Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * TUN - Universal TUN/TAP device driver. | |
4 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
5 | * | |
1da177e4 LT |
6 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ |
7 | */ | |
8 | ||
9 | /* | |
10 | * Changes: | |
11 | * | |
ff4cc3ac MK |
12 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
13 | * Add TUNSETLINK ioctl to set the link encapsulation | |
14 | * | |
1da177e4 | 15 | * Mark Smith <markzzzsmith@yahoo.com.au> |
344dc8ed | 16 | * Use eth_random_addr() for tap MAC address. |
1da177e4 LT |
17 | * |
18 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
19 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
20 | * Increased default tx queue length. | |
21 | * Added ethtool API. | |
22 | * Minor cleanups | |
23 | * | |
24 | * Daniel Podlejski <underley@underley.eu.org> | |
25 | * Modifications for 2.3.99-pre5 kernel. | |
26 | */ | |
27 | ||
6b8a66ee JP |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
1da177e4 LT |
30 | #define DRV_NAME "tun" |
31 | #define DRV_VERSION "1.6" | |
32 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
33 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
34 | ||
1da177e4 LT |
35 | #include <linux/module.h> |
36 | #include <linux/errno.h> | |
37 | #include <linux/kernel.h> | |
174cd4b1 | 38 | #include <linux/sched/signal.h> |
1da177e4 LT |
39 | #include <linux/major.h> |
40 | #include <linux/slab.h> | |
41 | #include <linux/poll.h> | |
42 | #include <linux/fcntl.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/skbuff.h> | |
45 | #include <linux/netdevice.h> | |
46 | #include <linux/etherdevice.h> | |
47 | #include <linux/miscdevice.h> | |
48 | #include <linux/ethtool.h> | |
49 | #include <linux/rtnetlink.h> | |
50857e2a | 50 | #include <linux/compat.h> |
1da177e4 LT |
51 | #include <linux/if.h> |
52 | #include <linux/if_arp.h> | |
53 | #include <linux/if_ether.h> | |
54 | #include <linux/if_tun.h> | |
6680ec68 | 55 | #include <linux/if_vlan.h> |
1da177e4 | 56 | #include <linux/crc32.h> |
d647a591 | 57 | #include <linux/nsproxy.h> |
f43798c2 | 58 | #include <linux/virtio_net.h> |
99405162 | 59 | #include <linux/rcupdate.h> |
881d966b | 60 | #include <net/net_namespace.h> |
79d17604 | 61 | #include <net/netns/generic.h> |
f019a7a5 | 62 | #include <net/rtnetlink.h> |
33dccbb0 | 63 | #include <net/sock.h> |
735fc405 | 64 | #include <net/xdp.h> |
93e14b6d | 65 | #include <linux/seq_file.h> |
e0b46d0e | 66 | #include <linux/uio.h> |
1576d986 | 67 | #include <linux/skb_array.h> |
761876c8 JW |
68 | #include <linux/bpf.h> |
69 | #include <linux/bpf_trace.h> | |
90e33d45 | 70 | #include <linux/mutex.h> |
1da177e4 | 71 | |
7c0f6ba6 | 72 | #include <linux/uaccess.h> |
f2780d6d | 73 | #include <linux/proc_fs.h> |
1da177e4 | 74 | |
4e24f2dd CW |
75 | static void tun_default_link_ksettings(struct net_device *dev, |
76 | struct ethtool_link_ksettings *cmd); | |
77 | ||
14daa021 RR |
78 | /* Uncomment to enable debugging */ |
79 | /* #define TUN_DEBUG 1 */ | |
80 | ||
1da177e4 LT |
81 | #ifdef TUN_DEBUG |
82 | static int debug; | |
14daa021 | 83 | |
6b8a66ee JP |
84 | #define tun_debug(level, tun, fmt, args...) \ |
85 | do { \ | |
86 | if (tun->debug) \ | |
87 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
88 | } while (0) | |
89 | #define DBG1(level, fmt, args...) \ | |
90 | do { \ | |
91 | if (debug == 2) \ | |
92 | printk(level fmt, ##args); \ | |
93 | } while (0) | |
14daa021 | 94 | #else |
6b8a66ee JP |
95 | #define tun_debug(level, tun, fmt, args...) \ |
96 | do { \ | |
97 | if (0) \ | |
98 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
99 | } while (0) | |
100 | #define DBG1(level, fmt, args...) \ | |
101 | do { \ | |
102 | if (0) \ | |
103 | printk(level fmt, ##args); \ | |
104 | } while (0) | |
14daa021 RR |
105 | #endif |
106 | ||
7df13219 | 107 | #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
66ccbc9c | 108 | |
031f5e03 MT |
109 | /* TUN device flags */ |
110 | ||
111 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
112 | * overload it to mean fasync when stored there. | |
113 | */ | |
114 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
115 | /* High bits in flags field are unused. */ |
116 | #define TUN_VNET_LE 0x80000000 | |
8b8e658b | 117 | #define TUN_VNET_BE 0x40000000 |
031f5e03 MT |
118 | |
119 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
90e33d45 PP |
120 | IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS) |
121 | ||
0690899b MT |
122 | #define GOODCOPY_LEN 128 |
123 | ||
f271b2cc MK |
124 | #define FLT_EXACT_COUNT 8 |
125 | struct tap_filter { | |
126 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
127 | u32 mask[2]; /* Mask of the hashed addrs */ | |
128 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
129 | }; | |
130 | ||
baf71c5c PG |
131 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
132 | * to max number of VCPUs in guest. */ | |
133 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 134 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 135 | |
96442e42 JW |
136 | #define TUN_FLOW_EXPIRE (3 * HZ) |
137 | ||
608b9977 PA |
138 | struct tun_pcpu_stats { |
139 | u64 rx_packets; | |
140 | u64 rx_bytes; | |
141 | u64 tx_packets; | |
142 | u64 tx_bytes; | |
143 | struct u64_stats_sync syncp; | |
144 | u32 rx_dropped; | |
145 | u32 tx_dropped; | |
146 | u32 rx_frame_errors; | |
147 | }; | |
148 | ||
54f968d6 | 149 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 150 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
151 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
152 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 153 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 154 | * this). |
6e914fc7 JW |
155 | * |
156 | * RCU usage: | |
36fe8c09 | 157 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 158 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 159 | */ |
631ab46b | 160 | struct tun_file { |
54f968d6 JW |
161 | struct sock sk; |
162 | struct socket socket; | |
6e914fc7 | 163 | struct tun_struct __rcu *tun; |
54f968d6 JW |
164 | struct fasync_struct *fasync; |
165 | /* only used for fasnyc */ | |
166 | unsigned int flags; | |
fb7589a1 PE |
167 | union { |
168 | u16 queue_index; | |
169 | unsigned int ifindex; | |
170 | }; | |
94317099 | 171 | struct napi_struct napi; |
aec72f33 | 172 | bool napi_enabled; |
af3fb24e | 173 | bool napi_frags_enabled; |
90e33d45 | 174 | struct mutex napi_mutex; /* Protects access to the above napi */ |
4008e97f JW |
175 | struct list_head next; |
176 | struct tun_struct *detached; | |
5990a305 | 177 | struct ptr_ring tx_ring; |
8bf5c4ee | 178 | struct xdp_rxq_info xdp_rxq; |
631ab46b EB |
179 | }; |
180 | ||
f9e06c45 JW |
181 | struct tun_page { |
182 | struct page *page; | |
183 | int count; | |
184 | }; | |
185 | ||
96442e42 JW |
186 | struct tun_flow_entry { |
187 | struct hlist_node hash_link; | |
188 | struct rcu_head rcu; | |
189 | struct tun_struct *tun; | |
190 | ||
191 | u32 rxhash; | |
9bc88939 | 192 | u32 rps_rxhash; |
96442e42 | 193 | int queue_index; |
83b1bc12 | 194 | unsigned long updated ____cacheline_aligned_in_smp; |
96442e42 JW |
195 | }; |
196 | ||
197 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
f13b5468 | 198 | #define TUN_MASK_FLOW_ENTRIES (TUN_NUM_FLOW_ENTRIES - 1) |
96442e42 | 199 | |
cd5681d7 | 200 | struct tun_prog { |
96f84061 JW |
201 | struct rcu_head rcu; |
202 | struct bpf_prog *prog; | |
203 | }; | |
204 | ||
54f968d6 | 205 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 206 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
207 | * file were attached to a persist device. |
208 | */ | |
14daa021 | 209 | struct tun_struct { |
c8d68e6b JW |
210 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
211 | unsigned int numqueues; | |
f271b2cc | 212 | unsigned int flags; |
0625c883 EB |
213 | kuid_t owner; |
214 | kgid_t group; | |
14daa021 | 215 | |
14daa021 | 216 | struct net_device *dev; |
c8f44aff | 217 | netdev_features_t set_features; |
88255375 | 218 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
d591a1f3 | 219 | NETIF_F_TSO6) |
d9d52b51 | 220 | |
eaea34b2 | 221 | int align; |
d9d52b51 | 222 | int vnet_hdr_sz; |
54f968d6 JW |
223 | int sndbuf; |
224 | struct tap_filter txflt; | |
225 | struct sock_fprog fprog; | |
226 | /* protected by rtnl lock */ | |
227 | bool filter_attached; | |
14daa021 RR |
228 | #ifdef TUN_DEBUG |
229 | int debug; | |
1da177e4 | 230 | #endif |
96442e42 | 231 | spinlock_t lock; |
96442e42 JW |
232 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
233 | struct timer_list flow_gc_timer; | |
234 | unsigned long ageing_time; | |
4008e97f JW |
235 | unsigned int numdisabled; |
236 | struct list_head disabled; | |
5dbbaf2d | 237 | void *security; |
b8732fb7 | 238 | u32 flow_count; |
5503fcec | 239 | u32 rx_batched; |
608b9977 | 240 | struct tun_pcpu_stats __percpu *pcpu_stats; |
761876c8 | 241 | struct bpf_prog __rcu *xdp_prog; |
cd5681d7 | 242 | struct tun_prog __rcu *steering_prog; |
aff3d70a | 243 | struct tun_prog __rcu *filter_prog; |
4e24f2dd | 244 | struct ethtool_link_ksettings link_ksettings; |
14daa021 | 245 | }; |
1da177e4 | 246 | |
aff3d70a JW |
247 | struct veth { |
248 | __be16 h_vlan_proto; | |
249 | __be16 h_vlan_TCI; | |
14daa021 | 250 | }; |
1da177e4 | 251 | |
1ffcbc85 | 252 | bool tun_is_xdp_frame(void *ptr) |
fc72d1d5 JW |
253 | { |
254 | return (unsigned long)ptr & TUN_XDP_FLAG; | |
255 | } | |
1ffcbc85 | 256 | EXPORT_SYMBOL(tun_is_xdp_frame); |
fc72d1d5 JW |
257 | |
258 | void *tun_xdp_to_ptr(void *ptr) | |
259 | { | |
260 | return (void *)((unsigned long)ptr | TUN_XDP_FLAG); | |
261 | } | |
262 | EXPORT_SYMBOL(tun_xdp_to_ptr); | |
263 | ||
264 | void *tun_ptr_to_xdp(void *ptr) | |
265 | { | |
266 | return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG); | |
267 | } | |
268 | EXPORT_SYMBOL(tun_ptr_to_xdp); | |
269 | ||
94317099 PP |
270 | static int tun_napi_receive(struct napi_struct *napi, int budget) |
271 | { | |
272 | struct tun_file *tfile = container_of(napi, struct tun_file, napi); | |
273 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
274 | struct sk_buff_head process_queue; | |
275 | struct sk_buff *skb; | |
276 | int received = 0; | |
277 | ||
278 | __skb_queue_head_init(&process_queue); | |
279 | ||
280 | spin_lock(&queue->lock); | |
281 | skb_queue_splice_tail_init(queue, &process_queue); | |
282 | spin_unlock(&queue->lock); | |
283 | ||
284 | while (received < budget && (skb = __skb_dequeue(&process_queue))) { | |
285 | napi_gro_receive(napi, skb); | |
286 | ++received; | |
287 | } | |
288 | ||
289 | if (!skb_queue_empty(&process_queue)) { | |
290 | spin_lock(&queue->lock); | |
291 | skb_queue_splice(&process_queue, queue); | |
292 | spin_unlock(&queue->lock); | |
293 | } | |
294 | ||
295 | return received; | |
296 | } | |
297 | ||
298 | static int tun_napi_poll(struct napi_struct *napi, int budget) | |
299 | { | |
300 | unsigned int received; | |
301 | ||
302 | received = tun_napi_receive(napi, budget); | |
303 | ||
304 | if (received < budget) | |
305 | napi_complete_done(napi, received); | |
306 | ||
307 | return received; | |
308 | } | |
309 | ||
310 | static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile, | |
af3fb24e | 311 | bool napi_en, bool napi_frags) |
94317099 | 312 | { |
aec72f33 | 313 | tfile->napi_enabled = napi_en; |
af3fb24e | 314 | tfile->napi_frags_enabled = napi_en && napi_frags; |
94317099 PP |
315 | if (napi_en) { |
316 | netif_napi_add(tun->dev, &tfile->napi, tun_napi_poll, | |
317 | NAPI_POLL_WEIGHT); | |
318 | napi_enable(&tfile->napi); | |
319 | } | |
320 | } | |
321 | ||
06e55add | 322 | static void tun_napi_disable(struct tun_file *tfile) |
94317099 | 323 | { |
aec72f33 | 324 | if (tfile->napi_enabled) |
94317099 PP |
325 | napi_disable(&tfile->napi); |
326 | } | |
327 | ||
06e55add | 328 | static void tun_napi_del(struct tun_file *tfile) |
94317099 | 329 | { |
aec72f33 | 330 | if (tfile->napi_enabled) |
94317099 PP |
331 | netif_napi_del(&tfile->napi); |
332 | } | |
333 | ||
af3fb24e | 334 | static bool tun_napi_frags_enabled(const struct tun_file *tfile) |
90e33d45 | 335 | { |
af3fb24e | 336 | return tfile->napi_frags_enabled; |
90e33d45 PP |
337 | } |
338 | ||
8b8e658b GK |
339 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
340 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
341 | { | |
342 | return tun->flags & TUN_VNET_BE ? false : | |
343 | virtio_legacy_is_little_endian(); | |
344 | } | |
345 | ||
346 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
347 | { | |
348 | int be = !!(tun->flags & TUN_VNET_BE); | |
349 | ||
350 | if (put_user(be, argp)) | |
351 | return -EFAULT; | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
357 | { | |
358 | int be; | |
359 | ||
360 | if (get_user(be, argp)) | |
361 | return -EFAULT; | |
362 | ||
363 | if (be) | |
364 | tun->flags |= TUN_VNET_BE; | |
365 | else | |
366 | tun->flags &= ~TUN_VNET_BE; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | #else | |
371 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
372 | { | |
373 | return virtio_legacy_is_little_endian(); | |
