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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
344dc8ed | 25 | * Use eth_random_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
6b8a66ee JP |
37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
38 | ||
1da177e4 LT |
39 | #define DRV_NAME "tun" |
40 | #define DRV_VERSION "1.6" | |
41 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
42 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/errno.h> | |
46 | #include <linux/kernel.h> | |
174cd4b1 | 47 | #include <linux/sched/signal.h> |
1da177e4 LT |
48 | #include <linux/major.h> |
49 | #include <linux/slab.h> | |
50 | #include <linux/poll.h> | |
51 | #include <linux/fcntl.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/skbuff.h> | |
54 | #include <linux/netdevice.h> | |
55 | #include <linux/etherdevice.h> | |
56 | #include <linux/miscdevice.h> | |
57 | #include <linux/ethtool.h> | |
58 | #include <linux/rtnetlink.h> | |
50857e2a | 59 | #include <linux/compat.h> |
1da177e4 LT |
60 | #include <linux/if.h> |
61 | #include <linux/if_arp.h> | |
62 | #include <linux/if_ether.h> | |
63 | #include <linux/if_tun.h> | |
6680ec68 | 64 | #include <linux/if_vlan.h> |
1da177e4 | 65 | #include <linux/crc32.h> |
d647a591 | 66 | #include <linux/nsproxy.h> |
f43798c2 | 67 | #include <linux/virtio_net.h> |
99405162 | 68 | #include <linux/rcupdate.h> |
881d966b | 69 | #include <net/net_namespace.h> |
79d17604 | 70 | #include <net/netns/generic.h> |
f019a7a5 | 71 | #include <net/rtnetlink.h> |
33dccbb0 | 72 | #include <net/sock.h> |
735fc405 | 73 | #include <net/xdp.h> |
93e14b6d | 74 | #include <linux/seq_file.h> |
e0b46d0e | 75 | #include <linux/uio.h> |
1576d986 | 76 | #include <linux/skb_array.h> |
761876c8 JW |
77 | #include <linux/bpf.h> |
78 | #include <linux/bpf_trace.h> | |
90e33d45 | 79 | #include <linux/mutex.h> |
1da177e4 | 80 | |
7c0f6ba6 | 81 | #include <linux/uaccess.h> |
f2780d6d | 82 | #include <linux/proc_fs.h> |
1da177e4 | 83 | |
4e24f2dd CW |
84 | static void tun_default_link_ksettings(struct net_device *dev, |
85 | struct ethtool_link_ksettings *cmd); | |
86 | ||
14daa021 RR |
87 | /* Uncomment to enable debugging */ |
88 | /* #define TUN_DEBUG 1 */ | |
89 | ||
1da177e4 LT |
90 | #ifdef TUN_DEBUG |
91 | static int debug; | |
14daa021 | 92 | |
6b8a66ee JP |
93 | #define tun_debug(level, tun, fmt, args...) \ |
94 | do { \ | |
95 | if (tun->debug) \ | |
96 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
97 | } while (0) | |
98 | #define DBG1(level, fmt, args...) \ | |
99 | do { \ | |
100 | if (debug == 2) \ | |
101 | printk(level fmt, ##args); \ | |
102 | } while (0) | |
14daa021 | 103 | #else |
6b8a66ee JP |
104 | #define tun_debug(level, tun, fmt, args...) \ |
105 | do { \ | |
106 | if (0) \ | |
107 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
108 | } while (0) | |
109 | #define DBG1(level, fmt, args...) \ | |
110 | do { \ | |
111 | if (0) \ | |
112 | printk(level fmt, ##args); \ | |
113 | } while (0) | |
14daa021 RR |
114 | #endif |
115 | ||
7df13219 | 116 | #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
66ccbc9c | 117 | |
031f5e03 MT |
118 | /* TUN device flags */ |
119 | ||
120 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
121 | * overload it to mean fasync when stored there. | |
122 | */ | |
123 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
124 | /* High bits in flags field are unused. */ |
125 | #define TUN_VNET_LE 0x80000000 | |
8b8e658b | 126 | #define TUN_VNET_BE 0x40000000 |
031f5e03 MT |
127 | |
128 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
90e33d45 PP |
129 | IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS) |
130 | ||
0690899b MT |
131 | #define GOODCOPY_LEN 128 |
132 | ||
f271b2cc MK |
133 | #define FLT_EXACT_COUNT 8 |
134 | struct tap_filter { | |
135 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
136 | u32 mask[2]; /* Mask of the hashed addrs */ | |
137 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
138 | }; | |
139 | ||
baf71c5c PG |
140 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
141 | * to max number of VCPUs in guest. */ | |
142 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 143 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 144 | |
96442e42 JW |
145 | #define TUN_FLOW_EXPIRE (3 * HZ) |
146 | ||
608b9977 PA |
147 | struct tun_pcpu_stats { |
148 | u64 rx_packets; | |
149 | u64 rx_bytes; | |
150 | u64 tx_packets; | |
151 | u64 tx_bytes; | |
152 | struct u64_stats_sync syncp; | |
153 | u32 rx_dropped; | |
154 | u32 tx_dropped; | |
155 | u32 rx_frame_errors; | |
156 | }; | |
157 | ||
54f968d6 | 158 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 159 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
160 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
161 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 162 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 163 | * this). |
6e914fc7 JW |
164 | * |
165 | * RCU usage: | |
36fe8c09 | 166 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 167 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 168 | */ |
631ab46b | 169 | struct tun_file { |
54f968d6 JW |
170 | struct sock sk; |
171 | struct socket socket; | |
172 | struct socket_wq wq; | |
6e914fc7 | 173 | struct tun_struct __rcu *tun; |
54f968d6 JW |
174 | struct fasync_struct *fasync; |
175 | /* only used for fasnyc */ | |
176 | unsigned int flags; | |
fb7589a1 PE |
177 | union { |
178 | u16 queue_index; | |
179 | unsigned int ifindex; | |
180 | }; | |
94317099 | 181 | struct napi_struct napi; |
aec72f33 | 182 | bool napi_enabled; |
af3fb24e | 183 | bool napi_frags_enabled; |
90e33d45 | 184 | struct mutex napi_mutex; /* Protects access to the above napi */ |
4008e97f JW |
185 | struct list_head next; |
186 | struct tun_struct *detached; | |
5990a305 | 187 | struct ptr_ring tx_ring; |
8bf5c4ee | 188 | struct xdp_rxq_info xdp_rxq; |
631ab46b EB |
189 | }; |
190 | ||
96442e42 JW |
191 | struct tun_flow_entry { |
192 | struct hlist_node hash_link; | |
193 | struct rcu_head rcu; | |
194 | struct tun_struct *tun; | |
195 | ||
196 | u32 rxhash; | |
9bc88939 | 197 | u32 rps_rxhash; |
96442e42 JW |
198 | int queue_index; |
199 | unsigned long updated; | |
200 | }; | |
201 | ||
202 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
f13b5468 | 203 | #define TUN_MASK_FLOW_ENTRIES (TUN_NUM_FLOW_ENTRIES - 1) |
96442e42 | 204 | |
cd5681d7 | 205 | struct tun_prog { |
96f84061 JW |
206 | struct rcu_head rcu; |
207 | struct bpf_prog *prog; | |
208 | }; | |
209 | ||
54f968d6 | 210 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 211 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
212 | * file were attached to a persist device. |
213 | */ | |
14daa021 | 214 | struct tun_struct { |
c8d68e6b JW |
215 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
216 | unsigned int numqueues; | |
f271b2cc | 217 | unsigned int flags; |
0625c883 EB |
218 | kuid_t owner; |
219 | kgid_t group; | |
14daa021 | 220 | |
14daa021 | 221 | struct net_device *dev; |
c8f44aff | 222 | netdev_features_t set_features; |
88255375 | 223 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
d591a1f3 | 224 | NETIF_F_TSO6) |
d9d52b51 | 225 | |
eaea34b2 | 226 | int align; |
d9d52b51 | 227 | int vnet_hdr_sz; |
54f968d6 JW |
228 | int sndbuf; |
229 | struct tap_filter txflt; | |
230 | struct sock_fprog fprog; | |
231 | /* protected by rtnl lock */ | |
232 | bool filter_attached; | |
14daa021 RR |
233 | #ifdef TUN_DEBUG |
234 | int debug; | |
1da177e4 | 235 | #endif |
96442e42 | 236 | spinlock_t lock; |
96442e42 JW |
237 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
238 | struct timer_list flow_gc_timer; | |
239 | unsigned long ageing_time; | |
4008e97f JW |
240 | unsigned int numdisabled; |
241 | struct list_head disabled; | |
5dbbaf2d | 242 | void *security; |
b8732fb7 | 243 | u32 flow_count; |
5503fcec | 244 | u32 rx_batched; |
608b9977 | 245 | struct tun_pcpu_stats __percpu *pcpu_stats; |
761876c8 | 246 | struct bpf_prog __rcu *xdp_prog; |
cd5681d7 | 247 | struct tun_prog __rcu *steering_prog; |
aff3d70a | 248 | struct tun_prog __rcu *filter_prog; |
4e24f2dd | 249 | struct ethtool_link_ksettings link_ksettings; |
14daa021 | 250 | }; |
1da177e4 | 251 | |
aff3d70a JW |
252 | struct veth { |
253 | __be16 h_vlan_proto; | |
254 | __be16 h_vlan_TCI; | |
14daa021 | 255 | }; |
1da177e4 | 256 | |
1ffcbc85 | 257 | bool tun_is_xdp_frame(void *ptr) |
fc72d1d5 JW |
258 | { |
259 | return (unsigned long)ptr & TUN_XDP_FLAG; | |
260 | } | |
1ffcbc85 | 261 | EXPORT_SYMBOL(tun_is_xdp_frame); |
fc72d1d5 JW |
262 | |
263 | void *tun_xdp_to_ptr(void *ptr) | |
264 | { | |
265 | return (void *)((unsigned long)ptr | TUN_XDP_FLAG); | |
266 | } | |
267 | EXPORT_SYMBOL(tun_xdp_to_ptr); | |
268 | ||
269 | void *tun_ptr_to_xdp(void *ptr) | |
270 | { | |
271 | return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG); | |
272 | } | |
273 | EXPORT_SYMBOL(tun_ptr_to_xdp); | |
274 | ||
94317099 PP |
275 | static int tun_napi_receive(struct napi_struct *napi, int budget) |
276 | { | |
277 | struct tun_file *tfile = container_of(napi, struct tun_file, napi); | |
278 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
279 | struct sk_buff_head process_queue; | |
280 | struct sk_buff *skb; | |
281 | int received = 0; | |
282 | ||
283 | __skb_queue_head_init(&process_queue); | |
284 | ||
285 | spin_lock(&queue->lock); | |
286 | skb_queue_splice_tail_init(queue, &process_queue); | |
287 | spin_unlock(&queue->lock); | |
288 | ||
289 | while (received < budget && (skb = __skb_dequeue(&process_queue))) { | |
290 | napi_gro_receive(napi, skb); | |
291 | ++received; | |
292 | } | |
293 | ||
294 | if (!skb_queue_empty(&process_queue)) { | |
295 | spin_lock(&queue->lock); | |
296 | skb_queue_splice(&process_queue, queue); | |
297 | spin_unlock(&queue->lock); | |
298 | } | |
299 | ||
300 | return received; | |
301 | } | |
302 | ||
303 | static int tun_napi_poll(struct napi_struct *napi, int budget) | |
304 | { | |
305 | unsigned int received; | |
306 | ||
307 | received = tun_napi_receive(napi, budget); | |
308 | ||
309 | if (received < budget) | |
310 | napi_complete_done(napi, received); | |
311 | ||
312 | return received; | |
313 | } | |
314 | ||
315 | static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile, | |
af3fb24e | 316 | bool napi_en, bool napi_frags) |
94317099 | 317 | { |
aec72f33 | 318 | tfile->napi_enabled = napi_en; |
af3fb24e | 319 | tfile->napi_frags_enabled = napi_en && napi_frags; |
94317099 PP |
320 | if (napi_en) { |
321 | netif_napi_add(tun->dev, &tfile->napi, tun_napi_poll, | |
322 | NAPI_POLL_WEIGHT); | |
323 | napi_enable(&tfile->napi); | |
324 | } | |
325 | } | |
326 | ||
06e55add | 327 | static void tun_napi_disable(struct tun_file *tfile) |
94317099 | 328 | { |
aec72f33 | 329 | if (tfile->napi_enabled) |
94317099 PP |
330 | napi_disable(&tfile->napi); |
331 | } | |
332 | ||
06e55add | 333 | static void tun_napi_del(struct tun_file *tfile) |
94317099 | 334 | { |
aec72f33 | 335 | if (tfile->napi_enabled) |
94317099 PP |
336 | netif_napi_del(&tfile->napi); |
337 | } | |
338 | ||
af3fb24e | 339 | static bool tun_napi_frags_enabled(const struct tun_file *tfile) |
90e33d45 | 340 | { |
af3fb24e | 341 | return tfile->napi_frags_enabled; |
90e33d45 PP |
342 | } |
343 | ||
8b8e658b GK |
344 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
345 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
346 | { | |
347 | return tun->flags & TUN_VNET_BE ? false : | |
348 | virtio_legacy_is_little_endian(); | |
349 | } | |
350 | ||
351 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
352 | { | |
353 | int be = !!(tun->flags & TUN_VNET_BE); | |
354 | ||
355 | if (put_user(be, argp)) | |
356 | return -EFAULT; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
362 | { | |
363 | int be; | |
364 | ||
365 | if (get_user(be, argp)) | |
366 | return -EFAULT; | |
367 | ||
368 | if (be) | |
369 | tun->flags |= TUN_VNET_BE; | |
370 | else | |
371 | tun->flags &= ~TUN_VNET_BE; | |
372 | ||
373 | return 0; | |
374 | } | |
375 | #else | |
376 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
377 | { | |
378 | return virtio_legacy_is_little_endian(); | |
379 | } | |
380 | ||
381 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
382 | { | |
383 | return -EINVAL; | |
384 | } | |
385 | ||
386 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
387 | { | |
388 | return -EINVAL; | |
389 | } | |
390 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
391 | ||
25bd55bb GK |
392 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
393 | { | |
7d824109 | 394 | return tun->flags & TUN_VNET_LE || |
8b8e658b | 395 | tun_legacy_is_little_endian(tun); |
25bd55bb GK |
396 | } |
397 | ||
56f0dcc5 MT |
398 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
399 | { | |
25bd55bb | 400 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
401 | } |
402 | ||
403 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
404 | { | |
25bd55bb | 405 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
406 | } |
407 | ||
96442e42 JW |
408 | static inline u32 tun_hashfn(u32 rxhash) |
409 | { | |
f13b5468 | 410 | return rxhash & TUN_MASK_FLOW_ENTRIES; |
96442e42 JW |
411 | } |
412 | ||
413 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
414 | { | |
415 | struct tun_flow_entry *e; | |
96442e42 | 416 | |
b67bfe0d | 417 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
418 | if (e->rxhash == rxhash) |
419 | return e; | |
420 | } | |
421 | return NULL; | |
422 | } | |
423 | ||
424 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
425 | struct hlist_head *head, | |
426 | u32 rxhash, u16 queue_index) | |
427 | { | |
9fdc6bef ED |
428 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
429 | ||
96442e42 JW |
430 | if (e) { |
431 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
432 | rxhash, queue_index); | |
433 | e->updated = jiffies; | |
434 | e->rxhash = rxhash; | |
9bc88939 | 435 | e->rps_rxhash = 0; |
96442e42 JW |
436 | e->queue_index = queue_index; |
437 | e->tun = tun; | |
438 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 439 | ++tun->flow_count; |
96442e42 JW |
440 | } |
441 | return e; | |
442 | } | |
443 | ||
96442e42 JW |
444 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
445 | { | |
446 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
447 | e->rxhash, e->queue_index); | |
448 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 449 | kfree_rcu(e, rcu); |
b8732fb7 | 450 | --tun->flow_count; |
96442e42 JW |
451 | } |
452 | ||
453 | static void tun_flow_flush(struct tun_struct *tun) | |
454 | { | |
455 | int i; | |
456 | ||
457 | spin_lock_bh(&tun->lock); | |
458 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
459 | struct tun_flow_entry *e; | |
b67bfe0d | 460 | struct hlist_node *n; |
96442e42 | 461 | |
b67bfe0d | 462 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
463 | tun_flow_delete(tun, e); |
464 | } | |
465 | spin_unlock_bh(&tun->lock); | |
466 | } | |
467 | ||
468 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
469 | { | |
470 | int i; | |
471 | ||
472 | spin_lock_bh(&tun->lock); | |
473 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
474 | struct tun_flow_entry *e; | |
b67bfe0d | 475 | struct hlist_node *n; |
96442e42 | 476 | |
b67bfe0d | 477 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
478 | if (e->queue_index == queue_index) |
479 | tun_flow_delete(tun, e); | |
480 | } | |
481 | } | |
482 | spin_unlock_bh(&tun->lock); | |
483 | } | |
484 | ||
e99e88a9 | 485 | static void tun_flow_cleanup(struct timer_list *t) |
96442e42 | 486 | { |
e99e88a9 | 487 | struct tun_struct *tun = from_timer(tun, t, flow_gc_timer); |
96442e42 JW |
488 | unsigned long delay = tun->ageing_time; |
489 | unsigned long next_timer = jiffies + delay; | |
490 | unsigned long count = 0; | |
491 | int i; | |
492 | ||
493 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
494 | ||
7dbfb4ef | 495 | spin_lock(&tun->lock); |
96442e42 JW |
496 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
497 | struct tun_flow_entry *e; | |
b67bfe0d | 498 | struct hlist_node *n; |
96442e42 | 499 | |
