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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
344dc8ed | 25 | * Use eth_random_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
6b8a66ee JP |
37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
38 | ||
1da177e4 LT |
39 | #define DRV_NAME "tun" |
40 | #define DRV_VERSION "1.6" | |
41 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
42 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/errno.h> | |
46 | #include <linux/kernel.h> | |
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> |
761876c8 JW |
76 | #include <linux/bpf.h> |
77 | #include <linux/bpf_trace.h> | |
1da177e4 | 78 | |
7c0f6ba6 | 79 | #include <linux/uaccess.h> |
1da177e4 | 80 | |
14daa021 RR |
81 | /* Uncomment to enable debugging */ |
82 | /* #define TUN_DEBUG 1 */ | |
83 | ||
1da177e4 LT |
84 | #ifdef TUN_DEBUG |
85 | static int debug; | |
14daa021 | 86 | |
6b8a66ee JP |
87 | #define tun_debug(level, tun, fmt, args...) \ |
88 | do { \ | |
89 | if (tun->debug) \ | |
90 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
91 | } while (0) | |
92 | #define DBG1(level, fmt, args...) \ | |
93 | do { \ | |
94 | if (debug == 2) \ | |
95 | printk(level fmt, ##args); \ | |
96 | } while (0) | |
14daa021 | 97 | #else |
6b8a66ee JP |
98 | #define tun_debug(level, tun, fmt, args...) \ |
99 | do { \ | |
100 | if (0) \ | |
101 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
102 | } while (0) | |
103 | #define DBG1(level, fmt, args...) \ | |
104 | do { \ | |
105 | if (0) \ | |
106 | printk(level fmt, ##args); \ | |
107 | } while (0) | |
14daa021 RR |
108 | #endif |
109 | ||
761876c8 | 110 | #define TUN_HEADROOM 256 |
7df13219 | 111 | #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
66ccbc9c | 112 | |
031f5e03 MT |
113 | /* TUN device flags */ |
114 | ||
115 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
116 | * overload it to mean fasync when stored there. | |
117 | */ | |
118 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
119 | /* High bits in flags field are unused. */ |
120 | #define TUN_VNET_LE 0x80000000 | |
8b8e658b | 121 | #define TUN_VNET_BE 0x40000000 |
031f5e03 MT |
122 | |
123 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
1cf8e410 | 124 | IFF_MULTI_QUEUE) |
0690899b MT |
125 | #define GOODCOPY_LEN 128 |
126 | ||
f271b2cc MK |
127 | #define FLT_EXACT_COUNT 8 |
128 | struct tap_filter { | |
129 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
130 | u32 mask[2]; /* Mask of the hashed addrs */ | |
131 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
132 | }; | |
133 | ||
baf71c5c PG |
134 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
135 | * to max number of VCPUs in guest. */ | |
136 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 137 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 138 | |
96442e42 JW |
139 | #define TUN_FLOW_EXPIRE (3 * HZ) |
140 | ||
608b9977 PA |
141 | struct tun_pcpu_stats { |
142 | u64 rx_packets; | |
143 | u64 rx_bytes; | |
144 | u64 tx_packets; | |
145 | u64 tx_bytes; | |
146 | struct u64_stats_sync syncp; | |
147 | u32 rx_dropped; | |
148 | u32 tx_dropped; | |
149 | u32 rx_frame_errors; | |
150 | }; | |
151 | ||
54f968d6 | 152 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 153 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
154 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
155 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 156 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 157 | * this). |
6e914fc7 JW |
158 | * |
159 | * RCU usage: | |
36fe8c09 | 160 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 161 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 162 | */ |
631ab46b | 163 | struct tun_file { |
54f968d6 JW |
164 | struct sock sk; |
165 | struct socket socket; | |
166 | struct socket_wq wq; | |
6e914fc7 | 167 | struct tun_struct __rcu *tun; |
54f968d6 JW |
168 | struct fasync_struct *fasync; |
169 | /* only used for fasnyc */ | |
170 | unsigned int flags; | |
fb7589a1 PE |
171 | union { |
172 | u16 queue_index; | |
173 | unsigned int ifindex; | |
174 | }; | |
4008e97f JW |
175 | struct list_head next; |
176 | struct tun_struct *detached; | |
1576d986 | 177 | struct skb_array tx_array; |
631ab46b EB |
178 | }; |
179 | ||
96442e42 JW |
180 | struct tun_flow_entry { |
181 | struct hlist_node hash_link; | |
182 | struct rcu_head rcu; | |
183 | struct tun_struct *tun; | |
184 | ||
185 | u32 rxhash; | |
9bc88939 | 186 | u32 rps_rxhash; |
96442e42 JW |
187 | int queue_index; |
188 | unsigned long updated; | |
189 | }; | |
190 | ||
191 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
192 | ||
54f968d6 | 193 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 194 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
195 | * file were attached to a persist device. |
196 | */ | |
14daa021 | 197 | struct tun_struct { |
c8d68e6b JW |
198 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
199 | unsigned int numqueues; | |
f271b2cc | 200 | unsigned int flags; |
0625c883 EB |
201 | kuid_t owner; |
202 | kgid_t group; | |
14daa021 | 203 | |
14daa021 | 204 | struct net_device *dev; |
c8f44aff | 205 | netdev_features_t set_features; |
88255375 | 206 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
d591a1f3 | 207 | NETIF_F_TSO6) |
d9d52b51 | 208 | |
eaea34b2 | 209 | int align; |
d9d52b51 | 210 | int vnet_hdr_sz; |
54f968d6 JW |
211 | int sndbuf; |
212 | struct tap_filter txflt; | |
213 | struct sock_fprog fprog; | |
214 | /* protected by rtnl lock */ | |
215 | bool filter_attached; | |
14daa021 RR |
216 | #ifdef TUN_DEBUG |
217 | int debug; | |
1da177e4 | 218 | #endif |
96442e42 | 219 | spinlock_t lock; |
96442e42 JW |
220 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
221 | struct timer_list flow_gc_timer; | |
222 | unsigned long ageing_time; | |
4008e97f JW |
223 | unsigned int numdisabled; |
224 | struct list_head disabled; | |
5dbbaf2d | 225 | void *security; |
b8732fb7 | 226 | u32 flow_count; |
5503fcec | 227 | u32 rx_batched; |
608b9977 | 228 | struct tun_pcpu_stats __percpu *pcpu_stats; |
761876c8 | 229 | struct bpf_prog __rcu *xdp_prog; |
14daa021 | 230 | }; |
1da177e4 | 231 | |
8b8e658b GK |
232 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
233 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
234 | { | |
235 | return tun->flags & TUN_VNET_BE ? false : | |
236 | virtio_legacy_is_little_endian(); | |
237 | } | |
238 | ||
239 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
240 | { | |
241 | int be = !!(tun->flags & TUN_VNET_BE); | |
242 | ||
243 | if (put_user(be, argp)) | |
244 | return -EFAULT; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
250 | { | |
251 | int be; | |
252 | ||
253 | if (get_user(be, argp)) | |
254 | return -EFAULT; | |
255 | ||
256 | if (be) | |
257 | tun->flags |= TUN_VNET_BE; | |
258 | else | |
259 | tun->flags &= ~TUN_VNET_BE; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | #else | |
264 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
265 | { | |
266 | return virtio_legacy_is_little_endian(); | |
267 | } | |
268 | ||
269 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
270 | { | |
271 | return -EINVAL; | |
272 | } | |
273 | ||
274 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
275 | { | |
276 | return -EINVAL; | |
277 | } | |
278 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
279 | ||
25bd55bb GK |
280 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
281 | { | |
7d824109 | 282 | return tun->flags & TUN_VNET_LE || |
8b8e658b | 283 | tun_legacy_is_little_endian(tun); |
25bd55bb GK |
284 | } |
285 | ||
56f0dcc5 MT |
286 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
287 | { | |
25bd55bb | 288 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
289 | } |
290 | ||
291 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
292 | { | |
25bd55bb | 293 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
294 | } |
295 | ||
96442e42 JW |
296 | static inline u32 tun_hashfn(u32 rxhash) |
297 | { | |
298 | return rxhash & 0x3ff; | |
299 | } | |
300 | ||
301 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
302 | { | |
303 | struct tun_flow_entry *e; | |
96442e42 | 304 | |
b67bfe0d | 305 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
306 | if (e->rxhash == rxhash) |
307 | return e; | |
308 | } | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
313 | struct hlist_head *head, | |
314 | u32 rxhash, u16 queue_index) | |
315 | { | |
9fdc6bef ED |
316 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
317 | ||
96442e42 JW |
318 | if (e) { |
319 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
320 | rxhash, queue_index); | |
321 | e->updated = jiffies; | |
322 | e->rxhash = rxhash; | |
9bc88939 | 323 | e->rps_rxhash = 0; |
96442e42 JW |
324 | e->queue_index = queue_index; |
325 | e->tun = tun; | |
326 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 327 | ++tun->flow_count; |
96442e42 JW |
328 | } |
329 | return e; | |
330 | } | |
331 | ||
96442e42 JW |
332 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
333 | { | |
334 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
335 | e->rxhash, e->queue_index); | |
336 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 337 | kfree_rcu(e, rcu); |
b8732fb7 | 338 | --tun->flow_count; |
96442e42 JW |
339 | } |
340 | ||
341 | static void tun_flow_flush(struct tun_struct *tun) | |
342 | { | |
343 | int i; | |
344 | ||
345 | spin_lock_bh(&tun->lock); | |
346 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
347 | struct tun_flow_entry *e; | |
b67bfe0d | 348 | struct hlist_node *n; |
96442e42 | 349 | |
b67bfe0d | 350 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
351 | tun_flow_delete(tun, e); |
352 | } | |
353 | spin_unlock_bh(&tun->lock); | |
354 | } | |
355 | ||
356 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
357 | { | |
358 | int i; | |
359 | ||
360 | spin_lock_bh(&tun->lock); | |
361 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
362 | struct tun_flow_entry *e; | |
b67bfe0d | 363 | struct hlist_node *n; |
96442e42 | 364 | |
b67bfe0d | 365 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
366 | if (e->queue_index == queue_index) |
367 | tun_flow_delete(tun, e); | |
368 | } | |
369 | } | |
370 | spin_unlock_bh(&tun->lock); | |
371 | } | |
372 | ||
373 | static void tun_flow_cleanup(unsigned long data) | |
374 | { | |
375 | struct tun_struct *tun = (struct tun_struct *)data; | |
376 | unsigned long delay = tun->ageing_time; | |
377 | unsigned long next_timer = jiffies + delay; | |
378 | unsigned long count = 0; | |
379 | int i; | |
380 | ||
381 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
382 | ||
383 | spin_lock_bh(&tun->lock); | |
384 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
385 | struct tun_flow_entry *e; | |
b67bfe0d | 386 | struct hlist_node *n; |
96442e42 | 387 | |
b67bfe0d | 388 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
389 | unsigned long this_timer; |
390 | count++; | |
391 | this_timer = e->updated + delay; | |
392 | if (time_before_eq(this_timer, jiffies)) | |
393 | tun_flow_delete(tun, e); | |
394 | else if (time_before(this_timer, next_timer)) | |
395 | next_timer = this_timer; | |
396 | } | |
397 | } | |
398 | ||
399 | if (count) | |
400 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
401 | spin_unlock_bh(&tun->lock); | |
402 | } | |
403 | ||
49974420 | 404 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 405 | struct tun_file *tfile) |
96442e42 JW |
406 | { |
407 | struct hlist_head *head; | |
408 | struct tun_flow_entry *e; | |
409 | unsigned long delay = tun->ageing_time; | |
9e85722d | 410 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
411 | |
412 | if (!rxhash) | |
413 | return; | |
414 | else | |
415 | head = &tun->flows[tun_hashfn(rxhash)]; | |
416 | ||
417 | rcu_read_lock(); | |
418 | ||
9e85722d JW |
419 | /* We may get a very small possibility of OOO during switching, not |
420 | * worth to optimize.*/ | |
421 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
422 | goto unlock; |
423 | ||
424 | e = tun_flow_find(head, rxhash); | |
425 | if (likely(e)) { | |
426 | /* TODO: keep queueing to old queue until it's empty? */ | |
427 | e->queue_index = queue_index; | |
428 | e->updated = jiffies; | |
9bc88939 | 429 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
430 | } else { |
431 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
432 | if (!tun_flow_find(head, rxhash) && |