374 | } | |
375 | ||
376 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
377 | { | |
378 | return -EINVAL; | |
379 | } | |
380 | ||
381 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
382 | { | |
383 | return -EINVAL; | |
384 | } | |
385 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
386 | ||
25bd55bb GK |
387 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
388 | { | |
7d824109 | 389 | return tun->flags & TUN_VNET_LE || |
8b8e658b | 390 | tun_legacy_is_little_endian(tun); |
25bd55bb GK |
391 | } |
392 | ||
56f0dcc5 MT |
393 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
394 | { | |
25bd55bb | 395 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
396 | } |
397 | ||
398 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
399 | { | |
25bd55bb | 400 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
401 | } |
402 | ||
96442e42 JW |
403 | static inline u32 tun_hashfn(u32 rxhash) |
404 | { | |
f13b5468 | 405 | return rxhash & TUN_MASK_FLOW_ENTRIES; |
96442e42 JW |
406 | } |
407 | ||
408 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
409 | { | |
410 | struct tun_flow_entry *e; | |
96442e42 | 411 | |
b67bfe0d | 412 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
413 | if (e->rxhash == rxhash) |
414 | return e; | |
415 | } | |
416 | return NULL; | |
417 | } | |
418 | ||
419 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
420 | struct hlist_head *head, | |
421 | u32 rxhash, u16 queue_index) | |
422 | { | |
9fdc6bef ED |
423 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
424 | ||
96442e42 JW |
425 | if (e) { |
426 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
427 | rxhash, queue_index); | |
428 | e->updated = jiffies; | |
429 | e->rxhash = rxhash; | |
9bc88939 | 430 | e->rps_rxhash = 0; |
96442e42 JW |
431 | e->queue_index = queue_index; |
432 | e->tun = tun; | |
433 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 434 | ++tun->flow_count; |
96442e42 JW |
435 | } |
436 | return e; | |
437 | } | |
438 | ||
96442e42 JW |
439 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
440 | { | |
441 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
442 | e->rxhash, e->queue_index); | |
443 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 444 | kfree_rcu(e, rcu); |
b8732fb7 | 445 | --tun->flow_count; |
96442e42 JW |
446 | } |
447 | ||
448 | static void tun_flow_flush(struct tun_struct *tun) | |
449 | { | |
450 | int i; | |
451 | ||
452 | spin_lock_bh(&tun->lock); | |
453 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
454 | struct tun_flow_entry *e; | |
b67bfe0d | 455 | struct hlist_node *n; |
96442e42 | 456 | |
b67bfe0d | 457 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
458 | tun_flow_delete(tun, e); |
459 | } | |
460 | spin_unlock_bh(&tun->lock); | |
461 | } | |
462 | ||
463 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
464 | { | |
465 | int i; | |
466 | ||
467 | spin_lock_bh(&tun->lock); | |
468 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
469 | struct tun_flow_entry *e; | |
b67bfe0d | 470 | struct hlist_node *n; |
96442e42 | 471 | |
b67bfe0d | 472 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
473 | if (e->queue_index == queue_index) |
474 | tun_flow_delete(tun, e); | |
475 | } | |
476 | } | |
477 | spin_unlock_bh(&tun->lock); | |
478 | } | |
479 | ||
e99e88a9 | 480 | static void tun_flow_cleanup(struct timer_list *t) |
96442e42 | 481 | { |
e99e88a9 | 482 | struct tun_struct *tun = from_timer(tun, t, flow_gc_timer); |
96442e42 JW |
483 | unsigned long delay = tun->ageing_time; |
484 | unsigned long next_timer = jiffies + delay; | |
485 | unsigned long count = 0; | |
486 | int i; | |
487 | ||
488 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
489 | ||
7dbfb4ef | 490 | spin_lock(&tun->lock); |
96442e42 JW |
491 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
492 | struct tun_flow_entry *e; | |
b67bfe0d | 493 | struct hlist_node *n; |
96442e42 | 494 | |
b67bfe0d | 495 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 | 496 | unsigned long this_timer; |
81d98fa4 | 497 | |
96442e42 | 498 | this_timer = e->updated + delay; |
81d98fa4 | 499 | if (time_before_eq(this_timer, jiffies)) { |
96442e42 | 500 | tun_flow_delete(tun, e); |
81d98fa4 ED |
501 | continue; |
502 | } | |
503 | count++; | |
504 | if (time_before(this_timer, next_timer)) | |
96442e42 JW |
505 | next_timer = this_timer; |
506 | } | |
507 | } | |
508 | ||
509 | if (count) | |
510 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
7dbfb4ef | 511 | spin_unlock(&tun->lock); |
96442e42 JW |
512 | } |
513 | ||
49974420 | 514 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 515 | struct tun_file *tfile) |
96442e42 JW |
516 | { |
517 | struct hlist_head *head; | |
518 | struct tun_flow_entry *e; | |
519 | unsigned long delay = tun->ageing_time; | |
9e85722d | 520 | u16 queue_index = tfile->queue_index; |
96442e42 | 521 | |
5c327f67 | 522 | head = &tun->flows[tun_hashfn(rxhash)]; |
96442e42 JW |
523 | |
524 | rcu_read_lock(); | |
525 | ||
96442e42 JW |
526 | e = tun_flow_find(head, rxhash); |
527 | if (likely(e)) { | |
528 | /* TODO: keep queueing to old queue until it's empty? */ | |
83b1bc12 LR |
529 | if (e->queue_index != queue_index) |
530 | e->queue_index = queue_index; | |
531 | if (e->updated != jiffies) | |
532 | e->updated = jiffies; | |
9bc88939 | 533 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
534 | } else { |
535 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
536 | if (!tun_flow_find(head, rxhash) && |
537 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
538 | tun_flow_create(tun, head, rxhash, queue_index); |
539 | ||
540 | if (!timer_pending(&tun->flow_gc_timer)) | |
541 | mod_timer(&tun->flow_gc_timer, | |
542 | round_jiffies_up(jiffies + delay)); | |
543 | spin_unlock_bh(&tun->lock); | |
544 | } | |
545 | ||
96442e42 JW |
546 | rcu_read_unlock(); |
547 | } | |
548 | ||
9bc88939 TH |
549 | /** |
550 | * Save the hash received in the stack receive path and update the | |
551 | * flow_hash table accordingly. | |
552 | */ | |
553 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
554 | { | |
567e4b79 | 555 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 556 | e->rps_rxhash = hash; |
9bc88939 TH |
557 | } |
558 | ||
4b035271 | 559 | /* We try to identify a flow through its rxhash. The reason that |
92d4ea6e | 560 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
561 | * the rxq based on the txq where the last packet of the flow comes. As |
562 | * the userspace application move between processors, we may get a | |
4b035271 | 563 | * different rxq no. here. |
c8d68e6b | 564 | */ |
96f84061 | 565 | static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
c8d68e6b | 566 | { |
96442e42 | 567 | struct tun_flow_entry *e; |
c8d68e6b JW |
568 | u32 txq = 0; |
569 | u32 numqueues = 0; | |
570 | ||
6aa7de05 | 571 | numqueues = READ_ONCE(tun->numqueues); |
c8d68e6b | 572 | |
feec084a | 573 | txq = __skb_get_hash_symmetric(skb); |
4b035271 WL |
574 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
575 | if (e) { | |
576 | tun_flow_save_rps_rxhash(e, txq); | |
577 | txq = e->queue_index; | |
578 | } else { | |
579 | /* use multiply and shift instead of expensive divide */ | |
580 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
581 | } |
582 | ||
c8d68e6b JW |
583 | return txq; |
584 | } | |
585 | ||
96f84061 JW |
586 | static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb) |
587 | { | |
cd5681d7 | 588 | struct tun_prog *prog; |
a35d310f | 589 | u32 numqueues; |
96f84061 JW |
590 | u16 ret = 0; |
591 | ||
a35d310f JW |
592 | numqueues = READ_ONCE(tun->numqueues); |
593 | if (!numqueues) | |
594 | return 0; | |
595 | ||
96f84061 JW |
596 | prog = rcu_dereference(tun->steering_prog); |
597 | if (prog) | |
598 | ret = bpf_prog_run_clear_cb(prog->prog, skb); | |
599 | ||
a35d310f | 600 | return ret % numqueues; |
96f84061 JW |
601 | } |
602 | ||
603 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, | |
a350ecce | 604 | struct net_device *sb_dev) |
96f84061 JW |
605 | { |
606 | struct tun_struct *tun = netdev_priv(dev); | |
607 | u16 ret; | |
608 | ||
609 | rcu_read_lock(); | |
610 | if (rcu_dereference(tun->steering_prog)) | |
611 | ret = tun_ebpf_select_queue(tun, skb); | |
612 | else | |
613 | ret = tun_automq_select_queue(tun, skb); | |
614 | rcu_read_unlock(); | |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
cde8b15f JW |
619 | static inline bool tun_not_capable(struct tun_struct *tun) |
620 | { | |
621 | const struct cred *cred = current_cred(); | |
c260b772 | 622 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
623 | |
624 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
625 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 626 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
627 | } |
628 | ||
c8d68e6b JW |
629 | static void tun_set_real_num_queues(struct tun_struct *tun) |
630 | { | |
631 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
632 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
633 | } | |
634 | ||
4008e97f JW |
635 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
636 | { | |
637 | tfile->detached = tun; | |
638 | list_add_tail(&tfile->next, &tun->disabled); | |
639 | ++tun->numdisabled; | |
640 | } | |
641 | ||
d32649d1 | 642 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
643 | { |
644 | struct tun_struct *tun = tfile->detached; | |
645 | ||
646 | tfile->detached = NULL; | |
647 | list_del_init(&tfile->next); | |
648 | --tun->numdisabled; | |
649 | return tun; | |
650 | } | |
651 | ||
3a403076 | 652 | void tun_ptr_free(void *ptr) |
fc72d1d5 JW |
653 | { |
654 | if (!ptr) | |
655 | return; | |
1ffcbc85 JDB |
656 | if (tun_is_xdp_frame(ptr)) { |
657 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 658 | |
03993094 | 659 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
660 | } else { |
661 | __skb_array_destroy_skb(ptr); | |
662 | } | |
663 | } | |
3a403076 | 664 | EXPORT_SYMBOL_GPL(tun_ptr_free); |
fc72d1d5 | 665 | |
4bfb0513 JW |
666 | static void tun_queue_purge(struct tun_file *tfile) |
667 | { | |
fc72d1d5 | 668 | void *ptr; |
1576d986 | 669 | |
fc72d1d5 JW |
670 | while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL) |
671 | tun_ptr_free(ptr); | |
1576d986 | 672 | |
5503fcec | 673 | skb_queue_purge(&tfile->sk.sk_write_queue); |
4bfb0513 JW |
674 | skb_queue_purge(&tfile->sk.sk_error_queue); |
675 | } | |
676 | ||
c8d68e6b JW |
677 | static void __tun_detach(struct tun_file *tfile, bool clean) |
678 | { | |
679 | struct tun_file *ntfile; | |
680 | struct tun_struct *tun; | |
c8d68e6b | 681 | |
b8deabd3 JW |
682 | tun = rtnl_dereference(tfile->tun); |
683 | ||
94317099 | 684 | if (tun && clean) { |
06e55add ED |
685 | tun_napi_disable(tfile); |
686 | tun_napi_del(tfile); | |
94317099 PP |
687 | } |
688 | ||
9e85722d | 689 | if (tun && !tfile->detached) { |
c8d68e6b JW |
690 | u16 index = tfile->queue_index; |
691 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
692 | |
693 | rcu_assign_pointer(tun->tfiles[index], | |
694 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 695 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b | 696 | ntfile->queue_index = index; |
9871a9e4 JW |
697 | rcu_assign_pointer(tun->tfiles[tun->numqueues - 1], |
698 | NULL); | |
c8d68e6b JW |
699 | |
700 | --tun->numqueues; | |
9e85722d | 701 | if (clean) { |
c956674b | 702 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 703 | sock_put(&tfile->sk); |
9e85722d | 704 | } else |
4008e97f | 705 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
706 | |
707 | synchronize_net(); | |
96442e42 | 708 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 709 | /* Drop read queue */ |
4bfb0513 | 710 | tun_queue_purge(tfile); |
c8d68e6b | 711 | tun_set_real_num_queues(tun); |
dd38bd85 | 712 | } else if (tfile->detached && clean) { |
4008e97f | 713 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
714 | sock_put(&tfile->sk); |
715 | } | |
c8d68e6b JW |
716 | |
717 | if (clean) { | |
af668b3c MT |
718 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
719 | netif_carrier_off(tun->dev); | |
720 | ||
40630b82 | 721 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 722 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 723 | unregister_netdevice(tun->dev); |
af668b3c | 724 | } |
b196d88a JW |
725 | if (tun) |
726 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
7063efd3 | 727 | ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free); |
140e807d | 728 | sock_put(&tfile->sk); |
c8d68e6b JW |
729 | } |
730 | } | |
731 | ||
732 | static void tun_detach(struct tun_file *tfile, bool clean) | |
733 | { | |
83c1f36f SD |
734 | struct tun_struct *tun; |
735 | struct net_device *dev; | |
736 | ||
c8d68e6b | 737 | rtnl_lock(); |
83c1f36f SD |
738 | tun = rtnl_dereference(tfile->tun); |
739 | dev = tun ? tun->dev : NULL; | |
c8d68e6b | 740 | __tun_detach(tfile, clean); |
83c1f36f SD |
741 | if (dev) |
742 | netdev_state_change(dev); | |
c8d68e6b JW |
743 | rtnl_unlock(); |
744 | } | |
745 | ||
746 | static void tun_detach_all(struct net_device *dev) | |