b67bfe0d | 500 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 | 501 | unsigned long this_timer; |
81d98fa4 | 502 | |
96442e42 | 503 | this_timer = e->updated + delay; |
81d98fa4 | 504 | if (time_before_eq(this_timer, jiffies)) { |
96442e42 | 505 | tun_flow_delete(tun, e); |
81d98fa4 ED |
506 | continue; |
507 | } | |
508 | count++; | |
509 | if (time_before(this_timer, next_timer)) | |
96442e42 JW |
510 | next_timer = this_timer; |
511 | } | |
512 | } | |
513 | ||
514 | if (count) | |
515 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
7dbfb4ef | 516 | spin_unlock(&tun->lock); |
96442e42 JW |
517 | } |
518 | ||
49974420 | 519 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 520 | struct tun_file *tfile) |
96442e42 JW |
521 | { |
522 | struct hlist_head *head; | |
523 | struct tun_flow_entry *e; | |
524 | unsigned long delay = tun->ageing_time; | |
9e85722d | 525 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
526 | |
527 | if (!rxhash) | |
528 | return; | |
529 | else | |
530 | head = &tun->flows[tun_hashfn(rxhash)]; | |
531 | ||
532 | rcu_read_lock(); | |
533 | ||
96442e42 JW |
534 | e = tun_flow_find(head, rxhash); |
535 | if (likely(e)) { | |
536 | /* TODO: keep queueing to old queue until it's empty? */ | |
537 | e->queue_index = queue_index; | |
538 | e->updated = jiffies; | |
9bc88939 | 539 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
540 | } else { |
541 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
542 | if (!tun_flow_find(head, rxhash) && |
543 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
544 | tun_flow_create(tun, head, rxhash, queue_index); |
545 | ||
546 | if (!timer_pending(&tun->flow_gc_timer)) | |
547 | mod_timer(&tun->flow_gc_timer, | |
548 | round_jiffies_up(jiffies + delay)); | |
549 | spin_unlock_bh(&tun->lock); | |
550 | } | |
551 | ||
96442e42 JW |
552 | rcu_read_unlock(); |
553 | } | |
554 | ||
9bc88939 TH |
555 | /** |
556 | * Save the hash received in the stack receive path and update the | |
557 | * flow_hash table accordingly. | |
558 | */ | |
559 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
560 | { | |
567e4b79 | 561 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 562 | e->rps_rxhash = hash; |
9bc88939 TH |
563 | } |
564 | ||
c8d68e6b | 565 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 566 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
567 | * the rxq based on the txq where the last packet of the flow comes. As |
568 | * the userspace application move between processors, we may get a | |
569 | * different rxq no. here. If we could not get rxhash, then we would | |
570 | * hope the rxq no. may help here. | |
571 | */ | |
96f84061 | 572 | static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
c8d68e6b | 573 | { |
96442e42 | 574 | struct tun_flow_entry *e; |
c8d68e6b JW |
575 | u32 txq = 0; |
576 | u32 numqueues = 0; | |
577 | ||
6aa7de05 | 578 | numqueues = READ_ONCE(tun->numqueues); |
c8d68e6b | 579 | |
feec084a | 580 | txq = __skb_get_hash_symmetric(skb); |
c8d68e6b | 581 | if (txq) { |
96442e42 | 582 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 583 | if (e) { |
9bc88939 | 584 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 585 | txq = e->queue_index; |
9bc88939 | 586 | } else |
96442e42 JW |
587 | /* use multiply and shift instead of expensive divide */ |
588 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
589 | } else if (likely(skb_rx_queue_recorded(skb))) { |
590 | txq = skb_get_rx_queue(skb); | |
591 | while (unlikely(txq >= numqueues)) | |
592 | txq -= numqueues; | |
593 | } | |
594 | ||
c8d68e6b JW |
595 | return txq; |
596 | } | |
597 | ||
96f84061 JW |
598 | static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
599 | { | |
cd5681d7 | 600 | struct tun_prog *prog; |
96f84061 JW |
601 | u16 ret = 0; |
602 | ||
603 | prog = rcu_dereference(tun->steering_prog); | |
604 | if (prog) | |
605 | ret = bpf_prog_run_clear_cb(prog->prog, skb); | |
606 | ||
607 | return ret % tun->numqueues; | |
608 | } | |
609 | ||
610 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, | |
4f49dec9 AD |
611 | struct net_device *sb_dev, |
612 | select_queue_fallback_t fallback) | |
96f84061 JW |
613 | { |
614 | struct tun_struct *tun = netdev_priv(dev); | |
615 | u16 ret; | |
616 | ||
617 | rcu_read_lock(); | |
618 | if (rcu_dereference(tun->steering_prog)) | |
619 | ret = tun_ebpf_select_queue(tun, skb); | |
620 | else | |
621 | ret = tun_automq_select_queue(tun, skb); | |
622 | rcu_read_unlock(); | |
623 | ||
624 | return ret; | |
625 | } | |
626 | ||
cde8b15f JW |
627 | static inline bool tun_not_capable(struct tun_struct *tun) |
628 | { | |
629 | const struct cred *cred = current_cred(); | |
c260b772 | 630 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
631 | |
632 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
633 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 634 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
635 | } |
636 | ||
c8d68e6b JW |
637 | static void tun_set_real_num_queues(struct tun_struct *tun) |
638 | { | |
639 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
640 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
641 | } | |
642 | ||
4008e97f JW |
643 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
644 | { | |
645 | tfile->detached = tun; | |
646 | list_add_tail(&tfile->next, &tun->disabled); | |
647 | ++tun->numdisabled; | |
648 | } | |
649 | ||
d32649d1 | 650 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
651 | { |
652 | struct tun_struct *tun = tfile->detached; | |
653 | ||
654 | tfile->detached = NULL; | |
655 | list_del_init(&tfile->next); | |
656 | --tun->numdisabled; | |
657 | return tun; | |
658 | } | |
659 | ||
3a403076 | 660 | void tun_ptr_free(void *ptr) |
fc72d1d5 JW |
661 | { |
662 | if (!ptr) | |
663 | return; | |
1ffcbc85 JDB |
664 | if (tun_is_xdp_frame(ptr)) { |
665 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 666 | |
03993094 | 667 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
668 | } else { |
669 | __skb_array_destroy_skb(ptr); | |
670 | } | |
671 | } | |
3a403076 | 672 | EXPORT_SYMBOL_GPL(tun_ptr_free); |
fc72d1d5 | 673 | |
4bfb0513 JW |
674 | static void tun_queue_purge(struct tun_file *tfile) |
675 | { | |
fc72d1d5 | 676 | void *ptr; |
1576d986 | 677 | |
fc72d1d5 JW |
678 | while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL) |
679 | tun_ptr_free(ptr); | |
1576d986 | 680 | |
5503fcec | 681 | skb_queue_purge(&tfile->sk.sk_write_queue); |
4bfb0513 JW |
682 | skb_queue_purge(&tfile->sk.sk_error_queue); |
683 | } | |
684 | ||
c8d68e6b JW |
685 | static void __tun_detach(struct tun_file *tfile, bool clean) |
686 | { | |
687 | struct tun_file *ntfile; | |
688 | struct tun_struct *tun; | |
c8d68e6b | 689 | |
b8deabd3 JW |
690 | tun = rtnl_dereference(tfile->tun); |
691 | ||
94317099 | 692 | if (tun && clean) { |
06e55add ED |
693 | tun_napi_disable(tfile); |
694 | tun_napi_del(tfile); | |
94317099 PP |
695 | } |
696 | ||
9e85722d | 697 | if (tun && !tfile->detached) { |
c8d68e6b JW |
698 | u16 index = tfile->queue_index; |
699 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
700 | |
701 | rcu_assign_pointer(tun->tfiles[index], | |
702 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 703 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
704 | ntfile->queue_index = index; |
705 | ||
706 | --tun->numqueues; | |
9e85722d | 707 | if (clean) { |
c956674b | 708 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 709 | sock_put(&tfile->sk); |
9e85722d | 710 | } else |
4008e97f | 711 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
712 | |
713 | synchronize_net(); | |
96442e42 | 714 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 715 | /* Drop read queue */ |
4bfb0513 | 716 | tun_queue_purge(tfile); |
c8d68e6b | 717 | tun_set_real_num_queues(tun); |
dd38bd85 | 718 | } else if (tfile->detached && clean) { |
4008e97f | 719 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
720 | sock_put(&tfile->sk); |
721 | } | |
c8d68e6b JW |
722 | |
723 | if (clean) { | |
af668b3c MT |
724 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
725 | netif_carrier_off(tun->dev); | |
726 | ||
40630b82 | 727 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 728 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 729 | unregister_netdevice(tun->dev); |
af668b3c | 730 | } |
b196d88a JW |
731 | if (tun) |
732 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
7063efd3 | 733 | ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free); |
140e807d | 734 | sock_put(&tfile->sk); |
c8d68e6b JW |
735 | } |
736 | } | |
737 | ||
738 | static void tun_detach(struct tun_file *tfile, bool clean) | |
739 | { | |
83c1f36f SD |
740 | struct tun_struct *tun; |
741 | struct net_device *dev; | |
742 | ||
c8d68e6b | 743 | rtnl_lock(); |
83c1f36f SD |
744 | tun = rtnl_dereference(tfile->tun); |
745 | dev = tun ? tun->dev : NULL; | |
c8d68e6b | 746 | __tun_detach(tfile, clean); |
83c1f36f SD |
747 | if (dev) |
748 | netdev_state_change(dev); | |
c8d68e6b JW |
749 | rtnl_unlock(); |
750 | } | |
751 | ||
752 | static void tun_detach_all(struct net_device *dev) | |
753 | { | |
754 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 755 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
756 | int i, n = tun->numqueues; |
757 | ||
758 | for (i = 0; i < n; i++) { | |
b8deabd3 | 759 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 760 | BUG_ON(!tfile); |
06e55add | 761 | tun_napi_disable(tfile); |
addf8fc4 | 762 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 763 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 764 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
765 | --tun->numqueues; |
766 | } | |
9e85722d | 767 | list_for_each_entry(tfile, &tun->disabled, next) { |
addf8fc4 | 768 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 769 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 770 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 771 | } |
c8d68e6b JW |
772 | BUG_ON(tun->numqueues != 0); |
773 | ||
774 | synchronize_net(); | |
775 | for (i = 0; i < n; i++) { | |
b8deabd3 | 776 | tfile = rtnl_dereference(tun->tfiles[i]); |
06e55add | 777 | tun_napi_del(tfile); |
c8d68e6b | 778 | /* Drop read queue */ |
4bfb0513 | 779 | tun_queue_purge(tfile); |
b196d88a | 780 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
c8d68e6b JW |
781 | sock_put(&tfile->sk); |
782 | } | |
4008e97f JW |
783 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
784 | tun_enable_queue(tfile); | |
4bfb0513 | 785 | tun_queue_purge(tfile); |
b196d88a | 786 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
4008e97f JW |
787 | sock_put(&tfile->sk); |
788 | } | |
789 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 790 | |
40630b82 | 791 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 792 | module_put(THIS_MODULE); |
c8d68e6b JW |
793 | } |
794 | ||
94317099 | 795 | static int tun_attach(struct tun_struct *tun, struct file *file, |
af3fb24e | 796 | bool skip_filter, bool napi, bool napi_frags) |
a7385ba2 | 797 | { |
631ab46b | 798 | struct tun_file *tfile = file->private_data; |
1576d986 | 799 | struct net_device *dev = tun->dev; |
38231b7a | 800 | int err; |
a7385ba2 | 801 | |
5dbbaf2d PM |
802 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
803 | if (err < 0) | |
804 | goto out; | |
805 | ||
38231b7a | 806 | err = -EINVAL; |
9e85722d | 807 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
808 | goto out; |
809 | ||
810 | err = -EBUSY; | |
40630b82 | 811 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
812 | goto out; |
813 | ||
814 | err = -E2BIG; | |
4008e97f JW |
815 | if (!tfile->detached && |
816 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
817 | goto out; |
818 | ||
819 | err = 0; | |
54f968d6 | 820 | |
92d4ea6e | 821 | /* Re-attach the filter to persist device */ |
849c9b6f | 822 | if (!skip_filter && (tun->filter_attached == true)) { |
8ced425e HFS |
823 | lock_sock(tfile->socket.sk); |
824 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
825 | release_sock(tfile->socket.sk); | |
54f968d6 JW |
826 | if (!err) |
827 | goto out; | |
828 | } | |
1576d986 JW |
829 | |
830 | if (!tfile->detached && | |
b196d88a JW |
831 | ptr_ring_resize(&tfile->tx_ring, dev->tx_queue_len, |
832 | GFP_KERNEL, tun_ptr_free)) { | |
1576d986 JW |
833 | err = -ENOMEM; |
834 | goto out; | |
835 | } | |
836 | ||
c8d68e6b | 837 | tfile->queue_index = tun->numqueues; |
addf8fc4 | 838 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
8bf5c4ee JDB |
839 | |
840 | if (tfile->detached) { | |
841 | /* Re-attach detached tfile, updating XDP queue_index */ | |
842 | WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq)); | |
843 | ||
844 | if (tfile->xdp_rxq.queue_index != tfile->queue_index) | |
845 | tfile->xdp_rxq.queue_index = tfile->queue_index; | |
846 | } else { | |
847 | /* Setup XDP RX-queue info, for new tfile getting attached */ | |
848 | err = xdp_rxq_info_reg(&tfile->xdp_rxq, | |
849 | tun->dev, tfile->queue_index); | |
850 | if (err < 0) | |
851 | goto out; | |
8d5d8852 JDB |
852 | err = xdp_rxq_info_reg_mem_model(&tfile->xdp_rxq, |
853 | MEM_TYPE_PAGE_SHARED, NULL); | |
854 | if (err < 0) { | |
855 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
856 | goto out; | |
857 | } | |
8bf5c4ee JDB |
858 | err = 0; |
859 | } | |
860 | ||
6e914fc7 | 861 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 862 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 863 | tun->numqueues++; |
a7385ba2 | 864 | |
94317099 | 865 | if (tfile->detached) { |
4008e97f | 866 | tun_enable_queue(tfile); |
94317099 | 867 | } else { |
4008e97f | 868 | sock_hold(&tfile->sk); |
af3fb24e | 869 | tun_napi_init(tun, tfile, napi, napi_frags); |
94317099 | 870 | } |
4008e97f | 871 | |
e4a2a304 JW |
872 | if (rtnl_dereference(tun->xdp_prog)) |
873 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
874 | ||
c8d68e6b | 875 | tun_set_real_num_queues(tun); |
a7385ba2 | 876 | |
c8d68e6b JW |
877 | /* device is allowed to go away first, so no need to hold extra |
878 | * refcnt. | |
879 | */ | |
880 | ||
881 | out: | |
882 | return err; | |
631ab46b EB |
883 | } |
884 | ||
9484dc74 | 885 | static struct tun_struct *tun_get(struct tun_file *tfile) |
631ab46b | 886 | { |
6e914fc7 | 887 | struct tun_struct *tun; |
c70f1829 | 888 | |
6e914fc7 JW |
889 | rcu_read_lock(); |
890 | tun = rcu_dereference(tfile->tun); | |
891 | if (tun) | |
892 | dev_hold(tun->dev); | |
893 | rcu_read_unlock(); | |
c70f1829 EB |
894 | |
895 | return tun; | |
631ab46b EB |
896 | } |
897 | ||
631ab46b EB |
898 | static void tun_put(struct tun_struct *tun) |
899 | { | |
6e914fc7 | 900 | dev_put(tun->dev); |
631ab46b EB |
901 | } |
902 | ||
6b8a66ee | 903 | /* TAP filtering */ |
f271b2cc MK |
904 | static void addr_hash_set(u32 *mask, const u8 *addr) |
905 | { | |
906 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
907 | mask[n >> 5] |= (1 << (n & 31)); | |
908 | } | |
909 | ||
910 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
911 | { | |
912 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
913 | return mask[n >> 5] & (1 << (n & 31)); | |
914 | } | |
915 | ||
916 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
917 | { | |
918 | struct { u8 u[ETH_ALEN]; } *addr; | |
919 | struct tun_filter uf; | |
920 | int err, alen, n, nexact; | |
921 | ||
922 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
923 | return -EFAULT; | |
924 | ||
925 | if (!uf.count) { | |
926 | /* Disabled */ | |
927 | filter->count = 0; | |
928 | return 0; | |
929 | } | |
930 | ||
931 | alen = ETH_ALEN * uf.count; | |
28e8190d ME |
932 | addr = memdup_user(arg + sizeof(uf), alen); |
933 | if (IS_ERR(addr)) | |
934 | return PTR_ERR(addr); | |
f271b2cc MK |
935 | |
936 | /* The filter is updated without holding any locks. Which is | |
937 | * perfectly safe. We disable it first and in the worst | |
938 | * case we'll accept a few undesired packets. */ | |
939 | filter->count = 0; | |
940 | wmb(); | |
941 | ||
942 | /* Use first set of addresses as an exact filter */ | |
943 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
944 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