433 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
434 | tun_flow_create(tun, head, rxhash, queue_index); |
435 | ||
436 | if (!timer_pending(&tun->flow_gc_timer)) | |
437 | mod_timer(&tun->flow_gc_timer, | |
438 | round_jiffies_up(jiffies + delay)); | |
439 | spin_unlock_bh(&tun->lock); | |
440 | } | |
441 | ||
442 | unlock: | |
443 | rcu_read_unlock(); | |
444 | } | |
445 | ||
9bc88939 TH |
446 | /** |
447 | * Save the hash received in the stack receive path and update the | |
448 | * flow_hash table accordingly. | |
449 | */ | |
450 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
451 | { | |
567e4b79 | 452 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 453 | e->rps_rxhash = hash; |
9bc88939 TH |
454 | } |
455 | ||
c8d68e6b | 456 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 457 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
458 | * the rxq based on the txq where the last packet of the flow comes. As |
459 | * the userspace application move between processors, we may get a | |
460 | * different rxq no. here. If we could not get rxhash, then we would | |
461 | * hope the rxq no. may help here. | |
462 | */ | |
f663dd9a | 463 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
99932d4f | 464 | void *accel_priv, select_queue_fallback_t fallback) |
c8d68e6b JW |
465 | { |
466 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 467 | struct tun_flow_entry *e; |
c8d68e6b JW |
468 | u32 txq = 0; |
469 | u32 numqueues = 0; | |
470 | ||
471 | rcu_read_lock(); | |
92bb73ea | 472 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 473 | |
feec084a | 474 | txq = __skb_get_hash_symmetric(skb); |
c8d68e6b | 475 | if (txq) { |
96442e42 | 476 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 477 | if (e) { |
9bc88939 | 478 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 479 | txq = e->queue_index; |
9bc88939 | 480 | } else |
96442e42 JW |
481 | /* use multiply and shift instead of expensive divide */ |
482 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
483 | } else if (likely(skb_rx_queue_recorded(skb))) { |
484 | txq = skb_get_rx_queue(skb); | |
485 | while (unlikely(txq >= numqueues)) | |
486 | txq -= numqueues; | |
487 | } | |
488 | ||
489 | rcu_read_unlock(); | |
490 | return txq; | |
491 | } | |
492 | ||
cde8b15f JW |
493 | static inline bool tun_not_capable(struct tun_struct *tun) |
494 | { | |
495 | const struct cred *cred = current_cred(); | |
c260b772 | 496 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
497 | |
498 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
499 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 500 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
501 | } |
502 | ||
c8d68e6b JW |
503 | static void tun_set_real_num_queues(struct tun_struct *tun) |
504 | { | |
505 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
506 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
507 | } | |
508 | ||
4008e97f JW |
509 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
510 | { | |
511 | tfile->detached = tun; | |
512 | list_add_tail(&tfile->next, &tun->disabled); | |
513 | ++tun->numdisabled; | |
514 | } | |
515 | ||
d32649d1 | 516 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
517 | { |
518 | struct tun_struct *tun = tfile->detached; | |
519 | ||
520 | tfile->detached = NULL; | |
521 | list_del_init(&tfile->next); | |
522 | --tun->numdisabled; | |
523 | return tun; | |
524 | } | |
525 | ||
4bfb0513 JW |
526 | static void tun_queue_purge(struct tun_file *tfile) |
527 | { | |
1576d986 JW |
528 | struct sk_buff *skb; |
529 | ||
530 | while ((skb = skb_array_consume(&tfile->tx_array)) != NULL) | |
531 | kfree_skb(skb); | |
532 | ||
5503fcec | 533 | skb_queue_purge(&tfile->sk.sk_write_queue); |
4bfb0513 JW |
534 | skb_queue_purge(&tfile->sk.sk_error_queue); |
535 | } | |
536 | ||
c8d68e6b JW |
537 | static void __tun_detach(struct tun_file *tfile, bool clean) |
538 | { | |
539 | struct tun_file *ntfile; | |
540 | struct tun_struct *tun; | |
c8d68e6b | 541 | |
b8deabd3 JW |
542 | tun = rtnl_dereference(tfile->tun); |
543 | ||
9e85722d | 544 | if (tun && !tfile->detached) { |
c8d68e6b JW |
545 | u16 index = tfile->queue_index; |
546 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
547 | |
548 | rcu_assign_pointer(tun->tfiles[index], | |
549 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 550 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
551 | ntfile->queue_index = index; |
552 | ||
553 | --tun->numqueues; | |
9e85722d | 554 | if (clean) { |
c956674b | 555 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 556 | sock_put(&tfile->sk); |
9e85722d | 557 | } else |
4008e97f | 558 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
559 | |
560 | synchronize_net(); | |
96442e42 | 561 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 562 | /* Drop read queue */ |
4bfb0513 | 563 | tun_queue_purge(tfile); |
c8d68e6b | 564 | tun_set_real_num_queues(tun); |
dd38bd85 | 565 | } else if (tfile->detached && clean) { |
4008e97f | 566 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
567 | sock_put(&tfile->sk); |
568 | } | |
c8d68e6b JW |
569 | |
570 | if (clean) { | |
af668b3c MT |
571 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
572 | netif_carrier_off(tun->dev); | |
573 | ||
40630b82 | 574 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 575 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 576 | unregister_netdevice(tun->dev); |
af668b3c | 577 | } |
1576d986 JW |
578 | if (tun) |
579 | skb_array_cleanup(&tfile->tx_array); | |
140e807d | 580 | sock_put(&tfile->sk); |
c8d68e6b JW |
581 | } |
582 | } | |
583 | ||
584 | static void tun_detach(struct tun_file *tfile, bool clean) | |
585 | { | |
586 | rtnl_lock(); | |
587 | __tun_detach(tfile, clean); | |
588 | rtnl_unlock(); | |
589 | } | |
590 | ||
591 | static void tun_detach_all(struct net_device *dev) | |
592 | { | |
593 | struct tun_struct *tun = netdev_priv(dev); | |
761876c8 | 594 | struct bpf_prog *xdp_prog = rtnl_dereference(tun->xdp_prog); |
4008e97f | 595 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
596 | int i, n = tun->numqueues; |
597 | ||
598 | for (i = 0; i < n; i++) { | |
b8deabd3 | 599 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 600 | BUG_ON(!tfile); |
addf8fc4 | 601 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 602 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 603 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
604 | --tun->numqueues; |
605 | } | |
9e85722d | 606 | list_for_each_entry(tfile, &tun->disabled, next) { |
addf8fc4 | 607 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 608 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 609 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 610 | } |
c8d68e6b JW |
611 | BUG_ON(tun->numqueues != 0); |
612 | ||
613 | synchronize_net(); | |
614 | for (i = 0; i < n; i++) { | |
b8deabd3 | 615 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 616 | /* Drop read queue */ |
4bfb0513 | 617 | tun_queue_purge(tfile); |
c8d68e6b JW |
618 | sock_put(&tfile->sk); |
619 | } | |
4008e97f JW |
620 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
621 | tun_enable_queue(tfile); | |
4bfb0513 | 622 | tun_queue_purge(tfile); |
4008e97f JW |
623 | sock_put(&tfile->sk); |
624 | } | |
625 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 626 | |
761876c8 JW |
627 | if (xdp_prog) |
628 | bpf_prog_put(xdp_prog); | |
629 | ||
40630b82 | 630 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 631 | module_put(THIS_MODULE); |
c8d68e6b JW |
632 | } |
633 | ||
849c9b6f | 634 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 635 | { |
631ab46b | 636 | struct tun_file *tfile = file->private_data; |
1576d986 | 637 | struct net_device *dev = tun->dev; |
38231b7a | 638 | int err; |
a7385ba2 | 639 | |
5dbbaf2d PM |
640 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
641 | if (err < 0) | |
642 | goto out; | |
643 | ||
38231b7a | 644 | err = -EINVAL; |
9e85722d | 645 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
646 | goto out; |
647 | ||
648 | err = -EBUSY; | |
40630b82 | 649 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
650 | goto out; |
651 | ||
652 | err = -E2BIG; | |
4008e97f JW |
653 | if (!tfile->detached && |
654 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
655 | goto out; |
656 | ||
657 | err = 0; | |
54f968d6 | 658 | |
92d4ea6e | 659 | /* Re-attach the filter to persist device */ |
849c9b6f | 660 | if (!skip_filter && (tun->filter_attached == true)) { |
8ced425e HFS |
661 | lock_sock(tfile->socket.sk); |
662 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
663 | release_sock(tfile->socket.sk); | |
54f968d6 JW |
664 | if (!err) |
665 | goto out; | |
666 | } | |
1576d986 JW |
667 | |
668 | if (!tfile->detached && | |
669 | skb_array_init(&tfile->tx_array, dev->tx_queue_len, GFP_KERNEL)) { | |
670 | err = -ENOMEM; | |
671 | goto out; | |
672 | } | |
673 | ||
c8d68e6b | 674 | tfile->queue_index = tun->numqueues; |
addf8fc4 | 675 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
6e914fc7 | 676 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 677 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 678 | tun->numqueues++; |
a7385ba2 | 679 | |
4008e97f JW |
680 | if (tfile->detached) |
681 | tun_enable_queue(tfile); | |
682 | else | |
683 | sock_hold(&tfile->sk); | |
684 | ||
c8d68e6b | 685 | tun_set_real_num_queues(tun); |
a7385ba2 | 686 | |
c8d68e6b JW |
687 | /* device is allowed to go away first, so no need to hold extra |
688 | * refcnt. | |
689 | */ | |
690 | ||
691 | out: | |
692 | return err; | |
631ab46b EB |
693 | } |
694 | ||
695 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
696 | { | |
6e914fc7 | 697 | struct tun_struct *tun; |
c70f1829 | 698 | |
6e914fc7 JW |
699 | rcu_read_lock(); |
700 | tun = rcu_dereference(tfile->tun); | |
701 | if (tun) | |
702 | dev_hold(tun->dev); | |
703 | rcu_read_unlock(); | |
c70f1829 EB |
704 | |
705 | return tun; | |
631ab46b EB |
706 | } |
707 | ||
708 | static struct tun_struct *tun_get(struct file *file) | |
709 | { | |
710 | return __tun_get(file->private_data); | |
711 | } | |
712 | ||
713 | static void tun_put(struct tun_struct *tun) | |
714 | { | |
6e914fc7 | 715 | dev_put(tun->dev); |
631ab46b EB |
716 | } |
717 | ||
6b8a66ee | 718 | /* TAP filtering */ |
f271b2cc MK |
719 | static void addr_hash_set(u32 *mask, const u8 *addr) |
720 | { | |
721 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
722 | mask[n >> 5] |= (1 << (n & 31)); | |
723 | } | |
724 | ||
725 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
726 | { | |
727 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
728 | return mask[n >> 5] & (1 << (n & 31)); | |
729 | } | |
730 | ||
731 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
732 | { | |
733 | struct { u8 u[ETH_ALEN]; } *addr; | |
734 | struct tun_filter uf; | |
735 | int err, alen, n, nexact; | |
736 | ||
737 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
738 | return -EFAULT; | |
739 | ||
740 | if (!uf.count) { | |
741 | /* Disabled */ | |
742 | filter->count = 0; | |
743 | return 0; | |
744 | } | |
745 | ||
746 | alen = ETH_ALEN * uf.count; | |
28e8190d ME |
747 | addr = memdup_user(arg + sizeof(uf), alen); |
748 | if (IS_ERR(addr)) | |
749 | return PTR_ERR(addr); | |
f271b2cc MK |
750 | |
751 | /* The filter is updated without holding any locks. Which is | |
752 | * perfectly safe. We disable it first and in the worst | |
753 | * case we'll accept a few undesired packets. */ | |
754 | filter->count = 0; | |
755 | wmb(); | |
756 | ||
757 | /* Use first set of addresses as an exact filter */ | |
758 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
759 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
760 | ||
761 | nexact = n; | |
762 | ||
cfbf84fc AW |
763 | /* Remaining multicast addresses are hashed, |
764 | * unicast will leave the filter disabled. */ | |
f271b2cc | 765 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
766 | for (; n < uf.count; n++) { |
767 | if (!is_multicast_ether_addr(addr[n].u)) { | |
768 | err = 0; /* no filter */ | |
3b8d2a69 | 769 | goto free_addr; |
cfbf84fc | 770 | } |
f271b2cc | 771 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 772 | } |
f271b2cc MK |
773 | |
774 | /* For ALLMULTI just set the mask to all ones. | |
775 | * This overrides the mask populated above. */ | |
776 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
