Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
344dc8ed | 25 | * Use eth_random_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
6b8a66ee JP |
37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
38 | ||
1da177e4 LT |
39 | #define DRV_NAME "tun" |
40 | #define DRV_VERSION "1.6" | |
41 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
42 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/errno.h> | |
46 | #include <linux/kernel.h> | |
174cd4b1 | 47 | #include <linux/sched/signal.h> |
1da177e4 LT |
48 | #include <linux/major.h> |
49 | #include <linux/slab.h> | |
50 | #include <linux/poll.h> | |
51 | #include <linux/fcntl.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/skbuff.h> | |
54 | #include <linux/netdevice.h> | |
55 | #include <linux/etherdevice.h> | |
56 | #include <linux/miscdevice.h> | |
57 | #include <linux/ethtool.h> | |
58 | #include <linux/rtnetlink.h> | |
50857e2a | 59 | #include <linux/compat.h> |
1da177e4 LT |
60 | #include <linux/if.h> |
61 | #include <linux/if_arp.h> | |
62 | #include <linux/if_ether.h> | |
63 | #include <linux/if_tun.h> | |
6680ec68 | 64 | #include <linux/if_vlan.h> |
1da177e4 | 65 | #include <linux/crc32.h> |
d647a591 | 66 | #include <linux/nsproxy.h> |
f43798c2 | 67 | #include <linux/virtio_net.h> |
99405162 | 68 | #include <linux/rcupdate.h> |
881d966b | 69 | #include <net/net_namespace.h> |
79d17604 | 70 | #include <net/netns/generic.h> |
f019a7a5 | 71 | #include <net/rtnetlink.h> |
33dccbb0 | 72 | #include <net/sock.h> |
93e14b6d | 73 | #include <linux/seq_file.h> |
e0b46d0e | 74 | #include <linux/uio.h> |
1576d986 | 75 | #include <linux/skb_array.h> |
1da177e4 | 76 | |
7c0f6ba6 | 77 | #include <linux/uaccess.h> |
1da177e4 | 78 | |
14daa021 RR |
79 | /* Uncomment to enable debugging */ |
80 | /* #define TUN_DEBUG 1 */ | |
81 | ||
1da177e4 LT |
82 | #ifdef TUN_DEBUG |
83 | static int debug; | |
14daa021 | 84 | |
6b8a66ee JP |
85 | #define tun_debug(level, tun, fmt, args...) \ |
86 | do { \ | |
87 | if (tun->debug) \ | |
88 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
89 | } while (0) | |
90 | #define DBG1(level, fmt, args...) \ | |
91 | do { \ | |
92 | if (debug == 2) \ | |
93 | printk(level fmt, ##args); \ | |
94 | } while (0) | |
14daa021 | 95 | #else |
6b8a66ee JP |
96 | #define tun_debug(level, tun, fmt, args...) \ |
97 | do { \ | |
98 | if (0) \ | |
99 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
100 | } while (0) | |
101 | #define DBG1(level, fmt, args...) \ | |
102 | do { \ | |
103 | if (0) \ | |
104 | printk(level fmt, ##args); \ | |
105 | } while (0) | |
14daa021 RR |
106 | #endif |
107 | ||
66ccbc9c JW |
108 | #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
109 | ||
031f5e03 MT |
110 | /* TUN device flags */ |
111 | ||
112 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
113 | * overload it to mean fasync when stored there. | |
114 | */ | |
115 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
116 | /* High bits in flags field are unused. */ |
117 | #define TUN_VNET_LE 0x80000000 | |
8b8e658b | 118 | #define TUN_VNET_BE 0x40000000 |
031f5e03 MT |
119 | |
120 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
1cf8e410 | 121 | IFF_MULTI_QUEUE) |
0690899b MT |
122 | #define GOODCOPY_LEN 128 |
123 | ||
f271b2cc MK |
124 | #define FLT_EXACT_COUNT 8 |
125 | struct tap_filter { | |
126 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
127 | u32 mask[2]; /* Mask of the hashed addrs */ | |
128 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
129 | }; | |
130 | ||
baf71c5c PG |
131 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
132 | * to max number of VCPUs in guest. */ | |
133 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 134 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 135 | |
96442e42 JW |
136 | #define TUN_FLOW_EXPIRE (3 * HZ) |
137 | ||
608b9977 PA |
138 | struct tun_pcpu_stats { |
139 | u64 rx_packets; | |
140 | u64 rx_bytes; | |
141 | u64 tx_packets; | |
142 | u64 tx_bytes; | |
143 | struct u64_stats_sync syncp; | |
144 | u32 rx_dropped; | |
145 | u32 tx_dropped; | |
146 | u32 rx_frame_errors; | |
147 | }; | |
148 | ||
54f968d6 | 149 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 150 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
151 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
152 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 153 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 154 | * this). |
6e914fc7 JW |
155 | * |
156 | * RCU usage: | |
36fe8c09 | 157 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 158 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 159 | */ |
631ab46b | 160 | struct tun_file { |
54f968d6 JW |
161 | struct sock sk; |
162 | struct socket socket; | |
163 | struct socket_wq wq; | |
6e914fc7 | 164 | struct tun_struct __rcu *tun; |
54f968d6 JW |
165 | struct fasync_struct *fasync; |
166 | /* only used for fasnyc */ | |
167 | unsigned int flags; | |
fb7589a1 PE |
168 | union { |
169 | u16 queue_index; | |
170 | unsigned int ifindex; | |
171 | }; | |
4008e97f JW |
172 | struct list_head next; |
173 | struct tun_struct *detached; | |
1576d986 | 174 | struct skb_array tx_array; |
66ccbc9c | 175 | struct page_frag alloc_frag; |
631ab46b EB |
176 | }; |
177 | ||
96442e42 JW |
178 | struct tun_flow_entry { |
179 | struct hlist_node hash_link; | |
180 | struct rcu_head rcu; | |
181 | struct tun_struct *tun; | |
182 | ||
183 | u32 rxhash; | |
9bc88939 | 184 | u32 rps_rxhash; |
96442e42 JW |
185 | int queue_index; |
186 | unsigned long updated; | |
187 | }; | |
188 | ||
189 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
190 | ||
54f968d6 | 191 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 192 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
193 | * file were attached to a persist device. |
194 | */ | |
14daa021 | 195 | struct tun_struct { |
c8d68e6b JW |
196 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
197 | unsigned int numqueues; | |
f271b2cc | 198 | unsigned int flags; |
0625c883 EB |
199 | kuid_t owner; |
200 | kgid_t group; | |
14daa021 | 201 | |
14daa021 | 202 | struct net_device *dev; |
c8f44aff | 203 | netdev_features_t set_features; |
88255375 | 204 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
d591a1f3 | 205 | NETIF_F_TSO6) |
d9d52b51 | 206 | |
eaea34b2 | 207 | int align; |
d9d52b51 | 208 | int vnet_hdr_sz; |
54f968d6 JW |
209 | int sndbuf; |
210 | struct tap_filter txflt; | |
211 | struct sock_fprog fprog; | |
212 | /* protected by rtnl lock */ | |
213 | bool filter_attached; | |
14daa021 RR |
214 | #ifdef TUN_DEBUG |
215 | int debug; | |
1da177e4 | 216 | #endif |
96442e42 | 217 | spinlock_t lock; |
96442e42 JW |
218 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
219 | struct timer_list flow_gc_timer; | |
220 | unsigned long ageing_time; | |
4008e97f JW |
221 | unsigned int numdisabled; |
222 | struct list_head disabled; | |
5dbbaf2d | 223 | void *security; |
b8732fb7 | 224 | u32 flow_count; |
5503fcec | 225 | u32 rx_batched; |
608b9977 | 226 | struct tun_pcpu_stats __percpu *pcpu_stats; |
14daa021 | 227 | }; |
1da177e4 | 228 | |
8b8e658b GK |
229 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
230 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
231 | { | |
232 | return tun->flags & TUN_VNET_BE ? false : | |
233 | virtio_legacy_is_little_endian(); | |
234 | } | |
235 | ||
236 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
237 | { | |
238 | int be = !!(tun->flags & TUN_VNET_BE); | |
239 | ||
240 | if (put_user(be, argp)) | |
241 | return -EFAULT; | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
247 | { | |
248 | int be; | |
249 | ||
250 | if (get_user(be, argp)) | |
251 | return -EFAULT; | |
252 | ||
253 | if (be) | |
254 | tun->flags |= TUN_VNET_BE; | |
255 | else | |
256 | tun->flags &= ~TUN_VNET_BE; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | #else | |
261 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
262 | { | |
263 | return virtio_legacy_is_little_endian(); | |
264 | } | |
265 | ||
266 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
267 | { | |
268 | return -EINVAL; | |
269 | } | |
270 | ||
271 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
272 | { | |
273 | return -EINVAL; | |
274 | } | |
275 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
276 | ||
25bd55bb GK |
277 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
278 | { | |
7d824109 | 279 | return tun->flags & TUN_VNET_LE || |
8b8e658b | 280 | tun_legacy_is_little_endian(tun); |
25bd55bb GK |
281 | } |
282 | ||
56f0dcc5 MT |
283 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
284 | { | |
25bd55bb | 285 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
286 | } |
287 | ||
288 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
289 | { | |
25bd55bb | 290 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
291 | } |
292 | ||
96442e42 JW |
293 | static inline u32 tun_hashfn(u32 rxhash) |
294 | { | |
295 | return rxhash & 0x3ff; | |
296 | } | |
297 | ||
298 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
299 | { | |
300 | struct tun_flow_entry *e; | |
96442e42 | 301 | |
b67bfe0d | 302 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
303 | if (e->rxhash == rxhash) |
304 | return e; | |
305 | } | |
306 | return NULL; | |
307 | } | |
308 | ||
309 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
310 | struct hlist_head *head, | |
311 | u32 rxhash, u16 queue_index) | |
312 | { | |
9fdc6bef ED |
313 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
314 | ||
96442e42 JW |
315 | if (e) { |
316 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
317 | rxhash, queue_index); | |
318 | e->updated = jiffies; | |
319 | e->rxhash = rxhash; | |
9bc88939 | 320 | e->rps_rxhash = 0; |
96442e42 JW |
321 | e->queue_index = queue_index; |
322 | e->tun = tun; | |
323 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 324 | ++tun->flow_count; |
96442e42 JW |
325 | } |
326 | return e; | |
327 | } | |
328 | ||
96442e42 JW |
329 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
330 | { | |
331 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
332 | e->rxhash, e->queue_index); | |
333 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 334 | kfree_rcu(e, rcu); |
b8732fb7 | 335 | --tun->flow_count; |
96442e42 JW |
336 | } |
337 | ||
338 | static void tun_flow_flush(struct tun_struct *tun) | |
339 | { | |
340 | int i; | |
341 | ||
342 | spin_lock_bh(&tun->lock); | |
343 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
344 | struct tun_flow_entry *e; | |
b67bfe0d | 345 | struct hlist_node *n; |
96442e42 | 346 | |
b67bfe0d | 347 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
348 | tun_flow_delete(tun, e); |
349 | } | |
350 | spin_unlock_bh(&tun->lock); | |
351 | } | |
352 | ||
353 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
354 | { | |
355 | int i; | |
356 | ||
357 | spin_lock_bh(&tun->lock); | |
358 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
359 | struct tun_flow_entry *e; | |
b67bfe0d | 360 | struct hlist_node *n; |
96442e42 | 361 | |
b67bfe0d | 362 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
363 | if (e->queue_index == queue_index) |
364 | tun_flow_delete(tun, e); | |
365 | } | |
366 | } | |
367 | spin_unlock_bh(&tun->lock); | |
368 | } | |
369 | ||
370 | static void tun_flow_cleanup(unsigned long data) | |
371 | { | |
372 | struct tun_struct *tun = (struct tun_struct *)data; | |
373 | unsigned long delay = tun->ageing_time; | |
374 | unsigned long next_timer = jiffies + delay; | |
375 | unsigned long count = 0; | |
376 | int i; | |
377 | ||
378 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
379 | ||
380 | spin_lock_bh(&tun->lock); | |
381 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
382 | struct tun_flow_entry *e; | |
b67bfe0d | 383 | struct hlist_node *n; |
96442e42 | 384 | |
b67bfe0d | 385 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