945 | ||
946 | nexact = n; | |
947 | ||
cfbf84fc AW |
948 | /* Remaining multicast addresses are hashed, |
949 | * unicast will leave the filter disabled. */ | |
f271b2cc | 950 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
951 | for (; n < uf.count; n++) { |
952 | if (!is_multicast_ether_addr(addr[n].u)) { | |
953 | err = 0; /* no filter */ | |
3b8d2a69 | 954 | goto free_addr; |
cfbf84fc | 955 | } |
f271b2cc | 956 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 957 | } |
f271b2cc MK |
958 | |
959 | /* For ALLMULTI just set the mask to all ones. | |
960 | * This overrides the mask populated above. */ | |
961 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
962 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
963 | ||
964 | /* Now enable the filter */ | |
965 | wmb(); | |
966 | filter->count = nexact; | |
967 | ||
968 | /* Return the number of exact filters */ | |
969 | err = nexact; | |
3b8d2a69 | 970 | free_addr: |
f271b2cc MK |
971 | kfree(addr); |
972 | return err; | |
973 | } | |
974 | ||
975 | /* Returns: 0 - drop, !=0 - accept */ | |
976 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
977 | { | |
978 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
979 | * at this point. */ | |
980 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
981 | int i; | |
982 | ||
983 | /* Exact match */ | |
984 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 985 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
986 | return 1; |
987 | ||
988 | /* Inexact match (multicast only) */ | |
989 | if (is_multicast_ether_addr(eh->h_dest)) | |
990 | return addr_hash_test(filter->mask, eh->h_dest); | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | /* | |
996 | * Checks whether the packet is accepted or not. | |
997 | * Returns: 0 - drop, !=0 - accept | |
998 | */ | |
999 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
1000 | { | |
1001 | if (!filter->count) | |
1002 | return 1; | |
1003 | ||
1004 | return run_filter(filter, skb); | |
1005 | } | |
1006 | ||
1da177e4 LT |
1007 | /* Network device part of the driver */ |
1008 | ||
7282d491 | 1009 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 1010 | |
c70f1829 EB |
1011 | /* Net device detach from fd. */ |
1012 | static void tun_net_uninit(struct net_device *dev) | |
1013 | { | |
c8d68e6b | 1014 | tun_detach_all(dev); |
c70f1829 EB |
1015 | } |
1016 | ||
1da177e4 LT |
1017 | /* Net device open. */ |
1018 | static int tun_net_open(struct net_device *dev) | |
1019 | { | |
b20e2d54 HFS |
1020 | struct tun_struct *tun = netdev_priv(dev); |
1021 | int i; | |
1022 | ||
c8d68e6b | 1023 | netif_tx_start_all_queues(dev); |
b20e2d54 HFS |
1024 | |
1025 | for (i = 0; i < tun->numqueues; i++) { | |
1026 | struct tun_file *tfile; | |
1027 | ||
1028 | tfile = rtnl_dereference(tun->tfiles[i]); | |
1029 | tfile->socket.sk->sk_write_space(tfile->socket.sk); | |
1030 | } | |
1031 | ||
1da177e4 LT |
1032 | return 0; |
1033 | } | |
1034 | ||
1035 | /* Net device close. */ | |
1036 | static int tun_net_close(struct net_device *dev) | |
1037 | { | |
c8d68e6b | 1038 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
1039 | return 0; |
1040 | } | |
1041 | ||
1042 | /* Net device start xmit */ | |
96f84061 | 1043 | static void tun_automq_xmit(struct tun_struct *tun, struct sk_buff *skb) |
1da177e4 | 1044 | { |
3df97ba8 | 1045 | #ifdef CONFIG_RPS |
96f84061 | 1046 | if (tun->numqueues == 1 && static_key_false(&rps_needed)) { |
9bc88939 TH |
1047 | /* Select queue was not called for the skbuff, so we extract the |
1048 | * RPS hash and save it into the flow_table here. | |
1049 | */ | |
1050 | __u32 rxhash; | |
1051 | ||
feec084a | 1052 | rxhash = __skb_get_hash_symmetric(skb); |
9bc88939 TH |
1053 | if (rxhash) { |
1054 | struct tun_flow_entry *e; | |
1055 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
1056 | rxhash); | |
1057 | if (e) | |
1058 | tun_flow_save_rps_rxhash(e, rxhash); | |
1059 | } | |
1060 | } | |
3df97ba8 | 1061 | #endif |
96f84061 JW |
1062 | } |
1063 | ||
aff3d70a JW |
1064 | static unsigned int run_ebpf_filter(struct tun_struct *tun, |
1065 | struct sk_buff *skb, | |
1066 | int len) | |
1067 | { | |
1068 | struct tun_prog *prog = rcu_dereference(tun->filter_prog); | |
1069 | ||
1070 | if (prog) | |
1071 | len = bpf_prog_run_clear_cb(prog->prog, skb); | |
1072 | ||
1073 | return len; | |
1074 | } | |
1075 | ||
96f84061 JW |
1076 | /* Net device start xmit */ |
1077 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
1078 | { | |
1079 | struct tun_struct *tun = netdev_priv(dev); | |
1080 | int txq = skb->queue_mapping; | |
1081 | struct tun_file *tfile; | |
aff3d70a | 1082 | int len = skb->len; |
96f84061 JW |
1083 | |
1084 | rcu_read_lock(); | |
1085 | tfile = rcu_dereference(tun->tfiles[txq]); | |
96f84061 JW |
1086 | |
1087 | /* Drop packet if interface is not attached */ | |
cc166427 | 1088 | if (txq >= tun->numqueues) |
96f84061 JW |
1089 | goto drop; |
1090 | ||
1091 | if (!rcu_dereference(tun->steering_prog)) | |
1092 | tun_automq_xmit(tun, skb); | |
9bc88939 | 1093 | |
6e914fc7 JW |
1094 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
1095 | ||
c8d68e6b JW |
1096 | BUG_ON(!tfile); |
1097 | ||
f271b2cc MK |
1098 | /* Drop if the filter does not like it. |
1099 | * This is a noop if the filter is disabled. | |
1100 | * Filter can be enabled only for the TAP devices. */ | |
1101 | if (!check_filter(&tun->txflt, skb)) | |
1102 | goto drop; | |
1103 | ||
54f968d6 JW |
1104 | if (tfile->socket.sk->sk_filter && |
1105 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
1106 | goto drop; |
1107 | ||
aff3d70a | 1108 | len = run_ebpf_filter(tun, skb, len); |
81c89507 | 1109 | if (len == 0 || pskb_trim(skb, len)) |
aff3d70a JW |
1110 | goto drop; |
1111 | ||
1f8b977a | 1112 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
7bf66305 JW |
1113 | goto drop; |
1114 | ||
7b996243 | 1115 | skb_tx_timestamp(skb); |
eda29772 | 1116 | |
0110d6f2 | 1117 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
1118 | * for indefinite time. |
1119 | */ | |
0110d6f2 MT |
1120 | skb_orphan(skb); |
1121 | ||
f8af75f3 ED |
1122 | nf_reset(skb); |
1123 | ||
5990a305 | 1124 | if (ptr_ring_produce(&tfile->tx_ring, skb)) |
1576d986 | 1125 | goto drop; |
1da177e4 LT |
1126 | |
1127 | /* Notify and wake up reader process */ | |
54f968d6 JW |
1128 | if (tfile->flags & TUN_FASYNC) |
1129 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 1130 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
1131 | |
1132 | rcu_read_unlock(); | |
6ed10654 | 1133 | return NETDEV_TX_OK; |
1da177e4 LT |
1134 | |
1135 | drop: | |
608b9977 | 1136 | this_cpu_inc(tun->pcpu_stats->tx_dropped); |
149d36f7 | 1137 | skb_tx_error(skb); |
1da177e4 | 1138 | kfree_skb(skb); |
6e914fc7 | 1139 | rcu_read_unlock(); |
baeababb | 1140 | return NET_XMIT_DROP; |
1da177e4 LT |
1141 | } |
1142 | ||
f271b2cc | 1143 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 1144 | { |
f271b2cc MK |
1145 | /* |
1146 | * This callback is supposed to deal with mc filter in | |
1147 | * _rx_ path and has nothing to do with the _tx_ path. | |
1148 | * In rx path we always accept everything userspace gives us. | |
1149 | */ | |
1da177e4 LT |
1150 | } |
1151 | ||
c8f44aff MM |
1152 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
1153 | netdev_features_t features) | |
88255375 MM |
1154 | { |
1155 | struct tun_struct *tun = netdev_priv(dev); | |
1156 | ||
1157 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
1158 | } | |
eaea34b2 PA |
1159 | |
1160 | static void tun_set_headroom(struct net_device *dev, int new_hr) | |
1161 | { | |
1162 | struct tun_struct *tun = netdev_priv(dev); | |
1163 | ||
1164 | if (new_hr < NET_SKB_PAD) | |
1165 | new_hr = NET_SKB_PAD; | |
1166 | ||
1167 | tun->align = new_hr; | |
1168 | } | |
1169 | ||
bc1f4470 | 1170 | static void |
608b9977 PA |
1171 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
1172 | { | |
1173 | u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; | |
1174 | struct tun_struct *tun = netdev_priv(dev); | |
1175 | struct tun_pcpu_stats *p; | |
1176 | int i; | |
1177 | ||
1178 | for_each_possible_cpu(i) { | |
1179 | u64 rxpackets, rxbytes, txpackets, txbytes; | |
1180 | unsigned int start; | |
1181 | ||
1182 | p = per_cpu_ptr(tun->pcpu_stats, i); | |
1183 | do { | |
1184 | start = u64_stats_fetch_begin(&p->syncp); | |
1185 | rxpackets = p->rx_packets; | |
1186 | rxbytes = p->rx_bytes; | |
1187 | txpackets = p->tx_packets; | |
1188 | txbytes = p->tx_bytes; | |
1189 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
1190 | ||
1191 | stats->rx_packets += rxpackets; | |
1192 | stats->rx_bytes += rxbytes; | |
1193 | stats->tx_packets += txpackets; | |
1194 | stats->tx_bytes += txbytes; | |
1195 | ||
1196 | /* u32 counters */ | |
1197 | rx_dropped += p->rx_dropped; | |
1198 | rx_frame_errors += p->rx_frame_errors; | |
1199 | tx_dropped += p->tx_dropped; | |
1200 | } | |
1201 | stats->rx_dropped = rx_dropped; | |
1202 | stats->rx_frame_errors = rx_frame_errors; | |
1203 | stats->tx_dropped = tx_dropped; | |
608b9977 PA |
1204 | } |
1205 | ||
761876c8 JW |
1206 | static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1207 | struct netlink_ext_ack *extack) | |
1208 | { | |
1209 | struct tun_struct *tun = netdev_priv(dev); | |
e4a2a304 | 1210 | struct tun_file *tfile; |
761876c8 | 1211 | struct bpf_prog *old_prog; |
e4a2a304 | 1212 | int i; |
761876c8 JW |
1213 | |
1214 | old_prog = rtnl_dereference(tun->xdp_prog); | |
1215 | rcu_assign_pointer(tun->xdp_prog, prog); | |
1216 | if (old_prog) | |
1217 | bpf_prog_put(old_prog); | |
1218 | ||
e4a2a304 JW |
1219 | for (i = 0; i < tun->numqueues; i++) { |
1220 | tfile = rtnl_dereference(tun->tfiles[i]); | |
1221 | if (prog) | |
1222 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1223 | else | |
1224 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1225 | } | |
1226 | list_for_each_entry(tfile, &tun->disabled, next) { | |
1227 | if (prog) | |
1228 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1229 | else | |
1230 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1231 | } | |
1232 | ||
761876c8 JW |
1233 | return 0; |
1234 | } | |
1235 | ||
1236 | static u32 tun_xdp_query(struct net_device *dev) | |
1237 | { | |
1238 | struct tun_struct *tun = netdev_priv(dev); | |
1239 | const struct bpf_prog *xdp_prog; | |
1240 | ||
1241 | xdp_prog = rtnl_dereference(tun->xdp_prog); | |
1242 | if (xdp_prog) | |
1243 | return xdp_prog->aux->id; | |
1244 | ||
1245 | return 0; | |
1246 | } | |
1247 | ||
f4e63525 | 1248 | static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
761876c8 JW |
1249 | { |
1250 | switch (xdp->command) { | |
1251 | case XDP_SETUP_PROG: | |
1252 | return tun_xdp_set(dev, xdp->prog, xdp->extack); | |
1253 | case XDP_QUERY_PROG: | |
1254 | xdp->prog_id = tun_xdp_query(dev); | |
761876c8 JW |
1255 | return 0; |
1256 | default: | |
1257 | return -EINVAL; | |
1258 | } | |
1259 | } | |
1260 | ||
758e43b7 | 1261 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 1262 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1263 | .ndo_open = tun_net_open, |
1264 | .ndo_stop = tun_net_close, | |
00829823 | 1265 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1266 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 1267 | .ndo_select_queue = tun_select_queue, |
eaea34b2 | 1268 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1269 | .ndo_get_stats64 = tun_net_get_stats64, |
758e43b7 SH |
1270 | }; |
1271 | ||
0c9d917b JDB |
1272 | static void __tun_xdp_flush_tfile(struct tun_file *tfile) |
1273 | { | |
1274 | /* Notify and wake up reader process */ | |
1275 | if (tfile->flags & TUN_FASYNC) | |
1276 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
1277 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); | |
1278 | } | |
1279 | ||
42b33468 JDB |
1280 | static int tun_xdp_xmit(struct net_device *dev, int n, |
1281 | struct xdp_frame **frames, u32 flags) | |
fc72d1d5 JW |
1282 | { |
1283 | struct tun_struct *tun = netdev_priv(dev); | |
fc72d1d5 JW |
1284 | struct tun_file *tfile; |
1285 | u32 numqueues; | |
735fc405 JDB |
1286 | int drops = 0; |
1287 | int cnt = n; | |
1288 | int i; | |
fc72d1d5 | 1289 | |
0c9d917b | 1290 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
42b33468 JDB |
1291 | return -EINVAL; |
1292 | ||
fc72d1d5 JW |
1293 | rcu_read_lock(); |
1294 | ||
1295 | numqueues = READ_ONCE(tun->numqueues); | |
1296 | if (!numqueues) { | |
735fc405 JDB |
1297 | rcu_read_unlock(); |
1298 | return -ENXIO; /* Caller will free/return all frames */ | |
fc72d1d5 JW |
1299 | } |
1300 | ||
1301 | tfile = rcu_dereference(tun->tfiles[smp_processor_id() % | |
1302 | numqueues]); | |
735fc405 JDB |
1303 | |
1304 | spin_lock(&tfile->tx_ring.producer_lock); | |
1305 | for (i = 0; i < n; i++) { | |
1306 | struct xdp_frame *xdp = frames[i]; | |
1307 | /* Encode the XDP flag into lowest bit for consumer to differ | |
1308 | * XDP buffer from sk_buff. | |
1309 | */ | |
1310 | void *frame = tun_xdp_to_ptr(xdp); | |
1311 | ||
1312 | if (__ptr_ring_produce(&tfile->tx_ring, frame)) { | |
1313 | this_cpu_inc(tun->pcpu_stats->tx_dropped); | |
1314 | xdp_return_frame_rx_napi(xdp); | |
1315 | drops++; | |
1316 | } | |
fc72d1d5 | 1317 | } |
735fc405 | 1318 | spin_unlock(&tfile->tx_ring.producer_lock); |
fc72d1d5 | 1319 | |
0c9d917b JDB |
1320 | if (flags & XDP_XMIT_FLUSH) |
1321 | __tun_xdp_flush_tfile(tfile); | |
1322 | ||
fc72d1d5 | 1323 | rcu_read_unlock(); |
735fc405 | 1324 | return cnt - drops; |
fc72d1d5 JW |
1325 | } |
1326 | ||
44fa2dbd JDB |
1327 | static int tun_xdp_tx(struct net_device *dev, struct xdp_buff *xdp) |
1328 | { | |
1329 | struct xdp_frame *frame = convert_to_xdp_frame(xdp); | |
1330 | ||
1331 | if (unlikely(!frame)) | |
1332 | return -EOVERFLOW; | |
1333 | ||
42421a56 | 1334 | return tun_xdp_xmit(dev, 1, &frame, XDP_XMIT_FLUSH); |
fc72d1d5 JW |
1335 | } |
1336 | ||
758e43b7 | 1337 | static const struct net_device_ops tap_netdev_ops = { |
c70f1829 | 1338 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1339 | .ndo_open = tun_net_open, |
1340 | .ndo_stop = tun_net_close, | |
00829823 | 1341 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1342 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 1343 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
1344 | .ndo_set_mac_address = eth_mac_addr, |
1345 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 1346 | .ndo_select_queue = tun_select_queue, |
5e52796a | 1347 | .ndo_features_check = passthru_features_check, |
eaea34b2 | 1348 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1349 | .ndo_get_stats64 = tun_net_get_stats64, |
f4e63525 | 1350 | .ndo_bpf = tun_xdp, |
fc72d1d5 | 1351 | .ndo_xdp_xmit = tun_xdp_xmit, |
758e43b7 SH |
1352 | }; |
1353 | ||
944a1376 | 1354 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
1355 | { |
1356 | int i; | |
1357 | ||
96442e42 JW |
1358 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
1359 | INIT_HLIST_HEAD(&tun->flows[i]); | |
1360 | ||
1361 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
e99e88a9 KC |
1362 | timer_setup(&tun->flow_gc_timer, tun_flow_cleanup, 0); |
1363 | mod_timer(&tun->flow_gc_timer, | |
1364 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
1365 | } |
1366 | ||
1367 | static void tun_flow_uninit(struct tun_struct *tun) | |
1368 | { | |
1369 | del_timer_sync(&tun->flow_gc_timer); | |
1370 | tun_flow_flush(tun); | |
96442e42 JW |
1371 | } |
1372 | ||
91572088 JW |
1373 | #define MIN_MTU 68 |
1374 | #define MAX_MTU 65535 | |
1375 | ||
1da177e4 LT |
1376 | /* Initialize net device. */ |
1377 | static void tun_net_init(struct net_device *dev) | |
1378 | { | |
1379 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 1380 | |
1da177e4 | 1381 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 1382 | case IFF_TUN: |
758e43b7 SH |
1383 | dev->netdev_ops = &tun_netdev_ops; |
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 | |
1da177e4 LT |
1404 | break; |
1405 | } | |
91572088 JW |
1406 | |
1407 | dev->min_mtu = MIN_MTU; | |
1408 | dev->max_mtu = MAX_MTU - dev->hard_header_len; | |
1da177e4 LT |
1409 | } |
1410 | ||
2f3ab622 JW |
