Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * TUN - Universal TUN/TAP device driver. | |
4 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
5 | * | |
1da177e4 LT |
6 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ |
7 | */ | |
8 | ||
9 | /* | |
10 | * Changes: | |
11 | * | |
ff4cc3ac MK |
12 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
13 | * Add TUNSETLINK ioctl to set the link encapsulation | |
14 | * | |
1da177e4 | 15 | * Mark Smith <markzzzsmith@yahoo.com.au> |
344dc8ed | 16 | * Use eth_random_addr() for tap MAC address. |
1da177e4 LT |
17 | * |
18 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
19 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
20 | * Increased default tx queue length. | |
21 | * Added ethtool API. | |
22 | * Minor cleanups | |
23 | * | |
24 | * Daniel Podlejski <underley@underley.eu.org> | |
25 | * Modifications for 2.3.99-pre5 kernel. | |
26 | */ | |
27 | ||
6b8a66ee JP |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
1da177e4 LT |
30 | #define DRV_NAME "tun" |
31 | #define DRV_VERSION "1.6" | |
32 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
33 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
34 | ||
1da177e4 LT |
35 | #include <linux/module.h> |
36 | #include <linux/errno.h> | |
37 | #include <linux/kernel.h> | |
174cd4b1 | 38 | #include <linux/sched/signal.h> |
1da177e4 LT |
39 | #include <linux/major.h> |
40 | #include <linux/slab.h> | |
41 | #include <linux/poll.h> | |
42 | #include <linux/fcntl.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/skbuff.h> | |
45 | #include <linux/netdevice.h> | |
46 | #include <linux/etherdevice.h> | |
47 | #include <linux/miscdevice.h> | |
48 | #include <linux/ethtool.h> | |
49 | #include <linux/rtnetlink.h> | |
50857e2a | 50 | #include <linux/compat.h> |
1da177e4 LT |
51 | #include <linux/if.h> |
52 | #include <linux/if_arp.h> | |
53 | #include <linux/if_ether.h> | |
54 | #include <linux/if_tun.h> | |
6680ec68 | 55 | #include <linux/if_vlan.h> |
1da177e4 | 56 | #include <linux/crc32.h> |
d647a591 | 57 | #include <linux/nsproxy.h> |
f43798c2 | 58 | #include <linux/virtio_net.h> |
99405162 | 59 | #include <linux/rcupdate.h> |
881d966b | 60 | #include <net/net_namespace.h> |
79d17604 | 61 | #include <net/netns/generic.h> |
f019a7a5 | 62 | #include <net/rtnetlink.h> |
33dccbb0 | 63 | #include <net/sock.h> |
735fc405 | 64 | #include <net/xdp.h> |
b9815eb1 | 65 | #include <net/ip_tunnels.h> |
93e14b6d | 66 | #include <linux/seq_file.h> |
e0b46d0e | 67 | #include <linux/uio.h> |
1576d986 | 68 | #include <linux/skb_array.h> |
761876c8 JW |
69 | #include <linux/bpf.h> |
70 | #include <linux/bpf_trace.h> | |
90e33d45 | 71 | #include <linux/mutex.h> |
cca8ea3b PP |
72 | #include <linux/ieee802154.h> |
73 | #include <linux/if_ltalk.h> | |
74 | #include <uapi/linux/if_fddi.h> | |
75 | #include <uapi/linux/if_hippi.h> | |
76 | #include <uapi/linux/if_fc.h> | |
77 | #include <net/ax25.h> | |
78 | #include <net/rose.h> | |
79 | #include <net/6lowpan.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 | ||
7df13219 | 87 | #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
66ccbc9c | 88 | |
031f5e03 MT |
89 | /* TUN device flags */ |
90 | ||
91 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
92 | * overload it to mean fasync when stored there. | |
93 | */ | |
94 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
95 | /* High bits in flags field are unused. */ |
96 | #define TUN_VNET_LE 0x80000000 | |
8b8e658b | 97 | #define TUN_VNET_BE 0x40000000 |
031f5e03 MT |
98 | |
99 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
90e33d45 PP |
100 | IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS) |
101 | ||
0690899b MT |
102 | #define GOODCOPY_LEN 128 |
103 | ||
f271b2cc MK |
104 | #define FLT_EXACT_COUNT 8 |
105 | struct tap_filter { | |
106 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
107 | u32 mask[2]; /* Mask of the hashed addrs */ | |
108 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
109 | }; | |
110 | ||
baf71c5c PG |
111 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
112 | * to max number of VCPUs in guest. */ | |
113 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 114 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 115 | |
96442e42 JW |
116 | #define TUN_FLOW_EXPIRE (3 * HZ) |
117 | ||
54f968d6 | 118 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 119 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
120 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
121 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 122 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 123 | * this). |
6e914fc7 JW |
124 | * |
125 | * RCU usage: | |
36fe8c09 | 126 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 127 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 128 | */ |
631ab46b | 129 | struct tun_file { |
54f968d6 JW |
130 | struct sock sk; |
131 | struct socket socket; | |
6e914fc7 | 132 | struct tun_struct __rcu *tun; |
54f968d6 JW |
133 | struct fasync_struct *fasync; |
134 | /* only used for fasnyc */ | |
135 | unsigned int flags; | |
fb7589a1 PE |
136 | union { |
137 | u16 queue_index; | |
138 | unsigned int ifindex; | |
139 | }; | |
94317099 | 140 | struct napi_struct napi; |
aec72f33 | 141 | bool napi_enabled; |
af3fb24e | 142 | bool napi_frags_enabled; |
90e33d45 | 143 | struct mutex napi_mutex; /* Protects access to the above napi */ |
4008e97f JW |
144 | struct list_head next; |
145 | struct tun_struct *detached; | |
5990a305 | 146 | struct ptr_ring tx_ring; |
8bf5c4ee | 147 | struct xdp_rxq_info xdp_rxq; |
631ab46b EB |
148 | }; |
149 | ||
f9e06c45 JW |
150 | struct tun_page { |
151 | struct page *page; | |
152 | int count; | |
153 | }; | |
154 | ||
96442e42 JW |
155 | struct tun_flow_entry { |
156 | struct hlist_node hash_link; | |
157 | struct rcu_head rcu; | |
158 | struct tun_struct *tun; | |
159 | ||
160 | u32 rxhash; | |
9bc88939 | 161 | u32 rps_rxhash; |
96442e42 | 162 | int queue_index; |
83b1bc12 | 163 | unsigned long updated ____cacheline_aligned_in_smp; |
96442e42 JW |
164 | }; |
165 | ||
166 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
f13b5468 | 167 | #define TUN_MASK_FLOW_ENTRIES (TUN_NUM_FLOW_ENTRIES - 1) |
96442e42 | 168 | |
cd5681d7 | 169 | struct tun_prog { |
96f84061 JW |
170 | struct rcu_head rcu; |
171 | struct bpf_prog *prog; | |
172 | }; | |
173 | ||
54f968d6 | 174 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 175 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
176 | * file were attached to a persist device. |
177 | */ | |
14daa021 | 178 | struct tun_struct { |
c8d68e6b JW |
179 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
180 | unsigned int numqueues; | |
f271b2cc | 181 | unsigned int flags; |
0625c883 EB |
182 | kuid_t owner; |
183 | kgid_t group; | |
14daa021 | 184 | |
14daa021 | 185 | struct net_device *dev; |
c8f44aff | 186 | netdev_features_t set_features; |
88255375 | 187 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
399e0827 | 188 | NETIF_F_TSO6 | NETIF_F_GSO_UDP_L4) |
d9d52b51 | 189 | |
eaea34b2 | 190 | int align; |
d9d52b51 | 191 | int vnet_hdr_sz; |
54f968d6 JW |
192 | int sndbuf; |
193 | struct tap_filter txflt; | |
194 | struct sock_fprog fprog; | |
195 | /* protected by rtnl lock */ | |
196 | bool filter_attached; | |
3424170f | 197 | u32 msg_enable; |
96442e42 | 198 | spinlock_t lock; |
96442e42 JW |
199 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
200 | struct timer_list flow_gc_timer; | |
201 | unsigned long ageing_time; | |
4008e97f JW |
202 | unsigned int numdisabled; |
203 | struct list_head disabled; | |
5dbbaf2d | 204 | void *security; |
b8732fb7 | 205 | u32 flow_count; |
5503fcec | 206 | u32 rx_batched; |
497a5757 | 207 | atomic_long_t rx_frame_errors; |
761876c8 | 208 | struct bpf_prog __rcu *xdp_prog; |
cd5681d7 | 209 | struct tun_prog __rcu *steering_prog; |
aff3d70a | 210 | struct tun_prog __rcu *filter_prog; |
4e24f2dd | 211 | struct ethtool_link_ksettings link_ksettings; |
158b515f GK |
212 | /* init args */ |
213 | struct file *file; | |
214 | struct ifreq *ifr; | |
14daa021 | 215 | }; |
1da177e4 | 216 | |
aff3d70a JW |
217 | struct veth { |
218 | __be16 h_vlan_proto; | |
219 | __be16 h_vlan_TCI; | |
14daa021 | 220 | }; |
1da177e4 | 221 | |
158b515f GK |
222 | static void tun_flow_init(struct tun_struct *tun); |
223 | static void tun_flow_uninit(struct tun_struct *tun); | |
224 | ||
94317099 PP |
225 | static int tun_napi_receive(struct napi_struct *napi, int budget) |
226 | { | |
227 | struct tun_file *tfile = container_of(napi, struct tun_file, napi); | |
228 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
229 | struct sk_buff_head process_queue; | |
230 | struct sk_buff *skb; | |
231 | int received = 0; | |
232 | ||
233 | __skb_queue_head_init(&process_queue); | |
234 | ||
235 | spin_lock(&queue->lock); | |
236 | skb_queue_splice_tail_init(queue, &process_queue); | |
237 | spin_unlock(&queue->lock); | |
238 | ||
239 | while (received < budget && (skb = __skb_dequeue(&process_queue))) { | |
240 | napi_gro_receive(napi, skb); | |
241 | ++received; | |
242 | } | |
243 | ||
244 | if (!skb_queue_empty(&process_queue)) { | |
245 | spin_lock(&queue->lock); | |
246 | skb_queue_splice(&process_queue, queue); | |
247 | spin_unlock(&queue->lock); | |
248 | } | |
249 | ||
250 | return received; | |
251 | } | |
252 | ||
253 | static int tun_napi_poll(struct napi_struct *napi, int budget) | |
254 | { | |
255 | unsigned int received; | |
256 | ||
257 | received = tun_napi_receive(napi, budget); | |
258 | ||
259 | if (received < budget) | |
260 | napi_complete_done(napi, received); | |
261 | ||
262 | return received; | |
263 | } | |
264 | ||
265 | static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile, | |
af3fb24e | 266 | bool napi_en, bool napi_frags) |
94317099 | 267 | { |
aec72f33 | 268 | tfile->napi_enabled = napi_en; |
af3fb24e | 269 | tfile->napi_frags_enabled = napi_en && napi_frags; |
94317099 | 270 | if (napi_en) { |
16d083e2 | 271 | netif_napi_add_tx(tun->dev, &tfile->napi, tun_napi_poll); |
94317099 PP |
272 | napi_enable(&tfile->napi); |
273 | } | |
274 | } | |
275 | ||
a8fc8cb5 JK |
276 | static void tun_napi_enable(struct tun_file *tfile) |
277 | { | |
278 | if (tfile->napi_enabled) | |
279 | napi_enable(&tfile->napi); | |
280 | } | |
281 | ||
06e55add | 282 | static void tun_napi_disable(struct tun_file *tfile) |
94317099 | 283 | { |
aec72f33 | 284 | if (tfile->napi_enabled) |
94317099 PP |
285 | napi_disable(&tfile->napi); |
286 | } | |
287 | ||
06e55add | 288 | static void tun_napi_del(struct tun_file *tfile) |
94317099 | 289 | { |
aec72f33 | 290 | if (tfile->napi_enabled) |
94317099 PP |
291 | netif_napi_del(&tfile->napi); |
292 | } | |
293 | ||
af3fb24e | 294 | static bool tun_napi_frags_enabled(const struct tun_file *tfile) |
90e33d45 | 295 | { |
af3fb24e | 296 | return tfile->napi_frags_enabled; |
90e33d45 PP |
297 | } |
298 | ||
8b8e658b GK |
299 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
300 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
301 | { | |
302 | return tun->flags & TUN_VNET_BE ? false : | |
303 | virtio_legacy_is_little_endian(); | |
304 | } | |
305 | ||
306 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
307 | { | |
308 | int be = !!(tun->flags & TUN_VNET_BE); | |
309 | ||
310 | if (put_user(be, argp)) | |
311 | return -EFAULT; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
317 | { | |
318 | int be; | |
319 | ||
320 | if (get_user(be, argp)) | |
321 | return -EFAULT; | |
322 | ||
323 | if (be) | |
324 | tun->flags |= TUN_VNET_BE; | |
325 | else | |
326 | tun->flags &= ~TUN_VNET_BE; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | #else | |
331 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
332 | { | |
333 | return virtio_legacy_is_little_endian(); | |
334 | } | |
335 | ||
336 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
337 | { | |
338 | return -EINVAL; | |
339 | } | |
340 | ||
341 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
342 | { | |
343 | return -EINVAL; | |
344 | } | |
345 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
346 | ||
25bd55bb GK |
347 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
348 | { | |
7d824109 | 349 | return tun->flags & TUN_VNET_LE || |
8b8e658b | 350 | tun_legacy_is_little_endian(tun); |
25bd55bb GK |
351 | } |
352 | ||
56f0dcc5 MT |
353 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
354 | { | |
25bd55bb | 355 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
356 | } |
357 | ||
358 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
359 | { | |
25bd55bb | 360 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
361 | } |
362 | ||
96442e42 JW |
363 | static inline u32 tun_hashfn(u32 rxhash) |
364 | { | |
f13b5468 | 365 | return rxhash & TUN_MASK_FLOW_ENTRIES; |
96442e42 JW |
366 | } |
367 | ||
368 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
369 | { | |
370 | struct tun_flow_entry *e; | |
96442e42 | 371 | |
b67bfe0d | 372 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
373 | if (e->rxhash == rxhash) |
374 | return e; | |
375 | } | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
380 | struct hlist_head *head, | |
381 | u32 rxhash, u16 queue_index) | |
382 | { | |
9fdc6bef ED |
383 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
384 | ||
96442e42 | 385 | if (e) { |
3424170f MK |
386 | netif_info(tun, tx_queued, tun->dev, |
387 | "create flow: hash %u index %u\n", | |
388 | rxhash, queue_index); | |
96442e42 JW |
389 | e->updated = jiffies; |
390 | e->rxhash = rxhash; | |
9bc88939 | 391 | e->rps_rxhash = 0; |
96442e42 JW |
392 | e->queue_index = queue_index; |
393 | e->tun = tun; | |
394 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 395 | ++tun->flow_count; |
96442e42 JW |
396 | } |
397 | return e; | |
398 | } | |
399 | ||
96442e42 JW |
400 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
401 | { | |
3424170f MK |
402 | netif_info(tun, tx_queued, tun->dev, "delete flow: hash %u index %u\n", |
403 | e->rxhash, e->queue_index); | |
96442e42 | 404 | hlist_del_rcu(&e->hash_link); |
9fdc6bef | 405 | kfree_rcu(e, rcu); |
b8732fb7 | 406 | --tun->flow_count; |
96442e42 JW |
407 | } |
408 | ||
409 | static void tun_flow_flush(struct tun_struct *tun) | |
410 | { | |
411 | int i; | |
412 | ||
413 | spin_lock_bh(&tun->lock); | |
414 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
415 | struct tun_flow_entry *e; | |
b67bfe0d | 416 | struct hlist_node *n; |
96442e42 | 417 | |
b67bfe0d | 418 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
419 | tun_flow_delete(tun, e); |
420 | } | |
421 | spin_unlock_bh(&tun->lock); | |
422 | } | |
423 | ||
424 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
425 | { | |
426 | int i; | |
427 | ||
428 | spin_lock_bh(&tun->lock); | |
429 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
430 | struct tun_flow_entry *e; | |
b67bfe0d | 431 | struct hlist_node *n; |
96442e42 | 432 | |
b67bfe0d | 433 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
434 | if (e->queue_index == queue_index) |
435 | tun_flow_delete(tun, e); | |
436 | } | |
437 | } | |
438 | spin_unlock_bh(&tun->lock); | |
439 | } | |
440 | ||
e99e88a9 | 441 | static void tun_flow_cleanup(struct timer_list *t) |
96442e42 | 442 | { |
e99e88a9 | 443 | struct tun_struct *tun = from_timer(tun, t, flow_gc_timer); |
96442e42 JW |
444 | unsigned long delay = tun->ageing_time; |
445 | unsigned long next_timer = jiffies + delay; | |
446 | unsigned long count = 0; | |
447 | int i; | |
448 | ||
7dbfb4ef | 449 | spin_lock(&tun->lock); |
96442e42 JW |
450 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
451 | struct tun_flow_entry *e; | |
b67bfe0d | 452 | struct hlist_node *n; |
96442e42 | 453 | |
b67bfe0d | 454 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 | 455 | unsigned long this_timer; |
81d98fa4 | 456 | |
96442e42 | 457 | this_timer = e->updated + delay; |
81d98fa4 | 458 | if (time_before_eq(this_timer, jiffies)) { |
96442e42 | 459 | tun_flow_delete(tun, e); |
81d98fa4 ED |
460 | continue; |
461 | } | |
462 | count++; | |
463 | if (time_before(this_timer, next_timer)) | |
96442e42 JW |
464 | next_timer = this_timer; |
465 | } | |
466 | } | |
467 | ||
468 | if (count) | |
469 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
7dbfb4ef | 470 | spin_unlock(&tun->lock); |
96442e42 JW |
471 | } |
472 | ||
49974420 | 473 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 474 | struct tun_file *tfile) |
96442e42 JW |
475 | { |
476 | struct hlist_head *head; | |
477 | struct tun_flow_entry *e; | |
478 | unsigned long delay = tun->ageing_time; | |
9e85722d | 479 | u16 queue_index = tfile->queue_index; |
96442e42 | 480 | |
5c327f67 | 481 | head = &tun->flows[tun_hashfn(rxhash)]; |
96442e42 JW |
482 | |
483 | rcu_read_lock(); | |
484 | ||
96442e42 JW |
485 | e = tun_flow_find(head, rxhash); |
486 | if (likely(e)) { | |
487 | /* TODO: keep queueing to old queue until it's empty? */ | |
4ffdd22e ED |
488 | if (READ_ONCE(e->queue_index) != queue_index) |
489 | WRITE_ONCE(e->queue_index, queue_index); | |
83b1bc12 LR |
490 | if (e->updated != jiffies) |
