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> |
735fc405 | 73 | #include <net/xdp.h> |
93e14b6d | 74 | #include <linux/seq_file.h> |
e0b46d0e | 75 | #include <linux/uio.h> |
1576d986 | 76 | #include <linux/skb_array.h> |
761876c8 JW |
77 | #include <linux/bpf.h> |
78 | #include <linux/bpf_trace.h> | |
90e33d45 | 79 | #include <linux/mutex.h> |
1da177e4 | 80 | |
7c0f6ba6 | 81 | #include <linux/uaccess.h> |
f2780d6d | 82 | #include <linux/proc_fs.h> |
1da177e4 | 83 | |
4e24f2dd CW |
84 | static void tun_default_link_ksettings(struct net_device *dev, |
85 | struct ethtool_link_ksettings *cmd); | |
86 | ||
14daa021 RR |
87 | /* Uncomment to enable debugging */ |
88 | /* #define TUN_DEBUG 1 */ | |
89 | ||
1da177e4 LT |
90 | #ifdef TUN_DEBUG |
91 | static int debug; | |
14daa021 | 92 | |
6b8a66ee JP |
93 | #define tun_debug(level, tun, fmt, args...) \ |
94 | do { \ | |
95 | if (tun->debug) \ | |
96 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
97 | } while (0) | |
98 | #define DBG1(level, fmt, args...) \ | |
99 | do { \ | |
100 | if (debug == 2) \ | |
101 | printk(level fmt, ##args); \ | |
102 | } while (0) | |
14daa021 | 103 | #else |
6b8a66ee JP |
104 | #define tun_debug(level, tun, fmt, args...) \ |
105 | do { \ | |
106 | if (0) \ | |
107 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
108 | } while (0) | |
109 | #define DBG1(level, fmt, args...) \ | |
110 | do { \ | |
111 | if (0) \ | |
112 | printk(level fmt, ##args); \ | |
113 | } while (0) | |
14daa021 RR |
114 | #endif |
115 | ||
7df13219 | 116 | #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
66ccbc9c | 117 | |
031f5e03 MT |
118 | /* TUN device flags */ |
119 | ||
120 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
121 | * overload it to mean fasync when stored there. | |
122 | */ | |
123 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
124 | /* High bits in flags field are unused. */ |
125 | #define TUN_VNET_LE 0x80000000 | |
8b8e658b | 126 | #define TUN_VNET_BE 0x40000000 |
031f5e03 MT |
127 | |
128 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
90e33d45 PP |
129 | IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS) |
130 | ||
0690899b MT |
131 | #define GOODCOPY_LEN 128 |
132 | ||
f271b2cc MK |
133 | #define FLT_EXACT_COUNT 8 |
134 | struct tap_filter { | |
135 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
136 | u32 mask[2]; /* Mask of the hashed addrs */ | |
137 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
138 | }; | |
139 | ||
baf71c5c PG |
140 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
141 | * to max number of VCPUs in guest. */ | |
142 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 143 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 144 | |
96442e42 JW |
145 | #define TUN_FLOW_EXPIRE (3 * HZ) |
146 | ||
608b9977 PA |
147 | struct tun_pcpu_stats { |
148 | u64 rx_packets; | |
149 | u64 rx_bytes; | |
150 | u64 tx_packets; | |
151 | u64 tx_bytes; | |
152 | struct u64_stats_sync syncp; | |
153 | u32 rx_dropped; | |
154 | u32 tx_dropped; | |
155 | u32 rx_frame_errors; | |
156 | }; | |
157 | ||
54f968d6 | 158 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 159 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
160 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
161 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 162 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 163 | * this). |
6e914fc7 JW |
164 | * |
165 | * RCU usage: | |
36fe8c09 | 166 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 167 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 168 | */ |
631ab46b | 169 | struct tun_file { |
54f968d6 JW |
170 | struct sock sk; |
171 | struct socket socket; | |
172 | struct socket_wq wq; | |
6e914fc7 | 173 | struct tun_struct __rcu *tun; |
54f968d6 JW |
174 | struct fasync_struct *fasync; |
175 | /* only used for fasnyc */ | |
176 | unsigned int flags; | |
fb7589a1 PE |
177 | union { |
178 | u16 queue_index; | |
179 | unsigned int ifindex; | |
180 | }; | |
94317099 | 181 | struct napi_struct napi; |
aec72f33 | 182 | bool napi_enabled; |
90e33d45 | 183 | struct mutex napi_mutex; /* Protects access to the above napi */ |
4008e97f JW |
184 | struct list_head next; |
185 | struct tun_struct *detached; | |
5990a305 | 186 | struct ptr_ring tx_ring; |
8bf5c4ee | 187 | struct xdp_rxq_info xdp_rxq; |
631ab46b EB |
188 | }; |
189 | ||
96442e42 JW |
190 | struct tun_flow_entry { |
191 | struct hlist_node hash_link; | |
192 | struct rcu_head rcu; | |
193 | struct tun_struct *tun; | |
194 | ||
195 | u32 rxhash; | |
9bc88939 | 196 | u32 rps_rxhash; |
96442e42 JW |
197 | int queue_index; |
198 | unsigned long updated; | |
199 | }; | |
200 | ||
201 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
f13b5468 | 202 | #define TUN_MASK_FLOW_ENTRIES (TUN_NUM_FLOW_ENTRIES - 1) |
96442e42 | 203 | |
cd5681d7 | 204 | struct tun_prog { |
96f84061 JW |
205 | struct rcu_head rcu; |
206 | struct bpf_prog *prog; | |
207 | }; | |
208 | ||
54f968d6 | 209 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 210 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
211 | * file were attached to a persist device. |
212 | */ | |
14daa021 | 213 | struct tun_struct { |
c8d68e6b JW |
214 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
215 | unsigned int numqueues; | |
f271b2cc | 216 | unsigned int flags; |
0625c883 EB |
217 | kuid_t owner; |
218 | kgid_t group; | |
14daa021 | 219 | |
14daa021 | 220 | struct net_device *dev; |
c8f44aff | 221 | netdev_features_t set_features; |
88255375 | 222 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
d591a1f3 | 223 | NETIF_F_TSO6) |
d9d52b51 | 224 | |
eaea34b2 | 225 | int align; |
d9d52b51 | 226 | int vnet_hdr_sz; |
54f968d6 JW |
227 | int sndbuf; |
228 | struct tap_filter txflt; | |
229 | struct sock_fprog fprog; | |
230 | /* protected by rtnl lock */ | |
231 | bool filter_attached; | |
14daa021 RR |
232 | #ifdef TUN_DEBUG |
233 | int debug; | |
1da177e4 | 234 | #endif |
96442e42 | 235 | spinlock_t lock; |
96442e42 JW |
236 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
237 | struct timer_list flow_gc_timer; | |
238 | unsigned long ageing_time; | |
4008e97f JW |
239 | unsigned int numdisabled; |
240 | struct list_head disabled; | |
5dbbaf2d | 241 | void *security; |
b8732fb7 | 242 | u32 flow_count; |
5503fcec | 243 | u32 rx_batched; |
608b9977 | 244 | struct tun_pcpu_stats __percpu *pcpu_stats; |
761876c8 | 245 | struct bpf_prog __rcu *xdp_prog; |
cd5681d7 | 246 | struct tun_prog __rcu *steering_prog; |
aff3d70a | 247 | struct tun_prog __rcu *filter_prog; |
4e24f2dd | 248 | struct ethtool_link_ksettings link_ksettings; |
14daa021 | 249 | }; |
1da177e4 | 250 | |
aff3d70a JW |
251 | struct veth { |
252 | __be16 h_vlan_proto; | |
253 | __be16 h_vlan_TCI; | |
14daa021 | 254 | }; |
1da177e4 | 255 | |
1ffcbc85 | 256 | bool tun_is_xdp_frame(void *ptr) |
fc72d1d5 JW |
257 | { |
258 | return (unsigned long)ptr & TUN_XDP_FLAG; | |
259 | } | |
1ffcbc85 | 260 | EXPORT_SYMBOL(tun_is_xdp_frame); |
fc72d1d5 JW |
261 | |
262 | void *tun_xdp_to_ptr(void *ptr) | |
263 | { | |
264 | return (void *)((unsigned long)ptr | TUN_XDP_FLAG); | |
265 | } | |
266 | EXPORT_SYMBOL(tun_xdp_to_ptr); | |
267 | ||
268 | void *tun_ptr_to_xdp(void *ptr) | |
269 | { | |
270 | return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG); | |
271 | } | |
272 | EXPORT_SYMBOL(tun_ptr_to_xdp); | |
273 | ||
94317099 PP |
274 | static int tun_napi_receive(struct napi_struct *napi, int budget) |
275 | { | |
276 | struct tun_file *tfile = container_of(napi, struct tun_file, napi); | |
277 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
278 | struct sk_buff_head process_queue; | |
279 | struct sk_buff *skb; | |
280 | int received = 0; | |
281 | ||
282 | __skb_queue_head_init(&process_queue); | |
283 | ||
284 | spin_lock(&queue->lock); | |
285 | skb_queue_splice_tail_init(queue, &process_queue); | |
286 | spin_unlock(&queue->lock); | |
287 | ||
288 | while (received < budget && (skb = __skb_dequeue(&process_queue))) { | |
289 | napi_gro_receive(napi, skb); | |
290 | ++received; | |
291 | } | |
292 | ||
293 | if (!skb_queue_empty(&process_queue)) { | |
294 | spin_lock(&queue->lock); | |
295 | skb_queue_splice(&process_queue, queue); | |
296 | spin_unlock(&queue->lock); | |
297 | } | |
298 | ||
299 | return received; | |
300 | } | |
301 | ||
302 | static int tun_napi_poll(struct napi_struct *napi, int budget) | |
303 | { | |
304 | unsigned int received; | |
305 | ||
306 | received = tun_napi_receive(napi, budget); | |
307 | ||
308 | if (received < budget) | |
309 | napi_complete_done(napi, received); | |
310 | ||
311 | return received; | |
312 | } | |
313 | ||
314 | static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile, | |
315 | bool napi_en) | |
316 | { | |
aec72f33 | 317 | tfile->napi_enabled = napi_en; |
94317099 PP |
318 | if (napi_en) { |
319 | netif_napi_add(tun->dev, &tfile->napi, tun_napi_poll, | |
320 | NAPI_POLL_WEIGHT); | |
321 | napi_enable(&tfile->napi); | |
90e33d45 | 322 | mutex_init(&tfile->napi_mutex); |
94317099 PP |
323 | } |
324 | } | |
325 | ||
326 | static void tun_napi_disable(struct tun_struct *tun, struct tun_file *tfile) | |
327 | { | |
aec72f33 | 328 | if (tfile->napi_enabled) |
94317099 PP |
329 | napi_disable(&tfile->napi); |
330 | } | |
331 | ||
332 | static void tun_napi_del(struct tun_struct *tun, struct tun_file *tfile) | |
333 | { | |
aec72f33 | 334 | if (tfile->napi_enabled) |
94317099 PP |
335 | netif_napi_del(&tfile->napi); |
336 | } | |
337 | ||
90e33d45 PP |
338 | static bool tun_napi_frags_enabled(const struct tun_struct *tun) |
339 | { | |
340 | return READ_ONCE(tun->flags) & IFF_NAPI_FRAGS; | |
341 | } | |
342 | ||
8b8e658b GK |
343 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
344 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
345 | { | |
346 | return tun->flags & TUN_VNET_BE ? false : | |
347 | virtio_legacy_is_little_endian(); | |
348 | } | |
349 | ||
350 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
351 | { | |
352 | int be = !!(tun->flags & TUN_VNET_BE); | |
353 | ||
354 | if (put_user(be, argp)) | |
355 | return -EFAULT; | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
361 | { | |
362 | int be; | |
363 | ||
364 | if (get_user(be, argp)) | |
365 | return -EFAULT; | |
366 | ||
367 | if (be) | |
368 | tun->flags |= TUN_VNET_BE; | |
369 | else | |
370 | tun->flags &= ~TUN_VNET_BE; | |
371 | ||
372 | return 0; | |
373 | } | |
374 | #else | |
375 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
376 | { | |
377 | return virtio_legacy_is_little_endian(); | |
378 | } | |
379 | ||
380 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
381 | { | |
382 | return -EINVAL; | |
383 | } | |
384 | ||
385 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
386 | { | |
387 | return -EINVAL; | |
388 | } | |
389 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
390 | ||
25bd55bb GK |
391 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
392 | { | |
7d824109 | 393 | return tun->flags & TUN_VNET_LE || |
8b8e658b | 394 | tun_legacy_is_little_endian(tun); |
25bd55bb GK |
395 | } |
396 | ||
56f0dcc5 MT |
397 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
398 | { | |
25bd55bb | 399 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
400 | } |
401 | ||
402 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
403 | { | |
25bd55bb | 404 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
405 | } |
406 | ||
96442e42 JW |
407 | static inline u32 tun_hashfn(u32 rxhash) |
408 | { | |
f13b5468 | 409 | return rxhash & TUN_MASK_FLOW_ENTRIES; |
96442e42 JW |
410 | } |
411 | ||
412 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
413 | { | |
414 | struct tun_flow_entry *e; | |
96442e42 | 415 | |
b67bfe0d | 416 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
417 | if (e->rxhash == rxhash) |
418 | return e; | |
419 | } | |
420 | return NULL; | |
421 | } | |
422 | ||
423 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
424 | struct hlist_head *head, | |
425 | u32 rxhash, u16 queue_index) | |
426 | { | |
9fdc6bef ED |
427 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
428 | ||
96442e42 JW |
429 | if (e) { |
430 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
431 | rxhash, queue_index); | |
432 | e->updated = jiffies; | |
433 | e->rxhash = rxhash; | |
9bc88939 | 434 | e->rps_rxhash = 0; |
96442e42 JW |
435 | e->queue_index = queue_index; |
436 | e->tun = tun; | |
437 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 438 | ++tun->flow_count; |
96442e42 JW |
439 | } |
440 | return e; | |
441 | } | |
442 | ||
96442e42 JW |
443 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
444 | { | |
445 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
446 | e->rxhash, e->queue_index); | |
447 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 448 | kfree_rcu(e, rcu); |
b8732fb7 | 449 | --tun->flow_count; |
96442e42 JW |
450 | } |
451 | ||
452 | static void tun_flow_flush(struct tun_struct *tun) | |
453 | { | |
454 | int i; | |
455 | ||
456 | spin_lock_bh(&tun->lock); | |
457 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
458 | struct tun_flow_entry *e; | |
b67bfe0d | 459 | struct hlist_node *n; |
96442e42 | 460 | |
b67bfe0d | 461 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
462 | tun_flow_delete(tun, e); |
463 | } | |
464 | spin_unlock_bh(&tun->lock); | |
465 | } | |
466 | ||
467 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
468 | { | |
469 | int i; | |
470 | ||
471 | spin_lock_bh(&tun->lock); | |
472 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
473 | struct tun_flow_entry *e; | |
b67bfe0d | 474 | struct hlist_node *n; |
96442e42 | 475 | |
b67bfe0d | 476 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
477 | if (e->queue_index == queue_index) |
478 | tun_flow_delete(tun, e); | |
479 | } | |
480 | } | |
481 | spin_unlock_bh(&tun->lock); | |
482 | } | |
483 | ||
e99e88a9 | 484 | static void tun_flow_cleanup(struct timer_list *t) |
96442e42 | 485 | { |
e99e88a9 | 486 | struct tun_struct *tun = from_timer(tun, t, flow_gc_timer); |
96442e42 JW |
487 | unsigned long delay = tun->ageing_time; |
488 | unsigned long next_timer = jiffies + delay; | |
489 | unsigned long count = 0; | |
490 | int i; | |
491 | ||
492 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
493 | ||
7dbfb4ef | 494 | spin_lock(&tun->lock); |
96442e42 JW |
495 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
496 | struct tun_flow_entry *e; | |
b67bfe0d | 497 | struct hlist_node *n; |
96442e42 | 498 | |
b67bfe0d | 499 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 | 500 | unsigned long this_timer; |
81d98fa4 | 501 | |
96442e42 | 502 | this_timer = e->updated + delay; |
81d98fa4 | 503 | if (time_before_eq(this_timer, jiffies)) { |
96442e42 | 504 | tun_flow_delete(tun, e); |
81d98fa4 ED |
505 | continue; |
506 | } | |
507 | count++; | |
508 | if (time_before(this_timer, next_timer)) | |
96442e42 JW |
509 | next_timer = this_timer; |
510 | } | |
511 | } | |
512 | ||
513 | if (count) | |
514 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
7dbfb4ef | 515 | spin_unlock(&tun->lock); |
96442e42 JW |
516 | } |
517 | ||
49974420 | 518 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 519 | struct tun_file *tfile) |
96442e42 JW |
520 | { |
521 | struct hlist_head *head; | |
522 | struct tun_flow_entry *e; | |
523 | unsigned long delay = tun->ageing_time; | |
9e85722d | 524 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
525 | |
526 | if (!rxhash) | |
527 | return; | |
528 | else | |
529 | head = &tun->flows[tun_hashfn(rxhash)]; | |
530 | ||
531 | rcu_read_lock(); | |
532 | ||
96442e42 JW |
533 | e = tun_flow_find(head, rxhash); |
534 | if (likely(e)) { | |
535 | /* TODO: keep queueing to old queue until it's empty? */ | |