1411 | static bool tun_sock_writeable(struct tun_struct *tun, struct tun_file *tfile) |
1412 | { | |
1413 | struct sock *sk = tfile->socket.sk; | |
1414 | ||
1415 | return (tun->dev->flags & IFF_UP) && sock_writeable(sk); | |
1416 | } | |
1417 | ||
1da177e4 LT |
1418 | /* Character device part */ |
1419 | ||
1420 | /* Poll */ | |
afc9a42b | 1421 | static __poll_t tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 1422 | { |
b2430de3 | 1423 | struct tun_file *tfile = file->private_data; |
9484dc74 | 1424 | struct tun_struct *tun = tun_get(tfile); |
3c8a9c63 | 1425 | struct sock *sk; |
afc9a42b | 1426 | __poll_t mask = 0; |
1da177e4 LT |
1427 | |
1428 | if (!tun) | |
a9a08845 | 1429 | return EPOLLERR; |
1da177e4 | 1430 | |
54f968d6 | 1431 | sk = tfile->socket.sk; |
3c8a9c63 | 1432 | |
6b8a66ee | 1433 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 1434 | |
9e641bdc | 1435 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 1436 | |
5990a305 | 1437 | if (!ptr_ring_empty(&tfile->tx_ring)) |
a9a08845 | 1438 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 | 1439 | |
2f3ab622 JW |
1440 | /* Make sure SOCKWQ_ASYNC_NOSPACE is set if not writable to |
1441 | * guarantee EPOLLOUT to be raised by either here or | |
1442 | * tun_sock_write_space(). Then process could get notification | |
1443 | * after it writes to a down device and meets -EIO. | |
1444 | */ | |
1445 | if (tun_sock_writeable(tun, tfile) || | |
1446 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
1447 | tun_sock_writeable(tun, tfile))) | |
a9a08845 | 1448 | mask |= EPOLLOUT | EPOLLWRNORM; |
33dccbb0 | 1449 | |
c70f1829 | 1450 | if (tun->dev->reg_state != NETREG_REGISTERED) |
a9a08845 | 1451 | mask = EPOLLERR; |
c70f1829 | 1452 | |
631ab46b | 1453 | tun_put(tun); |
1da177e4 LT |
1454 | return mask; |
1455 | } | |
1456 | ||
90e33d45 PP |
1457 | static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile, |
1458 | size_t len, | |
1459 | const struct iov_iter *it) | |
1460 | { | |
1461 | struct sk_buff *skb; | |
1462 | size_t linear; | |
1463 | int err; | |
1464 | int i; | |
1465 | ||
1466 | if (it->nr_segs > MAX_SKB_FRAGS + 1) | |
1467 | return ERR_PTR(-ENOMEM); | |
1468 | ||
1469 | local_bh_disable(); | |
1470 | skb = napi_get_frags(&tfile->napi); | |
1471 | local_bh_enable(); | |
1472 | if (!skb) | |
1473 | return ERR_PTR(-ENOMEM); | |
1474 | ||
1475 | linear = iov_iter_single_seg_count(it); | |
1476 | err = __skb_grow(skb, linear); | |
1477 | if (err) | |
1478 | goto free; | |
1479 | ||
1480 | skb->len = len; | |
1481 | skb->data_len = len - linear; | |
1482 | skb->truesize += skb->data_len; | |
1483 | ||
1484 | for (i = 1; i < it->nr_segs; i++) { | |
43a08e0f | 1485 | struct page_frag *pfrag = ¤t->task_frag; |
90e33d45 | 1486 | size_t fragsz = it->iov[i].iov_len; |
90e33d45 PP |
1487 | |
1488 | if (fragsz == 0 || fragsz > PAGE_SIZE) { | |
1489 | err = -EINVAL; | |
1490 | goto free; | |
1491 | } | |
1492 | ||
43a08e0f | 1493 | if (!skb_page_frag_refill(fragsz, pfrag, GFP_KERNEL)) { |
90e33d45 PP |
1494 | err = -ENOMEM; |
1495 | goto free; | |
1496 | } | |
1497 | ||
43a08e0f ED |
1498 | skb_fill_page_desc(skb, i - 1, pfrag->page, |
1499 | pfrag->offset, fragsz); | |
1500 | page_ref_inc(pfrag->page); | |
1501 | pfrag->offset += fragsz; | |
90e33d45 PP |
1502 | } |
1503 | ||
1504 | return skb; | |
1505 | free: | |
1506 | /* frees skb and all frags allocated with napi_alloc_frag() */ | |
1507 | napi_free_frags(&tfile->napi); | |
1508 | return ERR_PTR(err); | |
1509 | } | |
1510 | ||
f42157cb RR |
1511 | /* prepad is the amount to reserve at front. len is length after that. |
1512 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1513 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1514 | size_t prepad, size_t len, |
1515 | size_t linear, int noblock) | |
f42157cb | 1516 | { |
54f968d6 | 1517 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1518 | struct sk_buff *skb; |
33dccbb0 | 1519 | int err; |
f42157cb RR |
1520 | |
1521 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1522 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1523 | linear = len; |
f42157cb | 1524 | |
33dccbb0 | 1525 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1526 | &err, 0); |
f42157cb | 1527 | if (!skb) |
33dccbb0 | 1528 | return ERR_PTR(err); |
f42157cb RR |
1529 | |
1530 | skb_reserve(skb, prepad); | |
1531 | skb_put(skb, linear); | |
33dccbb0 HX |
1532 | skb->data_len = len - linear; |
1533 | skb->len += len - linear; | |
f42157cb RR |
1534 | |
1535 | return skb; | |
1536 | } | |
1537 | ||
5503fcec JW |
1538 | static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile, |
1539 | struct sk_buff *skb, int more) | |
1540 | { | |
1541 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
1542 | struct sk_buff_head process_queue; | |
1543 | u32 rx_batched = tun->rx_batched; | |
1544 | bool rcv = false; | |
1545 | ||
1546 | if (!rx_batched || (!more && skb_queue_empty(queue))) { | |
1547 | local_bh_disable(); | |
1548 | netif_receive_skb(skb); | |
1549 | local_bh_enable(); | |
1550 | return; | |
1551 | } | |
1552 | ||
1553 | spin_lock(&queue->lock); | |
1554 | if (!more || skb_queue_len(queue) == rx_batched) { | |
1555 | __skb_queue_head_init(&process_queue); | |
1556 | skb_queue_splice_tail_init(queue, &process_queue); | |
1557 | rcv = true; | |
1558 | } else { | |
1559 | __skb_queue_tail(queue, skb); | |
1560 | } | |
1561 | spin_unlock(&queue->lock); | |
1562 | ||
1563 | if (rcv) { | |
1564 | struct sk_buff *nskb; | |
1565 | ||
1566 | local_bh_disable(); | |
1567 | while ((nskb = __skb_dequeue(&process_queue))) | |
1568 | netif_receive_skb(nskb); | |
1569 | netif_receive_skb(skb); | |
1570 | local_bh_enable(); | |
1571 | } | |
1572 | } | |
1573 | ||
66ccbc9c JW |
1574 | static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, |
1575 | int len, int noblock, bool zerocopy) | |
1576 | { | |
1577 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) | |
1578 | return false; | |
1579 | ||
1580 | if (tfile->socket.sk->sk_sndbuf != INT_MAX) | |
1581 | return false; | |
1582 | ||
1583 | if (!noblock) | |
1584 | return false; | |
1585 | ||
1586 | if (zerocopy) | |
1587 | return false; | |
1588 | ||
1589 | if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + | |
1590 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
1591 | return false; | |
1592 | ||
1593 | return true; | |
1594 | } | |
1595 | ||
ac1f1f6c | 1596 | static struct sk_buff *__tun_build_skb(struct page_frag *alloc_frag, char *buf, |
8ae1aff0 | 1597 | int buflen, int len, int pad) |
ac1f1f6c JW |
1598 | { |
1599 | struct sk_buff *skb = build_skb(buf, buflen); | |
1600 | ||
1601 | if (!skb) | |
1602 | return ERR_PTR(-ENOMEM); | |
1603 | ||
8ae1aff0 | 1604 | skb_reserve(skb, pad); |
ac1f1f6c JW |
1605 | skb_put(skb, len); |
1606 | ||
1607 | get_page(alloc_frag->page); | |
1608 | alloc_frag->offset += buflen; | |
1609 | ||
1610 | return skb; | |
1611 | } | |
1612 | ||
8ae1aff0 JW |
1613 | static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog, |
1614 | struct xdp_buff *xdp, u32 act) | |
1615 | { | |
1616 | int err; | |
1617 | ||
1618 | switch (act) { | |
1619 | case XDP_REDIRECT: | |
1620 | err = xdp_do_redirect(tun->dev, xdp, xdp_prog); | |
8ae1aff0 JW |
1621 | if (err) |
1622 | return err; | |
1623 | break; | |
1624 | case XDP_TX: | |
1625 | err = tun_xdp_tx(tun->dev, xdp); | |
1626 | if (err < 0) | |
1627 | return err; | |
1628 | break; | |
1629 | case XDP_PASS: | |
1630 | break; | |
1631 | default: | |
1632 | bpf_warn_invalid_xdp_action(act); | |
1633 | /* fall through */ | |
1634 | case XDP_ABORTED: | |
1635 | trace_xdp_exception(tun->dev, xdp_prog, act); | |
1636 | /* fall through */ | |
1637 | case XDP_DROP: | |
1638 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1639 | break; | |
1640 | } | |
1641 | ||
1642 | return act; | |
1643 | } | |
1644 | ||
761876c8 JW |
1645 | static struct sk_buff *tun_build_skb(struct tun_struct *tun, |
1646 | struct tun_file *tfile, | |
66ccbc9c | 1647 | struct iov_iter *from, |
761876c8 | 1648 | struct virtio_net_hdr *hdr, |
1cfe6e93 | 1649 | int len, int *skb_xdp) |
66ccbc9c | 1650 | { |
0bbd7dad | 1651 | struct page_frag *alloc_frag = ¤t->task_frag; |
761876c8 | 1652 | struct bpf_prog *xdp_prog; |
7df13219 | 1653 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
66ccbc9c JW |
1654 | char *buf; |
1655 | size_t copied; | |
8ae1aff0 JW |
1656 | int pad = TUN_RX_PAD; |
1657 | int err = 0; | |
7df13219 JW |
1658 | |
1659 | rcu_read_lock(); | |
1660 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1661 | if (xdp_prog) | |
4f23aff8 | 1662 | pad += XDP_PACKET_HEADROOM; |
7df13219 JW |
1663 | buflen += SKB_DATA_ALIGN(len + pad); |
1664 | rcu_read_unlock(); | |
66ccbc9c | 1665 | |
63b9ab65 | 1666 | alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); |
66ccbc9c JW |
1667 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) |
1668 | return ERR_PTR(-ENOMEM); | |
1669 | ||
1670 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
1671 | copied = copy_page_from_iter(alloc_frag->page, | |
7df13219 | 1672 | alloc_frag->offset + pad, |
66ccbc9c JW |
1673 | len, from); |
1674 | if (copied != len) | |
1675 | return ERR_PTR(-EFAULT); | |
1676 | ||
7df13219 JW |
1677 | /* There's a small window that XDP may be set after the check |
1678 | * of xdp_prog above, this should be rare and for simplicity | |
1679 | * we do XDP on skb in case the headroom is not enough. | |
1680 | */ | |
ac1f1f6c | 1681 | if (hdr->gso_type || !xdp_prog) { |
1cfe6e93 | 1682 | *skb_xdp = 1; |
8ae1aff0 | 1683 | return __tun_build_skb(alloc_frag, buf, buflen, len, pad); |
ac1f1f6c JW |
1684 | } |
1685 | ||
1686 | *skb_xdp = 0; | |
761876c8 | 1687 | |
6547e387 | 1688 | local_bh_disable(); |
761876c8 JW |
1689 | rcu_read_lock(); |
1690 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
8ae1aff0 | 1691 | if (xdp_prog) { |
761876c8 | 1692 | struct xdp_buff xdp; |
761876c8 JW |
1693 | u32 act; |
1694 | ||
1695 | xdp.data_hard_start = buf; | |
7df13219 | 1696 | xdp.data = buf + pad; |
de8f3a83 | 1697 | xdp_set_data_meta_invalid(&xdp); |
761876c8 | 1698 | xdp.data_end = xdp.data + len; |
8bf5c4ee | 1699 | xdp.rxq = &tfile->xdp_rxq; |
761876c8 | 1700 | |
8ae1aff0 JW |
1701 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
1702 | if (act == XDP_REDIRECT || act == XDP_TX) { | |
59655a5b JW |
1703 | get_page(alloc_frag->page); |
1704 | alloc_frag->offset += buflen; | |
761876c8 | 1705 | } |
8ae1aff0 JW |
1706 | err = tun_xdp_act(tun, xdp_prog, &xdp, act); |
1707 | if (err < 0) | |
1708 | goto err_xdp; | |
1a097910 JW |
1709 | if (err == XDP_REDIRECT) |
1710 | xdp_do_flush_map(); | |
8ae1aff0 JW |
1711 | if (err != XDP_PASS) |
1712 | goto out; | |
1713 | ||
1714 | pad = xdp.data - xdp.data_hard_start; | |
1715 | len = xdp.data_end - xdp.data; | |
761876c8 | 1716 | } |
291aeb2b JW |
1717 | rcu_read_unlock(); |
1718 | local_bh_enable(); | |
761876c8 | 1719 | |
8ae1aff0 | 1720 | return __tun_build_skb(alloc_frag, buf, buflen, len, pad); |
761876c8 | 1721 | |
8ae1aff0 | 1722 | err_xdp: |
761876c8 | 1723 | put_page(alloc_frag->page); |
f7053b6c | 1724 | out: |
761876c8 | 1725 | rcu_read_unlock(); |
6547e387 | 1726 | local_bh_enable(); |
761876c8 | 1727 | return NULL; |
66ccbc9c JW |
1728 | } |
1729 | ||
1da177e4 | 1730 | /* Get packet from user space buffer */ |
54f968d6 | 1731 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 | 1732 | void *msg_control, struct iov_iter *from, |
5503fcec | 1733 | int noblock, bool more) |
1da177e4 | 1734 | { |
09640e63 | 1735 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1736 | struct sk_buff *skb; |
f5ff53b4 | 1737 | size_t total_len = iov_iter_count(from); |
eaea34b2 | 1738 | size_t len = total_len, align = tun->align, linear; |
f43798c2 | 1739 | struct virtio_net_hdr gso = { 0 }; |
608b9977 | 1740 | struct tun_pcpu_stats *stats; |
96f8d9ec | 1741 | int good_linear; |
0690899b MT |
1742 | int copylen; |
1743 | bool zerocopy = false; | |
1744 | int err; | |
96f84061 | 1745 | u32 rxhash = 0; |
1cfe6e93 | 1746 | int skb_xdp = 1; |
af3fb24e | 1747 | bool frags = tun_napi_frags_enabled(tfile); |
1da177e4 | 1748 | |
1bd4978a ED |
1749 | if (!(tun->dev->flags & IFF_UP)) |
1750 | return -EIO; | |
1751 | ||
40630b82 | 1752 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1753 | if (len < sizeof(pi)) |
1da177e4 | 1754 | return -EINVAL; |
15718ea0 | 1755 | len -= sizeof(pi); |
1da177e4 | 1756 | |
cbbd26b8 | 1757 | if (!copy_from_iter_full(&pi, sizeof(pi), from)) |
1da177e4 LT |
1758 | return -EFAULT; |
1759 | } | |
1760 | ||
40630b82 | 1761 | if (tun->flags & IFF_VNET_HDR) { |
e1edab87 WB |
1762 | int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1763 | ||
1764 | if (len < vnet_hdr_sz) | |
f43798c2 | 1765 | return -EINVAL; |
e1edab87 | 1766 | len -= vnet_hdr_sz; |
f43798c2 | 1767 | |
cbbd26b8 | 1768 | if (!copy_from_iter_full(&gso, sizeof(gso), from)) |
f43798c2 RR |
1769 | return -EFAULT; |
1770 | ||
4909122f | 1771 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1772 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1773 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1774 | |
56f0dcc5 | 1775 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1776 | return -EINVAL; |
e1edab87 | 1777 | iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1778 | } |
1779 | ||
40630b82 | 1780 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1781 | align += NET_IP_ALIGN; |
0eca93bc | 1782 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1783 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1784 | return -EINVAL; |
1785 | } | |
6aa20a22 | 1786 | |
96f8d9ec JW |
1787 | good_linear = SKB_MAX_HEAD(align); |
1788 | ||
88529176 | 1789 | if (msg_control) { |
f5ff53b4 AV |
1790 | struct iov_iter i = *from; |
1791 | ||
88529176 JW |
1792 | /* There are 256 bytes to be copied in skb, so there is |
1793 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1794 | * The rest of the buffer is mapped from userspace. |
1795 | */ | |
56f0dcc5 | 1796 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1797 | if (copylen > good_linear) |
1798 | copylen = good_linear; | |
3dd5c330 | 1799 | linear = copylen; |
f5ff53b4 AV |
1800 | iov_iter_advance(&i, copylen); |
1801 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1802 | zerocopy = true; |
1803 | } | |
1804 | ||
90e33d45 | 1805 | if (!frags && tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) { |
1cfe6e93 JW |
1806 | /* For the packet that is not easy to be processed |
1807 | * (e.g gso or jumbo packet), we will do it at after | |
1808 | * skb was created with generic XDP routine. | |
1809 | */ | |
1810 | skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp); | |
66ccbc9c | 1811 | if (IS_ERR(skb)) { |
608b9977 | 1812 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
66ccbc9c JW |
1813 | return PTR_ERR(skb); |
1814 | } | |
761876c8 JW |
1815 | if (!skb) |
1816 | return total_len; | |
66ccbc9c JW |
1817 | } else { |
1818 | if (!zerocopy) { | |
1819 | copylen = len; | |
1820 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) | |
1821 | linear = good_linear; | |
1822 | else | |
1823 | linear = tun16_to_cpu(tun, gso.hdr_len); | |
1824 | } | |
1da177e4 | 1825 | |
90e33d45 PP |
1826 | if (frags) { |
1827 | mutex_lock(&tfile->napi_mutex); | |
1828 | skb = tun_napi_alloc_frags(tfile, copylen, from); | |
1829 | /* tun_napi_alloc_frags() enforces a layout for the skb. | |
1830 | * If zerocopy is enabled, then this layout will be | |
1831 | * overwritten by zerocopy_sg_from_iter(). | |
1832 | */ | |
1833 | zerocopy = false; | |
1834 | } else { | |
1835 | skb = tun_alloc_skb(tfile, align, copylen, linear, | |
1836 | noblock); | |
1837 | } | |
1838 | ||
66ccbc9c JW |
1839 | if (IS_ERR(skb)) { |
1840 | if (PTR_ERR(skb) != -EAGAIN) | |
1841 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
90e33d45 PP |
1842 | if (frags) |
1843 | mutex_unlock(&tfile->napi_mutex); | |
66ccbc9c JW |
1844 | return PTR_ERR(skb); |
1845 | } | |
0690899b | 1846 | |
66ccbc9c JW |
1847 | if (zerocopy) |
1848 | err = zerocopy_sg_from_iter(skb, from); | |
1849 | else | |
1850 | err = skb_copy_datagram_from_iter(skb, 0, from, len); | |
1851 | ||