491 | e->updated = jiffies; | |
9bc88939 | 492 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
493 | } else { |
494 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
495 | if (!tun_flow_find(head, rxhash) && |
496 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
497 | tun_flow_create(tun, head, rxhash, queue_index); |
498 | ||
499 | if (!timer_pending(&tun->flow_gc_timer)) | |
500 | mod_timer(&tun->flow_gc_timer, | |
501 | round_jiffies_up(jiffies + delay)); | |
502 | spin_unlock_bh(&tun->lock); | |
503 | } | |
504 | ||
96442e42 JW |
505 | rcu_read_unlock(); |
506 | } | |
507 | ||
516c512b | 508 | /* Save the hash received in the stack receive path and update the |
9bc88939 TH |
509 | * flow_hash table accordingly. |
510 | */ | |
511 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
512 | { | |
567e4b79 | 513 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 514 | e->rps_rxhash = hash; |
9bc88939 TH |
515 | } |
516 | ||
4b035271 | 517 | /* We try to identify a flow through its rxhash. The reason that |
92d4ea6e | 518 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
519 | * the rxq based on the txq where the last packet of the flow comes. As |
520 | * the userspace application move between processors, we may get a | |
4b035271 | 521 | * different rxq no. here. |
c8d68e6b | 522 | */ |
96f84061 | 523 | static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
c8d68e6b | 524 | { |
96442e42 | 525 | struct tun_flow_entry *e; |
c8d68e6b JW |
526 | u32 txq = 0; |
527 | u32 numqueues = 0; | |
528 | ||
6aa7de05 | 529 | numqueues = READ_ONCE(tun->numqueues); |
c8d68e6b | 530 | |
feec084a | 531 | txq = __skb_get_hash_symmetric(skb); |
4b035271 WL |
532 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
533 | if (e) { | |
534 | tun_flow_save_rps_rxhash(e, txq); | |
535 | txq = e->queue_index; | |
536 | } else { | |
537 | /* use multiply and shift instead of expensive divide */ | |
538 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
539 | } |
540 | ||
c8d68e6b JW |
541 | return txq; |
542 | } | |
543 | ||
96f84061 JW |
544 | static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
545 | { | |
cd5681d7 | 546 | struct tun_prog *prog; |
a35d310f | 547 | u32 numqueues; |
96f84061 JW |
548 | u16 ret = 0; |
549 | ||
a35d310f JW |
550 | numqueues = READ_ONCE(tun->numqueues); |
551 | if (!numqueues) | |
552 | return 0; | |
553 | ||
96f84061 JW |
554 | prog = rcu_dereference(tun->steering_prog); |
555 | if (prog) | |
556 | ret = bpf_prog_run_clear_cb(prog->prog, skb); | |
557 | ||
a35d310f | 558 | return ret % numqueues; |
96f84061 JW |
559 | } |
560 | ||
561 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, | |
a350ecce | 562 | struct net_device *sb_dev) |
96f84061 JW |
563 | { |
564 | struct tun_struct *tun = netdev_priv(dev); | |
565 | u16 ret; | |
566 | ||
567 | rcu_read_lock(); | |
568 | if (rcu_dereference(tun->steering_prog)) | |
569 | ret = tun_ebpf_select_queue(tun, skb); | |
570 | else | |
571 | ret = tun_automq_select_queue(tun, skb); | |
572 | rcu_read_unlock(); | |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
cde8b15f JW |
577 | static inline bool tun_not_capable(struct tun_struct *tun) |
578 | { | |
579 | const struct cred *cred = current_cred(); | |
c260b772 | 580 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
581 | |
582 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
583 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 584 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
585 | } |
586 | ||
c8d68e6b JW |
587 | static void tun_set_real_num_queues(struct tun_struct *tun) |
588 | { | |
589 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
590 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
591 | } | |
592 | ||
4008e97f JW |
593 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
594 | { | |
595 | tfile->detached = tun; | |
596 | list_add_tail(&tfile->next, &tun->disabled); | |
597 | ++tun->numdisabled; | |
598 | } | |
599 | ||
d32649d1 | 600 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
601 | { |
602 | struct tun_struct *tun = tfile->detached; | |
603 | ||
604 | tfile->detached = NULL; | |
605 | list_del_init(&tfile->next); | |
606 | --tun->numdisabled; | |
607 | return tun; | |
608 | } | |
609 | ||
3a403076 | 610 | void tun_ptr_free(void *ptr) |
fc72d1d5 JW |
611 | { |
612 | if (!ptr) | |
613 | return; | |
1ffcbc85 JDB |
614 | if (tun_is_xdp_frame(ptr)) { |
615 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 616 | |
03993094 | 617 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
618 | } else { |
619 | __skb_array_destroy_skb(ptr); | |
620 | } | |
621 | } | |
3a403076 | 622 | EXPORT_SYMBOL_GPL(tun_ptr_free); |
fc72d1d5 | 623 | |
4bfb0513 JW |
624 | static void tun_queue_purge(struct tun_file *tfile) |
625 | { | |
fc72d1d5 | 626 | void *ptr; |
1576d986 | 627 | |
fc72d1d5 JW |
628 | while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL) |
629 | tun_ptr_free(ptr); | |
1576d986 | 630 | |
5503fcec | 631 | skb_queue_purge(&tfile->sk.sk_write_queue); |
4bfb0513 JW |
632 | skb_queue_purge(&tfile->sk.sk_error_queue); |
633 | } | |
634 | ||
c8d68e6b JW |
635 | static void __tun_detach(struct tun_file *tfile, bool clean) |
636 | { | |
637 | struct tun_file *ntfile; | |
638 | struct tun_struct *tun; | |
c8d68e6b | 639 | |
b8deabd3 JW |
640 | tun = rtnl_dereference(tfile->tun); |
641 | ||
94317099 | 642 | if (tun && clean) { |
ff1fa208 JK |
643 | if (!tfile->detached) |
644 | tun_napi_disable(tfile); | |
06e55add | 645 | tun_napi_del(tfile); |
94317099 PP |
646 | } |
647 | ||
9e85722d | 648 | if (tun && !tfile->detached) { |
c8d68e6b JW |
649 | u16 index = tfile->queue_index; |
650 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
651 | |
652 | rcu_assign_pointer(tun->tfiles[index], | |
653 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 654 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b | 655 | ntfile->queue_index = index; |
9871a9e4 JW |
656 | rcu_assign_pointer(tun->tfiles[tun->numqueues - 1], |
657 | NULL); | |
c8d68e6b JW |
658 | |
659 | --tun->numqueues; | |
9e85722d | 660 | if (clean) { |
c956674b | 661 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 662 | sock_put(&tfile->sk); |
a8fc8cb5 | 663 | } else { |
4008e97f | 664 | tun_disable_queue(tun, tfile); |
a8fc8cb5 JK |
665 | tun_napi_disable(tfile); |
666 | } | |
c8d68e6b JW |
667 | |
668 | synchronize_net(); | |
96442e42 | 669 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 670 | /* Drop read queue */ |
4bfb0513 | 671 | tun_queue_purge(tfile); |
c8d68e6b | 672 | tun_set_real_num_queues(tun); |
dd38bd85 | 673 | } else if (tfile->detached && clean) { |
4008e97f | 674 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
675 | sock_put(&tfile->sk); |
676 | } | |
c8d68e6b JW |
677 | |
678 | if (clean) { | |
af668b3c MT |
679 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
680 | netif_carrier_off(tun->dev); | |
681 | ||
40630b82 | 682 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 683 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 684 | unregister_netdevice(tun->dev); |
af668b3c | 685 | } |
b196d88a JW |
686 | if (tun) |
687 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
7063efd3 | 688 | ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free); |
c8d68e6b JW |
689 | } |
690 | } | |
691 | ||
692 | static void tun_detach(struct tun_file *tfile, bool clean) | |
693 | { | |
83c1f36f SD |
694 | struct tun_struct *tun; |
695 | struct net_device *dev; | |
696 | ||
c8d68e6b | 697 | rtnl_lock(); |
83c1f36f SD |
698 | tun = rtnl_dereference(tfile->tun); |
699 | dev = tun ? tun->dev : NULL; | |
c8d68e6b | 700 | __tun_detach(tfile, clean); |
83c1f36f SD |
701 | if (dev) |
702 | netdev_state_change(dev); | |
c8d68e6b | 703 | rtnl_unlock(); |
5daadc86 SY |
704 | |
705 | if (clean) | |
706 | sock_put(&tfile->sk); | |
c8d68e6b JW |
707 | } |
708 | ||
709 | static void tun_detach_all(struct net_device *dev) | |
710 | { | |
711 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 712 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
713 | int i, n = tun->numqueues; |
714 | ||
715 | for (i = 0; i < n; i++) { | |
b8deabd3 | 716 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 717 | BUG_ON(!tfile); |
06e55add | 718 | tun_napi_disable(tfile); |
addf8fc4 | 719 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 720 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 721 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
722 | --tun->numqueues; |
723 | } | |
9e85722d | 724 | list_for_each_entry(tfile, &tun->disabled, next) { |
addf8fc4 | 725 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 726 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 727 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 728 | } |
c8d68e6b JW |
729 | BUG_ON(tun->numqueues != 0); |
730 | ||
731 | synchronize_net(); | |
732 | for (i = 0; i < n; i++) { | |
b8deabd3 | 733 | tfile = rtnl_dereference(tun->tfiles[i]); |
06e55add | 734 | tun_napi_del(tfile); |
c8d68e6b | 735 | /* Drop read queue */ |
4bfb0513 | 736 | tun_queue_purge(tfile); |
b196d88a | 737 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
c8d68e6b JW |
738 | sock_put(&tfile->sk); |
739 | } | |
4008e97f | 740 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
3b9bc84d | 741 | tun_napi_del(tfile); |
4008e97f | 742 | tun_enable_queue(tfile); |
4bfb0513 | 743 | tun_queue_purge(tfile); |
b196d88a | 744 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
4008e97f JW |
745 | sock_put(&tfile->sk); |
746 | } | |
747 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 748 | |
40630b82 | 749 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 750 | module_put(THIS_MODULE); |
c8d68e6b JW |
751 | } |
752 | ||
94317099 | 753 | static int tun_attach(struct tun_struct *tun, struct file *file, |
77f22f92 YY |
754 | bool skip_filter, bool napi, bool napi_frags, |
755 | bool publish_tun) | |
a7385ba2 | 756 | { |
631ab46b | 757 | struct tun_file *tfile = file->private_data; |
1576d986 | 758 | struct net_device *dev = tun->dev; |
38231b7a | 759 | int err; |
a7385ba2 | 760 | |
5dbbaf2d PM |
761 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
762 | if (err < 0) | |
763 | goto out; | |
764 | ||
38231b7a | 765 | err = -EINVAL; |
9e85722d | 766 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
767 | goto out; |
768 | ||
769 | err = -EBUSY; | |
40630b82 | 770 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
771 | goto out; |
772 | ||
773 | err = -E2BIG; | |
4008e97f JW |
774 | if (!tfile->detached && |
775 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
776 | goto out; |
777 | ||
778 | err = 0; | |
54f968d6 | 779 | |
92d4ea6e | 780 | /* Re-attach the filter to persist device */ |
849c9b6f | 781 | if (!skip_filter && (tun->filter_attached == true)) { |
8ced425e HFS |
782 | lock_sock(tfile->socket.sk); |
783 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
784 | release_sock(tfile->socket.sk); | |
54f968d6 JW |
785 | if (!err) |
786 | goto out; | |
787 | } | |
1576d986 JW |
788 | |
789 | if (!tfile->detached && | |
b196d88a JW |
790 | ptr_ring_resize(&tfile->tx_ring, dev->tx_queue_len, |
791 | GFP_KERNEL, tun_ptr_free)) { | |
1576d986 JW |
792 | err = -ENOMEM; |
793 | goto out; | |
794 | } | |
795 | ||
c8d68e6b | 796 | tfile->queue_index = tun->numqueues; |
addf8fc4 | 797 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
8bf5c4ee JDB |
798 | |
799 | if (tfile->detached) { | |
800 | /* Re-attach detached tfile, updating XDP queue_index */ | |
801 | WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq)); | |
802 | ||
803 | if (tfile->xdp_rxq.queue_index != tfile->queue_index) | |
804 | tfile->xdp_rxq.queue_index = tfile->queue_index; | |
805 | } else { | |
806 | /* Setup XDP RX-queue info, for new tfile getting attached */ | |
807 | err = xdp_rxq_info_reg(&tfile->xdp_rxq, | |
b02e5a0e | 808 | tun->dev, tfile->queue_index, 0); |
8bf5c4ee JDB |
809 | if (err < 0) |
810 | goto out; | |
8d5d8852 JDB |
811 | err = xdp_rxq_info_reg_mem_model(&tfile->xdp_rxq, |
812 | MEM_TYPE_PAGE_SHARED, NULL); | |
813 | if (err < 0) { | |
814 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
815 | goto out; | |
816 | } | |
8bf5c4ee JDB |
817 | err = 0; |
818 | } | |
819 | ||
94317099 | 820 | if (tfile->detached) { |
4008e97f | 821 | tun_enable_queue(tfile); |
a8fc8cb5 | 822 | tun_napi_enable(tfile); |
94317099 | 823 | } else { |
4008e97f | 824 | sock_hold(&tfile->sk); |
af3fb24e | 825 | tun_napi_init(tun, tfile, napi, napi_frags); |
94317099 | 826 | } |
4008e97f | 827 | |
e4a2a304 JW |
828 | if (rtnl_dereference(tun->xdp_prog)) |
829 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
830 | ||
c8d68e6b JW |
831 | /* device is allowed to go away first, so no need to hold extra |
832 | * refcnt. | |
833 | */ | |
834 | ||
0b7959b6 SF |
835 | /* Publish tfile->tun and tun->tfiles only after we've fully |
836 | * initialized tfile; otherwise we risk using half-initialized | |
837 | * object. | |
838 | */ | |
77f22f92 YY |
839 | if (publish_tun) |
840 | rcu_assign_pointer(tfile->tun, tun); | |
0b7959b6 SF |
841 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
842 | tun->numqueues++; | |
3a03cb84 | 843 | tun_set_real_num_queues(tun); |
c8d68e6b JW |
844 | out: |
845 | return err; | |
631ab46b EB |
846 | } |
847 | ||
9484dc74 | 848 | static struct tun_struct *tun_get(struct tun_file *tfile) |
631ab46b | 849 | { |
6e914fc7 | 850 | struct tun_struct *tun; |
c70f1829 | 851 | |
6e914fc7 JW |
852 | rcu_read_lock(); |
853 | tun = rcu_dereference(tfile->tun); | |
854 | if (tun) | |
855 | dev_hold(tun->dev); | |
856 | rcu_read_unlock(); | |
c70f1829 EB |
857 | |
858 | return tun; | |
631ab46b EB |
859 | } |
860 | ||
631ab46b EB |
861 | static void tun_put(struct tun_struct *tun) |
862 | { | |
6e914fc7 | 863 | dev_put(tun->dev); |
631ab46b EB |
864 | } |
865 | ||
6b8a66ee | 866 | /* TAP filtering */ |
f271b2cc MK |
867 | static void addr_hash_set(u32 *mask, const u8 *addr) |
868 | { | |
869 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
870 | mask[n >> 5] |= (1 << (n & 31)); | |
871 | } | |
872 | ||
873 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
874 | { | |
875 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
876 | return mask[n >> 5] & (1 << (n & 31)); | |
877 | } | |
878 | ||
879 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
880 | { | |
881 | struct { u8 u[ETH_ALEN]; } *addr; | |
882 | struct tun_filter uf; | |
883 | int err, alen, n, nexact; | |
884 | ||
885 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
886 | return -EFAULT; | |
887 | ||
888 | if (!uf.count) { | |
889 | /* Disabled */ | |
890 | filter->count = 0; | |
891 | return 0; | |
892 | } | |
893 | ||
894 | alen = ETH_ALEN * uf.count; | |
28e8190d ME |
895 | addr = memdup_user(arg + sizeof(uf), alen); |
896 | if (IS_ERR(addr)) | |
897 | return PTR_ERR(addr); | |
f271b2cc MK |
898 | |
899 | /* The filter is updated without holding any locks. Which is | |
900 | * perfectly safe. We disable it first and in the worst | |
901 | * case we'll accept a few undesired packets. */ | |
902 | filter->count = 0; | |
903 | wmb(); | |
904 | ||
905 | /* Use first set of addresses as an exact filter */ | |
906 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
907 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
908 | ||
909 | nexact = n; | |
910 | ||
cfbf84fc AW |
911 | /* Remaining multicast addresses are hashed, |
912 | * unicast will leave the filter disabled. */ | |
f271b2cc | 913 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
914 | for (; n < uf.count; n++) { |
915 | if (!is_multicast_ether_addr(addr[n].u)) { | |
916 | err = 0; /* no filter */ | |
3b8d2a69 | 917 | goto free_addr; |
cfbf84fc | 918 | } |
f271b2cc | 919 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 920 | } |
f271b2cc MK |
921 | |
922 | /* For ALLMULTI just set the mask to all ones. | |
923 | * This overrides the mask populated above. */ | |
924 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
925 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
926 | ||
927 | /* Now enable the filter */ | |
928 | wmb(); | |
929 | filter->count = nexact; | |
930 | ||
931 | /* Return the number of exact filters */ | |
932 | err = nexact; | |
3b8d2a69 | 933 | free_addr: |
f271b2cc MK |
934 | kfree(addr); |
935 | return err; | |
936 | } | |
937 | ||
938 | /* Returns: 0 - drop, !=0 - accept */ | |
939 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
940 | { | |
941 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
942 | * at this point. */ | |
943 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
944 | int i; | |
945 | ||
946 | /* Exact match */ | |
947 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 948 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
949 | return 1; |
950 | ||
951 | /* Inexact match (multicast only) */ | |
952 | if (is_multicast_ether_addr(eh->h_dest)) | |
953 | return addr_hash_test(filter->mask, eh->h_dest); | |
954 | ||
955 | return 0; | |
956 | } | |
957 | ||
958 | /* | |
959 | * Checks whether the packet is accepted or not. | |
960 | * Returns: 0 - drop, !=0 - accept | |
961 | */ | |