747 | { | |
748 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 749 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
750 | int i, n = tun->numqueues; |
751 | ||
752 | for (i = 0; i < n; i++) { | |
b8deabd3 | 753 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 754 | BUG_ON(!tfile); |
06e55add | 755 | tun_napi_disable(tfile); |
addf8fc4 | 756 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 757 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 758 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
759 | --tun->numqueues; |
760 | } | |
9e85722d | 761 | list_for_each_entry(tfile, &tun->disabled, next) { |
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); |
9e85722d | 765 | } |
c8d68e6b JW |
766 | BUG_ON(tun->numqueues != 0); |
767 | ||
768 | synchronize_net(); | |
769 | for (i = 0; i < n; i++) { | |
b8deabd3 | 770 | tfile = rtnl_dereference(tun->tfiles[i]); |
06e55add | 771 | tun_napi_del(tfile); |
c8d68e6b | 772 | /* Drop read queue */ |
4bfb0513 | 773 | tun_queue_purge(tfile); |
b196d88a | 774 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
c8d68e6b JW |
775 | sock_put(&tfile->sk); |
776 | } | |
4008e97f JW |
777 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
778 | tun_enable_queue(tfile); | |
4bfb0513 | 779 | tun_queue_purge(tfile); |
b196d88a | 780 | xdp_rxq_info_unreg(&tfile->xdp_rxq); |
4008e97f JW |
781 | sock_put(&tfile->sk); |
782 | } | |
783 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 784 | |
40630b82 | 785 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 786 | module_put(THIS_MODULE); |
c8d68e6b JW |
787 | } |
788 | ||
94317099 | 789 | static int tun_attach(struct tun_struct *tun, struct file *file, |
af3fb24e | 790 | bool skip_filter, bool napi, bool napi_frags) |
a7385ba2 | 791 | { |
631ab46b | 792 | struct tun_file *tfile = file->private_data; |
1576d986 | 793 | struct net_device *dev = tun->dev; |
38231b7a | 794 | int err; |
a7385ba2 | 795 | |
5dbbaf2d PM |
796 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
797 | if (err < 0) | |
798 | goto out; | |
799 | ||
38231b7a | 800 | err = -EINVAL; |
9e85722d | 801 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
802 | goto out; |
803 | ||
804 | err = -EBUSY; | |
40630b82 | 805 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
806 | goto out; |
807 | ||
808 | err = -E2BIG; | |
4008e97f JW |
809 | if (!tfile->detached && |
810 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
811 | goto out; |
812 | ||
813 | err = 0; | |
54f968d6 | 814 | |
92d4ea6e | 815 | /* Re-attach the filter to persist device */ |
849c9b6f | 816 | if (!skip_filter && (tun->filter_attached == true)) { |
8ced425e HFS |
817 | lock_sock(tfile->socket.sk); |
818 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
819 | release_sock(tfile->socket.sk); | |
54f968d6 JW |
820 | if (!err) |
821 | goto out; | |
822 | } | |
1576d986 JW |
823 | |
824 | if (!tfile->detached && | |
b196d88a JW |
825 | ptr_ring_resize(&tfile->tx_ring, dev->tx_queue_len, |
826 | GFP_KERNEL, tun_ptr_free)) { | |
1576d986 JW |
827 | err = -ENOMEM; |
828 | goto out; | |
829 | } | |
830 | ||
c8d68e6b | 831 | tfile->queue_index = tun->numqueues; |
addf8fc4 | 832 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
8bf5c4ee JDB |
833 | |
834 | if (tfile->detached) { | |
835 | /* Re-attach detached tfile, updating XDP queue_index */ | |
836 | WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq)); | |
837 | ||
838 | if (tfile->xdp_rxq.queue_index != tfile->queue_index) | |
839 | tfile->xdp_rxq.queue_index = tfile->queue_index; | |
840 | } else { | |
841 | /* Setup XDP RX-queue info, for new tfile getting attached */ | |
842 | err = xdp_rxq_info_reg(&tfile->xdp_rxq, | |
843 | tun->dev, tfile->queue_index); | |
844 | if (err < 0) | |
845 | goto out; | |
8d5d8852 JDB |
846 | err = xdp_rxq_info_reg_mem_model(&tfile->xdp_rxq, |
847 | MEM_TYPE_PAGE_SHARED, NULL); | |
848 | if (err < 0) { | |
849 | xdp_rxq_info_unreg(&tfile->xdp_rxq); | |
850 | goto out; | |
851 | } | |
8bf5c4ee JDB |
852 | err = 0; |
853 | } | |
854 | ||
94317099 | 855 | if (tfile->detached) { |
4008e97f | 856 | tun_enable_queue(tfile); |
94317099 | 857 | } else { |
4008e97f | 858 | sock_hold(&tfile->sk); |
af3fb24e | 859 | tun_napi_init(tun, tfile, napi, napi_frags); |
94317099 | 860 | } |
4008e97f | 861 | |
e4a2a304 JW |
862 | if (rtnl_dereference(tun->xdp_prog)) |
863 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
864 | ||
c8d68e6b JW |
865 | /* device is allowed to go away first, so no need to hold extra |
866 | * refcnt. | |
867 | */ | |
868 | ||
0b7959b6 SF |
869 | /* Publish tfile->tun and tun->tfiles only after we've fully |
870 | * initialized tfile; otherwise we risk using half-initialized | |
871 | * object. | |
872 | */ | |
873 | rcu_assign_pointer(tfile->tun, tun); | |
874 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); | |
875 | tun->numqueues++; | |
3a03cb84 | 876 | tun_set_real_num_queues(tun); |
c8d68e6b JW |
877 | out: |
878 | return err; | |
631ab46b EB |
879 | } |
880 | ||
9484dc74 | 881 | static struct tun_struct *tun_get(struct tun_file *tfile) |
631ab46b | 882 | { |
6e914fc7 | 883 | struct tun_struct *tun; |
c70f1829 | 884 | |
6e914fc7 JW |
885 | rcu_read_lock(); |
886 | tun = rcu_dereference(tfile->tun); | |
887 | if (tun) | |
888 | dev_hold(tun->dev); | |
889 | rcu_read_unlock(); | |
c70f1829 EB |
890 | |
891 | return tun; | |
631ab46b EB |
892 | } |
893 | ||
631ab46b EB |
894 | static void tun_put(struct tun_struct *tun) |
895 | { | |
6e914fc7 | 896 | dev_put(tun->dev); |
631ab46b EB |
897 | } |
898 | ||
6b8a66ee | 899 | /* TAP filtering */ |
f271b2cc MK |
900 | static void addr_hash_set(u32 *mask, const u8 *addr) |
901 | { | |
902 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
903 | mask[n >> 5] |= (1 << (n & 31)); | |
904 | } | |
905 | ||
906 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
907 | { | |
908 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
909 | return mask[n >> 5] & (1 << (n & 31)); | |
910 | } | |
911 | ||
912 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
913 | { | |
914 | struct { u8 u[ETH_ALEN]; } *addr; | |
915 | struct tun_filter uf; | |
916 | int err, alen, n, nexact; | |
917 | ||
918 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
919 | return -EFAULT; | |
920 | ||
921 | if (!uf.count) { | |
922 | /* Disabled */ | |
923 | filter->count = 0; | |
924 | return 0; | |
925 | } | |
926 | ||
927 | alen = ETH_ALEN * uf.count; | |
28e8190d ME |
928 | addr = memdup_user(arg + sizeof(uf), alen); |
929 | if (IS_ERR(addr)) | |
930 | return PTR_ERR(addr); | |
f271b2cc MK |
931 | |
932 | /* The filter is updated without holding any locks. Which is | |
933 | * perfectly safe. We disable it first and in the worst | |
934 | * case we'll accept a few undesired packets. */ | |
935 | filter->count = 0; | |
936 | wmb(); | |
937 | ||
938 | /* Use first set of addresses as an exact filter */ | |
939 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
940 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
941 | ||
942 | nexact = n; | |
943 | ||
cfbf84fc AW |
944 | /* Remaining multicast addresses are hashed, |
945 | * unicast will leave the filter disabled. */ | |
f271b2cc | 946 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
947 | for (; n < uf.count; n++) { |
948 | if (!is_multicast_ether_addr(addr[n].u)) { | |
949 | err = 0; /* no filter */ | |
3b8d2a69 | 950 | goto free_addr; |
cfbf84fc | 951 | } |
f271b2cc | 952 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 953 | } |
f271b2cc MK |
954 | |
955 | /* For ALLMULTI just set the mask to all ones. | |
956 | * This overrides the mask populated above. */ | |
957 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
958 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
959 | ||
960 | /* Now enable the filter */ | |
961 | wmb(); | |
962 | filter->count = nexact; | |
963 | ||
964 | /* Return the number of exact filters */ | |
965 | err = nexact; | |
3b8d2a69 | 966 | free_addr: |
f271b2cc MK |
967 | kfree(addr); |
968 | return err; | |
969 | } | |
970 | ||
971 | /* Returns: 0 - drop, !=0 - accept */ | |
972 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
973 | { | |
974 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
975 | * at this point. */ | |
976 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
977 | int i; | |
978 | ||
979 | /* Exact match */ | |
980 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 981 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
982 | return 1; |
983 | ||
984 | /* Inexact match (multicast only) */ | |
985 | if (is_multicast_ether_addr(eh->h_dest)) | |
986 | return addr_hash_test(filter->mask, eh->h_dest); | |
987 | ||
988 | return 0; | |
989 | } | |
990 | ||
991 | /* | |
992 | * Checks whether the packet is accepted or not. | |
993 | * Returns: 0 - drop, !=0 - accept | |
994 | */ | |
995 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
996 | { | |
997 | if (!filter->count) | |
998 | return 1; | |
999 | ||
1000 | return run_filter(filter, skb); | |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | /* Network device part of the driver */ |
1004 | ||
7282d491 | 1005 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 1006 | |
c70f1829 EB |
1007 | /* Net device detach from fd. */ |
1008 | static void tun_net_uninit(struct net_device *dev) | |
1009 | { | |
c8d68e6b | 1010 | tun_detach_all(dev); |
c70f1829 EB |
1011 | } |
1012 | ||
1da177e4 LT |
1013 | /* Net device open. */ |
1014 | static int tun_net_open(struct net_device *dev) | |
1015 | { | |
c8d68e6b | 1016 | netif_tx_start_all_queues(dev); |
b20e2d54 | 1017 | |
1da177e4 LT |
1018 | return 0; |
1019 | } | |
1020 | ||
1021 | /* Net device close. */ | |
1022 | static int tun_net_close(struct net_device *dev) | |
1023 | { | |
c8d68e6b | 1024 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
1025 | return 0; |
1026 | } | |
1027 | ||
1028 | /* Net device start xmit */ | |
96f84061 | 1029 | static void tun_automq_xmit(struct tun_struct *tun, struct sk_buff *skb) |
1da177e4 | 1030 | { |
3df97ba8 | 1031 | #ifdef CONFIG_RPS |
dc05360f | 1032 | if (tun->numqueues == 1 && static_branch_unlikely(&rps_needed)) { |
9bc88939 TH |
1033 | /* Select queue was not called for the skbuff, so we extract the |
1034 | * RPS hash and save it into the flow_table here. | |
1035 | */ | |
4b035271 | 1036 | struct tun_flow_entry *e; |
9bc88939 TH |
1037 | __u32 rxhash; |
1038 | ||
feec084a | 1039 | rxhash = __skb_get_hash_symmetric(skb); |
4b035271 WL |
1040 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], rxhash); |
1041 | if (e) | |
1042 | tun_flow_save_rps_rxhash(e, rxhash); | |
9bc88939 | 1043 | } |
3df97ba8 | 1044 | #endif |
96f84061 JW |
1045 | } |
1046 | ||
aff3d70a JW |
1047 | static unsigned int run_ebpf_filter(struct tun_struct *tun, |
1048 | struct sk_buff *skb, | |
1049 | int len) | |
1050 | { | |
1051 | struct tun_prog *prog = rcu_dereference(tun->filter_prog); | |
1052 | ||
1053 | if (prog) | |
1054 | len = bpf_prog_run_clear_cb(prog->prog, skb); | |
1055 | ||
1056 | return len; | |
1057 | } | |
1058 | ||
96f84061 JW |
1059 | /* Net device start xmit */ |
1060 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
1061 | { | |
1062 | struct tun_struct *tun = netdev_priv(dev); | |
1063 | int txq = skb->queue_mapping; | |
1064 | struct tun_file *tfile; | |
aff3d70a | 1065 | int len = skb->len; |
96f84061 JW |
1066 | |
1067 | rcu_read_lock(); | |
1068 | tfile = rcu_dereference(tun->tfiles[txq]); | |
96f84061 JW |
1069 | |
1070 | /* Drop packet if interface is not attached */ | |
9871a9e4 | 1071 | if (!tfile) |
96f84061 JW |
1072 | goto drop; |
1073 | ||
1074 | if (!rcu_dereference(tun->steering_prog)) | |
1075 | tun_automq_xmit(tun, skb); | |
9bc88939 | 1076 | |
6e914fc7 JW |
1077 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
1078 | ||
c8d68e6b JW |
1079 | BUG_ON(!tfile); |
1080 | ||
f271b2cc MK |
1081 | /* Drop if the filter does not like it. |
1082 | * This is a noop if the filter is disabled. | |
1083 | * Filter can be enabled only for the TAP devices. */ | |
1084 | if (!check_filter(&tun->txflt, skb)) | |
1085 | goto drop; | |
1086 | ||
54f968d6 JW |
1087 | if (tfile->socket.sk->sk_filter && |
1088 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
1089 | goto drop; |
1090 | ||
aff3d70a | 1091 | len = run_ebpf_filter(tun, skb, len); |
81c89507 | 1092 | if (len == 0 || pskb_trim(skb, len)) |
aff3d70a JW |
1093 | goto drop; |
1094 | ||
1f8b977a | 1095 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
7bf66305 JW |
1096 | goto drop; |
1097 | ||
7b996243 | 1098 | skb_tx_timestamp(skb); |
eda29772 | 1099 | |
0110d6f2 | 1100 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
1101 | * for indefinite time. |
1102 | */ | |
0110d6f2 MT |
1103 | skb_orphan(skb); |
1104 | ||
f8af75f3 ED |
1105 | nf_reset(skb); |
1106 | ||
5990a305 | 1107 | if (ptr_ring_produce(&tfile->tx_ring, skb)) |
1576d986 | 1108 | goto drop; |
1da177e4 LT |
1109 | |
1110 | /* Notify and wake up reader process */ | |
54f968d6 JW |
1111 | if (tfile->flags & TUN_FASYNC) |