536 | e->queue_index = queue_index; | |
537 | e->updated = jiffies; | |
9bc88939 | 538 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
539 | } else { |
540 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
541 | if (!tun_flow_find(head, rxhash) && |
542 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
543 | tun_flow_create(tun, head, rxhash, queue_index); |
544 | ||
545 | if (!timer_pending(&tun->flow_gc_timer)) | |
546 | mod_timer(&tun->flow_gc_timer, | |
547 | round_jiffies_up(jiffies + delay)); | |
548 | spin_unlock_bh(&tun->lock); | |
549 | } | |
550 | ||
96442e42 JW |
551 | rcu_read_unlock(); |
552 | } | |
553 | ||
9bc88939 TH |
554 | /** |
555 | * Save the hash received in the stack receive path and update the | |
556 | * flow_hash table accordingly. | |
557 | */ | |
558 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
559 | { | |
567e4b79 | 560 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 561 | e->rps_rxhash = hash; |
9bc88939 TH |
562 | } |
563 | ||
c8d68e6b | 564 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 565 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
566 | * the rxq based on the txq where the last packet of the flow comes. As |
567 | * the userspace application move between processors, we may get a | |
568 | * different rxq no. here. If we could not get rxhash, then we would | |
569 | * hope the rxq no. may help here. | |
570 | */ | |
96f84061 | 571 | static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
c8d68e6b | 572 | { |
96442e42 | 573 | struct tun_flow_entry *e; |
c8d68e6b JW |
574 | u32 txq = 0; |
575 | u32 numqueues = 0; | |
576 | ||
6aa7de05 | 577 | numqueues = READ_ONCE(tun->numqueues); |
c8d68e6b | 578 | |
feec084a | 579 | txq = __skb_get_hash_symmetric(skb); |
c8d68e6b | 580 | if (txq) { |
96442e42 | 581 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 582 | if (e) { |
9bc88939 | 583 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 584 | txq = e->queue_index; |
9bc88939 | 585 | } else |
96442e42 JW |
586 | /* use multiply and shift instead of expensive divide */ |
587 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
588 | } else if (likely(skb_rx_queue_recorded(skb))) { |
589 | txq = skb_get_rx_queue(skb); | |
590 | while (unlikely(txq >= numqueues)) | |
591 | txq -= numqueues; | |
592 | } | |
593 | ||
c8d68e6b JW |
594 | return txq; |
595 | } | |
596 | ||
96f84061 JW |
597 | static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
598 | { | |
cd5681d7 | 599 | struct tun_prog *prog; |
96f84061 JW |
600 | u16 ret = 0; |
601 | ||
602 | prog = rcu_dereference(tun->steering_prog); | |
603 | if (prog) | |
604 | ret = bpf_prog_run_clear_cb(prog->prog, skb); | |
605 | ||
606 | return ret % tun->numqueues; | |
607 | } | |
608 | ||
609 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, | |
4f49dec9 AD |
610 | struct net_device *sb_dev, |
611 | select_queue_fallback_t fallback) | |
96f84061 JW |
612 | { |
613 | struct tun_struct *tun = netdev_priv(dev); | |
614 | u16 ret; | |
615 | ||
616 | rcu_read_lock(); | |
617 | if (rcu_dereference(tun->steering_prog)) | |
618 | ret = tun_ebpf_select_queue(tun, skb); | |
619 | else | |
620 | ret = tun_automq_select_queue(tun, skb); | |
621 | rcu_read_unlock(); | |
622 | ||
623 | return ret; | |
624 | } | |
625 | ||
cde8b15f JW |
626 | static inline bool tun_not_capable(struct tun_struct *tun) |
627 | { | |
628 | const struct cred *cred = current_cred(); | |
c260b772 | 629 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
630 | |
631 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
632 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 633 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
634 | } |
635 | ||
c8d68e6b JW |
636 | static void tun_set_real_num_queues(struct tun_struct *tun) |
637 | { | |
638 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
639 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
640 | } | |
641 | ||
4008e97f JW |
642 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
643 | { | |
644 | tfile->detached = tun; | |
645 | list_add_tail(&tfile->next, &tun->disabled); | |
646 | ++tun->numdisabled; | |
647 | } | |
648 | ||
d32649d1 | 649 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
650 | { |
651 | struct tun_struct *tun = tfile->detached; | |
652 | ||
653 | tfile->detached = NULL; | |
654 | list_del_init(&tfile->next); | |
655 | --tun->numdisabled; | |
656 | return tun; | |
657 | } | |
658 | ||
3a403076 | 659 | void tun_ptr_free(void *ptr) |
fc72d1d5 JW |
660 | { |
661 | if (!ptr) | |
662 | return; | |
1ffcbc85 JDB |
663 | if (tun_is_xdp_frame(ptr)) { |
664 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 665 | |
03993094 | 666 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
667 | } else { |
668 | __skb_array_destroy_skb(ptr); | |
669 | } | |
670 | } | |
3a403076 | 671 | EXPORT_SYMBOL_GPL(tun_ptr_free); |
fc72d1d5 | 672 | |
4bfb0513 JW |
673 | static void tun_queue_purge(struct tun_file *tfile) |
674 | { | |
fc72d1d5 | 675 | void *ptr; |
1576d986 | 676 | |
fc72d1d5 JW |
677 | while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL) |
678 | tun_ptr_free(ptr); | |
1576d986 | 679 | |
5503fcec | 680 | skb_queue_purge(&tfile->sk.sk_write_queue); |
4bfb0513 JW |
681 | skb_queue_purge(&tfile->sk.sk_error_queue); |
682 | } | |
683 | ||
c8d68e6b JW |
684 | static void __tun_detach(struct tun_file *tfile, bool clean) |
685 | { | |
686 | struct tun_file *ntfile; | |
687 | struct tun_struct *tun; | |
c8d68e6b | 688 | |
b8deabd3 JW |
689 | tun = rtnl_dereference(tfile->tun); |
690 | ||
94317099 PP |
691 | if (tun && clean) { |
692 | tun_napi_disable(tun, tfile); | |
693 | tun_napi_del(tun, tfile); | |
694 | } | |
695 | ||
9e85722d | 696 | if (tun && !tfile->detached) { |
c8d68e6b JW |
697 | u16 index = tfile->queue_index; |
698 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
699 | |
700 | rcu_assign_pointer(tun->tfiles[index], | |
701 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 702 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
703 | ntfile->queue_index = index; |
704 | ||
705 | --tun->numqueues; | |
9e85722d | 706 | if (clean) { |
c956674b | 707 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 708 | sock_put(&tfile->sk); |
9e85722d | 709 | } else |
4008e97f | 710 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
711 | |
712 | synchronize_net(); | |
96442e42 | 713 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 714 | /* Drop read queue */ |
4bfb0513 | 715 | tun_queue_purge(tfile); |
c8d68e6b | 716 | tun_set_real_num_queues(tun); |
dd38bd85 | 717 | } else if (tfile->detached && clean) { |
4008e97f | 718 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
719 | sock_put(&tfile->sk); |
720 | } | |
c8d68e6b JW |
721 | |
722 | if (clean) { | |
af668b3c MT |
723 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
724 | netif_carrier_off(tun->dev); | |
725 | ||
40630b82 | 726 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 727 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 728 | unregister_netdevice(tun->dev); |
af668b3c | 729 | } |
b196d88a JW |
730 | if (tun) |
731 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
7063efd3 | 732 | ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free); |
140e807d | 733 | sock_put(&tfile->sk); |
c8d68e6b JW |
734 | } |
735 | } | |
736 | ||
737 | static void tun_detach(struct tun_file *tfile, bool clean) | |
738 | { | |
83c1f36f SD |
739 | struct tun_struct *tun; |
740 | struct net_device *dev; | |
741 | ||
c8d68e6b | 742 | rtnl_lock(); |
83c1f36f SD |
743 | tun = rtnl_dereference(tfile->tun); |
744 | dev = tun ? tun->dev : NULL; | |
c8d68e6b | 745 | __tun_detach(tfile, clean); |
83c1f36f SD |
746 | if (dev) |
747 | netdev_state_change(dev); | |
c8d68e6b JW |
748 | rtnl_unlock(); |
749 | } | |
750 | ||
751 | static void tun_detach_all(struct net_device *dev) | |
752 | { | |
753 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 754 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
755 | int i, n = tun->numqueues; |
756 | ||
757 | for (i = 0; i < n; i++) { | |
b8deabd3 | 758 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 759 | BUG_ON(!tfile); |
94317099 | 760 | tun_napi_disable(tun, tfile); |
addf8fc4 | 761 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 762 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 763 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
764 | --tun->numqueues; |
765 | } | |
9e85722d | 766 | list_for_each_entry(tfile, &tun->disabled, next) { |
addf8fc4 | 767 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 768 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 769 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 770 | } |
c8d68e6b JW |
771 | BUG_ON(tun->numqueues != 0); |
772 | ||
773 | synchronize_net(); | |
774 | for (i = 0; i < n; i++) { | |
b8deabd3 | 775 | tfile = rtnl_dereference(tun->tfiles[i]); |
94317099 | 776 | tun_napi_del(tun, tfile); |
c8d68e6b | 777 | /* Drop read queue */ |
4bfb0513 | 778 | tun_queue_purge(tfile); |
b196d88a | 779 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
c8d68e6b JW |
780 | sock_put(&tfile->sk); |
781 | } | |
4008e97f JW |
782 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
783 | tun_enable_queue(tfile); | |
4bfb0513 | 784 | tun_queue_purge(tfile); |
b196d88a | 785 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
4008e97f JW |
786 | sock_put(&tfile->sk); |
787 | } | |
788 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 789 | |
40630b82 | 790 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 791 | module_put(THIS_MODULE); |
c8d68e6b JW |
792 | } |
793 | ||
94317099 PP |
794 | static int tun_attach(struct tun_struct *tun, struct file *file, |
795 | bool skip_filter, bool napi) | |
a7385ba2 | 796 | { |
631ab46b | 797 | struct tun_file *tfile = file->private_data; |
1576d986 | 798 | struct net_device *dev = tun->dev; |
38231b7a | 799 | int err; |
a7385ba2 | 800 | |
5dbbaf2d PM |
801 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
802 | if (err < 0) | |
803 | goto out; | |
804 | ||
38231b7a | 805 | err = -EINVAL; |
9e85722d | 806 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
807 | goto out; |
808 | ||
809 | err = -EBUSY; | |
40630b82 | 810 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
811 | goto out; |
812 | ||
813 | err = -E2BIG; | |
4008e97f JW |
814 | if (!tfile->detached && |
815 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
816 | goto out; |
817 | ||
818 | err = 0; | |
54f968d6 | 819 | |
92d4ea6e | 820 | /* Re-attach the filter to persist device */ |
849c9b6f | 821 | if (!skip_filter && (tun->filter_attached == true)) { |
8ced425e HFS |
822 | lock_sock(tfile->socket.sk); |
823 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
824 | release_sock(tfile->socket.sk); | |
54f968d6 JW |
825 | if (!err) |
826 | goto out; | |
827 | } | |
1576d986 JW |
828 | |
829 | if (!tfile->detached && | |
b196d88a JW |
830 | ptr_ring_resize(&tfile->tx_ring, dev->tx_queue_len, |
831 | GFP_KERNEL, tun_ptr_free)) { | |
1576d986 JW |
832 | err = -ENOMEM; |
833 | goto out; | |
834 | } | |
835 | ||
c8d68e6b | 836 | tfile->queue_index = tun->numqueues; |
addf8fc4 | 837 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
8bf5c4ee JDB |
838 | |
839 | if (tfile->detached) { | |
840 | /* Re-attach detached tfile, updating XDP queue_index */ | |
841 | WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq)); | |
842 | ||
843 | if (tfile->xdp_rxq.queue_index != tfile->queue_index) | |
844 | tfile->xdp_rxq.queue_index = tfile->queue_index; | |
845 | } else { | |
846 | /* Setup XDP RX-queue info, for new tfile getting attached */ | |
847 | err = xdp_rxq_info_reg(&tfile->xdp_rxq, | |
848 | tun->dev, tfile->queue_index); | |
849 | if (err < 0) | |
850 | goto out; | |
8d5d8852 JDB |
851 | err = xdp_rxq_info_reg_mem_model(&tfile->xdp_rxq, |
852 | MEM_TYPE_PAGE_SHARED, NULL); | |
853 | if (err < 0) { | |
854 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
855 | goto out; | |
856 | } | |
8bf5c4ee JDB |
857 | err = 0; |
858 | } | |
859 | ||
6e914fc7 | 860 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 861 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 862 | tun->numqueues++; |
a7385ba2 | 863 | |
94317099 | 864 | if (tfile->detached) { |
4008e97f | 865 | tun_enable_queue(tfile); |
94317099 | 866 | } else { |
4008e97f | 867 | sock_hold(&tfile->sk); |
94317099 PP |
868 | tun_napi_init(tun, tfile, napi); |
869 | } | |
4008e97f | 870 | |
e4a2a304 JW |
871 | if (rtnl_dereference(tun->xdp_prog)) |
872 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
873 | ||
c8d68e6b | 874 | tun_set_real_num_queues(tun); |
a7385ba2 | 875 | |
c8d68e6b JW |
876 | /* device is allowed to go away first, so no need to hold extra |
877 | * refcnt. | |
878 | */ | |
879 | ||
880 | out: | |
881 | return err; | |
631ab46b EB |
882 | } |
883 | ||
9484dc74 | 884 | static struct tun_struct *tun_get(struct tun_file *tfile) |
631ab46b | 885 | { |
6e914fc7 | 886 | struct tun_struct *tun; |
c70f1829 | 887 | |
6e914fc7 JW |
888 | rcu_read_lock(); |
889 | tun = rcu_dereference(tfile->tun); | |
890 | if (tun) | |
891 | dev_hold(tun->dev); | |
892 | rcu_read_unlock(); | |
c70f1829 EB |
893 | |
894 | return tun; | |
631ab46b EB |
895 | } |
896 | ||
631ab46b EB |
897 | static void tun_put(struct tun_struct *tun) |
898 | { | |
6e914fc7 | 899 | dev_put(tun->dev); |
631ab46b EB |
900 | } |
901 | ||
6b8a66ee | 902 | /* TAP filtering */ |
f271b2cc MK |
903 | static void addr_hash_set(u32 *mask, const u8 *addr) |
904 | { | |
905 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
906 | mask[n >> 5] |= (1 << (n & 31)); | |
907 | } | |
908 | ||
909 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
910 | { | |
911 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
912 | return mask[n >> 5] & (1 << (n & 31)); | |
913 | } | |
914 | ||
915 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
916 | { | |
917 | struct { u8 u[ETH_ALEN]; } *addr; | |
918 | struct tun_filter uf; | |
919 | int err, alen, n, nexact; | |
920 | ||
921 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
922 | return -EFAULT; | |
923 | ||
924 | if (!uf.count) { | |
925 | /* Disabled */ | |
926 | filter->count = 0; | |
927 | return 0; | |
928 | } | |
929 | ||
930 | alen = ETH_ALEN * uf.count; | |
28e8190d ME |
931 | addr = memdup_user(arg + sizeof(uf), alen); |
932 | if (IS_ERR(addr)) | |
933 | return PTR_ERR(addr); | |
f271b2cc MK |
934 | |
935 | /* The filter is updated without holding any locks. Which is | |
936 | * perfectly safe. We disable it first and in the worst | |
937 | * case we'll accept a few undesired packets. */ | |
938 | filter->count = 0; | |
939 | wmb(); | |
940 | ||
941 | /* Use first set of addresses as an exact filter */ | |
942 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
943 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
944 | ||
945 | nexact = n; | |
946 | ||
cfbf84fc AW |
947 | /* Remaining multicast addresses are hashed, |
948 | * unicast will leave the filter disabled. */ | |
f271b2cc | 949 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
950 | for (; n < uf.count; n++) { |
951 | if (!is_multicast_ether_addr(addr[n].u)) { | |
952 | err = 0; /* no filter */ | |
3b8d2a69 | 953 | goto free_addr; |
cfbf84fc | 954 | } |
f271b2cc | 955 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 956 | } |
f271b2cc MK |
957 | |
958 | /* For ALLMULTI just set the mask to all ones. | |
959 | * This overrides the mask populated above. */ | |
960 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
961 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
962 | ||
963 | /* Now enable the filter */ | |
964 | wmb(); | |
965 | filter->count = nexact; | |
966 | ||