962 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
963 | { | |
964 | if (!filter->count) | |
965 | return 1; | |
966 | ||
967 | return run_filter(filter, skb); | |
968 | } | |
969 | ||
1da177e4 LT |
970 | /* Network device part of the driver */ |
971 | ||
7282d491 | 972 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 973 | |
158b515f GK |
974 | static int tun_net_init(struct net_device *dev) |
975 | { | |
976 | struct tun_struct *tun = netdev_priv(dev); | |
977 | struct ifreq *ifr = tun->ifr; | |
978 | int err; | |
979 | ||
980 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
981 | if (!dev->tstats) | |
982 | return -ENOMEM; | |
983 | ||
984 | spin_lock_init(&tun->lock); | |
985 | ||
986 | err = security_tun_dev_alloc_security(&tun->security); | |
987 | if (err < 0) { | |
988 | free_percpu(dev->tstats); | |
989 | return err; | |
990 | } | |
991 | ||
992 | tun_flow_init(tun); | |
993 | ||
994 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | | |
995 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | | |
996 | NETIF_F_HW_VLAN_STAG_TX; | |
997 | dev->features = dev->hw_features | NETIF_F_LLTX; | |
998 | dev->vlan_features = dev->features & | |
999 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
1000 | NETIF_F_HW_VLAN_STAG_TX); | |
1001 | ||
1002 | tun->flags = (tun->flags & ~TUN_FEATURES) | | |
1003 | (ifr->ifr_flags & TUN_FEATURES); | |
1004 | ||
1005 | INIT_LIST_HEAD(&tun->disabled); | |
1006 | err = tun_attach(tun, tun->file, false, ifr->ifr_flags & IFF_NAPI, | |
1007 | ifr->ifr_flags & IFF_NAPI_FRAGS, false); | |
1008 | if (err < 0) { | |
1009 | tun_flow_uninit(tun); | |
1010 | security_tun_dev_free_security(tun->security); | |
1011 | free_percpu(dev->tstats); | |
1012 | return err; | |
1013 | } | |
1014 | return 0; | |
1015 | } | |
1016 | ||
c70f1829 EB |
1017 | /* Net device detach from fd. */ |
1018 | static void tun_net_uninit(struct net_device *dev) | |
1019 | { | |
c8d68e6b | 1020 | tun_detach_all(dev); |
c70f1829 EB |
1021 | } |
1022 | ||
1da177e4 LT |
1023 | /* Net device open. */ |
1024 | static int tun_net_open(struct net_device *dev) | |
1025 | { | |
c8d68e6b | 1026 | netif_tx_start_all_queues(dev); |
b20e2d54 | 1027 | |
1da177e4 LT |
1028 | return 0; |
1029 | } | |
1030 | ||
1031 | /* Net device close. */ | |
1032 | static int tun_net_close(struct net_device *dev) | |
1033 | { | |
c8d68e6b | 1034 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
1035 | return 0; |
1036 | } | |
1037 | ||
1038 | /* Net device start xmit */ | |
96f84061 | 1039 | static void tun_automq_xmit(struct tun_struct *tun, struct sk_buff *skb) |
1da177e4 | 1040 | { |
3df97ba8 | 1041 | #ifdef CONFIG_RPS |
dc05360f | 1042 | if (tun->numqueues == 1 && static_branch_unlikely(&rps_needed)) { |
9bc88939 TH |
1043 | /* Select queue was not called for the skbuff, so we extract the |
1044 | * RPS hash and save it into the flow_table here. | |
1045 | */ | |
4b035271 | 1046 | struct tun_flow_entry *e; |
9bc88939 TH |
1047 | __u32 rxhash; |
1048 | ||
feec084a | 1049 | rxhash = __skb_get_hash_symmetric(skb); |
4b035271 WL |
1050 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], rxhash); |
1051 | if (e) | |
1052 | tun_flow_save_rps_rxhash(e, rxhash); | |
9bc88939 | 1053 | } |
3df97ba8 | 1054 | #endif |
96f84061 JW |
1055 | } |
1056 | ||
aff3d70a JW |
1057 | static unsigned int run_ebpf_filter(struct tun_struct *tun, |
1058 | struct sk_buff *skb, | |
1059 | int len) | |
1060 | { | |
1061 | struct tun_prog *prog = rcu_dereference(tun->filter_prog); | |
1062 | ||
1063 | if (prog) | |
1064 | len = bpf_prog_run_clear_cb(prog->prog, skb); | |
1065 | ||
1066 | return len; | |
1067 | } | |
1068 | ||
96f84061 JW |
1069 | /* Net device start xmit */ |
1070 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
1071 | { | |
1072 | struct tun_struct *tun = netdev_priv(dev); | |
4b4f052e | 1073 | enum skb_drop_reason drop_reason; |
96f84061 | 1074 | int txq = skb->queue_mapping; |
a31d27fb | 1075 | struct netdev_queue *queue; |
96f84061 | 1076 | struct tun_file *tfile; |
aff3d70a | 1077 | int len = skb->len; |
96f84061 JW |
1078 | |
1079 | rcu_read_lock(); | |
1080 | tfile = rcu_dereference(tun->tfiles[txq]); | |
96f84061 JW |
1081 | |
1082 | /* Drop packet if interface is not attached */ | |
4b4f052e DZ |
1083 | if (!tfile) { |
1084 | drop_reason = SKB_DROP_REASON_DEV_READY; | |
96f84061 | 1085 | goto drop; |
4b4f052e | 1086 | } |
96f84061 JW |
1087 | |
1088 | if (!rcu_dereference(tun->steering_prog)) | |
1089 | tun_automq_xmit(tun, skb); | |
9bc88939 | 1090 | |
3424170f | 1091 | netif_info(tun, tx_queued, tun->dev, "%s %d\n", __func__, skb->len); |
6e914fc7 | 1092 | |
f271b2cc MK |
1093 | /* Drop if the filter does not like it. |
1094 | * This is a noop if the filter is disabled. | |
1095 | * Filter can be enabled only for the TAP devices. */ | |
4b4f052e DZ |
1096 | if (!check_filter(&tun->txflt, skb)) { |
1097 | drop_reason = SKB_DROP_REASON_TAP_TXFILTER; | |
f271b2cc | 1098 | goto drop; |
4b4f052e | 1099 | } |
f271b2cc | 1100 | |
54f968d6 | 1101 | if (tfile->socket.sk->sk_filter && |
4b4f052e DZ |
1102 | sk_filter(tfile->socket.sk, skb)) { |
1103 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
99405162 | 1104 | goto drop; |
4b4f052e | 1105 | } |
99405162 | 1106 | |
aff3d70a | 1107 | len = run_ebpf_filter(tun, skb, len); |
4b4f052e DZ |
1108 | if (len == 0) { |
1109 | drop_reason = SKB_DROP_REASON_TAP_FILTER; | |
45a15d89 | 1110 | goto drop; |
4b4f052e | 1111 | } |
45a15d89 | 1112 | |
4b4f052e DZ |
1113 | if (pskb_trim(skb, len)) { |
1114 | drop_reason = SKB_DROP_REASON_NOMEM; | |
aff3d70a | 1115 | goto drop; |
4b4f052e | 1116 | } |
aff3d70a | 1117 | |
4b4f052e DZ |
1118 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) { |
1119 | drop_reason = SKB_DROP_REASON_SKB_UCOPY_FAULT; | |
7bf66305 | 1120 | goto drop; |
4b4f052e | 1121 | } |
7bf66305 | 1122 | |
7b996243 | 1123 | skb_tx_timestamp(skb); |
eda29772 | 1124 | |
0110d6f2 | 1125 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
1126 | * for indefinite time. |
1127 | */ | |
0110d6f2 MT |
1128 | skb_orphan(skb); |
1129 | ||
895b5c9f | 1130 | nf_reset_ct(skb); |
f8af75f3 | 1131 | |
4b4f052e DZ |
1132 | if (ptr_ring_produce(&tfile->tx_ring, skb)) { |
1133 | drop_reason = SKB_DROP_REASON_FULL_RING; | |
1576d986 | 1134 | goto drop; |
4b4f052e | 1135 | } |
1da177e4 | 1136 | |
a31d27fb ND |
1137 | /* NETIF_F_LLTX requires to do our own update of trans_start */ |
1138 | queue = netdev_get_tx_queue(dev, txq); | |
968a1a5d | 1139 | txq_trans_cond_update(queue); |
a31d27fb | 1140 | |
1da177e4 | 1141 | /* Notify and wake up reader process */ |
54f968d6 JW |
1142 | if (tfile->flags & TUN_FASYNC) |
1143 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 1144 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
1145 | |
1146 | rcu_read_unlock(); | |
6ed10654 | 1147 | return NETDEV_TX_OK; |
1da177e4 LT |
1148 | |
1149 | drop: | |
625788b5 | 1150 | dev_core_stats_tx_dropped_inc(dev); |
149d36f7 | 1151 | skb_tx_error(skb); |
4b4f052e | 1152 | kfree_skb_reason(skb, drop_reason); |
6e914fc7 | 1153 | rcu_read_unlock(); |
baeababb | 1154 | return NET_XMIT_DROP; |
1da177e4 LT |
1155 | } |
1156 | ||
f271b2cc | 1157 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 1158 | { |
f271b2cc MK |
1159 | /* |
1160 | * This callback is supposed to deal with mc filter in | |
1161 | * _rx_ path and has nothing to do with the _tx_ path. | |
1162 | * In rx path we always accept everything userspace gives us. | |
1163 | */ | |
1da177e4 LT |
1164 | } |
1165 | ||
c8f44aff MM |
1166 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
1167 | netdev_features_t features) | |
88255375 MM |
1168 | { |
1169 | struct tun_struct *tun = netdev_priv(dev); | |
1170 | ||
1171 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
1172 | } | |
eaea34b2 PA |
1173 | |
1174 | static void tun_set_headroom(struct net_device *dev, int new_hr) | |
1175 | { | |
1176 | struct tun_struct *tun = netdev_priv(dev); | |
1177 | ||
1178 | if (new_hr < NET_SKB_PAD) | |
1179 | new_hr = NET_SKB_PAD; | |
1180 | ||
1181 | tun->align = new_hr; | |
1182 | } | |
1183 | ||
bc1f4470 | 1184 | static void |
608b9977 PA |
1185 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
1186 | { | |
608b9977 | 1187 | struct tun_struct *tun = netdev_priv(dev); |
608b9977 | 1188 | |
497a5757 | 1189 | dev_get_tstats64(dev, stats); |
608b9977 | 1190 | |
497a5757 HK |
1191 | stats->rx_frame_errors += |
1192 | (unsigned long)atomic_long_read(&tun->rx_frame_errors); | |
608b9977 PA |
1193 | } |
1194 | ||
761876c8 JW |
1195 | static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1196 | struct netlink_ext_ack *extack) | |
1197 | { | |
1198 | struct tun_struct *tun = netdev_priv(dev); | |
e4a2a304 | 1199 | struct tun_file *tfile; |
761876c8 | 1200 | struct bpf_prog *old_prog; |
e4a2a304 | 1201 | int i; |
761876c8 JW |
1202 | |
1203 | old_prog = rtnl_dereference(tun->xdp_prog); | |
1204 | rcu_assign_pointer(tun->xdp_prog, prog); | |
1205 | if (old_prog) | |
1206 | bpf_prog_put(old_prog); | |
1207 | ||
e4a2a304 JW |
1208 | for (i = 0; i < tun->numqueues; i++) { |
1209 | tfile = rtnl_dereference(tun->tfiles[i]); | |
1210 | if (prog) | |
1211 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1212 | else | |
1213 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1214 | } | |
1215 | list_for_each_entry(tfile, &tun->disabled, next) { | |
1216 | if (prog) | |
1217 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1218 | else | |
1219 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1220 | } | |
1221 | ||
761876c8 JW |
1222 | return 0; |
1223 | } | |
1224 | ||
f4e63525 | 1225 | static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
761876c8 JW |
1226 | { |
1227 | switch (xdp->command) { | |
1228 | case XDP_SETUP_PROG: | |
1229 | return tun_xdp_set(dev, xdp->prog, xdp->extack); | |
761876c8 JW |
1230 | default: |
1231 | return -EINVAL; | |
1232 | } | |
1233 | } | |
1234 | ||
26d31925 ND |
1235 | static int tun_net_change_carrier(struct net_device *dev, bool new_carrier) |
1236 | { | |
1237 | if (new_carrier) { | |
1238 | struct tun_struct *tun = netdev_priv(dev); | |
1239 | ||
1240 | if (!tun->numqueues) | |
1241 | return -EPERM; | |
1242 | ||
1243 | netif_carrier_on(dev); | |
1244 | } else { | |
1245 | netif_carrier_off(dev); | |
1246 | } | |
1247 | return 0; | |
1248 | } | |
1249 | ||
758e43b7 | 1250 | static const struct net_device_ops tun_netdev_ops = { |
158b515f | 1251 | .ndo_init = tun_net_init, |
c70f1829 | 1252 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1253 | .ndo_open = tun_net_open, |
1254 | .ndo_stop = tun_net_close, | |
00829823 | 1255 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1256 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 1257 | .ndo_select_queue = tun_select_queue, |
eaea34b2 | 1258 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1259 | .ndo_get_stats64 = tun_net_get_stats64, |
26d31925 | 1260 | .ndo_change_carrier = tun_net_change_carrier, |
758e43b7 SH |
1261 | }; |
1262 | ||
0c9d917b JDB |
1263 | static void __tun_xdp_flush_tfile(struct tun_file *tfile) |
1264 | { | |
1265 | /* Notify and wake up reader process */ | |
1266 | if (tfile->flags & TUN_FASYNC) | |
1267 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
1268 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); | |
1269 | } | |
1270 | ||
42b33468 JDB |
1271 | static int tun_xdp_xmit(struct net_device *dev, int n, |
1272 | struct xdp_frame **frames, u32 flags) | |
fc72d1d5 JW |
1273 | { |
1274 | struct tun_struct *tun = netdev_priv(dev); | |
fc72d1d5 JW |
1275 | struct tun_file *tfile; |
1276 | u32 numqueues; | |
fdc13979 | 1277 | int nxmit = 0; |
735fc405 | 1278 | int i; |
fc72d1d5 | 1279 | |
0c9d917b | 1280 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
42b33468 JDB |
1281 | return -EINVAL; |
1282 | ||
fc72d1d5 JW |
1283 | rcu_read_lock(); |
1284 | ||
9871a9e4 | 1285 | resample: |
fc72d1d5 JW |
1286 | numqueues = READ_ONCE(tun->numqueues); |
1287 | if (!numqueues) { | |
735fc405 JDB |
1288 | rcu_read_unlock(); |
1289 | return -ENXIO; /* Caller will free/return all frames */ | |
fc72d1d5 JW |
1290 | } |
1291 | ||
1292 | tfile = rcu_dereference(tun->tfiles[smp_processor_id() % | |
1293 | numqueues]); | |
9871a9e4 JW |
1294 | if (unlikely(!tfile)) |
1295 | goto resample; | |
735fc405 JDB |
1296 | |
1297 | spin_lock(&tfile->tx_ring.producer_lock); | |
1298 | for (i = 0; i < n; i++) { | |
1299 | struct xdp_frame *xdp = frames[i]; | |
1300 | /* Encode the XDP flag into lowest bit for consumer to differ | |
1301 | * XDP buffer from sk_buff. | |
1302 | */ | |
1303 | void *frame = tun_xdp_to_ptr(xdp); | |
1304 | ||
1305 | if (__ptr_ring_produce(&tfile->tx_ring, frame)) { | |
625788b5 | 1306 | dev_core_stats_tx_dropped_inc(dev); |
fdc13979 | 1307 | break; |
735fc405 | 1308 | } |
fdc13979 | 1309 | nxmit++; |
fc72d1d5 | 1310 | } |
735fc405 | 1311 | spin_unlock(&tfile->tx_ring.producer_lock); |
fc72d1d5 | 1312 | |
0c9d917b JDB |
1313 | if (flags & XDP_XMIT_FLUSH) |
1314 | __tun_xdp_flush_tfile(tfile); | |
1315 | ||
fc72d1d5 | 1316 | rcu_read_unlock(); |
fdc13979 | 1317 | return nxmit; |
fc72d1d5 JW |
1318 | } |
1319 | ||
44fa2dbd JDB |
1320 | static int tun_xdp_tx(struct net_device *dev, struct xdp_buff *xdp) |
1321 | { | |
1b698fa5 | 1322 | struct xdp_frame *frame = xdp_convert_buff_to_frame(xdp); |
fdc13979 | 1323 | int nxmit; |
44fa2dbd JDB |
1324 | |
1325 | if (unlikely(!frame)) | |
1326 | return -EOVERFLOW; | |
1327 | ||
fdc13979 LB |
1328 | nxmit = tun_xdp_xmit(dev, 1, &frame, XDP_XMIT_FLUSH); |
1329 | if (!nxmit) | |
1330 | xdp_return_frame_rx_napi(frame); | |
1331 | return nxmit; | |
fc72d1d5 JW |
1332 | } |
1333 | ||
758e43b7 | 1334 | static const struct net_device_ops tap_netdev_ops = { |
158b515f | 1335 | .ndo_init = tun_net_init, |
c70f1829 | 1336 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1337 | .ndo_open = tun_net_open, |
1338 | .ndo_stop = tun_net_close, | |
00829823 | 1339 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1340 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 1341 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
1342 | .ndo_set_mac_address = eth_mac_addr, |
1343 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 1344 | .ndo_select_queue = tun_select_queue, |
5e52796a | 1345 | .ndo_features_check = passthru_features_check, |
eaea34b2 | 1346 | .ndo_set_rx_headroom = tun_set_headroom, |
497a5757 | 1347 | .ndo_get_stats64 = dev_get_tstats64, |
f4e63525 | 1348 | .ndo_bpf = tun_xdp, |
fc72d1d5 | 1349 | .ndo_xdp_xmit = tun_xdp_xmit, |
26d31925 | 1350 | .ndo_change_carrier = tun_net_change_carrier, |
758e43b7 SH |
1351 | }; |
1352 | ||
944a1376 | 1353 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
1354 | { |
1355 | int i; | |
1356 | ||
96442e42 JW |
1357 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
1358 | INIT_HLIST_HEAD(&tun->flows[i]); | |
1359 | ||
1360 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
e99e88a9 KC |
1361 | timer_setup(&tun->flow_gc_timer, tun_flow_cleanup, 0); |
1362 | mod_timer(&tun->flow_gc_timer, | |
1363 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
1364 | } |
1365 | ||
1366 | static void tun_flow_uninit(struct tun_struct *tun) | |
1367 | { | |
1368 | del_timer_sync(&tun->flow_gc_timer); | |
1369 | tun_flow_flush(tun); | |
96442e42 JW |
1370 | } |
1371 | ||
91572088 JW |
1372 | #define MIN_MTU 68 |
1373 | #define MAX_MTU 65535 | |
1374 | ||
1da177e4 | 1375 | /* Initialize net device. */ |
158b515f | 1376 | static void tun_net_initialize(struct net_device *dev) |
1da177e4 LT |
1377 | { |
1378 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 1379 | |
1da177e4 | 1380 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 1381 | case IFF_TUN: |
758e43b7 | 1382 | dev->netdev_ops = &tun_netdev_ops; |
b9815eb1 | 1383 | dev->header_ops = &ip_tunnel_header_ops; |
758e43b7 | 1384 | |
1da177e4 LT |
1385 | /* Point-to-Point TUN Device */ |
1386 | dev->hard_header_len = 0; | |
1387 | dev->addr_len = 0; | |
1388 | dev->mtu = 1500; | |
1389 | ||
1390 | /* Zero header length */ | |
6aa20a22 | 1391 | dev->type = ARPHRD_NONE; |
1da177e4 | 1392 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
1da177e4 LT |
1393 | break; |
1394 | ||
40630b82 | 1395 | case IFF_TAP: |
7a0a9608 | 1396 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 1397 | /* Ethernet TAP Device */ |
1da177e4 | 1398 | ether_setup(dev); |
550fd08c | 1399 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 1400 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 1401 | |
f2cedb63 | 1402 | eth_hw_addr_random(dev); |
36226a8d | 1403 | |
66c0e13a MM |
1404 | /* Currently tun does not support XDP, only tap does. */ |
1405 | dev->xdp_features = NETDEV_XDP_ACT_BASIC | | |
1406 | NETDEV_XDP_ACT_REDIRECT | | |
1407 | NETDEV_XDP_ACT_NDO_XMIT; | |
1408 | ||
1da177e4 LT |
1409 | break; |
1410 | } | |
91572088 JW |
1411 | |
1412 | dev->min_mtu = MIN_MTU; | |
1413 | dev->max_mtu = MAX_MTU - dev->hard_header_len; | |
1da177e4 LT |
1414 | } |
1415 | ||
2f3ab622 JW |
1416 | static bool tun_sock_writeable(struct tun_struct *tun, struct tun_file *tfile) |
1417 | { | |