1112 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 1113 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
1114 | |
1115 | rcu_read_unlock(); | |
6ed10654 | 1116 | return NETDEV_TX_OK; |
1da177e4 LT |
1117 | |
1118 | drop: | |
608b9977 | 1119 | this_cpu_inc(tun->pcpu_stats->tx_dropped); |
149d36f7 | 1120 | skb_tx_error(skb); |
1da177e4 | 1121 | kfree_skb(skb); |
6e914fc7 | 1122 | rcu_read_unlock(); |
baeababb | 1123 | return NET_XMIT_DROP; |
1da177e4 LT |
1124 | } |
1125 | ||
f271b2cc | 1126 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 1127 | { |
f271b2cc MK |
1128 | /* |
1129 | * This callback is supposed to deal with mc filter in | |
1130 | * _rx_ path and has nothing to do with the _tx_ path. | |
1131 | * In rx path we always accept everything userspace gives us. | |
1132 | */ | |
1da177e4 LT |
1133 | } |
1134 | ||
c8f44aff MM |
1135 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
1136 | netdev_features_t features) | |
88255375 MM |
1137 | { |
1138 | struct tun_struct *tun = netdev_priv(dev); | |
1139 | ||
1140 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
1141 | } | |
eaea34b2 PA |
1142 | |
1143 | static void tun_set_headroom(struct net_device *dev, int new_hr) | |
1144 | { | |
1145 | struct tun_struct *tun = netdev_priv(dev); | |
1146 | ||
1147 | if (new_hr < NET_SKB_PAD) | |
1148 | new_hr = NET_SKB_PAD; | |
1149 | ||
1150 | tun->align = new_hr; | |
1151 | } | |
1152 | ||
bc1f4470 | 1153 | static void |
608b9977 PA |
1154 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
1155 | { | |
1156 | u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; | |
1157 | struct tun_struct *tun = netdev_priv(dev); | |
1158 | struct tun_pcpu_stats *p; | |
1159 | int i; | |
1160 | ||
1161 | for_each_possible_cpu(i) { | |
1162 | u64 rxpackets, rxbytes, txpackets, txbytes; | |
1163 | unsigned int start; | |
1164 | ||
1165 | p = per_cpu_ptr(tun->pcpu_stats, i); | |
1166 | do { | |
1167 | start = u64_stats_fetch_begin(&p->syncp); | |
1168 | rxpackets = p->rx_packets; | |
1169 | rxbytes = p->rx_bytes; | |
1170 | txpackets = p->tx_packets; | |
1171 | txbytes = p->tx_bytes; | |
1172 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
1173 | ||
1174 | stats->rx_packets += rxpackets; | |
1175 | stats->rx_bytes += rxbytes; | |
1176 | stats->tx_packets += txpackets; | |
1177 | stats->tx_bytes += txbytes; | |
1178 | ||
1179 | /* u32 counters */ | |
1180 | rx_dropped += p->rx_dropped; | |
1181 | rx_frame_errors += p->rx_frame_errors; | |
1182 | tx_dropped += p->tx_dropped; | |
1183 | } | |
1184 | stats->rx_dropped = rx_dropped; | |
1185 | stats->rx_frame_errors = rx_frame_errors; | |
1186 | stats->tx_dropped = tx_dropped; | |
608b9977 PA |
1187 | } |
1188 | ||
761876c8 JW |
1189 | static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1190 | struct netlink_ext_ack *extack) | |
1191 | { | |
1192 | struct tun_struct *tun = netdev_priv(dev); | |
e4a2a304 | 1193 | struct tun_file *tfile; |
761876c8 | 1194 | struct bpf_prog *old_prog; |
e4a2a304 | 1195 | int i; |
761876c8 JW |
1196 | |
1197 | old_prog = rtnl_dereference(tun->xdp_prog); | |
1198 | rcu_assign_pointer(tun->xdp_prog, prog); | |
1199 | if (old_prog) | |
1200 | bpf_prog_put(old_prog); | |
1201 | ||
e4a2a304 JW |
1202 | for (i = 0; i < tun->numqueues; i++) { |
1203 | tfile = rtnl_dereference(tun->tfiles[i]); | |
1204 | if (prog) | |
1205 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1206 | else | |
1207 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1208 | } | |
1209 | list_for_each_entry(tfile, &tun->disabled, next) { | |
1210 | if (prog) | |
1211 | sock_set_flag(&tfile->sk, SOCK_XDP); | |
1212 | else | |
1213 | sock_reset_flag(&tfile->sk, SOCK_XDP); | |
1214 | } | |
1215 | ||
761876c8 JW |
1216 | return 0; |
1217 | } | |
1218 | ||
1219 | static u32 tun_xdp_query(struct net_device *dev) | |
1220 | { | |
1221 | struct tun_struct *tun = netdev_priv(dev); | |
1222 | const struct bpf_prog *xdp_prog; | |
1223 | ||
1224 | xdp_prog = rtnl_dereference(tun->xdp_prog); | |
1225 | if (xdp_prog) | |
1226 | return xdp_prog->aux->id; | |
1227 | ||
1228 | return 0; | |
1229 | } | |
1230 | ||
f4e63525 | 1231 | static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
761876c8 JW |
1232 | { |
1233 | switch (xdp->command) { | |
1234 | case XDP_SETUP_PROG: | |
1235 | return tun_xdp_set(dev, xdp->prog, xdp->extack); | |
1236 | case XDP_QUERY_PROG: | |
1237 | xdp->prog_id = tun_xdp_query(dev); | |
761876c8 JW |
1238 | return 0; |
1239 | default: | |
1240 | return -EINVAL; | |
1241 | } | |
1242 | } | |
1243 | ||
26d31925 ND |
1244 | static int tun_net_change_carrier(struct net_device *dev, bool new_carrier) |
1245 | { | |
1246 | if (new_carrier) { | |
1247 | struct tun_struct *tun = netdev_priv(dev); | |
1248 | ||
1249 | if (!tun->numqueues) | |
1250 | return -EPERM; | |
1251 | ||
1252 | netif_carrier_on(dev); | |
1253 | } else { | |
1254 | netif_carrier_off(dev); | |
1255 | } | |
1256 | return 0; | |
1257 | } | |
1258 | ||
758e43b7 | 1259 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 1260 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1261 | .ndo_open = tun_net_open, |
1262 | .ndo_stop = tun_net_close, | |
00829823 | 1263 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1264 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 1265 | .ndo_select_queue = tun_select_queue, |
eaea34b2 | 1266 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1267 | .ndo_get_stats64 = tun_net_get_stats64, |
26d31925 | 1268 | .ndo_change_carrier = tun_net_change_carrier, |
758e43b7 SH |
1269 | }; |
1270 | ||
0c9d917b JDB |
1271 | static void __tun_xdp_flush_tfile(struct tun_file *tfile) |
1272 | { | |
1273 | /* Notify and wake up reader process */ | |
1274 | if (tfile->flags & TUN_FASYNC) | |
1275 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
1276 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); | |
1277 | } | |
1278 | ||
42b33468 JDB |
1279 | static int tun_xdp_xmit(struct net_device *dev, int n, |
1280 | struct xdp_frame **frames, u32 flags) | |
fc72d1d5 JW |
1281 | { |
1282 | struct tun_struct *tun = netdev_priv(dev); | |
fc72d1d5 JW |
1283 | struct tun_file *tfile; |
1284 | u32 numqueues; | |
735fc405 JDB |
1285 | int drops = 0; |
1286 | int cnt = n; | |
1287 | int i; | |
fc72d1d5 | 1288 | |
0c9d917b | 1289 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
42b33468 JDB |
1290 | return -EINVAL; |
1291 | ||
fc72d1d5 JW |
1292 | rcu_read_lock(); |
1293 | ||
9871a9e4 | 1294 | resample: |
fc72d1d5 JW |
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]); | |
9871a9e4 JW |
1303 | if (unlikely(!tfile)) |
1304 | goto resample; | |
735fc405 JDB |
1305 | |
1306 | spin_lock(&tfile->tx_ring.producer_lock); | |
1307 | for (i = 0; i < n; i++) { | |
1308 | struct xdp_frame *xdp = frames[i]; | |
1309 | /* Encode the XDP flag into lowest bit for consumer to differ | |
1310 | * XDP buffer from sk_buff. | |
1311 | */ | |
1312 | void *frame = tun_xdp_to_ptr(xdp); | |
1313 | ||
1314 | if (__ptr_ring_produce(&tfile->tx_ring, frame)) { | |
1315 | this_cpu_inc(tun->pcpu_stats->tx_dropped); | |
1316 | xdp_return_frame_rx_napi(xdp); | |
1317 | drops++; | |
1318 | } | |
fc72d1d5 | 1319 | } |
735fc405 | 1320 | spin_unlock(&tfile->tx_ring.producer_lock); |
fc72d1d5 | 1321 | |
0c9d917b JDB |
1322 | if (flags & XDP_XMIT_FLUSH) |
1323 | __tun_xdp_flush_tfile(tfile); | |
1324 | ||
fc72d1d5 | 1325 | rcu_read_unlock(); |
735fc405 | 1326 | return cnt - drops; |
fc72d1d5 JW |
1327 | } |
1328 | ||
44fa2dbd JDB |
1329 | static int tun_xdp_tx(struct net_device *dev, struct xdp_buff *xdp) |
1330 | { | |
1331 | struct xdp_frame *frame = convert_to_xdp_frame(xdp); | |
1332 | ||
1333 | if (unlikely(!frame)) | |
1334 | return -EOVERFLOW; | |
1335 | ||
42421a56 | 1336 | return tun_xdp_xmit(dev, 1, &frame, XDP_XMIT_FLUSH); |
fc72d1d5 JW |
1337 | } |
1338 | ||
758e43b7 | 1339 | static const struct net_device_ops tap_netdev_ops = { |
c70f1829 | 1340 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1341 | .ndo_open = tun_net_open, |
1342 | .ndo_stop = tun_net_close, | |
00829823 | 1343 | .ndo_start_xmit = tun_net_xmit, |
88255375 | 1344 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 1345 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
1346 | .ndo_set_mac_address = eth_mac_addr, |
1347 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 1348 | .ndo_select_queue = tun_select_queue, |
5e52796a | 1349 | .ndo_features_check = passthru_features_check, |
eaea34b2 | 1350 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1351 | .ndo_get_stats64 = tun_net_get_stats64, |
f4e63525 | 1352 | .ndo_bpf = tun_xdp, |
fc72d1d5 | 1353 | .ndo_xdp_xmit = tun_xdp_xmit, |
26d31925 | 1354 | .ndo_change_carrier = tun_net_change_carrier, |
758e43b7 SH |
1355 | }; |
1356 | ||
944a1376 | 1357 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
1358 | { |
1359 | int i; | |
1360 | ||
96442e42 JW |
1361 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
1362 | INIT_HLIST_HEAD(&tun->flows[i]); | |
1363 | ||
1364 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
e99e88a9 KC |
1365 | timer_setup(&tun->flow_gc_timer, tun_flow_cleanup, 0); |
1366 | mod_timer(&tun->flow_gc_timer, | |
1367 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
1368 | } |
1369 | ||
1370 | static void tun_flow_uninit(struct tun_struct *tun) | |
1371 | { | |
1372 | del_timer_sync(&tun->flow_gc_timer); | |
1373 | tun_flow_flush(tun); | |
96442e42 JW |
1374 | } |
1375 | ||
91572088 JW |
1376 | #define MIN_MTU 68 |
1377 | #define MAX_MTU 65535 | |
1378 | ||
1da177e4 LT |
1379 | /* Initialize net device. */ |
1380 | static void tun_net_init(struct net_device *dev) | |
1381 | { | |
1382 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 1383 | |
1da177e4 | 1384 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 1385 | case IFF_TUN: |
758e43b7 SH |
1386 | dev->netdev_ops = &tun_netdev_ops; |
1387 | ||
1da177e4 LT |
1388 | /* Point-to-Point TUN Device */ |
1389 | dev->hard_header_len = 0; | |
1390 | dev->addr_len = 0; | |
1391 | dev->mtu = 1500; | |
1392 | ||
1393 | /* Zero header length */ | |
6aa20a22 | 1394 | dev->type = ARPHRD_NONE; |
1da177e4 | 1395 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
1da177e4 LT |
1396 | break; |
1397 | ||
40630b82 | 1398 | case IFF_TAP: |
7a0a9608 | 1399 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 1400 | /* Ethernet TAP Device */ |
1da177e4 | 1401 | ether_setup(dev); |
550fd08c | 1402 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 1403 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 1404 | |
f2cedb63 | 1405 | eth_hw_addr_random(dev); |
36226a8d | 1406 | |
1da177e4 LT |
1407 | break; |
1408 | } | |
91572088 JW |
1409 | |
1410 | dev->min_mtu = MIN_MTU; | |
1411 | dev->max_mtu = MAX_MTU - dev->hard_header_len; | |
1da177e4 LT |
1412 | } |
1413 | ||
2f3ab622 JW |
1414 | static bool tun_sock_writeable(struct tun_struct *tun, struct tun_file *tfile) |
1415 | { | |
1416 | struct sock *sk = tfile->socket.sk; | |
1417 | ||
1418 | return (tun->dev->flags & IFF_UP) && sock_writeable(sk); | |
1419 | } | |
1420 | ||
1da177e4 LT |
1421 | /* Character device part */ |
1422 | ||
1423 | /* Poll */ | |
afc9a42b | 1424 | static __poll_t tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 1425 | { |
b2430de3 | 1426 | struct tun_file *tfile = file->private_data; |
9484dc74 | 1427 | struct tun_struct *tun = tun_get(tfile); |
3c8a9c63 | 1428 | struct sock *sk; |
afc9a42b | 1429 | __poll_t mask = 0; |
1da177e4 LT |
1430 | |
1431 | if (!tun) | |
a9a08845 | 1432 | return EPOLLERR; |
1da177e4 | 1433 | |
54f968d6 | 1434 | sk = tfile->socket.sk; |
3c8a9c63 | 1435 | |
6b8a66ee | 1436 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 1437 | |
9e641bdc | 1438 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 1439 | |
5990a305 | 1440 | if (!ptr_ring_empty(&tfile->tx_ring)) |
a9a08845 | 1441 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 | 1442 | |
2f3ab622 JW |
1443 | /* Make sure SOCKWQ_ASYNC_NOSPACE is set if not writable to |
1444 | * guarantee EPOLLOUT to be raised by either here or | |
1445 | * tun_sock_write_space(). Then process could get notification | |
1446 | * after it writes to a down device and meets -EIO. | |
1447 | */ | |
1448 | if (tun_sock_writeable(tun, tfile) || | |
1449 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
1450 | tun_sock_writeable(tun, tfile))) | |
a9a08845 | 1451 | mask |= EPOLLOUT | EPOLLWRNORM; |
33dccbb0 | 1452 | |
c70f1829 | 1453 | if (tun->dev->reg_state != NETREG_REGISTERED) |
a9a08845 | 1454 | mask = EPOLLERR; |
c70f1829 | 1455 | |
631ab46b | 1456 | tun_put(tun); |
1da177e4 LT |
1457 | return mask; |
1458 | } | |
1459 | ||
90e33d45 PP |
1460 | static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile, |
1461 | size_t len, | |
1462 | const struct iov_iter *it) | |
1463 | { | |
1464 | struct sk_buff *skb; | |
1465 | size_t linear; | |
1466 | int err; | |
1467 | int i; | |
1468 | ||
1469 | if (it->nr_segs > MAX_SKB_FRAGS + 1) | |
1470 | return ERR_PTR(-ENOMEM); | |
1471 | ||
1472 | local_bh_disable(); | |
1473 | skb = napi_get_frags(&tfile->napi); | |