967 | /* Return the number of exact filters */ | |
968 | err = nexact; | |
3b8d2a69 | 969 | free_addr: |
f271b2cc MK |
970 | kfree(addr); |
971 | return err; | |
972 | } | |
973 | ||
974 | /* Returns: 0 - drop, !=0 - accept */ | |
975 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
976 | { | |
977 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
978 | * at this point. */ | |
979 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
980 | int i; | |
981 | ||
982 | /* Exact match */ | |
983 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 984 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
985 | return 1; |
986 | ||
987 | /* Inexact match (multicast only) */ | |
988 | if (is_multicast_ether_addr(eh->h_dest)) | |
989 | return addr_hash_test(filter->mask, eh->h_dest); | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | /* | |
995 | * Checks whether the packet is accepted or not. | |
996 | * Returns: 0 - drop, !=0 - accept | |
997 | */ | |
998 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
999 | { | |
1000 | if (!filter->count) | |
1001 | return 1; | |
1002 | ||
1003 | return run_filter(filter, skb); | |
1004 | } | |
1005 | ||
1da177e4 LT |
1006 | /* Network device part of the driver */ |
1007 | ||
7282d491 | 1008 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 1009 | |
c70f1829 EB |
1010 | /* Net device detach from fd. */ |
1011 | static void tun_net_uninit(struct net_device *dev) | |
1012 | { | |
c8d68e6b | 1013 | tun_detach_all(dev); |
c70f1829 EB |
1014 | } |
1015 | ||
1da177e4 LT |
1016 | /* Net device open. */ |
1017 | static int tun_net_open(struct net_device *dev) | |
1018 | { | |
b20e2d54 HFS |
1019 | struct tun_struct *tun = netdev_priv(dev); |
1020 | int i; | |
1021 | ||
c8d68e6b | 1022 | netif_tx_start_all_queues(dev); |
b20e2d54 HFS |
1023 | |
1024 | for (i = 0; i < tun->numqueues; i++) { | |
1025 | struct tun_file *tfile; | |
1026 | ||
1027 | tfile = rtnl_dereference(tun->tfiles[i]); | |
1028 | tfile->socket.sk->sk_write_space(tfile->socket.sk); | |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | return 0; |
1032 | } | |
1033 | ||
1034 | /* Net device close. */ | |
1035 | static int tun_net_close(struct net_device *dev) | |
1036 | { | |
c8d68e6b | 1037 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
1038 | return 0; |
1039 | } | |
1040 | ||
1041 | /* Net device start xmit */ | |
96f84061 | 1042 | static void tun_automq_xmit(struct tun_struct *tun, struct sk_buff *skb) |
1da177e4 | 1043 | { |
3df97ba8 | 1044 | #ifdef CONFIG_RPS |
96f84061 | 1045 | if (tun->numqueues == 1 && static_key_false(&rps_needed)) { |
9bc88939 TH |
1046 | /* Select queue was not called for the skbuff, so we extract the |
1047 | * RPS hash and save it into the flow_table here. | |
1048 | */ | |
1049 | __u32 rxhash; | |
1050 | ||
feec084a | 1051 | rxhash = __skb_get_hash_symmetric(skb); |
9bc88939 TH |
1052 | if (rxhash) { |
1053 | struct tun_flow_entry *e; | |
1054 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
1055 | rxhash); | |
1056 | if (e) | |
1057 | tun_flow_save_rps_rxhash(e, rxhash); | |
1058 | } | |
1059 | } | |
3df97ba8 | 1060 | #endif |
96f84061 JW |
1061 | } |
1062 | ||
aff3d70a JW |
1063 | static unsigned int run_ebpf_filter(struct tun_struct *tun, |
1064 | struct sk_buff *skb, | |
1065 | int len) | |
1066 | { | |
1067 | struct tun_prog *prog = rcu_dereference(tun->filter_prog); | |
1068 | ||
1069 | if (prog) | |
1070 | len = bpf_prog_run_clear_cb(prog->prog, skb); | |
1071 | ||
1072 | return len; | |
1073 | } | |
1074 | ||
96f84061 JW |
1075 | /* Net device start xmit */ |
1076 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
1077 | { | |
1078 | struct tun_struct *tun = netdev_priv(dev); | |
1079 | int txq = skb->queue_mapping; | |
1080 | struct tun_file *tfile; | |
aff3d70a | 1081 | int len = skb->len; |
96f84061 JW |
1082 | |
1083 | rcu_read_lock(); | |
1084 | tfile = rcu_dereference(tun->tfiles[txq]); | |
96f84061 JW |
1085 | |
1086 | /* Drop packet if interface is not attached */ | |
cc166427 | 1087 | if (txq >= tun->numqueues) |
96f84061 JW |
1088 | goto drop; |
1089 | ||
1090 | if (!rcu_dereference(tun->steering_prog)) | |
1091 | tun_automq_xmit(tun, skb); | |
9bc88939 | 1092 | |
6e914fc7 JW |
1093 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
1094 | ||
c8d68e6b JW |
1095 | BUG_ON(!tfile); |
1096 | ||
f271b2cc MK |
1097 | /* Drop if the filter does not like it. |
1098 | * This is a noop if the filter is disabled. | |
1099 | * Filter can be enabled only for the TAP devices. */ | |
1100 | if (!check_filter(&tun->txflt, skb)) | |
1101 | goto drop; | |
1102 | ||
54f968d6 JW |
1103 | if (tfile->socket.sk->sk_filter && |
1104 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
1105 | goto drop; |
1106 | ||
aff3d70a | 1107 | len = run_ebpf_filter(tun, skb, len); |
81c89507 | 1108 | if (len == 0 || pskb_trim(skb, len)) |
aff3d70a JW |
1109 | goto drop; |
1110 | ||
1f8b977a | 1111 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
7bf66305 JW |
1112 | goto drop; |
1113 | ||
7b996243 | 1114 | skb_tx_timestamp(skb); |
eda29772 | 1115 | |
0110d6f2 | 1116 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
1117 | * for indefinite time. |
1118 | */ | |
0110d6f2 MT |
1119 | skb_orphan(skb); |
1120 | ||
f8af75f3 ED |
1121 | nf_reset(skb); |
1122 | ||
5990a305 | 1123 | if (ptr_ring_produce(&tfile->tx_ring, skb)) |
1576d986 | 1124 | goto drop; |
1da177e4 LT |
1125 | |
1126 | /* Notify and wake up reader process */ | |
54f968d6 JW |
1127 | if (tfile->flags & TUN_FASYNC) |
1128 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 1129 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
1130 | |
1131 | rcu_read_unlock(); | |
6ed10654 | 1132 | return NETDEV_TX_OK; |
1da177e4 LT |
1133 | |
1134 | drop: | |
608b9977 | 1135 | this_cpu_inc(tun->pcpu_stats->tx_dropped); |
149d36f7 | 1136 | skb_tx_error(skb); |
1da177e4 | 1137 | kfree_skb(skb); |
6e914fc7 | 1138 | rcu_read_unlock(); |
baeababb | 1139 | return NET_XMIT_DROP; |
1da177e4 LT |
1140 | } |
1141 | ||
f271b2cc | 1142 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 1143 | { |
f271b2cc MK |
1144 | /* |
1145 | * This callback is supposed to deal with mc filter in | |
1146 | * _rx_ path and has nothing to do with the _tx_ path. | |
1147 | * In rx path we always accept everything userspace gives us. | |
1148 | */ | |
1da177e4 LT |
1149 | } |
1150 | ||
c8f44aff MM |
1151 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
1152 | netdev_features_t features) | |
88255375 MM |
1153 | { |
1154 | struct tun_struct *tun = netdev_priv(dev); | |
1155 | ||
1156 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
1157 | } | |
bebd097a NH |
1158 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1159 | static void tun_poll_controller(struct net_device *dev) | |
1160 | { | |
1161 | /* | |
1162 | * Tun only receives frames when: | |
1163 | * 1) the char device endpoint gets data from user space | |
1164 | * 2) the tun socket gets a sendmsg call from user space | |
94317099 PP |
1165 | * If NAPI is not enabled, since both of those are synchronous |
1166 | * operations, we are guaranteed never to have pending data when we poll | |
1167 | * for it so there is nothing to do here but return. | |
bebd097a NH |
1168 | * We need this though so netpoll recognizes us as an interface that |
1169 | * supports polling, which enables bridge devices in virt setups to | |
1170 | * still use netconsole | |
94317099 | 1171 | * If NAPI is enabled, however, we need to schedule polling for all |
90e33d45 PP |
1172 | * queues unless we are using napi_gro_frags(), which we call in |
1173 | * process context and not in NAPI context. | |
bebd097a | 1174 | */ |
94317099 PP |
1175 | struct tun_struct *tun = netdev_priv(dev); |
1176 | ||
1177 | if (tun->flags & IFF_NAPI) { | |
1178 | struct tun_file *tfile; | |
1179 | int i; | |
1180 | ||
90e33d45 PP |
1181 | if (tun_napi_frags_enabled(tun)) |
1182 | return; | |
1183 | ||
94317099 PP |
1184 | rcu_read_lock(); |
1185 | for (i = 0; i < tun->numqueues; i++) { | |
1186 | tfile = rcu_dereference(tun->tfiles[i]); | |
aec72f33 ED |
1187 | if (tfile->napi_enabled) |
1188 | napi_schedule(&tfile->napi); | |
94317099 PP |
1189 | } |
1190 | rcu_read_unlock(); | |
1191 | } | |
bebd097a NH |
1192 | return; |
1193 | } | |
1194 | #endif | |
eaea34b2 PA |
1195 | |
1196 | static void tun_set_headroom(struct net_device *dev, int new_hr) | |
1197 | { | |
1198 | struct tun_struct *tun = netdev_priv(dev); | |
1199 | ||
1200 | if (new_hr < NET_SKB_PAD) | |
1201 | new_hr = NET_SKB_PAD; | |
1202 | ||
1203 | tun->align = new_hr; | |
1204 | } | |
1205 | ||
bc1f4470 | 1206 | static void |
608b9977 PA |
1207 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
1208 | { | |
1209 | u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; | |
1210 | struct tun_struct *tun = netdev_priv(dev); | |
1211 | struct tun_pcpu_stats *p; | |
1212 | int i; | |
1213 | ||
1214 | for_each_possible_cpu(i) { | |
1215 | u64 rxpackets, rxbytes, txpackets, txbytes; | |
1216 | unsigned int start; | |
1217 | ||
1218 | p = per_cpu_ptr(tun->pcpu_stats, i); | |
1219 | do { | |
1220 | start = u64_stats_fetch_begin(&p->syncp); | |
1221 | rxpackets = p->rx_packets; | |
1222 | rxbytes = p->rx_bytes; | |
1223 | txpackets = p->tx_packets; | |
1224 | txbytes = p->tx_bytes; | |
1225 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
1226 | ||
1227 | stats->rx_packets += rxpackets; | |
1228 | stats->rx_bytes += rxbytes; | |
1229 | stats->tx_packets += txpackets; | |
1230 | stats->tx_bytes += txbytes; | |
1231 | ||
1232 | /* u32 counters */ | |
1233 | rx_dropped += p->rx_dropped; | |
1234 | rx_frame_errors += p->rx_frame_errors; | |
1235 | tx_dropped += p->tx_dropped; | |
1236 | } | |
1237 | stats->rx_dropped = rx_dropped; | |
1238 | stats->rx_frame_errors = rx_frame_errors; | |
1239 | stats->tx_dropped = tx_dropped; | |
608b9977 PA |
1240 | } |
1241 | ||
761876c8 JW |
1242 | static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1243 | struct netlink_ext_ack *extack) | |
1244 | { | |
1245 | struct tun_struct *tun = netdev_priv(dev); | |
e4a2a304 | 1246 | struct tun_file *tfile; |
761876c8 | 1247 | struct bpf_prog *old_prog; |
e4a2a304 | 1248 | int i; |
761876c8 JW |
1249 | |
1250 | old_prog = rtnl_dereference(tun->xdp_prog); | |
1251 | rcu_assign_pointer(tun->xdp_prog, prog); | |
1252 | if (old_prog) | |
1253 | bpf_prog_put(old_prog); | |
1254 | ||
e4a2a304 JW |
1255 | for (i = 0; i < tun->numqueues; i++) { |
1256 | tfile = rtnl_dereference(tun->tfiles[i]); | |
1257 | if (prog) | |
1258 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1259 | else | |
1260 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1261 | } | |
1262 | list_for_each_entry(tfile, &tun->disabled, next) { | |
1263 | if (prog) | |
1264 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1265 | else | |
1266 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1267 | } | |
1268 | ||
761876c8 JW |
1269 | return 0; |
1270 | } | |
1271 | ||
1272 | static u32 tun_xdp_query(struct net_device *dev) | |
1273 | { | |
1274 | struct tun_struct *tun = netdev_priv(dev); | |
1275 | const struct bpf_prog *xdp_prog; | |
1276 | ||
1277 | xdp_prog = rtnl_dereference(tun->xdp_prog); | |
1278 | if (xdp_prog) | |
1279 | return xdp_prog->aux->id; | |
1280 | ||
1281 | return 0; | |
1282 | } | |
1283 | ||
f4e63525 | 1284 | static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
761876c8 JW |
1285 | { |
1286 | switch (xdp->command) { | |
1287 | case XDP_SETUP_PROG: | |
1288 | return tun_xdp_set(dev, xdp->prog, xdp->extack); | |
1289 | case XDP_QUERY_PROG: | |
1290 | xdp->prog_id = tun_xdp_query(dev); | |
761876c8 JW |
1291 | return 0; |
1292 | default: | |
1293 | return -EINVAL; | |
1294 | } | |
1295 | } | |
1296 | ||
758e43b7 | 1297 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 1298 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1299 | .ndo_open = tun_net_open, |
1300 | .ndo_stop = tun_net_close, | |
00829823 | 1301 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1302 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 1303 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1304 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1305 | .ndo_poll_controller = tun_poll_controller, | |
1306 | #endif | |
eaea34b2 | 1307 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1308 | .ndo_get_stats64 = tun_net_get_stats64, |
758e43b7 SH |
1309 | }; |
1310 | ||
0c9d917b JDB |
1311 | static void __tun_xdp_flush_tfile(struct tun_file *tfile) |
1312 | { | |
1313 | /* Notify and wake up reader process */ | |
1314 | if (tfile->flags & TUN_FASYNC) | |
1315 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
1316 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); | |
1317 | } | |
1318 | ||
42b33468 JDB |
1319 | static int tun_xdp_xmit(struct net_device *dev, int n, |
1320 | struct xdp_frame **frames, u32 flags) | |
fc72d1d5 JW |
1321 | { |
1322 | struct tun_struct *tun = netdev_priv(dev); | |
fc72d1d5 JW |
1323 | struct tun_file *tfile; |
1324 | u32 numqueues; | |
735fc405 JDB |
1325 | int drops = 0; |
1326 | int cnt = n; | |
1327 | int i; | |
fc72d1d5 | 1328 | |
0c9d917b | 1329 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
42b33468 JDB |
1330 | return -EINVAL; |
1331 | ||
fc72d1d5 JW |
1332 | rcu_read_lock(); |
1333 | ||
1334 | numqueues = READ_ONCE(tun->numqueues); | |
1335 | if (!numqueues) { | |
735fc405 JDB |
1336 | rcu_read_unlock(); |
1337 | return -ENXIO; /* Caller will free/return all frames */ | |
fc72d1d5 JW |
1338 | } |
1339 | ||
1340 | tfile = rcu_dereference(tun->tfiles[smp_processor_id() % | |
1341 | numqueues]); | |
735fc405 JDB |
1342 | |
1343 | spin_lock(&tfile->tx_ring.producer_lock); | |
1344 | for (i = 0; i < n; i++) { | |
1345 | struct xdp_frame *xdp = frames[i]; | |
1346 | /* Encode the XDP flag into lowest bit for consumer to differ | |
1347 | * XDP buffer from sk_buff. | |
1348 | */ | |
1349 | void *frame = tun_xdp_to_ptr(xdp); | |
1350 | ||
1351 | if (__ptr_ring_produce(&tfile->tx_ring, frame)) { | |
1352 | this_cpu_inc(tun->pcpu_stats->tx_dropped); | |
1353 | xdp_return_frame_rx_napi(xdp); | |
1354 | drops++; | |
1355 | } | |
fc72d1d5 | 1356 | } |
735fc405 | 1357 | spin_unlock(&tfile->tx_ring.producer_lock); |
fc72d1d5 | 1358 | |
0c9d917b JDB |
1359 | if (flags & XDP_XMIT_FLUSH) |
1360 | __tun_xdp_flush_tfile(tfile); | |
1361 | ||
fc72d1d5 | 1362 | rcu_read_unlock(); |
735fc405 | 1363 | return cnt - drops; |
fc72d1d5 JW |
1364 | } |
1365 | ||
44fa2dbd JDB |
1366 | static int tun_xdp_tx(struct net_device *dev, struct xdp_buff *xdp) |
1367 | { | |
1368 | struct xdp_frame *frame = convert_to_xdp_frame(xdp); | |
1369 | ||
1370 | if (unlikely(!frame)) | |
1371 | return -EOVERFLOW; | |
1372 | ||
42421a56 | 1373 | return tun_xdp_xmit(dev, 1, &frame, XDP_XMIT_FLUSH); |
fc72d1d5 JW |
1374 | } |
1375 | ||
758e43b7 | 1376 | static const struct net_device_ops tap_netdev_ops = { |
c70f1829 | 1377 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1378 | .ndo_open = tun_net_open, |
1379 | .ndo_stop = tun_net_close, | |
00829823 | 1380 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1381 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 1382 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
1383 | .ndo_set_mac_address = eth_mac_addr, |
1384 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 1385 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1386 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1387 | .ndo_poll_controller = tun_poll_controller, | |
1388 | #endif | |
5e52796a | 1389 | .ndo_features_check = passthru_features_check, |
eaea34b2 | 1390 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1391 | .ndo_get_stats64 = tun_net_get_stats64, |
f4e63525 | 1392 | .ndo_bpf = tun_xdp, |