777 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
778 | ||
779 | /* Now enable the filter */ | |
780 | wmb(); | |
781 | filter->count = nexact; | |
782 | ||
783 | /* Return the number of exact filters */ | |
784 | err = nexact; | |
3b8d2a69 | 785 | free_addr: |
f271b2cc MK |
786 | kfree(addr); |
787 | return err; | |
788 | } | |
789 | ||
790 | /* Returns: 0 - drop, !=0 - accept */ | |
791 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
792 | { | |
793 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
794 | * at this point. */ | |
795 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
796 | int i; | |
797 | ||
798 | /* Exact match */ | |
799 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 800 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
801 | return 1; |
802 | ||
803 | /* Inexact match (multicast only) */ | |
804 | if (is_multicast_ether_addr(eh->h_dest)) | |
805 | return addr_hash_test(filter->mask, eh->h_dest); | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
810 | /* | |
811 | * Checks whether the packet is accepted or not. | |
812 | * Returns: 0 - drop, !=0 - accept | |
813 | */ | |
814 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
815 | { | |
816 | if (!filter->count) | |
817 | return 1; | |
818 | ||
819 | return run_filter(filter, skb); | |
820 | } | |
821 | ||
1da177e4 LT |
822 | /* Network device part of the driver */ |
823 | ||
7282d491 | 824 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 825 | |
c70f1829 EB |
826 | /* Net device detach from fd. */ |
827 | static void tun_net_uninit(struct net_device *dev) | |
828 | { | |
c8d68e6b | 829 | tun_detach_all(dev); |
c70f1829 EB |
830 | } |
831 | ||
1da177e4 LT |
832 | /* Net device open. */ |
833 | static int tun_net_open(struct net_device *dev) | |
834 | { | |
b20e2d54 HFS |
835 | struct tun_struct *tun = netdev_priv(dev); |
836 | int i; | |
837 | ||
c8d68e6b | 838 | netif_tx_start_all_queues(dev); |
b20e2d54 HFS |
839 | |
840 | for (i = 0; i < tun->numqueues; i++) { | |
841 | struct tun_file *tfile; | |
842 | ||
843 | tfile = rtnl_dereference(tun->tfiles[i]); | |
844 | tfile->socket.sk->sk_write_space(tfile->socket.sk); | |
845 | } | |
846 | ||
1da177e4 LT |
847 | return 0; |
848 | } | |
849 | ||
850 | /* Net device close. */ | |
851 | static int tun_net_close(struct net_device *dev) | |
852 | { | |
c8d68e6b | 853 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
854 | return 0; |
855 | } | |
856 | ||
857 | /* Net device start xmit */ | |
424efe9c | 858 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
859 | { |
860 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 861 | int txq = skb->queue_mapping; |
6e914fc7 | 862 | struct tun_file *tfile; |
fa35864e | 863 | u32 numqueues = 0; |
1da177e4 | 864 | |
6e914fc7 | 865 | rcu_read_lock(); |
c8d68e6b | 866 | tfile = rcu_dereference(tun->tfiles[txq]); |
fa35864e | 867 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 868 | |
1da177e4 | 869 | /* Drop packet if interface is not attached */ |
fa35864e | 870 | if (txq >= numqueues) |
1da177e4 LT |
871 | goto drop; |
872 | ||
3df97ba8 JW |
873 | #ifdef CONFIG_RPS |
874 | if (numqueues == 1 && static_key_false(&rps_needed)) { | |
9bc88939 TH |
875 | /* Select queue was not called for the skbuff, so we extract the |
876 | * RPS hash and save it into the flow_table here. | |
877 | */ | |
878 | __u32 rxhash; | |
879 | ||
feec084a | 880 | rxhash = __skb_get_hash_symmetric(skb); |
9bc88939 TH |
881 | if (rxhash) { |
882 | struct tun_flow_entry *e; | |
883 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
884 | rxhash); | |
885 | if (e) | |
886 | tun_flow_save_rps_rxhash(e, rxhash); | |
887 | } | |
888 | } | |
3df97ba8 | 889 | #endif |
9bc88939 | 890 | |
6e914fc7 JW |
891 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
892 | ||
c8d68e6b JW |
893 | BUG_ON(!tfile); |
894 | ||
f271b2cc MK |
895 | /* Drop if the filter does not like it. |
896 | * This is a noop if the filter is disabled. | |
897 | * Filter can be enabled only for the TAP devices. */ | |
898 | if (!check_filter(&tun->txflt, skb)) | |
899 | goto drop; | |
900 | ||
54f968d6 JW |
901 | if (tfile->socket.sk->sk_filter && |
902 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
903 | goto drop; |
904 | ||
1f8b977a | 905 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
7bf66305 JW |
906 | goto drop; |
907 | ||
7b996243 | 908 | skb_tx_timestamp(skb); |
eda29772 | 909 | |
0110d6f2 | 910 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
911 | * for indefinite time. |
912 | */ | |
0110d6f2 MT |
913 | skb_orphan(skb); |
914 | ||
f8af75f3 ED |
915 | nf_reset(skb); |
916 | ||
1576d986 JW |
917 | if (skb_array_produce(&tfile->tx_array, skb)) |
918 | goto drop; | |
1da177e4 LT |
919 | |
920 | /* Notify and wake up reader process */ | |
54f968d6 JW |
921 | if (tfile->flags & TUN_FASYNC) |
922 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 923 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
924 | |
925 | rcu_read_unlock(); | |
6ed10654 | 926 | return NETDEV_TX_OK; |
1da177e4 LT |
927 | |
928 | drop: | |
608b9977 | 929 | this_cpu_inc(tun->pcpu_stats->tx_dropped); |
149d36f7 | 930 | skb_tx_error(skb); |
1da177e4 | 931 | kfree_skb(skb); |
6e914fc7 | 932 | rcu_read_unlock(); |
baeababb | 933 | return NET_XMIT_DROP; |
1da177e4 LT |
934 | } |
935 | ||
f271b2cc | 936 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 937 | { |
f271b2cc MK |
938 | /* |
939 | * This callback is supposed to deal with mc filter in | |
940 | * _rx_ path and has nothing to do with the _tx_ path. | |
941 | * In rx path we always accept everything userspace gives us. | |
942 | */ | |
1da177e4 LT |
943 | } |
944 | ||
c8f44aff MM |
945 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
946 | netdev_features_t features) | |
88255375 MM |
947 | { |
948 | struct tun_struct *tun = netdev_priv(dev); | |
949 | ||
950 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
951 | } | |
bebd097a NH |
952 | #ifdef CONFIG_NET_POLL_CONTROLLER |
953 | static void tun_poll_controller(struct net_device *dev) | |
954 | { | |
955 | /* | |
956 | * Tun only receives frames when: | |
957 | * 1) the char device endpoint gets data from user space | |
958 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 959 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 960 | * never to have pending data when we poll for it |
92d4ea6e | 961 | * so there is nothing to do here but return. |
bebd097a NH |
962 | * We need this though so netpoll recognizes us as an interface that |
963 | * supports polling, which enables bridge devices in virt setups to | |
964 | * still use netconsole | |
965 | */ | |
966 | return; | |
967 | } | |
968 | #endif | |
eaea34b2 PA |
969 | |
970 | static void tun_set_headroom(struct net_device *dev, int new_hr) | |
971 | { | |
972 | struct tun_struct *tun = netdev_priv(dev); | |
973 | ||
974 | if (new_hr < NET_SKB_PAD) | |
975 | new_hr = NET_SKB_PAD; | |
976 | ||
977 | tun->align = new_hr; | |
978 | } | |
979 | ||
bc1f4470 | 980 | static void |
608b9977 PA |
981 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
982 | { | |
983 | u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; | |
984 | struct tun_struct *tun = netdev_priv(dev); | |
985 | struct tun_pcpu_stats *p; | |
986 | int i; | |
987 | ||
988 | for_each_possible_cpu(i) { | |
989 | u64 rxpackets, rxbytes, txpackets, txbytes; | |
990 | unsigned int start; | |
991 | ||
992 | p = per_cpu_ptr(tun->pcpu_stats, i); | |
993 | do { | |
994 | start = u64_stats_fetch_begin(&p->syncp); | |
995 | rxpackets = p->rx_packets; | |
996 | rxbytes = p->rx_bytes; | |
997 | txpackets = p->tx_packets; | |
998 | txbytes = p->tx_bytes; | |
999 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
1000 | ||
1001 | stats->rx_packets += rxpackets; | |
1002 | stats->rx_bytes += rxbytes; | |
1003 | stats->tx_packets += txpackets; | |
1004 | stats->tx_bytes += txbytes; | |
1005 | ||
1006 | /* u32 counters */ | |
1007 | rx_dropped += p->rx_dropped; | |
1008 | rx_frame_errors += p->rx_frame_errors; | |
1009 | tx_dropped += p->tx_dropped; | |
1010 | } | |
1011 | stats->rx_dropped = rx_dropped; | |
1012 | stats->rx_frame_errors = rx_frame_errors; | |
1013 | stats->tx_dropped = tx_dropped; | |
608b9977 PA |
1014 | } |
1015 | ||
761876c8 JW |
1016 | static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1017 | struct netlink_ext_ack *extack) | |
1018 | { | |
1019 | struct tun_struct *tun = netdev_priv(dev); | |
1020 | struct bpf_prog *old_prog; | |
1021 | ||
1022 | old_prog = rtnl_dereference(tun->xdp_prog); | |
1023 | rcu_assign_pointer(tun->xdp_prog, prog); | |
1024 | if (old_prog) | |
1025 | bpf_prog_put(old_prog); | |
1026 | ||
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static u32 tun_xdp_query(struct net_device *dev) | |
1031 | { | |
1032 | struct tun_struct *tun = netdev_priv(dev); | |
1033 | const struct bpf_prog *xdp_prog; | |
1034 | ||
1035 | xdp_prog = rtnl_dereference(tun->xdp_prog); | |
1036 | if (xdp_prog) | |
1037 | return xdp_prog->aux->id; | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | static int tun_xdp(struct net_device *dev, struct netdev_xdp *xdp) | |
1043 | { | |
1044 | switch (xdp->command) { | |
1045 | case XDP_SETUP_PROG: | |
1046 | return tun_xdp_set(dev, xdp->prog, xdp->extack); | |
1047 | case XDP_QUERY_PROG: | |
1048 | xdp->prog_id = tun_xdp_query(dev); | |
1049 | xdp->prog_attached = !!xdp->prog_id; | |
1050 | return 0; | |
1051 | default: | |
1052 | return -EINVAL; | |
1053 | } | |
1054 | } | |
1055 | ||
758e43b7 | 1056 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 1057 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1058 | .ndo_open = tun_net_open, |
1059 | .ndo_stop = tun_net_close, | |
00829823 | 1060 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1061 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 1062 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1063 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1064 | .ndo_poll_controller = tun_poll_controller, | |
1065 | #endif | |
eaea34b2 | 1066 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1067 | .ndo_get_stats64 = tun_net_get_stats64, |
758e43b7 SH |
1068 | }; |
1069 | ||
1070 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 1071 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1072 | .ndo_open = tun_net_open, |
1073 | .ndo_stop = tun_net_close, | |
00829823 | 1074 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1075 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 1076 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
1077 | .ndo_set_mac_address = eth_mac_addr, |
1078 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 1079 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1080 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1081 | .ndo_poll_controller = tun_poll_controller, | |
1082 | #endif | |
5e52796a | 1083 | .ndo_features_check = passthru_features_check, |
eaea34b2 | 1084 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1085 | .ndo_get_stats64 = tun_net_get_stats64, |
761876c8 | 1086 | .ndo_xdp = tun_xdp, |
758e43b7 SH |
1087 | }; |
1088 | ||
944a1376 | 1089 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
1090 | { |
1091 | int i; | |
1092 | ||
96442e42 JW |
1093 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
1094 | INIT_HLIST_HEAD(&tun->flows[i]); | |
1095 | ||
1096 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
1097 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
1098 | mod_timer(&tun->flow_gc_timer, | |
1099 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
1100 | } |
1101 | ||
1102 | static void tun_flow_uninit(struct tun_struct *tun) | |
1103 | { | |
1104 | del_timer_sync(&tun->flow_gc_timer); | |
1105 | tun_flow_flush(tun); | |
96442e42 JW |
1106 | } |
1107 | ||
91572088 JW |
1108 | #define MIN_MTU 68 |
1109 | #define MAX_MTU 65535 | |
1110 | ||
1da177e4 LT |
1111 | /* Initialize net device. */ |
1112 | static void tun_net_init(struct net_device *dev) | |
1113 | { | |
1114 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 1115 | |
1da177e4 | 1116 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 1117 | case IFF_TUN: |
758e43b7 SH |
1118 | dev->netdev_ops = &tun_netdev_ops; |
1119 | ||
1da177e4 LT |
1120 | /* Point-to-Point TUN Device */ |
1121 | dev->hard_header_len = 0; | |
1122 | dev->addr_len = 0; | |
1123 | dev->mtu = 1500; | |
1124 | ||