1418 | struct sock *sk = tfile->socket.sk; | |
1419 | ||
1420 | return (tun->dev->flags & IFF_UP) && sock_writeable(sk); | |
1421 | } | |
1422 | ||
1da177e4 LT |
1423 | /* Character device part */ |
1424 | ||
1425 | /* Poll */ | |
afc9a42b | 1426 | static __poll_t tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 1427 | { |
b2430de3 | 1428 | struct tun_file *tfile = file->private_data; |
9484dc74 | 1429 | struct tun_struct *tun = tun_get(tfile); |
3c8a9c63 | 1430 | struct sock *sk; |
afc9a42b | 1431 | __poll_t mask = 0; |
1da177e4 LT |
1432 | |
1433 | if (!tun) | |
a9a08845 | 1434 | return EPOLLERR; |
1da177e4 | 1435 | |
54f968d6 | 1436 | sk = tfile->socket.sk; |
3c8a9c63 | 1437 | |
9e641bdc | 1438 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 1439 | |
5990a305 | 1440 | if (!ptr_ring_empty(&tfile->tx_ring)) |
a9a08845 | 1441 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 | 1442 | |
2f3ab622 JW |
1443 | /* Make sure SOCKWQ_ASYNC_NOSPACE is set if not writable to |
1444 | * guarantee EPOLLOUT to be raised by either here or | |
1445 | * tun_sock_write_space(). Then process could get notification | |
1446 | * after it writes to a down device and meets -EIO. | |
1447 | */ | |
1448 | if (tun_sock_writeable(tun, tfile) || | |
1449 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
1450 | tun_sock_writeable(tun, tfile))) | |
a9a08845 | 1451 | mask |= EPOLLOUT | EPOLLWRNORM; |
33dccbb0 | 1452 | |
c70f1829 | 1453 | if (tun->dev->reg_state != NETREG_REGISTERED) |
a9a08845 | 1454 | mask = EPOLLERR; |
c70f1829 | 1455 | |
631ab46b | 1456 | tun_put(tun); |
1da177e4 LT |
1457 | return mask; |
1458 | } | |
1459 | ||
90e33d45 PP |
1460 | static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile, |
1461 | size_t len, | |
1462 | const struct iov_iter *it) | |
1463 | { | |
1464 | struct sk_buff *skb; | |
1465 | size_t linear; | |
1466 | int err; | |
1467 | int i; | |
1468 | ||
363a5328 ZX |
1469 | if (it->nr_segs > MAX_SKB_FRAGS + 1 || |
1470 | len > (ETH_MAX_MTU - NET_SKB_PAD - NET_IP_ALIGN)) | |
950271d7 | 1471 | return ERR_PTR(-EMSGSIZE); |
90e33d45 PP |
1472 | |
1473 | local_bh_disable(); | |
1474 | skb = napi_get_frags(&tfile->napi); | |
1475 | local_bh_enable(); | |
1476 | if (!skb) | |
1477 | return ERR_PTR(-ENOMEM); | |
1478 | ||
1479 | linear = iov_iter_single_seg_count(it); | |
1480 | err = __skb_grow(skb, linear); | |
1481 | if (err) | |
1482 | goto free; | |
1483 | ||
1484 | skb->len = len; | |
1485 | skb->data_len = len - linear; | |
1486 | skb->truesize += skb->data_len; | |
1487 | ||
1488 | for (i = 1; i < it->nr_segs; i++) { | |
de4f5fed JA |
1489 | const struct iovec *iov = iter_iov(it); |
1490 | size_t fragsz = iov->iov_len; | |
aa6daaca ED |
1491 | struct page *page; |
1492 | void *frag; | |
90e33d45 PP |
1493 | |
1494 | if (fragsz == 0 || fragsz > PAGE_SIZE) { | |
1495 | err = -EINVAL; | |
1496 | goto free; | |
1497 | } | |
aa6daaca ED |
1498 | frag = netdev_alloc_frag(fragsz); |
1499 | if (!frag) { | |
90e33d45 PP |
1500 | err = -ENOMEM; |
1501 | goto free; | |
1502 | } | |
aa6daaca ED |
1503 | page = virt_to_head_page(frag); |
1504 | skb_fill_page_desc(skb, i - 1, page, | |
1505 | frag - page_address(page), fragsz); | |
90e33d45 PP |
1506 | } |
1507 | ||
1508 | return skb; | |
1509 | free: | |
1510 | /* frees skb and all frags allocated with napi_alloc_frag() */ | |
1511 | napi_free_frags(&tfile->napi); | |
1512 | return ERR_PTR(err); | |
1513 | } | |
1514 | ||
f42157cb RR |
1515 | /* prepad is the amount to reserve at front. len is length after that. |
1516 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1517 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1518 | size_t prepad, size_t len, |
1519 | size_t linear, int noblock) | |
f42157cb | 1520 | { |
54f968d6 | 1521 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1522 | struct sk_buff *skb; |
33dccbb0 | 1523 | int err; |
f42157cb RR |
1524 | |
1525 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1526 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1527 | linear = len; |
f42157cb | 1528 | |
33dccbb0 | 1529 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1530 | &err, 0); |
f42157cb | 1531 | if (!skb) |
33dccbb0 | 1532 | return ERR_PTR(err); |
f42157cb RR |
1533 | |
1534 | skb_reserve(skb, prepad); | |
1535 | skb_put(skb, linear); | |
33dccbb0 HX |
1536 | skb->data_len = len - linear; |
1537 | skb->len += len - linear; | |
f42157cb RR |
1538 | |
1539 | return skb; | |
1540 | } | |
1541 | ||
5503fcec JW |
1542 | static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile, |
1543 | struct sk_buff *skb, int more) | |
1544 | { | |
1545 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
1546 | struct sk_buff_head process_queue; | |
1547 | u32 rx_batched = tun->rx_batched; | |
1548 | bool rcv = false; | |
1549 | ||
1550 | if (!rx_batched || (!more && skb_queue_empty(queue))) { | |
1551 | local_bh_disable(); | |
8ebebcba | 1552 | skb_record_rx_queue(skb, tfile->queue_index); |
5503fcec JW |
1553 | netif_receive_skb(skb); |
1554 | local_bh_enable(); | |
1555 | return; | |
1556 | } | |
1557 | ||
1558 | spin_lock(&queue->lock); | |
1559 | if (!more || skb_queue_len(queue) == rx_batched) { | |
1560 | __skb_queue_head_init(&process_queue); | |
1561 | skb_queue_splice_tail_init(queue, &process_queue); | |
1562 | rcv = true; | |
1563 | } else { | |
1564 | __skb_queue_tail(queue, skb); | |
1565 | } | |
1566 | spin_unlock(&queue->lock); | |
1567 | ||
1568 | if (rcv) { | |
1569 | struct sk_buff *nskb; | |
1570 | ||
1571 | local_bh_disable(); | |
8ebebcba MC |
1572 | while ((nskb = __skb_dequeue(&process_queue))) { |
1573 | skb_record_rx_queue(nskb, tfile->queue_index); | |
5503fcec | 1574 | netif_receive_skb(nskb); |
8ebebcba MC |
1575 | } |
1576 | skb_record_rx_queue(skb, tfile->queue_index); | |
5503fcec JW |
1577 | netif_receive_skb(skb); |
1578 | local_bh_enable(); | |
1579 | } | |
1580 | } | |
1581 | ||
66ccbc9c JW |
1582 | static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, |
1583 | int len, int noblock, bool zerocopy) | |
1584 | { | |
1585 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) | |
1586 | return false; | |
1587 | ||
1588 | if (tfile->socket.sk->sk_sndbuf != INT_MAX) | |
1589 | return false; | |
1590 | ||
1591 | if (!noblock) | |
1592 | return false; | |
1593 | ||
1594 | if (zerocopy) | |
1595 | return false; | |
1596 | ||
1597 | if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + | |
1598 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
1599 | return false; | |
1600 | ||
1601 | return true; | |
1602 | } | |
1603 | ||
4b663366 AB |
1604 | static struct sk_buff *__tun_build_skb(struct tun_file *tfile, |
1605 | struct page_frag *alloc_frag, char *buf, | |
8ae1aff0 | 1606 | int buflen, int len, int pad) |
ac1f1f6c JW |
1607 | { |
1608 | struct sk_buff *skb = build_skb(buf, buflen); | |
1609 | ||
1610 | if (!skb) | |
1611 | return ERR_PTR(-ENOMEM); | |
1612 | ||
8ae1aff0 | 1613 | skb_reserve(skb, pad); |
ac1f1f6c | 1614 | skb_put(skb, len); |
4b663366 | 1615 | skb_set_owner_w(skb, tfile->socket.sk); |
ac1f1f6c JW |
1616 | |
1617 | get_page(alloc_frag->page); | |
1618 | alloc_frag->offset += buflen; | |
1619 | ||
1620 | return skb; | |
1621 | } | |
1622 | ||
8ae1aff0 JW |
1623 | static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog, |
1624 | struct xdp_buff *xdp, u32 act) | |
1625 | { | |
1626 | int err; | |
1627 | ||
1628 | switch (act) { | |
1629 | case XDP_REDIRECT: | |
1630 | err = xdp_do_redirect(tun->dev, xdp, xdp_prog); | |
8ae1aff0 JW |
1631 | if (err) |
1632 | return err; | |
1633 | break; | |
1634 | case XDP_TX: | |
1635 | err = tun_xdp_tx(tun->dev, xdp); | |
1636 | if (err < 0) | |
1637 | return err; | |
1638 | break; | |
1639 | case XDP_PASS: | |
1640 | break; | |
1641 | default: | |
c8064e5b | 1642 | bpf_warn_invalid_xdp_action(tun->dev, xdp_prog, act); |
df561f66 | 1643 | fallthrough; |
8ae1aff0 JW |
1644 | case XDP_ABORTED: |
1645 | trace_xdp_exception(tun->dev, xdp_prog, act); | |
df561f66 | 1646 | fallthrough; |
8ae1aff0 | 1647 | case XDP_DROP: |
625788b5 | 1648 | dev_core_stats_rx_dropped_inc(tun->dev); |
8ae1aff0 JW |
1649 | break; |
1650 | } | |
1651 | ||
1652 | return act; | |
1653 | } | |
1654 | ||
761876c8 JW |
1655 | static struct sk_buff *tun_build_skb(struct tun_struct *tun, |
1656 | struct tun_file *tfile, | |
66ccbc9c | 1657 | struct iov_iter *from, |
761876c8 | 1658 | struct virtio_net_hdr *hdr, |
1cfe6e93 | 1659 | int len, int *skb_xdp) |
66ccbc9c | 1660 | { |
0bbd7dad | 1661 | struct page_frag *alloc_frag = ¤t->task_frag; |
761876c8 | 1662 | struct bpf_prog *xdp_prog; |
7df13219 | 1663 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
66ccbc9c JW |
1664 | char *buf; |
1665 | size_t copied; | |
8ae1aff0 JW |
1666 | int pad = TUN_RX_PAD; |
1667 | int err = 0; | |
7df13219 JW |
1668 | |
1669 | rcu_read_lock(); | |
1670 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1671 | if (xdp_prog) | |
4f23aff8 | 1672 | pad += XDP_PACKET_HEADROOM; |
7df13219 JW |
1673 | buflen += SKB_DATA_ALIGN(len + pad); |
1674 | rcu_read_unlock(); | |
66ccbc9c | 1675 | |
63b9ab65 | 1676 | alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); |
66ccbc9c JW |
1677 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) |
1678 | return ERR_PTR(-ENOMEM); | |
1679 | ||
1680 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
1681 | copied = copy_page_from_iter(alloc_frag->page, | |
7df13219 | 1682 | alloc_frag->offset + pad, |
66ccbc9c JW |
1683 | len, from); |
1684 | if (copied != len) | |
1685 | return ERR_PTR(-EFAULT); | |
1686 | ||
7df13219 JW |
1687 | /* There's a small window that XDP may be set after the check |
1688 | * of xdp_prog above, this should be rare and for simplicity | |
1689 | * we do XDP on skb in case the headroom is not enough. | |
1690 | */ | |
ac1f1f6c | 1691 | if (hdr->gso_type || !xdp_prog) { |
1cfe6e93 | 1692 | *skb_xdp = 1; |
4b663366 AB |
1693 | return __tun_build_skb(tfile, alloc_frag, buf, buflen, len, |
1694 | pad); | |
ac1f1f6c JW |
1695 | } |
1696 | ||
1697 | *skb_xdp = 0; | |
761876c8 | 1698 | |
6547e387 | 1699 | local_bh_disable(); |
761876c8 JW |
1700 | rcu_read_lock(); |
1701 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
8ae1aff0 | 1702 | if (xdp_prog) { |
761876c8 | 1703 | struct xdp_buff xdp; |
761876c8 JW |
1704 | u32 act; |
1705 | ||
43b5169d | 1706 | xdp_init_buff(&xdp, buflen, &tfile->xdp_rxq); |
be9df4af | 1707 | xdp_prepare_buff(&xdp, buf, pad, len, false); |
761876c8 | 1708 | |
8ae1aff0 JW |
1709 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
1710 | if (act == XDP_REDIRECT || act == XDP_TX) { | |
59655a5b JW |
1711 | get_page(alloc_frag->page); |
1712 | alloc_frag->offset += buflen; | |
761876c8 | 1713 | } |
8ae1aff0 | 1714 | err = tun_xdp_act(tun, xdp_prog, &xdp, act); |
bee34890 WD |
1715 | if (err < 0) { |
1716 | if (act == XDP_REDIRECT || act == XDP_TX) | |
1717 | put_page(alloc_frag->page); | |
1718 | goto out; | |
1719 | } | |
1720 | ||
1a097910 | 1721 | if (err == XDP_REDIRECT) |
1d233886 | 1722 | xdp_do_flush(); |
8ae1aff0 JW |
1723 | if (err != XDP_PASS) |
1724 | goto out; | |
1725 | ||
1726 | pad = xdp.data - xdp.data_hard_start; | |
1727 | len = xdp.data_end - xdp.data; | |
761876c8 | 1728 | } |
291aeb2b JW |
1729 | rcu_read_unlock(); |
1730 | local_bh_enable(); | |
761876c8 | 1731 | |
4b663366 | 1732 | return __tun_build_skb(tfile, alloc_frag, buf, buflen, len, pad); |
761876c8 | 1733 | |
f7053b6c | 1734 | out: |
761876c8 | 1735 | rcu_read_unlock(); |
6547e387 | 1736 | local_bh_enable(); |
761876c8 | 1737 | return NULL; |
66ccbc9c JW |
1738 | } |
1739 | ||
1da177e4 | 1740 | /* Get packet from user space buffer */ |
54f968d6 | 1741 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 | 1742 | void *msg_control, struct iov_iter *from, |
5503fcec | 1743 | int noblock, bool more) |
1da177e4 | 1744 | { |
09640e63 | 1745 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1746 | struct sk_buff *skb; |
f5ff53b4 | 1747 | size_t total_len = iov_iter_count(from); |
eaea34b2 | 1748 | size_t len = total_len, align = tun->align, linear; |
f43798c2 | 1749 | struct virtio_net_hdr gso = { 0 }; |
96f8d9ec | 1750 | int good_linear; |
0690899b MT |
1751 | int copylen; |
1752 | bool zerocopy = false; | |
1753 | int err; | |
96f84061 | 1754 | u32 rxhash = 0; |
1cfe6e93 | 1755 | int skb_xdp = 1; |
af3fb24e | 1756 | bool frags = tun_napi_frags_enabled(tfile); |
ab00af85 | 1757 | enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; |
1da177e4 | 1758 | |
40630b82 | 1759 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1760 | if (len < sizeof(pi)) |
1da177e4 | 1761 | return -EINVAL; |
15718ea0 | 1762 | len -= sizeof(pi); |
1da177e4 | 1763 | |
cbbd26b8 | 1764 | if (!copy_from_iter_full(&pi, sizeof(pi), from)) |
1da177e4 LT |
1765 | return -EFAULT; |
1766 | } | |
1767 | ||
40630b82 | 1768 | if (tun->flags & IFF_VNET_HDR) { |
e1edab87 WB |
1769 | int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1770 | ||
1771 | if (len < vnet_hdr_sz) | |
f43798c2 | 1772 | return -EINVAL; |
e1edab87 | 1773 | len -= vnet_hdr_sz; |
f43798c2 | 1774 | |
cbbd26b8 | 1775 | if (!copy_from_iter_full(&gso, sizeof(gso), from)) |
f43798c2 RR |
1776 | return -EFAULT; |
1777 | ||
4909122f | 1778 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1779 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1780 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1781 | |
56f0dcc5 | 1782 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1783 | return -EINVAL; |
e1edab87 | 1784 | iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1785 | } |
1786 | ||
40630b82 | 1787 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1788 | align += NET_IP_ALIGN; |
0eca93bc | 1789 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1790 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1791 | return -EINVAL; |
1792 | } | |
6aa20a22 | 1793 | |
96f8d9ec JW |
1794 | good_linear = SKB_MAX_HEAD(align); |
1795 | ||
88529176 | 1796 | if (msg_control) { |
f5ff53b4 AV |
1797 | struct iov_iter i = *from; |
1798 | ||
88529176 JW |
1799 | /* There are 256 bytes to be copied in skb, so there is |
1800 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1801 | * The rest of the buffer is mapped from userspace. |
1802 | */ | |
56f0dcc5 | 1803 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1804 | if (copylen > good_linear) |
1805 | copylen = good_linear; | |
3dd5c330 | 1806 | linear = copylen; |
f5ff53b4 AV |
1807 | iov_iter_advance(&i, copylen); |
1808 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1809 | zerocopy = true; |
1810 | } | |
1811 | ||
90e33d45 | 1812 | if (!frags && tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) { |
1cfe6e93 JW |
1813 | /* For the packet that is not easy to be processed |
1814 | * (e.g gso or jumbo packet), we will do it at after | |
1815 | * skb was created with generic XDP routine. | |
1816 | */ | |
1817 | skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp); | |
ab00af85 CW |
1818 | err = PTR_ERR_OR_ZERO(skb); |
1819 | if (err) | |
1820 | goto drop; | |
761876c8 JW |
1821 | if (!skb) |
1822 | return total_len; | |
66ccbc9c JW |
1823 | } else { |
1824 | if (!zerocopy) { | |
1825 | copylen = len; | |
1826 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) | |
1827 | linear = good_linear; | |
1828 | else | |
1829 | linear = tun16_to_cpu(tun, gso.hdr_len); | |
1830 | } | |
1da177e4 | 1831 | |
90e33d45 PP |
1832 | if (frags) { |
1833 | mutex_lock(&tfile->napi_mutex); | |
1834 | skb = tun_napi_alloc_frags(tfile, copylen, from); | |
1835 | /* tun_napi_alloc_frags() enforces a layout for the skb. | |
1836 | * If zerocopy is enabled, then this layout will be | |
1837 | * overwritten by zerocopy_sg_from_iter(). | |
1838 | */ | |
1839 | zerocopy = false; | |
1840 | } else { | |
1841 | skb = tun_alloc_skb(tfile, align, copylen, linear, | |
1842 | noblock); | |
1843 | } | |
1844 | ||
ab00af85 CW |
1845 | err = PTR_ERR_OR_ZERO(skb); |
1846 | if (err) | |
1847 | goto drop; | |
0690899b | 1848 | |
66ccbc9c JW |
1849 | if (zerocopy) |
1850 | err = zerocopy_sg_from_iter(skb, from); | |
1851 | else | |
1852 | err = skb_copy_datagram_from_iter(skb, 0, from, len); | |
1853 | ||
1854 | if (err) { | |
4477138f | 1855 | err = -EFAULT; |
4b4f052e | 1856 | drop_reason = SKB_DROP_REASON_SKB_UCOPY_FAULT; |
ab00af85 | 1857 | goto drop; |
66ccbc9c | 1858 | } |
8f22757e | 1859 | } |
1da177e4 | 1860 | |
3e9e40e7 | 1861 | if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { |
497a5757 | 1862 | atomic_long_inc(&tun->rx_frame_errors); |
ab00af85 CW |
1863 | err = -EINVAL; |
1864 | goto free_skb; | |
df10db98 PA |
1865 | } |
1866 | ||
1da177e4 | 1867 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1868 | case IFF_TUN: |
1869 | if (tun->flags & IFF_NO_PI) { | |
2580c4c1 AP |
1870 | u8 ip_version = skb->len ? (skb->data[0] >> 4) : 0; |
1871 | ||
1872 | switch (ip_version) { | |
1873 | case 4: | |
f09f7ee2 AWC |
1874 | pi.proto = htons(ETH_P_IP); |
1875 | break; | |
2580c4c1 | 1876 | case 6: |
f09f7ee2 AWC |
1877 | pi.proto = htons(ETH_P_IPV6); |
1878 | break; | |
1879 | default: | |
ab00af85 CW |
1880 | err = -EINVAL; |
1881 | goto drop; | |