fc72d1d5 | 1393 | .ndo_xdp_xmit = tun_xdp_xmit, |
758e43b7 SH |
1394 | }; |
1395 | ||
944a1376 | 1396 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
1397 | { |
1398 | int i; | |
1399 | ||
96442e42 JW |
1400 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
1401 | INIT_HLIST_HEAD(&tun->flows[i]); | |
1402 | ||
1403 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
e99e88a9 KC |
1404 | timer_setup(&tun->flow_gc_timer, tun_flow_cleanup, 0); |
1405 | mod_timer(&tun->flow_gc_timer, | |
1406 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
1407 | } |
1408 | ||
1409 | static void tun_flow_uninit(struct tun_struct *tun) | |
1410 | { | |
1411 | del_timer_sync(&tun->flow_gc_timer); | |
1412 | tun_flow_flush(tun); | |
96442e42 JW |
1413 | } |
1414 | ||
91572088 JW |
1415 | #define MIN_MTU 68 |
1416 | #define MAX_MTU 65535 | |
1417 | ||
1da177e4 LT |
1418 | /* Initialize net device. */ |
1419 | static void tun_net_init(struct net_device *dev) | |
1420 | { | |
1421 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 1422 | |
1da177e4 | 1423 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 1424 | case IFF_TUN: |
758e43b7 SH |
1425 | dev->netdev_ops = &tun_netdev_ops; |
1426 | ||
1da177e4 LT |
1427 | /* Point-to-Point TUN Device */ |
1428 | dev->hard_header_len = 0; | |
1429 | dev->addr_len = 0; | |
1430 | dev->mtu = 1500; | |
1431 | ||
1432 | /* Zero header length */ | |
6aa20a22 | 1433 | dev->type = ARPHRD_NONE; |
1da177e4 | 1434 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
1da177e4 LT |
1435 | break; |
1436 | ||
40630b82 | 1437 | case IFF_TAP: |
7a0a9608 | 1438 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 1439 | /* Ethernet TAP Device */ |
1da177e4 | 1440 | ether_setup(dev); |
550fd08c | 1441 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 1442 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 1443 | |
f2cedb63 | 1444 | eth_hw_addr_random(dev); |
36226a8d | 1445 | |
1da177e4 LT |
1446 | break; |
1447 | } | |
91572088 JW |
1448 | |
1449 | dev->min_mtu = MIN_MTU; | |
1450 | dev->max_mtu = MAX_MTU - dev->hard_header_len; | |
1da177e4 LT |
1451 | } |
1452 | ||
2f3ab622 JW |
1453 | static bool tun_sock_writeable(struct tun_struct *tun, struct tun_file *tfile) |
1454 | { | |
1455 | struct sock *sk = tfile->socket.sk; | |
1456 | ||
1457 | return (tun->dev->flags & IFF_UP) && sock_writeable(sk); | |
1458 | } | |
1459 | ||
1da177e4 LT |
1460 | /* Character device part */ |
1461 | ||
1462 | /* Poll */ | |
afc9a42b | 1463 | static __poll_t tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 1464 | { |
b2430de3 | 1465 | struct tun_file *tfile = file->private_data; |
9484dc74 | 1466 | struct tun_struct *tun = tun_get(tfile); |
3c8a9c63 | 1467 | struct sock *sk; |
afc9a42b | 1468 | __poll_t mask = 0; |
1da177e4 LT |
1469 | |
1470 | if (!tun) | |
a9a08845 | 1471 | return EPOLLERR; |
1da177e4 | 1472 | |
54f968d6 | 1473 | sk = tfile->socket.sk; |
3c8a9c63 | 1474 | |
6b8a66ee | 1475 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 1476 | |
9e641bdc | 1477 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 1478 | |
5990a305 | 1479 | if (!ptr_ring_empty(&tfile->tx_ring)) |
a9a08845 | 1480 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 | 1481 | |
2f3ab622 JW |
1482 | /* Make sure SOCKWQ_ASYNC_NOSPACE is set if not writable to |
1483 | * guarantee EPOLLOUT to be raised by either here or | |
1484 | * tun_sock_write_space(). Then process could get notification | |
1485 | * after it writes to a down device and meets -EIO. | |
1486 | */ | |
1487 | if (tun_sock_writeable(tun, tfile) || | |
1488 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
1489 | tun_sock_writeable(tun, tfile))) | |
a9a08845 | 1490 | mask |= EPOLLOUT | EPOLLWRNORM; |
33dccbb0 | 1491 | |
c70f1829 | 1492 | if (tun->dev->reg_state != NETREG_REGISTERED) |
a9a08845 | 1493 | mask = EPOLLERR; |
c70f1829 | 1494 | |
631ab46b | 1495 | tun_put(tun); |
1da177e4 LT |
1496 | return mask; |
1497 | } | |
1498 | ||
90e33d45 PP |
1499 | static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile, |
1500 | size_t len, | |
1501 | const struct iov_iter *it) | |
1502 | { | |
1503 | struct sk_buff *skb; | |
1504 | size_t linear; | |
1505 | int err; | |
1506 | int i; | |
1507 | ||
1508 | if (it->nr_segs > MAX_SKB_FRAGS + 1) | |
1509 | return ERR_PTR(-ENOMEM); | |
1510 | ||
1511 | local_bh_disable(); | |
1512 | skb = napi_get_frags(&tfile->napi); | |
1513 | local_bh_enable(); | |
1514 | if (!skb) | |
1515 | return ERR_PTR(-ENOMEM); | |
1516 | ||
1517 | linear = iov_iter_single_seg_count(it); | |
1518 | err = __skb_grow(skb, linear); | |
1519 | if (err) | |
1520 | goto free; | |
1521 | ||
1522 | skb->len = len; | |
1523 | skb->data_len = len - linear; | |
1524 | skb->truesize += skb->data_len; | |
1525 | ||
1526 | for (i = 1; i < it->nr_segs; i++) { | |
43a08e0f | 1527 | struct page_frag *pfrag = ¤t->task_frag; |
90e33d45 | 1528 | size_t fragsz = it->iov[i].iov_len; |
90e33d45 PP |
1529 | |
1530 | if (fragsz == 0 || fragsz > PAGE_SIZE) { | |
1531 | err = -EINVAL; | |
1532 | goto free; | |
1533 | } | |
1534 | ||
43a08e0f | 1535 | if (!skb_page_frag_refill(fragsz, pfrag, GFP_KERNEL)) { |
90e33d45 PP |
1536 | err = -ENOMEM; |
1537 | goto free; | |
1538 | } | |
1539 | ||
43a08e0f ED |
1540 | skb_fill_page_desc(skb, i - 1, pfrag->page, |
1541 | pfrag->offset, fragsz); | |
1542 | page_ref_inc(pfrag->page); | |
1543 | pfrag->offset += fragsz; | |
90e33d45 PP |
1544 | } |
1545 | ||
1546 | return skb; | |
1547 | free: | |
1548 | /* frees skb and all frags allocated with napi_alloc_frag() */ | |
1549 | napi_free_frags(&tfile->napi); | |
1550 | return ERR_PTR(err); | |
1551 | } | |
1552 | ||
f42157cb RR |
1553 | /* prepad is the amount to reserve at front. len is length after that. |
1554 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1555 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1556 | size_t prepad, size_t len, |
1557 | size_t linear, int noblock) | |
f42157cb | 1558 | { |
54f968d6 | 1559 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1560 | struct sk_buff *skb; |
33dccbb0 | 1561 | int err; |
f42157cb RR |
1562 | |
1563 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1564 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1565 | linear = len; |
f42157cb | 1566 | |
33dccbb0 | 1567 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1568 | &err, 0); |
f42157cb | 1569 | if (!skb) |
33dccbb0 | 1570 | return ERR_PTR(err); |
f42157cb RR |
1571 | |
1572 | skb_reserve(skb, prepad); | |
1573 | skb_put(skb, linear); | |
33dccbb0 HX |
1574 | skb->data_len = len - linear; |
1575 | skb->len += len - linear; | |
f42157cb RR |
1576 | |
1577 | return skb; | |
1578 | } | |
1579 | ||
5503fcec JW |
1580 | static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile, |
1581 | struct sk_buff *skb, int more) | |
1582 | { | |
1583 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
1584 | struct sk_buff_head process_queue; | |
1585 | u32 rx_batched = tun->rx_batched; | |
1586 | bool rcv = false; | |
1587 | ||
1588 | if (!rx_batched || (!more && skb_queue_empty(queue))) { | |
1589 | local_bh_disable(); | |
1590 | netif_receive_skb(skb); | |
1591 | local_bh_enable(); | |
1592 | return; | |
1593 | } | |
1594 | ||
1595 | spin_lock(&queue->lock); | |
1596 | if (!more || skb_queue_len(queue) == rx_batched) { | |
1597 | __skb_queue_head_init(&process_queue); | |
1598 | skb_queue_splice_tail_init(queue, &process_queue); | |
1599 | rcv = true; | |
1600 | } else { | |
1601 | __skb_queue_tail(queue, skb); | |
1602 | } | |
1603 | spin_unlock(&queue->lock); | |
1604 | ||
1605 | if (rcv) { | |
1606 | struct sk_buff *nskb; | |
1607 | ||
1608 | local_bh_disable(); | |
1609 | while ((nskb = __skb_dequeue(&process_queue))) | |
1610 | netif_receive_skb(nskb); | |
1611 | netif_receive_skb(skb); | |
1612 | local_bh_enable(); | |
1613 | } | |
1614 | } | |
1615 | ||
66ccbc9c JW |
1616 | static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, |
1617 | int len, int noblock, bool zerocopy) | |
1618 | { | |
1619 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) | |
1620 | return false; | |
1621 | ||
1622 | if (tfile->socket.sk->sk_sndbuf != INT_MAX) | |
1623 | return false; | |
1624 | ||
1625 | if (!noblock) | |
1626 | return false; | |
1627 | ||
1628 | if (zerocopy) | |
1629 | return false; | |
1630 | ||
1631 | if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + | |
1632 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
1633 | return false; | |
1634 | ||
1635 | return true; | |
1636 | } | |
1637 | ||
761876c8 JW |
1638 | static struct sk_buff *tun_build_skb(struct tun_struct *tun, |
1639 | struct tun_file *tfile, | |
66ccbc9c | 1640 | struct iov_iter *from, |
761876c8 | 1641 | struct virtio_net_hdr *hdr, |
1cfe6e93 | 1642 | int len, int *skb_xdp) |
66ccbc9c | 1643 | { |
0bbd7dad | 1644 | struct page_frag *alloc_frag = ¤t->task_frag; |
66ccbc9c | 1645 | struct sk_buff *skb; |
761876c8 | 1646 | struct bpf_prog *xdp_prog; |
7df13219 | 1647 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
761876c8 | 1648 | unsigned int delta = 0; |
66ccbc9c JW |
1649 | char *buf; |
1650 | size_t copied; | |
7df13219 JW |
1651 | int err, pad = TUN_RX_PAD; |
1652 | ||
1653 | rcu_read_lock(); | |
1654 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1655 | if (xdp_prog) | |
4f23aff8 | 1656 | pad += XDP_PACKET_HEADROOM; |
7df13219 JW |
1657 | buflen += SKB_DATA_ALIGN(len + pad); |
1658 | rcu_read_unlock(); | |
66ccbc9c | 1659 | |
63b9ab65 | 1660 | alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); |
66ccbc9c JW |
1661 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) |
1662 | return ERR_PTR(-ENOMEM); | |
1663 | ||
1664 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
1665 | copied = copy_page_from_iter(alloc_frag->page, | |
7df13219 | 1666 | alloc_frag->offset + pad, |
66ccbc9c JW |
1667 | len, from); |
1668 | if (copied != len) | |
1669 | return ERR_PTR(-EFAULT); | |
1670 | ||
7df13219 JW |
1671 | /* There's a small window that XDP may be set after the check |
1672 | * of xdp_prog above, this should be rare and for simplicity | |
1673 | * we do XDP on skb in case the headroom is not enough. | |
1674 | */ | |
1675 | if (hdr->gso_type || !xdp_prog) | |
1cfe6e93 | 1676 | *skb_xdp = 1; |
761876c8 | 1677 | else |
1cfe6e93 | 1678 | *skb_xdp = 0; |
761876c8 | 1679 | |
6547e387 | 1680 | local_bh_disable(); |
761876c8 JW |
1681 | rcu_read_lock(); |
1682 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1cfe6e93 | 1683 | if (xdp_prog && !*skb_xdp) { |
761876c8 JW |
1684 | struct xdp_buff xdp; |
1685 | void *orig_data; | |
1686 | u32 act; | |
1687 | ||
1688 | xdp.data_hard_start = buf; | |
7df13219 | 1689 | xdp.data = buf + pad; |
de8f3a83 | 1690 | xdp_set_data_meta_invalid(&xdp); |
761876c8 | 1691 | xdp.data_end = xdp.data + len; |
8bf5c4ee | 1692 | xdp.rxq = &tfile->xdp_rxq; |
761876c8 JW |
1693 | orig_data = xdp.data; |
1694 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
1695 | ||
1696 | switch (act) { | |
1697 | case XDP_REDIRECT: | |
1698 | get_page(alloc_frag->page); | |
1699 | alloc_frag->offset += buflen; | |
1700 | err = xdp_do_redirect(tun->dev, &xdp, xdp_prog); | |
1bb4f2e8 | 1701 | xdp_do_flush_map(); |
761876c8 JW |
1702 | if (err) |
1703 | goto err_redirect; | |
654d5738 | 1704 | rcu_read_unlock(); |
6547e387 | 1705 | local_bh_enable(); |
761876c8 JW |
1706 | return NULL; |
1707 | case XDP_TX: | |
59655a5b JW |
1708 | get_page(alloc_frag->page); |
1709 | alloc_frag->offset += buflen; | |
6e8cfd6d | 1710 | if (tun_xdp_tx(tun->dev, &xdp) < 0) |
59655a5b | 1711 | goto err_redirect; |
59655a5b | 1712 | rcu_read_unlock(); |
6547e387 | 1713 | local_bh_enable(); |
59655a5b | 1714 | return NULL; |
761876c8 JW |
1715 | case XDP_PASS: |
1716 | delta = orig_data - xdp.data; | |
8fb58f1e | 1717 | len = xdp.data_end - xdp.data; |
761876c8 JW |
1718 | break; |
1719 | default: | |
1720 | bpf_warn_invalid_xdp_action(act); | |
1721 | /* fall through */ | |
1722 | case XDP_ABORTED: | |
1723 | trace_xdp_exception(tun->dev, xdp_prog, act); | |
1724 | /* fall through */ | |
1725 | case XDP_DROP: | |
1726 | goto err_xdp; | |
1727 | } | |
1728 | } | |
1729 | ||
66ccbc9c | 1730 | skb = build_skb(buf, buflen); |
761876c8 JW |
1731 | if (!skb) { |
1732 | rcu_read_unlock(); | |
6547e387 | 1733 | local_bh_enable(); |
66ccbc9c | 1734 | return ERR_PTR(-ENOMEM); |
761876c8 | 1735 | } |
66ccbc9c | 1736 | |
7df13219 | 1737 | skb_reserve(skb, pad - delta); |
8fb58f1e | 1738 | skb_put(skb, len); |
66ccbc9c JW |
1739 | get_page(alloc_frag->page); |
1740 | alloc_frag->offset += buflen; | |
1741 | ||
761876c8 | 1742 | rcu_read_unlock(); |
6547e387 | 1743 | local_bh_enable(); |
761876c8 | 1744 | |
66ccbc9c | 1745 | return skb; |
761876c8 JW |
1746 | |
1747 | err_redirect: | |
1748 | put_page(alloc_frag->page); | |
1749 | err_xdp: | |
1750 | rcu_read_unlock(); | |
6547e387 | 1751 | local_bh_enable(); |
761876c8 JW |
1752 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
1753 | return NULL; | |
66ccbc9c JW |
1754 | } |
1755 | ||
1da177e4 | 1756 | /* Get packet from user space buffer */ |
54f968d6 | 1757 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 | 1758 | void *msg_control, struct iov_iter *from, |
5503fcec | 1759 | int noblock, bool more) |
1da177e4 | 1760 | { |
09640e63 | 1761 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1762 | struct sk_buff *skb; |
f5ff53b4 | 1763 | size_t total_len = iov_iter_count(from); |
eaea34b2 | 1764 | size_t len = total_len, align = tun->align, linear; |
f43798c2 | 1765 | struct virtio_net_hdr gso = { 0 }; |
608b9977 | 1766 | struct tun_pcpu_stats *stats; |
96f8d9ec | 1767 | int good_linear; |
0690899b MT |
1768 | int copylen; |
1769 | bool zerocopy = false; | |
1770 | int err; | |
96f84061 | 1771 | u32 rxhash = 0; |
1cfe6e93 | 1772 | int skb_xdp = 1; |
90e33d45 | 1773 | bool frags = tun_napi_frags_enabled(tun); |
1da177e4 | 1774 | |
1bd4978a ED |
1775 | if (!(tun->dev->flags & IFF_UP)) |
1776 | return -EIO; | |
1777 | ||
40630b82 | 1778 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1779 | if (len < sizeof(pi)) |
1da177e4 | 1780 | return -EINVAL; |
15718ea0 | 1781 | len -= sizeof(pi); |
1da177e4 | 1782 | |
cbbd26b8 | 1783 | if (!copy_from_iter_full(&pi, sizeof(pi), from)) |
1da177e4 LT |
1784 | return -EFAULT; |
1785 | } | |
1786 | ||
40630b82 | 1787 | if (tun->flags & IFF_VNET_HDR) { |
e1edab87 WB |
1788 | int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1789 | ||
1790 | if (len < vnet_hdr_sz) | |
f43798c2 | 1791 | return -EINVAL; |
e1edab87 | 1792 | len -= vnet_hdr_sz; |
f43798c2 | 1793 | |
cbbd26b8 | 1794 | if (!copy_from_iter_full(&gso, sizeof(gso), from)) |
f43798c2 RR |
1795 | return -EFAULT; |
1796 | ||
4909122f | 1797 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1798 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1799 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1800 | |
56f0dcc5 | 1801 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1802 | return -EINVAL; |
e1edab87 | 1803 | iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1804 | } |
1805 | ||
40630b82 | 1806 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1807 | align += NET_IP_ALIGN; |
0eca93bc | 1808 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1809 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1810 | return -EINVAL; |
1811 | } | |
6aa20a22 | 1812 | |
96f8d9ec JW |
1813 | good_linear = SKB_MAX_HEAD(align); |
1814 | ||
88529176 | 1815 | if (msg_control) { |
f5ff53b4 AV |
1816 | struct iov_iter i = *from; |
1817 | ||
88529176 JW |
1818 | /* There are 256 bytes to be copied in skb, so there is |
1819 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1820 | * The rest of the buffer is mapped from userspace. |
1821 | */ | |