386 | unsigned long this_timer; |
387 | count++; | |
388 | this_timer = e->updated + delay; | |
389 | if (time_before_eq(this_timer, jiffies)) | |
390 | tun_flow_delete(tun, e); | |
391 | else if (time_before(this_timer, next_timer)) | |
392 | next_timer = this_timer; | |
393 | } | |
394 | } | |
395 | ||
396 | if (count) | |
397 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
398 | spin_unlock_bh(&tun->lock); | |
399 | } | |
400 | ||
49974420 | 401 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 402 | struct tun_file *tfile) |
96442e42 JW |
403 | { |
404 | struct hlist_head *head; | |
405 | struct tun_flow_entry *e; | |
406 | unsigned long delay = tun->ageing_time; | |
9e85722d | 407 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
408 | |
409 | if (!rxhash) | |
410 | return; | |
411 | else | |
412 | head = &tun->flows[tun_hashfn(rxhash)]; | |
413 | ||
414 | rcu_read_lock(); | |
415 | ||
9e85722d JW |
416 | /* We may get a very small possibility of OOO during switching, not |
417 | * worth to optimize.*/ | |
418 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
419 | goto unlock; |
420 | ||
421 | e = tun_flow_find(head, rxhash); | |
422 | if (likely(e)) { | |
423 | /* TODO: keep queueing to old queue until it's empty? */ | |
424 | e->queue_index = queue_index; | |
425 | e->updated = jiffies; | |
9bc88939 | 426 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
427 | } else { |
428 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
429 | if (!tun_flow_find(head, rxhash) && |
430 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
431 | tun_flow_create(tun, head, rxhash, queue_index); |
432 | ||
433 | if (!timer_pending(&tun->flow_gc_timer)) | |
434 | mod_timer(&tun->flow_gc_timer, | |
435 | round_jiffies_up(jiffies + delay)); | |
436 | spin_unlock_bh(&tun->lock); | |
437 | } | |
438 | ||
439 | unlock: | |
440 | rcu_read_unlock(); | |
441 | } | |
442 | ||
9bc88939 TH |
443 | /** |
444 | * Save the hash received in the stack receive path and update the | |
445 | * flow_hash table accordingly. | |
446 | */ | |
447 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
448 | { | |
567e4b79 | 449 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 450 | e->rps_rxhash = hash; |
9bc88939 TH |
451 | } |
452 | ||
c8d68e6b | 453 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 454 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
455 | * the rxq based on the txq where the last packet of the flow comes. As |
456 | * the userspace application move between processors, we may get a | |
457 | * different rxq no. here. If we could not get rxhash, then we would | |
458 | * hope the rxq no. may help here. | |
459 | */ | |
f663dd9a | 460 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
99932d4f | 461 | void *accel_priv, select_queue_fallback_t fallback) |
c8d68e6b JW |
462 | { |
463 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 464 | struct tun_flow_entry *e; |
c8d68e6b JW |
465 | u32 txq = 0; |
466 | u32 numqueues = 0; | |
467 | ||
468 | rcu_read_lock(); | |
92bb73ea | 469 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 470 | |
feec084a | 471 | txq = __skb_get_hash_symmetric(skb); |
c8d68e6b | 472 | if (txq) { |
96442e42 | 473 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 474 | if (e) { |
9bc88939 | 475 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 476 | txq = e->queue_index; |
9bc88939 | 477 | } else |
96442e42 JW |
478 | /* use multiply and shift instead of expensive divide */ |
479 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
480 | } else if (likely(skb_rx_queue_recorded(skb))) { |
481 | txq = skb_get_rx_queue(skb); | |
482 | while (unlikely(txq >= numqueues)) | |
483 | txq -= numqueues; | |
484 | } | |
485 | ||
486 | rcu_read_unlock(); | |
487 | return txq; | |
488 | } | |
489 | ||
cde8b15f JW |
490 | static inline bool tun_not_capable(struct tun_struct *tun) |
491 | { | |
492 | const struct cred *cred = current_cred(); | |
c260b772 | 493 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
494 | |
495 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
496 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 497 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
498 | } |
499 | ||
c8d68e6b JW |
500 | static void tun_set_real_num_queues(struct tun_struct *tun) |
501 | { | |
502 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
503 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
504 | } | |
505 | ||
4008e97f JW |
506 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
507 | { | |
508 | tfile->detached = tun; | |
509 | list_add_tail(&tfile->next, &tun->disabled); | |
510 | ++tun->numdisabled; | |
511 | } | |
512 | ||
d32649d1 | 513 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
514 | { |
515 | struct tun_struct *tun = tfile->detached; | |
516 | ||
517 | tfile->detached = NULL; | |
518 | list_del_init(&tfile->next); | |
519 | --tun->numdisabled; | |
520 | return tun; | |
521 | } | |
522 | ||
4bfb0513 JW |
523 | static void tun_queue_purge(struct tun_file *tfile) |
524 | { | |
1576d986 JW |
525 | struct sk_buff *skb; |
526 | ||
527 | while ((skb = skb_array_consume(&tfile->tx_array)) != NULL) | |
528 | kfree_skb(skb); | |
529 | ||
5503fcec | 530 | skb_queue_purge(&tfile->sk.sk_write_queue); |
4bfb0513 JW |
531 | skb_queue_purge(&tfile->sk.sk_error_queue); |
532 | } | |
533 | ||
c8d68e6b JW |
534 | static void __tun_detach(struct tun_file *tfile, bool clean) |
535 | { | |
536 | struct tun_file *ntfile; | |
537 | struct tun_struct *tun; | |
c8d68e6b | 538 | |
b8deabd3 JW |
539 | tun = rtnl_dereference(tfile->tun); |
540 | ||
9e85722d | 541 | if (tun && !tfile->detached) { |
c8d68e6b JW |
542 | u16 index = tfile->queue_index; |
543 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
544 | |
545 | rcu_assign_pointer(tun->tfiles[index], | |
546 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 547 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
548 | ntfile->queue_index = index; |
549 | ||
550 | --tun->numqueues; | |
9e85722d | 551 | if (clean) { |
c956674b | 552 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 553 | sock_put(&tfile->sk); |
9e85722d | 554 | } else |
4008e97f | 555 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
556 | |
557 | synchronize_net(); | |
96442e42 | 558 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 559 | /* Drop read queue */ |
4bfb0513 | 560 | tun_queue_purge(tfile); |
c8d68e6b | 561 | tun_set_real_num_queues(tun); |
dd38bd85 | 562 | } else if (tfile->detached && clean) { |
4008e97f | 563 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
564 | sock_put(&tfile->sk); |
565 | } | |
c8d68e6b JW |
566 | |
567 | if (clean) { | |
af668b3c MT |
568 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
569 | netif_carrier_off(tun->dev); | |
570 | ||
40630b82 | 571 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 572 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 573 | unregister_netdevice(tun->dev); |
af668b3c | 574 | } |
1576d986 JW |
575 | if (tun) |
576 | skb_array_cleanup(&tfile->tx_array); | |
66ccbc9c JW |
577 | if (tfile->alloc_frag.page) |
578 | put_page(tfile->alloc_frag.page); | |
140e807d | 579 | sock_put(&tfile->sk); |
c8d68e6b JW |
580 | } |
581 | } | |
582 | ||
583 | static void tun_detach(struct tun_file *tfile, bool clean) | |
584 | { | |
585 | rtnl_lock(); | |
586 | __tun_detach(tfile, clean); | |
587 | rtnl_unlock(); | |
588 | } | |
589 | ||
590 | static void tun_detach_all(struct net_device *dev) | |
591 | { | |
592 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 593 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
594 | int i, n = tun->numqueues; |
595 | ||
596 | for (i = 0; i < n; i++) { | |
b8deabd3 | 597 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 598 | BUG_ON(!tfile); |
addf8fc4 | 599 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 600 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 601 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
602 | --tun->numqueues; |
603 | } | |
9e85722d | 604 | list_for_each_entry(tfile, &tun->disabled, next) { |
addf8fc4 | 605 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 606 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 607 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 608 | } |
c8d68e6b JW |
609 | BUG_ON(tun->numqueues != 0); |
610 | ||
611 | synchronize_net(); | |
612 | for (i = 0; i < n; i++) { | |
b8deabd3 | 613 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 614 | /* Drop read queue */ |
4bfb0513 | 615 | tun_queue_purge(tfile); |
c8d68e6b JW |
616 | sock_put(&tfile->sk); |
617 | } | |
4008e97f JW |
618 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
619 | tun_enable_queue(tfile); | |
4bfb0513 | 620 | tun_queue_purge(tfile); |
4008e97f JW |
621 | sock_put(&tfile->sk); |
622 | } | |
623 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 624 | |
40630b82 | 625 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 626 | module_put(THIS_MODULE); |
c8d68e6b JW |
627 | } |
628 | ||
849c9b6f | 629 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 630 | { |
631ab46b | 631 | struct tun_file *tfile = file->private_data; |
1576d986 | 632 | struct net_device *dev = tun->dev; |
38231b7a | 633 | int err; |
a7385ba2 | 634 | |
5dbbaf2d PM |
635 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
636 | if (err < 0) | |
637 | goto out; | |
638 | ||
38231b7a | 639 | err = -EINVAL; |
9e85722d | 640 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
641 | goto out; |
642 | ||
643 | err = -EBUSY; | |
40630b82 | 644 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
645 | goto out; |
646 | ||
647 | err = -E2BIG; | |
4008e97f JW |
648 | if (!tfile->detached && |
649 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
650 | goto out; |
651 | ||
652 | err = 0; | |
54f968d6 | 653 | |
92d4ea6e | 654 | /* Re-attach the filter to persist device */ |
849c9b6f | 655 | if (!skip_filter && (tun->filter_attached == true)) { |
8ced425e HFS |
656 | lock_sock(tfile->socket.sk); |
657 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
658 | release_sock(tfile->socket.sk); | |
54f968d6 JW |
659 | if (!err) |
660 | goto out; | |
661 | } | |
1576d986 JW |
662 | |
663 | if (!tfile->detached && | |
664 | skb_array_init(&tfile->tx_array, dev->tx_queue_len, GFP_KERNEL)) { | |
665 | err = -ENOMEM; | |
666 | goto out; | |
667 | } | |
668 | ||
c8d68e6b | 669 | tfile->queue_index = tun->numqueues; |
addf8fc4 | 670 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
6e914fc7 | 671 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 672 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 673 | tun->numqueues++; |
a7385ba2 | 674 | |
4008e97f JW |
675 | if (tfile->detached) |
676 | tun_enable_queue(tfile); | |
677 | else | |
678 | sock_hold(&tfile->sk); | |
679 | ||
c8d68e6b | 680 | tun_set_real_num_queues(tun); |
a7385ba2 | 681 | |
c8d68e6b JW |
682 | /* device is allowed to go away first, so no need to hold extra |
683 | * refcnt. | |
684 | */ | |
685 | ||
686 | out: | |
687 | return err; | |
631ab46b EB |
688 | } |
689 | ||
690 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
691 | { | |
6e914fc7 | 692 | struct tun_struct *tun; |
c70f1829 | 693 | |
6e914fc7 JW |
694 | rcu_read_lock(); |
695 | tun = rcu_dereference(tfile->tun); | |
696 | if (tun) | |
697 | dev_hold(tun->dev); | |
698 | rcu_read_unlock(); | |
c70f1829 EB |
699 | |
700 | return tun; | |
631ab46b EB |
701 | } |
702 | ||
703 | static struct tun_struct *tun_get(struct file *file) | |
704 | { | |
705 | return __tun_get(file->private_data); | |
706 | } | |
707 | ||
708 | static void tun_put(struct tun_struct *tun) | |
709 | { | |
6e914fc7 | 710 | dev_put(tun->dev); |
631ab46b EB |
711 | } |
712 | ||
6b8a66ee | 713 | /* TAP filtering */ |
f271b2cc MK |
714 | static void addr_hash_set(u32 *mask, const u8 *addr) |