1125 | /* Zero header length */ | |
6aa20a22 | 1126 | dev->type = ARPHRD_NONE; |
1da177e4 | 1127 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
1da177e4 LT |
1128 | break; |
1129 | ||
40630b82 | 1130 | case IFF_TAP: |
7a0a9608 | 1131 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 1132 | /* Ethernet TAP Device */ |
1da177e4 | 1133 | ether_setup(dev); |
550fd08c | 1134 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 1135 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 1136 | |
f2cedb63 | 1137 | eth_hw_addr_random(dev); |
36226a8d | 1138 | |
1da177e4 LT |
1139 | break; |
1140 | } | |
91572088 JW |
1141 | |
1142 | dev->min_mtu = MIN_MTU; | |
1143 | dev->max_mtu = MAX_MTU - dev->hard_header_len; | |
1da177e4 LT |
1144 | } |
1145 | ||
1146 | /* Character device part */ | |
1147 | ||
1148 | /* Poll */ | |
c8d68e6b | 1149 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 1150 | { |
b2430de3 EB |
1151 | struct tun_file *tfile = file->private_data; |
1152 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 1153 | struct sock *sk; |
33dccbb0 | 1154 | unsigned int mask = 0; |
1da177e4 LT |
1155 | |
1156 | if (!tun) | |
eac9e902 | 1157 | return POLLERR; |
1da177e4 | 1158 | |
54f968d6 | 1159 | sk = tfile->socket.sk; |
3c8a9c63 | 1160 | |
6b8a66ee | 1161 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 1162 | |
9e641bdc | 1163 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 1164 | |
1576d986 | 1165 | if (!skb_array_empty(&tfile->tx_array)) |
1da177e4 LT |
1166 | mask |= POLLIN | POLLRDNORM; |
1167 | ||
b20e2d54 HFS |
1168 | if (tun->dev->flags & IFF_UP && |
1169 | (sock_writeable(sk) || | |
1170 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
1171 | sock_writeable(sk)))) | |
33dccbb0 HX |
1172 | mask |= POLLOUT | POLLWRNORM; |
1173 | ||
c70f1829 EB |
1174 | if (tun->dev->reg_state != NETREG_REGISTERED) |
1175 | mask = POLLERR; | |
1176 | ||
631ab46b | 1177 | tun_put(tun); |
1da177e4 LT |
1178 | return mask; |
1179 | } | |
1180 | ||
f42157cb RR |
1181 | /* prepad is the amount to reserve at front. len is length after that. |
1182 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1183 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1184 | size_t prepad, size_t len, |
1185 | size_t linear, int noblock) | |
f42157cb | 1186 | { |
54f968d6 | 1187 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1188 | struct sk_buff *skb; |
33dccbb0 | 1189 | int err; |
f42157cb RR |
1190 | |
1191 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1192 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1193 | linear = len; |
f42157cb | 1194 | |
33dccbb0 | 1195 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1196 | &err, 0); |
f42157cb | 1197 | if (!skb) |
33dccbb0 | 1198 | return ERR_PTR(err); |
f42157cb RR |
1199 | |
1200 | skb_reserve(skb, prepad); | |
1201 | skb_put(skb, linear); | |
33dccbb0 HX |
1202 | skb->data_len = len - linear; |
1203 | skb->len += len - linear; | |
f42157cb RR |
1204 | |
1205 | return skb; | |
1206 | } | |
1207 | ||
5503fcec JW |
1208 | static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile, |
1209 | struct sk_buff *skb, int more) | |
1210 | { | |
1211 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
1212 | struct sk_buff_head process_queue; | |
1213 | u32 rx_batched = tun->rx_batched; | |
1214 | bool rcv = false; | |
1215 | ||
1216 | if (!rx_batched || (!more && skb_queue_empty(queue))) { | |
1217 | local_bh_disable(); | |
1218 | netif_receive_skb(skb); | |
1219 | local_bh_enable(); | |
1220 | return; | |
1221 | } | |
1222 | ||
1223 | spin_lock(&queue->lock); | |
1224 | if (!more || skb_queue_len(queue) == rx_batched) { | |
1225 | __skb_queue_head_init(&process_queue); | |
1226 | skb_queue_splice_tail_init(queue, &process_queue); | |
1227 | rcv = true; | |
1228 | } else { | |
1229 | __skb_queue_tail(queue, skb); | |
1230 | } | |
1231 | spin_unlock(&queue->lock); | |
1232 | ||
1233 | if (rcv) { | |
1234 | struct sk_buff *nskb; | |
1235 | ||
1236 | local_bh_disable(); | |
1237 | while ((nskb = __skb_dequeue(&process_queue))) | |
1238 | netif_receive_skb(nskb); | |
1239 | netif_receive_skb(skb); | |
1240 | local_bh_enable(); | |
1241 | } | |
1242 | } | |
1243 | ||
66ccbc9c JW |
1244 | static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, |
1245 | int len, int noblock, bool zerocopy) | |
1246 | { | |
1247 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) | |
1248 | return false; | |
1249 | ||
1250 | if (tfile->socket.sk->sk_sndbuf != INT_MAX) | |
1251 | return false; | |
1252 | ||
1253 | if (!noblock) | |
1254 | return false; | |
1255 | ||
1256 | if (zerocopy) | |
1257 | return false; | |
1258 | ||
1259 | if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + | |
1260 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
1261 | return false; | |
1262 | ||
1263 | return true; | |
1264 | } | |
1265 | ||
761876c8 JW |
1266 | static struct sk_buff *tun_build_skb(struct tun_struct *tun, |
1267 | struct tun_file *tfile, | |
66ccbc9c | 1268 | struct iov_iter *from, |
761876c8 | 1269 | struct virtio_net_hdr *hdr, |
1cfe6e93 | 1270 | int len, int *skb_xdp) |
66ccbc9c | 1271 | { |
0bbd7dad | 1272 | struct page_frag *alloc_frag = ¤t->task_frag; |
66ccbc9c | 1273 | struct sk_buff *skb; |
761876c8 | 1274 | struct bpf_prog *xdp_prog; |
7df13219 | 1275 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
761876c8 | 1276 | unsigned int delta = 0; |
66ccbc9c JW |
1277 | char *buf; |
1278 | size_t copied; | |
761876c8 | 1279 | bool xdp_xmit = false; |
7df13219 JW |
1280 | int err, pad = TUN_RX_PAD; |
1281 | ||
1282 | rcu_read_lock(); | |
1283 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1284 | if (xdp_prog) | |
1285 | pad += TUN_HEADROOM; | |
1286 | buflen += SKB_DATA_ALIGN(len + pad); | |
1287 | rcu_read_unlock(); | |
66ccbc9c JW |
1288 | |
1289 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) | |
1290 | return ERR_PTR(-ENOMEM); | |
1291 | ||
1292 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
1293 | copied = copy_page_from_iter(alloc_frag->page, | |
7df13219 | 1294 | alloc_frag->offset + pad, |
66ccbc9c JW |
1295 | len, from); |
1296 | if (copied != len) | |
1297 | return ERR_PTR(-EFAULT); | |
1298 | ||
7df13219 JW |
1299 | /* There's a small window that XDP may be set after the check |
1300 | * of xdp_prog above, this should be rare and for simplicity | |
1301 | * we do XDP on skb in case the headroom is not enough. | |
1302 | */ | |
1303 | if (hdr->gso_type || !xdp_prog) | |
1cfe6e93 | 1304 | *skb_xdp = 1; |
761876c8 | 1305 | else |
1cfe6e93 | 1306 | *skb_xdp = 0; |
761876c8 JW |
1307 | |
1308 | rcu_read_lock(); | |
1309 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1cfe6e93 | 1310 | if (xdp_prog && !*skb_xdp) { |
761876c8 JW |
1311 | struct xdp_buff xdp; |
1312 | void *orig_data; | |
1313 | u32 act; | |
1314 | ||
1315 | xdp.data_hard_start = buf; | |
7df13219 | 1316 | xdp.data = buf + pad; |
761876c8 JW |
1317 | xdp.data_end = xdp.data + len; |
1318 | orig_data = xdp.data; | |
1319 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
1320 | ||
1321 | switch (act) { | |
1322 | case XDP_REDIRECT: | |
1323 | get_page(alloc_frag->page); | |
1324 | alloc_frag->offset += buflen; | |
1325 | err = xdp_do_redirect(tun->dev, &xdp, xdp_prog); | |
1326 | if (err) | |
1327 | goto err_redirect; | |
1328 | return NULL; | |
1329 | case XDP_TX: | |
1330 | xdp_xmit = true; | |
1331 | /* fall through */ | |
1332 | case XDP_PASS: | |
1333 | delta = orig_data - xdp.data; | |
1334 | break; | |
1335 | default: | |
1336 | bpf_warn_invalid_xdp_action(act); | |
1337 | /* fall through */ | |
1338 | case XDP_ABORTED: | |
1339 | trace_xdp_exception(tun->dev, xdp_prog, act); | |
1340 | /* fall through */ | |
1341 | case XDP_DROP: | |
1342 | goto err_xdp; | |
1343 | } | |
1344 | } | |
1345 | ||
66ccbc9c | 1346 | skb = build_skb(buf, buflen); |
761876c8 JW |
1347 | if (!skb) { |
1348 | rcu_read_unlock(); | |
66ccbc9c | 1349 | return ERR_PTR(-ENOMEM); |
761876c8 | 1350 | } |
66ccbc9c | 1351 | |
7df13219 | 1352 | skb_reserve(skb, pad - delta); |
761876c8 | 1353 | skb_put(skb, len + delta); |
66ccbc9c JW |
1354 | get_page(alloc_frag->page); |
1355 | alloc_frag->offset += buflen; | |
1356 | ||
761876c8 JW |
1357 | if (xdp_xmit) { |
1358 | skb->dev = tun->dev; | |
1359 | generic_xdp_tx(skb, xdp_prog); | |
1360 | rcu_read_lock(); | |
1361 | return NULL; | |
1362 | } | |
1363 | ||
1364 | rcu_read_unlock(); | |
1365 | ||
66ccbc9c | 1366 | return skb; |
761876c8 JW |
1367 | |
1368 | err_redirect: | |
1369 | put_page(alloc_frag->page); | |
1370 | err_xdp: | |
1371 | rcu_read_unlock(); | |
1372 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1373 | return NULL; | |
66ccbc9c JW |
1374 | } |
1375 | ||
1da177e4 | 1376 | /* Get packet from user space buffer */ |
54f968d6 | 1377 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 | 1378 | void *msg_control, struct iov_iter *from, |
5503fcec | 1379 | int noblock, bool more) |
1da177e4 | 1380 | { |
09640e63 | 1381 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1382 | struct sk_buff *skb; |
f5ff53b4 | 1383 | size_t total_len = iov_iter_count(from); |
eaea34b2 | 1384 | size_t len = total_len, align = tun->align, linear; |
f43798c2 | 1385 | struct virtio_net_hdr gso = { 0 }; |
608b9977 | 1386 | struct tun_pcpu_stats *stats; |
96f8d9ec | 1387 | int good_linear; |
0690899b MT |
1388 | int copylen; |
1389 | bool zerocopy = false; | |
1390 | int err; | |
49974420 | 1391 | u32 rxhash; |
1cfe6e93 | 1392 | int skb_xdp = 1; |
1da177e4 | 1393 | |
1bd4978a ED |
1394 | if (!(tun->dev->flags & IFF_UP)) |
1395 | return -EIO; | |
1396 | ||
40630b82 | 1397 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1398 | if (len < sizeof(pi)) |
1da177e4 | 1399 | return -EINVAL; |
15718ea0 | 1400 | len -= sizeof(pi); |
1da177e4 | 1401 | |
cbbd26b8 | 1402 | if (!copy_from_iter_full(&pi, sizeof(pi), from)) |
1da177e4 LT |
1403 | return -EFAULT; |
1404 | } | |
1405 | ||
40630b82 | 1406 | if (tun->flags & IFF_VNET_HDR) { |
e1edab87 WB |
1407 | int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1408 | ||
1409 | if (len < vnet_hdr_sz) | |
f43798c2 | 1410 | return -EINVAL; |
e1edab87 | 1411 | len -= vnet_hdr_sz; |
f43798c2 | 1412 | |
cbbd26b8 | 1413 | if (!copy_from_iter_full(&gso, sizeof(gso), from)) |
f43798c2 RR |
1414 | return -EFAULT; |
1415 | ||
4909122f | 1416 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1417 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1418 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1419 | |
56f0dcc5 | 1420 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1421 | return -EINVAL; |
e1edab87 | 1422 | iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1423 | } |
1424 | ||
40630b82 | 1425 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1426 | align += NET_IP_ALIGN; |
0eca93bc | 1427 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1428 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1429 | return -EINVAL; |
1430 | } | |
6aa20a22 | 1431 | |
96f8d9ec JW |
1432 | good_linear = SKB_MAX_HEAD(align); |
1433 | ||
88529176 | 1434 | if (msg_control) { |
f5ff53b4 AV |
1435 | struct iov_iter i = *from; |
1436 | ||
88529176 JW |
1437 | /* There are 256 bytes to be copied in skb, so there is |
1438 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1439 | * The rest of the buffer is mapped from userspace. |
1440 | */ | |
56f0dcc5 | 1441 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1442 | if (copylen > good_linear) |
1443 | copylen = good_linear; | |
3dd5c330 | 1444 | linear = copylen; |
f5ff53b4 AV |
1445 | iov_iter_advance(&i, copylen); |
1446 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1447 | zerocopy = true; |
1448 | } | |
1449 | ||
66ccbc9c | 1450 | if (tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) { |
1cfe6e93 JW |
1451 | /* For the packet that is not easy to be processed |
1452 | * (e.g gso or jumbo packet), we will do it at after | |
1453 | * skb was created with generic XDP routine. | |
1454 | */ | |
1455 | skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp); | |
66ccbc9c | 1456 | if (IS_ERR(skb)) { |
608b9977 | 1457 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
66ccbc9c JW |
1458 | return PTR_ERR(skb); |
1459 | } | |
761876c8 JW |
1460 | if (!skb) |
1461 | return total_len; | |
66ccbc9c JW |
1462 | } else { |
1463 | if (!zerocopy) { | |
1464 | copylen = len; | |
1465 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) | |