1852 | if (err) { | |
1853 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1854 | kfree_skb(skb); | |
90e33d45 PP |
1855 | if (frags) { |
1856 | tfile->napi.skb = NULL; | |
1857 | mutex_unlock(&tfile->napi_mutex); | |
1858 | } | |
1859 | ||
66ccbc9c JW |
1860 | return -EFAULT; |
1861 | } | |
8f22757e | 1862 | } |
1da177e4 | 1863 | |
3e9e40e7 | 1864 | if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { |
df10db98 PA |
1865 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); |
1866 | kfree_skb(skb); | |
90e33d45 PP |
1867 | if (frags) { |
1868 | tfile->napi.skb = NULL; | |
1869 | mutex_unlock(&tfile->napi_mutex); | |
1870 | } | |
1871 | ||
df10db98 PA |
1872 | return -EINVAL; |
1873 | } | |
1874 | ||
1da177e4 | 1875 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1876 | case IFF_TUN: |
1877 | if (tun->flags & IFF_NO_PI) { | |
2580c4c1 AP |
1878 | u8 ip_version = skb->len ? (skb->data[0] >> 4) : 0; |
1879 | ||
1880 | switch (ip_version) { | |
1881 | case 4: | |
f09f7ee2 AWC |
1882 | pi.proto = htons(ETH_P_IP); |
1883 | break; | |
2580c4c1 | 1884 | case 6: |
f09f7ee2 AWC |
1885 | pi.proto = htons(ETH_P_IPV6); |
1886 | break; | |
1887 | default: | |
608b9977 | 1888 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
f09f7ee2 AWC |
1889 | kfree_skb(skb); |
1890 | return -EINVAL; | |
1891 | } | |
1892 | } | |
1893 | ||
459a98ed | 1894 | skb_reset_mac_header(skb); |
1da177e4 | 1895 | skb->protocol = pi.proto; |
4c13eb66 | 1896 | skb->dev = tun->dev; |
1da177e4 | 1897 | break; |
40630b82 | 1898 | case IFF_TAP: |
90e33d45 PP |
1899 | if (!frags) |
1900 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1da177e4 | 1901 | break; |
6403eab1 | 1902 | } |
1da177e4 | 1903 | |
0690899b MT |
1904 | /* copy skb_ubuf_info for callback when skb has no error */ |
1905 | if (zerocopy) { | |
1906 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1907 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1908 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
af1cc7a2 JW |
1909 | } else if (msg_control) { |
1910 | struct ubuf_info *uarg = msg_control; | |
1911 | uarg->callback(uarg, false); | |
0690899b MT |
1912 | } |
1913 | ||
72f65107 | 1914 | skb_reset_network_header(skb); |
40893fd0 | 1915 | skb_probe_transport_header(skb, 0); |
38502af7 | 1916 | |
1cfe6e93 | 1917 | if (skb_xdp) { |
761876c8 JW |
1918 | struct bpf_prog *xdp_prog; |
1919 | int ret; | |
1920 | ||
6547e387 | 1921 | local_bh_disable(); |
761876c8 JW |
1922 | rcu_read_lock(); |
1923 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1924 | if (xdp_prog) { | |
1925 | ret = do_xdp_generic(xdp_prog, skb); | |
1926 | if (ret != XDP_PASS) { | |
1927 | rcu_read_unlock(); | |
6547e387 | 1928 | local_bh_enable(); |
761876c8 JW |
1929 | return total_len; |
1930 | } | |
1931 | } | |
1932 | rcu_read_unlock(); | |
6547e387 | 1933 | local_bh_enable(); |
761876c8 JW |
1934 | } |
1935 | ||
cf1a1e07 PA |
1936 | /* Compute the costly rx hash only if needed for flow updates. |
1937 | * We may get a very small possibility of OOO during switching, not | |
1938 | * worth to optimize. | |
1939 | */ | |
1940 | if (!rcu_access_pointer(tun->steering_prog) && tun->numqueues > 1 && | |
1941 | !tfile->detached) | |
96f84061 | 1942 | rxhash = __skb_get_hash_symmetric(skb); |
94317099 | 1943 | |
90e33d45 PP |
1944 | if (frags) { |
1945 | /* Exercise flow dissector code path. */ | |
1946 | u32 headlen = eth_get_headlen(skb->data, skb_headlen(skb)); | |
1947 | ||
010f245b | 1948 | if (unlikely(headlen > skb_headlen(skb))) { |
90e33d45 PP |
1949 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
1950 | napi_free_frags(&tfile->napi); | |
1951 | mutex_unlock(&tfile->napi_mutex); | |
1952 | WARN_ON(1); | |
1953 | return -ENOMEM; | |
1954 | } | |
1955 | ||
1956 | local_bh_disable(); | |
1957 | napi_gro_frags(&tfile->napi); | |
1958 | local_bh_enable(); | |
1959 | mutex_unlock(&tfile->napi_mutex); | |
aec72f33 | 1960 | } else if (tfile->napi_enabled) { |
94317099 PP |
1961 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; |
1962 | int queue_len; | |
1963 | ||
1964 | spin_lock_bh(&queue->lock); | |
1965 | __skb_queue_tail(queue, skb); | |
1966 | queue_len = skb_queue_len(queue); | |
1967 | spin_unlock(&queue->lock); | |
1968 | ||
1969 | if (!more || queue_len > NAPI_POLL_WEIGHT) | |
1970 | napi_schedule(&tfile->napi); | |
1971 | ||
1972 | local_bh_enable(); | |
1973 | } else if (!IS_ENABLED(CONFIG_4KSTACKS)) { | |
1974 | tun_rx_batched(tun, tfile, skb, more); | |
1975 | } else { | |
1976 | netif_rx_ni(skb); | |
1977 | } | |
6aa20a22 | 1978 | |
608b9977 PA |
1979 | stats = get_cpu_ptr(tun->pcpu_stats); |
1980 | u64_stats_update_begin(&stats->syncp); | |
1981 | stats->rx_packets++; | |
1982 | stats->rx_bytes += len; | |
1983 | u64_stats_update_end(&stats->syncp); | |
1984 | put_cpu_ptr(stats); | |
1da177e4 | 1985 | |
96f84061 JW |
1986 | if (rxhash) |
1987 | tun_flow_update(tun, rxhash, tfile); | |
1988 | ||
0690899b | 1989 | return total_len; |
6aa20a22 | 1990 | } |
1da177e4 | 1991 | |
f5ff53b4 | 1992 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 1993 | { |
33dccbb0 | 1994 | struct file *file = iocb->ki_filp; |
54f968d6 | 1995 | struct tun_file *tfile = file->private_data; |
9484dc74 | 1996 | struct tun_struct *tun = tun_get(tfile); |
631ab46b | 1997 | ssize_t result; |
1da177e4 LT |
1998 | |
1999 | if (!tun) | |
2000 | return -EBADFD; | |
2001 | ||
5503fcec JW |
2002 | result = tun_get_user(tun, tfile, NULL, from, |
2003 | file->f_flags & O_NONBLOCK, false); | |
631ab46b EB |
2004 | |
2005 | tun_put(tun); | |
2006 | return result; | |
1da177e4 LT |
2007 | } |
2008 | ||
fc72d1d5 JW |
2009 | static ssize_t tun_put_user_xdp(struct tun_struct *tun, |
2010 | struct tun_file *tfile, | |
1ffcbc85 | 2011 | struct xdp_frame *xdp_frame, |
fc72d1d5 JW |
2012 | struct iov_iter *iter) |
2013 | { | |
2014 | int vnet_hdr_sz = 0; | |
1ffcbc85 | 2015 | size_t size = xdp_frame->len; |
fc72d1d5 JW |
2016 | struct tun_pcpu_stats *stats; |
2017 | size_t ret; | |
2018 | ||
2019 | if (tun->flags & IFF_VNET_HDR) { | |
2020 | struct virtio_net_hdr gso = { 0 }; | |
2021 | ||
2022 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); | |
2023 | if (unlikely(iov_iter_count(iter) < vnet_hdr_sz)) | |
2024 | return -EINVAL; | |
2025 | if (unlikely(copy_to_iter(&gso, sizeof(gso), iter) != | |
2026 | sizeof(gso))) | |
2027 | return -EFAULT; | |
2028 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
2029 | } | |
2030 | ||
1ffcbc85 | 2031 | ret = copy_to_iter(xdp_frame->data, size, iter) + vnet_hdr_sz; |
fc72d1d5 JW |
2032 | |
2033 | stats = get_cpu_ptr(tun->pcpu_stats); | |
2034 | u64_stats_update_begin(&stats->syncp); | |
2035 | stats->tx_packets++; | |
2036 | stats->tx_bytes += ret; | |
2037 | u64_stats_update_end(&stats->syncp); | |
2038 | put_cpu_ptr(tun->pcpu_stats); | |
2039 | ||
2040 | return ret; | |
2041 | } | |
2042 | ||
1da177e4 | 2043 | /* Put packet to the user space buffer */ |
6f7c156c | 2044 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 2045 | struct tun_file *tfile, |
6f7c156c | 2046 | struct sk_buff *skb, |
e0b46d0e | 2047 | struct iov_iter *iter) |
1da177e4 LT |
2048 | { |
2049 | struct tun_pi pi = { 0, skb->protocol }; | |
608b9977 | 2050 | struct tun_pcpu_stats *stats; |
e0b46d0e | 2051 | ssize_t total; |
8c847d25 | 2052 | int vlan_offset = 0; |
a8f9bfdf | 2053 | int vlan_hlen = 0; |
2eb783c4 | 2054 | int vnet_hdr_sz = 0; |
a8f9bfdf | 2055 | |
df8a39de | 2056 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 2057 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 2058 | |
40630b82 | 2059 | if (tun->flags & IFF_VNET_HDR) |
e1edab87 | 2060 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1da177e4 | 2061 | |
e0b46d0e HX |
2062 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
2063 | ||
40630b82 | 2064 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 2065 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
2066 | return -EINVAL; |
2067 | ||
e0b46d0e HX |
2068 | total += sizeof(pi); |
2069 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
2070 | /* Packet will be striped */ |
2071 | pi.flags |= TUN_PKT_STRIP; | |
2072 | } | |
6aa20a22 | 2073 | |
e0b46d0e | 2074 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 2075 | return -EFAULT; |
6aa20a22 | 2076 | } |
1da177e4 | 2077 | |
2eb783c4 | 2078 | if (vnet_hdr_sz) { |
9403cd7c | 2079 | struct virtio_net_hdr gso; |
34166093 | 2080 | |
e0b46d0e | 2081 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
2082 | return -EINVAL; |
2083 | ||
3e9e40e7 | 2084 | if (virtio_net_hdr_from_skb(skb, &gso, |
fd3a8862 WB |
2085 | tun_is_little_endian(tun), true, |
2086 | vlan_hlen)) { | |
f43798c2 | 2087 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
34166093 MR |
2088 | pr_err("unexpected GSO type: " |
2089 | "0x%x, gso_size %d, hdr_len %d\n", | |
2090 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), | |
2091 | tun16_to_cpu(tun, gso.hdr_len)); | |
2092 | print_hex_dump(KERN_ERR, "tun: ", | |
2093 | DUMP_PREFIX_NONE, | |
2094 | 16, 1, skb->head, | |
2095 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); | |
2096 | WARN_ON_ONCE(1); | |
2097 | return -EINVAL; | |
2098 | } | |
f43798c2 | 2099 | |
e0b46d0e | 2100 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 2101 | return -EFAULT; |
8c847d25 JW |
2102 | |
2103 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
2104 | } |
2105 | ||
a8f9bfdf | 2106 | if (vlan_hlen) { |
e0b46d0e | 2107 | int ret; |
aff3d70a | 2108 | struct veth veth; |
6680ec68 JW |
2109 | |
2110 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 2111 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
2112 | |
2113 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 2114 | |
e0b46d0e HX |
2115 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
2116 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
2117 | goto done; |
2118 | ||
e0b46d0e HX |
2119 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
2120 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
2121 | goto done; |
2122 | } | |
1da177e4 | 2123 | |
e0b46d0e | 2124 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 2125 | |
6680ec68 | 2126 | done: |
608b9977 PA |
2127 | /* caller is in process context, */ |
2128 | stats = get_cpu_ptr(tun->pcpu_stats); | |
2129 | u64_stats_update_begin(&stats->syncp); | |
2130 | stats->tx_packets++; | |
2131 | stats->tx_bytes += skb->len + vlan_hlen; | |
2132 | u64_stats_update_end(&stats->syncp); | |
2133 | put_cpu_ptr(tun->pcpu_stats); | |
1da177e4 LT |
2134 | |
2135 | return total; | |
2136 | } | |
2137 | ||
fc72d1d5 | 2138 | static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err) |
1576d986 JW |
2139 | { |
2140 | DECLARE_WAITQUEUE(wait, current); | |
fc72d1d5 | 2141 | void *ptr = NULL; |
f48cc6b2 | 2142 | int error = 0; |
1576d986 | 2143 | |
fc72d1d5 JW |
2144 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2145 | if (ptr) | |
1576d986 JW |
2146 | goto out; |
2147 | if (noblock) { | |
f48cc6b2 | 2148 | error = -EAGAIN; |
1576d986 JW |
2149 | goto out; |
2150 | } | |
2151 | ||
2152 | add_wait_queue(&tfile->wq.wait, &wait); | |
2153 | current->state = TASK_INTERRUPTIBLE; | |
2154 | ||
2155 | while (1) { | |
fc72d1d5 JW |
2156 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2157 | if (ptr) | |
1576d986 JW |
2158 | break; |
2159 | if (signal_pending(current)) { | |
f48cc6b2 | 2160 | error = -ERESTARTSYS; |
1576d986 JW |
2161 | break; |
2162 | } | |
2163 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { | |
f48cc6b2 | 2164 | error = -EFAULT; |
1576d986 JW |
2165 | break; |
2166 | } | |
2167 | ||
2168 | schedule(); | |
2169 | } | |
2170 | ||
2171 | current->state = TASK_RUNNING; | |
2172 | remove_wait_queue(&tfile->wq.wait, &wait); | |
2173 | ||
2174 | out: | |
f48cc6b2 | 2175 | *err = error; |
fc72d1d5 | 2176 | return ptr; |
1576d986 JW |
2177 | } |
2178 | ||
54f968d6 | 2179 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 | 2180 | struct iov_iter *to, |
fc72d1d5 | 2181 | int noblock, void *ptr) |
1da177e4 | 2182 | { |
9b067034 | 2183 | ssize_t ret; |
1576d986 | 2184 | int err; |
1da177e4 | 2185 | |
3872baf6 | 2186 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 2187 | |
c33ee15b | 2188 | if (!iov_iter_count(to)) { |
fc72d1d5 | 2189 | tun_ptr_free(ptr); |
9b067034 | 2190 | return 0; |
c33ee15b | 2191 | } |
1da177e4 | 2192 | |
fc72d1d5 | 2193 | if (!ptr) { |
ac77cfd4 | 2194 | /* Read frames from ring */ |
fc72d1d5 JW |
2195 | ptr = tun_ring_recv(tfile, noblock, &err); |
2196 | if (!ptr) | |
ac77cfd4 JW |
2197 | return err; |
2198 | } | |
e0b46d0e | 2199 | |
1ffcbc85 JDB |
2200 | if (tun_is_xdp_frame(ptr)) { |
2201 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2202 | |
1ffcbc85 | 2203 | ret = tun_put_user_xdp(tun, tfile, xdpf, to); |
03993094 | 2204 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
2205 | } else { |
2206 | struct sk_buff *skb = ptr; | |
2207 | ||
2208 | ret = tun_put_user(tun, tfile, skb, to); | |
2209 | if (unlikely(ret < 0)) | |
2210 | kfree_skb(skb); | |
2211 | else | |
2212 | consume_skb(skb); | |
2213 | } | |
1da177e4 | 2214 | |
05c2828c MT |
2215 | return ret; |
2216 | } | |
2217 | ||
9b067034 | 2218 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
2219 | { |
2220 | struct file *file = iocb->ki_filp; | |
2221 | struct tun_file *tfile = file->private_data; | |
9484dc74 | 2222 | struct tun_struct *tun = tun_get(tfile); |
9b067034 | 2223 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
2224 | |
2225 | if (!tun) | |
2226 | return -EBADFD; | |
ac77cfd4 | 2227 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL); |
42404c09 | 2228 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
2229 | if (ret > 0) |
2230 | iocb->ki_pos = ret; | |
631ab46b | 2231 | tun_put(tun); |
1da177e4 LT |
2232 | return ret; |
2233 | } | |
2234 | ||
cd5681d7 | 2235 | static void tun_prog_free(struct rcu_head *rcu) |
96f84061 | 2236 | { |
cd5681d7 | 2237 | struct tun_prog *prog = container_of(rcu, struct tun_prog, rcu); |
96f84061 JW |
2238 | |
2239 | bpf_prog_destroy(prog->prog); | |
2240 | kfree(prog); | |
2241 | } | |
2242 | ||
9d6474e4 JW |
2243 | static int __tun_set_ebpf(struct tun_struct *tun, |
2244 | struct tun_prog __rcu **prog_p, | |
cd5681d7 | 2245 | struct bpf_prog *prog) |
96f84061 | 2246 | { |
cd5681d7 | 2247 | struct tun_prog *old, *new = NULL; |
96f84061 JW |
2248 | |
2249 | if (prog) { | |
2250 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2251 | if (!new) | |
2252 | return -ENOMEM; | |
2253 | new->prog = prog; | |
2254 | } | |
2255 | ||
124da8f6 | 2256 | spin_lock_bh(&tun->lock); |
cd5681d7 | 2257 | old = rcu_dereference_protected(*prog_p, |
124da8f6 | 2258 | lockdep_is_held(&tun->lock)); |
cd5681d7 | 2259 | rcu_assign_pointer(*prog_p, new); |
124da8f6 | 2260 | spin_unlock_bh(&tun->lock); |
96f84061 JW |
2261 | |
2262 | if (old) | |
cd5681d7 | 2263 | call_rcu(&old->rcu, tun_prog_free); |
96f84061 JW |
2264 | |
2265 | return 0; | |
2266 | } | |
2267 | ||
96442e42 JW |
2268 | static void tun_free_netdev(struct net_device *dev) |
2269 | { | |
2270 | struct tun_struct *tun = netdev_priv(dev); | |
2271 | ||
4008e97f | 2272 | BUG_ON(!(list_empty(&tun->disabled))); |
608b9977 | 2273 | free_percpu(tun->pcpu_stats); |
96442e42 | 2274 | tun_flow_uninit(tun); |
5dbbaf2d | 2275 | security_tun_dev_free_security(tun->security); |
cd5681d7 | 2276 | __tun_set_ebpf(tun, &tun->steering_prog, NULL); |
aff3d70a | 2277 | __tun_set_ebpf(tun, &tun->filter_prog, NULL); |
96442e42 JW |
2278 | } |
2279 | ||
1da177e4 LT |
2280 | static void tun_setup(struct net_device *dev) |
2281 | { | |
2282 | struct tun_struct *tun = netdev_priv(dev); | |
2283 | ||
0625c883 EB |
2284 | tun->owner = INVALID_UID; |
2285 | tun->group = INVALID_GID; | |
4e24f2dd | 2286 | tun_default_link_ksettings(dev, &tun->link_ksettings); |
1da177e4 | 2287 | |
1da177e4 | 2288 | dev->ethtool_ops = &tun_ethtool_ops; |
cf124db5 DM |
2289 | dev->needs_free_netdev = true; |
2290 | dev->priv_destructor = tun_free_netdev; | |
016adb72 JW |
2291 | /* We prefer our own queue length */ |
2292 | dev->tx_queue_len = TUN_READQ_SIZE; | |
1da177e4 LT |
2293 | } |
2294 | ||
f019a7a5 EB |