715 | { | |
716 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
717 | mask[n >> 5] |= (1 << (n & 31)); | |
718 | } | |
719 | ||
720 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
721 | { | |
722 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
723 | return mask[n >> 5] & (1 << (n & 31)); | |
724 | } | |
725 | ||
726 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
727 | { | |
728 | struct { u8 u[ETH_ALEN]; } *addr; | |
729 | struct tun_filter uf; | |
730 | int err, alen, n, nexact; | |
731 | ||
732 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
733 | return -EFAULT; | |
734 | ||
735 | if (!uf.count) { | |
736 | /* Disabled */ | |
737 | filter->count = 0; | |
738 | return 0; | |
739 | } | |
740 | ||
741 | alen = ETH_ALEN * uf.count; | |
28e8190d ME |
742 | addr = memdup_user(arg + sizeof(uf), alen); |
743 | if (IS_ERR(addr)) | |
744 | return PTR_ERR(addr); | |
f271b2cc MK |
745 | |
746 | /* The filter is updated without holding any locks. Which is | |
747 | * perfectly safe. We disable it first and in the worst | |
748 | * case we'll accept a few undesired packets. */ | |
749 | filter->count = 0; | |
750 | wmb(); | |
751 | ||
752 | /* Use first set of addresses as an exact filter */ | |
753 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
754 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
755 | ||
756 | nexact = n; | |
757 | ||
cfbf84fc AW |
758 | /* Remaining multicast addresses are hashed, |
759 | * unicast will leave the filter disabled. */ | |
f271b2cc | 760 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
761 | for (; n < uf.count; n++) { |
762 | if (!is_multicast_ether_addr(addr[n].u)) { | |
763 | err = 0; /* no filter */ | |
3b8d2a69 | 764 | goto free_addr; |
cfbf84fc | 765 | } |
f271b2cc | 766 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 767 | } |
f271b2cc MK |
768 | |
769 | /* For ALLMULTI just set the mask to all ones. | |
770 | * This overrides the mask populated above. */ | |
771 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
772 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
773 | ||
774 | /* Now enable the filter */ | |
775 | wmb(); | |
776 | filter->count = nexact; | |
777 | ||
778 | /* Return the number of exact filters */ | |
779 | err = nexact; | |
3b8d2a69 | 780 | free_addr: |
f271b2cc MK |
781 | kfree(addr); |
782 | return err; | |
783 | } | |
784 | ||
785 | /* Returns: 0 - drop, !=0 - accept */ | |
786 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
787 | { | |
788 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
789 | * at this point. */ | |
790 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
791 | int i; | |
792 | ||
793 | /* Exact match */ | |
794 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 795 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
796 | return 1; |
797 | ||
798 | /* Inexact match (multicast only) */ | |
799 | if (is_multicast_ether_addr(eh->h_dest)) | |
800 | return addr_hash_test(filter->mask, eh->h_dest); | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Checks whether the packet is accepted or not. | |
807 | * Returns: 0 - drop, !=0 - accept | |
808 | */ | |
809 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
810 | { | |
811 | if (!filter->count) | |
812 | return 1; | |
813 | ||
814 | return run_filter(filter, skb); | |
815 | } | |
816 | ||
1da177e4 LT |
817 | /* Network device part of the driver */ |
818 | ||
7282d491 | 819 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 820 | |
c70f1829 EB |
821 | /* Net device detach from fd. */ |
822 | static void tun_net_uninit(struct net_device *dev) | |
823 | { | |
c8d68e6b | 824 | tun_detach_all(dev); |
c70f1829 EB |
825 | } |
826 | ||
1da177e4 LT |
827 | /* Net device open. */ |
828 | static int tun_net_open(struct net_device *dev) | |
829 | { | |
b20e2d54 HFS |
830 | struct tun_struct *tun = netdev_priv(dev); |
831 | int i; | |
832 | ||
c8d68e6b | 833 | netif_tx_start_all_queues(dev); |
b20e2d54 HFS |
834 | |
835 | for (i = 0; i < tun->numqueues; i++) { | |
836 | struct tun_file *tfile; | |
837 | ||
838 | tfile = rtnl_dereference(tun->tfiles[i]); | |
839 | tfile->socket.sk->sk_write_space(tfile->socket.sk); | |
840 | } | |
841 | ||
1da177e4 LT |
842 | return 0; |
843 | } | |
844 | ||
845 | /* Net device close. */ | |
846 | static int tun_net_close(struct net_device *dev) | |
847 | { | |
c8d68e6b | 848 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
849 | return 0; |
850 | } | |
851 | ||
852 | /* Net device start xmit */ | |
424efe9c | 853 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
854 | { |
855 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 856 | int txq = skb->queue_mapping; |
6e914fc7 | 857 | struct tun_file *tfile; |
fa35864e | 858 | u32 numqueues = 0; |
1da177e4 | 859 | |
6e914fc7 | 860 | rcu_read_lock(); |
c8d68e6b | 861 | tfile = rcu_dereference(tun->tfiles[txq]); |
fa35864e | 862 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 863 | |
1da177e4 | 864 | /* Drop packet if interface is not attached */ |
fa35864e | 865 | if (txq >= numqueues) |
1da177e4 LT |
866 | goto drop; |
867 | ||
3df97ba8 JW |
868 | #ifdef CONFIG_RPS |
869 | if (numqueues == 1 && static_key_false(&rps_needed)) { | |
9bc88939 TH |
870 | /* Select queue was not called for the skbuff, so we extract the |
871 | * RPS hash and save it into the flow_table here. | |
872 | */ | |
873 | __u32 rxhash; | |
874 | ||
feec084a | 875 | rxhash = __skb_get_hash_symmetric(skb); |
9bc88939 TH |
876 | if (rxhash) { |
877 | struct tun_flow_entry *e; | |
878 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
879 | rxhash); | |
880 | if (e) | |
881 | tun_flow_save_rps_rxhash(e, rxhash); | |
882 | } | |
883 | } | |
3df97ba8 | 884 | #endif |
9bc88939 | 885 | |
6e914fc7 JW |
886 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
887 | ||
c8d68e6b JW |
888 | BUG_ON(!tfile); |
889 | ||
f271b2cc MK |
890 | /* Drop if the filter does not like it. |
891 | * This is a noop if the filter is disabled. | |
892 | * Filter can be enabled only for the TAP devices. */ | |
893 | if (!check_filter(&tun->txflt, skb)) | |
894 | goto drop; | |
895 | ||
54f968d6 JW |
896 | if (tfile->socket.sk->sk_filter && |
897 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
898 | goto drop; |
899 | ||
1f8b977a | 900 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
7bf66305 JW |
901 | goto drop; |
902 | ||
7b996243 | 903 | skb_tx_timestamp(skb); |
eda29772 | 904 | |
0110d6f2 | 905 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
906 | * for indefinite time. |
907 | */ | |
0110d6f2 MT |
908 | skb_orphan(skb); |
909 | ||
f8af75f3 ED |
910 | nf_reset(skb); |
911 | ||
1576d986 JW |
912 | if (skb_array_produce(&tfile->tx_array, skb)) |
913 | goto drop; | |
1da177e4 LT |
914 | |
915 | /* Notify and wake up reader process */ | |
54f968d6 JW |
916 | if (tfile->flags & TUN_FASYNC) |
917 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 918 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
919 | |
920 | rcu_read_unlock(); | |
6ed10654 | 921 | return NETDEV_TX_OK; |
1da177e4 LT |
922 | |
923 | drop: | |
608b9977 | 924 | this_cpu_inc(tun->pcpu_stats->tx_dropped); |
149d36f7 | 925 | skb_tx_error(skb); |
1da177e4 | 926 | kfree_skb(skb); |
6e914fc7 | 927 | rcu_read_unlock(); |
baeababb | 928 | return NET_XMIT_DROP; |
1da177e4 LT |
929 | } |
930 | ||
f271b2cc | 931 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 932 | { |
f271b2cc MK |
933 | /* |
934 | * This callback is supposed to deal with mc filter in | |
935 | * _rx_ path and has nothing to do with the _tx_ path. | |
936 | * In rx path we always accept everything userspace gives us. | |
937 | */ | |
1da177e4 LT |
938 | } |
939 | ||
c8f44aff MM |
940 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
941 | netdev_features_t features) | |
88255375 MM |
942 | { |
943 | struct tun_struct *tun = netdev_priv(dev); | |
944 | ||
945 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
946 | } | |
bebd097a NH |
947 | #ifdef CONFIG_NET_POLL_CONTROLLER |
948 | static void tun_poll_controller(struct net_device *dev) | |
949 | { | |
950 | /* | |
951 | * Tun only receives frames when: | |
952 | * 1) the char device endpoint gets data from user space | |
953 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 954 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 955 | * never to have pending data when we poll for it |
92d4ea6e | 956 | * so there is nothing to do here but return. |
bebd097a NH |
957 | * We need this though so netpoll recognizes us as an interface that |
958 | * supports polling, which enables bridge devices in virt setups to | |
959 | * still use netconsole | |
960 | */ | |
961 | return; | |
962 | } | |
963 | #endif | |
eaea34b2 PA |
964 | |
965 | static void tun_set_headroom(struct net_device *dev, int new_hr) | |
966 | { | |
967 | struct tun_struct *tun = netdev_priv(dev); | |
968 | ||
969 | if (new_hr < NET_SKB_PAD) | |
970 | new_hr = NET_SKB_PAD; | |
971 | ||
972 | tun->align = new_hr; | |
973 | } | |
974 | ||
bc1f4470 | 975 | static void |
608b9977 PA |
976 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
977 | { | |
978 | u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; | |
979 | struct tun_struct *tun = netdev_priv(dev); | |
980 | struct tun_pcpu_stats *p; | |
981 | int i; | |
982 | ||
983 | for_each_possible_cpu(i) { | |
984 | u64 rxpackets, rxbytes, txpackets, txbytes; | |
985 | unsigned int start; | |
986 | ||
987 | p = per_cpu_ptr(tun->pcpu_stats, i); | |
988 | do { | |
989 | start = u64_stats_fetch_begin(&p->syncp); | |
990 | rxpackets = p->rx_packets; | |
991 | rxbytes = p->rx_bytes; | |
992 | txpackets = p->tx_packets; | |
993 | txbytes = p->tx_bytes; | |
994 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
995 | ||
996 | stats->rx_packets += rxpackets; | |
997 | stats->rx_bytes += rxbytes; | |
998 | stats->tx_packets += txpackets; | |
999 | stats->tx_bytes += txbytes; | |
1000 | ||
1001 | /* u32 counters */ | |
1002 | rx_dropped += p->rx_dropped; | |
1003 | rx_frame_errors += p->rx_frame_errors; | |
1004 | tx_dropped += p->tx_dropped; | |
1005 | } | |
1006 | stats->rx_dropped = rx_dropped; | |
1007 | stats->rx_frame_errors = rx_frame_errors; | |
1008 | stats->tx_dropped = tx_dropped; | |
608b9977 PA |
1009 | } |
1010 | ||
758e43b7 | 1011 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 1012 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1013 | .ndo_open = tun_net_open, |
1014 | .ndo_stop = tun_net_close, | |
00829823 | 1015 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1016 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 1017 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1018 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1019 | .ndo_poll_controller = tun_poll_controller, | |
1020 | #endif | |
eaea34b2 | 1021 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1022 | .ndo_get_stats64 = tun_net_get_stats64, |
758e43b7 SH |
1023 | }; |
1024 | ||
1025 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 1026 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1027 | .ndo_open = tun_net_open, |
1028 | .ndo_stop = tun_net_close, | |
00829823 | 1029 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1030 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 1031 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
1032 | .ndo_set_mac_address = eth_mac_addr, |
1033 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 1034 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1035 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1036 | .ndo_poll_controller = tun_poll_controller, | |
1037 | #endif | |
5e52796a | 1038 | .ndo_features_check = passthru_features_check, |
eaea34b2 | 1039 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1040 | .ndo_get_stats64 = tun_net_get_stats64, |
758e43b7 SH |
1041 | }; |
1042 | ||
944a1376 | 1043 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