1466 | linear = good_linear; | |
1467 | else | |
1468 | linear = tun16_to_cpu(tun, gso.hdr_len); | |
1469 | } | |
1da177e4 | 1470 | |
66ccbc9c JW |
1471 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
1472 | if (IS_ERR(skb)) { | |
1473 | if (PTR_ERR(skb) != -EAGAIN) | |
1474 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1475 | return PTR_ERR(skb); | |
1476 | } | |
0690899b | 1477 | |
66ccbc9c JW |
1478 | if (zerocopy) |
1479 | err = zerocopy_sg_from_iter(skb, from); | |
1480 | else | |
1481 | err = skb_copy_datagram_from_iter(skb, 0, from, len); | |
1482 | ||
1483 | if (err) { | |
1484 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1485 | kfree_skb(skb); | |
1486 | return -EFAULT; | |
1487 | } | |
8f22757e | 1488 | } |
1da177e4 | 1489 | |
3e9e40e7 | 1490 | if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { |
df10db98 PA |
1491 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); |
1492 | kfree_skb(skb); | |
1493 | return -EINVAL; | |
1494 | } | |
1495 | ||
1da177e4 | 1496 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1497 | case IFF_TUN: |
1498 | if (tun->flags & IFF_NO_PI) { | |
2580c4c1 AP |
1499 | u8 ip_version = skb->len ? (skb->data[0] >> 4) : 0; |
1500 | ||
1501 | switch (ip_version) { | |
1502 | case 4: | |
f09f7ee2 AWC |
1503 | pi.proto = htons(ETH_P_IP); |
1504 | break; | |
2580c4c1 | 1505 | case 6: |
f09f7ee2 AWC |
1506 | pi.proto = htons(ETH_P_IPV6); |
1507 | break; | |
1508 | default: | |
608b9977 | 1509 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
f09f7ee2 AWC |
1510 | kfree_skb(skb); |
1511 | return -EINVAL; | |
1512 | } | |
1513 | } | |
1514 | ||
459a98ed | 1515 | skb_reset_mac_header(skb); |
1da177e4 | 1516 | skb->protocol = pi.proto; |
4c13eb66 | 1517 | skb->dev = tun->dev; |
1da177e4 | 1518 | break; |
40630b82 | 1519 | case IFF_TAP: |
1da177e4 LT |
1520 | skb->protocol = eth_type_trans(skb, tun->dev); |
1521 | break; | |
6403eab1 | 1522 | } |
1da177e4 | 1523 | |
0690899b MT |
1524 | /* copy skb_ubuf_info for callback when skb has no error */ |
1525 | if (zerocopy) { | |
1526 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1527 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1528 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
af1cc7a2 JW |
1529 | } else if (msg_control) { |
1530 | struct ubuf_info *uarg = msg_control; | |
1531 | uarg->callback(uarg, false); | |
0690899b MT |
1532 | } |
1533 | ||
72f65107 | 1534 | skb_reset_network_header(skb); |
40893fd0 | 1535 | skb_probe_transport_header(skb, 0); |
38502af7 | 1536 | |
1cfe6e93 | 1537 | if (skb_xdp) { |
761876c8 JW |
1538 | struct bpf_prog *xdp_prog; |
1539 | int ret; | |
1540 | ||
1541 | rcu_read_lock(); | |
1542 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1543 | if (xdp_prog) { | |
1544 | ret = do_xdp_generic(xdp_prog, skb); | |
1545 | if (ret != XDP_PASS) { | |
1546 | rcu_read_unlock(); | |
1547 | return total_len; | |
1548 | } | |
1549 | } | |
1550 | rcu_read_unlock(); | |
1551 | } | |
1552 | ||
feec084a | 1553 | rxhash = __skb_get_hash_symmetric(skb); |
d4aea20d | 1554 | #ifndef CONFIG_4KSTACKS |
5503fcec | 1555 | tun_rx_batched(tun, tfile, skb, more); |
d4aea20d | 1556 | #else |
1da177e4 | 1557 | netif_rx_ni(skb); |
d4aea20d | 1558 | #endif |
6aa20a22 | 1559 | |
608b9977 PA |
1560 | stats = get_cpu_ptr(tun->pcpu_stats); |
1561 | u64_stats_update_begin(&stats->syncp); | |
1562 | stats->rx_packets++; | |
1563 | stats->rx_bytes += len; | |
1564 | u64_stats_update_end(&stats->syncp); | |
1565 | put_cpu_ptr(stats); | |
1da177e4 | 1566 | |
9e85722d | 1567 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1568 | return total_len; |
6aa20a22 | 1569 | } |
1da177e4 | 1570 | |
f5ff53b4 | 1571 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 1572 | { |
33dccbb0 | 1573 | struct file *file = iocb->ki_filp; |
ab46d779 | 1574 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1575 | struct tun_file *tfile = file->private_data; |
631ab46b | 1576 | ssize_t result; |
1da177e4 LT |
1577 | |
1578 | if (!tun) | |
1579 | return -EBADFD; | |
1580 | ||
5503fcec JW |
1581 | result = tun_get_user(tun, tfile, NULL, from, |
1582 | file->f_flags & O_NONBLOCK, false); | |
631ab46b EB |
1583 | |
1584 | tun_put(tun); | |
1585 | return result; | |
1da177e4 LT |
1586 | } |
1587 | ||
1da177e4 | 1588 | /* Put packet to the user space buffer */ |
6f7c156c | 1589 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1590 | struct tun_file *tfile, |
6f7c156c | 1591 | struct sk_buff *skb, |
e0b46d0e | 1592 | struct iov_iter *iter) |
1da177e4 LT |
1593 | { |
1594 | struct tun_pi pi = { 0, skb->protocol }; | |
608b9977 | 1595 | struct tun_pcpu_stats *stats; |
e0b46d0e | 1596 | ssize_t total; |
8c847d25 | 1597 | int vlan_offset = 0; |
a8f9bfdf | 1598 | int vlan_hlen = 0; |
2eb783c4 | 1599 | int vnet_hdr_sz = 0; |
a8f9bfdf | 1600 | |
df8a39de | 1601 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 1602 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 1603 | |
40630b82 | 1604 | if (tun->flags & IFF_VNET_HDR) |
e1edab87 | 1605 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1da177e4 | 1606 | |
e0b46d0e HX |
1607 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
1608 | ||
40630b82 | 1609 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 1610 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
1611 | return -EINVAL; |
1612 | ||
e0b46d0e HX |
1613 | total += sizeof(pi); |
1614 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
1615 | /* Packet will be striped */ |
1616 | pi.flags |= TUN_PKT_STRIP; | |
1617 | } | |
6aa20a22 | 1618 | |
e0b46d0e | 1619 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 1620 | return -EFAULT; |
6aa20a22 | 1621 | } |
1da177e4 | 1622 | |
2eb783c4 | 1623 | if (vnet_hdr_sz) { |
9403cd7c | 1624 | struct virtio_net_hdr gso; |
34166093 | 1625 | |
e0b46d0e | 1626 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
1627 | return -EINVAL; |
1628 | ||
3e9e40e7 | 1629 | if (virtio_net_hdr_from_skb(skb, &gso, |
6391a448 | 1630 | tun_is_little_endian(tun), true)) { |
f43798c2 | 1631 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
34166093 MR |
1632 | pr_err("unexpected GSO type: " |
1633 | "0x%x, gso_size %d, hdr_len %d\n", | |
1634 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), | |
1635 | tun16_to_cpu(tun, gso.hdr_len)); | |
1636 | print_hex_dump(KERN_ERR, "tun: ", | |
1637 | DUMP_PREFIX_NONE, | |
1638 | 16, 1, skb->head, | |
1639 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); | |
1640 | WARN_ON_ONCE(1); | |
1641 | return -EINVAL; | |
1642 | } | |
f43798c2 | 1643 | |
e0b46d0e | 1644 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 1645 | return -EFAULT; |
8c847d25 JW |
1646 | |
1647 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
1648 | } |
1649 | ||
a8f9bfdf | 1650 | if (vlan_hlen) { |
e0b46d0e | 1651 | int ret; |
6680ec68 JW |
1652 | struct { |
1653 | __be16 h_vlan_proto; | |
1654 | __be16 h_vlan_TCI; | |
1655 | } veth; | |
1656 | ||
1657 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 1658 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
1659 | |
1660 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 1661 | |
e0b46d0e HX |
1662 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
1663 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
1664 | goto done; |
1665 | ||
e0b46d0e HX |
1666 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
1667 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
1668 | goto done; |
1669 | } | |
1da177e4 | 1670 | |
e0b46d0e | 1671 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 1672 | |
6680ec68 | 1673 | done: |
608b9977 PA |
1674 | /* caller is in process context, */ |
1675 | stats = get_cpu_ptr(tun->pcpu_stats); | |
1676 | u64_stats_update_begin(&stats->syncp); | |
1677 | stats->tx_packets++; | |
1678 | stats->tx_bytes += skb->len + vlan_hlen; | |
1679 | u64_stats_update_end(&stats->syncp); | |
1680 | put_cpu_ptr(tun->pcpu_stats); | |
1da177e4 LT |
1681 | |
1682 | return total; | |
1683 | } | |
1684 | ||
1576d986 JW |
1685 | static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock, |
1686 | int *err) | |
1687 | { | |
1688 | DECLARE_WAITQUEUE(wait, current); | |
1689 | struct sk_buff *skb = NULL; | |
f48cc6b2 | 1690 | int error = 0; |
1576d986 JW |
1691 | |
1692 | skb = skb_array_consume(&tfile->tx_array); | |
1693 | if (skb) | |
1694 | goto out; | |
1695 | if (noblock) { | |
f48cc6b2 | 1696 | error = -EAGAIN; |
1576d986 JW |
1697 | goto out; |
1698 | } | |
1699 | ||
1700 | add_wait_queue(&tfile->wq.wait, &wait); | |
1701 | current->state = TASK_INTERRUPTIBLE; | |
1702 | ||
1703 | while (1) { | |
1704 | skb = skb_array_consume(&tfile->tx_array); | |
1705 | if (skb) | |
1706 | break; | |
1707 | if (signal_pending(current)) { | |
f48cc6b2 | 1708 | error = -ERESTARTSYS; |
1576d986 JW |
1709 | break; |
1710 | } | |
1711 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { | |
f48cc6b2 | 1712 | error = -EFAULT; |
1576d986 JW |
1713 | break; |
1714 | } | |
1715 | ||
1716 | schedule(); | |
1717 | } | |
1718 | ||
1719 | current->state = TASK_RUNNING; | |
1720 | remove_wait_queue(&tfile->wq.wait, &wait); | |
1721 | ||
1722 | out: | |
f48cc6b2 | 1723 | *err = error; |
1576d986 JW |
1724 | return skb; |
1725 | } | |
1726 | ||
54f968d6 | 1727 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 | 1728 | struct iov_iter *to, |
ac77cfd4 | 1729 | int noblock, struct sk_buff *skb) |
1da177e4 | 1730 | { |
9b067034 | 1731 | ssize_t ret; |
1576d986 | 1732 | int err; |
1da177e4 | 1733 | |
3872baf6 | 1734 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1735 | |
9b067034 AV |
1736 | if (!iov_iter_count(to)) |
1737 | return 0; | |
1da177e4 | 1738 | |
ac77cfd4 JW |
1739 | if (!skb) { |
1740 | /* Read frames from ring */ | |
1741 | skb = tun_ring_recv(tfile, noblock, &err); | |
1742 | if (!skb) | |
1743 | return err; | |
1744 | } | |
e0b46d0e | 1745 | |
9b067034 | 1746 | ret = tun_put_user(tun, tfile, skb, to); |
f51a5e82 | 1747 | if (unlikely(ret < 0)) |
f271b2cc | 1748 | kfree_skb(skb); |
f51a5e82 JW |
1749 | else |
1750 | consume_skb(skb); | |
1da177e4 | 1751 | |
05c2828c MT |
1752 | return ret; |
1753 | } | |
1754 | ||
9b067034 | 1755 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
1756 | { |
1757 | struct file *file = iocb->ki_filp; | |
1758 | struct tun_file *tfile = file->private_data; | |
1759 | struct tun_struct *tun = __tun_get(tfile); | |
9b067034 | 1760 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
1761 | |
1762 | if (!tun) | |
1763 | return -EBADFD; | |
ac77cfd4 | 1764 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL); |
42404c09 | 1765 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1766 | if (ret > 0) |
1767 | iocb->ki_pos = ret; | |
631ab46b | 1768 | tun_put(tun); |
1da177e4 LT |
1769 | return ret; |
1770 | } | |
1771 | ||
96442e42 JW |
1772 | static void tun_free_netdev(struct net_device *dev) |
1773 | { | |
1774 | struct tun_struct *tun = netdev_priv(dev); | |
1775 | ||
4008e97f | 1776 | BUG_ON(!(list_empty(&tun->disabled))); |
608b9977 | 1777 | free_percpu(tun->pcpu_stats); |
96442e42 | 1778 | tun_flow_uninit(tun); |
5dbbaf2d | 1779 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1780 | } |
1781 | ||
1da177e4 LT |
1782 | static void tun_setup(struct net_device *dev) |
1783 | { | |
1784 | struct tun_struct *tun = netdev_priv(dev); | |
1785 | ||
0625c883 EB |
1786 | tun->owner = INVALID_UID; |
1787 | tun->group = INVALID_GID; | |
1da177e4 | 1788 | |
1da177e4 | 1789 | dev->ethtool_ops = &tun_ethtool_ops; |
cf124db5 DM |
1790 | dev->needs_free_netdev = true; |
1791 | dev->priv_destructor = tun_free_netdev; | |
016adb72 JW |
1792 | /* We prefer our own queue length */ |
1793 | dev->tx_queue_len = TUN_READQ_SIZE; | |
1da177e4 LT |
1794 | } |
1795 | ||
f019a7a5 EB |
1796 | /* Trivial set of netlink ops to allow deleting tun or tap |
1797 | * device with netlink. | |
1798 | */ | |
a8b8a889 MS |
1799 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[], |
1800 | struct netlink_ext_ack *extack) | |
f019a7a5 EB |
1801 | { |
1802 | return -EINVAL; | |
1803 | } | |
1804 | ||
1805 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1806 | .kind = DRV_NAME, | |
1807 | .priv_size = sizeof(struct tun_struct), | |
1808 | .setup = tun_setup, | |
1809 | .validate = tun_validate, | |
1810 | }; | |
1811 | ||
33dccbb0 HX |
1812 | static void tun_sock_write_space(struct sock *sk) |
1813 | { | |
54f968d6 | 1814 | struct tun_file *tfile; |