f09f7ee2 AWC |
1882 | } |
1883 | } | |
1884 | ||
459a98ed | 1885 | skb_reset_mac_header(skb); |
1da177e4 | 1886 | skb->protocol = pi.proto; |
4c13eb66 | 1887 | skb->dev = tun->dev; |
1da177e4 | 1888 | break; |
40630b82 | 1889 | case IFF_TAP: |
96aa1b22 WB |
1890 | if (frags && !pskb_may_pull(skb, ETH_HLEN)) { |
1891 | err = -ENOMEM; | |
4b4f052e | 1892 | drop_reason = SKB_DROP_REASON_HDR_TRUNC; |
96aa1b22 WB |
1893 | goto drop; |
1894 | } | |
1895 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1da177e4 | 1896 | break; |
6403eab1 | 1897 | } |
1da177e4 | 1898 | |
0690899b MT |
1899 | /* copy skb_ubuf_info for callback when skb has no error */ |
1900 | if (zerocopy) { | |
9ee5e5ad | 1901 | skb_zcopy_init(skb, msg_control); |
af1cc7a2 JW |
1902 | } else if (msg_control) { |
1903 | struct ubuf_info *uarg = msg_control; | |
36177832 | 1904 | uarg->callback(NULL, uarg, false); |
0690899b MT |
1905 | } |
1906 | ||
72f65107 | 1907 | skb_reset_network_header(skb); |
d2aa125d | 1908 | skb_probe_transport_header(skb); |
3fe260e0 | 1909 | skb_record_rx_queue(skb, tfile->queue_index); |
38502af7 | 1910 | |
1cfe6e93 | 1911 | if (skb_xdp) { |
761876c8 JW |
1912 | struct bpf_prog *xdp_prog; |
1913 | int ret; | |
1914 | ||
6547e387 | 1915 | local_bh_disable(); |
761876c8 JW |
1916 | rcu_read_lock(); |
1917 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1918 | if (xdp_prog) { | |
1919 | ret = do_xdp_generic(xdp_prog, skb); | |
1920 | if (ret != XDP_PASS) { | |
1921 | rcu_read_unlock(); | |
6547e387 | 1922 | local_bh_enable(); |
ab00af85 | 1923 | goto unlock_frags; |
761876c8 JW |
1924 | } |
1925 | } | |
1926 | rcu_read_unlock(); | |
6547e387 | 1927 | local_bh_enable(); |
761876c8 JW |
1928 | } |
1929 | ||
cf1a1e07 PA |
1930 | /* Compute the costly rx hash only if needed for flow updates. |
1931 | * We may get a very small possibility of OOO during switching, not | |
1932 | * worth to optimize. | |
1933 | */ | |
1934 | if (!rcu_access_pointer(tun->steering_prog) && tun->numqueues > 1 && | |
1935 | !tfile->detached) | |
96f84061 | 1936 | rxhash = __skb_get_hash_symmetric(skb); |
94317099 | 1937 | |
4477138f ED |
1938 | rcu_read_lock(); |
1939 | if (unlikely(!(tun->dev->flags & IFF_UP))) { | |
1940 | err = -EIO; | |
9180bb4f | 1941 | rcu_read_unlock(); |
4b4f052e | 1942 | drop_reason = SKB_DROP_REASON_DEV_READY; |
4477138f ED |
1943 | goto drop; |
1944 | } | |
1945 | ||
90e33d45 | 1946 | if (frags) { |
96aa1b22 WB |
1947 | u32 headlen; |
1948 | ||
90e33d45 | 1949 | /* Exercise flow dissector code path. */ |
96aa1b22 WB |
1950 | skb_push(skb, ETH_HLEN); |
1951 | headlen = eth_get_headlen(tun->dev, skb->data, | |
1952 | skb_headlen(skb)); | |
90e33d45 | 1953 | |
010f245b | 1954 | if (unlikely(headlen > skb_headlen(skb))) { |
07d120aa ED |
1955 | WARN_ON_ONCE(1); |
1956 | err = -ENOMEM; | |
625788b5 | 1957 | dev_core_stats_rx_dropped_inc(tun->dev); |
07d120aa | 1958 | napi_busy: |
90e33d45 | 1959 | napi_free_frags(&tfile->napi); |
4477138f | 1960 | rcu_read_unlock(); |
90e33d45 | 1961 | mutex_unlock(&tfile->napi_mutex); |
07d120aa | 1962 | return err; |
90e33d45 PP |
1963 | } |
1964 | ||
07d120aa ED |
1965 | if (likely(napi_schedule_prep(&tfile->napi))) { |
1966 | local_bh_disable(); | |
1967 | napi_gro_frags(&tfile->napi); | |
1968 | napi_complete(&tfile->napi); | |
1969 | local_bh_enable(); | |
1970 | } else { | |
1971 | err = -EBUSY; | |
1972 | goto napi_busy; | |
1973 | } | |
90e33d45 | 1974 | mutex_unlock(&tfile->napi_mutex); |
aec72f33 | 1975 | } else if (tfile->napi_enabled) { |
94317099 PP |
1976 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; |
1977 | int queue_len; | |
1978 | ||
1979 | spin_lock_bh(&queue->lock); | |
82b2bc27 KI |
1980 | |
1981 | if (unlikely(tfile->detached)) { | |
1982 | spin_unlock_bh(&queue->lock); | |
1983 | rcu_read_unlock(); | |
1984 | err = -EBUSY; | |
1985 | goto free_skb; | |
1986 | } | |
1987 | ||
94317099 PP |
1988 | __skb_queue_tail(queue, skb); |
1989 | queue_len = skb_queue_len(queue); | |
1990 | spin_unlock(&queue->lock); | |
1991 | ||
1992 | if (!more || queue_len > NAPI_POLL_WEIGHT) | |
1993 | napi_schedule(&tfile->napi); | |
1994 | ||
1995 | local_bh_enable(); | |
1996 | } else if (!IS_ENABLED(CONFIG_4KSTACKS)) { | |
1997 | tun_rx_batched(tun, tfile, skb, more); | |
1998 | } else { | |
3d391f65 | 1999 | netif_rx(skb); |
94317099 | 2000 | } |
4477138f | 2001 | rcu_read_unlock(); |
6aa20a22 | 2002 | |
497a5757 HK |
2003 | preempt_disable(); |
2004 | dev_sw_netstats_rx_add(tun->dev, len); | |
2005 | preempt_enable(); | |
1da177e4 | 2006 | |
96f84061 JW |
2007 | if (rxhash) |
2008 | tun_flow_update(tun, rxhash, tfile); | |
2009 | ||
0690899b | 2010 | return total_len; |
ab00af85 CW |
2011 | |
2012 | drop: | |
2013 | if (err != -EAGAIN) | |
2014 | dev_core_stats_rx_dropped_inc(tun->dev); | |
2015 | ||
2016 | free_skb: | |
2017 | if (!IS_ERR_OR_NULL(skb)) | |
2018 | kfree_skb_reason(skb, drop_reason); | |
2019 | ||
2020 | unlock_frags: | |
2021 | if (frags) { | |
2022 | tfile->napi.skb = NULL; | |
2023 | mutex_unlock(&tfile->napi_mutex); | |
2024 | } | |
2025 | ||
2026 | return err ?: total_len; | |
6aa20a22 | 2027 | } |
1da177e4 | 2028 | |
f5ff53b4 | 2029 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 2030 | { |
33dccbb0 | 2031 | struct file *file = iocb->ki_filp; |
54f968d6 | 2032 | struct tun_file *tfile = file->private_data; |
9484dc74 | 2033 | struct tun_struct *tun = tun_get(tfile); |
631ab46b | 2034 | ssize_t result; |
5aac0390 | 2035 | int noblock = 0; |
1da177e4 LT |
2036 | |
2037 | if (!tun) | |
2038 | return -EBADFD; | |
2039 | ||
5aac0390 JA |
2040 | if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) |
2041 | noblock = 1; | |
2042 | ||
2043 | result = tun_get_user(tun, tfile, NULL, from, noblock, false); | |
631ab46b EB |
2044 | |
2045 | tun_put(tun); | |
2046 | return result; | |
1da177e4 LT |
2047 | } |
2048 | ||
fc72d1d5 JW |
2049 | static ssize_t tun_put_user_xdp(struct tun_struct *tun, |
2050 | struct tun_file *tfile, | |
1ffcbc85 | 2051 | struct xdp_frame *xdp_frame, |
fc72d1d5 JW |
2052 | struct iov_iter *iter) |
2053 | { | |
2054 | int vnet_hdr_sz = 0; | |
1ffcbc85 | 2055 | size_t size = xdp_frame->len; |
fc72d1d5 JW |
2056 | size_t ret; |
2057 | ||
2058 | if (tun->flags & IFF_VNET_HDR) { | |
2059 | struct virtio_net_hdr gso = { 0 }; | |
2060 | ||
2061 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); | |
2062 | if (unlikely(iov_iter_count(iter) < vnet_hdr_sz)) | |
2063 | return -EINVAL; | |
2064 | if (unlikely(copy_to_iter(&gso, sizeof(gso), iter) != | |
2065 | sizeof(gso))) | |
2066 | return -EFAULT; | |
2067 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
2068 | } | |
2069 | ||
1ffcbc85 | 2070 | ret = copy_to_iter(xdp_frame->data, size, iter) + vnet_hdr_sz; |
fc72d1d5 | 2071 | |
497a5757 HK |
2072 | preempt_disable(); |
2073 | dev_sw_netstats_tx_add(tun->dev, 1, ret); | |
2074 | preempt_enable(); | |
fc72d1d5 JW |
2075 | |
2076 | return ret; | |
2077 | } | |
2078 | ||
1da177e4 | 2079 | /* Put packet to the user space buffer */ |
6f7c156c | 2080 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 2081 | struct tun_file *tfile, |
6f7c156c | 2082 | struct sk_buff *skb, |
e0b46d0e | 2083 | struct iov_iter *iter) |
1da177e4 LT |
2084 | { |
2085 | struct tun_pi pi = { 0, skb->protocol }; | |
e0b46d0e | 2086 | ssize_t total; |
8c847d25 | 2087 | int vlan_offset = 0; |
a8f9bfdf | 2088 | int vlan_hlen = 0; |
2eb783c4 | 2089 | int vnet_hdr_sz = 0; |
a8f9bfdf | 2090 | |
df8a39de | 2091 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 2092 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 2093 | |
40630b82 | 2094 | if (tun->flags & IFF_VNET_HDR) |
e1edab87 | 2095 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1da177e4 | 2096 | |
e0b46d0e HX |
2097 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
2098 | ||
40630b82 | 2099 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 2100 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
2101 | return -EINVAL; |
2102 | ||
e0b46d0e HX |
2103 | total += sizeof(pi); |
2104 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
2105 | /* Packet will be striped */ |
2106 | pi.flags |= TUN_PKT_STRIP; | |
2107 | } | |
6aa20a22 | 2108 | |
e0b46d0e | 2109 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 2110 | return -EFAULT; |
6aa20a22 | 2111 | } |
1da177e4 | 2112 | |
2eb783c4 | 2113 | if (vnet_hdr_sz) { |
9403cd7c | 2114 | struct virtio_net_hdr gso; |
34166093 | 2115 | |
e0b46d0e | 2116 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
2117 | return -EINVAL; |
2118 | ||
3e9e40e7 | 2119 | if (virtio_net_hdr_from_skb(skb, &gso, |
fd3a8862 WB |
2120 | tun_is_little_endian(tun), true, |
2121 | vlan_hlen)) { | |
f43798c2 | 2122 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
34166093 MR |
2123 | pr_err("unexpected GSO type: " |
2124 | "0x%x, gso_size %d, hdr_len %d\n", | |
2125 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), | |
2126 | tun16_to_cpu(tun, gso.hdr_len)); | |
2127 | print_hex_dump(KERN_ERR, "tun: ", | |
2128 | DUMP_PREFIX_NONE, | |
2129 | 16, 1, skb->head, | |
2130 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); | |
2131 | WARN_ON_ONCE(1); | |
2132 | return -EINVAL; | |
2133 | } | |
f43798c2 | 2134 | |
e0b46d0e | 2135 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 2136 | return -EFAULT; |
8c847d25 JW |
2137 | |
2138 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
2139 | } |
2140 | ||
a8f9bfdf | 2141 | if (vlan_hlen) { |
e0b46d0e | 2142 | int ret; |
aff3d70a | 2143 | struct veth veth; |
6680ec68 JW |
2144 | |
2145 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 2146 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
2147 | |
2148 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 2149 | |
e0b46d0e HX |
2150 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
2151 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
2152 | goto done; |
2153 | ||
e0b46d0e HX |
2154 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
2155 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
2156 | goto done; |
2157 | } | |
1da177e4 | 2158 | |
e0b46d0e | 2159 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 2160 | |
6680ec68 | 2161 | done: |
608b9977 | 2162 | /* caller is in process context, */ |
497a5757 HK |
2163 | preempt_disable(); |
2164 | dev_sw_netstats_tx_add(tun->dev, 1, skb->len + vlan_hlen); | |
2165 | preempt_enable(); | |
1da177e4 LT |
2166 | |
2167 | return total; | |
2168 | } | |
2169 | ||
fc72d1d5 | 2170 | static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err) |
1576d986 JW |
2171 | { |
2172 | DECLARE_WAITQUEUE(wait, current); | |
fc72d1d5 | 2173 | void *ptr = NULL; |
f48cc6b2 | 2174 | int error = 0; |
1576d986 | 2175 | |
fc72d1d5 JW |
2176 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2177 | if (ptr) | |
1576d986 JW |
2178 | goto out; |
2179 | if (noblock) { | |
f48cc6b2 | 2180 | error = -EAGAIN; |
1576d986 JW |
2181 | goto out; |
2182 | } | |
2183 | ||
333f7909 | 2184 | add_wait_queue(&tfile->socket.wq.wait, &wait); |
1576d986 JW |
2185 | |
2186 | while (1) { | |
71828b22 | 2187 | set_current_state(TASK_INTERRUPTIBLE); |
fc72d1d5 JW |
2188 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2189 | if (ptr) | |
1576d986 JW |
2190 | break; |
2191 | if (signal_pending(current)) { | |
f48cc6b2 | 2192 | error = -ERESTARTSYS; |
1576d986 JW |
2193 | break; |
2194 | } | |
2195 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { | |
f48cc6b2 | 2196 | error = -EFAULT; |
1576d986 JW |
2197 | break; |
2198 | } | |
2199 | ||
2200 | schedule(); | |
2201 | } | |
2202 | ||
ecef67cb | 2203 | __set_current_state(TASK_RUNNING); |
333f7909 | 2204 | remove_wait_queue(&tfile->socket.wq.wait, &wait); |
1576d986 JW |
2205 | |
2206 | out: | |
f48cc6b2 | 2207 | *err = error; |
fc72d1d5 | 2208 | return ptr; |
1576d986 JW |
2209 | } |
2210 | ||
54f968d6 | 2211 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 | 2212 | struct iov_iter *to, |
fc72d1d5 | 2213 | int noblock, void *ptr) |
1da177e4 | 2214 | { |
9b067034 | 2215 | ssize_t ret; |
1576d986 | 2216 | int err; |
1da177e4 | 2217 | |
c33ee15b | 2218 | if (!iov_iter_count(to)) { |
fc72d1d5 | 2219 | tun_ptr_free(ptr); |
9b067034 | 2220 | return 0; |
c33ee15b | 2221 | } |
1da177e4 | 2222 | |
fc72d1d5 | 2223 | if (!ptr) { |
ac77cfd4 | 2224 | /* Read frames from ring */ |
fc72d1d5 JW |
2225 | ptr = tun_ring_recv(tfile, noblock, &err); |
2226 | if (!ptr) | |
ac77cfd4 JW |
2227 | return err; |
2228 | } | |
e0b46d0e | 2229 | |
1ffcbc85 JDB |
2230 | if (tun_is_xdp_frame(ptr)) { |
2231 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2232 | |
1ffcbc85 | 2233 | ret = tun_put_user_xdp(tun, tfile, xdpf, to); |
03993094 | 2234 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
2235 | } else { |
2236 | struct sk_buff *skb = ptr; | |
2237 | ||
2238 | ret = tun_put_user(tun, tfile, skb, to); | |
2239 | if (unlikely(ret < 0)) | |
2240 | kfree_skb(skb); | |
2241 | else | |
2242 | consume_skb(skb); | |
2243 | } | |
1da177e4 | 2244 | |
05c2828c MT |
2245 | return ret; |
2246 | } | |
2247 | ||
9b067034 | 2248 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
2249 | { |
2250 | struct file *file = iocb->ki_filp; | |
2251 | struct tun_file *tfile = file->private_data; | |
9484dc74 | 2252 | struct tun_struct *tun = tun_get(tfile); |
9b067034 | 2253 | ssize_t len = iov_iter_count(to), ret; |
5aac0390 | 2254 | int noblock = 0; |
05c2828c MT |
2255 | |
2256 | if (!tun) | |
2257 | return -EBADFD; | |
5aac0390 JA |
2258 | |
2259 | if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) | |
2260 | noblock = 1; | |
2261 | ||
2262 | ret = tun_do_read(tun, tfile, to, noblock, NULL); | |
42404c09 | 2263 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
2264 | if (ret > 0) |
2265 | iocb->ki_pos = ret; | |
631ab46b | 2266 | tun_put(tun); |
1da177e4 LT |
2267 | return ret; |
2268 | } | |
2269 | ||
cd5681d7 | 2270 | static void tun_prog_free(struct rcu_head *rcu) |
96f84061 | 2271 | { |
cd5681d7 | 2272 | struct tun_prog *prog = container_of(rcu, struct tun_prog, rcu); |
96f84061 JW |
2273 | |
2274 | bpf_prog_destroy(prog->prog); | |
2275 | kfree(prog); | |
2276 | } | |
2277 | ||
9d6474e4 JW |
2278 | static int __tun_set_ebpf(struct tun_struct *tun, |
2279 | struct tun_prog __rcu **prog_p, | |
cd5681d7 | 2280 | struct bpf_prog *prog) |
96f84061 | 2281 | { |
cd5681d7 | 2282 | struct tun_prog *old, *new = NULL; |
96f84061 JW |
2283 | |
2284 | if (prog) { | |
2285 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2286 | if (!new) | |
2287 | return -ENOMEM; | |
2288 | new->prog = prog; | |
2289 | } | |
2290 | ||
124da8f6 | 2291 | spin_lock_bh(&tun->lock); |
cd5681d7 | 2292 | old = rcu_dereference_protected(*prog_p, |
124da8f6 | 2293 | lockdep_is_held(&tun->lock)); |
cd5681d7 | 2294 | rcu_assign_pointer(*prog_p, new); |
124da8f6 | 2295 | spin_unlock_bh(&tun->lock); |
96f84061 JW |
2296 | |
2297 | if (old) | |
cd5681d7 | 2298 | call_rcu(&old->rcu, tun_prog_free); |
96f84061 JW |
2299 | |
2300 | return 0; | |
2301 | } | |
2302 | ||
96442e42 JW |
2303 | static void tun_free_netdev(struct net_device *dev) |
2304 | { | |
2305 | struct tun_struct *tun = netdev_priv(dev); | |
2306 | ||
4008e97f | 2307 | BUG_ON(!(list_empty(&tun->disabled))); |
11fc7d5a | 2308 | |
497a5757 | 2309 | free_percpu(dev->tstats); |
96442e42 | 2310 | tun_flow_uninit(tun); |
5dbbaf2d | 2311 | security_tun_dev_free_security(tun->security); |
cd5681d7 | 2312 | __tun_set_ebpf(tun, &tun->steering_prog, NULL); |
aff3d70a | 2313 | __tun_set_ebpf(tun, &tun->filter_prog, NULL); |
96442e42 JW |
2314 | } |
2315 | ||
1da177e4 LT |
2316 | static void tun_setup(struct net_device *dev) |
2317 | { | |
2318 | struct tun_struct *tun = netdev_priv(dev); | |
2319 | ||
0625c883 EB |
2320 | tun->owner = INVALID_UID; |
2321 | tun->group = INVALID_GID; | |
4e24f2dd | 2322 | tun_default_link_ksettings(dev, &tun->link_ksettings); |
1da177e4 | 2323 | |
1da177e4 | 2324 | dev->ethtool_ops = &tun_ethtool_ops; |
cf124db5 DM |
2325 | dev->needs_free_netdev = true; |
2326 | dev->priv_destructor = tun_free_netdev; | |
016adb72 JW |
2327 | /* We prefer our own queue length */ |
2328 | dev->tx_queue_len = TUN_READQ_SIZE; | |
1da177e4 LT |
2329 | } |
2330 | ||
f019a7a5 EB |
2331 | /* Trivial set of netlink ops to allow deleting tun or tap |
2332 | * device with netlink. | |
2333 | */ | |
a8b8a889 MS |
2334 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[], |
2335 | struct netlink_ext_ack *extack) | |
f019a7a5 | 2336 | { |
35b827b6 ND |
2337 | NL_SET_ERR_MSG(extack, |
2338 | "tun/tap creation via rtnetlink is not supported."); | |
2339 | return -EOPNOTSUPP; | |
f019a7a5 EB |
2340 | } |
2341 | ||
1ec010e7 SD |
2342 | static size_t tun_get_size(const struct net_device *dev) |
2343 | { | |
2344 | BUILD_BUG_ON(sizeof(u32) != sizeof(uid_t)); | |
2345 | BUILD_BUG_ON(sizeof(u32) != sizeof(gid_t)); | |
2346 | ||
2347 | return nla_total_size(sizeof(uid_t)) + /* OWNER */ | |
2348 | nla_total_size(sizeof(gid_t)) + /* GROUP */ | |
2349 | nla_total_size(sizeof(u8)) + /* TYPE */ | |
2350 | nla_total_size(sizeof(u8)) + /* PI */ | |
2351 | nla_total_size(sizeof(u8)) + /* VNET_HDR */ | |