1474 | local_bh_enable(); | |
1475 | if (!skb) | |
1476 | return ERR_PTR(-ENOMEM); | |
1477 | ||
1478 | linear = iov_iter_single_seg_count(it); | |
1479 | err = __skb_grow(skb, linear); | |
1480 | if (err) | |
1481 | goto free; | |
1482 | ||
1483 | skb->len = len; | |
1484 | skb->data_len = len - linear; | |
1485 | skb->truesize += skb->data_len; | |
1486 | ||
1487 | for (i = 1; i < it->nr_segs; i++) { | |
1488 | size_t fragsz = it->iov[i].iov_len; | |
aa6daaca ED |
1489 | struct page *page; |
1490 | void *frag; | |
90e33d45 PP |
1491 | |
1492 | if (fragsz == 0 || fragsz > PAGE_SIZE) { | |
1493 | err = -EINVAL; | |
1494 | goto free; | |
1495 | } | |
aa6daaca ED |
1496 | frag = netdev_alloc_frag(fragsz); |
1497 | if (!frag) { | |
90e33d45 PP |
1498 | err = -ENOMEM; |
1499 | goto free; | |
1500 | } | |
aa6daaca ED |
1501 | page = virt_to_head_page(frag); |
1502 | skb_fill_page_desc(skb, i - 1, page, | |
1503 | frag - page_address(page), fragsz); | |
90e33d45 PP |
1504 | } |
1505 | ||
1506 | return skb; | |
1507 | free: | |
1508 | /* frees skb and all frags allocated with napi_alloc_frag() */ | |
1509 | napi_free_frags(&tfile->napi); | |
1510 | return ERR_PTR(err); | |
1511 | } | |
1512 | ||
f42157cb RR |
1513 | /* prepad is the amount to reserve at front. len is length after that. |
1514 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1515 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1516 | size_t prepad, size_t len, |
1517 | size_t linear, int noblock) | |
f42157cb | 1518 | { |
54f968d6 | 1519 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1520 | struct sk_buff *skb; |
33dccbb0 | 1521 | int err; |
f42157cb RR |
1522 | |
1523 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1524 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1525 | linear = len; |
f42157cb | 1526 | |
33dccbb0 | 1527 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1528 | &err, 0); |
f42157cb | 1529 | if (!skb) |
33dccbb0 | 1530 | return ERR_PTR(err); |
f42157cb RR |
1531 | |
1532 | skb_reserve(skb, prepad); | |
1533 | skb_put(skb, linear); | |
33dccbb0 HX |
1534 | skb->data_len = len - linear; |
1535 | skb->len += len - linear; | |
f42157cb RR |
1536 | |
1537 | return skb; | |
1538 | } | |
1539 | ||
5503fcec JW |
1540 | static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile, |
1541 | struct sk_buff *skb, int more) | |
1542 | { | |
1543 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; | |
1544 | struct sk_buff_head process_queue; | |
1545 | u32 rx_batched = tun->rx_batched; | |
1546 | bool rcv = false; | |
1547 | ||
1548 | if (!rx_batched || (!more && skb_queue_empty(queue))) { | |
1549 | local_bh_disable(); | |
8ebebcba | 1550 | skb_record_rx_queue(skb, tfile->queue_index); |
5503fcec JW |
1551 | netif_receive_skb(skb); |
1552 | local_bh_enable(); | |
1553 | return; | |
1554 | } | |
1555 | ||
1556 | spin_lock(&queue->lock); | |
1557 | if (!more || skb_queue_len(queue) == rx_batched) { | |
1558 | __skb_queue_head_init(&process_queue); | |
1559 | skb_queue_splice_tail_init(queue, &process_queue); | |
1560 | rcv = true; | |
1561 | } else { | |
1562 | __skb_queue_tail(queue, skb); | |
1563 | } | |
1564 | spin_unlock(&queue->lock); | |
1565 | ||
1566 | if (rcv) { | |
1567 | struct sk_buff *nskb; | |
1568 | ||
1569 | local_bh_disable(); | |
8ebebcba MC |
1570 | while ((nskb = __skb_dequeue(&process_queue))) { |
1571 | skb_record_rx_queue(nskb, tfile->queue_index); | |
5503fcec | 1572 | netif_receive_skb(nskb); |
8ebebcba MC |
1573 | } |
1574 | skb_record_rx_queue(skb, tfile->queue_index); | |
5503fcec JW |
1575 | netif_receive_skb(skb); |
1576 | local_bh_enable(); | |
1577 | } | |
1578 | } | |
1579 | ||
66ccbc9c JW |
1580 | static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile, |
1581 | int len, int noblock, bool zerocopy) | |
1582 | { | |
1583 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) | |
1584 | return false; | |
1585 | ||
1586 | if (tfile->socket.sk->sk_sndbuf != INT_MAX) | |
1587 | return false; | |
1588 | ||
1589 | if (!noblock) | |
1590 | return false; | |
1591 | ||
1592 | if (zerocopy) | |
1593 | return false; | |
1594 | ||
1595 | if (SKB_DATA_ALIGN(len + TUN_RX_PAD) + | |
1596 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
1597 | return false; | |
1598 | ||
1599 | return true; | |
1600 | } | |
1601 | ||
ac1f1f6c | 1602 | static struct sk_buff *__tun_build_skb(struct page_frag *alloc_frag, char *buf, |
8ae1aff0 | 1603 | int buflen, int len, int pad) |
ac1f1f6c JW |
1604 | { |
1605 | struct sk_buff *skb = build_skb(buf, buflen); | |
1606 | ||
1607 | if (!skb) | |
1608 | return ERR_PTR(-ENOMEM); | |
1609 | ||
8ae1aff0 | 1610 | skb_reserve(skb, pad); |
ac1f1f6c JW |
1611 | skb_put(skb, len); |
1612 | ||
1613 | get_page(alloc_frag->page); | |
1614 | alloc_frag->offset += buflen; | |
1615 | ||
1616 | return skb; | |
1617 | } | |
1618 | ||
8ae1aff0 JW |
1619 | static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog, |
1620 | struct xdp_buff *xdp, u32 act) | |
1621 | { | |
1622 | int err; | |
1623 | ||
1624 | switch (act) { | |
1625 | case XDP_REDIRECT: | |
1626 | err = xdp_do_redirect(tun->dev, xdp, xdp_prog); | |
8ae1aff0 JW |
1627 | if (err) |
1628 | return err; | |
1629 | break; | |
1630 | case XDP_TX: | |
1631 | err = tun_xdp_tx(tun->dev, xdp); | |
1632 | if (err < 0) | |
1633 | return err; | |
1634 | break; | |
1635 | case XDP_PASS: | |
1636 | break; | |
1637 | default: | |
1638 | bpf_warn_invalid_xdp_action(act); | |
1639 | /* fall through */ | |
1640 | case XDP_ABORTED: | |
1641 | trace_xdp_exception(tun->dev, xdp_prog, act); | |
1642 | /* fall through */ | |
1643 | case XDP_DROP: | |
1644 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
1645 | break; | |
1646 | } | |
1647 | ||
1648 | return act; | |
1649 | } | |
1650 | ||
761876c8 JW |
1651 | static struct sk_buff *tun_build_skb(struct tun_struct *tun, |
1652 | struct tun_file *tfile, | |
66ccbc9c | 1653 | struct iov_iter *from, |
761876c8 | 1654 | struct virtio_net_hdr *hdr, |
1cfe6e93 | 1655 | int len, int *skb_xdp) |
66ccbc9c | 1656 | { |
0bbd7dad | 1657 | struct page_frag *alloc_frag = ¤t->task_frag; |
761876c8 | 1658 | struct bpf_prog *xdp_prog; |
7df13219 | 1659 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
66ccbc9c JW |
1660 | char *buf; |
1661 | size_t copied; | |
8ae1aff0 JW |
1662 | int pad = TUN_RX_PAD; |
1663 | int err = 0; | |
7df13219 JW |
1664 | |
1665 | rcu_read_lock(); | |
1666 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1667 | if (xdp_prog) | |
4f23aff8 | 1668 | pad += XDP_PACKET_HEADROOM; |
7df13219 JW |
1669 | buflen += SKB_DATA_ALIGN(len + pad); |
1670 | rcu_read_unlock(); | |
66ccbc9c | 1671 | |
63b9ab65 | 1672 | alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); |
66ccbc9c JW |
1673 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) |
1674 | return ERR_PTR(-ENOMEM); | |
1675 | ||
1676 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
1677 | copied = copy_page_from_iter(alloc_frag->page, | |
7df13219 | 1678 | alloc_frag->offset + pad, |
66ccbc9c JW |
1679 | len, from); |
1680 | if (copied != len) | |
1681 | return ERR_PTR(-EFAULT); | |
1682 | ||
7df13219 JW |
1683 | /* There's a small window that XDP may be set after the check |
1684 | * of xdp_prog above, this should be rare and for simplicity | |
1685 | * we do XDP on skb in case the headroom is not enough. | |
1686 | */ | |
ac1f1f6c | 1687 | if (hdr->gso_type || !xdp_prog) { |
1cfe6e93 | 1688 | *skb_xdp = 1; |
8ae1aff0 | 1689 | return __tun_build_skb(alloc_frag, buf, buflen, len, pad); |
ac1f1f6c JW |
1690 | } |
1691 | ||
1692 | *skb_xdp = 0; | |
761876c8 | 1693 | |
6547e387 | 1694 | local_bh_disable(); |
761876c8 JW |
1695 | rcu_read_lock(); |
1696 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
8ae1aff0 | 1697 | if (xdp_prog) { |
761876c8 | 1698 | struct xdp_buff xdp; |
761876c8 JW |
1699 | u32 act; |
1700 | ||
1701 | xdp.data_hard_start = buf; | |
7df13219 | 1702 | xdp.data = buf + pad; |
de8f3a83 | 1703 | xdp_set_data_meta_invalid(&xdp); |
761876c8 | 1704 | xdp.data_end = xdp.data + len; |
8bf5c4ee | 1705 | xdp.rxq = &tfile->xdp_rxq; |
761876c8 | 1706 | |
8ae1aff0 JW |
1707 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
1708 | if (act == XDP_REDIRECT || act == XDP_TX) { | |
59655a5b JW |
1709 | get_page(alloc_frag->page); |
1710 | alloc_frag->offset += buflen; | |
761876c8 | 1711 | } |
8ae1aff0 JW |
1712 | err = tun_xdp_act(tun, xdp_prog, &xdp, act); |
1713 | if (err < 0) | |
1714 | goto err_xdp; | |
1a097910 JW |
1715 | if (err == XDP_REDIRECT) |
1716 | xdp_do_flush_map(); | |
8ae1aff0 JW |
1717 | if (err != XDP_PASS) |
1718 | goto out; | |
1719 | ||
1720 | pad = xdp.data - xdp.data_hard_start; | |
1721 | len = xdp.data_end - xdp.data; | |
761876c8 | 1722 | } |
291aeb2b JW |
1723 | rcu_read_unlock(); |
1724 | local_bh_enable(); | |
761876c8 | 1725 | |
8ae1aff0 | 1726 | return __tun_build_skb(alloc_frag, buf, buflen, len, pad); |
761876c8 | 1727 | |
8ae1aff0 | 1728 | err_xdp: |
761876c8 | 1729 | put_page(alloc_frag->page); |
f7053b6c | 1730 | out: |
761876c8 | 1731 | rcu_read_unlock(); |
6547e387 | 1732 | local_bh_enable(); |
761876c8 | 1733 | return NULL; |
66ccbc9c JW |
1734 | } |
1735 | ||
1da177e4 | 1736 | /* Get packet from user space buffer */ |
54f968d6 | 1737 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 | 1738 | void *msg_control, struct iov_iter *from, |
5503fcec | 1739 | int noblock, bool more) |
1da177e4 | 1740 | { |
09640e63 | 1741 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1742 | struct sk_buff *skb; |
f5ff53b4 | 1743 | size_t total_len = iov_iter_count(from); |
eaea34b2 | 1744 | size_t len = total_len, align = tun->align, linear; |
f43798c2 | 1745 | struct virtio_net_hdr gso = { 0 }; |
608b9977 | 1746 | struct tun_pcpu_stats *stats; |
96f8d9ec | 1747 | int good_linear; |
0690899b MT |
1748 | int copylen; |
1749 | bool zerocopy = false; | |
1750 | int err; | |
96f84061 | 1751 | u32 rxhash = 0; |
1cfe6e93 | 1752 | int skb_xdp = 1; |
af3fb24e | 1753 | bool frags = tun_napi_frags_enabled(tfile); |
1da177e4 | 1754 | |
40630b82 | 1755 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1756 | if (len < sizeof(pi)) |
1da177e4 | 1757 | return -EINVAL; |
15718ea0 | 1758 | len -= sizeof(pi); |
1da177e4 | 1759 | |
cbbd26b8 | 1760 | if (!copy_from_iter_full(&pi, sizeof(pi), from)) |
1da177e4 LT |
1761 | return -EFAULT; |
1762 | } | |
1763 | ||
40630b82 | 1764 | if (tun->flags & IFF_VNET_HDR) { |
e1edab87 WB |
1765 | int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1766 | ||
1767 | if (len < vnet_hdr_sz) | |
f43798c2 | 1768 | return -EINVAL; |
e1edab87 | 1769 | len -= vnet_hdr_sz; |
f43798c2 | 1770 | |
cbbd26b8 | 1771 | if (!copy_from_iter_full(&gso, sizeof(gso), from)) |
f43798c2 RR |
1772 | return -EFAULT; |
1773 | ||
4909122f | 1774 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1775 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1776 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1777 | |
56f0dcc5 | 1778 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1779 | return -EINVAL; |
e1edab87 | 1780 | iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1781 | } |
1782 | ||
40630b82 | 1783 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1784 | align += NET_IP_ALIGN; |
0eca93bc | 1785 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1786 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1787 | return -EINVAL; |
1788 | } | |
6aa20a22 | 1789 | |
96f8d9ec JW |
1790 | good_linear = SKB_MAX_HEAD(align); |
1791 | ||
88529176 | 1792 | if (msg_control) { |
f5ff53b4 AV |
1793 | struct iov_iter i = *from; |
1794 | ||
88529176 JW |
1795 | /* There are 256 bytes to be copied in skb, so there is |
1796 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1797 | * The rest of the buffer is mapped from userspace. |
1798 | */ | |
56f0dcc5 | 1799 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1800 | if (copylen > good_linear) |
1801 | copylen = good_linear; | |
3dd5c330 | 1802 | linear = copylen; |
f5ff53b4 AV |
1803 | iov_iter_advance(&i, copylen); |
1804 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1805 | zerocopy = true; |
1806 | } | |
1807 | ||
90e33d45 | 1808 | if (!frags && tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) { |
1cfe6e93 JW |
1809 | /* For the packet that is not easy to be processed |
1810 | * (e.g gso or jumbo packet), we will do it at after | |
1811 | * skb was created with generic XDP routine. | |
1812 | */ | |
1813 | skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp); | |
66ccbc9c | 1814 | if (IS_ERR(skb)) { |
608b9977 | 1815 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
66ccbc9c JW |
1816 | return PTR_ERR(skb); |
1817 | } | |
761876c8 JW |
1818 | if (!skb) |
1819 | return total_len; | |
66ccbc9c JW |
1820 | } else { |
1821 | if (!zerocopy) { | |
1822 | copylen = len; | |
1823 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) | |
1824 | linear = good_linear; | |
1825 | else | |
1826 | linear = tun16_to_cpu(tun, gso.hdr_len); | |
1827 | } | |
1da177e4 | 1828 | |
90e33d45 PP |
1829 | if (frags) { |
1830 | mutex_lock(&tfile->napi_mutex); | |