56f0dcc5 | 1822 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1823 | if (copylen > good_linear) |
1824 | copylen = good_linear; | |
3dd5c330 | 1825 | linear = copylen; |
f5ff53b4 AV |
1826 | iov_iter_advance(&i, copylen); |
1827 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1828 | zerocopy = true; |
1829 | } | |
1830 | ||
90e33d45 | 1831 | if (!frags && tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) { |
1cfe6e93 JW |
1832 | /* For the packet that is not easy to be processed |
1833 | * (e.g gso or jumbo packet), we will do it at after | |
1834 | * skb was created with generic XDP routine. | |
1835 | */ | |
1836 | skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp); | |
66ccbc9c | 1837 | if (IS_ERR(skb)) { |
608b9977 | 1838 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
66ccbc9c JW |
1839 | return PTR_ERR(skb); |
1840 | } | |
761876c8 JW |
1841 | if (!skb) |
1842 | return total_len; | |
66ccbc9c JW |
1843 | } else { |
1844 | if (!zerocopy) { | |
1845 | copylen = len; | |
1846 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) | |
1847 | linear = good_linear; | |
1848 | else | |
1849 | linear = tun16_to_cpu(tun, gso.hdr_len); | |
1850 | } | |
1da177e4 | 1851 | |
90e33d45 PP |
1852 | if (frags) { |
1853 | mutex_lock(&tfile->napi_mutex); | |
1854 | skb = tun_napi_alloc_frags(tfile, copylen, from); | |
1855 | /* tun_napi_alloc_frags() enforces a layout for the skb. | |
1856 | * If zerocopy is enabled, then this layout will be | |
1857 | * overwritten by zerocopy_sg_from_iter(). | |
1858 | */ | |
1859 | zerocopy = false; | |
1860 | } else { | |
1861 | skb = tun_alloc_skb(tfile, align, copylen, linear, | |
1862 | noblock); | |
1863 | } | |
1864 | ||
66ccbc9c JW |
1865 | if (IS_ERR(skb)) { |
1866 | if (PTR_ERR(skb) != -EAGAIN) | |
1867 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
90e33d45 PP |
1868 | if (frags) |
1869 | mutex_unlock(&tfile->napi_mutex); | |
66ccbc9c JW |
1870 | return PTR_ERR(skb); |
1871 | } | |
0690899b | 1872 | |
66ccbc9c JW |
1873 | if (zerocopy) |
1874 | err = zerocopy_sg_from_iter(skb, from); | |
1875 | else | |
1876 | err = skb_copy_datagram_from_iter(skb, 0, from, len); | |
1877 | ||
1878 | if (err) { | |
1879 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1880 | kfree_skb(skb); | |
90e33d45 PP |
1881 | if (frags) { |
1882 | tfile->napi.skb = NULL; | |
1883 | mutex_unlock(&tfile->napi_mutex); | |
1884 | } | |
1885 | ||
66ccbc9c JW |
1886 | return -EFAULT; |
1887 | } | |
8f22757e | 1888 | } |
1da177e4 | 1889 | |
3e9e40e7 | 1890 | if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { |
df10db98 PA |
1891 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); |
1892 | kfree_skb(skb); | |
90e33d45 PP |
1893 | if (frags) { |
1894 | tfile->napi.skb = NULL; | |
1895 | mutex_unlock(&tfile->napi_mutex); | |
1896 | } | |
1897 | ||
df10db98 PA |
1898 | return -EINVAL; |
1899 | } | |
1900 | ||
1da177e4 | 1901 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1902 | case IFF_TUN: |
1903 | if (tun->flags & IFF_NO_PI) { | |
2580c4c1 AP |
1904 | u8 ip_version = skb->len ? (skb->data[0] >> 4) : 0; |
1905 | ||
1906 | switch (ip_version) { | |
1907 | case 4: | |
f09f7ee2 AWC |
1908 | pi.proto = htons(ETH_P_IP); |
1909 | break; | |
2580c4c1 | 1910 | case 6: |
f09f7ee2 AWC |
1911 | pi.proto = htons(ETH_P_IPV6); |
1912 | break; | |
1913 | default: | |
608b9977 | 1914 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
f09f7ee2 AWC |
1915 | kfree_skb(skb); |
1916 | return -EINVAL; | |
1917 | } | |
1918 | } | |
1919 | ||
459a98ed | 1920 | skb_reset_mac_header(skb); |
1da177e4 | 1921 | skb->protocol = pi.proto; |
4c13eb66 | 1922 | skb->dev = tun->dev; |
1da177e4 | 1923 | break; |
40630b82 | 1924 | case IFF_TAP: |
90e33d45 PP |
1925 | if (!frags) |
1926 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1da177e4 | 1927 | break; |
6403eab1 | 1928 | } |
1da177e4 | 1929 | |
0690899b MT |
1930 | /* copy skb_ubuf_info for callback when skb has no error */ |
1931 | if (zerocopy) { | |
1932 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1933 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1934 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
af1cc7a2 JW |
1935 | } else if (msg_control) { |
1936 | struct ubuf_info *uarg = msg_control; | |
1937 | uarg->callback(uarg, false); | |
0690899b MT |
1938 | } |
1939 | ||
72f65107 | 1940 | skb_reset_network_header(skb); |
40893fd0 | 1941 | skb_probe_transport_header(skb, 0); |
38502af7 | 1942 | |
1cfe6e93 | 1943 | if (skb_xdp) { |
761876c8 JW |
1944 | struct bpf_prog *xdp_prog; |
1945 | int ret; | |
1946 | ||
6547e387 | 1947 | local_bh_disable(); |
761876c8 JW |
1948 | rcu_read_lock(); |
1949 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1950 | if (xdp_prog) { | |
1951 | ret = do_xdp_generic(xdp_prog, skb); | |
1952 | if (ret != XDP_PASS) { | |
1953 | rcu_read_unlock(); | |
6547e387 | 1954 | local_bh_enable(); |
761876c8 JW |
1955 | return total_len; |
1956 | } | |
1957 | } | |
1958 | rcu_read_unlock(); | |
6547e387 | 1959 | local_bh_enable(); |
761876c8 JW |
1960 | } |
1961 | ||
cf1a1e07 PA |
1962 | /* Compute the costly rx hash only if needed for flow updates. |
1963 | * We may get a very small possibility of OOO during switching, not | |
1964 | * worth to optimize. | |
1965 | */ | |
1966 | if (!rcu_access_pointer(tun->steering_prog) && tun->numqueues > 1 && | |
1967 | !tfile->detached) | |
96f84061 | 1968 | rxhash = __skb_get_hash_symmetric(skb); |
94317099 | 1969 | |
90e33d45 PP |
1970 | if (frags) { |
1971 | /* Exercise flow dissector code path. */ | |
1972 | u32 headlen = eth_get_headlen(skb->data, skb_headlen(skb)); | |
1973 | ||
010f245b | 1974 | if (unlikely(headlen > skb_headlen(skb))) { |
90e33d45 PP |
1975 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
1976 | napi_free_frags(&tfile->napi); | |
1977 | mutex_unlock(&tfile->napi_mutex); | |
1978 | WARN_ON(1); | |
1979 | return -ENOMEM; | |
1980 | } | |
1981 | ||
1982 | local_bh_disable(); | |
1983 | napi_gro_frags(&tfile->napi); | |
1984 | local_bh_enable(); | |
1985 | mutex_unlock(&tfile->napi_mutex); | |
aec72f33 | 1986 | } else if (tfile->napi_enabled) { |
94317099 PP |
1987 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; |
1988 | int queue_len; | |
1989 | ||
1990 | spin_lock_bh(&queue->lock); | |
1991 | __skb_queue_tail(queue, skb); | |
1992 | queue_len = skb_queue_len(queue); | |
1993 | spin_unlock(&queue->lock); | |
1994 | ||
1995 | if (!more || queue_len > NAPI_POLL_WEIGHT) | |
1996 | napi_schedule(&tfile->napi); | |
1997 | ||
1998 | local_bh_enable(); | |
1999 | } else if (!IS_ENABLED(CONFIG_4KSTACKS)) { | |
2000 | tun_rx_batched(tun, tfile, skb, more); | |
2001 | } else { | |
2002 | netif_rx_ni(skb); | |
2003 | } | |
6aa20a22 | 2004 | |
608b9977 PA |
2005 | stats = get_cpu_ptr(tun->pcpu_stats); |
2006 | u64_stats_update_begin(&stats->syncp); | |
2007 | stats->rx_packets++; | |
2008 | stats->rx_bytes += len; | |
2009 | u64_stats_update_end(&stats->syncp); | |
2010 | put_cpu_ptr(stats); | |
1da177e4 | 2011 | |
96f84061 JW |
2012 | if (rxhash) |
2013 | tun_flow_update(tun, rxhash, tfile); | |
2014 | ||
0690899b | 2015 | return total_len; |
6aa20a22 | 2016 | } |
1da177e4 | 2017 | |
f5ff53b4 | 2018 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 2019 | { |
33dccbb0 | 2020 | struct file *file = iocb->ki_filp; |
54f968d6 | 2021 | struct tun_file *tfile = file->private_data; |
9484dc74 | 2022 | struct tun_struct *tun = tun_get(tfile); |
631ab46b | 2023 | ssize_t result; |
1da177e4 LT |
2024 | |
2025 | if (!tun) | |
2026 | return -EBADFD; | |
2027 | ||
5503fcec JW |
2028 | result = tun_get_user(tun, tfile, NULL, from, |
2029 | file->f_flags & O_NONBLOCK, false); | |
631ab46b EB |
2030 | |
2031 | tun_put(tun); | |
2032 | return result; | |
1da177e4 LT |
2033 | } |
2034 | ||
fc72d1d5 JW |
2035 | static ssize_t tun_put_user_xdp(struct tun_struct *tun, |
2036 | struct tun_file *tfile, | |
1ffcbc85 | 2037 | struct xdp_frame *xdp_frame, |
fc72d1d5 JW |
2038 | struct iov_iter *iter) |
2039 | { | |
2040 | int vnet_hdr_sz = 0; | |
1ffcbc85 | 2041 | size_t size = xdp_frame->len; |
fc72d1d5 JW |
2042 | struct tun_pcpu_stats *stats; |
2043 | size_t ret; | |
2044 | ||
2045 | if (tun->flags & IFF_VNET_HDR) { | |
2046 | struct virtio_net_hdr gso = { 0 }; | |
2047 | ||
2048 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); | |
2049 | if (unlikely(iov_iter_count(iter) < vnet_hdr_sz)) | |
2050 | return -EINVAL; | |
2051 | if (unlikely(copy_to_iter(&gso, sizeof(gso), iter) != | |
2052 | sizeof(gso))) | |
2053 | return -EFAULT; | |
2054 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
2055 | } | |
2056 | ||
1ffcbc85 | 2057 | ret = copy_to_iter(xdp_frame->data, size, iter) + vnet_hdr_sz; |
fc72d1d5 JW |
2058 | |
2059 | stats = get_cpu_ptr(tun->pcpu_stats); | |
2060 | u64_stats_update_begin(&stats->syncp); | |
2061 | stats->tx_packets++; | |
2062 | stats->tx_bytes += ret; | |
2063 | u64_stats_update_end(&stats->syncp); | |
2064 | put_cpu_ptr(tun->pcpu_stats); | |
2065 | ||
2066 | return ret; | |
2067 | } | |
2068 | ||
1da177e4 | 2069 | /* Put packet to the user space buffer */ |
6f7c156c | 2070 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 2071 | struct tun_file *tfile, |
6f7c156c | 2072 | struct sk_buff *skb, |
e0b46d0e | 2073 | struct iov_iter *iter) |
1da177e4 LT |
2074 | { |
2075 | struct tun_pi pi = { 0, skb->protocol }; | |
608b9977 | 2076 | struct tun_pcpu_stats *stats; |
e0b46d0e | 2077 | ssize_t total; |
8c847d25 | 2078 | int vlan_offset = 0; |
a8f9bfdf | 2079 | int vlan_hlen = 0; |
2eb783c4 | 2080 | int vnet_hdr_sz = 0; |
a8f9bfdf | 2081 | |
df8a39de | 2082 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 2083 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 2084 | |
40630b82 | 2085 | if (tun->flags & IFF_VNET_HDR) |
e1edab87 | 2086 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1da177e4 | 2087 | |
e0b46d0e HX |
2088 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
2089 | ||
40630b82 | 2090 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 2091 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
2092 | return -EINVAL; |
2093 | ||
e0b46d0e HX |
2094 | total += sizeof(pi); |
2095 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
2096 | /* Packet will be striped */ |
2097 | pi.flags |= TUN_PKT_STRIP; | |
2098 | } | |
6aa20a22 | 2099 | |
e0b46d0e | 2100 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 2101 | return -EFAULT; |
6aa20a22 | 2102 | } |
1da177e4 | 2103 | |
2eb783c4 | 2104 | if (vnet_hdr_sz) { |
9403cd7c | 2105 | struct virtio_net_hdr gso; |
34166093 | 2106 | |
e0b46d0e | 2107 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
2108 | return -EINVAL; |
2109 | ||
3e9e40e7 | 2110 | if (virtio_net_hdr_from_skb(skb, &gso, |
fd3a8862 WB |
2111 | tun_is_little_endian(tun), true, |
2112 | vlan_hlen)) { | |
f43798c2 | 2113 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
34166093 MR |
2114 | pr_err("unexpected GSO type: " |
2115 | "0x%x, gso_size %d, hdr_len %d\n", | |
2116 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), | |
2117 | tun16_to_cpu(tun, gso.hdr_len)); | |
2118 | print_hex_dump(KERN_ERR, "tun: ", | |
2119 | DUMP_PREFIX_NONE, | |
2120 | 16, 1, skb->head, | |
2121 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); | |
2122 | WARN_ON_ONCE(1); | |
2123 | return -EINVAL; | |
2124 | } | |
f43798c2 | 2125 | |
e0b46d0e | 2126 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 2127 | return -EFAULT; |
8c847d25 JW |
2128 | |
2129 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
2130 | } |
2131 | ||
a8f9bfdf | 2132 | if (vlan_hlen) { |
e0b46d0e | 2133 | int ret; |
aff3d70a | 2134 | struct veth veth; |
6680ec68 JW |
2135 | |
2136 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 2137 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
2138 | |
2139 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 2140 | |
e0b46d0e HX |
2141 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
2142 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
2143 | goto done; |
2144 | ||
e0b46d0e HX |
2145 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
2146 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
2147 | goto done; |
2148 | } | |
1da177e4 | 2149 | |
e0b46d0e | 2150 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 2151 | |
6680ec68 | 2152 | done: |
608b9977 PA |
2153 | /* caller is in process context, */ |
2154 | stats = get_cpu_ptr(tun->pcpu_stats); | |
2155 | u64_stats_update_begin(&stats->syncp); | |
2156 | stats->tx_packets++; | |
2157 | stats->tx_bytes += skb->len + vlan_hlen; | |
2158 | u64_stats_update_end(&stats->syncp); | |
2159 | put_cpu_ptr(tun->pcpu_stats); | |
1da177e4 LT |
2160 | |
2161 | return total; | |
2162 | } | |
2163 | ||
fc72d1d5 | 2164 | static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err) |
1576d986 JW |
2165 | { |
2166 | DECLARE_WAITQUEUE(wait, current); | |
fc72d1d5 | 2167 | void *ptr = NULL; |
f48cc6b2 | 2168 | int error = 0; |
1576d986 | 2169 | |
fc72d1d5 JW |
2170 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2171 | if (ptr) | |
1576d986 JW |
2172 | goto out; |
2173 | if (noblock) { | |
f48cc6b2 | 2174 | error = -EAGAIN; |
1576d986 JW |
2175 | goto out; |
2176 | } | |
2177 | ||
2178 | add_wait_queue(&tfile->wq.wait, &wait); | |
2179 | current->state = TASK_INTERRUPTIBLE; | |
2180 | ||
2181 | while (1) { | |
fc72d1d5 JW |
2182 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2183 | if (ptr) | |
1576d986 JW |
2184 | break; |
2185 | if (signal_pending(current)) { | |
f48cc6b2 | 2186 | error = -ERESTARTSYS; |
1576d986 JW |
2187 | break; |
2188 | } | |
2189 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { | |
f48cc6b2 | 2190 | error = -EFAULT; |
1576d986 JW |
2191 | break; |
2192 | } | |
2193 | ||
2194 | schedule(); | |
2195 | } | |
2196 | ||
2197 | current->state = TASK_RUNNING; | |
2198 | remove_wait_queue(&tfile->wq.wait, &wait); | |
2199 | ||
2200 | out: | |
f48cc6b2 | 2201 | *err = error; |
fc72d1d5 | 2202 | return ptr; |
1576d986 JW |
2203 | } |
2204 | ||
54f968d6 | 2205 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 | 2206 | struct iov_iter *to, |
fc72d1d5 | 2207 | int noblock, void *ptr) |
1da177e4 | 2208 | { |
9b067034 | 2209 | ssize_t ret; |
1576d986 | 2210 | int err; |
1da177e4 | 2211 | |
3872baf6 | 2212 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 2213 | |
c33ee15b | 2214 | if (!iov_iter_count(to)) { |
fc72d1d5 | 2215 | tun_ptr_free(ptr); |
9b067034 | 2216 | return 0; |
c33ee15b | 2217 | } |
1da177e4 | 2218 | |
fc72d1d5 | 2219 | if (!ptr) { |
ac77cfd4 | 2220 | /* Read frames from ring */ |
fc72d1d5 JW |
2221 | ptr = tun_ring_recv(tfile, noblock, &err); |
2222 | if (!ptr) | |
ac77cfd4 JW |
2223 | return err; |
2224 | } | |
e0b46d0e | 2225 | |
1ffcbc85 JDB |
2226 | if (tun_is_xdp_frame(ptr)) { |
2227 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2228 | |
1ffcbc85 | 2229 | ret = tun_put_user_xdp(tun, tfile, xdpf, to); |
03993094 | 2230 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
2231 | } else { |
2232 | struct sk_buff *skb = ptr; | |
2233 | ||
2234 | ret = tun_put_user(tun, tfile, skb, to); | |
2235 | if (unlikely(ret < 0)) | |
2236 | kfree_skb(skb); | |
2237 | else | |
2238 | consume_skb(skb); | |
2239 | } | |
1da177e4 | 2240 | |
05c2828c MT |
2241 | return ret; |
2242 | } | |
2243 | ||
9b067034 | 2244 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
2245 | { |
2246 | struct file *file = iocb->ki_filp; | |
2247 | struct tun_file *tfile = file->private_data; | |
9484dc74 | 2248 | struct tun_struct *tun = tun_get(tfile); |
9b067034 | 2249 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
2250 | |
2251 | if (!tun) | |
2252 | return -EBADFD; | |
ac77cfd4 | 2253 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL); |