2352 | nla_total_size(sizeof(u8)) + /* PERSIST */ | |
2353 | nla_total_size(sizeof(u8)) + /* MULTI_QUEUE */ | |
2354 | nla_total_size(sizeof(u32)) + /* NUM_QUEUES */ | |
2355 | nla_total_size(sizeof(u32)) + /* NUM_DISABLED_QUEUES */ | |
2356 | 0; | |
2357 | } | |
2358 | ||
2359 | static int tun_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
2360 | { | |
2361 | struct tun_struct *tun = netdev_priv(dev); | |
2362 | ||
2363 | if (nla_put_u8(skb, IFLA_TUN_TYPE, tun->flags & TUN_TYPE_MASK)) | |
2364 | goto nla_put_failure; | |
2365 | if (uid_valid(tun->owner) && | |
2366 | nla_put_u32(skb, IFLA_TUN_OWNER, | |
2367 | from_kuid_munged(current_user_ns(), tun->owner))) | |
2368 | goto nla_put_failure; | |
2369 | if (gid_valid(tun->group) && | |
2370 | nla_put_u32(skb, IFLA_TUN_GROUP, | |
2371 | from_kgid_munged(current_user_ns(), tun->group))) | |
2372 | goto nla_put_failure; | |
2373 | if (nla_put_u8(skb, IFLA_TUN_PI, !(tun->flags & IFF_NO_PI))) | |
2374 | goto nla_put_failure; | |
2375 | if (nla_put_u8(skb, IFLA_TUN_VNET_HDR, !!(tun->flags & IFF_VNET_HDR))) | |
2376 | goto nla_put_failure; | |
2377 | if (nla_put_u8(skb, IFLA_TUN_PERSIST, !!(tun->flags & IFF_PERSIST))) | |
2378 | goto nla_put_failure; | |
2379 | if (nla_put_u8(skb, IFLA_TUN_MULTI_QUEUE, | |
2380 | !!(tun->flags & IFF_MULTI_QUEUE))) | |
2381 | goto nla_put_failure; | |
2382 | if (tun->flags & IFF_MULTI_QUEUE) { | |
2383 | if (nla_put_u32(skb, IFLA_TUN_NUM_QUEUES, tun->numqueues)) | |
2384 | goto nla_put_failure; | |
2385 | if (nla_put_u32(skb, IFLA_TUN_NUM_DISABLED_QUEUES, | |
2386 | tun->numdisabled)) | |
2387 | goto nla_put_failure; | |
2388 | } | |
2389 | ||
2390 | return 0; | |
2391 | ||
2392 | nla_put_failure: | |
2393 | return -EMSGSIZE; | |
2394 | } | |
2395 | ||
f019a7a5 EB |
2396 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
2397 | .kind = DRV_NAME, | |
2398 | .priv_size = sizeof(struct tun_struct), | |
2399 | .setup = tun_setup, | |
2400 | .validate = tun_validate, | |
1ec010e7 SD |
2401 | .get_size = tun_get_size, |
2402 | .fill_info = tun_fill_info, | |
f019a7a5 EB |
2403 | }; |
2404 | ||
33dccbb0 HX |
2405 | static void tun_sock_write_space(struct sock *sk) |
2406 | { | |
54f968d6 | 2407 | struct tun_file *tfile; |
43815482 | 2408 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
2409 | |
2410 | if (!sock_writeable(sk)) | |
2411 | return; | |
2412 | ||
9cd3e072 | 2413 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
33dccbb0 HX |
2414 | return; |
2415 | ||
43815482 ED |
2416 | wqueue = sk_sleep(sk); |
2417 | if (wqueue && waitqueue_active(wqueue)) | |
a9a08845 LT |
2418 | wake_up_interruptible_sync_poll(wqueue, EPOLLOUT | |
2419 | EPOLLWRNORM | EPOLLWRBAND); | |
c722c625 | 2420 | |
54f968d6 JW |
2421 | tfile = container_of(sk, struct tun_file, sk); |
2422 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
2423 | } |
2424 | ||
f9e06c45 JW |
2425 | static void tun_put_page(struct tun_page *tpage) |
2426 | { | |
2427 | if (tpage->page) | |
2428 | __page_frag_cache_drain(tpage->page, tpage->count); | |
2429 | } | |
2430 | ||
043d222f JW |
2431 | static int tun_xdp_one(struct tun_struct *tun, |
2432 | struct tun_file *tfile, | |
f9e06c45 JW |
2433 | struct xdp_buff *xdp, int *flush, |
2434 | struct tun_page *tpage) | |
043d222f | 2435 | { |
4e4b08e5 | 2436 | unsigned int datasize = xdp->data_end - xdp->data; |
043d222f JW |
2437 | struct tun_xdp_hdr *hdr = xdp->data_hard_start; |
2438 | struct virtio_net_hdr *gso = &hdr->gso; | |
043d222f JW |
2439 | struct bpf_prog *xdp_prog; |
2440 | struct sk_buff *skb = NULL; | |
fb3f9037 | 2441 | struct sk_buff_head *queue; |
043d222f JW |
2442 | u32 rxhash = 0, act; |
2443 | int buflen = hdr->buflen; | |
fb3f9037 | 2444 | int ret = 0; |
043d222f | 2445 | bool skb_xdp = false; |
f9e06c45 | 2446 | struct page *page; |
043d222f JW |
2447 | |
2448 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
2449 | if (xdp_prog) { | |
2450 | if (gso->gso_type) { | |
2451 | skb_xdp = true; | |
2452 | goto build; | |
2453 | } | |
43b5169d LB |
2454 | |
2455 | xdp_init_buff(xdp, buflen, &tfile->xdp_rxq); | |
043d222f | 2456 | xdp_set_data_meta_invalid(xdp); |
043d222f JW |
2457 | |
2458 | act = bpf_prog_run_xdp(xdp_prog, xdp); | |
fb3f9037 HH |
2459 | ret = tun_xdp_act(tun, xdp_prog, xdp, act); |
2460 | if (ret < 0) { | |
043d222f | 2461 | put_page(virt_to_head_page(xdp->data)); |
fb3f9037 | 2462 | return ret; |
043d222f JW |
2463 | } |
2464 | ||
fb3f9037 | 2465 | switch (ret) { |
043d222f JW |
2466 | case XDP_REDIRECT: |
2467 | *flush = true; | |
df561f66 | 2468 | fallthrough; |
043d222f JW |
2469 | case XDP_TX: |
2470 | return 0; | |
2471 | case XDP_PASS: | |
2472 | break; | |
2473 | default: | |
f9e06c45 JW |
2474 | page = virt_to_head_page(xdp->data); |
2475 | if (tpage->page == page) { | |
2476 | ++tpage->count; | |
2477 | } else { | |
2478 | tun_put_page(tpage); | |
2479 | tpage->page = page; | |
2480 | tpage->count = 1; | |
2481 | } | |
043d222f JW |
2482 | return 0; |
2483 | } | |
2484 | } | |
2485 | ||
2486 | build: | |
2487 | skb = build_skb(xdp->data_hard_start, buflen); | |
2488 | if (!skb) { | |
fb3f9037 | 2489 | ret = -ENOMEM; |
043d222f JW |
2490 | goto out; |
2491 | } | |
2492 | ||
2493 | skb_reserve(skb, xdp->data - xdp->data_hard_start); | |
2494 | skb_put(skb, xdp->data_end - xdp->data); | |
2495 | ||
2496 | if (virtio_net_hdr_to_skb(skb, gso, tun_is_little_endian(tun))) { | |
497a5757 | 2497 | atomic_long_inc(&tun->rx_frame_errors); |
043d222f | 2498 | kfree_skb(skb); |
fb3f9037 | 2499 | ret = -EINVAL; |
043d222f JW |
2500 | goto out; |
2501 | } | |
2502 | ||
2503 | skb->protocol = eth_type_trans(skb, tun->dev); | |
2504 | skb_reset_network_header(skb); | |
d2aa125d | 2505 | skb_probe_transport_header(skb); |
3fe260e0 | 2506 | skb_record_rx_queue(skb, tfile->queue_index); |
043d222f JW |
2507 | |
2508 | if (skb_xdp) { | |
fb3f9037 HH |
2509 | ret = do_xdp_generic(xdp_prog, skb); |
2510 | if (ret != XDP_PASS) { | |
2511 | ret = 0; | |
043d222f | 2512 | goto out; |
fb3f9037 | 2513 | } |
043d222f JW |
2514 | } |
2515 | ||
f29eb2a9 PA |
2516 | if (!rcu_dereference(tun->steering_prog) && tun->numqueues > 1 && |
2517 | !tfile->detached) | |
043d222f JW |
2518 | rxhash = __skb_get_hash_symmetric(skb); |
2519 | ||
fb3f9037 HH |
2520 | if (tfile->napi_enabled) { |
2521 | queue = &tfile->sk.sk_write_queue; | |
2522 | spin_lock(&queue->lock); | |
82b2bc27 KI |
2523 | |
2524 | if (unlikely(tfile->detached)) { | |
2525 | spin_unlock(&queue->lock); | |
2526 | kfree_skb(skb); | |
2527 | return -EBUSY; | |
2528 | } | |
2529 | ||
fb3f9037 HH |
2530 | __skb_queue_tail(queue, skb); |
2531 | spin_unlock(&queue->lock); | |
2532 | ret = 1; | |
2533 | } else { | |
2534 | netif_receive_skb(skb); | |
2535 | ret = 0; | |
2536 | } | |
043d222f | 2537 | |
497a5757 | 2538 | /* No need to disable preemption here since this function is |
6342ca64 PB |
2539 | * always called with bh disabled |
2540 | */ | |
497a5757 | 2541 | dev_sw_netstats_rx_add(tun->dev, datasize); |
043d222f JW |
2542 | |
2543 | if (rxhash) | |
2544 | tun_flow_update(tun, rxhash, tfile); | |
2545 | ||
2546 | out: | |
fb3f9037 | 2547 | return ret; |
043d222f JW |
2548 | } |
2549 | ||
1b784140 | 2550 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 2551 | { |
043d222f | 2552 | int ret, i; |
54f968d6 | 2553 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
9484dc74 | 2554 | struct tun_struct *tun = tun_get(tfile); |
fe8dd45b | 2555 | struct tun_msg_ctl *ctl = m->msg_control; |
043d222f | 2556 | struct xdp_buff *xdp; |
54f968d6 JW |
2557 | |
2558 | if (!tun) | |
2559 | return -EBADFD; | |
f5ff53b4 | 2560 | |
74a335a0 HH |
2561 | if (m->msg_controllen == sizeof(struct tun_msg_ctl) && |
2562 | ctl && ctl->type == TUN_MSG_PTR) { | |
6f0271d9 | 2563 | struct tun_page tpage; |
043d222f | 2564 | int n = ctl->num; |
fb3f9037 | 2565 | int flush = 0, queued = 0; |
043d222f | 2566 | |
6f0271d9 DM |
2567 | memset(&tpage, 0, sizeof(tpage)); |
2568 | ||
043d222f JW |
2569 | local_bh_disable(); |
2570 | rcu_read_lock(); | |
2571 | ||
2572 | for (i = 0; i < n; i++) { | |
2573 | xdp = &((struct xdp_buff *)ctl->ptr)[i]; | |
fb3f9037 HH |
2574 | ret = tun_xdp_one(tun, tfile, xdp, &flush, &tpage); |
2575 | if (ret > 0) | |
2576 | queued += ret; | |
043d222f JW |
2577 | } |
2578 | ||
2579 | if (flush) | |
1d233886 | 2580 | xdp_do_flush(); |
043d222f | 2581 | |
fb3f9037 HH |
2582 | if (tfile->napi_enabled && queued > 0) |
2583 | napi_schedule(&tfile->napi); | |
2584 | ||
043d222f JW |
2585 | rcu_read_unlock(); |
2586 | local_bh_enable(); | |
2587 | ||
f9e06c45 JW |
2588 | tun_put_page(&tpage); |
2589 | ||
043d222f JW |
2590 | ret = total_len; |
2591 | goto out; | |
2592 | } | |
fe8dd45b JW |
2593 | |
2594 | ret = tun_get_user(tun, tfile, ctl ? ctl->ptr : NULL, &m->msg_iter, | |
5503fcec JW |
2595 | m->msg_flags & MSG_DONTWAIT, |
2596 | m->msg_flags & MSG_MORE); | |
043d222f | 2597 | out: |
54f968d6 JW |
2598 | tun_put(tun); |
2599 | return ret; | |
05c2828c MT |
2600 | } |
2601 | ||
1b784140 | 2602 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
2603 | int flags) |
2604 | { | |
54f968d6 | 2605 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
9484dc74 | 2606 | struct tun_struct *tun = tun_get(tfile); |
fc72d1d5 | 2607 | void *ptr = m->msg_control; |
05c2828c | 2608 | int ret; |
54f968d6 | 2609 | |
c33ee15b WX |
2610 | if (!tun) { |
2611 | ret = -EBADFD; | |
fc72d1d5 | 2612 | goto out_free; |
c33ee15b | 2613 | } |
54f968d6 | 2614 | |
eda29772 | 2615 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 | 2616 | ret = -EINVAL; |
c33ee15b | 2617 | goto out_put_tun; |
3811ae76 | 2618 | } |
eda29772 RC |
2619 | if (flags & MSG_ERRQUEUE) { |
2620 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
2621 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
2622 | goto out; | |
2623 | } | |
fc72d1d5 | 2624 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, ptr); |
87897931 | 2625 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
2626 | m->msg_flags |= MSG_TRUNC; |
2627 | ret = flags & MSG_TRUNC ? ret : total_len; | |
2628 | } | |
3811ae76 | 2629 | out: |
54f968d6 | 2630 | tun_put(tun); |
05c2828c | 2631 | return ret; |
c33ee15b WX |
2632 | |
2633 | out_put_tun: | |
2634 | tun_put(tun); | |
fc72d1d5 JW |
2635 | out_free: |
2636 | tun_ptr_free(ptr); | |
c33ee15b | 2637 | return ret; |
05c2828c MT |
2638 | } |
2639 | ||
fc72d1d5 JW |
2640 | static int tun_ptr_peek_len(void *ptr) |
2641 | { | |
2642 | if (likely(ptr)) { | |
1ffcbc85 JDB |
2643 | if (tun_is_xdp_frame(ptr)) { |
2644 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2645 | |
1ffcbc85 | 2646 | return xdpf->len; |
fc72d1d5 JW |
2647 | } |
2648 | return __skb_array_len_with_tag(ptr); | |
2649 | } else { | |
2650 | return 0; | |
2651 | } | |
2652 | } | |
2653 | ||
1576d986 JW |
2654 | static int tun_peek_len(struct socket *sock) |
2655 | { | |
2656 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
2657 | struct tun_struct *tun; | |
2658 | int ret = 0; | |
2659 | ||
9484dc74 | 2660 | tun = tun_get(tfile); |
1576d986 JW |
2661 | if (!tun) |
2662 | return 0; | |
2663 | ||
fc72d1d5 | 2664 | ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, tun_ptr_peek_len); |
1576d986 JW |
2665 | tun_put(tun); |
2666 | ||
2667 | return ret; | |
2668 | } | |
2669 | ||
05c2828c MT |
2670 | /* Ops structure to mimic raw sockets with tun */ |
2671 | static const struct proto_ops tun_socket_ops = { | |
1576d986 | 2672 | .peek_len = tun_peek_len, |
05c2828c MT |
2673 | .sendmsg = tun_sendmsg, |
2674 | .recvmsg = tun_recvmsg, | |
2675 | }; | |
2676 | ||
33dccbb0 HX |
2677 | static struct proto tun_proto = { |
2678 | .name = "tun", | |
2679 | .owner = THIS_MODULE, | |
54f968d6 | 2680 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 2681 | }; |
f019a7a5 | 2682 | |
980c9e8c DW |
2683 | static int tun_flags(struct tun_struct *tun) |
2684 | { | |
031f5e03 | 2685 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
2686 | } |
2687 | ||
bc6d076d | 2688 | static ssize_t tun_flags_show(struct device *dev, struct device_attribute *attr, |
980c9e8c DW |
2689 | char *buf) |
2690 | { | |
2691 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
aff30699 | 2692 | return sysfs_emit(buf, "0x%x\n", tun_flags(tun)); |
980c9e8c DW |
2693 | } |
2694 | ||
bc6d076d Y |
2695 | static ssize_t owner_show(struct device *dev, struct device_attribute *attr, |
2696 | char *buf) | |
980c9e8c DW |
2697 | { |
2698 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 | 2699 | return uid_valid(tun->owner)? |
aff30699 WY |
2700 | sysfs_emit(buf, "%u\n", |
2701 | from_kuid_munged(current_user_ns(), tun->owner)) : | |
2702 | sysfs_emit(buf, "-1\n"); | |
980c9e8c DW |
2703 | } |
2704 | ||
bc6d076d Y |
2705 | static ssize_t group_show(struct device *dev, struct device_attribute *attr, |
2706 | char *buf) | |
980c9e8c DW |
2707 | { |
2708 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 | 2709 | return gid_valid(tun->group) ? |
aff30699 WY |
2710 | sysfs_emit(buf, "%u\n", |
2711 | from_kgid_munged(current_user_ns(), tun->group)) : | |
2712 | sysfs_emit(buf, "-1\n"); | |
980c9e8c DW |
2713 | } |
2714 | ||
bc6d076d Y |
2715 | static DEVICE_ATTR_RO(tun_flags); |
2716 | static DEVICE_ATTR_RO(owner); | |
2717 | static DEVICE_ATTR_RO(group); | |
980c9e8c | 2718 | |
c4d33e24 TI |
2719 | static struct attribute *tun_dev_attrs[] = { |
2720 | &dev_attr_tun_flags.attr, | |
2721 | &dev_attr_owner.attr, | |
2722 | &dev_attr_group.attr, | |
2723 | NULL | |
2724 | }; | |
2725 | ||
2726 | static const struct attribute_group tun_attr_group = { | |
2727 | .attrs = tun_dev_attrs | |
2728 | }; | |
2729 | ||
d647a591 | 2730 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
2731 | { |
2732 | struct tun_struct *tun; | |
54f968d6 | 2733 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2734 | struct net_device *dev; |
2735 | int err; | |
2736 | ||
7c0c3b1a JW |
2737 | if (tfile->detached) |
2738 | return -EINVAL; | |
2739 | ||
90e33d45 PP |
2740 | if ((ifr->ifr_flags & IFF_NAPI_FRAGS)) { |
2741 | if (!capable(CAP_NET_ADMIN)) | |
2742 | return -EPERM; | |
2743 | ||
2744 | if (!(ifr->ifr_flags & IFF_NAPI) || | |
2745 | (ifr->ifr_flags & TUN_TYPE_MASK) != IFF_TAP) | |
2746 | return -EINVAL; | |
2747 | } | |
2748 | ||
74a3e5a7 EB |
2749 | dev = __dev_get_by_name(net, ifr->ifr_name); |
2750 | if (dev) { | |
f85ba780 DW |
2751 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
2752 | return -EBUSY; | |
74a3e5a7 EB |
2753 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
2754 | tun = netdev_priv(dev); | |
2755 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
2756 | tun = netdev_priv(dev); | |
2757 | else | |
2758 | return -EINVAL; | |
2759 | ||
8e6d91ae | 2760 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 2761 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
2762 | return -EINVAL; |
2763 | ||
cde8b15f | 2764 | if (tun_not_capable(tun)) |
2b980dbd | 2765 | return -EPERM; |
5dbbaf2d | 2766 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
2767 | if (err < 0) |
2768 | return err; | |
2769 | ||
94317099 | 2770 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER, |
af3fb24e | 2771 | ifr->ifr_flags & IFF_NAPI, |
77f22f92 | 2772 | ifr->ifr_flags & IFF_NAPI_FRAGS, true); |
a7385ba2 EB |
2773 | if (err < 0) |
2774 | return err; | |
4008e97f | 2775 | |
40630b82 | 2776 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
2777 | (tun->numqueues + tun->numdisabled > 1)) { |
2778 | /* One or more queue has already been attached, no need | |
2779 | * to initialize the device again. | |
2780 | */ | |
83c1f36f | 2781 | netdev_state_change(dev); |
e8dbad66 JW |
2782 | return 0; |
2783 | } | |
9fffc5c6 SD |
2784 | |
2785 | tun->flags = (tun->flags & ~TUN_FEATURES) | | |
2786 | (ifr->ifr_flags & TUN_FEATURES); | |
83c1f36f SD |
2787 | |
2788 | netdev_state_change(dev); | |
2789 | } else { | |
1da177e4 LT |
2790 | char *name; |
2791 | unsigned long flags = 0; | |
edfb6a14 JW |
2792 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
2793 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 2794 | |
c260b772 | 2795 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 2796 | return -EPERM; |
2b980dbd PM |
2797 | err = security_tun_dev_create(); |
2798 | if (err < 0) | |
2799 | return err; | |
ca6bb5d7 | 2800 | |
1da177e4 LT |
2801 | /* Set dev type */ |
2802 | if (ifr->ifr_flags & IFF_TUN) { | |
2803 | /* TUN device */ | |
40630b82 | 2804 | flags |= IFF_TUN; |
1da177e4 LT |
2805 | name = "tun%d"; |
2806 | } else if (ifr->ifr_flags & IFF_TAP) { | |
2807 | /* TAP device */ | |
40630b82 | 2808 | flags |= IFF_TAP; |
1da177e4 | 2809 | name = "tap%d"; |
6aa20a22 | 2810 | } else |
36989b90 | 2811 | return -EINVAL; |
6aa20a22 | 2812 | |
1da177e4 LT |
2813 | if (*ifr->ifr_name) |
2814 | name = ifr->ifr_name; | |
2815 | ||
c8d68e6b | 2816 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
2817 | NET_NAME_UNKNOWN, tun_setup, queues, |
2818 | queues); | |
edfb6a14 | 2819 | |
1da177e4 LT |
2820 | if (!dev) |
2821 | return -ENOMEM; | |
2822 | ||
fc54c658 | 2823 | dev_net_set(dev, net); |