2295 | /* Trivial set of netlink ops to allow deleting tun or tap |
2296 | * device with netlink. | |
2297 | */ | |
a8b8a889 MS |
2298 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[], |
2299 | struct netlink_ext_ack *extack) | |
f019a7a5 EB |
2300 | { |
2301 | return -EINVAL; | |
2302 | } | |
2303 | ||
1ec010e7 SD |
2304 | static size_t tun_get_size(const struct net_device *dev) |
2305 | { | |
2306 | BUILD_BUG_ON(sizeof(u32) != sizeof(uid_t)); | |
2307 | BUILD_BUG_ON(sizeof(u32) != sizeof(gid_t)); | |
2308 | ||
2309 | return nla_total_size(sizeof(uid_t)) + /* OWNER */ | |
2310 | nla_total_size(sizeof(gid_t)) + /* GROUP */ | |
2311 | nla_total_size(sizeof(u8)) + /* TYPE */ | |
2312 | nla_total_size(sizeof(u8)) + /* PI */ | |
2313 | nla_total_size(sizeof(u8)) + /* VNET_HDR */ | |
2314 | nla_total_size(sizeof(u8)) + /* PERSIST */ | |
2315 | nla_total_size(sizeof(u8)) + /* MULTI_QUEUE */ | |
2316 | nla_total_size(sizeof(u32)) + /* NUM_QUEUES */ | |
2317 | nla_total_size(sizeof(u32)) + /* NUM_DISABLED_QUEUES */ | |
2318 | 0; | |
2319 | } | |
2320 | ||
2321 | static int tun_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
2322 | { | |
2323 | struct tun_struct *tun = netdev_priv(dev); | |
2324 | ||
2325 | if (nla_put_u8(skb, IFLA_TUN_TYPE, tun->flags & TUN_TYPE_MASK)) | |
2326 | goto nla_put_failure; | |
2327 | if (uid_valid(tun->owner) && | |
2328 | nla_put_u32(skb, IFLA_TUN_OWNER, | |
2329 | from_kuid_munged(current_user_ns(), tun->owner))) | |
2330 | goto nla_put_failure; | |
2331 | if (gid_valid(tun->group) && | |
2332 | nla_put_u32(skb, IFLA_TUN_GROUP, | |
2333 | from_kgid_munged(current_user_ns(), tun->group))) | |
2334 | goto nla_put_failure; | |
2335 | if (nla_put_u8(skb, IFLA_TUN_PI, !(tun->flags & IFF_NO_PI))) | |
2336 | goto nla_put_failure; | |
2337 | if (nla_put_u8(skb, IFLA_TUN_VNET_HDR, !!(tun->flags & IFF_VNET_HDR))) | |
2338 | goto nla_put_failure; | |
2339 | if (nla_put_u8(skb, IFLA_TUN_PERSIST, !!(tun->flags & IFF_PERSIST))) | |
2340 | goto nla_put_failure; | |
2341 | if (nla_put_u8(skb, IFLA_TUN_MULTI_QUEUE, | |
2342 | !!(tun->flags & IFF_MULTI_QUEUE))) | |
2343 | goto nla_put_failure; | |
2344 | if (tun->flags & IFF_MULTI_QUEUE) { | |
2345 | if (nla_put_u32(skb, IFLA_TUN_NUM_QUEUES, tun->numqueues)) | |
2346 | goto nla_put_failure; | |
2347 | if (nla_put_u32(skb, IFLA_TUN_NUM_DISABLED_QUEUES, | |
2348 | tun->numdisabled)) | |
2349 | goto nla_put_failure; | |
2350 | } | |
2351 | ||
2352 | return 0; | |
2353 | ||
2354 | nla_put_failure: | |
2355 | return -EMSGSIZE; | |
2356 | } | |
2357 | ||
f019a7a5 EB |
2358 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
2359 | .kind = DRV_NAME, | |
2360 | .priv_size = sizeof(struct tun_struct), | |
2361 | .setup = tun_setup, | |
2362 | .validate = tun_validate, | |
1ec010e7 SD |
2363 | .get_size = tun_get_size, |
2364 | .fill_info = tun_fill_info, | |
f019a7a5 EB |
2365 | }; |
2366 | ||
33dccbb0 HX |
2367 | static void tun_sock_write_space(struct sock *sk) |
2368 | { | |
54f968d6 | 2369 | struct tun_file *tfile; |
43815482 | 2370 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
2371 | |
2372 | if (!sock_writeable(sk)) | |
2373 | return; | |
2374 | ||
9cd3e072 | 2375 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
33dccbb0 HX |
2376 | return; |
2377 | ||
43815482 ED |
2378 | wqueue = sk_sleep(sk); |
2379 | if (wqueue && waitqueue_active(wqueue)) | |
a9a08845 LT |
2380 | wake_up_interruptible_sync_poll(wqueue, EPOLLOUT | |
2381 | EPOLLWRNORM | EPOLLWRBAND); | |
c722c625 | 2382 | |
54f968d6 JW |
2383 | tfile = container_of(sk, struct tun_file, sk); |
2384 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
2385 | } |
2386 | ||
043d222f JW |
2387 | static int tun_xdp_one(struct tun_struct *tun, |
2388 | struct tun_file *tfile, | |
2389 | struct xdp_buff *xdp, int *flush) | |
2390 | { | |
2391 | struct tun_xdp_hdr *hdr = xdp->data_hard_start; | |
2392 | struct virtio_net_hdr *gso = &hdr->gso; | |
2393 | struct tun_pcpu_stats *stats; | |
2394 | struct bpf_prog *xdp_prog; | |
2395 | struct sk_buff *skb = NULL; | |
2396 | u32 rxhash = 0, act; | |
2397 | int buflen = hdr->buflen; | |
2398 | int err = 0; | |
2399 | bool skb_xdp = false; | |
2400 | ||
2401 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
2402 | if (xdp_prog) { | |
2403 | if (gso->gso_type) { | |
2404 | skb_xdp = true; | |
2405 | goto build; | |
2406 | } | |
2407 | xdp_set_data_meta_invalid(xdp); | |
2408 | xdp->rxq = &tfile->xdp_rxq; | |
2409 | ||
2410 | act = bpf_prog_run_xdp(xdp_prog, xdp); | |
2411 | err = tun_xdp_act(tun, xdp_prog, xdp, act); | |
2412 | if (err < 0) { | |
2413 | put_page(virt_to_head_page(xdp->data)); | |
2414 | return err; | |
2415 | } | |
2416 | ||
2417 | switch (err) { | |
2418 | case XDP_REDIRECT: | |
2419 | *flush = true; | |
2420 | /* fall through */ | |
2421 | case XDP_TX: | |
2422 | return 0; | |
2423 | case XDP_PASS: | |
2424 | break; | |
2425 | default: | |
2426 | put_page(virt_to_head_page(xdp->data)); | |
2427 | return 0; | |
2428 | } | |
2429 | } | |
2430 | ||
2431 | build: | |
2432 | skb = build_skb(xdp->data_hard_start, buflen); | |
2433 | if (!skb) { | |
2434 | err = -ENOMEM; | |
2435 | goto out; | |
2436 | } | |
2437 | ||
2438 | skb_reserve(skb, xdp->data - xdp->data_hard_start); | |
2439 | skb_put(skb, xdp->data_end - xdp->data); | |
2440 | ||
2441 | if (virtio_net_hdr_to_skb(skb, gso, tun_is_little_endian(tun))) { | |
2442 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); | |
2443 | kfree_skb(skb); | |
2444 | err = -EINVAL; | |
2445 | goto out; | |
2446 | } | |
2447 | ||
2448 | skb->protocol = eth_type_trans(skb, tun->dev); | |
2449 | skb_reset_network_header(skb); | |
2450 | skb_probe_transport_header(skb, 0); | |
2451 | ||
2452 | if (skb_xdp) { | |
2453 | err = do_xdp_generic(xdp_prog, skb); | |
2454 | if (err != XDP_PASS) | |
2455 | goto out; | |
2456 | } | |
2457 | ||
2458 | if (!rcu_dereference(tun->steering_prog)) | |
2459 | rxhash = __skb_get_hash_symmetric(skb); | |
2460 | ||
2461 | netif_receive_skb(skb); | |
2462 | ||
2463 | stats = get_cpu_ptr(tun->pcpu_stats); | |
2464 | u64_stats_update_begin(&stats->syncp); | |
2465 | stats->rx_packets++; | |
2466 | stats->rx_bytes += skb->len; | |
2467 | u64_stats_update_end(&stats->syncp); | |
2468 | put_cpu_ptr(stats); | |
2469 | ||
2470 | if (rxhash) | |
2471 | tun_flow_update(tun, rxhash, tfile); | |
2472 | ||
2473 | out: | |
2474 | return err; | |
2475 | } | |
2476 | ||
1b784140 | 2477 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 2478 | { |
043d222f | 2479 | int ret, i; |
54f968d6 | 2480 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
9484dc74 | 2481 | struct tun_struct *tun = tun_get(tfile); |
fe8dd45b | 2482 | struct tun_msg_ctl *ctl = m->msg_control; |
043d222f | 2483 | struct xdp_buff *xdp; |
54f968d6 JW |
2484 | |
2485 | if (!tun) | |
2486 | return -EBADFD; | |
f5ff53b4 | 2487 | |
043d222f JW |
2488 | if (ctl && (ctl->type == TUN_MSG_PTR)) { |
2489 | int n = ctl->num; | |
2490 | int flush = 0; | |
2491 | ||
2492 | local_bh_disable(); | |
2493 | rcu_read_lock(); | |
2494 | ||
2495 | for (i = 0; i < n; i++) { | |
2496 | xdp = &((struct xdp_buff *)ctl->ptr)[i]; | |
2497 | tun_xdp_one(tun, tfile, xdp, &flush); | |
2498 | } | |
2499 | ||
2500 | if (flush) | |
2501 | xdp_do_flush_map(); | |
2502 | ||
2503 | rcu_read_unlock(); | |
2504 | local_bh_enable(); | |
2505 | ||
2506 | ret = total_len; | |
2507 | goto out; | |
2508 | } | |
fe8dd45b JW |
2509 | |
2510 | ret = tun_get_user(tun, tfile, ctl ? ctl->ptr : NULL, &m->msg_iter, | |
5503fcec JW |
2511 | m->msg_flags & MSG_DONTWAIT, |
2512 | m->msg_flags & MSG_MORE); | |
043d222f | 2513 | out: |
54f968d6 JW |
2514 | tun_put(tun); |
2515 | return ret; | |
05c2828c MT |
2516 | } |
2517 | ||
1b784140 | 2518 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
2519 | int flags) |
2520 | { | |
54f968d6 | 2521 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
9484dc74 | 2522 | struct tun_struct *tun = tun_get(tfile); |
fc72d1d5 | 2523 | void *ptr = m->msg_control; |
05c2828c | 2524 | int ret; |
54f968d6 | 2525 | |
c33ee15b WX |
2526 | if (!tun) { |
2527 | ret = -EBADFD; | |
fc72d1d5 | 2528 | goto out_free; |
c33ee15b | 2529 | } |
54f968d6 | 2530 | |
eda29772 | 2531 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 | 2532 | ret = -EINVAL; |
c33ee15b | 2533 | goto out_put_tun; |
3811ae76 | 2534 | } |
eda29772 RC |
2535 | if (flags & MSG_ERRQUEUE) { |
2536 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
2537 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
2538 | goto out; | |
2539 | } | |
fc72d1d5 | 2540 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, ptr); |
87897931 | 2541 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
2542 | m->msg_flags |= MSG_TRUNC; |
2543 | ret = flags & MSG_TRUNC ? ret : total_len; | |
2544 | } | |
3811ae76 | 2545 | out: |
54f968d6 | 2546 | tun_put(tun); |
05c2828c | 2547 | return ret; |
c33ee15b WX |
2548 | |
2549 | out_put_tun: | |
2550 | tun_put(tun); | |
fc72d1d5 JW |
2551 | out_free: |
2552 | tun_ptr_free(ptr); | |
c33ee15b | 2553 | return ret; |
05c2828c MT |
2554 | } |
2555 | ||
fc72d1d5 JW |
2556 | static int tun_ptr_peek_len(void *ptr) |
2557 | { | |
2558 | if (likely(ptr)) { | |
1ffcbc85 JDB |
2559 | if (tun_is_xdp_frame(ptr)) { |
2560 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2561 | |
1ffcbc85 | 2562 | return xdpf->len; |
fc72d1d5 JW |
2563 | } |
2564 | return __skb_array_len_with_tag(ptr); | |
2565 | } else { | |
2566 | return 0; | |
2567 | } | |
2568 | } | |
2569 | ||
1576d986 JW |
2570 | static int tun_peek_len(struct socket *sock) |
2571 | { | |
2572 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
2573 | struct tun_struct *tun; | |
2574 | int ret = 0; | |
2575 | ||
9484dc74 | 2576 | tun = tun_get(tfile); |
1576d986 JW |
2577 | if (!tun) |
2578 | return 0; | |
2579 | ||
fc72d1d5 | 2580 | ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, tun_ptr_peek_len); |
1576d986 JW |
2581 | tun_put(tun); |
2582 | ||
2583 | return ret; | |
2584 | } | |
2585 | ||
05c2828c MT |
2586 | /* Ops structure to mimic raw sockets with tun */ |
2587 | static const struct proto_ops tun_socket_ops = { | |
1576d986 | 2588 | .peek_len = tun_peek_len, |
05c2828c MT |
2589 | .sendmsg = tun_sendmsg, |
2590 | .recvmsg = tun_recvmsg, | |
2591 | }; | |
2592 | ||
33dccbb0 HX |
2593 | static struct proto tun_proto = { |
2594 | .name = "tun", | |
2595 | .owner = THIS_MODULE, | |
54f968d6 | 2596 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 2597 | }; |
f019a7a5 | 2598 | |
980c9e8c DW |
2599 | static int tun_flags(struct tun_struct *tun) |
2600 | { | |
031f5e03 | 2601 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
2602 | } |
2603 | ||
2604 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
2605 | char *buf) | |
2606 | { | |
2607 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
2608 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
2609 | } | |
2610 | ||
2611 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
2612 | char *buf) | |
2613 | { | |
2614 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
2615 | return uid_valid(tun->owner)? |
2616 | sprintf(buf, "%u\n", | |
2617 | from_kuid_munged(current_user_ns(), tun->owner)): | |
2618 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
2619 | } |
2620 | ||
2621 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
2622 | char *buf) | |
2623 | { | |
2624 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
2625 | return gid_valid(tun->group) ? |
2626 | sprintf(buf, "%u\n", | |
2627 | from_kgid_munged(current_user_ns(), tun->group)): | |
2628 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
2629 | } |
2630 | ||
2631 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
2632 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
2633 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
2634 | ||
c4d33e24 TI |
2635 | static struct attribute *tun_dev_attrs[] = { |
2636 | &dev_attr_tun_flags.attr, | |
2637 | &dev_attr_owner.attr, | |
2638 | &dev_attr_group.attr, | |
2639 | NULL | |
2640 | }; | |
2641 | ||
2642 | static const struct attribute_group tun_attr_group = { | |
2643 | .attrs = tun_dev_attrs | |
2644 | }; | |
2645 | ||
d647a591 | 2646 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
2647 | { |
2648 | struct tun_struct *tun; | |
54f968d6 | 2649 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2650 | struct net_device *dev; |
2651 | int err; | |
2652 | ||
7c0c3b1a JW |
2653 | if (tfile->detached) |
2654 | return -EINVAL; | |
2655 | ||
90e33d45 PP |
2656 | if ((ifr->ifr_flags & IFF_NAPI_FRAGS)) { |
2657 | if (!capable(CAP_NET_ADMIN)) | |
2658 | return -EPERM; | |
2659 | ||
2660 | if (!(ifr->ifr_flags & IFF_NAPI) || | |
2661 | (ifr->ifr_flags & TUN_TYPE_MASK) != IFF_TAP) | |
2662 | return -EINVAL; | |
2663 | } | |
2664 | ||
74a3e5a7 EB |
2665 | dev = __dev_get_by_name(net, ifr->ifr_name); |
2666 | if (dev) { | |
f85ba780 DW |
2667 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
2668 | return -EBUSY; | |
74a3e5a7 EB |
2669 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
2670 | tun = netdev_priv(dev); | |
2671 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
2672 | tun = netdev_priv(dev); | |
2673 | else | |
2674 | return -EINVAL; | |
2675 | ||
8e6d91ae | 2676 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 2677 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
2678 | return -EINVAL; |
2679 | ||
cde8b15f | 2680 | if (tun_not_capable(tun)) |
2b980dbd | 2681 | return -EPERM; |
5dbbaf2d | 2682 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
2683 | if (err < 0) |
2684 | return err; | |
2685 | ||
94317099 | 2686 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER, |
af3fb24e ED |
2687 | ifr->ifr_flags & IFF_NAPI, |
2688 | ifr->ifr_flags & IFF_NAPI_FRAGS); | |
a7385ba2 EB |
2689 | if (err < 0) |
2690 | return err; | |
4008e97f | 2691 | |
40630b82 | 2692 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
2693 | (tun->numqueues + tun->numdisabled > 1)) { |
2694 | /* One or more queue has already been attached, no need | |
2695 | * to initialize the device again. | |
2696 | */ | |
83c1f36f | 2697 | netdev_state_change(dev); |
e8dbad66 JW |
2698 | return 0; |
2699 | } | |
9fffc5c6 SD |
2700 | |
2701 | tun->flags = (tun->flags & ~TUN_FEATURES) | | |
2702 | (ifr->ifr_flags & TUN_FEATURES); | |
83c1f36f SD |
2703 | |
2704 | netdev_state_change(dev); | |
2705 | } else { | |
1da177e4 LT |
2706 | char *name; |
2707 | unsigned long flags = 0; | |
edfb6a14 JW |
2708 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
2709 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 2710 | |
c260b772 | 2711 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 2712 | return -EPERM; |
2b980dbd PM |
2713 | err = security_tun_dev_create(); |
2714 | if (err < 0) | |
2715 | return err; | |
ca6bb5d7 | 2716 | |
1da177e4 LT |
2717 | /* Set dev type */ |
2718 | if (ifr->ifr_flags & IFF_TUN) { | |
2719 | /* TUN device */ | |
40630b82 | 2720 | flags |= IFF_TUN; |
1da177e4 LT |
2721 | name = "tun%d"; |
2722 | } else if (ifr->ifr_flags & IFF_TAP) { | |
2723 | /* TAP device */ | |
40630b82 | 2724 | flags |= IFF_TAP; |
1da177e4 | 2725 | name = "tap%d"; |
6aa20a22 | 2726 | } else |
36989b90 | 2727 | return -EINVAL; |
6aa20a22 | 2728 | |
1da177e4 LT |
2729 | if (*ifr->ifr_name) |
2730 | name = ifr->ifr_name; | |
2731 | ||
c8d68e6b | 2732 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
2733 | NET_NAME_UNKNOWN, tun_setup, queues, |
2734 | queues); | |
edfb6a14 | 2735 | |
1da177e4 LT |
2736 | if (!dev) |
2737 | return -ENOMEM; | |
0ad646c8 | 2738 | err = dev_get_valid_name(net, dev, name); |
5c25f65f | 2739 | if (err < 0) |
0ad646c8 | 2740 | goto err_free_dev; |
1da177e4 | 2741 | |
fc54c658 | 2742 | dev_net_set(dev, net); |
f019a7a5 | 2743 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 2744 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 2745 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 2746 | |
1da177e4 LT |
2747 | tun = netdev_priv(dev); |
2748 | tun->dev = dev; | |
2749 | tun->flags = flags; | |
f271b2cc | 2750 | tun->txflt.count = 0; |
d9d52b51 | 2751 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 2752 | |