43815482 | 1815 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1816 | |
1817 | if (!sock_writeable(sk)) | |
1818 | return; | |
1819 | ||
9cd3e072 | 1820 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
33dccbb0 HX |
1821 | return; |
1822 | ||
43815482 ED |
1823 | wqueue = sk_sleep(sk); |
1824 | if (wqueue && waitqueue_active(wqueue)) | |
1825 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1826 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1827 | |
54f968d6 JW |
1828 | tfile = container_of(sk, struct tun_file, sk); |
1829 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1830 | } |
1831 | ||
1b784140 | 1832 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 1833 | { |
54f968d6 JW |
1834 | int ret; |
1835 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1836 | struct tun_struct *tun = __tun_get(tfile); | |
1837 | ||
1838 | if (!tun) | |
1839 | return -EBADFD; | |
f5ff53b4 | 1840 | |
c0371da6 | 1841 | ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, |
5503fcec JW |
1842 | m->msg_flags & MSG_DONTWAIT, |
1843 | m->msg_flags & MSG_MORE); | |
54f968d6 JW |
1844 | tun_put(tun); |
1845 | return ret; | |
05c2828c MT |
1846 | } |
1847 | ||
1b784140 | 1848 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
1849 | int flags) |
1850 | { | |
54f968d6 JW |
1851 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1852 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1853 | int ret; |
54f968d6 JW |
1854 | |
1855 | if (!tun) | |
1856 | return -EBADFD; | |
1857 | ||
eda29772 | 1858 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1859 | ret = -EINVAL; |
1860 | goto out; | |
1861 | } | |
eda29772 RC |
1862 | if (flags & MSG_ERRQUEUE) { |
1863 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1864 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1865 | goto out; | |
1866 | } | |
ac77cfd4 JW |
1867 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, |
1868 | m->msg_control); | |
87897931 | 1869 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
1870 | m->msg_flags |= MSG_TRUNC; |
1871 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1872 | } | |
3811ae76 | 1873 | out: |
54f968d6 | 1874 | tun_put(tun); |
05c2828c MT |
1875 | return ret; |
1876 | } | |
1877 | ||
1576d986 JW |
1878 | static int tun_peek_len(struct socket *sock) |
1879 | { | |
1880 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1881 | struct tun_struct *tun; | |
1882 | int ret = 0; | |
1883 | ||
1884 | tun = __tun_get(tfile); | |
1885 | if (!tun) | |
1886 | return 0; | |
1887 | ||
1888 | ret = skb_array_peek_len(&tfile->tx_array); | |
1889 | tun_put(tun); | |
1890 | ||
1891 | return ret; | |
1892 | } | |
1893 | ||
05c2828c MT |
1894 | /* Ops structure to mimic raw sockets with tun */ |
1895 | static const struct proto_ops tun_socket_ops = { | |
1576d986 | 1896 | .peek_len = tun_peek_len, |
05c2828c MT |
1897 | .sendmsg = tun_sendmsg, |
1898 | .recvmsg = tun_recvmsg, | |
1899 | }; | |
1900 | ||
33dccbb0 HX |
1901 | static struct proto tun_proto = { |
1902 | .name = "tun", | |
1903 | .owner = THIS_MODULE, | |
54f968d6 | 1904 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1905 | }; |
f019a7a5 | 1906 | |
980c9e8c DW |
1907 | static int tun_flags(struct tun_struct *tun) |
1908 | { | |
031f5e03 | 1909 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
1910 | } |
1911 | ||
1912 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1913 | char *buf) | |
1914 | { | |
1915 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1916 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1917 | } | |
1918 | ||
1919 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1920 | char *buf) | |
1921 | { | |
1922 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1923 | return uid_valid(tun->owner)? |
1924 | sprintf(buf, "%u\n", | |
1925 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1926 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1927 | } |
1928 | ||
1929 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1930 | char *buf) | |
1931 | { | |
1932 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1933 | return gid_valid(tun->group) ? |
1934 | sprintf(buf, "%u\n", | |
1935 | from_kgid_munged(current_user_ns(), tun->group)): | |
1936 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1937 | } |
1938 | ||
1939 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1940 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1941 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1942 | ||
c4d33e24 TI |
1943 | static struct attribute *tun_dev_attrs[] = { |
1944 | &dev_attr_tun_flags.attr, | |
1945 | &dev_attr_owner.attr, | |
1946 | &dev_attr_group.attr, | |
1947 | NULL | |
1948 | }; | |
1949 | ||
1950 | static const struct attribute_group tun_attr_group = { | |
1951 | .attrs = tun_dev_attrs | |
1952 | }; | |
1953 | ||
d647a591 | 1954 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1955 | { |
1956 | struct tun_struct *tun; | |
54f968d6 | 1957 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1958 | struct net_device *dev; |
1959 | int err; | |
1960 | ||
7c0c3b1a JW |
1961 | if (tfile->detached) |
1962 | return -EINVAL; | |
1963 | ||
74a3e5a7 EB |
1964 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1965 | if (dev) { | |
f85ba780 DW |
1966 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1967 | return -EBUSY; | |
74a3e5a7 EB |
1968 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1969 | tun = netdev_priv(dev); | |
1970 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1971 | tun = netdev_priv(dev); | |
1972 | else | |
1973 | return -EINVAL; | |
1974 | ||
8e6d91ae | 1975 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 1976 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
1977 | return -EINVAL; |
1978 | ||
cde8b15f | 1979 | if (tun_not_capable(tun)) |
2b980dbd | 1980 | return -EPERM; |
5dbbaf2d | 1981 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1982 | if (err < 0) |
1983 | return err; | |
1984 | ||
849c9b6f | 1985 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1986 | if (err < 0) |
1987 | return err; | |
4008e97f | 1988 | |
40630b82 | 1989 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
1990 | (tun->numqueues + tun->numdisabled > 1)) { |
1991 | /* One or more queue has already been attached, no need | |
1992 | * to initialize the device again. | |
1993 | */ | |
1994 | return 0; | |
1995 | } | |
6aa20a22 | 1996 | } |
1da177e4 LT |
1997 | else { |
1998 | char *name; | |
1999 | unsigned long flags = 0; | |
edfb6a14 JW |
2000 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
2001 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 2002 | |
c260b772 | 2003 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 2004 | return -EPERM; |
2b980dbd PM |
2005 | err = security_tun_dev_create(); |
2006 | if (err < 0) | |
2007 | return err; | |
ca6bb5d7 | 2008 | |
1da177e4 LT |
2009 | /* Set dev type */ |
2010 | if (ifr->ifr_flags & IFF_TUN) { | |
2011 | /* TUN device */ | |
40630b82 | 2012 | flags |= IFF_TUN; |
1da177e4 LT |
2013 | name = "tun%d"; |
2014 | } else if (ifr->ifr_flags & IFF_TAP) { | |
2015 | /* TAP device */ | |
40630b82 | 2016 | flags |= IFF_TAP; |
1da177e4 | 2017 | name = "tap%d"; |
6aa20a22 | 2018 | } else |
36989b90 | 2019 | return -EINVAL; |
6aa20a22 | 2020 | |
1da177e4 LT |
2021 | if (*ifr->ifr_name) |
2022 | name = ifr->ifr_name; | |
2023 | ||
c8d68e6b | 2024 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
2025 | NET_NAME_UNKNOWN, tun_setup, queues, |
2026 | queues); | |
edfb6a14 | 2027 | |
1da177e4 LT |
2028 | if (!dev) |
2029 | return -ENOMEM; | |
0ad646c8 | 2030 | err = dev_get_valid_name(net, dev, name); |
5c25f65f | 2031 | if (err < 0) |
0ad646c8 | 2032 | goto err_free_dev; |
1da177e4 | 2033 | |
fc54c658 | 2034 | dev_net_set(dev, net); |
f019a7a5 | 2035 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 2036 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 2037 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 2038 | |
1da177e4 LT |
2039 | tun = netdev_priv(dev); |
2040 | tun->dev = dev; | |
2041 | tun->flags = flags; | |
f271b2cc | 2042 | tun->txflt.count = 0; |
d9d52b51 | 2043 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 2044 | |
eaea34b2 | 2045 | tun->align = NET_SKB_PAD; |
54f968d6 JW |
2046 | tun->filter_attached = false; |
2047 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
5503fcec | 2048 | tun->rx_batched = 0; |
33dccbb0 | 2049 | |
608b9977 PA |
2050 | tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); |
2051 | if (!tun->pcpu_stats) { | |
2052 | err = -ENOMEM; | |
2053 | goto err_free_dev; | |
2054 | } | |
2055 | ||
96442e42 JW |
2056 | spin_lock_init(&tun->lock); |
2057 | ||
5dbbaf2d PM |
2058 | err = security_tun_dev_alloc_security(&tun->security); |
2059 | if (err < 0) | |
608b9977 | 2060 | goto err_free_stat; |
2b980dbd | 2061 | |
1da177e4 | 2062 | tun_net_init(dev); |
944a1376 | 2063 | tun_flow_init(tun); |
96442e42 | 2064 | |
88255375 | 2065 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
2066 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
2067 | NETIF_F_HW_VLAN_STAG_TX; | |
2a2bbf17 | 2068 | dev->features = dev->hw_features | NETIF_F_LLTX; |
6671b224 FLVC |
2069 | dev->vlan_features = dev->features & |
2070 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
2071 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 2072 | |
4008e97f | 2073 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 2074 | err = tun_attach(tun, file, false); |
eb0fb363 | 2075 | if (err < 0) |
662ca437 | 2076 | goto err_free_flow; |
eb0fb363 | 2077 | |
1da177e4 LT |
2078 | err = register_netdevice(tun->dev); |
2079 | if (err < 0) | |
662ca437 | 2080 | goto err_detach; |
1da177e4 LT |
2081 | } |
2082 | ||
af668b3c MT |
2083 | netif_carrier_on(tun->dev); |
2084 | ||
6b8a66ee | 2085 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 2086 | |
031f5e03 MT |
2087 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
2088 | (ifr->ifr_flags & TUN_FEATURES); | |
c8d68e6b | 2089 | |
e35259a9 MK |
2090 | /* Make sure persistent devices do not get stuck in |
2091 | * xoff state. | |
2092 | */ | |
2093 | if (netif_running(tun->dev)) | |
c8d68e6b | 2094 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 2095 | |
1da177e4 LT |
2096 | strcpy(ifr->ifr_name, tun->dev->name); |
2097 | return 0; | |
2098 | ||
662ca437 JW |
2099 | err_detach: |
2100 | tun_detach_all(dev); | |
ff244c6b ED |
2101 | /* register_netdevice() already called tun_free_netdev() */ |
2102 | goto err_free_dev; | |
2103 | ||
662ca437 JW |
2104 | err_free_flow: |
2105 | tun_flow_uninit(tun); | |
2106 | security_tun_dev_free_security(tun->security); | |
608b9977 PA |
2107 | err_free_stat: |
2108 | free_percpu(tun->pcpu_stats); | |
662ca437 | 2109 | err_free_dev: |
1da177e4 | 2110 | free_netdev(dev); |
1da177e4 LT |
2111 | return err; |
2112 | } | |
2113 | ||
9ce99cf6 | 2114 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 2115 | struct ifreq *ifr) |
e3b99556 | 2116 | { |
6b8a66ee | 2117 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
2118 | |
2119 | strcpy(ifr->ifr_name, tun->dev->name); | |
2120 | ||
980c9e8c | 2121 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 2122 | |
e3b99556 MM |
2123 | } |
2124 | ||
5228ddc9 RR |
2125 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
2126 | * privs required. */ | |
88255375 | 2127 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 2128 | { |
c8f44aff | 2129 | netdev_features_t features = 0; |
5228ddc9 RR |
2130 | |
2131 | if (arg & TUN_F_CSUM) { | |
88255375 | 2132 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
2133 | arg &= ~TUN_F_CSUM; |
2134 | ||
2135 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
2136 | if (arg & TUN_F_TSO_ECN) { | |
2137 | features |= NETIF_F_TSO_ECN; | |
2138 | arg &= ~TUN_F_TSO_ECN; | |
2139 | } | |
2140 | if (arg & TUN_F_TSO4) | |
2141 | features |= NETIF_F_TSO; | |
2142 | if (arg & TUN_F_TSO6) | |
2143 | features |= NETIF_F_TSO6; | |
2144 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
2145 | } | |
2146 | } | |
2147 | ||
2148 | /* This gives the user a way to test for new features in future by | |
2149 | * trying to set them. */ | |
2150 | if (arg) | |
2151 | return -EINVAL; | |
2152 | ||
88255375 | 2153 | tun->set_features = features; |
09050957 YI |
2154 | tun->dev->wanted_features &= ~TUN_USER_FEATURES; |
2155 | tun->dev->wanted_features |= features; | |
88255375 | 2156 | netdev_update_features(tun->dev); |