42404c09 | 2254 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
2255 | if (ret > 0) |
2256 | iocb->ki_pos = ret; | |
631ab46b | 2257 | tun_put(tun); |
1da177e4 LT |
2258 | return ret; |
2259 | } | |
2260 | ||
cd5681d7 | 2261 | static void tun_prog_free(struct rcu_head *rcu) |
96f84061 | 2262 | { |
cd5681d7 | 2263 | struct tun_prog *prog = container_of(rcu, struct tun_prog, rcu); |
96f84061 JW |
2264 | |
2265 | bpf_prog_destroy(prog->prog); | |
2266 | kfree(prog); | |
2267 | } | |
2268 | ||
9d6474e4 JW |
2269 | static int __tun_set_ebpf(struct tun_struct *tun, |
2270 | struct tun_prog __rcu **prog_p, | |
cd5681d7 | 2271 | struct bpf_prog *prog) |
96f84061 | 2272 | { |
cd5681d7 | 2273 | struct tun_prog *old, *new = NULL; |
96f84061 JW |
2274 | |
2275 | if (prog) { | |
2276 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2277 | if (!new) | |
2278 | return -ENOMEM; | |
2279 | new->prog = prog; | |
2280 | } | |
2281 | ||
124da8f6 | 2282 | spin_lock_bh(&tun->lock); |
cd5681d7 | 2283 | old = rcu_dereference_protected(*prog_p, |
124da8f6 | 2284 | lockdep_is_held(&tun->lock)); |
cd5681d7 | 2285 | rcu_assign_pointer(*prog_p, new); |
124da8f6 | 2286 | spin_unlock_bh(&tun->lock); |
96f84061 JW |
2287 | |
2288 | if (old) | |
cd5681d7 | 2289 | call_rcu(&old->rcu, tun_prog_free); |
96f84061 JW |
2290 | |
2291 | return 0; | |
2292 | } | |
2293 | ||
96442e42 JW |
2294 | static void tun_free_netdev(struct net_device *dev) |
2295 | { | |
2296 | struct tun_struct *tun = netdev_priv(dev); | |
2297 | ||
4008e97f | 2298 | BUG_ON(!(list_empty(&tun->disabled))); |
608b9977 | 2299 | free_percpu(tun->pcpu_stats); |
96442e42 | 2300 | tun_flow_uninit(tun); |
5dbbaf2d | 2301 | security_tun_dev_free_security(tun->security); |
cd5681d7 | 2302 | __tun_set_ebpf(tun, &tun->steering_prog, NULL); |
aff3d70a | 2303 | __tun_set_ebpf(tun, &tun->filter_prog, NULL); |
96442e42 JW |
2304 | } |
2305 | ||
1da177e4 LT |
2306 | static void tun_setup(struct net_device *dev) |
2307 | { | |
2308 | struct tun_struct *tun = netdev_priv(dev); | |
2309 | ||
0625c883 EB |
2310 | tun->owner = INVALID_UID; |
2311 | tun->group = INVALID_GID; | |
4e24f2dd | 2312 | tun_default_link_ksettings(dev, &tun->link_ksettings); |
1da177e4 | 2313 | |
1da177e4 | 2314 | dev->ethtool_ops = &tun_ethtool_ops; |
cf124db5 DM |
2315 | dev->needs_free_netdev = true; |
2316 | dev->priv_destructor = tun_free_netdev; | |
016adb72 JW |
2317 | /* We prefer our own queue length */ |
2318 | dev->tx_queue_len = TUN_READQ_SIZE; | |
1da177e4 LT |
2319 | } |
2320 | ||
f019a7a5 EB |
2321 | /* Trivial set of netlink ops to allow deleting tun or tap |
2322 | * device with netlink. | |
2323 | */ | |
a8b8a889 MS |
2324 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[], |
2325 | struct netlink_ext_ack *extack) | |
f019a7a5 EB |
2326 | { |
2327 | return -EINVAL; | |
2328 | } | |
2329 | ||
1ec010e7 SD |
2330 | static size_t tun_get_size(const struct net_device *dev) |
2331 | { | |
2332 | BUILD_BUG_ON(sizeof(u32) != sizeof(uid_t)); | |
2333 | BUILD_BUG_ON(sizeof(u32) != sizeof(gid_t)); | |
2334 | ||
2335 | return nla_total_size(sizeof(uid_t)) + /* OWNER */ | |
2336 | nla_total_size(sizeof(gid_t)) + /* GROUP */ | |
2337 | nla_total_size(sizeof(u8)) + /* TYPE */ | |
2338 | nla_total_size(sizeof(u8)) + /* PI */ | |
2339 | nla_total_size(sizeof(u8)) + /* VNET_HDR */ | |
2340 | nla_total_size(sizeof(u8)) + /* PERSIST */ | |
2341 | nla_total_size(sizeof(u8)) + /* MULTI_QUEUE */ | |
2342 | nla_total_size(sizeof(u32)) + /* NUM_QUEUES */ | |
2343 | nla_total_size(sizeof(u32)) + /* NUM_DISABLED_QUEUES */ | |
2344 | 0; | |
2345 | } | |
2346 | ||
2347 | static int tun_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
2348 | { | |
2349 | struct tun_struct *tun = netdev_priv(dev); | |
2350 | ||
2351 | if (nla_put_u8(skb, IFLA_TUN_TYPE, tun->flags & TUN_TYPE_MASK)) | |
2352 | goto nla_put_failure; | |
2353 | if (uid_valid(tun->owner) && | |
2354 | nla_put_u32(skb, IFLA_TUN_OWNER, | |
2355 | from_kuid_munged(current_user_ns(), tun->owner))) | |
2356 | goto nla_put_failure; | |
2357 | if (gid_valid(tun->group) && | |
2358 | nla_put_u32(skb, IFLA_TUN_GROUP, | |
2359 | from_kgid_munged(current_user_ns(), tun->group))) | |
2360 | goto nla_put_failure; | |
2361 | if (nla_put_u8(skb, IFLA_TUN_PI, !(tun->flags & IFF_NO_PI))) | |
2362 | goto nla_put_failure; | |
2363 | if (nla_put_u8(skb, IFLA_TUN_VNET_HDR, !!(tun->flags & IFF_VNET_HDR))) | |
2364 | goto nla_put_failure; | |
2365 | if (nla_put_u8(skb, IFLA_TUN_PERSIST, !!(tun->flags & IFF_PERSIST))) | |
2366 | goto nla_put_failure; | |
2367 | if (nla_put_u8(skb, IFLA_TUN_MULTI_QUEUE, | |
2368 | !!(tun->flags & IFF_MULTI_QUEUE))) | |
2369 | goto nla_put_failure; | |
2370 | if (tun->flags & IFF_MULTI_QUEUE) { | |
2371 | if (nla_put_u32(skb, IFLA_TUN_NUM_QUEUES, tun->numqueues)) | |
2372 | goto nla_put_failure; | |
2373 | if (nla_put_u32(skb, IFLA_TUN_NUM_DISABLED_QUEUES, | |
2374 | tun->numdisabled)) | |
2375 | goto nla_put_failure; | |
2376 | } | |
2377 | ||
2378 | return 0; | |
2379 | ||
2380 | nla_put_failure: | |
2381 | return -EMSGSIZE; | |
2382 | } | |
2383 | ||
f019a7a5 EB |
2384 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
2385 | .kind = DRV_NAME, | |
2386 | .priv_size = sizeof(struct tun_struct), | |
2387 | .setup = tun_setup, | |
2388 | .validate = tun_validate, | |
1ec010e7 SD |
2389 | .get_size = tun_get_size, |
2390 | .fill_info = tun_fill_info, | |
f019a7a5 EB |
2391 | }; |
2392 | ||
33dccbb0 HX |
2393 | static void tun_sock_write_space(struct sock *sk) |
2394 | { | |
54f968d6 | 2395 | struct tun_file *tfile; |
43815482 | 2396 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
2397 | |
2398 | if (!sock_writeable(sk)) | |
2399 | return; | |
2400 | ||
9cd3e072 | 2401 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
33dccbb0 HX |
2402 | return; |
2403 | ||
43815482 ED |
2404 | wqueue = sk_sleep(sk); |
2405 | if (wqueue && waitqueue_active(wqueue)) | |
a9a08845 LT |
2406 | wake_up_interruptible_sync_poll(wqueue, EPOLLOUT | |
2407 | EPOLLWRNORM | EPOLLWRBAND); | |
c722c625 | 2408 | |
54f968d6 JW |
2409 | tfile = container_of(sk, struct tun_file, sk); |
2410 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
2411 | } |
2412 | ||
1b784140 | 2413 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 2414 | { |
54f968d6 JW |
2415 | int ret; |
2416 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
9484dc74 | 2417 | struct tun_struct *tun = tun_get(tfile); |
54f968d6 JW |
2418 | |
2419 | if (!tun) | |
2420 | return -EBADFD; | |
f5ff53b4 | 2421 | |
c0371da6 | 2422 | ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, |
5503fcec JW |
2423 | m->msg_flags & MSG_DONTWAIT, |
2424 | m->msg_flags & MSG_MORE); | |
54f968d6 JW |
2425 | tun_put(tun); |
2426 | return ret; | |
05c2828c MT |
2427 | } |
2428 | ||
1b784140 | 2429 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
2430 | int flags) |
2431 | { | |
54f968d6 | 2432 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
9484dc74 | 2433 | struct tun_struct *tun = tun_get(tfile); |
fc72d1d5 | 2434 | void *ptr = m->msg_control; |
05c2828c | 2435 | int ret; |
54f968d6 | 2436 | |
c33ee15b WX |
2437 | if (!tun) { |
2438 | ret = -EBADFD; | |
fc72d1d5 | 2439 | goto out_free; |
c33ee15b | 2440 | } |
54f968d6 | 2441 | |
eda29772 | 2442 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 | 2443 | ret = -EINVAL; |
c33ee15b | 2444 | goto out_put_tun; |
3811ae76 | 2445 | } |
eda29772 RC |
2446 | if (flags & MSG_ERRQUEUE) { |
2447 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
2448 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
2449 | goto out; | |
2450 | } | |
fc72d1d5 | 2451 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, ptr); |
87897931 | 2452 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
2453 | m->msg_flags |= MSG_TRUNC; |
2454 | ret = flags & MSG_TRUNC ? ret : total_len; | |
2455 | } | |
3811ae76 | 2456 | out: |
54f968d6 | 2457 | tun_put(tun); |
05c2828c | 2458 | return ret; |
c33ee15b WX |
2459 | |
2460 | out_put_tun: | |
2461 | tun_put(tun); | |
fc72d1d5 JW |
2462 | out_free: |
2463 | tun_ptr_free(ptr); | |
c33ee15b | 2464 | return ret; |
05c2828c MT |
2465 | } |
2466 | ||
fc72d1d5 JW |
2467 | static int tun_ptr_peek_len(void *ptr) |
2468 | { | |
2469 | if (likely(ptr)) { | |
1ffcbc85 JDB |
2470 | if (tun_is_xdp_frame(ptr)) { |
2471 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2472 | |
1ffcbc85 | 2473 | return xdpf->len; |
fc72d1d5 JW |
2474 | } |
2475 | return __skb_array_len_with_tag(ptr); | |
2476 | } else { | |
2477 | return 0; | |
2478 | } | |
2479 | } | |
2480 | ||
1576d986 JW |
2481 | static int tun_peek_len(struct socket *sock) |
2482 | { | |
2483 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
2484 | struct tun_struct *tun; | |
2485 | int ret = 0; | |
2486 | ||
9484dc74 | 2487 | tun = tun_get(tfile); |
1576d986 JW |
2488 | if (!tun) |
2489 | return 0; | |
2490 | ||
fc72d1d5 | 2491 | ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, tun_ptr_peek_len); |
1576d986 JW |
2492 | tun_put(tun); |
2493 | ||
2494 | return ret; | |
2495 | } | |
2496 | ||
05c2828c MT |
2497 | /* Ops structure to mimic raw sockets with tun */ |
2498 | static const struct proto_ops tun_socket_ops = { | |
1576d986 | 2499 | .peek_len = tun_peek_len, |
05c2828c MT |
2500 | .sendmsg = tun_sendmsg, |
2501 | .recvmsg = tun_recvmsg, | |
2502 | }; | |
2503 | ||
33dccbb0 HX |
2504 | static struct proto tun_proto = { |
2505 | .name = "tun", | |
2506 | .owner = THIS_MODULE, | |
54f968d6 | 2507 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 2508 | }; |
f019a7a5 | 2509 | |
980c9e8c DW |
2510 | static int tun_flags(struct tun_struct *tun) |
2511 | { | |
031f5e03 | 2512 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
2513 | } |
2514 | ||
2515 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
2516 | char *buf) | |
2517 | { | |
2518 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
2519 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
2520 | } | |
2521 | ||
2522 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
2523 | char *buf) | |
2524 | { | |
2525 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
2526 | return uid_valid(tun->owner)? |
2527 | sprintf(buf, "%u\n", | |
2528 | from_kuid_munged(current_user_ns(), tun->owner)): | |
2529 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
2530 | } |
2531 | ||
2532 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
2533 | char *buf) | |
2534 | { | |
2535 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
2536 | return gid_valid(tun->group) ? |
2537 | sprintf(buf, "%u\n", | |
2538 | from_kgid_munged(current_user_ns(), tun->group)): | |
2539 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
2540 | } |
2541 | ||
2542 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
2543 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
2544 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
2545 | ||
c4d33e24 TI |
2546 | static struct attribute *tun_dev_attrs[] = { |
2547 | &dev_attr_tun_flags.attr, | |
2548 | &dev_attr_owner.attr, | |
2549 | &dev_attr_group.attr, | |
2550 | NULL | |
2551 | }; | |
2552 | ||
2553 | static const struct attribute_group tun_attr_group = { | |
2554 | .attrs = tun_dev_attrs | |
2555 | }; | |
2556 | ||
d647a591 | 2557 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
2558 | { |
2559 | struct tun_struct *tun; | |
54f968d6 | 2560 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2561 | struct net_device *dev; |
2562 | int err; | |
2563 | ||
7c0c3b1a JW |
2564 | if (tfile->detached) |
2565 | return -EINVAL; | |
2566 | ||
90e33d45 PP |
2567 | if ((ifr->ifr_flags & IFF_NAPI_FRAGS)) { |
2568 | if (!capable(CAP_NET_ADMIN)) | |
2569 | return -EPERM; | |
2570 | ||
2571 | if (!(ifr->ifr_flags & IFF_NAPI) || | |
2572 | (ifr->ifr_flags & TUN_TYPE_MASK) != IFF_TAP) | |
2573 | return -EINVAL; | |
2574 | } | |
2575 | ||
74a3e5a7 EB |
2576 | dev = __dev_get_by_name(net, ifr->ifr_name); |
2577 | if (dev) { | |
f85ba780 DW |
2578 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
2579 | return -EBUSY; | |
74a3e5a7 EB |
2580 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
2581 | tun = netdev_priv(dev); | |
2582 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
2583 | tun = netdev_priv(dev); | |
2584 | else | |
2585 | return -EINVAL; | |
2586 | ||
8e6d91ae | 2587 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 2588 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
2589 | return -EINVAL; |
2590 | ||
cde8b15f | 2591 | if (tun_not_capable(tun)) |
2b980dbd | 2592 | return -EPERM; |
5dbbaf2d | 2593 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
2594 | if (err < 0) |
2595 | return err; | |
2596 | ||
94317099 PP |
2597 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER, |
2598 | ifr->ifr_flags & IFF_NAPI); | |
a7385ba2 EB |
2599 | if (err < 0) |
2600 | return err; | |
4008e97f | 2601 | |
40630b82 | 2602 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
2603 | (tun->numqueues + tun->numdisabled > 1)) { |
2604 | /* One or more queue has already been attached, no need | |
2605 | * to initialize the device again. | |
2606 | */ | |
83c1f36f | 2607 | netdev_state_change(dev); |
e8dbad66 JW |
2608 | return 0; |
2609 | } | |
9fffc5c6 SD |
2610 | |
2611 | tun->flags = (tun->flags & ~TUN_FEATURES) | | |
2612 | (ifr->ifr_flags & TUN_FEATURES); | |
83c1f36f SD |
2613 | |
2614 | netdev_state_change(dev); | |
2615 | } else { | |
1da177e4 LT |
2616 | char *name; |
2617 | unsigned long flags = 0; | |
edfb6a14 JW |
2618 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
2619 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 2620 | |
c260b772 | 2621 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 2622 | return -EPERM; |
2b980dbd PM |
2623 | err = security_tun_dev_create(); |
2624 | if (err < 0) | |
2625 | return err; | |
ca6bb5d7 | 2626 | |
1da177e4 LT |
2627 | /* Set dev type */ |
2628 | if (ifr->ifr_flags & IFF_TUN) { | |
2629 | /* TUN device */ | |
40630b82 | 2630 | flags |= IFF_TUN; |
1da177e4 LT |
2631 | name = "tun%d"; |
2632 | } else if (ifr->ifr_flags & IFF_TAP) { | |
2633 | /* TAP device */ | |
40630b82 | 2634 | flags |= IFF_TAP; |
1da177e4 | 2635 | name = "tap%d"; |
6aa20a22 | 2636 | } else |
36989b90 | 2637 | return -EINVAL; |
6aa20a22 | 2638 | |
1da177e4 LT |
2639 | if (*ifr->ifr_name) |
2640 | name = ifr->ifr_name; | |
2641 | ||
c8d68e6b | 2642 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
2643 | NET_NAME_UNKNOWN, tun_setup, queues, |
2644 | queues); | |
edfb6a14 | 2645 | |
1da177e4 LT |
2646 | if (!dev) |
2647 | return -ENOMEM; | |
0ad646c8 | 2648 | err = dev_get_valid_name(net, dev, name); |
5c25f65f | 2649 | if (err < 0) |
0ad646c8 | 2650 | goto err_free_dev; |
1da177e4 | 2651 | |
fc54c658 | 2652 | dev_net_set(dev, net); |
f019a7a5 | 2653 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 2654 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 2655 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 2656 | |
1da177e4 LT |
2657 | tun = netdev_priv(dev); |
2658 | tun->dev = dev; | |
2659 | tun->flags = flags; | |
f271b2cc | 2660 | tun->txflt.count = 0; |
d9d52b51 | 2661 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 2662 | |
eaea34b2 | 2663 | tun->align = NET_SKB_PAD; |
54f968d6 JW |
2664 | tun->filter_attached = false; |
2665 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
5503fcec | 2666 | tun->rx_batched = 0; |
96f84061 | 2667 | RCU_INIT_POINTER(tun->steering_prog, NULL); |
33dccbb0 | 2668 | |
608b9977 PA |
2669 | tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); |
2670 | if (!tun->pcpu_stats) { | |
2671 | err = -ENOMEM; | |
2672 | goto err_free_dev; | |
2673 | } | |
2674 | ||
96442e42 JW |
2675 | spin_lock_init(&tun->lock); |
2676 | ||
5dbbaf2d PM |
2677 | err = security_tun_dev_alloc_security(&tun->security); |