eaea34b2 | 2753 | tun->align = NET_SKB_PAD; |
54f968d6 JW |
2754 | tun->filter_attached = false; |
2755 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
5503fcec | 2756 | tun->rx_batched = 0; |
96f84061 | 2757 | RCU_INIT_POINTER(tun->steering_prog, NULL); |
33dccbb0 | 2758 | |
608b9977 PA |
2759 | tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); |
2760 | if (!tun->pcpu_stats) { | |
2761 | err = -ENOMEM; | |
2762 | goto err_free_dev; | |
2763 | } | |
2764 | ||
96442e42 JW |
2765 | spin_lock_init(&tun->lock); |
2766 | ||
5dbbaf2d PM |
2767 | err = security_tun_dev_alloc_security(&tun->security); |
2768 | if (err < 0) | |
608b9977 | 2769 | goto err_free_stat; |
2b980dbd | 2770 | |
1da177e4 | 2771 | tun_net_init(dev); |
944a1376 | 2772 | tun_flow_init(tun); |
96442e42 | 2773 | |
88255375 | 2774 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
2775 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
2776 | NETIF_F_HW_VLAN_STAG_TX; | |
2a2bbf17 | 2777 | dev->features = dev->hw_features | NETIF_F_LLTX; |
6671b224 FLVC |
2778 | dev->vlan_features = dev->features & |
2779 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
2780 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 2781 | |
9fffc5c6 SD |
2782 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
2783 | (ifr->ifr_flags & TUN_FEATURES); | |
2784 | ||
4008e97f | 2785 | INIT_LIST_HEAD(&tun->disabled); |
af3fb24e ED |
2786 | err = tun_attach(tun, file, false, ifr->ifr_flags & IFF_NAPI, |
2787 | ifr->ifr_flags & IFF_NAPI_FRAGS); | |
eb0fb363 | 2788 | if (err < 0) |
662ca437 | 2789 | goto err_free_flow; |
eb0fb363 | 2790 | |
1da177e4 LT |
2791 | err = register_netdevice(tun->dev); |
2792 | if (err < 0) | |
662ca437 | 2793 | goto err_detach; |
1da177e4 LT |
2794 | } |
2795 | ||
af668b3c MT |
2796 | netif_carrier_on(tun->dev); |
2797 | ||
6b8a66ee | 2798 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 2799 | |
e35259a9 MK |
2800 | /* Make sure persistent devices do not get stuck in |
2801 | * xoff state. | |
2802 | */ | |
2803 | if (netif_running(tun->dev)) | |
c8d68e6b | 2804 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 2805 | |
1da177e4 LT |
2806 | strcpy(ifr->ifr_name, tun->dev->name); |
2807 | return 0; | |
2808 | ||
662ca437 JW |
2809 | err_detach: |
2810 | tun_detach_all(dev); | |
ff244c6b ED |
2811 | /* register_netdevice() already called tun_free_netdev() */ |
2812 | goto err_free_dev; | |
2813 | ||
662ca437 JW |
2814 | err_free_flow: |
2815 | tun_flow_uninit(tun); | |
2816 | security_tun_dev_free_security(tun->security); | |
608b9977 PA |
2817 | err_free_stat: |
2818 | free_percpu(tun->pcpu_stats); | |
662ca437 | 2819 | err_free_dev: |
1da177e4 | 2820 | free_netdev(dev); |
1da177e4 LT |
2821 | return err; |
2822 | } | |
2823 | ||
9ce99cf6 | 2824 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 2825 | struct ifreq *ifr) |
e3b99556 | 2826 | { |
6b8a66ee | 2827 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
2828 | |
2829 | strcpy(ifr->ifr_name, tun->dev->name); | |
2830 | ||
980c9e8c | 2831 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 2832 | |
e3b99556 MM |
2833 | } |
2834 | ||
5228ddc9 RR |
2835 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
2836 | * privs required. */ | |
88255375 | 2837 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 2838 | { |
c8f44aff | 2839 | netdev_features_t features = 0; |
5228ddc9 RR |
2840 | |
2841 | if (arg & TUN_F_CSUM) { | |
88255375 | 2842 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
2843 | arg &= ~TUN_F_CSUM; |
2844 | ||
2845 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
2846 | if (arg & TUN_F_TSO_ECN) { | |
2847 | features |= NETIF_F_TSO_ECN; | |
2848 | arg &= ~TUN_F_TSO_ECN; | |
2849 | } | |
2850 | if (arg & TUN_F_TSO4) | |
2851 | features |= NETIF_F_TSO; | |
2852 | if (arg & TUN_F_TSO6) | |
2853 | features |= NETIF_F_TSO6; | |
2854 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
2855 | } | |
0c19f846 WB |
2856 | |
2857 | arg &= ~TUN_F_UFO; | |
5228ddc9 RR |
2858 | } |
2859 | ||
2860 | /* This gives the user a way to test for new features in future by | |
2861 | * trying to set them. */ | |
2862 | if (arg) | |
2863 | return -EINVAL; | |
2864 | ||
88255375 | 2865 | tun->set_features = features; |
09050957 YI |
2866 | tun->dev->wanted_features &= ~TUN_USER_FEATURES; |
2867 | tun->dev->wanted_features |= features; | |
88255375 | 2868 | netdev_update_features(tun->dev); |
5228ddc9 RR |
2869 | |
2870 | return 0; | |
2871 | } | |
2872 | ||
c8d68e6b JW |
2873 | static void tun_detach_filter(struct tun_struct *tun, int n) |
2874 | { | |
2875 | int i; | |
2876 | struct tun_file *tfile; | |
2877 | ||
2878 | for (i = 0; i < n; i++) { | |
b8deabd3 | 2879 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2880 | lock_sock(tfile->socket.sk); |
2881 | sk_detach_filter(tfile->socket.sk); | |
2882 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2883 | } |
2884 | ||
2885 | tun->filter_attached = false; | |
2886 | } | |
2887 | ||
2888 | static int tun_attach_filter(struct tun_struct *tun) | |
2889 | { | |
2890 | int i, ret = 0; | |
2891 | struct tun_file *tfile; | |
2892 | ||
2893 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2894 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2895 | lock_sock(tfile->socket.sk); |
2896 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
2897 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2898 | if (ret) { |
2899 | tun_detach_filter(tun, i); | |
2900 | return ret; | |
2901 | } | |
2902 | } | |
2903 | ||
2904 | tun->filter_attached = true; | |
2905 | return ret; | |
2906 | } | |
2907 | ||
2908 | static void tun_set_sndbuf(struct tun_struct *tun) | |
2909 | { | |
2910 | struct tun_file *tfile; | |
2911 | int i; | |
2912 | ||
2913 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2914 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
2915 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
2916 | } | |
2917 | } | |
2918 | ||
cde8b15f JW |
2919 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
2920 | { | |
2921 | struct tun_file *tfile = file->private_data; | |
2922 | struct tun_struct *tun; | |
cde8b15f JW |
2923 | int ret = 0; |
2924 | ||
2925 | rtnl_lock(); | |
2926 | ||
2927 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 2928 | tun = tfile->detached; |
5dbbaf2d | 2929 | if (!tun) { |
cde8b15f | 2930 | ret = -EINVAL; |
5dbbaf2d PM |
2931 | goto unlock; |
2932 | } | |
2933 | ret = security_tun_dev_attach_queue(tun->security); | |
2934 | if (ret < 0) | |
2935 | goto unlock; | |
af3fb24e ED |
2936 | ret = tun_attach(tun, file, false, tun->flags & IFF_NAPI, |
2937 | tun->flags & IFF_NAPI_FRAGS); | |
4008e97f | 2938 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 2939 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 2940 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
2941 | ret = -EINVAL; |
2942 | else | |
2943 | __tun_detach(tfile, false); | |
2944 | } else | |
cde8b15f JW |
2945 | ret = -EINVAL; |
2946 | ||
83c1f36f SD |
2947 | if (ret >= 0) |
2948 | netdev_state_change(tun->dev); | |
2949 | ||
5dbbaf2d | 2950 | unlock: |
cde8b15f JW |
2951 | rtnl_unlock(); |
2952 | return ret; | |
2953 | } | |
2954 | ||
cd5681d7 JW |
2955 | static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog **prog_p, |
2956 | void __user *data) | |
96f84061 JW |
2957 | { |
2958 | struct bpf_prog *prog; | |
2959 | int fd; | |
2960 | ||
2961 | if (copy_from_user(&fd, data, sizeof(fd))) | |
2962 | return -EFAULT; | |
2963 | ||
2964 | if (fd == -1) { | |
2965 | prog = NULL; | |
2966 | } else { | |
2967 | prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); | |
2968 | if (IS_ERR(prog)) | |
2969 | return PTR_ERR(prog); | |
2970 | } | |
2971 | ||
cd5681d7 | 2972 | return __tun_set_ebpf(tun, prog_p, prog); |
96f84061 JW |
2973 | } |
2974 | ||
50857e2a AB |
2975 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
2976 | unsigned long arg, int ifreq_len) | |
1da177e4 | 2977 | { |
36b50bab | 2978 | struct tun_file *tfile = file->private_data; |
f663706a | 2979 | struct net *net = sock_net(&tfile->sk); |
631ab46b | 2980 | struct tun_struct *tun; |
1da177e4 LT |
2981 | void __user* argp = (void __user*)arg; |
2982 | struct ifreq ifr; | |
0625c883 EB |
2983 | kuid_t owner; |
2984 | kgid_t group; | |
33dccbb0 | 2985 | int sndbuf; |
d9d52b51 | 2986 | int vnet_hdr_sz; |
fb7589a1 | 2987 | unsigned int ifindex; |
1cf8e410 | 2988 | int le; |
f271b2cc | 2989 | int ret; |
83c1f36f | 2990 | bool do_notify = false; |
1da177e4 | 2991 | |
f2780d6d KT |
2992 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || |
2993 | (_IOC_TYPE(cmd) == SOCK_IOC_TYPE && cmd != SIOCGSKNS)) { | |
50857e2a | 2994 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 2995 | return -EFAULT; |
8bbb1813 | 2996 | } else { |
a117dacd | 2997 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 2998 | } |
631ab46b EB |
2999 | if (cmd == TUNGETFEATURES) { |
3000 | /* Currently this just means: "what IFF flags are valid?". | |
3001 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
3002 | * TUNSETIFF. |
3003 | */ | |
3004 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 3005 | (unsigned int __user*)argp); |
f663706a | 3006 | } else if (cmd == TUNSETQUEUE) { |
cde8b15f | 3007 | return tun_set_queue(file, &ifr); |
f663706a KT |
3008 | } else if (cmd == SIOCGSKNS) { |
3009 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
3010 | return -EPERM; | |
3011 | return open_related_ns(&net->ns, get_net_ns); | |
3012 | } | |
631ab46b | 3013 | |
c8d68e6b | 3014 | ret = 0; |
876bfd4d HX |
3015 | rtnl_lock(); |
3016 | ||
9484dc74 | 3017 | tun = tun_get(tfile); |
0f16bc13 GF |
3018 | if (cmd == TUNSETIFF) { |
3019 | ret = -EEXIST; | |
3020 | if (tun) | |
3021 | goto unlock; | |
3022 | ||
1da177e4 LT |
3023 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
3024 | ||
f2780d6d | 3025 | ret = tun_set_iff(net, file, &ifr); |
1da177e4 | 3026 | |
876bfd4d HX |
3027 | if (ret) |
3028 | goto unlock; | |
1da177e4 | 3029 | |
50857e2a | 3030 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
3031 | ret = -EFAULT; |
3032 | goto unlock; | |
1da177e4 | 3033 | } |
fb7589a1 PE |
3034 | if (cmd == TUNSETIFINDEX) { |
3035 | ret = -EPERM; | |
3036 | if (tun) | |
3037 | goto unlock; | |
3038 | ||
3039 | ret = -EFAULT; | |
3040 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
3041 | goto unlock; | |
3042 | ||
3043 | ret = 0; | |
3044 | tfile->ifindex = ifindex; | |
3045 | goto unlock; | |
3046 | } | |
1da177e4 | 3047 | |
876bfd4d | 3048 | ret = -EBADFD; |
1da177e4 | 3049 | if (!tun) |
876bfd4d | 3050 | goto unlock; |
1da177e4 | 3051 | |
1e588338 | 3052 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 3053 | |
631ab46b | 3054 | ret = 0; |
1da177e4 | 3055 | switch (cmd) { |
e3b99556 | 3056 | case TUNGETIFF: |
9ce99cf6 | 3057 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 3058 | |
3d407a80 PE |
3059 | if (tfile->detached) |
3060 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
3061 | if (!tfile->socket.sk->sk_filter) |
3062 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 3063 | |
50857e2a | 3064 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 3065 | ret = -EFAULT; |
e3b99556 MM |
3066 | break; |
3067 | ||
1da177e4 LT |
3068 | case TUNSETNOCSUM: |
3069 | /* Disable/Enable checksum */ | |
1da177e4 | 3070 | |
88255375 MM |
3071 | /* [unimplemented] */ |
3072 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 3073 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
3074 | break; |
3075 | ||
3076 | case TUNSETPERSIST: | |
54f968d6 JW |
3077 | /* Disable/Enable persist mode. Keep an extra reference to the |
3078 | * module to prevent the module being unprobed. | |
3079 | */ | |
40630b82 MT |
3080 | if (arg && !(tun->flags & IFF_PERSIST)) { |
3081 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 3082 | __module_get(THIS_MODULE); |
83c1f36f | 3083 | do_notify = true; |
dd38bd85 | 3084 | } |
40630b82 MT |
3085 | if (!arg && (tun->flags & IFF_PERSIST)) { |
3086 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 | 3087 | module_put(THIS_MODULE); |
83c1f36f | 3088 | do_notify = true; |
54f968d6 | 3089 | } |
1da177e4 | 3090 | |
6b8a66ee JP |
3091 | tun_debug(KERN_INFO, tun, "persist %s\n", |
3092 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
3093 | break; |
3094 | ||
3095 | case TUNSETOWNER: | |
3096 | /* Set owner of the device */ | |
0625c883 EB |
3097 | owner = make_kuid(current_user_ns(), arg); |
3098 | if (!uid_valid(owner)) { | |
3099 | ret = -EINVAL; | |
3100 | break; | |
3101 | } | |
3102 | tun->owner = owner; | |
83c1f36f | 3103 | do_notify = true; |
1e588338 | 3104 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 3105 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
3106 | break; |
3107 | ||
8c644623 GG |
3108 | case TUNSETGROUP: |
3109 | /* Set group of the device */ | |
0625c883 EB |
3110 | group = make_kgid(current_user_ns(), arg); |
3111 | if (!gid_valid(group)) { | |
3112 | ret = -EINVAL; | |
3113 | break; | |
3114 | } | |
3115 | tun->group = group; | |
83c1f36f | 3116 | do_notify = true; |
1e588338 | 3117 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 3118 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
3119 | break; |
3120 | ||
ff4cc3ac MK |
3121 | case TUNSETLINK: |
3122 | /* Only allow setting the type when the interface is down */ | |
3123 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
3124 | tun_debug(KERN_INFO, tun, |
3125 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 3126 | ret = -EBUSY; |
ff4cc3ac MK |
3127 | } else { |
3128 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
3129 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
3130 | tun->dev->type); | |
48abfe05 | 3131 | ret = 0; |
ff4cc3ac | 3132 | } |
631ab46b | 3133 | break; |
ff4cc3ac | 3134 | |
1da177e4 LT |
3135 | #ifdef TUN_DEBUG |
3136 | case TUNSETDEBUG: | |
3137 | tun->debug = arg; | |
3138 | break; | |
3139 | #endif | |
5228ddc9 | 3140 | case TUNSETOFFLOAD: |
88255375 | 3141 | ret = set_offload(tun, arg); |
631ab46b | 3142 | break; |
5228ddc9 | 3143 | |
f271b2cc MK |
3144 | case TUNSETTXFILTER: |
3145 | /* Can be set only for TAPs */ | |
631ab46b | 3146 | ret = -EINVAL; |
40630b82 | 3147 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 3148 | break; |
c0e5a8c2 | 3149 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 3150 | break; |
1da177e4 LT |
3151 | |
3152 | case SIOCGIFHWADDR: | |
b595076a | 3153 | /* Get hw address */ |
f271b2cc MK |
3154 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
3155 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 3156 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
3157 | ret = -EFAULT; |
3158 | break; | |
1da177e4 LT |
3159 | |
3160 | case SIOCSIFHWADDR: | |
f271b2cc | 3161 | /* Set hw address */ |
6b8a66ee JP |
3162 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
3163 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 3164 | |
40102371 | 3165 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 3166 | break; |
33dccbb0 HX |
3167 | |
3168 | case TUNGETSNDBUF: | |
54f968d6 | 3169 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
3170 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
3171 | ret = -EFAULT; | |
3172 | break; | |
3173 | ||
3174 | case TUNSETSNDBUF: | |
3175 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
3176 | ret = -EFAULT; | |
3177 | break; | |
3178 | } | |
93161922 CG |
3179 | if (sndbuf <= 0) { |
3180 | ret = -EINVAL; | |
3181 | break; | |
3182 | } | |
33dccbb0 | 3183 | |
c8d68e6b JW |
3184 | tun->sndbuf = sndbuf; |
3185 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
3186 | break; |
3187 | ||
d9d52b51 MT |
3188 | case TUNGETVNETHDRSZ: |
3189 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
3190 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
3191 | ret = -EFAULT; | |
3192 | break; | |
3193 | ||
3194 | case TUNSETVNETHDRSZ: | |
3195 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
3196 | ret = -EFAULT; | |
3197 | break; | |
3198 | } | |
3199 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
3200 | ret = -EINVAL; | |
3201 | break; | |
3202 | } | |
3203 | ||