f019a7a5 | 2824 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 2825 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 2826 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 2827 | |
1da177e4 LT |
2828 | tun = netdev_priv(dev); |
2829 | tun->dev = dev; | |
2830 | tun->flags = flags; | |
f271b2cc | 2831 | tun->txflt.count = 0; |
d9d52b51 | 2832 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 2833 | |
eaea34b2 | 2834 | tun->align = NET_SKB_PAD; |
54f968d6 JW |
2835 | tun->filter_attached = false; |
2836 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
5503fcec | 2837 | tun->rx_batched = 0; |
96f84061 | 2838 | RCU_INIT_POINTER(tun->steering_prog, NULL); |
33dccbb0 | 2839 | |
158b515f GK |
2840 | tun->ifr = ifr; |
2841 | tun->file = file; | |
608b9977 | 2842 | |
158b515f | 2843 | tun_net_initialize(dev); |
eb0fb363 | 2844 | |
1da177e4 | 2845 | err = register_netdevice(tun->dev); |
158b515f GK |
2846 | if (err < 0) { |
2847 | free_netdev(dev); | |
2848 | return err; | |
2849 | } | |
c2e315b8 | 2850 | /* free_netdev() won't check refcnt, to avoid race |
77f22f92 YY |
2851 | * with dev_put() we need publish tun after registration. |
2852 | */ | |
2853 | rcu_assign_pointer(tfile->tun, tun); | |
1da177e4 LT |
2854 | } |
2855 | ||
195624d9 PR |
2856 | if (ifr->ifr_flags & IFF_NO_CARRIER) |
2857 | netif_carrier_off(tun->dev); | |
2858 | else | |
2859 | netif_carrier_on(tun->dev); | |
af668b3c | 2860 | |
e35259a9 MK |
2861 | /* Make sure persistent devices do not get stuck in |
2862 | * xoff state. | |
2863 | */ | |
2864 | if (netif_running(tun->dev)) | |
c8d68e6b | 2865 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 2866 | |
1da177e4 LT |
2867 | strcpy(ifr->ifr_name, tun->dev->name); |
2868 | return 0; | |
1da177e4 LT |
2869 | } |
2870 | ||
12132768 | 2871 | static void tun_get_iff(struct tun_struct *tun, struct ifreq *ifr) |
e3b99556 | 2872 | { |
e3b99556 MM |
2873 | strcpy(ifr->ifr_name, tun->dev->name); |
2874 | ||
980c9e8c | 2875 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 2876 | |
e3b99556 MM |
2877 | } |
2878 | ||
5228ddc9 RR |
2879 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
2880 | * privs required. */ | |
88255375 | 2881 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 2882 | { |
c8f44aff | 2883 | netdev_features_t features = 0; |
5228ddc9 RR |
2884 | |
2885 | if (arg & TUN_F_CSUM) { | |
88255375 | 2886 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
2887 | arg &= ~TUN_F_CSUM; |
2888 | ||
2889 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
2890 | if (arg & TUN_F_TSO_ECN) { | |
2891 | features |= NETIF_F_TSO_ECN; | |
2892 | arg &= ~TUN_F_TSO_ECN; | |
2893 | } | |
2894 | if (arg & TUN_F_TSO4) | |
2895 | features |= NETIF_F_TSO; | |
2896 | if (arg & TUN_F_TSO6) | |
2897 | features |= NETIF_F_TSO6; | |
2898 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
2899 | } | |
0c19f846 WB |
2900 | |
2901 | arg &= ~TUN_F_UFO; | |
399e0827 AM |
2902 | |
2903 | /* TODO: for now USO4 and USO6 should work simultaneously */ | |
2904 | if (arg & TUN_F_USO4 && arg & TUN_F_USO6) { | |
2905 | features |= NETIF_F_GSO_UDP_L4; | |
2906 | arg &= ~(TUN_F_USO4 | TUN_F_USO6); | |
2907 | } | |
5228ddc9 RR |
2908 | } |
2909 | ||
2910 | /* This gives the user a way to test for new features in future by | |
2911 | * trying to set them. */ | |
2912 | if (arg) | |
2913 | return -EINVAL; | |
2914 | ||
88255375 | 2915 | tun->set_features = features; |
09050957 YI |
2916 | tun->dev->wanted_features &= ~TUN_USER_FEATURES; |
2917 | tun->dev->wanted_features |= features; | |
88255375 | 2918 | netdev_update_features(tun->dev); |
5228ddc9 RR |
2919 | |
2920 | return 0; | |
2921 | } | |
2922 | ||
c8d68e6b JW |
2923 | static void tun_detach_filter(struct tun_struct *tun, int n) |
2924 | { | |
2925 | int i; | |
2926 | struct tun_file *tfile; | |
2927 | ||
2928 | for (i = 0; i < n; i++) { | |
b8deabd3 | 2929 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2930 | lock_sock(tfile->socket.sk); |
2931 | sk_detach_filter(tfile->socket.sk); | |
2932 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2933 | } |
2934 | ||
2935 | tun->filter_attached = false; | |
2936 | } | |
2937 | ||
2938 | static int tun_attach_filter(struct tun_struct *tun) | |
2939 | { | |
2940 | int i, ret = 0; | |
2941 | struct tun_file *tfile; | |
2942 | ||
2943 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2944 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2945 | lock_sock(tfile->socket.sk); |
2946 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
2947 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2948 | if (ret) { |
2949 | tun_detach_filter(tun, i); | |
2950 | return ret; | |
2951 | } | |
2952 | } | |
2953 | ||
2954 | tun->filter_attached = true; | |
2955 | return ret; | |
2956 | } | |
2957 | ||
2958 | static void tun_set_sndbuf(struct tun_struct *tun) | |
2959 | { | |
2960 | struct tun_file *tfile; | |
2961 | int i; | |
2962 | ||
2963 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2964 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
2965 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
2966 | } | |
2967 | } | |
2968 | ||
cde8b15f JW |
2969 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
2970 | { | |
2971 | struct tun_file *tfile = file->private_data; | |
2972 | struct tun_struct *tun; | |
cde8b15f JW |
2973 | int ret = 0; |
2974 | ||
2975 | rtnl_lock(); | |
2976 | ||
2977 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 2978 | tun = tfile->detached; |
5dbbaf2d | 2979 | if (!tun) { |
cde8b15f | 2980 | ret = -EINVAL; |
5dbbaf2d PM |
2981 | goto unlock; |
2982 | } | |
2983 | ret = security_tun_dev_attach_queue(tun->security); | |
2984 | if (ret < 0) | |
2985 | goto unlock; | |
af3fb24e | 2986 | ret = tun_attach(tun, file, false, tun->flags & IFF_NAPI, |
77f22f92 | 2987 | tun->flags & IFF_NAPI_FRAGS, true); |
4008e97f | 2988 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 2989 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 2990 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
2991 | ret = -EINVAL; |
2992 | else | |
2993 | __tun_detach(tfile, false); | |
2994 | } else | |
cde8b15f JW |
2995 | ret = -EINVAL; |
2996 | ||
83c1f36f SD |
2997 | if (ret >= 0) |
2998 | netdev_state_change(tun->dev); | |
2999 | ||
5dbbaf2d | 3000 | unlock: |
cde8b15f JW |
3001 | rtnl_unlock(); |
3002 | return ret; | |
3003 | } | |
3004 | ||
8f3f330d | 3005 | static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog __rcu **prog_p, |
cd5681d7 | 3006 | void __user *data) |
96f84061 JW |
3007 | { |
3008 | struct bpf_prog *prog; | |
3009 | int fd; | |
3010 | ||
3011 | if (copy_from_user(&fd, data, sizeof(fd))) | |
3012 | return -EFAULT; | |
3013 | ||
3014 | if (fd == -1) { | |
3015 | prog = NULL; | |
3016 | } else { | |
3017 | prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); | |
3018 | if (IS_ERR(prog)) | |
3019 | return PTR_ERR(prog); | |
3020 | } | |
3021 | ||
cd5681d7 | 3022 | return __tun_set_ebpf(tun, prog_p, prog); |
96f84061 JW |
3023 | } |
3024 | ||
cca8ea3b PP |
3025 | /* Return correct value for tun->dev->addr_len based on tun->dev->type. */ |
3026 | static unsigned char tun_get_addr_len(unsigned short type) | |
3027 | { | |
3028 | switch (type) { | |
3029 | case ARPHRD_IP6GRE: | |
3030 | case ARPHRD_TUNNEL6: | |
3031 | return sizeof(struct in6_addr); | |
3032 | case ARPHRD_IPGRE: | |
3033 | case ARPHRD_TUNNEL: | |
3034 | case ARPHRD_SIT: | |
3035 | return 4; | |
3036 | case ARPHRD_ETHER: | |
3037 | return ETH_ALEN; | |
3038 | case ARPHRD_IEEE802154: | |
3039 | case ARPHRD_IEEE802154_MONITOR: | |
3040 | return IEEE802154_EXTENDED_ADDR_LEN; | |
3041 | case ARPHRD_PHONET_PIPE: | |
3042 | case ARPHRD_PPP: | |
3043 | case ARPHRD_NONE: | |
3044 | return 0; | |
3045 | case ARPHRD_6LOWPAN: | |
3046 | return EUI64_ADDR_LEN; | |
3047 | case ARPHRD_FDDI: | |
3048 | return FDDI_K_ALEN; | |
3049 | case ARPHRD_HIPPI: | |
3050 | return HIPPI_ALEN; | |
3051 | case ARPHRD_IEEE802: | |
3052 | return FC_ALEN; | |
3053 | case ARPHRD_ROSE: | |
3054 | return ROSE_ADDR_LEN; | |
3055 | case ARPHRD_NETROM: | |
3056 | return AX25_ADDR_LEN; | |
3057 | case ARPHRD_LOCALTLK: | |
3058 | return LTALK_ALEN; | |
3059 | default: | |
3060 | return 0; | |
3061 | } | |
3062 | } | |
3063 | ||
50857e2a AB |
3064 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
3065 | unsigned long arg, int ifreq_len) | |
1da177e4 | 3066 | { |
36b50bab | 3067 | struct tun_file *tfile = file->private_data; |
f663706a | 3068 | struct net *net = sock_net(&tfile->sk); |
631ab46b | 3069 | struct tun_struct *tun; |
1da177e4 | 3070 | void __user* argp = (void __user*)arg; |
26d31925 | 3071 | unsigned int ifindex, carrier; |
1da177e4 | 3072 | struct ifreq ifr; |
0625c883 EB |
3073 | kuid_t owner; |
3074 | kgid_t group; | |
33dccbb0 | 3075 | int sndbuf; |
d9d52b51 | 3076 | int vnet_hdr_sz; |
1cf8e410 | 3077 | int le; |
f271b2cc | 3078 | int ret; |
83c1f36f | 3079 | bool do_notify = false; |
1da177e4 | 3080 | |
f2780d6d KT |
3081 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || |
3082 | (_IOC_TYPE(cmd) == SOCK_IOC_TYPE && cmd != SIOCGSKNS)) { | |
50857e2a | 3083 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 3084 | return -EFAULT; |
8bbb1813 | 3085 | } else { |
a117dacd | 3086 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 3087 | } |
631ab46b EB |
3088 | if (cmd == TUNGETFEATURES) { |
3089 | /* Currently this just means: "what IFF flags are valid?". | |
3090 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
3091 | * TUNSETIFF. |
3092 | */ | |
195624d9 PR |
3093 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_CARRIER | |
3094 | TUN_FEATURES, (unsigned int __user*)argp); | |
f663706a | 3095 | } else if (cmd == TUNSETQUEUE) { |
cde8b15f | 3096 | return tun_set_queue(file, &ifr); |
f663706a KT |
3097 | } else if (cmd == SIOCGSKNS) { |
3098 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
3099 | return -EPERM; | |
3100 | return open_related_ns(&net->ns, get_net_ns); | |
3101 | } | |
631ab46b | 3102 | |
876bfd4d HX |
3103 | rtnl_lock(); |
3104 | ||
9484dc74 | 3105 | tun = tun_get(tfile); |
0f16bc13 GF |
3106 | if (cmd == TUNSETIFF) { |
3107 | ret = -EEXIST; | |
3108 | if (tun) | |
3109 | goto unlock; | |
3110 | ||
1da177e4 LT |
3111 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
3112 | ||
f2780d6d | 3113 | ret = tun_set_iff(net, file, &ifr); |
1da177e4 | 3114 | |
876bfd4d HX |
3115 | if (ret) |
3116 | goto unlock; | |
1da177e4 | 3117 | |
50857e2a | 3118 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
3119 | ret = -EFAULT; |
3120 | goto unlock; | |
1da177e4 | 3121 | } |
fb7589a1 PE |
3122 | if (cmd == TUNSETIFINDEX) { |
3123 | ret = -EPERM; | |
3124 | if (tun) | |
3125 | goto unlock; | |
3126 | ||
3127 | ret = -EFAULT; | |
3128 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
3129 | goto unlock; | |
3130 | ||
3131 | ret = 0; | |
3132 | tfile->ifindex = ifindex; | |
3133 | goto unlock; | |
3134 | } | |
1da177e4 | 3135 | |
876bfd4d | 3136 | ret = -EBADFD; |
1da177e4 | 3137 | if (!tun) |
876bfd4d | 3138 | goto unlock; |
1da177e4 | 3139 | |
3424170f | 3140 | netif_info(tun, drv, tun->dev, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 3141 | |
0c3e0e3b | 3142 | net = dev_net(tun->dev); |
631ab46b | 3143 | ret = 0; |
1da177e4 | 3144 | switch (cmd) { |
e3b99556 | 3145 | case TUNGETIFF: |
12132768 | 3146 | tun_get_iff(tun, &ifr); |
e3b99556 | 3147 | |
3d407a80 PE |
3148 | if (tfile->detached) |
3149 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
3150 | if (!tfile->socket.sk->sk_filter) |
3151 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 3152 | |
50857e2a | 3153 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 3154 | ret = -EFAULT; |
e3b99556 MM |
3155 | break; |
3156 | ||
1da177e4 LT |
3157 | case TUNSETNOCSUM: |
3158 | /* Disable/Enable checksum */ | |
1da177e4 | 3159 | |
88255375 | 3160 | /* [unimplemented] */ |
3424170f MK |
3161 | netif_info(tun, drv, tun->dev, "ignored: set checksum %s\n", |
3162 | arg ? "disabled" : "enabled"); | |
1da177e4 LT |
3163 | break; |
3164 | ||
3165 | case TUNSETPERSIST: | |
54f968d6 JW |
3166 | /* Disable/Enable persist mode. Keep an extra reference to the |
3167 | * module to prevent the module being unprobed. | |
3168 | */ | |
40630b82 MT |
3169 | if (arg && !(tun->flags & IFF_PERSIST)) { |
3170 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 3171 | __module_get(THIS_MODULE); |
83c1f36f | 3172 | do_notify = true; |
dd38bd85 | 3173 | } |
40630b82 MT |
3174 | if (!arg && (tun->flags & IFF_PERSIST)) { |
3175 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 | 3176 | module_put(THIS_MODULE); |
83c1f36f | 3177 | do_notify = true; |
54f968d6 | 3178 | } |
1da177e4 | 3179 | |
3424170f MK |
3180 | netif_info(tun, drv, tun->dev, "persist %s\n", |
3181 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
3182 | break; |
3183 | ||
3184 | case TUNSETOWNER: | |
3185 | /* Set owner of the device */ | |
0625c883 EB |
3186 | owner = make_kuid(current_user_ns(), arg); |
3187 | if (!uid_valid(owner)) { | |
3188 | ret = -EINVAL; | |
3189 | break; | |
3190 | } | |
3191 | tun->owner = owner; | |
83c1f36f | 3192 | do_notify = true; |
3424170f MK |
3193 | netif_info(tun, drv, tun->dev, "owner set to %u\n", |
3194 | from_kuid(&init_user_ns, tun->owner)); | |
1da177e4 LT |
3195 | break; |
3196 | ||
8c644623 GG |
3197 | case TUNSETGROUP: |
3198 | /* Set group of the device */ | |
0625c883 EB |
3199 | group = make_kgid(current_user_ns(), arg); |
3200 | if (!gid_valid(group)) { | |
3201 | ret = -EINVAL; | |
3202 | break; | |
3203 | } | |
3204 | tun->group = group; | |
83c1f36f | 3205 | do_notify = true; |
3424170f MK |
3206 | netif_info(tun, drv, tun->dev, "group set to %u\n", |
3207 | from_kgid(&init_user_ns, tun->group)); | |
8c644623 GG |
3208 | break; |
3209 | ||
ff4cc3ac MK |
3210 | case TUNSETLINK: |
3211 | /* Only allow setting the type when the interface is down */ | |
3212 | if (tun->dev->flags & IFF_UP) { | |
3424170f MK |
3213 | netif_info(tun, drv, tun->dev, |
3214 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 3215 | ret = -EBUSY; |
ff4cc3ac | 3216 | } else { |
8e1e33ff MS |
3217 | ret = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, |
3218 | tun->dev); | |
3219 | ret = notifier_to_errno(ret); | |
3220 | if (ret) { | |
3221 | netif_info(tun, drv, tun->dev, | |
3222 | "Refused to change device type\n"); | |
3223 | break; | |
3224 | } | |
ff4cc3ac | 3225 | tun->dev->type = (int) arg; |
cca8ea3b | 3226 | tun->dev->addr_len = tun_get_addr_len(tun->dev->type); |
3424170f MK |
3227 | netif_info(tun, drv, tun->dev, "linktype set to %d\n", |
3228 | tun->dev->type); | |
8e1e33ff MS |
3229 | call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, |
3230 | tun->dev); | |
ff4cc3ac | 3231 | } |
631ab46b | 3232 | break; |
ff4cc3ac | 3233 | |
1da177e4 | 3234 | case TUNSETDEBUG: |
3424170f | 3235 | tun->msg_enable = (u32)arg; |
1da177e4 | 3236 | break; |
3424170f | 3237 | |
5228ddc9 | 3238 | case TUNSETOFFLOAD: |
88255375 | 3239 | ret = set_offload(tun, arg); |
631ab46b | 3240 | break; |
5228ddc9 | 3241 | |
f271b2cc MK |
3242 | case TUNSETTXFILTER: |
3243 | /* Can be set only for TAPs */ | |
631ab46b | 3244 | ret = -EINVAL; |
40630b82 | 3245 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 3246 | break; |
c0e5a8c2 | 3247 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 3248 | break; |
1da177e4 LT |
3249 | |
3250 | case SIOCGIFHWADDR: | |
b595076a | 3251 | /* Get hw address */ |
3b23a32a | 3252 | dev_get_mac_address(&ifr.ifr_hwaddr, net, tun->dev->name); |
50857e2a | 3253 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
3254 | ret = -EFAULT; |
3255 | break; | |
1da177e4 LT |
3256 | |
3257 | case SIOCSIFHWADDR: | |
f271b2cc | 3258 | /* Set hw address */ |
3b23a32a | 3259 | ret = dev_set_mac_address_user(tun->dev, &ifr.ifr_hwaddr, NULL); |
631ab46b | 3260 | break; |
33dccbb0 HX |
3261 | |
3262 | case TUNGETSNDBUF: | |
54f968d6 | 3263 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
3264 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
3265 | ret = -EFAULT; | |
3266 | break; | |
3267 | ||
3268 | case TUNSETSNDBUF: | |
3269 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
3270 | ret = -EFAULT; | |
3271 | break; | |
3272 | } | |
93161922 CG |
3273 | if (sndbuf <= 0) { |
3274 | ret = -EINVAL; | |
3275 | break; | |
3276 | } | |
33dccbb0 | 3277 | |
c8d68e6b JW |
3278 | tun->sndbuf = sndbuf; |
3279 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
3280 | break; |
3281 | ||
d9d52b51 MT |
3282 | case TUNGETVNETHDRSZ: |
3283 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
3284 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
3285 | ret = -EFAULT; | |
3286 | break; | |
3287 | ||
3288 | case TUNSETVNETHDRSZ: | |
3289 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
3290 | ret = -EFAULT; | |
3291 | break; | |
3292 | } | |
3293 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
3294 | ret = -EINVAL; | |
3295 | break; | |
3296 | } | |
3297 | ||
3298 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
3299 | break; | |
3300 | ||
1cf8e410 MT |
3301 | case TUNGETVNETLE: |
3302 | le = !!(tun->flags & TUN_VNET_LE); | |
3303 | if (put_user(le, (int __user *)argp)) | |