1831 | skb = tun_napi_alloc_frags(tfile, copylen, from); | |
1832 | /* tun_napi_alloc_frags() enforces a layout for the skb. | |
1833 | * If zerocopy is enabled, then this layout will be | |
1834 | * overwritten by zerocopy_sg_from_iter(). | |
1835 | */ | |
1836 | zerocopy = false; | |
1837 | } else { | |
1838 | skb = tun_alloc_skb(tfile, align, copylen, linear, | |
1839 | noblock); | |
1840 | } | |
1841 | ||
66ccbc9c JW |
1842 | if (IS_ERR(skb)) { |
1843 | if (PTR_ERR(skb) != -EAGAIN) | |
1844 | this_cpu_inc(tun->pcpu_stats->rx_dropped); | |
90e33d45 PP |
1845 | if (frags) |
1846 | mutex_unlock(&tfile->napi_mutex); | |
66ccbc9c JW |
1847 | return PTR_ERR(skb); |
1848 | } | |
0690899b | 1849 | |
66ccbc9c JW |
1850 | if (zerocopy) |
1851 | err = zerocopy_sg_from_iter(skb, from); | |
1852 | else | |
1853 | err = skb_copy_datagram_from_iter(skb, 0, from, len); | |
1854 | ||
1855 | if (err) { | |
4477138f ED |
1856 | err = -EFAULT; |
1857 | drop: | |
66ccbc9c JW |
1858 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
1859 | kfree_skb(skb); | |
90e33d45 PP |
1860 | if (frags) { |
1861 | tfile->napi.skb = NULL; | |
1862 | mutex_unlock(&tfile->napi_mutex); | |
1863 | } | |
1864 | ||
4477138f | 1865 | return err; |
66ccbc9c | 1866 | } |
8f22757e | 1867 | } |
1da177e4 | 1868 | |
3e9e40e7 | 1869 | if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { |
df10db98 PA |
1870 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); |
1871 | kfree_skb(skb); | |
90e33d45 PP |
1872 | if (frags) { |
1873 | tfile->napi.skb = NULL; | |
1874 | mutex_unlock(&tfile->napi_mutex); | |
1875 | } | |
1876 | ||
df10db98 PA |
1877 | return -EINVAL; |
1878 | } | |
1879 | ||
1da177e4 | 1880 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1881 | case IFF_TUN: |
1882 | if (tun->flags & IFF_NO_PI) { | |
2580c4c1 AP |
1883 | u8 ip_version = skb->len ? (skb->data[0] >> 4) : 0; |
1884 | ||
1885 | switch (ip_version) { | |
1886 | case 4: | |
f09f7ee2 AWC |
1887 | pi.proto = htons(ETH_P_IP); |
1888 | break; | |
2580c4c1 | 1889 | case 6: |
f09f7ee2 AWC |
1890 | pi.proto = htons(ETH_P_IPV6); |
1891 | break; | |
1892 | default: | |
608b9977 | 1893 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
f09f7ee2 AWC |
1894 | kfree_skb(skb); |
1895 | return -EINVAL; | |
1896 | } | |
1897 | } | |
1898 | ||
459a98ed | 1899 | skb_reset_mac_header(skb); |
1da177e4 | 1900 | skb->protocol = pi.proto; |
4c13eb66 | 1901 | skb->dev = tun->dev; |
1da177e4 | 1902 | break; |
40630b82 | 1903 | case IFF_TAP: |
90e33d45 PP |
1904 | if (!frags) |
1905 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1da177e4 | 1906 | break; |
6403eab1 | 1907 | } |
1da177e4 | 1908 | |
0690899b MT |
1909 | /* copy skb_ubuf_info for callback when skb has no error */ |
1910 | if (zerocopy) { | |
1911 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1912 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1913 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
af1cc7a2 JW |
1914 | } else if (msg_control) { |
1915 | struct ubuf_info *uarg = msg_control; | |
1916 | uarg->callback(uarg, false); | |
0690899b MT |
1917 | } |
1918 | ||
72f65107 | 1919 | skb_reset_network_header(skb); |
d2aa125d | 1920 | skb_probe_transport_header(skb); |
38502af7 | 1921 | |
1cfe6e93 | 1922 | if (skb_xdp) { |
761876c8 JW |
1923 | struct bpf_prog *xdp_prog; |
1924 | int ret; | |
1925 | ||
6547e387 | 1926 | local_bh_disable(); |
761876c8 JW |
1927 | rcu_read_lock(); |
1928 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
1929 | if (xdp_prog) { | |
1930 | ret = do_xdp_generic(xdp_prog, skb); | |
1931 | if (ret != XDP_PASS) { | |
1932 | rcu_read_unlock(); | |
6547e387 | 1933 | local_bh_enable(); |
761876c8 JW |
1934 | return total_len; |
1935 | } | |
1936 | } | |
1937 | rcu_read_unlock(); | |
6547e387 | 1938 | local_bh_enable(); |
761876c8 JW |
1939 | } |
1940 | ||
cf1a1e07 PA |
1941 | /* Compute the costly rx hash only if needed for flow updates. |
1942 | * We may get a very small possibility of OOO during switching, not | |
1943 | * worth to optimize. | |
1944 | */ | |
1945 | if (!rcu_access_pointer(tun->steering_prog) && tun->numqueues > 1 && | |
1946 | !tfile->detached) | |
96f84061 | 1947 | rxhash = __skb_get_hash_symmetric(skb); |
94317099 | 1948 | |
4477138f ED |
1949 | rcu_read_lock(); |
1950 | if (unlikely(!(tun->dev->flags & IFF_UP))) { | |
1951 | err = -EIO; | |
9180bb4f | 1952 | rcu_read_unlock(); |
4477138f ED |
1953 | goto drop; |
1954 | } | |
1955 | ||
90e33d45 PP |
1956 | if (frags) { |
1957 | /* Exercise flow dissector code path. */ | |
c43f1255 SF |
1958 | u32 headlen = eth_get_headlen(tun->dev, skb->data, |
1959 | skb_headlen(skb)); | |
90e33d45 | 1960 | |
010f245b | 1961 | if (unlikely(headlen > skb_headlen(skb))) { |
90e33d45 PP |
1962 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
1963 | napi_free_frags(&tfile->napi); | |
4477138f | 1964 | rcu_read_unlock(); |
90e33d45 PP |
1965 | mutex_unlock(&tfile->napi_mutex); |
1966 | WARN_ON(1); | |
1967 | return -ENOMEM; | |
1968 | } | |
1969 | ||
1970 | local_bh_disable(); | |
1971 | napi_gro_frags(&tfile->napi); | |
1972 | local_bh_enable(); | |
1973 | mutex_unlock(&tfile->napi_mutex); | |
aec72f33 | 1974 | } else if (tfile->napi_enabled) { |
94317099 PP |
1975 | struct sk_buff_head *queue = &tfile->sk.sk_write_queue; |
1976 | int queue_len; | |
1977 | ||
1978 | spin_lock_bh(&queue->lock); | |
1979 | __skb_queue_tail(queue, skb); | |
1980 | queue_len = skb_queue_len(queue); | |
1981 | spin_unlock(&queue->lock); | |
1982 | ||
1983 | if (!more || queue_len > NAPI_POLL_WEIGHT) | |
1984 | napi_schedule(&tfile->napi); | |
1985 | ||
1986 | local_bh_enable(); | |
1987 | } else if (!IS_ENABLED(CONFIG_4KSTACKS)) { | |
1988 | tun_rx_batched(tun, tfile, skb, more); | |
1989 | } else { | |
1990 | netif_rx_ni(skb); | |
1991 | } | |
4477138f | 1992 | rcu_read_unlock(); |
6aa20a22 | 1993 | |
608b9977 PA |
1994 | stats = get_cpu_ptr(tun->pcpu_stats); |
1995 | u64_stats_update_begin(&stats->syncp); | |
1996 | stats->rx_packets++; | |
1997 | stats->rx_bytes += len; | |
1998 | u64_stats_update_end(&stats->syncp); | |
1999 | put_cpu_ptr(stats); | |
1da177e4 | 2000 | |
96f84061 JW |
2001 | if (rxhash) |
2002 | tun_flow_update(tun, rxhash, tfile); | |
2003 | ||
0690899b | 2004 | return total_len; |
6aa20a22 | 2005 | } |
1da177e4 | 2006 | |
f5ff53b4 | 2007 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 2008 | { |
33dccbb0 | 2009 | struct file *file = iocb->ki_filp; |
54f968d6 | 2010 | struct tun_file *tfile = file->private_data; |
9484dc74 | 2011 | struct tun_struct *tun = tun_get(tfile); |
631ab46b | 2012 | ssize_t result; |
1da177e4 LT |
2013 | |
2014 | if (!tun) | |
2015 | return -EBADFD; | |
2016 | ||
5503fcec JW |
2017 | result = tun_get_user(tun, tfile, NULL, from, |
2018 | file->f_flags & O_NONBLOCK, false); | |
631ab46b EB |
2019 | |
2020 | tun_put(tun); | |
2021 | return result; | |
1da177e4 LT |
2022 | } |
2023 | ||
fc72d1d5 JW |
2024 | static ssize_t tun_put_user_xdp(struct tun_struct *tun, |
2025 | struct tun_file *tfile, | |
1ffcbc85 | 2026 | struct xdp_frame *xdp_frame, |
fc72d1d5 JW |
2027 | struct iov_iter *iter) |
2028 | { | |
2029 | int vnet_hdr_sz = 0; | |
1ffcbc85 | 2030 | size_t size = xdp_frame->len; |
fc72d1d5 JW |
2031 | struct tun_pcpu_stats *stats; |
2032 | size_t ret; | |
2033 | ||
2034 | if (tun->flags & IFF_VNET_HDR) { | |
2035 | struct virtio_net_hdr gso = { 0 }; | |
2036 | ||
2037 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); | |
2038 | if (unlikely(iov_iter_count(iter) < vnet_hdr_sz)) | |
2039 | return -EINVAL; | |
2040 | if (unlikely(copy_to_iter(&gso, sizeof(gso), iter) != | |
2041 | sizeof(gso))) | |
2042 | return -EFAULT; | |
2043 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
2044 | } | |
2045 | ||
1ffcbc85 | 2046 | ret = copy_to_iter(xdp_frame->data, size, iter) + vnet_hdr_sz; |
fc72d1d5 JW |
2047 | |
2048 | stats = get_cpu_ptr(tun->pcpu_stats); | |
2049 | u64_stats_update_begin(&stats->syncp); | |
2050 | stats->tx_packets++; | |
2051 | stats->tx_bytes += ret; | |
2052 | u64_stats_update_end(&stats->syncp); | |
2053 | put_cpu_ptr(tun->pcpu_stats); | |
2054 | ||
2055 | return ret; | |
2056 | } | |
2057 | ||
1da177e4 | 2058 | /* Put packet to the user space buffer */ |
6f7c156c | 2059 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 2060 | struct tun_file *tfile, |
6f7c156c | 2061 | struct sk_buff *skb, |
e0b46d0e | 2062 | struct iov_iter *iter) |
1da177e4 LT |
2063 | { |
2064 | struct tun_pi pi = { 0, skb->protocol }; | |
608b9977 | 2065 | struct tun_pcpu_stats *stats; |
e0b46d0e | 2066 | ssize_t total; |
8c847d25 | 2067 | int vlan_offset = 0; |
a8f9bfdf | 2068 | int vlan_hlen = 0; |
2eb783c4 | 2069 | int vnet_hdr_sz = 0; |
a8f9bfdf | 2070 | |
df8a39de | 2071 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 2072 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 2073 | |
40630b82 | 2074 | if (tun->flags & IFF_VNET_HDR) |
e1edab87 | 2075 | vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); |
1da177e4 | 2076 | |
e0b46d0e HX |
2077 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
2078 | ||
40630b82 | 2079 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 2080 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
2081 | return -EINVAL; |
2082 | ||
e0b46d0e HX |
2083 | total += sizeof(pi); |
2084 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
2085 | /* Packet will be striped */ |
2086 | pi.flags |= TUN_PKT_STRIP; | |
2087 | } | |
6aa20a22 | 2088 | |
e0b46d0e | 2089 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 2090 | return -EFAULT; |
6aa20a22 | 2091 | } |
1da177e4 | 2092 | |
2eb783c4 | 2093 | if (vnet_hdr_sz) { |
9403cd7c | 2094 | struct virtio_net_hdr gso; |
34166093 | 2095 | |
e0b46d0e | 2096 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
2097 | return -EINVAL; |
2098 | ||
3e9e40e7 | 2099 | if (virtio_net_hdr_from_skb(skb, &gso, |
fd3a8862 WB |
2100 | tun_is_little_endian(tun), true, |
2101 | vlan_hlen)) { | |
f43798c2 | 2102 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
34166093 MR |
2103 | pr_err("unexpected GSO type: " |
2104 | "0x%x, gso_size %d, hdr_len %d\n", | |
2105 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), | |
2106 | tun16_to_cpu(tun, gso.hdr_len)); | |
2107 | print_hex_dump(KERN_ERR, "tun: ", | |
2108 | DUMP_PREFIX_NONE, | |
2109 | 16, 1, skb->head, | |
2110 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); | |
2111 | WARN_ON_ONCE(1); | |
2112 | return -EINVAL; | |
2113 | } | |
f43798c2 | 2114 | |
e0b46d0e | 2115 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 2116 | return -EFAULT; |
8c847d25 JW |
2117 | |
2118 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
2119 | } |
2120 | ||
a8f9bfdf | 2121 | if (vlan_hlen) { |
e0b46d0e | 2122 | int ret; |
aff3d70a | 2123 | struct veth veth; |
6680ec68 JW |
2124 | |
2125 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 2126 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
2127 | |
2128 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 2129 | |
e0b46d0e HX |
2130 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
2131 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
2132 | goto done; |
2133 | ||
e0b46d0e HX |
2134 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
2135 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
2136 | goto done; |
2137 | } | |
1da177e4 | 2138 | |
e0b46d0e | 2139 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 2140 | |
6680ec68 | 2141 | done: |
608b9977 PA |
2142 | /* caller is in process context, */ |
2143 | stats = get_cpu_ptr(tun->pcpu_stats); | |
2144 | u64_stats_update_begin(&stats->syncp); | |
2145 | stats->tx_packets++; | |
2146 | stats->tx_bytes += skb->len + vlan_hlen; | |
2147 | u64_stats_update_end(&stats->syncp); | |
2148 | put_cpu_ptr(tun->pcpu_stats); | |
1da177e4 LT |
2149 | |
2150 | return total; | |
2151 | } | |
2152 | ||
fc72d1d5 | 2153 | static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err) |
1576d986 JW |
2154 | { |
2155 | DECLARE_WAITQUEUE(wait, current); | |
fc72d1d5 | 2156 | void *ptr = NULL; |
f48cc6b2 | 2157 | int error = 0; |
1576d986 | 2158 | |
fc72d1d5 JW |
2159 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2160 | if (ptr) | |
1576d986 JW |
2161 | goto out; |
2162 | if (noblock) { | |
f48cc6b2 | 2163 | error = -EAGAIN; |
1576d986 JW |
2164 | goto out; |
2165 | } | |
2166 | ||
333f7909 | 2167 | add_wait_queue(&tfile->socket.wq.wait, &wait); |
1576d986 JW |
2168 | |
2169 | while (1) { | |
71828b22 | 2170 | set_current_state(TASK_INTERRUPTIBLE); |
fc72d1d5 JW |
2171 | ptr = ptr_ring_consume(&tfile->tx_ring); |
2172 | if (ptr) | |
1576d986 JW |
2173 | break; |
2174 | if (signal_pending(current)) { | |
f48cc6b2 | 2175 | error = -ERESTARTSYS; |
1576d986 JW |
2176 | break; |
2177 | } | |
2178 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { | |
f48cc6b2 | 2179 | error = -EFAULT; |
1576d986 JW |
2180 | break; |
2181 | } | |
2182 | ||
2183 | schedule(); | |
2184 | } | |
2185 | ||
ecef67cb | 2186 | __set_current_state(TASK_RUNNING); |
333f7909 | 2187 | remove_wait_queue(&tfile->socket.wq.wait, &wait); |