1044 | { |
1045 | int i; | |
1046 | ||
96442e42 JW |
1047 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
1048 | INIT_HLIST_HEAD(&tun->flows[i]); | |
1049 | ||
1050 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
1051 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
1052 | mod_timer(&tun->flow_gc_timer, | |
1053 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
1054 | } |
1055 | ||
1056 | static void tun_flow_uninit(struct tun_struct *tun) | |
1057 | { | |
1058 | del_timer_sync(&tun->flow_gc_timer); | |
1059 | tun_flow_flush(tun); | |
96442e42 JW |
1060 | } |
1061 | ||
91572088 JW |
1062 | #define MIN_MTU 68 |
1063 | #define MAX_MTU 65535 | |
1064 | ||
1da177e4 LT |
1065 | /* Initialize net device. */ |
1066 | static void tun_net_init(struct net_device *dev) | |
1067 | { | |
1068 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 1069 | |
1da177e4 | 1070 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 1071 | case IFF_TUN: |
758e43b7 SH |
1072 | dev->netdev_ops = &tun_netdev_ops; |
1073 | ||
1da177e4 LT |
1074 | /* Point-to-Point TUN Device */ |
1075 | dev->hard_header_len = 0; | |
1076 | dev->addr_len = 0; | |
1077 | dev->mtu = 1500; | |
1078 | ||
1079 | /* Zero header length */ | |
6aa20a22 | 1080 | dev->type = ARPHRD_NONE; |
1da177e4 | 1081 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
1da177e4 LT |
1082 | break; |
1083 | ||
40630b82 | 1084 | case IFF_TAP: |
7a0a9608 | 1085 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 1086 | /* Ethernet TAP Device */ |
1da177e4 | 1087 | ether_setup(dev); |
550fd08c | 1088 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 1089 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 1090 | |
f2cedb63 | 1091 | eth_hw_addr_random(dev); |
36226a8d | 1092 | |
1da177e4 LT |
1093 | break; |
1094 | } | |
91572088 JW |
1095 | |
1096 | dev->min_mtu = MIN_MTU; | |
1097 | dev->max_mtu = MAX_MTU - dev->hard_header_len; | |
1da177e4 LT |
1098 | } |
1099 | ||
1100 | /* Character device part */ | |
1101 | ||
1102 | /* Poll */ | |
c8d68e6b | 1103 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 1104 | { |
b2430de3 EB |
1105 | struct tun_file *tfile = file->private_data; |
1106 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 1107 | struct sock *sk; |
33dccbb0 | 1108 | unsigned int mask = 0; |
1da177e4 LT |
1109 | |
1110 | if (!tun) | |
eac9e902 | 1111 | return POLLERR; |
1da177e4 | 1112 | |
54f968d6 | 1113 | sk = tfile->socket.sk; |
3c8a9c63 | 1114 | |
6b8a66ee | 1115 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 1116 | |
9e641bdc | 1117 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 1118 | |
1576d986 | 1119 | if (!skb_array_empty(&tfile->tx_array)) |
1da177e4 LT |
1120 | mask |= POLLIN | POLLRDNORM; |
1121 | ||
b20e2d54 HFS |
1122 | if (tun->dev->flags & IFF_UP && |
1123 | (sock_writeable(sk) || | |
1124 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
1125 | sock_writeable(sk)))) | |
33dccbb0 HX |
1126 | mask |= POLLOUT | POLLWRNORM; |
1127 | ||
c70f1829 EB |
1128 | if (tun->dev->reg_state != NETREG_REGISTERED) |
1129 | mask = POLLERR; | |
1130 | ||
631ab46b | 1131 | tun_put(tun); |
1da177e4 LT |
1132 | return mask; |
1133 | } | |
1134 | ||
f42157cb RR |
1135 | /* prepad is the amount to reserve at front. len is length after that. |
1136 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1137 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1138 | size_t prepad, size_t len, |
1139 | size_t linear, int noblock) | |
f42157cb | 1140 | { |
54f968d6 | 1141 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1142 | struct sk_buff *skb; |
33dccbb0 | 1143 | int err; |
f42157cb RR |
1144 | |
1145 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1146 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1147 | linear = len; |
f42157cb | 1148 | |
33dccbb0 | 1149 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1150 | &err, 0); |
f42157cb | 1151 | if (!skb) |
33dccbb0 | 1152 | return ERR_PTR(err); |
f42157cb RR |
1153 | |
1154 | skb_reserve(skb, prepad); | |
1155 | skb_put(skb, linear); | |
33dccbb0 HX |
1156 | skb->data_len = len - linear; |
1157 | skb->len += len - linear; | |
f42157cb RR |
1158 | |
1159 | return skb; | |
1160 | } | |
1161 | ||
5503fcec JW |
1162 | static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile, |
1163 | struct sk_buff *skb, int more) | |
1164 | { | |
1165 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
1166 | struct sk_buff_head process_queue; | |
1167 | u32 rx_batched = tun->rx_batched; | |
1168 | bool rcv = false; | |
1169 | ||
1170 | if (!rx_batched || (!more && skb_queue_empty(queue))) { | |
1171 | local_bh_disable(); | |
1172 | netif_receive_skb(skb); | |
1173 | local_bh_enable(); | |
1174 | return; | |
1175 | } | |
1176 | ||
1177 | spin_lock(&queue->lock); | |
1178 | if (!more || skb_queue_len(queue) == rx_batched) { | |
1179 | __skb_queue_head_init(&process_queue); | |
1180 | skb_queue_splice_tail_init(queue, &process_queue); | |
1181 | rcv = true; | |
1182 | } else { | |
1183 | __skb_queue_tail(queue, skb); | |
1184 | } | |
1185 | spin_unlock(&queue->lock); | |
1186 | ||
1187 | if (rcv) { | |
1188 | struct sk_buff *nskb; | |
1189 | ||
1190 | local_bh_disable(); | |
1191 | while ((nskb = __skb_dequeue(&process_queue))) | |
1192 | netif_receive_skb(nskb); | |
1193 | netif_receive_skb(skb); | |
1194 | local_bh_enable(); | |
1195 | } | |
1196 | } | |
1197 | ||
66ccbc9c JW |
1198 | static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, |
1199 | int len, int noblock, bool zerocopy) | |
1200 | { | |
1201 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) | |
1202 | return false; | |
1203 | ||
1204 | if (tfile->socket.sk->sk_sndbuf != INT_MAX) | |
1205 | return false; | |
1206 | ||
1207 | if (!noblock) | |
1208 | return false; | |
1209 | ||
1210 | if (zerocopy) | |
1211 | return false; | |
1212 | ||
1213 | if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + | |
1214 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
1215 | return false; | |
1216 | ||
1217 | return true; | |
1218 | } | |
1219 | ||
1220 | static struct sk_buff *tun_build_skb(struct tun_file *tfile, | |
1221 | struct iov_iter *from, | |
1222 | int len) | |
1223 | { | |
1224 | struct page_frag *alloc_frag = &tfile->alloc_frag; | |
1225 | struct sk_buff *skb; | |
1226 | int buflen = SKB_DATA_ALIGN(len + TUN_RX_PAD) + | |
1227 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1228 | char *buf; | |
1229 | size_t copied; | |
1230 | ||
1231 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) | |
1232 | return ERR_PTR(-ENOMEM); | |
1233 | ||
1234 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
1235 | copied = copy_page_from_iter(alloc_frag->page, | |
1236 | alloc_frag->offset + TUN_RX_PAD, | |
1237 | len, from); | |
1238 | if (copied != len) | |
1239 | return ERR_PTR(-EFAULT); | |
1240 | ||
1241 | skb = build_skb(buf, buflen); | |
1242 | if (!skb) | |
1243 | return ERR_PTR(-ENOMEM); | |
1244 | ||
1245 | skb_reserve(skb, TUN_RX_PAD); | |
1246 | skb_put(skb, len); | |
1247 | get_page(alloc_frag->page); | |
1248 | alloc_frag->offset += buflen; | |
1249 | ||
1250 | return skb; | |
1251 | } | |
1252 | ||
1da177e4 | 1253 | /* Get packet from user space buffer */ |
54f968d6 | 1254 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 | 1255 | void *msg_control, struct iov_iter *from, |
5503fcec | 1256 | int noblock, bool more) |
1da177e4 | 1257 | { |
09640e63 | 1258 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1259 | struct sk_buff *skb; |
f5ff53b4 | 1260 | size_t total_len = iov_iter_count(from); |
eaea34b2 | 1261 | size_t len = total_len, align = tun->align, linear; |
f43798c2 | 1262 | struct virtio_net_hdr gso = { 0 }; |
608b9977 | 1263 | struct tun_pcpu_stats *stats; |
96f8d9ec | 1264 | int good_linear; |
0690899b MT |
1265 | int copylen; |
1266 | bool zerocopy = false; | |
1267 | int err; | |
49974420 | 1268 | u32 rxhash; |
1da177e4 | 1269 | |
1bd4978a ED |
1270 | if (!(tun->dev->flags & IFF_UP)) |
1271 | return -EIO; | |
1272 | ||
40630b82 | 1273 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1274 | if (len < sizeof(pi)) |
1da177e4 | 1275 | return -EINVAL; |
15718ea0 | 1276 | len -= sizeof(pi); |
1da177e4 | 1277 | |
cbbd26b8 | 1278 | if (!copy_from_iter_full(&pi, sizeof(pi), from)) |
1da177e4 LT |
1279 | return -EFAULT; |
1280 | } | |
1281 | ||
40630b82 | 1282 | if (tun->flags & IFF_VNET_HDR) { |
e1edab87 WB |
1283 | int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1284 | ||
1285 | if (len < vnet_hdr_sz) | |
f43798c2 | 1286 | return -EINVAL; |
e1edab87 | 1287 | len -= vnet_hdr_sz; |
f43798c2 | 1288 | |
cbbd26b8 | 1289 | if (!copy_from_iter_full(&gso, sizeof(gso), from)) |
f43798c2 RR |
1290 | return -EFAULT; |
1291 | ||
4909122f | 1292 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1293 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1294 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1295 | |
56f0dcc5 | 1296 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1297 | return -EINVAL; |
e1edab87 | 1298 | iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1299 | } |
1300 | ||
40630b82 | 1301 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1302 | align += NET_IP_ALIGN; |
0eca93bc | 1303 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1304 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1305 | return -EINVAL; |
1306 | } | |
6aa20a22 | 1307 | |
96f8d9ec JW |
1308 | good_linear = SKB_MAX_HEAD(align); |
1309 | ||
88529176 | 1310 | if (msg_control) { |
f5ff53b4 AV |
1311 | struct iov_iter i = *from; |
1312 | ||
88529176 JW |
1313 | /* There are 256 bytes to be copied in skb, so there is |
1314 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1315 | * The rest of the buffer is mapped from userspace. |
1316 | */ | |
56f0dcc5 | 1317 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1318 | if (copylen > good_linear) |
1319 | copylen = good_linear; | |
3dd5c330 | 1320 | linear = copylen; |
f5ff53b4 AV |
1321 | iov_iter_advance(&i, copylen); |
1322 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1323 | zerocopy = true; |
1324 | } | |
1325 | ||
66ccbc9c JW |
1326 | if (tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) { |
1327 | skb = tun_build_skb(tfile, from, len); | |
1328 | if (IS_ERR(skb)) { | |
608b9977 | 1329 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
66ccbc9c JW |
1330 | return PTR_ERR(skb); |
1331 | } | |
1332 | } else { | |
1333 | if (!zerocopy) { | |
1334 | copylen = len; | |
1335 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) | |
1336 | linear = good_linear; | |
1337 | else | |
1338 | linear = tun16_to_cpu(tun, gso.hdr_len); | |
1339 | } | |
1da177e4 | 1340 | |
66ccbc9c JW |
1341 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
1342 | if (IS_ERR(skb)) { | |
1343 | if (PTR_ERR(skb) != -EAGAIN) | |
1344 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1345 | return PTR_ERR(skb); | |
1346 | } | |
0690899b | 1347 | |
66ccbc9c JW |
1348 | if (zerocopy) |
1349 | err = zerocopy_sg_from_iter(skb, from); | |
1350 | else | |
1351 | err = skb_copy_datagram_from_iter(skb, 0, from, len); | |
1352 | ||
1353 | if (err) { | |
1354 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1355 | kfree_skb(skb); | |
1356 | return -EFAULT; | |
1357 | } | |
8f22757e | 1358 | } |
1da177e4 | 1359 | |
3e9e40e7 | 1360 | if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { |
df10db98 PA |
1361 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); |
1362 | kfree_skb(skb); | |
1363 | return -EINVAL; | |
1364 | } | |
1365 | ||
1da177e4 | 1366 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1367 | case IFF_TUN: |
1368 | if (tun->flags & IFF_NO_PI) { | |
f09f7ee2 AWC |
1369 | switch (skb->data[0] & 0xf0) { |
1370 | case 0x40: | |
1371 | pi.proto = htons(ETH_P_IP); | |
1372 | break; | |
1373 | case 0x60: | |
1374 | pi.proto = htons(ETH_P_IPV6); | |