5228ddc9 RR |
2157 | |
2158 | return 0; | |
2159 | } | |
2160 | ||
c8d68e6b JW |
2161 | static void tun_detach_filter(struct tun_struct *tun, int n) |
2162 | { | |
2163 | int i; | |
2164 | struct tun_file *tfile; | |
2165 | ||
2166 | for (i = 0; i < n; i++) { | |
b8deabd3 | 2167 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2168 | lock_sock(tfile->socket.sk); |
2169 | sk_detach_filter(tfile->socket.sk); | |
2170 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2171 | } |
2172 | ||
2173 | tun->filter_attached = false; | |
2174 | } | |
2175 | ||
2176 | static int tun_attach_filter(struct tun_struct *tun) | |
2177 | { | |
2178 | int i, ret = 0; | |
2179 | struct tun_file *tfile; | |
2180 | ||
2181 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2182 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2183 | lock_sock(tfile->socket.sk); |
2184 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
2185 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2186 | if (ret) { |
2187 | tun_detach_filter(tun, i); | |
2188 | return ret; | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | tun->filter_attached = true; | |
2193 | return ret; | |
2194 | } | |
2195 | ||
2196 | static void tun_set_sndbuf(struct tun_struct *tun) | |
2197 | { | |
2198 | struct tun_file *tfile; | |
2199 | int i; | |
2200 | ||
2201 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2202 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
2203 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
2204 | } | |
2205 | } | |
2206 | ||
cde8b15f JW |
2207 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
2208 | { | |
2209 | struct tun_file *tfile = file->private_data; | |
2210 | struct tun_struct *tun; | |
cde8b15f JW |
2211 | int ret = 0; |
2212 | ||
2213 | rtnl_lock(); | |
2214 | ||
2215 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 2216 | tun = tfile->detached; |
5dbbaf2d | 2217 | if (!tun) { |
cde8b15f | 2218 | ret = -EINVAL; |
5dbbaf2d PM |
2219 | goto unlock; |
2220 | } | |
2221 | ret = security_tun_dev_attach_queue(tun->security); | |
2222 | if (ret < 0) | |
2223 | goto unlock; | |
849c9b6f | 2224 | ret = tun_attach(tun, file, false); |
4008e97f | 2225 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 2226 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 2227 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
2228 | ret = -EINVAL; |
2229 | else | |
2230 | __tun_detach(tfile, false); | |
2231 | } else | |
cde8b15f JW |
2232 | ret = -EINVAL; |
2233 | ||
5dbbaf2d | 2234 | unlock: |
cde8b15f JW |
2235 | rtnl_unlock(); |
2236 | return ret; | |
2237 | } | |
2238 | ||
50857e2a AB |
2239 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
2240 | unsigned long arg, int ifreq_len) | |
1da177e4 | 2241 | { |
36b50bab | 2242 | struct tun_file *tfile = file->private_data; |
631ab46b | 2243 | struct tun_struct *tun; |
1da177e4 LT |
2244 | void __user* argp = (void __user*)arg; |
2245 | struct ifreq ifr; | |
0625c883 EB |
2246 | kuid_t owner; |
2247 | kgid_t group; | |
33dccbb0 | 2248 | int sndbuf; |
d9d52b51 | 2249 | int vnet_hdr_sz; |
fb7589a1 | 2250 | unsigned int ifindex; |
1cf8e410 | 2251 | int le; |
f271b2cc | 2252 | int ret; |
1da177e4 | 2253 | |
20861f26 | 2254 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == SOCK_IOC_TYPE) { |
50857e2a | 2255 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 2256 | return -EFAULT; |
8bbb1813 | 2257 | } else { |
a117dacd | 2258 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 2259 | } |
631ab46b EB |
2260 | if (cmd == TUNGETFEATURES) { |
2261 | /* Currently this just means: "what IFF flags are valid?". | |
2262 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
2263 | * TUNSETIFF. |
2264 | */ | |
2265 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 2266 | (unsigned int __user*)argp); |
cde8b15f JW |
2267 | } else if (cmd == TUNSETQUEUE) |
2268 | return tun_set_queue(file, &ifr); | |
631ab46b | 2269 | |
c8d68e6b | 2270 | ret = 0; |
876bfd4d HX |
2271 | rtnl_lock(); |
2272 | ||
36b50bab | 2273 | tun = __tun_get(tfile); |
0f16bc13 GF |
2274 | if (cmd == TUNSETIFF) { |
2275 | ret = -EEXIST; | |
2276 | if (tun) | |
2277 | goto unlock; | |
2278 | ||
1da177e4 LT |
2279 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
2280 | ||
140e807d | 2281 | ret = tun_set_iff(sock_net(&tfile->sk), file, &ifr); |
1da177e4 | 2282 | |
876bfd4d HX |
2283 | if (ret) |
2284 | goto unlock; | |
1da177e4 | 2285 | |
50857e2a | 2286 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
2287 | ret = -EFAULT; |
2288 | goto unlock; | |
1da177e4 | 2289 | } |
fb7589a1 PE |
2290 | if (cmd == TUNSETIFINDEX) { |
2291 | ret = -EPERM; | |
2292 | if (tun) | |
2293 | goto unlock; | |
2294 | ||
2295 | ret = -EFAULT; | |
2296 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
2297 | goto unlock; | |
2298 | ||
2299 | ret = 0; | |
2300 | tfile->ifindex = ifindex; | |
2301 | goto unlock; | |
2302 | } | |
1da177e4 | 2303 | |
876bfd4d | 2304 | ret = -EBADFD; |
1da177e4 | 2305 | if (!tun) |
876bfd4d | 2306 | goto unlock; |
1da177e4 | 2307 | |
1e588338 | 2308 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 2309 | |
631ab46b | 2310 | ret = 0; |
1da177e4 | 2311 | switch (cmd) { |
e3b99556 | 2312 | case TUNGETIFF: |
9ce99cf6 | 2313 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 2314 | |
3d407a80 PE |
2315 | if (tfile->detached) |
2316 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
2317 | if (!tfile->socket.sk->sk_filter) |
2318 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 2319 | |
50857e2a | 2320 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 2321 | ret = -EFAULT; |
e3b99556 MM |
2322 | break; |
2323 | ||
1da177e4 LT |
2324 | case TUNSETNOCSUM: |
2325 | /* Disable/Enable checksum */ | |
1da177e4 | 2326 | |
88255375 MM |
2327 | /* [unimplemented] */ |
2328 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 2329 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
2330 | break; |
2331 | ||
2332 | case TUNSETPERSIST: | |
54f968d6 JW |
2333 | /* Disable/Enable persist mode. Keep an extra reference to the |
2334 | * module to prevent the module being unprobed. | |
2335 | */ | |
40630b82 MT |
2336 | if (arg && !(tun->flags & IFF_PERSIST)) { |
2337 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 2338 | __module_get(THIS_MODULE); |
dd38bd85 | 2339 | } |
40630b82 MT |
2340 | if (!arg && (tun->flags & IFF_PERSIST)) { |
2341 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 JW |
2342 | module_put(THIS_MODULE); |
2343 | } | |
1da177e4 | 2344 | |
6b8a66ee JP |
2345 | tun_debug(KERN_INFO, tun, "persist %s\n", |
2346 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
2347 | break; |
2348 | ||
2349 | case TUNSETOWNER: | |
2350 | /* Set owner of the device */ | |
0625c883 EB |
2351 | owner = make_kuid(current_user_ns(), arg); |
2352 | if (!uid_valid(owner)) { | |
2353 | ret = -EINVAL; | |
2354 | break; | |
2355 | } | |
2356 | tun->owner = owner; | |
1e588338 | 2357 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 2358 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
2359 | break; |
2360 | ||
8c644623 GG |
2361 | case TUNSETGROUP: |
2362 | /* Set group of the device */ | |
0625c883 EB |
2363 | group = make_kgid(current_user_ns(), arg); |
2364 | if (!gid_valid(group)) { | |
2365 | ret = -EINVAL; | |
2366 | break; | |
2367 | } | |
2368 | tun->group = group; | |
1e588338 | 2369 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 2370 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
2371 | break; |
2372 | ||
ff4cc3ac MK |
2373 | case TUNSETLINK: |
2374 | /* Only allow setting the type when the interface is down */ | |
2375 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
2376 | tun_debug(KERN_INFO, tun, |
2377 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 2378 | ret = -EBUSY; |
ff4cc3ac MK |
2379 | } else { |
2380 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
2381 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
2382 | tun->dev->type); | |
48abfe05 | 2383 | ret = 0; |
ff4cc3ac | 2384 | } |
631ab46b | 2385 | break; |
ff4cc3ac | 2386 | |
1da177e4 LT |
2387 | #ifdef TUN_DEBUG |
2388 | case TUNSETDEBUG: | |
2389 | tun->debug = arg; | |
2390 | break; | |
2391 | #endif | |
5228ddc9 | 2392 | case TUNSETOFFLOAD: |
88255375 | 2393 | ret = set_offload(tun, arg); |
631ab46b | 2394 | break; |
5228ddc9 | 2395 | |
f271b2cc MK |
2396 | case TUNSETTXFILTER: |
2397 | /* Can be set only for TAPs */ | |
631ab46b | 2398 | ret = -EINVAL; |
40630b82 | 2399 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 2400 | break; |
c0e5a8c2 | 2401 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2402 | break; |
1da177e4 LT |
2403 | |
2404 | case SIOCGIFHWADDR: | |
b595076a | 2405 | /* Get hw address */ |
f271b2cc MK |
2406 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2407 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2408 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2409 | ret = -EFAULT; |
2410 | break; | |
1da177e4 LT |
2411 | |
2412 | case SIOCSIFHWADDR: | |
f271b2cc | 2413 | /* Set hw address */ |
6b8a66ee JP |
2414 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2415 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2416 | |
40102371 | 2417 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2418 | break; |
33dccbb0 HX |
2419 | |
2420 | case TUNGETSNDBUF: | |
54f968d6 | 2421 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2422 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2423 | ret = -EFAULT; | |
2424 | break; | |
2425 | ||
2426 | case TUNSETSNDBUF: | |
2427 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2428 | ret = -EFAULT; | |
2429 | break; | |
2430 | } | |
2431 | ||
c8d68e6b JW |
2432 | tun->sndbuf = sndbuf; |
2433 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2434 | break; |
2435 | ||
d9d52b51 MT |
2436 | case TUNGETVNETHDRSZ: |
2437 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2438 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2439 | ret = -EFAULT; | |
2440 | break; | |
2441 | ||
2442 | case TUNSETVNETHDRSZ: | |
2443 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2444 | ret = -EFAULT; | |
2445 | break; | |
2446 | } | |
2447 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2448 | ret = -EINVAL; | |
2449 | break; | |
2450 | } | |
2451 | ||
2452 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2453 | break; | |
2454 | ||
1cf8e410 MT |
2455 | case TUNGETVNETLE: |
2456 | le = !!(tun->flags & TUN_VNET_LE); | |
2457 | if (put_user(le, (int __user *)argp)) | |
2458 | ret = -EFAULT; | |
2459 | break; | |
2460 | ||
2461 | case TUNSETVNETLE: | |
2462 | if (get_user(le, (int __user *)argp)) { | |
2463 | ret = -EFAULT; | |
2464 | break; | |
2465 | } | |
2466 | if (le) | |
2467 | tun->flags |= TUN_VNET_LE; | |
2468 | else | |
2469 | tun->flags &= ~TUN_VNET_LE; | |
2470 | break; | |
2471 | ||
8b8e658b GK |
2472 | case TUNGETVNETBE: |
2473 | ret = tun_get_vnet_be(tun, argp); | |
2474 | break; | |
2475 | ||
2476 | case TUNSETVNETBE: | |
2477 | ret = tun_set_vnet_be(tun, argp); | |
2478 | break; | |
2479 | ||
99405162 MT |
2480 | case TUNATTACHFILTER: |
2481 | /* Can be set only for TAPs */ | |
2482 | ret = -EINVAL; | |
40630b82 | 2483 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
2484 | break; |
2485 | ret = -EFAULT; | |
54f968d6 | 2486 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2487 | break; |
2488 | ||
c8d68e6b | 2489 | ret = tun_attach_filter(tun); |
99405162 MT |
2490 | break; |
2491 | ||
2492 | case TUNDETACHFILTER: | |
2493 | /* Can be set only for TAPs */ | |
2494 | ret = -EINVAL; | |
40630b82 | 2495 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 2496 | break; |
c8d68e6b JW |
2497 | ret = 0; |
2498 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2499 | break; |
2500 | ||
76975e9c PE |
2501 | case TUNGETFILTER: |
2502 | ret = -EINVAL; | |
40630b82 | 2503 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
2504 | break; |
2505 | ret = -EFAULT; | |
2506 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2507 | break; | |
2508 | ret = 0; | |
2509 | break; | |
2510 | ||
1da177e4 | 2511 | default: |
631ab46b EB |
2512 | ret = -EINVAL; |
2513 | break; | |
ee289b64 | 2514 | } |
1da177e4 | 2515 | |
876bfd4d HX |
2516 | unlock: |
2517 | rtnl_unlock(); | |
2518 | if (tun) | |
2519 | tun_put(tun); | |
631ab46b | 2520 | return ret; |
1da177e4 LT |
2521 | } |
2522 | ||
50857e2a AB |