2678 | if (err < 0) | |
608b9977 | 2679 | goto err_free_stat; |
2b980dbd | 2680 | |
1da177e4 | 2681 | tun_net_init(dev); |
944a1376 | 2682 | tun_flow_init(tun); |
96442e42 | 2683 | |
88255375 | 2684 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
2685 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
2686 | NETIF_F_HW_VLAN_STAG_TX; | |
2a2bbf17 | 2687 | dev->features = dev->hw_features | NETIF_F_LLTX; |
6671b224 FLVC |
2688 | dev->vlan_features = dev->features & |
2689 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
2690 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 2691 | |
9fffc5c6 SD |
2692 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
2693 | (ifr->ifr_flags & TUN_FEATURES); | |
2694 | ||
4008e97f | 2695 | INIT_LIST_HEAD(&tun->disabled); |
94317099 | 2696 | err = tun_attach(tun, file, false, ifr->ifr_flags & IFF_NAPI); |
eb0fb363 | 2697 | if (err < 0) |
662ca437 | 2698 | goto err_free_flow; |
eb0fb363 | 2699 | |
1da177e4 LT |
2700 | err = register_netdevice(tun->dev); |
2701 | if (err < 0) | |
662ca437 | 2702 | goto err_detach; |
1da177e4 LT |
2703 | } |
2704 | ||
af668b3c MT |
2705 | netif_carrier_on(tun->dev); |
2706 | ||
6b8a66ee | 2707 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 2708 | |
e35259a9 MK |
2709 | /* Make sure persistent devices do not get stuck in |
2710 | * xoff state. | |
2711 | */ | |
2712 | if (netif_running(tun->dev)) | |
c8d68e6b | 2713 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 2714 | |
1da177e4 LT |
2715 | strcpy(ifr->ifr_name, tun->dev->name); |
2716 | return 0; | |
2717 | ||
662ca437 JW |
2718 | err_detach: |
2719 | tun_detach_all(dev); | |
ff244c6b ED |
2720 | /* register_netdevice() already called tun_free_netdev() */ |
2721 | goto err_free_dev; | |
2722 | ||
662ca437 JW |
2723 | err_free_flow: |
2724 | tun_flow_uninit(tun); | |
2725 | security_tun_dev_free_security(tun->security); | |
608b9977 PA |
2726 | err_free_stat: |
2727 | free_percpu(tun->pcpu_stats); | |
662ca437 | 2728 | err_free_dev: |
1da177e4 | 2729 | free_netdev(dev); |
1da177e4 LT |
2730 | return err; |
2731 | } | |
2732 | ||
9ce99cf6 | 2733 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 2734 | struct ifreq *ifr) |
e3b99556 | 2735 | { |
6b8a66ee | 2736 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
2737 | |
2738 | strcpy(ifr->ifr_name, tun->dev->name); | |
2739 | ||
980c9e8c | 2740 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 2741 | |
e3b99556 MM |
2742 | } |
2743 | ||
5228ddc9 RR |
2744 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
2745 | * privs required. */ | |
88255375 | 2746 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 2747 | { |
c8f44aff | 2748 | netdev_features_t features = 0; |
5228ddc9 RR |
2749 | |
2750 | if (arg & TUN_F_CSUM) { | |
88255375 | 2751 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
2752 | arg &= ~TUN_F_CSUM; |
2753 | ||
2754 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
2755 | if (arg & TUN_F_TSO_ECN) { | |
2756 | features |= NETIF_F_TSO_ECN; | |
2757 | arg &= ~TUN_F_TSO_ECN; | |
2758 | } | |
2759 | if (arg & TUN_F_TSO4) | |
2760 | features |= NETIF_F_TSO; | |
2761 | if (arg & TUN_F_TSO6) | |
2762 | features |= NETIF_F_TSO6; | |
2763 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
2764 | } | |
0c19f846 WB |
2765 | |
2766 | arg &= ~TUN_F_UFO; | |
5228ddc9 RR |
2767 | } |
2768 | ||
2769 | /* This gives the user a way to test for new features in future by | |
2770 | * trying to set them. */ | |
2771 | if (arg) | |
2772 | return -EINVAL; | |
2773 | ||
88255375 | 2774 | tun->set_features = features; |
09050957 YI |
2775 | tun->dev->wanted_features &= ~TUN_USER_FEATURES; |
2776 | tun->dev->wanted_features |= features; | |
88255375 | 2777 | netdev_update_features(tun->dev); |
5228ddc9 RR |
2778 | |
2779 | return 0; | |
2780 | } | |
2781 | ||
c8d68e6b JW |
2782 | static void tun_detach_filter(struct tun_struct *tun, int n) |
2783 | { | |
2784 | int i; | |
2785 | struct tun_file *tfile; | |
2786 | ||
2787 | for (i = 0; i < n; i++) { | |
b8deabd3 | 2788 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2789 | lock_sock(tfile->socket.sk); |
2790 | sk_detach_filter(tfile->socket.sk); | |
2791 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2792 | } |
2793 | ||
2794 | tun->filter_attached = false; | |
2795 | } | |
2796 | ||
2797 | static int tun_attach_filter(struct tun_struct *tun) | |
2798 | { | |
2799 | int i, ret = 0; | |
2800 | struct tun_file *tfile; | |
2801 | ||
2802 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2803 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2804 | lock_sock(tfile->socket.sk); |
2805 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
2806 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2807 | if (ret) { |
2808 | tun_detach_filter(tun, i); | |
2809 | return ret; | |
2810 | } | |
2811 | } | |
2812 | ||
2813 | tun->filter_attached = true; | |
2814 | return ret; | |
2815 | } | |
2816 | ||
2817 | static void tun_set_sndbuf(struct tun_struct *tun) | |
2818 | { | |
2819 | struct tun_file *tfile; | |
2820 | int i; | |
2821 | ||
2822 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2823 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
2824 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
2825 | } | |
2826 | } | |
2827 | ||
cde8b15f JW |
2828 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
2829 | { | |
2830 | struct tun_file *tfile = file->private_data; | |
2831 | struct tun_struct *tun; | |
cde8b15f JW |
2832 | int ret = 0; |
2833 | ||
2834 | rtnl_lock(); | |
2835 | ||
2836 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 2837 | tun = tfile->detached; |
5dbbaf2d | 2838 | if (!tun) { |
cde8b15f | 2839 | ret = -EINVAL; |
5dbbaf2d PM |
2840 | goto unlock; |
2841 | } | |
2842 | ret = security_tun_dev_attach_queue(tun->security); | |
2843 | if (ret < 0) | |
2844 | goto unlock; | |
94317099 | 2845 | ret = tun_attach(tun, file, false, tun->flags & IFF_NAPI); |
4008e97f | 2846 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 2847 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 2848 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
2849 | ret = -EINVAL; |
2850 | else | |
2851 | __tun_detach(tfile, false); | |
2852 | } else | |
cde8b15f JW |
2853 | ret = -EINVAL; |
2854 | ||
83c1f36f SD |
2855 | if (ret >= 0) |
2856 | netdev_state_change(tun->dev); | |
2857 | ||
5dbbaf2d | 2858 | unlock: |
cde8b15f JW |
2859 | rtnl_unlock(); |
2860 | return ret; | |
2861 | } | |
2862 | ||
cd5681d7 JW |
2863 | static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog **prog_p, |
2864 | void __user *data) | |
96f84061 JW |
2865 | { |
2866 | struct bpf_prog *prog; | |
2867 | int fd; | |
2868 | ||
2869 | if (copy_from_user(&fd, data, sizeof(fd))) | |
2870 | return -EFAULT; | |
2871 | ||
2872 | if (fd == -1) { | |
2873 | prog = NULL; | |
2874 | } else { | |
2875 | prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); | |
2876 | if (IS_ERR(prog)) | |
2877 | return PTR_ERR(prog); | |
2878 | } | |
2879 | ||
cd5681d7 | 2880 | return __tun_set_ebpf(tun, prog_p, prog); |
96f84061 JW |
2881 | } |
2882 | ||
50857e2a AB |
2883 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
2884 | unsigned long arg, int ifreq_len) | |
1da177e4 | 2885 | { |
36b50bab | 2886 | struct tun_file *tfile = file->private_data; |
f663706a | 2887 | struct net *net = sock_net(&tfile->sk); |
631ab46b | 2888 | struct tun_struct *tun; |
1da177e4 LT |
2889 | void __user* argp = (void __user*)arg; |
2890 | struct ifreq ifr; | |
0625c883 EB |
2891 | kuid_t owner; |
2892 | kgid_t group; | |
33dccbb0 | 2893 | int sndbuf; |
d9d52b51 | 2894 | int vnet_hdr_sz; |
fb7589a1 | 2895 | unsigned int ifindex; |
1cf8e410 | 2896 | int le; |
f271b2cc | 2897 | int ret; |
83c1f36f | 2898 | bool do_notify = false; |
1da177e4 | 2899 | |
f2780d6d KT |
2900 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || |
2901 | (_IOC_TYPE(cmd) == SOCK_IOC_TYPE && cmd != SIOCGSKNS)) { | |
50857e2a | 2902 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 2903 | return -EFAULT; |
8bbb1813 | 2904 | } else { |
a117dacd | 2905 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 2906 | } |
631ab46b EB |
2907 | if (cmd == TUNGETFEATURES) { |
2908 | /* Currently this just means: "what IFF flags are valid?". | |
2909 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
2910 | * TUNSETIFF. |
2911 | */ | |
2912 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 2913 | (unsigned int __user*)argp); |
f663706a | 2914 | } else if (cmd == TUNSETQUEUE) { |
cde8b15f | 2915 | return tun_set_queue(file, &ifr); |
f663706a KT |
2916 | } else if (cmd == SIOCGSKNS) { |
2917 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
2918 | return -EPERM; | |
2919 | return open_related_ns(&net->ns, get_net_ns); | |
2920 | } | |
631ab46b | 2921 | |
c8d68e6b | 2922 | ret = 0; |
876bfd4d HX |
2923 | rtnl_lock(); |
2924 | ||
9484dc74 | 2925 | tun = tun_get(tfile); |
0f16bc13 GF |
2926 | if (cmd == TUNSETIFF) { |
2927 | ret = -EEXIST; | |
2928 | if (tun) | |
2929 | goto unlock; | |
2930 | ||
1da177e4 LT |
2931 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
2932 | ||
f2780d6d | 2933 | ret = tun_set_iff(net, file, &ifr); |
1da177e4 | 2934 | |
876bfd4d HX |
2935 | if (ret) |
2936 | goto unlock; | |
1da177e4 | 2937 | |
50857e2a | 2938 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
2939 | ret = -EFAULT; |
2940 | goto unlock; | |
1da177e4 | 2941 | } |
fb7589a1 PE |
2942 | if (cmd == TUNSETIFINDEX) { |
2943 | ret = -EPERM; | |
2944 | if (tun) | |
2945 | goto unlock; | |
2946 | ||
2947 | ret = -EFAULT; | |
2948 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
2949 | goto unlock; | |
2950 | ||
2951 | ret = 0; | |
2952 | tfile->ifindex = ifindex; | |
2953 | goto unlock; | |
2954 | } | |
1da177e4 | 2955 | |
876bfd4d | 2956 | ret = -EBADFD; |
1da177e4 | 2957 | if (!tun) |
876bfd4d | 2958 | goto unlock; |
1da177e4 | 2959 | |
1e588338 | 2960 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 2961 | |
631ab46b | 2962 | ret = 0; |
1da177e4 | 2963 | switch (cmd) { |
e3b99556 | 2964 | case TUNGETIFF: |
9ce99cf6 | 2965 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 2966 | |
3d407a80 PE |
2967 | if (tfile->detached) |
2968 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
2969 | if (!tfile->socket.sk->sk_filter) |
2970 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 2971 | |
50857e2a | 2972 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 2973 | ret = -EFAULT; |
e3b99556 MM |
2974 | break; |
2975 | ||
1da177e4 LT |
2976 | case TUNSETNOCSUM: |
2977 | /* Disable/Enable checksum */ | |
1da177e4 | 2978 | |
88255375 MM |
2979 | /* [unimplemented] */ |
2980 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 2981 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
2982 | break; |
2983 | ||
2984 | case TUNSETPERSIST: | |
54f968d6 JW |
2985 | /* Disable/Enable persist mode. Keep an extra reference to the |
2986 | * module to prevent the module being unprobed. | |
2987 | */ | |
40630b82 MT |
2988 | if (arg && !(tun->flags & IFF_PERSIST)) { |
2989 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 2990 | __module_get(THIS_MODULE); |
83c1f36f | 2991 | do_notify = true; |
dd38bd85 | 2992 | } |
40630b82 MT |
2993 | if (!arg && (tun->flags & IFF_PERSIST)) { |
2994 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 | 2995 | module_put(THIS_MODULE); |
83c1f36f | 2996 | do_notify = true; |
54f968d6 | 2997 | } |
1da177e4 | 2998 | |
6b8a66ee JP |
2999 | tun_debug(KERN_INFO, tun, "persist %s\n", |
3000 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
3001 | break; |
3002 | ||
3003 | case TUNSETOWNER: | |
3004 | /* Set owner of the device */ | |
0625c883 EB |
3005 | owner = make_kuid(current_user_ns(), arg); |
3006 | if (!uid_valid(owner)) { | |
3007 | ret = -EINVAL; | |
3008 | break; | |
3009 | } | |
3010 | tun->owner = owner; | |
83c1f36f | 3011 | do_notify = true; |
1e588338 | 3012 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 3013 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
3014 | break; |
3015 | ||
8c644623 GG |
3016 | case TUNSETGROUP: |
3017 | /* Set group of the device */ | |
0625c883 EB |
3018 | group = make_kgid(current_user_ns(), arg); |
3019 | if (!gid_valid(group)) { | |
3020 | ret = -EINVAL; | |
3021 | break; | |
3022 | } | |
3023 | tun->group = group; | |
83c1f36f | 3024 | do_notify = true; |
1e588338 | 3025 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 3026 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
3027 | break; |
3028 | ||
ff4cc3ac MK |
3029 | case TUNSETLINK: |
3030 | /* Only allow setting the type when the interface is down */ | |
3031 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
3032 | tun_debug(KERN_INFO, tun, |
3033 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 3034 | ret = -EBUSY; |
ff4cc3ac MK |
3035 | } else { |
3036 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
3037 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
3038 | tun->dev->type); | |
48abfe05 | 3039 | ret = 0; |
ff4cc3ac | 3040 | } |
631ab46b | 3041 | break; |
ff4cc3ac | 3042 | |
1da177e4 LT |
3043 | #ifdef TUN_DEBUG |
3044 | case TUNSETDEBUG: | |
3045 | tun->debug = arg; | |
3046 | break; | |
3047 | #endif | |
5228ddc9 | 3048 | case TUNSETOFFLOAD: |
88255375 | 3049 | ret = set_offload(tun, arg); |
631ab46b | 3050 | break; |
5228ddc9 | 3051 | |
f271b2cc MK |
3052 | case TUNSETTXFILTER: |
3053 | /* Can be set only for TAPs */ | |
631ab46b | 3054 | ret = -EINVAL; |
40630b82 | 3055 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 3056 | break; |
c0e5a8c2 | 3057 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 3058 | break; |
1da177e4 LT |
3059 | |
3060 | case SIOCGIFHWADDR: | |
b595076a | 3061 | /* Get hw address */ |
f271b2cc MK |
3062 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
3063 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 3064 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
3065 | ret = -EFAULT; |
3066 | break; | |
1da177e4 LT |
3067 | |
3068 | case SIOCSIFHWADDR: | |
f271b2cc | 3069 | /* Set hw address */ |
6b8a66ee JP |
3070 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
3071 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 3072 | |
40102371 | 3073 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 3074 | break; |
33dccbb0 HX |
3075 | |
3076 | case TUNGETSNDBUF: | |
54f968d6 | 3077 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
3078 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
3079 | ret = -EFAULT; | |
3080 | break; | |
3081 | ||
3082 | case TUNSETSNDBUF: | |
3083 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
3084 | ret = -EFAULT; | |
3085 | break; | |
3086 | } | |
93161922 CG |
3087 | if (sndbuf <= 0) { |
3088 | ret = -EINVAL; | |
3089 | break; | |
3090 | } | |
33dccbb0 | 3091 | |
c8d68e6b JW |
3092 | tun->sndbuf = sndbuf; |
3093 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
3094 | break; |
3095 | ||
d9d52b51 MT |
3096 | case TUNGETVNETHDRSZ: |
3097 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
3098 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
3099 | ret = -EFAULT; | |
3100 | break; | |
3101 | ||
3102 | case TUNSETVNETHDRSZ: | |
3103 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
3104 | ret = -EFAULT; | |
3105 | break; | |
3106 | } | |
3107 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
3108 | ret = -EINVAL; | |
3109 | break; | |
3110 | } | |
3111 | ||
3112 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
3113 | break; | |
3114 | ||
1cf8e410 MT |
3115 | case TUNGETVNETLE: |
3116 | le = !!(tun->flags & TUN_VNET_LE); | |
3117 | if (put_user(le, (int __user *)argp)) | |
3118 | ret = -EFAULT; | |
3119 | break; | |
3120 | ||
3121 | case TUNSETVNETLE: | |
3122 | if (get_user(le, (int __user *)argp)) { | |