1375 | break; | |
1376 | default: | |
608b9977 | 1377 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
f09f7ee2 AWC |
1378 | kfree_skb(skb); |
1379 | return -EINVAL; | |
1380 | } | |
1381 | } | |
1382 | ||
459a98ed | 1383 | skb_reset_mac_header(skb); |
1da177e4 | 1384 | skb->protocol = pi.proto; |
4c13eb66 | 1385 | skb->dev = tun->dev; |
1da177e4 | 1386 | break; |
40630b82 | 1387 | case IFF_TAP: |
1da177e4 LT |
1388 | skb->protocol = eth_type_trans(skb, tun->dev); |
1389 | break; | |
6403eab1 | 1390 | } |
1da177e4 | 1391 | |
0690899b MT |
1392 | /* copy skb_ubuf_info for callback when skb has no error */ |
1393 | if (zerocopy) { | |
1394 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1395 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1396 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
af1cc7a2 JW |
1397 | } else if (msg_control) { |
1398 | struct ubuf_info *uarg = msg_control; | |
1399 | uarg->callback(uarg, false); | |
0690899b MT |
1400 | } |
1401 | ||
72f65107 | 1402 | skb_reset_network_header(skb); |
40893fd0 | 1403 | skb_probe_transport_header(skb, 0); |
38502af7 | 1404 | |
feec084a | 1405 | rxhash = __skb_get_hash_symmetric(skb); |
d4aea20d | 1406 | #ifndef CONFIG_4KSTACKS |
5503fcec | 1407 | tun_rx_batched(tun, tfile, skb, more); |
d4aea20d | 1408 | #else |
1da177e4 | 1409 | netif_rx_ni(skb); |
d4aea20d | 1410 | #endif |
6aa20a22 | 1411 | |
608b9977 PA |
1412 | stats = get_cpu_ptr(tun->pcpu_stats); |
1413 | u64_stats_update_begin(&stats->syncp); | |
1414 | stats->rx_packets++; | |
1415 | stats->rx_bytes += len; | |
1416 | u64_stats_update_end(&stats->syncp); | |
1417 | put_cpu_ptr(stats); | |
1da177e4 | 1418 | |
9e85722d | 1419 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1420 | return total_len; |
6aa20a22 | 1421 | } |
1da177e4 | 1422 | |
f5ff53b4 | 1423 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 1424 | { |
33dccbb0 | 1425 | struct file *file = iocb->ki_filp; |
ab46d779 | 1426 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1427 | struct tun_file *tfile = file->private_data; |
631ab46b | 1428 | ssize_t result; |
1da177e4 LT |
1429 | |
1430 | if (!tun) | |
1431 | return -EBADFD; | |
1432 | ||
5503fcec JW |
1433 | result = tun_get_user(tun, tfile, NULL, from, |
1434 | file->f_flags & O_NONBLOCK, false); | |
631ab46b EB |
1435 | |
1436 | tun_put(tun); | |
1437 | return result; | |
1da177e4 LT |
1438 | } |
1439 | ||
1da177e4 | 1440 | /* Put packet to the user space buffer */ |
6f7c156c | 1441 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1442 | struct tun_file *tfile, |
6f7c156c | 1443 | struct sk_buff *skb, |
e0b46d0e | 1444 | struct iov_iter *iter) |
1da177e4 LT |
1445 | { |
1446 | struct tun_pi pi = { 0, skb->protocol }; | |
608b9977 | 1447 | struct tun_pcpu_stats *stats; |
e0b46d0e | 1448 | ssize_t total; |
8c847d25 | 1449 | int vlan_offset = 0; |
a8f9bfdf | 1450 | int vlan_hlen = 0; |
2eb783c4 | 1451 | int vnet_hdr_sz = 0; |
a8f9bfdf | 1452 | |
df8a39de | 1453 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 1454 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 1455 | |
40630b82 | 1456 | if (tun->flags & IFF_VNET_HDR) |
e1edab87 | 1457 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1da177e4 | 1458 | |
e0b46d0e HX |
1459 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
1460 | ||
40630b82 | 1461 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 1462 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
1463 | return -EINVAL; |
1464 | ||
e0b46d0e HX |
1465 | total += sizeof(pi); |
1466 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
1467 | /* Packet will be striped */ |
1468 | pi.flags |= TUN_PKT_STRIP; | |
1469 | } | |
6aa20a22 | 1470 | |
e0b46d0e | 1471 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 1472 | return -EFAULT; |
6aa20a22 | 1473 | } |
1da177e4 | 1474 | |
2eb783c4 | 1475 | if (vnet_hdr_sz) { |
9403cd7c | 1476 | struct virtio_net_hdr gso; |
34166093 | 1477 | |
e0b46d0e | 1478 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
1479 | return -EINVAL; |
1480 | ||
3e9e40e7 | 1481 | if (virtio_net_hdr_from_skb(skb, &gso, |
6391a448 | 1482 | tun_is_little_endian(tun), true)) { |
f43798c2 | 1483 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
34166093 MR |
1484 | pr_err("unexpected GSO type: " |
1485 | "0x%x, gso_size %d, hdr_len %d\n", | |
1486 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), | |
1487 | tun16_to_cpu(tun, gso.hdr_len)); | |
1488 | print_hex_dump(KERN_ERR, "tun: ", | |
1489 | DUMP_PREFIX_NONE, | |
1490 | 16, 1, skb->head, | |
1491 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); | |
1492 | WARN_ON_ONCE(1); | |
1493 | return -EINVAL; | |
1494 | } | |
f43798c2 | 1495 | |
e0b46d0e | 1496 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 1497 | return -EFAULT; |
8c847d25 JW |
1498 | |
1499 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
1500 | } |
1501 | ||
a8f9bfdf | 1502 | if (vlan_hlen) { |
e0b46d0e | 1503 | int ret; |
6680ec68 JW |
1504 | struct { |
1505 | __be16 h_vlan_proto; | |
1506 | __be16 h_vlan_TCI; | |
1507 | } veth; | |
1508 | ||
1509 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 1510 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
1511 | |
1512 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 1513 | |
e0b46d0e HX |
1514 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
1515 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
1516 | goto done; |
1517 | ||
e0b46d0e HX |
1518 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
1519 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
1520 | goto done; |
1521 | } | |
1da177e4 | 1522 | |
e0b46d0e | 1523 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 1524 | |
6680ec68 | 1525 | done: |
608b9977 PA |
1526 | /* caller is in process context, */ |
1527 | stats = get_cpu_ptr(tun->pcpu_stats); | |
1528 | u64_stats_update_begin(&stats->syncp); | |
1529 | stats->tx_packets++; | |
1530 | stats->tx_bytes += skb->len + vlan_hlen; | |
1531 | u64_stats_update_end(&stats->syncp); | |
1532 | put_cpu_ptr(tun->pcpu_stats); | |
1da177e4 LT |
1533 | |
1534 | return total; | |
1535 | } | |
1536 | ||
1576d986 JW |
1537 | static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock, |
1538 | int *err) | |
1539 | { | |
1540 | DECLARE_WAITQUEUE(wait, current); | |
1541 | struct sk_buff *skb = NULL; | |
f48cc6b2 | 1542 | int error = 0; |
1576d986 JW |
1543 | |
1544 | skb = skb_array_consume(&tfile->tx_array); | |
1545 | if (skb) | |
1546 | goto out; | |
1547 | if (noblock) { | |
f48cc6b2 | 1548 | error = -EAGAIN; |
1576d986 JW |
1549 | goto out; |
1550 | } | |
1551 | ||
1552 | add_wait_queue(&tfile->wq.wait, &wait); | |
1553 | current->state = TASK_INTERRUPTIBLE; | |
1554 | ||
1555 | while (1) { | |
1556 | skb = skb_array_consume(&tfile->tx_array); | |
1557 | if (skb) | |
1558 | break; | |
1559 | if (signal_pending(current)) { | |
f48cc6b2 | 1560 | error = -ERESTARTSYS; |
1576d986 JW |
1561 | break; |
1562 | } | |
1563 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { | |
f48cc6b2 | 1564 | error = -EFAULT; |
1576d986 JW |
1565 | break; |
1566 | } | |
1567 | ||
1568 | schedule(); | |
1569 | } | |
1570 | ||
1571 | current->state = TASK_RUNNING; | |
1572 | remove_wait_queue(&tfile->wq.wait, &wait); | |
1573 | ||
1574 | out: | |
f48cc6b2 | 1575 | *err = error; |
1576d986 JW |
1576 | return skb; |
1577 | } | |
1578 | ||
54f968d6 | 1579 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 | 1580 | struct iov_iter *to, |
ac77cfd4 | 1581 | int noblock, struct sk_buff *skb) |
1da177e4 | 1582 | { |
9b067034 | 1583 | ssize_t ret; |
1576d986 | 1584 | int err; |
1da177e4 | 1585 | |
3872baf6 | 1586 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1587 | |
9b067034 AV |
1588 | if (!iov_iter_count(to)) |
1589 | return 0; | |
1da177e4 | 1590 | |
ac77cfd4 JW |
1591 | if (!skb) { |
1592 | /* Read frames from ring */ | |
1593 | skb = tun_ring_recv(tfile, noblock, &err); | |
1594 | if (!skb) | |
1595 | return err; | |
1596 | } | |
e0b46d0e | 1597 | |
9b067034 | 1598 | ret = tun_put_user(tun, tfile, skb, to); |
f51a5e82 | 1599 | if (unlikely(ret < 0)) |
f271b2cc | 1600 | kfree_skb(skb); |
f51a5e82 JW |
1601 | else |
1602 | consume_skb(skb); | |
1da177e4 | 1603 | |
05c2828c MT |
1604 | return ret; |
1605 | } | |
1606 | ||
9b067034 | 1607 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
1608 | { |
1609 | struct file *file = iocb->ki_filp; | |
1610 | struct tun_file *tfile = file->private_data; | |
1611 | struct tun_struct *tun = __tun_get(tfile); | |
9b067034 | 1612 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
1613 | |
1614 | if (!tun) | |
1615 | return -EBADFD; | |
ac77cfd4 | 1616 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL); |
42404c09 | 1617 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1618 | if (ret > 0) |
1619 | iocb->ki_pos = ret; | |
631ab46b | 1620 | tun_put(tun); |
1da177e4 LT |
1621 | return ret; |
1622 | } | |
1623 | ||
96442e42 JW |
1624 | static void tun_free_netdev(struct net_device *dev) |
1625 | { | |
1626 | struct tun_struct *tun = netdev_priv(dev); | |
1627 | ||
4008e97f | 1628 | BUG_ON(!(list_empty(&tun->disabled))); |
608b9977 | 1629 | free_percpu(tun->pcpu_stats); |
96442e42 | 1630 | tun_flow_uninit(tun); |
5dbbaf2d | 1631 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1632 | } |
1633 | ||
1da177e4 LT |
1634 | static void tun_setup(struct net_device *dev) |
1635 | { | |
1636 | struct tun_struct *tun = netdev_priv(dev); | |
1637 | ||
0625c883 EB |
1638 | tun->owner = INVALID_UID; |
1639 | tun->group = INVALID_GID; | |
1da177e4 | 1640 | |
1da177e4 | 1641 | dev->ethtool_ops = &tun_ethtool_ops; |
cf124db5 DM |
1642 | dev->needs_free_netdev = true; |
1643 | dev->priv_destructor = tun_free_netdev; | |
016adb72 JW |
1644 | /* We prefer our own queue length */ |
1645 | dev->tx_queue_len = TUN_READQ_SIZE; | |
1da177e4 LT |
1646 | } |
1647 | ||
f019a7a5 EB |
1648 | /* Trivial set of netlink ops to allow deleting tun or tap |
1649 | * device with netlink. | |
1650 | */ | |
a8b8a889 MS |
1651 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[], |
1652 | struct netlink_ext_ack *extack) | |
f019a7a5 EB |
1653 | { |
1654 | return -EINVAL; | |
1655 | } | |
1656 | ||
1657 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1658 | .kind = DRV_NAME, | |
1659 | .priv_size = sizeof(struct tun_struct), | |
1660 | .setup = tun_setup, | |
1661 | .validate = tun_validate, | |
1662 | }; | |
1663 | ||
33dccbb0 HX |
1664 | static void tun_sock_write_space(struct sock *sk) |
1665 | { | |
54f968d6 | 1666 | struct tun_file *tfile; |
43815482 | 1667 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1668 | |
1669 | if (!sock_writeable(sk)) | |
1670 | return; | |
1671 | ||
9cd3e072 | 1672 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
33dccbb0 HX |
1673 | return; |
1674 | ||
43815482 ED |
1675 | wqueue = sk_sleep(sk); |
1676 | if (wqueue && waitqueue_active(wqueue)) | |
1677 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1678 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1679 | |
54f968d6 JW |
1680 | tfile = container_of(sk, struct tun_file, sk); |
1681 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1682 | } |
1683 | ||
1b784140 | 1684 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 1685 | { |
54f968d6 JW |
1686 | int ret; |
1687 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1688 | struct tun_struct *tun = __tun_get(tfile); | |
1689 | ||
1690 | if (!tun) | |
1691 | return -EBADFD; | |
f5ff53b4 | 1692 | |
c0371da6 | 1693 | ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, |
5503fcec JW |
1694 | m->msg_flags & MSG_DONTWAIT, |
1695 | m->msg_flags & MSG_MORE); | |
54f968d6 JW |
1696 | tun_put(tun); |
1697 | return ret; | |
05c2828c MT |
1698 | } |
1699 | ||
1b784140 | 1700 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
1701 | int flags) |
1702 | { | |
54f968d6 JW |