3304 | ret = -EFAULT; | |
3305 | break; | |
3306 | ||
3307 | case TUNSETVNETLE: | |
3308 | if (get_user(le, (int __user *)argp)) { | |
3309 | ret = -EFAULT; | |
3310 | break; | |
3311 | } | |
3312 | if (le) | |
3313 | tun->flags |= TUN_VNET_LE; | |
3314 | else | |
3315 | tun->flags &= ~TUN_VNET_LE; | |
3316 | break; | |
3317 | ||
8b8e658b GK |
3318 | case TUNGETVNETBE: |
3319 | ret = tun_get_vnet_be(tun, argp); | |
3320 | break; | |
3321 | ||
3322 | case TUNSETVNETBE: | |
3323 | ret = tun_set_vnet_be(tun, argp); | |
3324 | break; | |
3325 | ||
99405162 MT |
3326 | case TUNATTACHFILTER: |
3327 | /* Can be set only for TAPs */ | |
3328 | ret = -EINVAL; | |
40630b82 | 3329 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
3330 | break; |
3331 | ret = -EFAULT; | |
54f968d6 | 3332 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
3333 | break; |
3334 | ||
c8d68e6b | 3335 | ret = tun_attach_filter(tun); |
99405162 MT |
3336 | break; |
3337 | ||
3338 | case TUNDETACHFILTER: | |
3339 | /* Can be set only for TAPs */ | |
3340 | ret = -EINVAL; | |
40630b82 | 3341 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 3342 | break; |
c8d68e6b JW |
3343 | ret = 0; |
3344 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
3345 | break; |
3346 | ||
76975e9c PE |
3347 | case TUNGETFILTER: |
3348 | ret = -EINVAL; | |
40630b82 | 3349 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
3350 | break; |
3351 | ret = -EFAULT; | |
3352 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
3353 | break; | |
3354 | ret = 0; | |
3355 | break; | |
3356 | ||
96f84061 | 3357 | case TUNSETSTEERINGEBPF: |
cd5681d7 | 3358 | ret = tun_set_ebpf(tun, &tun->steering_prog, argp); |
96f84061 JW |
3359 | break; |
3360 | ||
aff3d70a JW |
3361 | case TUNSETFILTEREBPF: |
3362 | ret = tun_set_ebpf(tun, &tun->filter_prog, argp); | |
3363 | break; | |
3364 | ||
26d31925 ND |
3365 | case TUNSETCARRIER: |
3366 | ret = -EFAULT; | |
3367 | if (copy_from_user(&carrier, argp, sizeof(carrier))) | |
3368 | goto unlock; | |
3369 | ||
3370 | ret = tun_net_change_carrier(tun->dev, (bool)carrier); | |
3371 | break; | |
3372 | ||
0c3e0e3b KT |
3373 | case TUNGETDEVNETNS: |
3374 | ret = -EPERM; | |
3375 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
3376 | goto unlock; | |
3377 | ret = open_related_ns(&net->ns, get_net_ns); | |
3378 | break; | |
3379 | ||
1da177e4 | 3380 | default: |
631ab46b EB |
3381 | ret = -EINVAL; |
3382 | break; | |
ee289b64 | 3383 | } |
1da177e4 | 3384 | |
83c1f36f SD |
3385 | if (do_notify) |
3386 | netdev_state_change(tun->dev); | |
3387 | ||
876bfd4d HX |
3388 | unlock: |
3389 | rtnl_unlock(); | |
3390 | if (tun) | |
3391 | tun_put(tun); | |
631ab46b | 3392 | return ret; |
1da177e4 LT |
3393 | } |
3394 | ||
50857e2a AB |
3395 | static long tun_chr_ioctl(struct file *file, |
3396 | unsigned int cmd, unsigned long arg) | |
3397 | { | |
3398 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
3399 | } | |
3400 | ||
3401 | #ifdef CONFIG_COMPAT | |
3402 | static long tun_chr_compat_ioctl(struct file *file, | |
3403 | unsigned int cmd, unsigned long arg) | |
3404 | { | |
3405 | switch (cmd) { | |
3406 | case TUNSETIFF: | |
3407 | case TUNGETIFF: | |
3408 | case TUNSETTXFILTER: | |
3409 | case TUNGETSNDBUF: | |
3410 | case TUNSETSNDBUF: | |
3411 | case SIOCGIFHWADDR: | |
3412 | case SIOCSIFHWADDR: | |
3413 | arg = (unsigned long)compat_ptr(arg); | |
3414 | break; | |
3415 | default: | |
3416 | arg = (compat_ulong_t)arg; | |
3417 | break; | |
3418 | } | |
3419 | ||
3420 | /* | |
3421 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
3422 | * the end of that structure. All fields that are used in this | |
3423 | * driver are compatible though, we don't need to convert the | |
3424 | * contents. | |
3425 | */ | |
3426 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
3427 | } | |
3428 | #endif /* CONFIG_COMPAT */ | |
3429 | ||
1da177e4 LT |
3430 | static int tun_chr_fasync(int fd, struct file *file, int on) |
3431 | { | |
54f968d6 | 3432 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
3433 | int ret; |
3434 | ||
54f968d6 | 3435 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 3436 | goto out; |
6aa20a22 | 3437 | |
1da177e4 | 3438 | if (on) { |
01919134 | 3439 | __f_setown(file, task_pid(current), PIDTYPE_TGID, 0); |
54f968d6 | 3440 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 3441 | } else |
54f968d6 | 3442 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
3443 | ret = 0; |
3444 | out: | |
9d319522 | 3445 | return ret; |
1da177e4 LT |
3446 | } |
3447 | ||
3448 | static int tun_chr_open(struct inode *inode, struct file * file) | |
3449 | { | |
140e807d | 3450 | struct net *net = current->nsproxy->net_ns; |
631ab46b | 3451 | struct tun_file *tfile; |
deed49fb | 3452 | |
140e807d | 3453 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
11aa9c28 | 3454 | &tun_proto, 0); |
631ab46b EB |
3455 | if (!tfile) |
3456 | return -ENOMEM; | |
b196d88a JW |
3457 | if (ptr_ring_init(&tfile->tx_ring, 0, GFP_KERNEL)) { |
3458 | sk_free(&tfile->sk); | |
3459 | return -ENOMEM; | |
3460 | } | |
3461 | ||
c7256f57 | 3462 | mutex_init(&tfile->napi_mutex); |
c956674b | 3463 | RCU_INIT_POINTER(tfile->tun, NULL); |
54f968d6 | 3464 | tfile->flags = 0; |
fb7589a1 | 3465 | tfile->ifindex = 0; |
54f968d6 | 3466 | |
333f7909 | 3467 | init_waitqueue_head(&tfile->socket.wq.wait); |
54f968d6 JW |
3468 | |
3469 | tfile->socket.file = file; | |
3470 | tfile->socket.ops = &tun_socket_ops; | |
3471 | ||
a096ccca | 3472 | sock_init_data_uid(&tfile->socket, &tfile->sk, inode->i_uid); |
54f968d6 JW |
3473 | |
3474 | tfile->sk.sk_write_space = tun_sock_write_space; | |
3475 | tfile->sk.sk_sndbuf = INT_MAX; | |
3476 | ||
631ab46b | 3477 | file->private_data = tfile; |
4008e97f | 3478 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 3479 | |
19a6afb2 JW |
3480 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
3481 | ||
438b4060 JA |
3482 | /* tun groks IOCB_NOWAIT just fine, mark it as such */ |
3483 | file->f_mode |= FMODE_NOWAIT; | |
1da177e4 LT |
3484 | return 0; |
3485 | } | |
3486 | ||
3487 | static int tun_chr_close(struct inode *inode, struct file *file) | |
3488 | { | |
631ab46b | 3489 | struct tun_file *tfile = file->private_data; |
1da177e4 | 3490 | |
c8d68e6b | 3491 | tun_detach(tfile, true); |
1da177e4 LT |
3492 | |
3493 | return 0; | |
3494 | } | |
3495 | ||
93e14b6d | 3496 | #ifdef CONFIG_PROC_FS |
9484dc74 | 3497 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *file) |
93e14b6d | 3498 | { |
9484dc74 | 3499 | struct tun_file *tfile = file->private_data; |
93e14b6d MY |
3500 | struct tun_struct *tun; |
3501 | struct ifreq ifr; | |
3502 | ||
3503 | memset(&ifr, 0, sizeof(ifr)); | |
3504 | ||
3505 | rtnl_lock(); | |
9484dc74 | 3506 | tun = tun_get(tfile); |
93e14b6d | 3507 | if (tun) |
12132768 | 3508 | tun_get_iff(tun, &ifr); |
93e14b6d MY |
3509 | rtnl_unlock(); |
3510 | ||
3511 | if (tun) | |
3512 | tun_put(tun); | |
3513 | ||
a3816ab0 | 3514 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
3515 | } |
3516 | #endif | |
3517 | ||
d54b1fdb | 3518 | static const struct file_operations tun_fops = { |
6aa20a22 | 3519 | .owner = THIS_MODULE, |
1da177e4 | 3520 | .llseek = no_llseek, |
9b067034 | 3521 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 3522 | .write_iter = tun_chr_write_iter, |
1da177e4 | 3523 | .poll = tun_chr_poll, |
50857e2a AB |
3524 | .unlocked_ioctl = tun_chr_ioctl, |
3525 | #ifdef CONFIG_COMPAT | |
3526 | .compat_ioctl = tun_chr_compat_ioctl, | |
3527 | #endif | |
1da177e4 LT |
3528 | .open = tun_chr_open, |
3529 | .release = tun_chr_close, | |
93e14b6d MY |
3530 | .fasync = tun_chr_fasync, |
3531 | #ifdef CONFIG_PROC_FS | |
3532 | .show_fdinfo = tun_chr_show_fdinfo, | |
3533 | #endif | |
1da177e4 LT |
3534 | }; |
3535 | ||
3536 | static struct miscdevice tun_miscdev = { | |
3537 | .minor = TUN_MINOR, | |
3538 | .name = "tun", | |
e454cea2 | 3539 | .nodename = "net/tun", |
1da177e4 | 3540 | .fops = &tun_fops, |
1da177e4 LT |
3541 | }; |
3542 | ||
3543 | /* ethtool interface */ | |
3544 | ||
4e24f2dd CW |
3545 | static void tun_default_link_ksettings(struct net_device *dev, |
3546 | struct ethtool_link_ksettings *cmd) | |
29ccc49d PR |
3547 | { |
3548 | ethtool_link_ksettings_zero_link_mode(cmd, supported); | |
3549 | ethtool_link_ksettings_zero_link_mode(cmd, advertising); | |
598d2982 | 3550 | cmd->base.speed = SPEED_10000; |
29ccc49d PR |
3551 | cmd->base.duplex = DUPLEX_FULL; |
3552 | cmd->base.port = PORT_TP; | |
3553 | cmd->base.phy_address = 0; | |
3554 | cmd->base.autoneg = AUTONEG_DISABLE; | |
4e24f2dd CW |
3555 | } |
3556 | ||
3557 | static int tun_get_link_ksettings(struct net_device *dev, | |
3558 | struct ethtool_link_ksettings *cmd) | |
3559 | { | |
3560 | struct tun_struct *tun = netdev_priv(dev); | |
3561 | ||
3562 | memcpy(cmd, &tun->link_ksettings, sizeof(*cmd)); | |
3563 | return 0; | |
3564 | } | |
3565 | ||
3566 | static int tun_set_link_ksettings(struct net_device *dev, | |
3567 | const struct ethtool_link_ksettings *cmd) | |
3568 | { | |
3569 | struct tun_struct *tun = netdev_priv(dev); | |
3570 | ||
3571 | memcpy(&tun->link_ksettings, cmd, sizeof(*cmd)); | |
1da177e4 LT |
3572 | return 0; |
3573 | } | |
3574 | ||
3575 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
3576 | { | |
3577 | struct tun_struct *tun = netdev_priv(dev); | |
3578 | ||
fb3ceec1 WS |
3579 | strscpy(info->driver, DRV_NAME, sizeof(info->driver)); |
3580 | strscpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
3581 | |
3582 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 3583 | case IFF_TUN: |
fb3ceec1 | 3584 | strscpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 3585 | break; |
40630b82 | 3586 | case IFF_TAP: |
fb3ceec1 | 3587 | strscpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
3588 | break; |
3589 | } | |
3590 | } | |
3591 | ||
3592 | static u32 tun_get_msglevel(struct net_device *dev) | |
3593 | { | |
1da177e4 | 3594 | struct tun_struct *tun = netdev_priv(dev); |
3424170f MK |
3595 | |
3596 | return tun->msg_enable; | |
1da177e4 LT |
3597 | } |
3598 | ||
3599 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
3600 | { | |
1da177e4 | 3601 | struct tun_struct *tun = netdev_priv(dev); |
3424170f MK |
3602 | |
3603 | tun->msg_enable = value; | |
1da177e4 LT |
3604 | } |
3605 | ||
5503fcec | 3606 | static int tun_get_coalesce(struct net_device *dev, |
f3ccfda1 YM |
3607 | struct ethtool_coalesce *ec, |
3608 | struct kernel_ethtool_coalesce *kernel_coal, | |
3609 | struct netlink_ext_ack *extack) | |
5503fcec JW |
3610 | { |
3611 | struct tun_struct *tun = netdev_priv(dev); | |
3612 | ||
3613 | ec->rx_max_coalesced_frames = tun->rx_batched; | |
3614 | ||
3615 | return 0; | |
3616 | } | |
3617 | ||
3618 | static int tun_set_coalesce(struct net_device *dev, | |
f3ccfda1 YM |
3619 | struct ethtool_coalesce *ec, |
3620 | struct kernel_ethtool_coalesce *kernel_coal, | |
3621 | struct netlink_ext_ack *extack) | |
5503fcec JW |
3622 | { |
3623 | struct tun_struct *tun = netdev_priv(dev); | |
3624 | ||
3625 | if (ec->rx_max_coalesced_frames > NAPI_POLL_WEIGHT) | |
3626 | tun->rx_batched = NAPI_POLL_WEIGHT; | |
3627 | else | |
3628 | tun->rx_batched = ec->rx_max_coalesced_frames; | |
3629 | ||
3630 | return 0; | |
3631 | } | |
3632 | ||
7282d491 | 3633 | static const struct ethtool_ops tun_ethtool_ops = { |
e5ad00b3 | 3634 | .supported_coalesce_params = ETHTOOL_COALESCE_RX_MAX_FRAMES, |
1da177e4 LT |
3635 | .get_drvinfo = tun_get_drvinfo, |
3636 | .get_msglevel = tun_get_msglevel, | |
3637 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 3638 | .get_link = ethtool_op_get_link, |
eda29772 | 3639 | .get_ts_info = ethtool_op_get_ts_info, |
5503fcec JW |
3640 | .get_coalesce = tun_get_coalesce, |
3641 | .set_coalesce = tun_set_coalesce, | |
29ccc49d | 3642 | .get_link_ksettings = tun_get_link_ksettings, |
4e24f2dd | 3643 | .set_link_ksettings = tun_set_link_ksettings, |
1da177e4 LT |
3644 | }; |
3645 | ||
1576d986 JW |
3646 | static int tun_queue_resize(struct tun_struct *tun) |
3647 | { | |
3648 | struct net_device *dev = tun->dev; | |
3649 | struct tun_file *tfile; | |
5990a305 | 3650 | struct ptr_ring **rings; |
1576d986 JW |
3651 | int n = tun->numqueues + tun->numdisabled; |
3652 | int ret, i; | |
3653 | ||
5990a305 JW |
3654 | rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL); |
3655 | if (!rings) | |
1576d986 JW |
3656 | return -ENOMEM; |
3657 | ||
3658 | for (i = 0; i < tun->numqueues; i++) { | |
3659 | tfile = rtnl_dereference(tun->tfiles[i]); | |
5990a305 | 3660 | rings[i] = &tfile->tx_ring; |
1576d986 JW |
3661 | } |
3662 | list_for_each_entry(tfile, &tun->disabled, next) | |
5990a305 | 3663 | rings[i++] = &tfile->tx_ring; |
1576d986 | 3664 | |
5990a305 JW |
3665 | ret = ptr_ring_resize_multiple(rings, n, |
3666 | dev->tx_queue_len, GFP_KERNEL, | |
fc72d1d5 | 3667 | tun_ptr_free); |
1576d986 | 3668 | |
5990a305 | 3669 | kfree(rings); |
1576d986 JW |
3670 | return ret; |
3671 | } | |
3672 | ||
3673 | static int tun_device_event(struct notifier_block *unused, | |
3674 | unsigned long event, void *ptr) | |
3675 | { | |
3676 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3677 | struct tun_struct *tun = netdev_priv(dev); | |
72b319dc | 3678 | int i; |
1576d986 | 3679 | |
86dfb4ac CG |
3680 | if (dev->rtnl_link_ops != &tun_link_ops) |
3681 | return NOTIFY_DONE; | |
3682 | ||
1576d986 JW |
3683 | switch (event) { |
3684 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
3685 | if (tun_queue_resize(tun)) | |
3686 | return NOTIFY_BAD; | |
3687 | break; | |
72b319dc FL |
3688 | case NETDEV_UP: |
3689 | for (i = 0; i < tun->numqueues; i++) { | |
3690 | struct tun_file *tfile; | |
3691 | ||
3692 | tfile = rtnl_dereference(tun->tfiles[i]); | |
3693 | tfile->socket.sk->sk_write_space(tfile->socket.sk); | |
3694 | } | |
3695 | break; | |
1576d986 JW |
3696 | default: |
3697 | break; | |
3698 | } | |
3699 | ||
3700 | return NOTIFY_DONE; | |
3701 | } | |
3702 | ||
3703 | static struct notifier_block tun_notifier_block __read_mostly = { | |
3704 | .notifier_call = tun_device_event, | |
3705 | }; | |
79d17604 | 3706 | |
1da177e4 LT |
3707 | static int __init tun_init(void) |
3708 | { | |
3709 | int ret = 0; | |
3710 | ||
6b8a66ee | 3711 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1da177e4 | 3712 | |
f019a7a5 | 3713 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 3714 | if (ret) { |
6b8a66ee | 3715 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 3716 | goto err_linkops; |
79d17604 PE |
3717 | } |
3718 | ||
1da177e4 | 3719 | ret = misc_register(&tun_miscdev); |
79d17604 | 3720 | if (ret) { |
6b8a66ee | 3721 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
3722 | goto err_misc; |
3723 | } | |
1576d986 | 3724 | |
5edfbd3c TZ |
3725 | ret = register_netdevice_notifier(&tun_notifier_block); |
3726 | if (ret) { | |
3727 | pr_err("Can't register netdevice notifier\n"); | |
3728 | goto err_notifier; | |
3729 | } | |
3730 | ||
f019a7a5 | 3731 | return 0; |
5edfbd3c TZ |
3732 | |
3733 | err_notifier: | |
3734 | misc_deregister(&tun_miscdev); | |
79d17604 | 3735 | err_misc: |
f019a7a5 EB |
3736 | rtnl_link_unregister(&tun_link_ops); |
3737 | err_linkops: | |
1da177e4 LT |
3738 | return ret; |
3739 | } | |
3740 | ||
3741 | static void tun_cleanup(void) | |
3742 | { | |
6aa20a22 | 3743 | misc_deregister(&tun_miscdev); |
f019a7a5 | 3744 | rtnl_link_unregister(&tun_link_ops); |
1576d986 | 3745 | unregister_netdevice_notifier(&tun_notifier_block); |
1da177e4 LT |
3746 | } |
3747 | ||
05c2828c MT |
3748 | /* Get an underlying socket object from tun file. Returns error unless file is |
3749 | * attached to a device. The returned object works like a packet socket, it | |
3750 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
3751 | * holding a reference to the file for as long as the socket is in use. */ | |
3752 | struct socket *tun_get_socket(struct file *file) | |
3753 | { | |
6e914fc7 | 3754 | struct tun_file *tfile; |
05c2828c MT |
3755 | if (file->f_op != &tun_fops) |
3756 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
3757 | tfile = file->private_data; |
3758 | if (!tfile) | |
05c2828c | 3759 | return ERR_PTR(-EBADFD); |
54f968d6 | 3760 | return &tfile->socket; |
05c2828c MT |
3761 | } |
3762 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
3763 | ||
5990a305 | 3764 | struct ptr_ring *tun_get_tx_ring(struct file *file) |
83339c6b JW |
3765 | { |
3766 | struct tun_file *tfile; | |
3767 | ||
3768 | if (file->f_op != &tun_fops) | |
3769 | return ERR_PTR(-EINVAL); | |
3770 | tfile = file->private_data; | |
3771 | if (!tfile) | |
3772 | return ERR_PTR(-EBADFD); | |
5990a305 | 3773 | return &tfile->tx_ring; |
83339c6b | 3774 | } |
5990a305 | 3775 | EXPORT_SYMBOL_GPL(tun_get_tx_ring); |
83339c6b | 3776 | |
1da177e4 LT |
3777 | module_init(tun_init); |
3778 | module_exit(tun_cleanup); | |
3779 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
3780 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
3781 | MODULE_LICENSE("GPL"); | |
3782 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 3783 | MODULE_ALIAS("devname:net/tun"); |