1576d986 JW |
2188 | |
2189 | out: | |
f48cc6b2 | 2190 | *err = error; |
fc72d1d5 | 2191 | return ptr; |
1576d986 JW |
2192 | } |
2193 | ||
54f968d6 | 2194 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 | 2195 | struct iov_iter *to, |
fc72d1d5 | 2196 | int noblock, void *ptr) |
1da177e4 | 2197 | { |
9b067034 | 2198 | ssize_t ret; |
1576d986 | 2199 | int err; |
1da177e4 | 2200 | |
3872baf6 | 2201 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 2202 | |
c33ee15b | 2203 | if (!iov_iter_count(to)) { |
fc72d1d5 | 2204 | tun_ptr_free(ptr); |
9b067034 | 2205 | return 0; |
c33ee15b | 2206 | } |
1da177e4 | 2207 | |
fc72d1d5 | 2208 | if (!ptr) { |
ac77cfd4 | 2209 | /* Read frames from ring */ |
fc72d1d5 JW |
2210 | ptr = tun_ring_recv(tfile, noblock, &err); |
2211 | if (!ptr) | |
ac77cfd4 JW |
2212 | return err; |
2213 | } | |
e0b46d0e | 2214 | |
1ffcbc85 JDB |
2215 | if (tun_is_xdp_frame(ptr)) { |
2216 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2217 | |
1ffcbc85 | 2218 | ret = tun_put_user_xdp(tun, tfile, xdpf, to); |
03993094 | 2219 | xdp_return_frame(xdpf); |
fc72d1d5 JW |
2220 | } else { |
2221 | struct sk_buff *skb = ptr; | |
2222 | ||
2223 | ret = tun_put_user(tun, tfile, skb, to); | |
2224 | if (unlikely(ret < 0)) | |
2225 | kfree_skb(skb); | |
2226 | else | |
2227 | consume_skb(skb); | |
2228 | } | |
1da177e4 | 2229 | |
05c2828c MT |
2230 | return ret; |
2231 | } | |
2232 | ||
9b067034 | 2233 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
2234 | { |
2235 | struct file *file = iocb->ki_filp; | |
2236 | struct tun_file *tfile = file->private_data; | |
9484dc74 | 2237 | struct tun_struct *tun = tun_get(tfile); |
9b067034 | 2238 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
2239 | |
2240 | if (!tun) | |
2241 | return -EBADFD; | |
ac77cfd4 | 2242 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL); |
42404c09 | 2243 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
2244 | if (ret > 0) |
2245 | iocb->ki_pos = ret; | |
631ab46b | 2246 | tun_put(tun); |
1da177e4 LT |
2247 | return ret; |
2248 | } | |
2249 | ||
cd5681d7 | 2250 | static void tun_prog_free(struct rcu_head *rcu) |
96f84061 | 2251 | { |
cd5681d7 | 2252 | struct tun_prog *prog = container_of(rcu, struct tun_prog, rcu); |
96f84061 JW |
2253 | |
2254 | bpf_prog_destroy(prog->prog); | |
2255 | kfree(prog); | |
2256 | } | |
2257 | ||
9d6474e4 JW |
2258 | static int __tun_set_ebpf(struct tun_struct *tun, |
2259 | struct tun_prog __rcu **prog_p, | |
cd5681d7 | 2260 | struct bpf_prog *prog) |
96f84061 | 2261 | { |
cd5681d7 | 2262 | struct tun_prog *old, *new = NULL; |
96f84061 JW |
2263 | |
2264 | if (prog) { | |
2265 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
2266 | if (!new) | |
2267 | return -ENOMEM; | |
2268 | new->prog = prog; | |
2269 | } | |
2270 | ||
124da8f6 | 2271 | spin_lock_bh(&tun->lock); |
cd5681d7 | 2272 | old = rcu_dereference_protected(*prog_p, |
124da8f6 | 2273 | lockdep_is_held(&tun->lock)); |
cd5681d7 | 2274 | rcu_assign_pointer(*prog_p, new); |
124da8f6 | 2275 | spin_unlock_bh(&tun->lock); |
96f84061 JW |
2276 | |
2277 | if (old) | |
cd5681d7 | 2278 | call_rcu(&old->rcu, tun_prog_free); |
96f84061 JW |
2279 | |
2280 | return 0; | |
2281 | } | |
2282 | ||
96442e42 JW |
2283 | static void tun_free_netdev(struct net_device *dev) |
2284 | { | |
2285 | struct tun_struct *tun = netdev_priv(dev); | |
2286 | ||
4008e97f | 2287 | BUG_ON(!(list_empty(&tun->disabled))); |
608b9977 | 2288 | free_percpu(tun->pcpu_stats); |
96442e42 | 2289 | tun_flow_uninit(tun); |
5dbbaf2d | 2290 | security_tun_dev_free_security(tun->security); |
cd5681d7 | 2291 | __tun_set_ebpf(tun, &tun->steering_prog, NULL); |
aff3d70a | 2292 | __tun_set_ebpf(tun, &tun->filter_prog, NULL); |
96442e42 JW |
2293 | } |
2294 | ||
1da177e4 LT |
2295 | static void tun_setup(struct net_device *dev) |
2296 | { | |
2297 | struct tun_struct *tun = netdev_priv(dev); | |
2298 | ||
0625c883 EB |
2299 | tun->owner = INVALID_UID; |
2300 | tun->group = INVALID_GID; | |
4e24f2dd | 2301 | tun_default_link_ksettings(dev, &tun->link_ksettings); |
1da177e4 | 2302 | |
1da177e4 | 2303 | dev->ethtool_ops = &tun_ethtool_ops; |
cf124db5 DM |
2304 | dev->needs_free_netdev = true; |
2305 | dev->priv_destructor = tun_free_netdev; | |
016adb72 JW |
2306 | /* We prefer our own queue length */ |
2307 | dev->tx_queue_len = TUN_READQ_SIZE; | |
1da177e4 LT |
2308 | } |
2309 | ||
f019a7a5 EB |
2310 | /* Trivial set of netlink ops to allow deleting tun or tap |
2311 | * device with netlink. | |
2312 | */ | |
a8b8a889 MS |
2313 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[], |
2314 | struct netlink_ext_ack *extack) | |
f019a7a5 | 2315 | { |
35b827b6 ND |
2316 | NL_SET_ERR_MSG(extack, |
2317 | "tun/tap creation via rtnetlink is not supported."); | |
2318 | return -EOPNOTSUPP; | |
f019a7a5 EB |
2319 | } |
2320 | ||
1ec010e7 SD |
2321 | static size_t tun_get_size(const struct net_device *dev) |
2322 | { | |
2323 | BUILD_BUG_ON(sizeof(u32) != sizeof(uid_t)); | |
2324 | BUILD_BUG_ON(sizeof(u32) != sizeof(gid_t)); | |
2325 | ||
2326 | return nla_total_size(sizeof(uid_t)) + /* OWNER */ | |
2327 | nla_total_size(sizeof(gid_t)) + /* GROUP */ | |
2328 | nla_total_size(sizeof(u8)) + /* TYPE */ | |
2329 | nla_total_size(sizeof(u8)) + /* PI */ | |
2330 | nla_total_size(sizeof(u8)) + /* VNET_HDR */ | |
2331 | nla_total_size(sizeof(u8)) + /* PERSIST */ | |
2332 | nla_total_size(sizeof(u8)) + /* MULTI_QUEUE */ | |
2333 | nla_total_size(sizeof(u32)) + /* NUM_QUEUES */ | |
2334 | nla_total_size(sizeof(u32)) + /* NUM_DISABLED_QUEUES */ | |
2335 | 0; | |
2336 | } | |
2337 | ||
2338 | static int tun_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
2339 | { | |
2340 | struct tun_struct *tun = netdev_priv(dev); | |
2341 | ||
2342 | if (nla_put_u8(skb, IFLA_TUN_TYPE, tun->flags & TUN_TYPE_MASK)) | |
2343 | goto nla_put_failure; | |
2344 | if (uid_valid(tun->owner) && | |
2345 | nla_put_u32(skb, IFLA_TUN_OWNER, | |
2346 | from_kuid_munged(current_user_ns(), tun->owner))) | |
2347 | goto nla_put_failure; | |
2348 | if (gid_valid(tun->group) && | |
2349 | nla_put_u32(skb, IFLA_TUN_GROUP, | |
2350 | from_kgid_munged(current_user_ns(), tun->group))) | |
2351 | goto nla_put_failure; | |
2352 | if (nla_put_u8(skb, IFLA_TUN_PI, !(tun->flags & IFF_NO_PI))) | |
2353 | goto nla_put_failure; | |
2354 | if (nla_put_u8(skb, IFLA_TUN_VNET_HDR, !!(tun->flags & IFF_VNET_HDR))) | |
2355 | goto nla_put_failure; | |
2356 | if (nla_put_u8(skb, IFLA_TUN_PERSIST, !!(tun->flags & IFF_PERSIST))) | |
2357 | goto nla_put_failure; | |
2358 | if (nla_put_u8(skb, IFLA_TUN_MULTI_QUEUE, | |
2359 | !!(tun->flags & IFF_MULTI_QUEUE))) | |
2360 | goto nla_put_failure; | |
2361 | if (tun->flags & IFF_MULTI_QUEUE) { | |
2362 | if (nla_put_u32(skb, IFLA_TUN_NUM_QUEUES, tun->numqueues)) | |
2363 | goto nla_put_failure; | |
2364 | if (nla_put_u32(skb, IFLA_TUN_NUM_DISABLED_QUEUES, | |
2365 | tun->numdisabled)) | |
2366 | goto nla_put_failure; | |
2367 | } | |
2368 | ||
2369 | return 0; | |
2370 | ||
2371 | nla_put_failure: | |
2372 | return -EMSGSIZE; | |
2373 | } | |
2374 | ||
f019a7a5 EB |
2375 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
2376 | .kind = DRV_NAME, | |
2377 | .priv_size = sizeof(struct tun_struct), | |
2378 | .setup = tun_setup, | |
2379 | .validate = tun_validate, | |
1ec010e7 SD |
2380 | .get_size = tun_get_size, |
2381 | .fill_info = tun_fill_info, | |
f019a7a5 EB |
2382 | }; |
2383 | ||
33dccbb0 HX |
2384 | static void tun_sock_write_space(struct sock *sk) |
2385 | { | |
54f968d6 | 2386 | struct tun_file *tfile; |
43815482 | 2387 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
2388 | |
2389 | if (!sock_writeable(sk)) | |
2390 | return; | |
2391 | ||
9cd3e072 | 2392 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
33dccbb0 HX |
2393 | return; |
2394 | ||
43815482 ED |
2395 | wqueue = sk_sleep(sk); |
2396 | if (wqueue && waitqueue_active(wqueue)) | |
a9a08845 LT |
2397 | wake_up_interruptible_sync_poll(wqueue, EPOLLOUT | |
2398 | EPOLLWRNORM | EPOLLWRBAND); | |
c722c625 | 2399 | |
54f968d6 JW |
2400 | tfile = container_of(sk, struct tun_file, sk); |
2401 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
2402 | } |
2403 | ||
f9e06c45 JW |
2404 | static void tun_put_page(struct tun_page *tpage) |
2405 | { | |
2406 | if (tpage->page) | |
2407 | __page_frag_cache_drain(tpage->page, tpage->count); | |
2408 | } | |
2409 | ||
043d222f JW |
2410 | static int tun_xdp_one(struct tun_struct *tun, |
2411 | struct tun_file *tfile, | |
f9e06c45 JW |
2412 | struct xdp_buff *xdp, int *flush, |
2413 | struct tun_page *tpage) | |
043d222f | 2414 | { |
4e4b08e5 | 2415 | unsigned int datasize = xdp->data_end - xdp->data; |
043d222f JW |
2416 | struct tun_xdp_hdr *hdr = xdp->data_hard_start; |
2417 | struct virtio_net_hdr *gso = &hdr->gso; | |
2418 | struct tun_pcpu_stats *stats; | |
2419 | struct bpf_prog *xdp_prog; | |
2420 | struct sk_buff *skb = NULL; | |
2421 | u32 rxhash = 0, act; | |
2422 | int buflen = hdr->buflen; | |
2423 | int err = 0; | |
2424 | bool skb_xdp = false; | |
f9e06c45 | 2425 | struct page *page; |
043d222f JW |
2426 | |
2427 | xdp_prog = rcu_dereference(tun->xdp_prog); | |
2428 | if (xdp_prog) { | |
2429 | if (gso->gso_type) { | |
2430 | skb_xdp = true; | |
2431 | goto build; | |
2432 | } | |
2433 | xdp_set_data_meta_invalid(xdp); | |
2434 | xdp->rxq = &tfile->xdp_rxq; | |
2435 | ||
2436 | act = bpf_prog_run_xdp(xdp_prog, xdp); | |
2437 | err = tun_xdp_act(tun, xdp_prog, xdp, act); | |
2438 | if (err < 0) { | |
2439 | put_page(virt_to_head_page(xdp->data)); | |
2440 | return err; | |
2441 | } | |
2442 | ||
2443 | switch (err) { | |
2444 | case XDP_REDIRECT: | |
2445 | *flush = true; | |
2446 | /* fall through */ | |
2447 | case XDP_TX: | |
2448 | return 0; | |
2449 | case XDP_PASS: | |
2450 | break; | |
2451 | default: | |
f9e06c45 JW |
2452 | page = virt_to_head_page(xdp->data); |
2453 | if (tpage->page == page) { | |
2454 | ++tpage->count; | |
2455 | } else { | |
2456 | tun_put_page(tpage); | |
2457 | tpage->page = page; | |
2458 | tpage->count = 1; | |
2459 | } | |
043d222f JW |
2460 | return 0; |
2461 | } | |
2462 | } | |
2463 | ||
2464 | build: | |
2465 | skb = build_skb(xdp->data_hard_start, buflen); | |
2466 | if (!skb) { | |
2467 | err = -ENOMEM; | |
2468 | goto out; | |
2469 | } | |
2470 | ||
2471 | skb_reserve(skb, xdp->data - xdp->data_hard_start); | |
2472 | skb_put(skb, xdp->data_end - xdp->data); | |
2473 | ||
2474 | if (virtio_net_hdr_to_skb(skb, gso, tun_is_little_endian(tun))) { | |
2475 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); | |
2476 | kfree_skb(skb); | |
2477 | err = -EINVAL; | |
2478 | goto out; | |
2479 | } | |
2480 | ||
2481 | skb->protocol = eth_type_trans(skb, tun->dev); | |
2482 | skb_reset_network_header(skb); | |
d2aa125d | 2483 | skb_probe_transport_header(skb); |
043d222f JW |
2484 | |
2485 | if (skb_xdp) { | |
2486 | err = do_xdp_generic(xdp_prog, skb); | |
2487 | if (err != XDP_PASS) | |
2488 | goto out; | |
2489 | } | |
2490 | ||
f29eb2a9 PA |
2491 | if (!rcu_dereference(tun->steering_prog) && tun->numqueues > 1 && |
2492 | !tfile->detached) | |
043d222f JW |
2493 | rxhash = __skb_get_hash_symmetric(skb); |
2494 | ||
8ebebcba | 2495 | skb_record_rx_queue(skb, tfile->queue_index); |
043d222f JW |
2496 | netif_receive_skb(skb); |
2497 | ||
6342ca64 PB |
2498 | /* No need for get_cpu_ptr() here since this function is |
2499 | * always called with bh disabled | |
2500 | */ | |
2501 | stats = this_cpu_ptr(tun->pcpu_stats); | |
043d222f JW |
2502 | u64_stats_update_begin(&stats->syncp); |
2503 | stats->rx_packets++; | |
4e4b08e5 | 2504 | stats->rx_bytes += datasize; |
043d222f | 2505 | u64_stats_update_end(&stats->syncp); |
043d222f JW |
2506 | |
2507 | if (rxhash) | |
2508 | tun_flow_update(tun, rxhash, tfile); | |
2509 | ||
2510 | out: | |
2511 | return err; | |
2512 | } | |
2513 | ||
1b784140 | 2514 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 2515 | { |
043d222f | 2516 | int ret, i; |
54f968d6 | 2517 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
9484dc74 | 2518 | struct tun_struct *tun = tun_get(tfile); |
fe8dd45b | 2519 | struct tun_msg_ctl *ctl = m->msg_control; |
043d222f | 2520 | struct xdp_buff *xdp; |
54f968d6 JW |
2521 | |
2522 | if (!tun) | |
2523 | return -EBADFD; | |
f5ff53b4 | 2524 | |
043d222f | 2525 | if (ctl && (ctl->type == TUN_MSG_PTR)) { |
6f0271d9 | 2526 | struct tun_page tpage; |
043d222f JW |
2527 | int n = ctl->num; |
2528 | int flush = 0; | |
2529 | ||
6f0271d9 DM |
2530 | memset(&tpage, 0, sizeof(tpage)); |
2531 | ||
043d222f JW |
2532 | local_bh_disable(); |
2533 | rcu_read_lock(); | |
2534 | ||
2535 | for (i = 0; i < n; i++) { | |
2536 | xdp = &((struct xdp_buff *)ctl->ptr)[i]; | |
f9e06c45 | 2537 | tun_xdp_one(tun, tfile, xdp, &flush, &tpage); |
043d222f JW |
2538 | } |
2539 | ||
2540 | if (flush) | |
2541 | xdp_do_flush_map(); | |
2542 | ||
2543 | rcu_read_unlock(); | |
2544 | local_bh_enable(); | |
2545 | ||
f9e06c45 JW |
2546 | tun_put_page(&tpage); |
2547 | ||
043d222f JW |
2548 | ret = total_len; |
2549 | goto out; | |