1703 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1704 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1705 | int ret; |
54f968d6 JW |
1706 | |
1707 | if (!tun) | |
1708 | return -EBADFD; | |
1709 | ||
eda29772 | 1710 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1711 | ret = -EINVAL; |
1712 | goto out; | |
1713 | } | |
eda29772 RC |
1714 | if (flags & MSG_ERRQUEUE) { |
1715 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1716 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1717 | goto out; | |
1718 | } | |
ac77cfd4 JW |
1719 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, |
1720 | m->msg_control); | |
87897931 | 1721 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
1722 | m->msg_flags |= MSG_TRUNC; |
1723 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1724 | } | |
3811ae76 | 1725 | out: |
54f968d6 | 1726 | tun_put(tun); |
05c2828c MT |
1727 | return ret; |
1728 | } | |
1729 | ||
1576d986 JW |
1730 | static int tun_peek_len(struct socket *sock) |
1731 | { | |
1732 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1733 | struct tun_struct *tun; | |
1734 | int ret = 0; | |
1735 | ||
1736 | tun = __tun_get(tfile); | |
1737 | if (!tun) | |
1738 | return 0; | |
1739 | ||
1740 | ret = skb_array_peek_len(&tfile->tx_array); | |
1741 | tun_put(tun); | |
1742 | ||
1743 | return ret; | |
1744 | } | |
1745 | ||
05c2828c MT |
1746 | /* Ops structure to mimic raw sockets with tun */ |
1747 | static const struct proto_ops tun_socket_ops = { | |
1576d986 | 1748 | .peek_len = tun_peek_len, |
05c2828c MT |
1749 | .sendmsg = tun_sendmsg, |
1750 | .recvmsg = tun_recvmsg, | |
1751 | }; | |
1752 | ||
33dccbb0 HX |
1753 | static struct proto tun_proto = { |
1754 | .name = "tun", | |
1755 | .owner = THIS_MODULE, | |
54f968d6 | 1756 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1757 | }; |
f019a7a5 | 1758 | |
980c9e8c DW |
1759 | static int tun_flags(struct tun_struct *tun) |
1760 | { | |
031f5e03 | 1761 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
1762 | } |
1763 | ||
1764 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1765 | char *buf) | |
1766 | { | |
1767 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1768 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1769 | } | |
1770 | ||
1771 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1772 | char *buf) | |
1773 | { | |
1774 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1775 | return uid_valid(tun->owner)? |
1776 | sprintf(buf, "%u\n", | |
1777 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1778 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1779 | } |
1780 | ||
1781 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1782 | char *buf) | |
1783 | { | |
1784 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1785 | return gid_valid(tun->group) ? |
1786 | sprintf(buf, "%u\n", | |
1787 | from_kgid_munged(current_user_ns(), tun->group)): | |
1788 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1789 | } |
1790 | ||
1791 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1792 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1793 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1794 | ||
c4d33e24 TI |
1795 | static struct attribute *tun_dev_attrs[] = { |
1796 | &dev_attr_tun_flags.attr, | |
1797 | &dev_attr_owner.attr, | |
1798 | &dev_attr_group.attr, | |
1799 | NULL | |
1800 | }; | |
1801 | ||
1802 | static const struct attribute_group tun_attr_group = { | |
1803 | .attrs = tun_dev_attrs | |
1804 | }; | |
1805 | ||
d647a591 | 1806 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1807 | { |
1808 | struct tun_struct *tun; | |
54f968d6 | 1809 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1810 | struct net_device *dev; |
1811 | int err; | |
1812 | ||
7c0c3b1a JW |
1813 | if (tfile->detached) |
1814 | return -EINVAL; | |
1815 | ||
74a3e5a7 EB |
1816 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1817 | if (dev) { | |
f85ba780 DW |
1818 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1819 | return -EBUSY; | |
74a3e5a7 EB |
1820 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1821 | tun = netdev_priv(dev); | |
1822 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1823 | tun = netdev_priv(dev); | |
1824 | else | |
1825 | return -EINVAL; | |
1826 | ||
8e6d91ae | 1827 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 1828 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
1829 | return -EINVAL; |
1830 | ||
cde8b15f | 1831 | if (tun_not_capable(tun)) |
2b980dbd | 1832 | return -EPERM; |
5dbbaf2d | 1833 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1834 | if (err < 0) |
1835 | return err; | |
1836 | ||
849c9b6f | 1837 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1838 | if (err < 0) |
1839 | return err; | |
4008e97f | 1840 | |
40630b82 | 1841 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
1842 | (tun->numqueues + tun->numdisabled > 1)) { |
1843 | /* One or more queue has already been attached, no need | |
1844 | * to initialize the device again. | |
1845 | */ | |
1846 | return 0; | |
1847 | } | |
6aa20a22 | 1848 | } |
1da177e4 LT |
1849 | else { |
1850 | char *name; | |
1851 | unsigned long flags = 0; | |
edfb6a14 JW |
1852 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1853 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1854 | |
c260b772 | 1855 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1856 | return -EPERM; |
2b980dbd PM |
1857 | err = security_tun_dev_create(); |
1858 | if (err < 0) | |
1859 | return err; | |
ca6bb5d7 | 1860 | |
1da177e4 LT |
1861 | /* Set dev type */ |
1862 | if (ifr->ifr_flags & IFF_TUN) { | |
1863 | /* TUN device */ | |
40630b82 | 1864 | flags |= IFF_TUN; |
1da177e4 LT |
1865 | name = "tun%d"; |
1866 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1867 | /* TAP device */ | |
40630b82 | 1868 | flags |= IFF_TAP; |
1da177e4 | 1869 | name = "tap%d"; |
6aa20a22 | 1870 | } else |
36989b90 | 1871 | return -EINVAL; |
6aa20a22 | 1872 | |
1da177e4 LT |
1873 | if (*ifr->ifr_name) |
1874 | name = ifr->ifr_name; | |
1875 | ||
c8d68e6b | 1876 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
1877 | NET_NAME_UNKNOWN, tun_setup, queues, |
1878 | queues); | |
edfb6a14 | 1879 | |
1da177e4 LT |
1880 | if (!dev) |
1881 | return -ENOMEM; | |
1882 | ||
fc54c658 | 1883 | dev_net_set(dev, net); |
f019a7a5 | 1884 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1885 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 1886 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 1887 | |
1da177e4 LT |
1888 | tun = netdev_priv(dev); |
1889 | tun->dev = dev; | |
1890 | tun->flags = flags; | |
f271b2cc | 1891 | tun->txflt.count = 0; |
d9d52b51 | 1892 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1893 | |
eaea34b2 | 1894 | tun->align = NET_SKB_PAD; |
54f968d6 JW |
1895 | tun->filter_attached = false; |
1896 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
5503fcec | 1897 | tun->rx_batched = 0; |
33dccbb0 | 1898 | |
608b9977 PA |
1899 | tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); |
1900 | if (!tun->pcpu_stats) { | |
1901 | err = -ENOMEM; | |
1902 | goto err_free_dev; | |
1903 | } | |
1904 | ||
96442e42 JW |
1905 | spin_lock_init(&tun->lock); |
1906 | ||
5dbbaf2d PM |
1907 | err = security_tun_dev_alloc_security(&tun->security); |
1908 | if (err < 0) | |
608b9977 | 1909 | goto err_free_stat; |
2b980dbd | 1910 | |
1da177e4 | 1911 | tun_net_init(dev); |
944a1376 | 1912 | tun_flow_init(tun); |
96442e42 | 1913 | |
88255375 | 1914 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1915 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1916 | NETIF_F_HW_VLAN_STAG_TX; | |
2a2bbf17 | 1917 | dev->features = dev->hw_features | NETIF_F_LLTX; |
6671b224 FLVC |
1918 | dev->vlan_features = dev->features & |
1919 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
1920 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 1921 | |
4008e97f | 1922 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1923 | err = tun_attach(tun, file, false); |
eb0fb363 | 1924 | if (err < 0) |
662ca437 | 1925 | goto err_free_flow; |
eb0fb363 | 1926 | |
1da177e4 LT |
1927 | err = register_netdevice(tun->dev); |
1928 | if (err < 0) | |
662ca437 | 1929 | goto err_detach; |
1da177e4 LT |
1930 | } |
1931 | ||
af668b3c MT |
1932 | netif_carrier_on(tun->dev); |
1933 | ||
6b8a66ee | 1934 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 1935 | |
031f5e03 MT |
1936 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
1937 | (ifr->ifr_flags & TUN_FEATURES); | |
c8d68e6b | 1938 | |
e35259a9 MK |
1939 | /* Make sure persistent devices do not get stuck in |
1940 | * xoff state. | |
1941 | */ | |
1942 | if (netif_running(tun->dev)) | |
c8d68e6b | 1943 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1944 | |
1da177e4 LT |
1945 | strcpy(ifr->ifr_name, tun->dev->name); |
1946 | return 0; | |
1947 | ||
662ca437 JW |
1948 | err_detach: |
1949 | tun_detach_all(dev); | |
1950 | err_free_flow: | |
1951 | tun_flow_uninit(tun); | |
1952 | security_tun_dev_free_security(tun->security); | |
608b9977 PA |
1953 | err_free_stat: |
1954 | free_percpu(tun->pcpu_stats); | |
662ca437 | 1955 | err_free_dev: |
1da177e4 | 1956 | free_netdev(dev); |
1da177e4 LT |
1957 | return err; |
1958 | } | |
1959 | ||
9ce99cf6 | 1960 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1961 | struct ifreq *ifr) |
e3b99556 | 1962 | { |
6b8a66ee | 1963 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1964 | |
1965 | strcpy(ifr->ifr_name, tun->dev->name); | |
1966 | ||
980c9e8c | 1967 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1968 | |
e3b99556 MM |
1969 | } |
1970 | ||
5228ddc9 RR |
1971 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1972 | * privs required. */ | |
88255375 | 1973 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1974 | { |
c8f44aff | 1975 | netdev_features_t features = 0; |
5228ddc9 RR |
1976 | |
1977 | if (arg & TUN_F_CSUM) { | |
88255375 | 1978 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1979 | arg &= ~TUN_F_CSUM; |
1980 | ||
1981 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1982 | if (arg & TUN_F_TSO_ECN) { | |
1983 | features |= NETIF_F_TSO_ECN; | |
1984 | arg &= ~TUN_F_TSO_ECN; | |
1985 | } | |
1986 | if (arg & TUN_F_TSO4) | |
1987 | features |= NETIF_F_TSO; | |
1988 | if (arg & TUN_F_TSO6) | |
1989 | features |= NETIF_F_TSO6; | |
1990 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | /* This gives the user a way to test for new features in future by | |
1995 | * trying to set them. */ | |
1996 | if (arg) | |
1997 | return -EINVAL; | |
1998 | ||
88255375 | 1999 | tun->set_features = features; |
09050957 YI |
2000 | tun->dev->wanted_features &= ~TUN_USER_FEATURES; |
2001 | tun->dev->wanted_features |= features; | |
88255375 | 2002 | netdev_update_features(tun->dev); |
5228ddc9 RR |
2003 | |
2004 | return 0; | |
2005 | } | |
2006 | ||
c8d68e6b JW |
2007 | static void tun_detach_filter(struct tun_struct *tun, int n) |
2008 | { | |
2009 | int i; | |
2010 | struct tun_file *tfile; | |
2011 | ||
2012 | for (i = 0; i < n; i++) { | |
b8deabd3 | 2013 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2014 | lock_sock(tfile->socket.sk); |
2015 | sk_detach_filter(tfile->socket.sk); | |
2016 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2017 | } |
2018 | ||
2019 | tun->filter_attached = false; | |
2020 | } | |
2021 | ||
2022 | static int tun_attach_filter(struct tun_struct *tun) | |
2023 | { | |
2024 | int i, ret = 0; | |
2025 | struct tun_file *tfile; | |
2026 | ||
2027 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2028 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2029 | lock_sock(tfile->socket.sk); |
2030 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
2031 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2032 | if (ret) { |
2033 | tun_detach_filter(tun, i); | |
2034 | return ret; | |
2035 | } | |
2036 | } | |
2037 | ||