3123 | ret = -EFAULT; | |
3124 | break; | |
3125 | } | |
3126 | if (le) | |
3127 | tun->flags |= TUN_VNET_LE; | |
3128 | else | |
3129 | tun->flags &= ~TUN_VNET_LE; | |
3130 | break; | |
3131 | ||
8b8e658b GK |
3132 | case TUNGETVNETBE: |
3133 | ret = tun_get_vnet_be(tun, argp); | |
3134 | break; | |
3135 | ||
3136 | case TUNSETVNETBE: | |
3137 | ret = tun_set_vnet_be(tun, argp); | |
3138 | break; | |
3139 | ||
99405162 MT |
3140 | case TUNATTACHFILTER: |
3141 | /* Can be set only for TAPs */ | |
3142 | ret = -EINVAL; | |
40630b82 | 3143 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
3144 | break; |
3145 | ret = -EFAULT; | |
54f968d6 | 3146 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
3147 | break; |
3148 | ||
c8d68e6b | 3149 | ret = tun_attach_filter(tun); |
99405162 MT |
3150 | break; |
3151 | ||
3152 | case TUNDETACHFILTER: | |
3153 | /* Can be set only for TAPs */ | |
3154 | ret = -EINVAL; | |
40630b82 | 3155 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 3156 | break; |
c8d68e6b JW |
3157 | ret = 0; |
3158 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
3159 | break; |
3160 | ||
76975e9c PE |
3161 | case TUNGETFILTER: |
3162 | ret = -EINVAL; | |
40630b82 | 3163 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
3164 | break; |
3165 | ret = -EFAULT; | |
3166 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
3167 | break; | |
3168 | ret = 0; | |
3169 | break; | |
3170 | ||
96f84061 | 3171 | case TUNSETSTEERINGEBPF: |
cd5681d7 | 3172 | ret = tun_set_ebpf(tun, &tun->steering_prog, argp); |
96f84061 JW |
3173 | break; |
3174 | ||
aff3d70a JW |
3175 | case TUNSETFILTEREBPF: |
3176 | ret = tun_set_ebpf(tun, &tun->filter_prog, argp); | |
3177 | break; | |
3178 | ||
1da177e4 | 3179 | default: |
631ab46b EB |
3180 | ret = -EINVAL; |
3181 | break; | |
ee289b64 | 3182 | } |
1da177e4 | 3183 | |
83c1f36f SD |
3184 | if (do_notify) |
3185 | netdev_state_change(tun->dev); | |
3186 | ||
876bfd4d HX |
3187 | unlock: |
3188 | rtnl_unlock(); | |
3189 | if (tun) | |
3190 | tun_put(tun); | |
631ab46b | 3191 | return ret; |
1da177e4 LT |
3192 | } |
3193 | ||
50857e2a AB |
3194 | static long tun_chr_ioctl(struct file *file, |
3195 | unsigned int cmd, unsigned long arg) | |
3196 | { | |
3197 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
3198 | } | |
3199 | ||
3200 | #ifdef CONFIG_COMPAT | |
3201 | static long tun_chr_compat_ioctl(struct file *file, | |
3202 | unsigned int cmd, unsigned long arg) | |
3203 | { | |
3204 | switch (cmd) { | |
3205 | case TUNSETIFF: | |
3206 | case TUNGETIFF: | |
3207 | case TUNSETTXFILTER: | |
3208 | case TUNGETSNDBUF: | |
3209 | case TUNSETSNDBUF: | |
3210 | case SIOCGIFHWADDR: | |
3211 | case SIOCSIFHWADDR: | |
3212 | arg = (unsigned long)compat_ptr(arg); | |
3213 | break; | |
3214 | default: | |
3215 | arg = (compat_ulong_t)arg; | |
3216 | break; | |
3217 | } | |
3218 | ||
3219 | /* | |
3220 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
3221 | * the end of that structure. All fields that are used in this | |
3222 | * driver are compatible though, we don't need to convert the | |
3223 | * contents. | |
3224 | */ | |
3225 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
3226 | } | |
3227 | #endif /* CONFIG_COMPAT */ | |
3228 | ||
1da177e4 LT |
3229 | static int tun_chr_fasync(int fd, struct file *file, int on) |
3230 | { | |
54f968d6 | 3231 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
3232 | int ret; |
3233 | ||
54f968d6 | 3234 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 3235 | goto out; |
6aa20a22 | 3236 | |
1da177e4 | 3237 | if (on) { |
01919134 | 3238 | __f_setown(file, task_pid(current), PIDTYPE_TGID, 0); |
54f968d6 | 3239 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 3240 | } else |
54f968d6 | 3241 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
3242 | ret = 0; |
3243 | out: | |
9d319522 | 3244 | return ret; |
1da177e4 LT |
3245 | } |
3246 | ||
3247 | static int tun_chr_open(struct inode *inode, struct file * file) | |
3248 | { | |
140e807d | 3249 | struct net *net = current->nsproxy->net_ns; |
631ab46b | 3250 | struct tun_file *tfile; |
deed49fb | 3251 | |
6b8a66ee | 3252 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 3253 | |
140e807d | 3254 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
11aa9c28 | 3255 | &tun_proto, 0); |
631ab46b EB |
3256 | if (!tfile) |
3257 | return -ENOMEM; | |
b196d88a JW |
3258 | if (ptr_ring_init(&tfile->tx_ring, 0, GFP_KERNEL)) { |
3259 | sk_free(&tfile->sk); | |
3260 | return -ENOMEM; | |
3261 | } | |
3262 | ||
c956674b | 3263 | RCU_INIT_POINTER(tfile->tun, NULL); |
54f968d6 | 3264 | tfile->flags = 0; |
fb7589a1 | 3265 | tfile->ifindex = 0; |
54f968d6 | 3266 | |
54f968d6 | 3267 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 3268 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
3269 | |
3270 | tfile->socket.file = file; | |
3271 | tfile->socket.ops = &tun_socket_ops; | |
3272 | ||
3273 | sock_init_data(&tfile->socket, &tfile->sk); | |
54f968d6 JW |
3274 | |
3275 | tfile->sk.sk_write_space = tun_sock_write_space; | |
3276 | tfile->sk.sk_sndbuf = INT_MAX; | |
3277 | ||
631ab46b | 3278 | file->private_data = tfile; |
4008e97f | 3279 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 3280 | |
19a6afb2 JW |
3281 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
3282 | ||
1da177e4 LT |
3283 | return 0; |
3284 | } | |
3285 | ||
3286 | static int tun_chr_close(struct inode *inode, struct file *file) | |
3287 | { | |
631ab46b | 3288 | struct tun_file *tfile = file->private_data; |
1da177e4 | 3289 | |
c8d68e6b | 3290 | tun_detach(tfile, true); |
1da177e4 LT |
3291 | |
3292 | return 0; | |
3293 | } | |
3294 | ||
93e14b6d | 3295 | #ifdef CONFIG_PROC_FS |
9484dc74 | 3296 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *file) |
93e14b6d | 3297 | { |
9484dc74 | 3298 | struct tun_file *tfile = file->private_data; |
93e14b6d MY |
3299 | struct tun_struct *tun; |
3300 | struct ifreq ifr; | |
3301 | ||
3302 | memset(&ifr, 0, sizeof(ifr)); | |
3303 | ||
3304 | rtnl_lock(); | |
9484dc74 | 3305 | tun = tun_get(tfile); |
93e14b6d MY |
3306 | if (tun) |
3307 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
3308 | rtnl_unlock(); | |
3309 | ||
3310 | if (tun) | |
3311 | tun_put(tun); | |
3312 | ||
a3816ab0 | 3313 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
3314 | } |
3315 | #endif | |
3316 | ||
d54b1fdb | 3317 | static const struct file_operations tun_fops = { |
6aa20a22 | 3318 | .owner = THIS_MODULE, |
1da177e4 | 3319 | .llseek = no_llseek, |
9b067034 | 3320 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 3321 | .write_iter = tun_chr_write_iter, |
1da177e4 | 3322 | .poll = tun_chr_poll, |
50857e2a AB |
3323 | .unlocked_ioctl = tun_chr_ioctl, |
3324 | #ifdef CONFIG_COMPAT | |
3325 | .compat_ioctl = tun_chr_compat_ioctl, | |
3326 | #endif | |
1da177e4 LT |
3327 | .open = tun_chr_open, |
3328 | .release = tun_chr_close, | |
93e14b6d MY |
3329 | .fasync = tun_chr_fasync, |
3330 | #ifdef CONFIG_PROC_FS | |
3331 | .show_fdinfo = tun_chr_show_fdinfo, | |
3332 | #endif | |
1da177e4 LT |
3333 | }; |
3334 | ||
3335 | static struct miscdevice tun_miscdev = { | |
3336 | .minor = TUN_MINOR, | |
3337 | .name = "tun", | |
e454cea2 | 3338 | .nodename = "net/tun", |
1da177e4 | 3339 | .fops = &tun_fops, |
1da177e4 LT |
3340 | }; |
3341 | ||
3342 | /* ethtool interface */ | |
3343 | ||
4e24f2dd CW |
3344 | static void tun_default_link_ksettings(struct net_device *dev, |
3345 | struct ethtool_link_ksettings *cmd) | |
29ccc49d PR |
3346 | { |
3347 | ethtool_link_ksettings_zero_link_mode(cmd, supported); | |
3348 | ethtool_link_ksettings_zero_link_mode(cmd, advertising); | |
3349 | cmd->base.speed = SPEED_10; | |
3350 | cmd->base.duplex = DUPLEX_FULL; | |
3351 | cmd->base.port = PORT_TP; | |
3352 | cmd->base.phy_address = 0; | |
3353 | cmd->base.autoneg = AUTONEG_DISABLE; | |
4e24f2dd CW |
3354 | } |
3355 | ||
3356 | static int tun_get_link_ksettings(struct net_device *dev, | |
3357 | struct ethtool_link_ksettings *cmd) | |
3358 | { | |
3359 | struct tun_struct *tun = netdev_priv(dev); | |
3360 | ||
3361 | memcpy(cmd, &tun->link_ksettings, sizeof(*cmd)); | |
3362 | return 0; | |
3363 | } | |
3364 | ||
3365 | static int tun_set_link_ksettings(struct net_device *dev, | |
3366 | const struct ethtool_link_ksettings *cmd) | |
3367 | { | |
3368 | struct tun_struct *tun = netdev_priv(dev); | |
3369 | ||
3370 | memcpy(&tun->link_ksettings, cmd, sizeof(*cmd)); | |
1da177e4 LT |
3371 | return 0; |
3372 | } | |
3373 | ||
3374 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
3375 | { | |
3376 | struct tun_struct *tun = netdev_priv(dev); | |
3377 | ||
33a5ba14 RJ |
3378 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
3379 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
3380 | |
3381 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 3382 | case IFF_TUN: |
33a5ba14 | 3383 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 3384 | break; |
40630b82 | 3385 | case IFF_TAP: |
33a5ba14 | 3386 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
3387 | break; |
3388 | } | |
3389 | } | |
3390 | ||
3391 | static u32 tun_get_msglevel(struct net_device *dev) | |
3392 | { | |
3393 | #ifdef TUN_DEBUG | |
3394 | struct tun_struct *tun = netdev_priv(dev); | |
3395 | return tun->debug; | |
3396 | #else | |
3397 | return -EOPNOTSUPP; | |
3398 | #endif | |
3399 | } | |
3400 | ||
3401 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
3402 | { | |
3403 | #ifdef TUN_DEBUG | |
3404 | struct tun_struct *tun = netdev_priv(dev); | |
3405 | tun->debug = value; | |
3406 | #endif | |
3407 | } | |
3408 | ||
5503fcec JW |
3409 | static int tun_get_coalesce(struct net_device *dev, |
3410 | struct ethtool_coalesce *ec) | |
3411 | { | |
3412 | struct tun_struct *tun = netdev_priv(dev); | |
3413 | ||
3414 | ec->rx_max_coalesced_frames = tun->rx_batched; | |
3415 | ||
3416 | return 0; | |
3417 | } | |
3418 | ||
3419 | static int tun_set_coalesce(struct net_device *dev, | |
3420 | struct ethtool_coalesce *ec) | |
3421 | { | |
3422 | struct tun_struct *tun = netdev_priv(dev); | |
3423 | ||
3424 | if (ec->rx_max_coalesced_frames > NAPI_POLL_WEIGHT) | |
3425 | tun->rx_batched = NAPI_POLL_WEIGHT; | |
3426 | else | |
3427 | tun->rx_batched = ec->rx_max_coalesced_frames; | |
3428 | ||
3429 | return 0; | |
3430 | } | |
3431 | ||
7282d491 | 3432 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
3433 | .get_drvinfo = tun_get_drvinfo, |
3434 | .get_msglevel = tun_get_msglevel, | |
3435 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 3436 | .get_link = ethtool_op_get_link, |
eda29772 | 3437 | .get_ts_info = ethtool_op_get_ts_info, |
5503fcec JW |
3438 | .get_coalesce = tun_get_coalesce, |
3439 | .set_coalesce = tun_set_coalesce, | |
29ccc49d | 3440 | .get_link_ksettings = tun_get_link_ksettings, |
4e24f2dd | 3441 | .set_link_ksettings = tun_set_link_ksettings, |
1da177e4 LT |
3442 | }; |
3443 | ||
1576d986 JW |
3444 | static int tun_queue_resize(struct tun_struct *tun) |
3445 | { | |
3446 | struct net_device *dev = tun->dev; | |
3447 | struct tun_file *tfile; | |
5990a305 | 3448 | struct ptr_ring **rings; |
1576d986 JW |
3449 | int n = tun->numqueues + tun->numdisabled; |
3450 | int ret, i; | |
3451 | ||
5990a305 JW |
3452 | rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL); |
3453 | if (!rings) | |
1576d986 JW |
3454 | return -ENOMEM; |
3455 | ||
3456 | for (i = 0; i < tun->numqueues; i++) { | |
3457 | tfile = rtnl_dereference(tun->tfiles[i]); | |
5990a305 | 3458 | rings[i] = &tfile->tx_ring; |
1576d986 JW |
3459 | } |
3460 | list_for_each_entry(tfile, &tun->disabled, next) | |
5990a305 | 3461 | rings[i++] = &tfile->tx_ring; |
1576d986 | 3462 | |
5990a305 JW |
3463 | ret = ptr_ring_resize_multiple(rings, n, |
3464 | dev->tx_queue_len, GFP_KERNEL, | |
fc72d1d5 | 3465 | tun_ptr_free); |
1576d986 | 3466 | |
5990a305 | 3467 | kfree(rings); |
1576d986 JW |
3468 | return ret; |
3469 | } | |
3470 | ||
3471 | static int tun_device_event(struct notifier_block *unused, | |
3472 | unsigned long event, void *ptr) | |
3473 | { | |
3474 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3475 | struct tun_struct *tun = netdev_priv(dev); | |
3476 | ||
86dfb4ac CG |
3477 | if (dev->rtnl_link_ops != &tun_link_ops) |
3478 | return NOTIFY_DONE; | |
3479 | ||
1576d986 JW |
3480 | switch (event) { |
3481 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
3482 | if (tun_queue_resize(tun)) | |
3483 | return NOTIFY_BAD; | |
3484 | break; | |
3485 | default: | |
3486 | break; | |
3487 | } | |
3488 | ||
3489 | return NOTIFY_DONE; | |
3490 | } | |
3491 | ||
3492 | static struct notifier_block tun_notifier_block __read_mostly = { | |
3493 | .notifier_call = tun_device_event, | |
3494 | }; | |
79d17604 | 3495 | |
1da177e4 LT |
3496 | static int __init tun_init(void) |
3497 | { | |
3498 | int ret = 0; | |
3499 | ||
6b8a66ee | 3500 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1da177e4 | 3501 | |
f019a7a5 | 3502 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 3503 | if (ret) { |
6b8a66ee | 3504 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 3505 | goto err_linkops; |
79d17604 PE |
3506 | } |
3507 | ||
1da177e4 | 3508 | ret = misc_register(&tun_miscdev); |
79d17604 | 3509 | if (ret) { |
6b8a66ee | 3510 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
3511 | goto err_misc; |
3512 | } | |
1576d986 | 3513 | |
5edfbd3c TZ |
3514 | ret = register_netdevice_notifier(&tun_notifier_block); |
3515 | if (ret) { | |
3516 | pr_err("Can't register netdevice notifier\n"); | |
3517 | goto err_notifier; | |
3518 | } | |
3519 | ||
f019a7a5 | 3520 | return 0; |
5edfbd3c TZ |
3521 | |
3522 | err_notifier: | |
3523 | misc_deregister(&tun_miscdev); | |
79d17604 | 3524 | err_misc: |
f019a7a5 EB |
3525 | rtnl_link_unregister(&tun_link_ops); |
3526 | err_linkops: | |
1da177e4 LT |
3527 | return ret; |
3528 | } | |
3529 | ||
3530 | static void tun_cleanup(void) | |
3531 | { | |
6aa20a22 | 3532 | misc_deregister(&tun_miscdev); |
f019a7a5 | 3533 | rtnl_link_unregister(&tun_link_ops); |
1576d986 | 3534 | unregister_netdevice_notifier(&tun_notifier_block); |
1da177e4 LT |
3535 | } |
3536 | ||
05c2828c MT |
3537 | /* Get an underlying socket object from tun file. Returns error unless file is |
3538 | * attached to a device. The returned object works like a packet socket, it | |
3539 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
3540 | * holding a reference to the file for as long as the socket is in use. */ | |
3541 | struct socket *tun_get_socket(struct file *file) | |
3542 | { | |
6e914fc7 | 3543 | struct tun_file *tfile; |
05c2828c MT |
3544 | if (file->f_op != &tun_fops) |
3545 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
3546 | tfile = file->private_data; |
3547 | if (!tfile) | |
05c2828c | 3548 | return ERR_PTR(-EBADFD); |
54f968d6 | 3549 | return &tfile->socket; |
05c2828c MT |
3550 | } |
3551 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
3552 | ||
5990a305 | 3553 | struct ptr_ring *tun_get_tx_ring(struct file *file) |
83339c6b JW |
3554 | { |
3555 | struct tun_file *tfile; | |
3556 | ||
3557 | if (file->f_op != &tun_fops) | |
3558 | return ERR_PTR(-EINVAL); | |
3559 | tfile = file->private_data; | |
3560 | if (!tfile) | |
3561 | return ERR_PTR(-EBADFD); | |
5990a305 | 3562 | return &tfile->tx_ring; |
83339c6b | 3563 | } |
5990a305 | 3564 | EXPORT_SYMBOL_GPL(tun_get_tx_ring); |
83339c6b | 3565 | |
1da177e4 LT |
3566 | module_init(tun_init); |
3567 | module_exit(tun_cleanup); | |
3568 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
3569 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
3570 | MODULE_LICENSE("GPL"); | |
3571 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 3572 | MODULE_ALIAS("devname:net/tun"); |