3204 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
3205 | break; | |
3206 | ||
1cf8e410 MT |
3207 | case TUNGETVNETLE: |
3208 | le = !!(tun->flags & TUN_VNET_LE); | |
3209 | if (put_user(le, (int __user *)argp)) | |
3210 | ret = -EFAULT; | |
3211 | break; | |
3212 | ||
3213 | case TUNSETVNETLE: | |
3214 | if (get_user(le, (int __user *)argp)) { | |
3215 | ret = -EFAULT; | |
3216 | break; | |
3217 | } | |
3218 | if (le) | |
3219 | tun->flags |= TUN_VNET_LE; | |
3220 | else | |
3221 | tun->flags &= ~TUN_VNET_LE; | |
3222 | break; | |
3223 | ||
8b8e658b GK |
3224 | case TUNGETVNETBE: |
3225 | ret = tun_get_vnet_be(tun, argp); | |
3226 | break; | |
3227 | ||
3228 | case TUNSETVNETBE: | |
3229 | ret = tun_set_vnet_be(tun, argp); | |
3230 | break; | |
3231 | ||
99405162 MT |
3232 | case TUNATTACHFILTER: |
3233 | /* Can be set only for TAPs */ | |
3234 | ret = -EINVAL; | |
40630b82 | 3235 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
3236 | break; |
3237 | ret = -EFAULT; | |
54f968d6 | 3238 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
3239 | break; |
3240 | ||
c8d68e6b | 3241 | ret = tun_attach_filter(tun); |
99405162 MT |
3242 | break; |
3243 | ||
3244 | case TUNDETACHFILTER: | |
3245 | /* Can be set only for TAPs */ | |
3246 | ret = -EINVAL; | |
40630b82 | 3247 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 3248 | break; |
c8d68e6b JW |
3249 | ret = 0; |
3250 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
3251 | break; |
3252 | ||
76975e9c PE |
3253 | case TUNGETFILTER: |
3254 | ret = -EINVAL; | |
40630b82 | 3255 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
3256 | break; |
3257 | ret = -EFAULT; | |
3258 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
3259 | break; | |
3260 | ret = 0; | |
3261 | break; | |
3262 | ||
96f84061 | 3263 | case TUNSETSTEERINGEBPF: |
cd5681d7 | 3264 | ret = tun_set_ebpf(tun, &tun->steering_prog, argp); |
96f84061 JW |
3265 | break; |
3266 | ||
aff3d70a JW |
3267 | case TUNSETFILTEREBPF: |
3268 | ret = tun_set_ebpf(tun, &tun->filter_prog, argp); | |
3269 | break; | |
3270 | ||
1da177e4 | 3271 | default: |
631ab46b EB |
3272 | ret = -EINVAL; |
3273 | break; | |
ee289b64 | 3274 | } |
1da177e4 | 3275 | |
83c1f36f SD |
3276 | if (do_notify) |
3277 | netdev_state_change(tun->dev); | |
3278 | ||
876bfd4d HX |
3279 | unlock: |
3280 | rtnl_unlock(); | |
3281 | if (tun) | |
3282 | tun_put(tun); | |
631ab46b | 3283 | return ret; |
1da177e4 LT |
3284 | } |
3285 | ||
50857e2a AB |
3286 | static long tun_chr_ioctl(struct file *file, |
3287 | unsigned int cmd, unsigned long arg) | |
3288 | { | |
3289 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
3290 | } | |
3291 | ||
3292 | #ifdef CONFIG_COMPAT | |
3293 | static long tun_chr_compat_ioctl(struct file *file, | |
3294 | unsigned int cmd, unsigned long arg) | |
3295 | { | |
3296 | switch (cmd) { | |
3297 | case TUNSETIFF: | |
3298 | case TUNGETIFF: | |
3299 | case TUNSETTXFILTER: | |
3300 | case TUNGETSNDBUF: | |
3301 | case TUNSETSNDBUF: | |
3302 | case SIOCGIFHWADDR: | |
3303 | case SIOCSIFHWADDR: | |
3304 | arg = (unsigned long)compat_ptr(arg); | |
3305 | break; | |
3306 | default: | |
3307 | arg = (compat_ulong_t)arg; | |
3308 | break; | |
3309 | } | |
3310 | ||
3311 | /* | |
3312 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
3313 | * the end of that structure. All fields that are used in this | |
3314 | * driver are compatible though, we don't need to convert the | |
3315 | * contents. | |
3316 | */ | |
3317 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
3318 | } | |
3319 | #endif /* CONFIG_COMPAT */ | |
3320 | ||
1da177e4 LT |
3321 | static int tun_chr_fasync(int fd, struct file *file, int on) |
3322 | { | |
54f968d6 | 3323 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
3324 | int ret; |
3325 | ||
54f968d6 | 3326 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 3327 | goto out; |
6aa20a22 | 3328 | |
1da177e4 | 3329 | if (on) { |
01919134 | 3330 | __f_setown(file, task_pid(current), PIDTYPE_TGID, 0); |
54f968d6 | 3331 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 3332 | } else |
54f968d6 | 3333 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
3334 | ret = 0; |
3335 | out: | |
9d319522 | 3336 | return ret; |
1da177e4 LT |
3337 | } |
3338 | ||
3339 | static int tun_chr_open(struct inode *inode, struct file * file) | |
3340 | { | |
140e807d | 3341 | struct net *net = current->nsproxy->net_ns; |
631ab46b | 3342 | struct tun_file *tfile; |
deed49fb | 3343 | |
6b8a66ee | 3344 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 3345 | |
140e807d | 3346 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
11aa9c28 | 3347 | &tun_proto, 0); |
631ab46b EB |
3348 | if (!tfile) |
3349 | return -ENOMEM; | |
b196d88a JW |
3350 | if (ptr_ring_init(&tfile->tx_ring, 0, GFP_KERNEL)) { |
3351 | sk_free(&tfile->sk); | |
3352 | return -ENOMEM; | |
3353 | } | |
3354 | ||
c7256f57 | 3355 | mutex_init(&tfile->napi_mutex); |
c956674b | 3356 | RCU_INIT_POINTER(tfile->tun, NULL); |
54f968d6 | 3357 | tfile->flags = 0; |
fb7589a1 | 3358 | tfile->ifindex = 0; |
54f968d6 | 3359 | |
54f968d6 | 3360 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 3361 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
3362 | |
3363 | tfile->socket.file = file; | |
3364 | tfile->socket.ops = &tun_socket_ops; | |
3365 | ||
3366 | sock_init_data(&tfile->socket, &tfile->sk); | |
54f968d6 JW |
3367 | |
3368 | tfile->sk.sk_write_space = tun_sock_write_space; | |
3369 | tfile->sk.sk_sndbuf = INT_MAX; | |
3370 | ||
631ab46b | 3371 | file->private_data = tfile; |
4008e97f | 3372 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 3373 | |
19a6afb2 JW |
3374 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
3375 | ||
1da177e4 LT |
3376 | return 0; |
3377 | } | |
3378 | ||
3379 | static int tun_chr_close(struct inode *inode, struct file *file) | |
3380 | { | |
631ab46b | 3381 | struct tun_file *tfile = file->private_data; |
1da177e4 | 3382 | |
c8d68e6b | 3383 | tun_detach(tfile, true); |
1da177e4 LT |
3384 | |
3385 | return 0; | |
3386 | } | |
3387 | ||
93e14b6d | 3388 | #ifdef CONFIG_PROC_FS |
9484dc74 | 3389 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *file) |
93e14b6d | 3390 | { |
9484dc74 | 3391 | struct tun_file *tfile = file->private_data; |
93e14b6d MY |
3392 | struct tun_struct *tun; |
3393 | struct ifreq ifr; | |
3394 | ||
3395 | memset(&ifr, 0, sizeof(ifr)); | |
3396 | ||
3397 | rtnl_lock(); | |
9484dc74 | 3398 | tun = tun_get(tfile); |
93e14b6d MY |
3399 | if (tun) |
3400 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
3401 | rtnl_unlock(); | |
3402 | ||
3403 | if (tun) | |
3404 | tun_put(tun); | |
3405 | ||
a3816ab0 | 3406 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
3407 | } |
3408 | #endif | |
3409 | ||
d54b1fdb | 3410 | static const struct file_operations tun_fops = { |
6aa20a22 | 3411 | .owner = THIS_MODULE, |
1da177e4 | 3412 | .llseek = no_llseek, |
9b067034 | 3413 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 3414 | .write_iter = tun_chr_write_iter, |
1da177e4 | 3415 | .poll = tun_chr_poll, |
50857e2a AB |
3416 | .unlocked_ioctl = tun_chr_ioctl, |
3417 | #ifdef CONFIG_COMPAT | |
3418 | .compat_ioctl = tun_chr_compat_ioctl, | |
3419 | #endif | |
1da177e4 LT |
3420 | .open = tun_chr_open, |
3421 | .release = tun_chr_close, | |
93e14b6d MY |
3422 | .fasync = tun_chr_fasync, |
3423 | #ifdef CONFIG_PROC_FS | |
3424 | .show_fdinfo = tun_chr_show_fdinfo, | |
3425 | #endif | |
1da177e4 LT |
3426 | }; |
3427 | ||
3428 | static struct miscdevice tun_miscdev = { | |
3429 | .minor = TUN_MINOR, | |
3430 | .name = "tun", | |
e454cea2 | 3431 | .nodename = "net/tun", |
1da177e4 | 3432 | .fops = &tun_fops, |
1da177e4 LT |
3433 | }; |
3434 | ||
3435 | /* ethtool interface */ | |
3436 | ||
4e24f2dd CW |
3437 | static void tun_default_link_ksettings(struct net_device *dev, |
3438 | struct ethtool_link_ksettings *cmd) | |
29ccc49d PR |
3439 | { |
3440 | ethtool_link_ksettings_zero_link_mode(cmd, supported); | |
3441 | ethtool_link_ksettings_zero_link_mode(cmd, advertising); | |
3442 | cmd->base.speed = SPEED_10; | |
3443 | cmd->base.duplex = DUPLEX_FULL; | |
3444 | cmd->base.port = PORT_TP; | |
3445 | cmd->base.phy_address = 0; | |
3446 | cmd->base.autoneg = AUTONEG_DISABLE; | |
4e24f2dd CW |
3447 | } |
3448 | ||
3449 | static int tun_get_link_ksettings(struct net_device *dev, | |
3450 | struct ethtool_link_ksettings *cmd) | |
3451 | { | |
3452 | struct tun_struct *tun = netdev_priv(dev); | |
3453 | ||
3454 | memcpy(cmd, &tun->link_ksettings, sizeof(*cmd)); | |
3455 | return 0; | |
3456 | } | |
3457 | ||
3458 | static int tun_set_link_ksettings(struct net_device *dev, | |
3459 | const struct ethtool_link_ksettings *cmd) | |
3460 | { | |
3461 | struct tun_struct *tun = netdev_priv(dev); | |
3462 | ||
3463 | memcpy(&tun->link_ksettings, cmd, sizeof(*cmd)); | |
1da177e4 LT |
3464 | return 0; |
3465 | } | |
3466 | ||
3467 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
3468 | { | |
3469 | struct tun_struct *tun = netdev_priv(dev); | |
3470 | ||
33a5ba14 RJ |
3471 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
3472 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
3473 | |
3474 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 3475 | case IFF_TUN: |
33a5ba14 | 3476 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 3477 | break; |
40630b82 | 3478 | case IFF_TAP: |
33a5ba14 | 3479 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
3480 | break; |
3481 | } | |
3482 | } | |
3483 | ||
3484 | static u32 tun_get_msglevel(struct net_device *dev) | |
3485 | { | |
3486 | #ifdef TUN_DEBUG | |
3487 | struct tun_struct *tun = netdev_priv(dev); | |
3488 | return tun->debug; | |
3489 | #else | |
3490 | return -EOPNOTSUPP; | |
3491 | #endif | |
3492 | } | |
3493 | ||
3494 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
3495 | { | |
3496 | #ifdef TUN_DEBUG | |
3497 | struct tun_struct *tun = netdev_priv(dev); | |
3498 | tun->debug = value; | |
3499 | #endif | |
3500 | } | |
3501 | ||
5503fcec JW |
3502 | static int tun_get_coalesce(struct net_device *dev, |
3503 | struct ethtool_coalesce *ec) | |
3504 | { | |
3505 | struct tun_struct *tun = netdev_priv(dev); | |
3506 | ||
3507 | ec->rx_max_coalesced_frames = tun->rx_batched; | |
3508 | ||
3509 | return 0; | |
3510 | } | |
3511 | ||
3512 | static int tun_set_coalesce(struct net_device *dev, | |
3513 | struct ethtool_coalesce *ec) | |
3514 | { | |
3515 | struct tun_struct *tun = netdev_priv(dev); | |
3516 | ||
3517 | if (ec->rx_max_coalesced_frames > NAPI_POLL_WEIGHT) | |
3518 | tun->rx_batched = NAPI_POLL_WEIGHT; | |
3519 | else | |
3520 | tun->rx_batched = ec->rx_max_coalesced_frames; | |
3521 | ||
3522 | return 0; | |
3523 | } | |
3524 | ||
7282d491 | 3525 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
3526 | .get_drvinfo = tun_get_drvinfo, |
3527 | .get_msglevel = tun_get_msglevel, | |
3528 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 3529 | .get_link = ethtool_op_get_link, |
eda29772 | 3530 | .get_ts_info = ethtool_op_get_ts_info, |
5503fcec JW |
3531 | .get_coalesce = tun_get_coalesce, |
3532 | .set_coalesce = tun_set_coalesce, | |
29ccc49d | 3533 | .get_link_ksettings = tun_get_link_ksettings, |
4e24f2dd | 3534 | .set_link_ksettings = tun_set_link_ksettings, |
1da177e4 LT |
3535 | }; |
3536 | ||
1576d986 JW |
3537 | static int tun_queue_resize(struct tun_struct *tun) |
3538 | { | |
3539 | struct net_device *dev = tun->dev; | |
3540 | struct tun_file *tfile; | |
5990a305 | 3541 | struct ptr_ring **rings; |
1576d986 JW |
3542 | int n = tun->numqueues + tun->numdisabled; |
3543 | int ret, i; | |
3544 | ||
5990a305 JW |
3545 | rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL); |
3546 | if (!rings) | |
1576d986 JW |
3547 | return -ENOMEM; |
3548 | ||
3549 | for (i = 0; i < tun->numqueues; i++) { | |
3550 | tfile = rtnl_dereference(tun->tfiles[i]); | |
5990a305 | 3551 | rings[i] = &tfile->tx_ring; |
1576d986 JW |
3552 | } |
3553 | list_for_each_entry(tfile, &tun->disabled, next) | |
5990a305 | 3554 | rings[i++] = &tfile->tx_ring; |
1576d986 | 3555 | |
5990a305 JW |
3556 | ret = ptr_ring_resize_multiple(rings, n, |
3557 | dev->tx_queue_len, GFP_KERNEL, | |
fc72d1d5 | 3558 | tun_ptr_free); |
1576d986 | 3559 | |
5990a305 | 3560 | kfree(rings); |
1576d986 JW |
3561 | return ret; |
3562 | } | |
3563 | ||
3564 | static int tun_device_event(struct notifier_block *unused, | |
3565 | unsigned long event, void *ptr) | |
3566 | { | |
3567 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3568 | struct tun_struct *tun = netdev_priv(dev); | |
3569 | ||
86dfb4ac CG |
3570 | if (dev->rtnl_link_ops != &tun_link_ops) |
3571 | return NOTIFY_DONE; | |
3572 | ||
1576d986 JW |
3573 | switch (event) { |
3574 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
3575 | if (tun_queue_resize(tun)) | |
3576 | return NOTIFY_BAD; | |
3577 | break; | |
3578 | default: | |
3579 | break; | |
3580 | } | |
3581 | ||
3582 | return NOTIFY_DONE; | |
3583 | } | |
3584 | ||
3585 | static struct notifier_block tun_notifier_block __read_mostly = { | |
3586 | .notifier_call = tun_device_event, | |
3587 | }; | |
79d17604 | 3588 | |
1da177e4 LT |
3589 | static int __init tun_init(void) |
3590 | { | |
3591 | int ret = 0; | |
3592 | ||
6b8a66ee | 3593 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1da177e4 | 3594 | |
f019a7a5 | 3595 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 3596 | if (ret) { |
6b8a66ee | 3597 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 3598 | goto err_linkops; |
79d17604 PE |
3599 | } |
3600 | ||
1da177e4 | 3601 | ret = misc_register(&tun_miscdev); |
79d17604 | 3602 | if (ret) { |
6b8a66ee | 3603 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
3604 | goto err_misc; |
3605 | } | |
1576d986 | 3606 | |
5edfbd3c TZ |
3607 | ret = register_netdevice_notifier(&tun_notifier_block); |
3608 | if (ret) { | |
3609 | pr_err("Can't register netdevice notifier\n"); | |
3610 | goto err_notifier; | |
3611 | } | |
3612 | ||
f019a7a5 | 3613 | return 0; |
5edfbd3c TZ |
3614 | |
3615 | err_notifier: | |
3616 | misc_deregister(&tun_miscdev); | |
79d17604 | 3617 | err_misc: |
f019a7a5 EB |
3618 | rtnl_link_unregister(&tun_link_ops); |
3619 | err_linkops: | |
1da177e4 LT |
3620 | return ret; |
3621 | } | |
3622 | ||
3623 | static void tun_cleanup(void) | |
3624 | { | |
6aa20a22 | 3625 | misc_deregister(&tun_miscdev); |
f019a7a5 | 3626 | rtnl_link_unregister(&tun_link_ops); |
1576d986 | 3627 | unregister_netdevice_notifier(&tun_notifier_block); |
1da177e4 LT |
3628 | } |
3629 | ||
05c2828c MT |
3630 | /* Get an underlying socket object from tun file. Returns error unless file is |
3631 | * attached to a device. The returned object works like a packet socket, it | |
3632 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
3633 | * holding a reference to the file for as long as the socket is in use. */ | |
3634 | struct socket *tun_get_socket(struct file *file) | |
3635 | { | |
6e914fc7 | 3636 | struct tun_file *tfile; |
05c2828c MT |
3637 | if (file->f_op != &tun_fops) |
3638 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
3639 | tfile = file->private_data; |
3640 | if (!tfile) | |
05c2828c | 3641 | return ERR_PTR(-EBADFD); |
54f968d6 | 3642 | return &tfile->socket; |
05c2828c MT |
3643 | } |
3644 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
3645 | ||
5990a305 | 3646 | struct ptr_ring *tun_get_tx_ring(struct file *file) |
83339c6b JW |
3647 | { |
3648 | struct tun_file *tfile; | |
3649 | ||
3650 | if (file->f_op != &tun_fops) | |
3651 | return ERR_PTR(-EINVAL); | |
3652 | tfile = file->private_data; | |
3653 | if (!tfile) | |
3654 | return ERR_PTR(-EBADFD); | |
5990a305 | 3655 | return &tfile->tx_ring; |
83339c6b | 3656 | } |
5990a305 | 3657 | EXPORT_SYMBOL_GPL(tun_get_tx_ring); |
83339c6b | 3658 | |
1da177e4 LT |
3659 | module_init(tun_init); |
3660 | module_exit(tun_cleanup); | |
3661 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
3662 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
3663 | MODULE_LICENSE("GPL"); | |
3664 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 3665 | MODULE_ALIAS("devname:net/tun"); |