2038 | tun->filter_attached = true; | |
2039 | return ret; | |
2040 | } | |
2041 | ||
2042 | static void tun_set_sndbuf(struct tun_struct *tun) | |
2043 | { | |
2044 | struct tun_file *tfile; | |
2045 | int i; | |
2046 | ||
2047 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2048 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
2049 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
2050 | } | |
2051 | } | |
2052 | ||
cde8b15f JW |
2053 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
2054 | { | |
2055 | struct tun_file *tfile = file->private_data; | |
2056 | struct tun_struct *tun; | |
cde8b15f JW |
2057 | int ret = 0; |
2058 | ||
2059 | rtnl_lock(); | |
2060 | ||
2061 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 2062 | tun = tfile->detached; |
5dbbaf2d | 2063 | if (!tun) { |
cde8b15f | 2064 | ret = -EINVAL; |
5dbbaf2d PM |
2065 | goto unlock; |
2066 | } | |
2067 | ret = security_tun_dev_attach_queue(tun->security); | |
2068 | if (ret < 0) | |
2069 | goto unlock; | |
849c9b6f | 2070 | ret = tun_attach(tun, file, false); |
4008e97f | 2071 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 2072 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 2073 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
2074 | ret = -EINVAL; |
2075 | else | |
2076 | __tun_detach(tfile, false); | |
2077 | } else | |
cde8b15f JW |
2078 | ret = -EINVAL; |
2079 | ||
5dbbaf2d | 2080 | unlock: |
cde8b15f JW |
2081 | rtnl_unlock(); |
2082 | return ret; | |
2083 | } | |
2084 | ||
50857e2a AB |
2085 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
2086 | unsigned long arg, int ifreq_len) | |
1da177e4 | 2087 | { |
36b50bab | 2088 | struct tun_file *tfile = file->private_data; |
631ab46b | 2089 | struct tun_struct *tun; |
1da177e4 LT |
2090 | void __user* argp = (void __user*)arg; |
2091 | struct ifreq ifr; | |
0625c883 EB |
2092 | kuid_t owner; |
2093 | kgid_t group; | |
33dccbb0 | 2094 | int sndbuf; |
d9d52b51 | 2095 | int vnet_hdr_sz; |
fb7589a1 | 2096 | unsigned int ifindex; |
1cf8e410 | 2097 | int le; |
f271b2cc | 2098 | int ret; |
1da177e4 | 2099 | |
20861f26 | 2100 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == SOCK_IOC_TYPE) { |
50857e2a | 2101 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 2102 | return -EFAULT; |
8bbb1813 | 2103 | } else { |
a117dacd | 2104 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 2105 | } |
631ab46b EB |
2106 | if (cmd == TUNGETFEATURES) { |
2107 | /* Currently this just means: "what IFF flags are valid?". | |
2108 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
2109 | * TUNSETIFF. |
2110 | */ | |
2111 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 2112 | (unsigned int __user*)argp); |
cde8b15f JW |
2113 | } else if (cmd == TUNSETQUEUE) |
2114 | return tun_set_queue(file, &ifr); | |
631ab46b | 2115 | |
c8d68e6b | 2116 | ret = 0; |
876bfd4d HX |
2117 | rtnl_lock(); |
2118 | ||
36b50bab | 2119 | tun = __tun_get(tfile); |
0f16bc13 GF |
2120 | if (cmd == TUNSETIFF) { |
2121 | ret = -EEXIST; | |
2122 | if (tun) | |
2123 | goto unlock; | |
2124 | ||
1da177e4 LT |
2125 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
2126 | ||
140e807d | 2127 | ret = tun_set_iff(sock_net(&tfile->sk), file, &ifr); |
1da177e4 | 2128 | |
876bfd4d HX |
2129 | if (ret) |
2130 | goto unlock; | |
1da177e4 | 2131 | |
50857e2a | 2132 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
2133 | ret = -EFAULT; |
2134 | goto unlock; | |
1da177e4 | 2135 | } |
fb7589a1 PE |
2136 | if (cmd == TUNSETIFINDEX) { |
2137 | ret = -EPERM; | |
2138 | if (tun) | |
2139 | goto unlock; | |
2140 | ||
2141 | ret = -EFAULT; | |
2142 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
2143 | goto unlock; | |
2144 | ||
2145 | ret = 0; | |
2146 | tfile->ifindex = ifindex; | |
2147 | goto unlock; | |
2148 | } | |
1da177e4 | 2149 | |
876bfd4d | 2150 | ret = -EBADFD; |
1da177e4 | 2151 | if (!tun) |
876bfd4d | 2152 | goto unlock; |
1da177e4 | 2153 | |
1e588338 | 2154 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 2155 | |
631ab46b | 2156 | ret = 0; |
1da177e4 | 2157 | switch (cmd) { |
e3b99556 | 2158 | case TUNGETIFF: |
9ce99cf6 | 2159 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 2160 | |
3d407a80 PE |
2161 | if (tfile->detached) |
2162 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
2163 | if (!tfile->socket.sk->sk_filter) |
2164 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 2165 | |
50857e2a | 2166 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 2167 | ret = -EFAULT; |
e3b99556 MM |
2168 | break; |
2169 | ||
1da177e4 LT |
2170 | case TUNSETNOCSUM: |
2171 | /* Disable/Enable checksum */ | |
1da177e4 | 2172 | |
88255375 MM |
2173 | /* [unimplemented] */ |
2174 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 2175 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
2176 | break; |
2177 | ||
2178 | case TUNSETPERSIST: | |
54f968d6 JW |
2179 | /* Disable/Enable persist mode. Keep an extra reference to the |
2180 | * module to prevent the module being unprobed. | |
2181 | */ | |
40630b82 MT |
2182 | if (arg && !(tun->flags & IFF_PERSIST)) { |
2183 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 2184 | __module_get(THIS_MODULE); |
dd38bd85 | 2185 | } |
40630b82 MT |
2186 | if (!arg && (tun->flags & IFF_PERSIST)) { |
2187 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 JW |
2188 | module_put(THIS_MODULE); |
2189 | } | |
1da177e4 | 2190 | |
6b8a66ee JP |
2191 | tun_debug(KERN_INFO, tun, "persist %s\n", |
2192 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
2193 | break; |
2194 | ||
2195 | case TUNSETOWNER: | |
2196 | /* Set owner of the device */ | |
0625c883 EB |
2197 | owner = make_kuid(current_user_ns(), arg); |
2198 | if (!uid_valid(owner)) { | |
2199 | ret = -EINVAL; | |
2200 | break; | |
2201 | } | |
2202 | tun->owner = owner; | |
1e588338 | 2203 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 2204 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
2205 | break; |
2206 | ||
8c644623 GG |
2207 | case TUNSETGROUP: |
2208 | /* Set group of the device */ | |
0625c883 EB |
2209 | group = make_kgid(current_user_ns(), arg); |
2210 | if (!gid_valid(group)) { | |
2211 | ret = -EINVAL; | |
2212 | break; | |
2213 | } | |
2214 | tun->group = group; | |
1e588338 | 2215 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 2216 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
2217 | break; |
2218 | ||
ff4cc3ac MK |
2219 | case TUNSETLINK: |
2220 | /* Only allow setting the type when the interface is down */ | |
2221 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
2222 | tun_debug(KERN_INFO, tun, |
2223 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 2224 | ret = -EBUSY; |
ff4cc3ac MK |
2225 | } else { |
2226 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
2227 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
2228 | tun->dev->type); | |
48abfe05 | 2229 | ret = 0; |
ff4cc3ac | 2230 | } |
631ab46b | 2231 | break; |
ff4cc3ac | 2232 | |
1da177e4 LT |
2233 | #ifdef TUN_DEBUG |
2234 | case TUNSETDEBUG: | |
2235 | tun->debug = arg; | |
2236 | break; | |
2237 | #endif | |
5228ddc9 | 2238 | case TUNSETOFFLOAD: |
88255375 | 2239 | ret = set_offload(tun, arg); |
631ab46b | 2240 | break; |
5228ddc9 | 2241 | |
f271b2cc MK |
2242 | case TUNSETTXFILTER: |
2243 | /* Can be set only for TAPs */ | |
631ab46b | 2244 | ret = -EINVAL; |
40630b82 | 2245 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 2246 | break; |
c0e5a8c2 | 2247 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2248 | break; |
1da177e4 LT |
2249 | |
2250 | case SIOCGIFHWADDR: | |
b595076a | 2251 | /* Get hw address */ |
f271b2cc MK |
2252 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2253 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2254 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2255 | ret = -EFAULT; |
2256 | break; | |
1da177e4 LT |
2257 | |
2258 | case SIOCSIFHWADDR: | |
f271b2cc | 2259 | /* Set hw address */ |
6b8a66ee JP |
2260 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2261 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2262 | |
40102371 | 2263 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2264 | break; |
33dccbb0 HX |
2265 | |
2266 | case TUNGETSNDBUF: | |
54f968d6 | 2267 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2268 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2269 | ret = -EFAULT; | |
2270 | break; | |
2271 | ||
2272 | case TUNSETSNDBUF: | |
2273 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2274 | ret = -EFAULT; | |
2275 | break; | |
2276 | } | |
2277 | ||
c8d68e6b JW |
2278 | tun->sndbuf = sndbuf; |
2279 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2280 | break; |
2281 | ||
d9d52b51 MT |
2282 | case TUNGETVNETHDRSZ: |
2283 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2284 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2285 | ret = -EFAULT; | |
2286 | break; | |
2287 | ||
2288 | case TUNSETVNETHDRSZ: | |
2289 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2290 | ret = -EFAULT; | |
2291 | break; | |
2292 | } | |
2293 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2294 | ret = -EINVAL; | |
2295 | break; | |
2296 | } | |
2297 | ||
2298 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2299 | break; | |
2300 | ||
1cf8e410 MT |
2301 | case TUNGETVNETLE: |
2302 | le = !!(tun->flags & TUN_VNET_LE); | |
2303 | if (put_user(le, (int __user *)argp)) | |
2304 | ret = -EFAULT; | |
2305 | break; | |
2306 | ||
2307 | case TUNSETVNETLE: | |
2308 | if (get_user(le, (int __user *)argp)) { | |
2309 | ret = -EFAULT; | |
2310 | break; | |
2311 | } | |
2312 | if (le) | |
2313 | tun->flags |= TUN_VNET_LE; | |
2314 | else | |
2315 | tun->flags &= ~TUN_VNET_LE; | |
2316 | break; | |
2317 | ||
8b8e658b GK |
2318 | case TUNGETVNETBE: |
2319 | ret = tun_get_vnet_be(tun, argp); | |
2320 | break; | |
2321 | ||
2322 | case TUNSETVNETBE: | |
2323 | ret = tun_set_vnet_be(tun, argp); | |
2324 | break; | |
2325 | ||
99405162 MT |
2326 | case TUNATTACHFILTER: |
2327 | /* Can be set only for TAPs */ | |
2328 | ret = -EINVAL; | |
40630b82 | 2329 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
2330 | break; |
2331 | ret = -EFAULT; | |
54f968d6 | 2332 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2333 | break; |
2334 | ||
c8d68e6b | 2335 | ret = tun_attach_filter(tun); |
99405162 MT |
2336 | break; |
2337 | ||
2338 | case TUNDETACHFILTER: | |
2339 | /* Can be set only for TAPs */ | |
2340 | ret = -EINVAL; | |
40630b82 | 2341 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 2342 | break; |
c8d68e6b JW |
2343 | ret = 0; |
2344 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2345 | break; |
2346 | ||
76975e9c PE |
2347 | case TUNGETFILTER: |
2348 | ret = -EINVAL; | |
40630b82 | 2349 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
2350 | break; |
2351 | ret = -EFAULT; | |
2352 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2353 | break; | |
2354 | ret = 0; | |
2355 | break; | |
2356 | ||
1da177e4 | 2357 | default: |
631ab46b EB |
2358 | ret = -EINVAL; |
2359 | break; | |
ee289b64 | 2360 | } |
1da177e4 | 2361 | |
876bfd4d HX |
2362 | unlock: |
2363 | rtnl_unlock(); | |
2364 | if (tun) | |
2365 | tun_put(tun); | |
631ab46b | 2366 | return ret; |
1da177e4 LT |
2367 | } |
2368 | ||
50857e2a AB |
2369 | static long tun_chr_ioctl(struct file *file, |
2370 | unsigned int cmd, unsigned long arg) | |
2371 | { | |
2372 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2373 | } | |
2374 | ||
2375 | #ifdef CONFIG_COMPAT | |
2376 | static long tun_chr_compat_ioctl(struct file *file, | |
2377 | unsigned int cmd, unsigned long arg) | |
2378 | { | |
2379 | switch (cmd) { | |
2380 | case TUNSETIFF: | |
2381 | case TUNGETIFF: | |
2382 | case TUNSETTXFILTER: | |
2383 | case TUNGETSNDBUF: | |
2384 | case TUNSETSNDBUF: | |
2385 | case SIOCGIFHWADDR: | |
2386 | case SIOCSIFHWADDR: | |