2523 | static long tun_chr_ioctl(struct file *file, |
2524 | unsigned int cmd, unsigned long arg) | |
2525 | { | |
2526 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2527 | } | |
2528 | ||
2529 | #ifdef CONFIG_COMPAT | |
2530 | static long tun_chr_compat_ioctl(struct file *file, | |
2531 | unsigned int cmd, unsigned long arg) | |
2532 | { | |
2533 | switch (cmd) { | |
2534 | case TUNSETIFF: | |
2535 | case TUNGETIFF: | |
2536 | case TUNSETTXFILTER: | |
2537 | case TUNGETSNDBUF: | |
2538 | case TUNSETSNDBUF: | |
2539 | case SIOCGIFHWADDR: | |
2540 | case SIOCSIFHWADDR: | |
2541 | arg = (unsigned long)compat_ptr(arg); | |
2542 | break; | |
2543 | default: | |
2544 | arg = (compat_ulong_t)arg; | |
2545 | break; | |
2546 | } | |
2547 | ||
2548 | /* | |
2549 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2550 | * the end of that structure. All fields that are used in this | |
2551 | * driver are compatible though, we don't need to convert the | |
2552 | * contents. | |
2553 | */ | |
2554 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2555 | } | |
2556 | #endif /* CONFIG_COMPAT */ | |
2557 | ||
1da177e4 LT |
2558 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2559 | { | |
54f968d6 | 2560 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2561 | int ret; |
2562 | ||
54f968d6 | 2563 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2564 | goto out; |
6aa20a22 | 2565 | |
1da177e4 | 2566 | if (on) { |
e0b93edd | 2567 | __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
54f968d6 | 2568 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2569 | } else |
54f968d6 | 2570 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2571 | ret = 0; |
2572 | out: | |
9d319522 | 2573 | return ret; |
1da177e4 LT |
2574 | } |
2575 | ||
2576 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2577 | { | |
140e807d | 2578 | struct net *net = current->nsproxy->net_ns; |
631ab46b | 2579 | struct tun_file *tfile; |
deed49fb | 2580 | |
6b8a66ee | 2581 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2582 | |
140e807d | 2583 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
11aa9c28 | 2584 | &tun_proto, 0); |
631ab46b EB |
2585 | if (!tfile) |
2586 | return -ENOMEM; | |
c956674b | 2587 | RCU_INIT_POINTER(tfile->tun, NULL); |
54f968d6 | 2588 | tfile->flags = 0; |
fb7589a1 | 2589 | tfile->ifindex = 0; |
54f968d6 | 2590 | |
54f968d6 | 2591 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 2592 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
2593 | |
2594 | tfile->socket.file = file; | |
2595 | tfile->socket.ops = &tun_socket_ops; | |
2596 | ||
2597 | sock_init_data(&tfile->socket, &tfile->sk); | |
54f968d6 JW |
2598 | |
2599 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2600 | tfile->sk.sk_sndbuf = INT_MAX; | |
2601 | ||
631ab46b | 2602 | file->private_data = tfile; |
4008e97f | 2603 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2604 | |
19a6afb2 JW |
2605 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2606 | ||
1da177e4 LT |
2607 | return 0; |
2608 | } | |
2609 | ||
2610 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2611 | { | |
631ab46b | 2612 | struct tun_file *tfile = file->private_data; |
1da177e4 | 2613 | |
c8d68e6b | 2614 | tun_detach(tfile, true); |
1da177e4 LT |
2615 | |
2616 | return 0; | |
2617 | } | |
2618 | ||
93e14b6d | 2619 | #ifdef CONFIG_PROC_FS |
a3816ab0 | 2620 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f) |
93e14b6d MY |
2621 | { |
2622 | struct tun_struct *tun; | |
2623 | struct ifreq ifr; | |
2624 | ||
2625 | memset(&ifr, 0, sizeof(ifr)); | |
2626 | ||
2627 | rtnl_lock(); | |
2628 | tun = tun_get(f); | |
2629 | if (tun) | |
2630 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
2631 | rtnl_unlock(); | |
2632 | ||
2633 | if (tun) | |
2634 | tun_put(tun); | |
2635 | ||
a3816ab0 | 2636 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
2637 | } |
2638 | #endif | |
2639 | ||
d54b1fdb | 2640 | static const struct file_operations tun_fops = { |
6aa20a22 | 2641 | .owner = THIS_MODULE, |
1da177e4 | 2642 | .llseek = no_llseek, |
9b067034 | 2643 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 2644 | .write_iter = tun_chr_write_iter, |
1da177e4 | 2645 | .poll = tun_chr_poll, |
50857e2a AB |
2646 | .unlocked_ioctl = tun_chr_ioctl, |
2647 | #ifdef CONFIG_COMPAT | |
2648 | .compat_ioctl = tun_chr_compat_ioctl, | |
2649 | #endif | |
1da177e4 LT |
2650 | .open = tun_chr_open, |
2651 | .release = tun_chr_close, | |
93e14b6d MY |
2652 | .fasync = tun_chr_fasync, |
2653 | #ifdef CONFIG_PROC_FS | |
2654 | .show_fdinfo = tun_chr_show_fdinfo, | |
2655 | #endif | |
1da177e4 LT |
2656 | }; |
2657 | ||
2658 | static struct miscdevice tun_miscdev = { | |
2659 | .minor = TUN_MINOR, | |
2660 | .name = "tun", | |
e454cea2 | 2661 | .nodename = "net/tun", |
1da177e4 | 2662 | .fops = &tun_fops, |
1da177e4 LT |
2663 | }; |
2664 | ||
2665 | /* ethtool interface */ | |
2666 | ||
29ccc49d PR |
2667 | static int tun_get_link_ksettings(struct net_device *dev, |
2668 | struct ethtool_link_ksettings *cmd) | |
2669 | { | |
2670 | ethtool_link_ksettings_zero_link_mode(cmd, supported); | |
2671 | ethtool_link_ksettings_zero_link_mode(cmd, advertising); | |
2672 | cmd->base.speed = SPEED_10; | |
2673 | cmd->base.duplex = DUPLEX_FULL; | |
2674 | cmd->base.port = PORT_TP; | |
2675 | cmd->base.phy_address = 0; | |
2676 | cmd->base.autoneg = AUTONEG_DISABLE; | |
1da177e4 LT |
2677 | return 0; |
2678 | } | |
2679 | ||
2680 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2681 | { | |
2682 | struct tun_struct *tun = netdev_priv(dev); | |
2683 | ||
33a5ba14 RJ |
2684 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2685 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2686 | |
2687 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 2688 | case IFF_TUN: |
33a5ba14 | 2689 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 2690 | break; |
40630b82 | 2691 | case IFF_TAP: |
33a5ba14 | 2692 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2693 | break; |
2694 | } | |
2695 | } | |
2696 | ||
2697 | static u32 tun_get_msglevel(struct net_device *dev) | |
2698 | { | |
2699 | #ifdef TUN_DEBUG | |
2700 | struct tun_struct *tun = netdev_priv(dev); | |
2701 | return tun->debug; | |
2702 | #else | |
2703 | return -EOPNOTSUPP; | |
2704 | #endif | |
2705 | } | |
2706 | ||
2707 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2708 | { | |
2709 | #ifdef TUN_DEBUG | |
2710 | struct tun_struct *tun = netdev_priv(dev); | |
2711 | tun->debug = value; | |
2712 | #endif | |
2713 | } | |
2714 | ||
5503fcec JW |
2715 | static int tun_get_coalesce(struct net_device *dev, |
2716 | struct ethtool_coalesce *ec) | |
2717 | { | |
2718 | struct tun_struct *tun = netdev_priv(dev); | |
2719 | ||
2720 | ec->rx_max_coalesced_frames = tun->rx_batched; | |
2721 | ||
2722 | return 0; | |
2723 | } | |
2724 | ||
2725 | static int tun_set_coalesce(struct net_device *dev, | |
2726 | struct ethtool_coalesce *ec) | |
2727 | { | |
2728 | struct tun_struct *tun = netdev_priv(dev); | |
2729 | ||
2730 | if (ec->rx_max_coalesced_frames > NAPI_POLL_WEIGHT) | |
2731 | tun->rx_batched = NAPI_POLL_WEIGHT; | |
2732 | else | |
2733 | tun->rx_batched = ec->rx_max_coalesced_frames; | |
2734 | ||
2735 | return 0; | |
2736 | } | |
2737 | ||
7282d491 | 2738 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2739 | .get_drvinfo = tun_get_drvinfo, |
2740 | .get_msglevel = tun_get_msglevel, | |
2741 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2742 | .get_link = ethtool_op_get_link, |
eda29772 | 2743 | .get_ts_info = ethtool_op_get_ts_info, |
5503fcec JW |
2744 | .get_coalesce = tun_get_coalesce, |
2745 | .set_coalesce = tun_set_coalesce, | |
29ccc49d | 2746 | .get_link_ksettings = tun_get_link_ksettings, |
1da177e4 LT |
2747 | }; |
2748 | ||
1576d986 JW |
2749 | static int tun_queue_resize(struct tun_struct *tun) |
2750 | { | |
2751 | struct net_device *dev = tun->dev; | |
2752 | struct tun_file *tfile; | |
2753 | struct skb_array **arrays; | |
2754 | int n = tun->numqueues + tun->numdisabled; | |
2755 | int ret, i; | |
2756 | ||
12039046 | 2757 | arrays = kmalloc_array(n, sizeof(*arrays), GFP_KERNEL); |
1576d986 JW |
2758 | if (!arrays) |
2759 | return -ENOMEM; | |
2760 | ||
2761 | for (i = 0; i < tun->numqueues; i++) { | |
2762 | tfile = rtnl_dereference(tun->tfiles[i]); | |
2763 | arrays[i] = &tfile->tx_array; | |
2764 | } | |
2765 | list_for_each_entry(tfile, &tun->disabled, next) | |
2766 | arrays[i++] = &tfile->tx_array; | |
2767 | ||
2768 | ret = skb_array_resize_multiple(arrays, n, | |
2769 | dev->tx_queue_len, GFP_KERNEL); | |
2770 | ||
2771 | kfree(arrays); | |
2772 | return ret; | |
2773 | } | |
2774 | ||
2775 | static int tun_device_event(struct notifier_block *unused, | |
2776 | unsigned long event, void *ptr) | |
2777 | { | |
2778 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2779 | struct tun_struct *tun = netdev_priv(dev); | |
2780 | ||
86dfb4ac CG |
2781 | if (dev->rtnl_link_ops != &tun_link_ops) |
2782 | return NOTIFY_DONE; | |
2783 | ||
1576d986 JW |
2784 | switch (event) { |
2785 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
2786 | if (tun_queue_resize(tun)) | |
2787 | return NOTIFY_BAD; | |
2788 | break; | |
2789 | default: | |
2790 | break; | |
2791 | } | |
2792 | ||
2793 | return NOTIFY_DONE; | |
2794 | } | |
2795 | ||
2796 | static struct notifier_block tun_notifier_block __read_mostly = { | |
2797 | .notifier_call = tun_device_event, | |
2798 | }; | |
79d17604 | 2799 | |
1da177e4 LT |
2800 | static int __init tun_init(void) |
2801 | { | |
2802 | int ret = 0; | |
2803 | ||
6b8a66ee | 2804 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1da177e4 | 2805 | |
f019a7a5 | 2806 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2807 | if (ret) { |
6b8a66ee | 2808 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2809 | goto err_linkops; |
79d17604 PE |
2810 | } |
2811 | ||
1da177e4 | 2812 | ret = misc_register(&tun_miscdev); |
79d17604 | 2813 | if (ret) { |
6b8a66ee | 2814 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2815 | goto err_misc; |
2816 | } | |
1576d986 | 2817 | |
5edfbd3c TZ |
2818 | ret = register_netdevice_notifier(&tun_notifier_block); |
2819 | if (ret) { | |
2820 | pr_err("Can't register netdevice notifier\n"); | |
2821 | goto err_notifier; | |
2822 | } | |
2823 | ||
f019a7a5 | 2824 | return 0; |
5edfbd3c TZ |
2825 | |
2826 | err_notifier: | |
2827 | misc_deregister(&tun_miscdev); | |
79d17604 | 2828 | err_misc: |
f019a7a5 EB |
2829 | rtnl_link_unregister(&tun_link_ops); |
2830 | err_linkops: | |
1da177e4 LT |
2831 | return ret; |
2832 | } | |
2833 | ||
2834 | static void tun_cleanup(void) | |
2835 | { | |
6aa20a22 | 2836 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2837 | rtnl_link_unregister(&tun_link_ops); |
1576d986 | 2838 | unregister_netdevice_notifier(&tun_notifier_block); |
1da177e4 LT |
2839 | } |
2840 | ||
05c2828c MT |
2841 | /* Get an underlying socket object from tun file. Returns error unless file is |
2842 | * attached to a device. The returned object works like a packet socket, it | |
2843 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2844 | * holding a reference to the file for as long as the socket is in use. */ | |
2845 | struct socket *tun_get_socket(struct file *file) | |
2846 | { | |
6e914fc7 | 2847 | struct tun_file *tfile; |
05c2828c MT |
2848 | if (file->f_op != &tun_fops) |
2849 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2850 | tfile = file->private_data; |
2851 | if (!tfile) | |
05c2828c | 2852 | return ERR_PTR(-EBADFD); |
54f968d6 | 2853 | return &tfile->socket; |
05c2828c MT |
2854 | } |
2855 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2856 | ||
83339c6b JW |
2857 | struct skb_array *tun_get_skb_array(struct file *file) |
2858 | { | |
2859 | struct tun_file *tfile; | |
2860 | ||
2861 | if (file->f_op != &tun_fops) | |
2862 | return ERR_PTR(-EINVAL); | |
2863 | tfile = file->private_data; | |
2864 | if (!tfile) | |
2865 | return ERR_PTR(-EBADFD); | |
2866 | return &tfile->tx_array; | |
2867 | } | |
2868 | EXPORT_SYMBOL_GPL(tun_get_skb_array); | |
2869 | ||
1da177e4 LT |
2870 | module_init(tun_init); |
2871 | module_exit(tun_cleanup); | |
2872 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2873 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2874 | MODULE_LICENSE("GPL"); | |
2875 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2876 | MODULE_ALIAS("devname:net/tun"); |