2387 | arg = (unsigned long)compat_ptr(arg); | |
2388 | break; | |
2389 | default: | |
2390 | arg = (compat_ulong_t)arg; | |
2391 | break; | |
2392 | } | |
2393 | ||
2394 | /* | |
2395 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2396 | * the end of that structure. All fields that are used in this | |
2397 | * driver are compatible though, we don't need to convert the | |
2398 | * contents. | |
2399 | */ | |
2400 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2401 | } | |
2402 | #endif /* CONFIG_COMPAT */ | |
2403 | ||
1da177e4 LT |
2404 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2405 | { | |
54f968d6 | 2406 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2407 | int ret; |
2408 | ||
54f968d6 | 2409 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2410 | goto out; |
6aa20a22 | 2411 | |
1da177e4 | 2412 | if (on) { |
e0b93edd | 2413 | __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
54f968d6 | 2414 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2415 | } else |
54f968d6 | 2416 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2417 | ret = 0; |
2418 | out: | |
9d319522 | 2419 | return ret; |
1da177e4 LT |
2420 | } |
2421 | ||
2422 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2423 | { | |
140e807d | 2424 | struct net *net = current->nsproxy->net_ns; |
631ab46b | 2425 | struct tun_file *tfile; |
deed49fb | 2426 | |
6b8a66ee | 2427 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2428 | |
140e807d | 2429 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
11aa9c28 | 2430 | &tun_proto, 0); |
631ab46b EB |
2431 | if (!tfile) |
2432 | return -ENOMEM; | |
c956674b | 2433 | RCU_INIT_POINTER(tfile->tun, NULL); |
54f968d6 | 2434 | tfile->flags = 0; |
fb7589a1 | 2435 | tfile->ifindex = 0; |
54f968d6 | 2436 | |
54f968d6 | 2437 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 2438 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
2439 | |
2440 | tfile->socket.file = file; | |
2441 | tfile->socket.ops = &tun_socket_ops; | |
2442 | ||
2443 | sock_init_data(&tfile->socket, &tfile->sk); | |
54f968d6 JW |
2444 | |
2445 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2446 | tfile->sk.sk_sndbuf = INT_MAX; | |
2447 | ||
66ccbc9c JW |
2448 | tfile->alloc_frag.page = NULL; |
2449 | ||
631ab46b | 2450 | file->private_data = tfile; |
4008e97f | 2451 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2452 | |
19a6afb2 JW |
2453 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2454 | ||
1da177e4 LT |
2455 | return 0; |
2456 | } | |
2457 | ||
2458 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2459 | { | |
631ab46b | 2460 | struct tun_file *tfile = file->private_data; |
1da177e4 | 2461 | |
c8d68e6b | 2462 | tun_detach(tfile, true); |
1da177e4 LT |
2463 | |
2464 | return 0; | |
2465 | } | |
2466 | ||
93e14b6d | 2467 | #ifdef CONFIG_PROC_FS |
a3816ab0 | 2468 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f) |
93e14b6d MY |
2469 | { |
2470 | struct tun_struct *tun; | |
2471 | struct ifreq ifr; | |
2472 | ||
2473 | memset(&ifr, 0, sizeof(ifr)); | |
2474 | ||
2475 | rtnl_lock(); | |
2476 | tun = tun_get(f); | |
2477 | if (tun) | |
2478 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
2479 | rtnl_unlock(); | |
2480 | ||
2481 | if (tun) | |
2482 | tun_put(tun); | |
2483 | ||
a3816ab0 | 2484 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
2485 | } |
2486 | #endif | |
2487 | ||
d54b1fdb | 2488 | static const struct file_operations tun_fops = { |
6aa20a22 | 2489 | .owner = THIS_MODULE, |
1da177e4 | 2490 | .llseek = no_llseek, |
9b067034 | 2491 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 2492 | .write_iter = tun_chr_write_iter, |
1da177e4 | 2493 | .poll = tun_chr_poll, |
50857e2a AB |
2494 | .unlocked_ioctl = tun_chr_ioctl, |
2495 | #ifdef CONFIG_COMPAT | |
2496 | .compat_ioctl = tun_chr_compat_ioctl, | |
2497 | #endif | |
1da177e4 LT |
2498 | .open = tun_chr_open, |
2499 | .release = tun_chr_close, | |
93e14b6d MY |
2500 | .fasync = tun_chr_fasync, |
2501 | #ifdef CONFIG_PROC_FS | |
2502 | .show_fdinfo = tun_chr_show_fdinfo, | |
2503 | #endif | |
1da177e4 LT |
2504 | }; |
2505 | ||
2506 | static struct miscdevice tun_miscdev = { | |
2507 | .minor = TUN_MINOR, | |
2508 | .name = "tun", | |
e454cea2 | 2509 | .nodename = "net/tun", |
1da177e4 | 2510 | .fops = &tun_fops, |
1da177e4 LT |
2511 | }; |
2512 | ||
2513 | /* ethtool interface */ | |
2514 | ||
29ccc49d PR |
2515 | static int tun_get_link_ksettings(struct net_device *dev, |
2516 | struct ethtool_link_ksettings *cmd) | |
2517 | { | |
2518 | ethtool_link_ksettings_zero_link_mode(cmd, supported); | |
2519 | ethtool_link_ksettings_zero_link_mode(cmd, advertising); | |
2520 | cmd->base.speed = SPEED_10; | |
2521 | cmd->base.duplex = DUPLEX_FULL; | |
2522 | cmd->base.port = PORT_TP; | |
2523 | cmd->base.phy_address = 0; | |
2524 | cmd->base.autoneg = AUTONEG_DISABLE; | |
1da177e4 LT |
2525 | return 0; |
2526 | } | |
2527 | ||
2528 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2529 | { | |
2530 | struct tun_struct *tun = netdev_priv(dev); | |
2531 | ||
33a5ba14 RJ |
2532 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2533 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2534 | |
2535 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 2536 | case IFF_TUN: |
33a5ba14 | 2537 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 2538 | break; |
40630b82 | 2539 | case IFF_TAP: |
33a5ba14 | 2540 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2541 | break; |
2542 | } | |
2543 | } | |
2544 | ||
2545 | static u32 tun_get_msglevel(struct net_device *dev) | |
2546 | { | |
2547 | #ifdef TUN_DEBUG | |
2548 | struct tun_struct *tun = netdev_priv(dev); | |
2549 | return tun->debug; | |
2550 | #else | |
2551 | return -EOPNOTSUPP; | |
2552 | #endif | |
2553 | } | |
2554 | ||
2555 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2556 | { | |
2557 | #ifdef TUN_DEBUG | |
2558 | struct tun_struct *tun = netdev_priv(dev); | |
2559 | tun->debug = value; | |
2560 | #endif | |
2561 | } | |
2562 | ||
5503fcec JW |
2563 | static int tun_get_coalesce(struct net_device *dev, |
2564 | struct ethtool_coalesce *ec) | |
2565 | { | |
2566 | struct tun_struct *tun = netdev_priv(dev); | |
2567 | ||
2568 | ec->rx_max_coalesced_frames = tun->rx_batched; | |
2569 | ||
2570 | return 0; | |
2571 | } | |
2572 | ||
2573 | static int tun_set_coalesce(struct net_device *dev, | |
2574 | struct ethtool_coalesce *ec) | |
2575 | { | |
2576 | struct tun_struct *tun = netdev_priv(dev); | |
2577 | ||
2578 | if (ec->rx_max_coalesced_frames > NAPI_POLL_WEIGHT) | |
2579 | tun->rx_batched = NAPI_POLL_WEIGHT; | |
2580 | else | |
2581 | tun->rx_batched = ec->rx_max_coalesced_frames; | |
2582 | ||
2583 | return 0; | |
2584 | } | |
2585 | ||
7282d491 | 2586 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2587 | .get_drvinfo = tun_get_drvinfo, |
2588 | .get_msglevel = tun_get_msglevel, | |
2589 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2590 | .get_link = ethtool_op_get_link, |
eda29772 | 2591 | .get_ts_info = ethtool_op_get_ts_info, |
5503fcec JW |
2592 | .get_coalesce = tun_get_coalesce, |
2593 | .set_coalesce = tun_set_coalesce, | |
29ccc49d | 2594 | .get_link_ksettings = tun_get_link_ksettings, |
1da177e4 LT |
2595 | }; |
2596 | ||
1576d986 JW |
2597 | static int tun_queue_resize(struct tun_struct *tun) |
2598 | { | |
2599 | struct net_device *dev = tun->dev; | |
2600 | struct tun_file *tfile; | |
2601 | struct skb_array **arrays; | |
2602 | int n = tun->numqueues + tun->numdisabled; | |
2603 | int ret, i; | |
2604 | ||
2605 | arrays = kmalloc(sizeof *arrays * n, GFP_KERNEL); | |
2606 | if (!arrays) | |
2607 | return -ENOMEM; | |
2608 | ||
2609 | for (i = 0; i < tun->numqueues; i++) { | |
2610 | tfile = rtnl_dereference(tun->tfiles[i]); | |
2611 | arrays[i] = &tfile->tx_array; | |
2612 | } | |
2613 | list_for_each_entry(tfile, &tun->disabled, next) | |
2614 | arrays[i++] = &tfile->tx_array; | |
2615 | ||
2616 | ret = skb_array_resize_multiple(arrays, n, | |
2617 | dev->tx_queue_len, GFP_KERNEL); | |
2618 | ||
2619 | kfree(arrays); | |
2620 | return ret; | |
2621 | } | |
2622 | ||
2623 | static int tun_device_event(struct notifier_block *unused, | |
2624 | unsigned long event, void *ptr) | |
2625 | { | |
2626 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2627 | struct tun_struct *tun = netdev_priv(dev); | |
2628 | ||
86dfb4ac CG |
2629 | if (dev->rtnl_link_ops != &tun_link_ops) |
2630 | return NOTIFY_DONE; | |
2631 | ||
1576d986 JW |
2632 | switch (event) { |
2633 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
2634 | if (tun_queue_resize(tun)) | |
2635 | return NOTIFY_BAD; | |
2636 | break; | |
2637 | default: | |
2638 | break; | |
2639 | } | |
2640 | ||
2641 | return NOTIFY_DONE; | |
2642 | } | |
2643 | ||
2644 | static struct notifier_block tun_notifier_block __read_mostly = { | |
2645 | .notifier_call = tun_device_event, | |
2646 | }; | |
79d17604 | 2647 | |
1da177e4 LT |
2648 | static int __init tun_init(void) |
2649 | { | |
2650 | int ret = 0; | |
2651 | ||
6b8a66ee | 2652 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1da177e4 | 2653 | |
f019a7a5 | 2654 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2655 | if (ret) { |
6b8a66ee | 2656 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2657 | goto err_linkops; |
79d17604 PE |
2658 | } |
2659 | ||
1da177e4 | 2660 | ret = misc_register(&tun_miscdev); |
79d17604 | 2661 | if (ret) { |
6b8a66ee | 2662 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2663 | goto err_misc; |
2664 | } | |
1576d986 | 2665 | |
5edfbd3c TZ |
2666 | ret = register_netdevice_notifier(&tun_notifier_block); |
2667 | if (ret) { | |
2668 | pr_err("Can't register netdevice notifier\n"); | |
2669 | goto err_notifier; | |
2670 | } | |
2671 | ||
f019a7a5 | 2672 | return 0; |
5edfbd3c TZ |
2673 | |
2674 | err_notifier: | |
2675 | misc_deregister(&tun_miscdev); | |
79d17604 | 2676 | err_misc: |
f019a7a5 EB |
2677 | rtnl_link_unregister(&tun_link_ops); |
2678 | err_linkops: | |
1da177e4 LT |
2679 | return ret; |
2680 | } | |
2681 | ||
2682 | static void tun_cleanup(void) | |
2683 | { | |
6aa20a22 | 2684 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2685 | rtnl_link_unregister(&tun_link_ops); |
1576d986 | 2686 | unregister_netdevice_notifier(&tun_notifier_block); |
1da177e4 LT |
2687 | } |
2688 | ||
05c2828c MT |
2689 | /* Get an underlying socket object from tun file. Returns error unless file is |
2690 | * attached to a device. The returned object works like a packet socket, it | |
2691 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2692 | * holding a reference to the file for as long as the socket is in use. */ | |
2693 | struct socket *tun_get_socket(struct file *file) | |
2694 | { | |
6e914fc7 | 2695 | struct tun_file *tfile; |
05c2828c MT |
2696 | if (file->f_op != &tun_fops) |
2697 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2698 | tfile = file->private_data; |
2699 | if (!tfile) | |
05c2828c | 2700 | return ERR_PTR(-EBADFD); |
54f968d6 | 2701 | return &tfile->socket; |
05c2828c MT |
2702 | } |
2703 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2704 | ||
83339c6b JW |
2705 | struct skb_array *tun_get_skb_array(struct file *file) |
2706 | { | |
2707 | struct tun_file *tfile; | |
2708 | ||
2709 | if (file->f_op != &tun_fops) | |
2710 | return ERR_PTR(-EINVAL); | |
2711 | tfile = file->private_data; | |
2712 | if (!tfile) | |
2713 | return ERR_PTR(-EBADFD); | |
2714 | return &tfile->tx_array; | |
2715 | } | |
2716 | EXPORT_SYMBOL_GPL(tun_get_skb_array); | |
2717 | ||
1da177e4 LT |
2718 | module_init(tun_init); |
2719 | module_exit(tun_cleanup); | |
2720 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2721 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2722 | MODULE_LICENSE("GPL"); | |
2723 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2724 | MODULE_ALIAS("devname:net/tun"); |