2550 | } | |
fe8dd45b JW |
2551 | |
2552 | ret = tun_get_user(tun, tfile, ctl ? ctl->ptr : NULL, &m->msg_iter, | |
5503fcec JW |
2553 | m->msg_flags & MSG_DONTWAIT, |
2554 | m->msg_flags & MSG_MORE); | |
043d222f | 2555 | out: |
54f968d6 JW |
2556 | tun_put(tun); |
2557 | return ret; | |
05c2828c MT |
2558 | } |
2559 | ||
1b784140 | 2560 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
2561 | int flags) |
2562 | { | |
54f968d6 | 2563 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
9484dc74 | 2564 | struct tun_struct *tun = tun_get(tfile); |
fc72d1d5 | 2565 | void *ptr = m->msg_control; |
05c2828c | 2566 | int ret; |
54f968d6 | 2567 | |
c33ee15b WX |
2568 | if (!tun) { |
2569 | ret = -EBADFD; | |
fc72d1d5 | 2570 | goto out_free; |
c33ee15b | 2571 | } |
54f968d6 | 2572 | |
eda29772 | 2573 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 | 2574 | ret = -EINVAL; |
c33ee15b | 2575 | goto out_put_tun; |
3811ae76 | 2576 | } |
eda29772 RC |
2577 | if (flags & MSG_ERRQUEUE) { |
2578 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
2579 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
2580 | goto out; | |
2581 | } | |
fc72d1d5 | 2582 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, ptr); |
87897931 | 2583 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
2584 | m->msg_flags |= MSG_TRUNC; |
2585 | ret = flags & MSG_TRUNC ? ret : total_len; | |
2586 | } | |
3811ae76 | 2587 | out: |
54f968d6 | 2588 | tun_put(tun); |
05c2828c | 2589 | return ret; |
c33ee15b WX |
2590 | |
2591 | out_put_tun: | |
2592 | tun_put(tun); | |
fc72d1d5 JW |
2593 | out_free: |
2594 | tun_ptr_free(ptr); | |
c33ee15b | 2595 | return ret; |
05c2828c MT |
2596 | } |
2597 | ||
fc72d1d5 JW |
2598 | static int tun_ptr_peek_len(void *ptr) |
2599 | { | |
2600 | if (likely(ptr)) { | |
1ffcbc85 JDB |
2601 | if (tun_is_xdp_frame(ptr)) { |
2602 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 2603 | |
1ffcbc85 | 2604 | return xdpf->len; |
fc72d1d5 JW |
2605 | } |
2606 | return __skb_array_len_with_tag(ptr); | |
2607 | } else { | |
2608 | return 0; | |
2609 | } | |
2610 | } | |
2611 | ||
1576d986 JW |
2612 | static int tun_peek_len(struct socket *sock) |
2613 | { | |
2614 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
2615 | struct tun_struct *tun; | |
2616 | int ret = 0; | |
2617 | ||
9484dc74 | 2618 | tun = tun_get(tfile); |
1576d986 JW |
2619 | if (!tun) |
2620 | return 0; | |
2621 | ||
fc72d1d5 | 2622 | ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, tun_ptr_peek_len); |
1576d986 JW |
2623 | tun_put(tun); |
2624 | ||
2625 | return ret; | |
2626 | } | |
2627 | ||
05c2828c MT |
2628 | /* Ops structure to mimic raw sockets with tun */ |
2629 | static const struct proto_ops tun_socket_ops = { | |
1576d986 | 2630 | .peek_len = tun_peek_len, |
05c2828c MT |
2631 | .sendmsg = tun_sendmsg, |
2632 | .recvmsg = tun_recvmsg, | |
2633 | }; | |
2634 | ||
33dccbb0 HX |
2635 | static struct proto tun_proto = { |
2636 | .name = "tun", | |
2637 | .owner = THIS_MODULE, | |
54f968d6 | 2638 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 2639 | }; |
f019a7a5 | 2640 | |
980c9e8c DW |
2641 | static int tun_flags(struct tun_struct *tun) |
2642 | { | |
031f5e03 | 2643 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
2644 | } |
2645 | ||
2646 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
2647 | char *buf) | |
2648 | { | |
2649 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
2650 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
2651 | } | |
2652 | ||
2653 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
2654 | char *buf) | |
2655 | { | |
2656 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
2657 | return uid_valid(tun->owner)? |
2658 | sprintf(buf, "%u\n", | |
2659 | from_kuid_munged(current_user_ns(), tun->owner)): | |
2660 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
2661 | } |
2662 | ||
2663 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
2664 | char *buf) | |
2665 | { | |
2666 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
2667 | return gid_valid(tun->group) ? |
2668 | sprintf(buf, "%u\n", | |
2669 | from_kgid_munged(current_user_ns(), tun->group)): | |
2670 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
2671 | } |
2672 | ||
2673 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
2674 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
2675 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
2676 | ||
c4d33e24 TI |
2677 | static struct attribute *tun_dev_attrs[] = { |
2678 | &dev_attr_tun_flags.attr, | |
2679 | &dev_attr_owner.attr, | |
2680 | &dev_attr_group.attr, | |
2681 | NULL | |
2682 | }; | |
2683 | ||
2684 | static const struct attribute_group tun_attr_group = { | |
2685 | .attrs = tun_dev_attrs | |
2686 | }; | |
2687 | ||
d647a591 | 2688 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
2689 | { |
2690 | struct tun_struct *tun; | |
54f968d6 | 2691 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2692 | struct net_device *dev; |
2693 | int err; | |
2694 | ||
7c0c3b1a JW |
2695 | if (tfile->detached) |
2696 | return -EINVAL; | |
2697 | ||
90e33d45 PP |
2698 | if ((ifr->ifr_flags & IFF_NAPI_FRAGS)) { |
2699 | if (!capable(CAP_NET_ADMIN)) | |
2700 | return -EPERM; | |
2701 | ||
2702 | if (!(ifr->ifr_flags & IFF_NAPI) || | |
2703 | (ifr->ifr_flags & TUN_TYPE_MASK) != IFF_TAP) | |
2704 | return -EINVAL; | |
2705 | } | |
2706 | ||
74a3e5a7 EB |
2707 | dev = __dev_get_by_name(net, ifr->ifr_name); |
2708 | if (dev) { | |
f85ba780 DW |
2709 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
2710 | return -EBUSY; | |
74a3e5a7 EB |
2711 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
2712 | tun = netdev_priv(dev); | |
2713 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
2714 | tun = netdev_priv(dev); | |
2715 | else | |
2716 | return -EINVAL; | |
2717 | ||
8e6d91ae | 2718 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 2719 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
2720 | return -EINVAL; |
2721 | ||
cde8b15f | 2722 | if (tun_not_capable(tun)) |
2b980dbd | 2723 | return -EPERM; |
5dbbaf2d | 2724 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
2725 | if (err < 0) |
2726 | return err; | |
2727 | ||
94317099 | 2728 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER, |
af3fb24e ED |
2729 | ifr->ifr_flags & IFF_NAPI, |
2730 | ifr->ifr_flags & IFF_NAPI_FRAGS); | |
a7385ba2 EB |
2731 | if (err < 0) |
2732 | return err; | |
4008e97f | 2733 | |
40630b82 | 2734 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
2735 | (tun->numqueues + tun->numdisabled > 1)) { |
2736 | /* One or more queue has already been attached, no need | |
2737 | * to initialize the device again. | |
2738 | */ | |
83c1f36f | 2739 | netdev_state_change(dev); |
e8dbad66 JW |
2740 | return 0; |
2741 | } | |
9fffc5c6 SD |
2742 | |
2743 | tun->flags = (tun->flags & ~TUN_FEATURES) | | |
2744 | (ifr->ifr_flags & TUN_FEATURES); | |
83c1f36f SD |
2745 | |
2746 | netdev_state_change(dev); | |
2747 | } else { | |
1da177e4 LT |
2748 | char *name; |
2749 | unsigned long flags = 0; | |
edfb6a14 JW |
2750 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
2751 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 2752 | |
c260b772 | 2753 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 2754 | return -EPERM; |
2b980dbd PM |
2755 | err = security_tun_dev_create(); |
2756 | if (err < 0) | |
2757 | return err; | |
ca6bb5d7 | 2758 | |
1da177e4 LT |
2759 | /* Set dev type */ |
2760 | if (ifr->ifr_flags & IFF_TUN) { | |
2761 | /* TUN device */ | |
40630b82 | 2762 | flags |= IFF_TUN; |
1da177e4 LT |
2763 | name = "tun%d"; |
2764 | } else if (ifr->ifr_flags & IFF_TAP) { | |
2765 | /* TAP device */ | |
40630b82 | 2766 | flags |= IFF_TAP; |
1da177e4 | 2767 | name = "tap%d"; |
6aa20a22 | 2768 | } else |
36989b90 | 2769 | return -EINVAL; |
6aa20a22 | 2770 | |
1da177e4 LT |
2771 | if (*ifr->ifr_name) |
2772 | name = ifr->ifr_name; | |
2773 | ||
c8d68e6b | 2774 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
2775 | NET_NAME_UNKNOWN, tun_setup, queues, |
2776 | queues); | |
edfb6a14 | 2777 | |
1da177e4 LT |
2778 | if (!dev) |
2779 | return -ENOMEM; | |
0ad646c8 | 2780 | err = dev_get_valid_name(net, dev, name); |
5c25f65f | 2781 | if (err < 0) |
0ad646c8 | 2782 | goto err_free_dev; |
1da177e4 | 2783 | |
fc54c658 | 2784 | dev_net_set(dev, net); |
f019a7a5 | 2785 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 2786 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 2787 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 2788 | |
1da177e4 LT |
2789 | tun = netdev_priv(dev); |
2790 | tun->dev = dev; | |
2791 | tun->flags = flags; | |
f271b2cc | 2792 | tun->txflt.count = 0; |
d9d52b51 | 2793 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 2794 | |
eaea34b2 | 2795 | tun->align = NET_SKB_PAD; |
54f968d6 JW |
2796 | tun->filter_attached = false; |
2797 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
5503fcec | 2798 | tun->rx_batched = 0; |
96f84061 | 2799 | RCU_INIT_POINTER(tun->steering_prog, NULL); |
33dccbb0 | 2800 | |
608b9977 PA |
2801 | tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); |
2802 | if (!tun->pcpu_stats) { | |
2803 | err = -ENOMEM; | |
2804 | goto err_free_dev; | |
2805 | } | |
2806 | ||
96442e42 JW |
2807 | spin_lock_init(&tun->lock); |
2808 | ||
5dbbaf2d PM |
2809 | err = security_tun_dev_alloc_security(&tun->security); |
2810 | if (err < 0) | |
608b9977 | 2811 | goto err_free_stat; |
2b980dbd | 2812 | |
1da177e4 | 2813 | tun_net_init(dev); |
944a1376 | 2814 | tun_flow_init(tun); |
96442e42 | 2815 | |
88255375 | 2816 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
2817 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
2818 | NETIF_F_HW_VLAN_STAG_TX; | |
2a2bbf17 | 2819 | dev->features = dev->hw_features | NETIF_F_LLTX; |
6671b224 FLVC |
2820 | dev->vlan_features = dev->features & |
2821 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
2822 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 2823 | |
9fffc5c6 SD |
2824 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
2825 | (ifr->ifr_flags & TUN_FEATURES); | |
2826 | ||
4008e97f | 2827 | INIT_LIST_HEAD(&tun->disabled); |
af3fb24e ED |
2828 | err = tun_attach(tun, file, false, ifr->ifr_flags & IFF_NAPI, |
2829 | ifr->ifr_flags & IFF_NAPI_FRAGS); | |
eb0fb363 | 2830 | if (err < 0) |
662ca437 | 2831 | goto err_free_flow; |
eb0fb363 | 2832 | |
1da177e4 LT |
2833 | err = register_netdevice(tun->dev); |
2834 | if (err < 0) | |
662ca437 | 2835 | goto err_detach; |
1da177e4 LT |
2836 | } |
2837 | ||
af668b3c MT |
2838 | netif_carrier_on(tun->dev); |
2839 | ||
6b8a66ee | 2840 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 2841 | |
e35259a9 MK |
2842 | /* Make sure persistent devices do not get stuck in |
2843 | * xoff state. | |
2844 | */ | |
2845 | if (netif_running(tun->dev)) | |
c8d68e6b | 2846 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 2847 | |
1da177e4 LT |
2848 | strcpy(ifr->ifr_name, tun->dev->name); |
2849 | return 0; | |
2850 | ||
662ca437 JW |
2851 | err_detach: |
2852 | tun_detach_all(dev); | |
ff244c6b ED |
2853 | /* register_netdevice() already called tun_free_netdev() */ |
2854 | goto err_free_dev; | |
2855 | ||
662ca437 JW |
2856 | err_free_flow: |
2857 | tun_flow_uninit(tun); | |
2858 | security_tun_dev_free_security(tun->security); | |
608b9977 PA |
2859 | err_free_stat: |
2860 | free_percpu(tun->pcpu_stats); | |
662ca437 | 2861 | err_free_dev: |
1da177e4 | 2862 | free_netdev(dev); |
1da177e4 LT |
2863 | return err; |
2864 | } | |
2865 | ||
12132768 | 2866 | static void tun_get_iff(struct tun_struct *tun, struct ifreq *ifr) |
e3b99556 | 2867 | { |
6b8a66ee | 2868 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
2869 | |
2870 | strcpy(ifr->ifr_name, tun->dev->name); | |
2871 | ||
980c9e8c | 2872 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 2873 | |
e3b99556 MM |
2874 | } |
2875 | ||
5228ddc9 RR |
2876 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
2877 | * privs required. */ | |
88255375 | 2878 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 2879 | { |
c8f44aff | 2880 | netdev_features_t features = 0; |
5228ddc9 RR |
2881 | |
2882 | if (arg & TUN_F_CSUM) { | |
88255375 | 2883 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
2884 | arg &= ~TUN_F_CSUM; |
2885 | ||
2886 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
2887 | if (arg & TUN_F_TSO_ECN) { | |
2888 | features |= NETIF_F_TSO_ECN; | |
2889 | arg &= ~TUN_F_TSO_ECN; | |
2890 | } | |
2891 | if (arg & TUN_F_TSO4) | |
2892 | features |= NETIF_F_TSO; | |
2893 | if (arg & TUN_F_TSO6) | |
2894 | features |= NETIF_F_TSO6; | |
2895 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
2896 | } | |
0c19f846 WB |
2897 | |
2898 | arg &= ~TUN_F_UFO; | |
5228ddc9 RR |
2899 | } |
2900 | ||
2901 | /* This gives the user a way to test for new features in future by | |
2902 | * trying to set them. */ | |
2903 | if (arg) | |
2904 | return -EINVAL; | |
2905 | ||
88255375 | 2906 | tun->set_features = features; |
09050957 YI |
2907 | tun->dev->wanted_features &= ~TUN_USER_FEATURES; |
2908 | tun->dev->wanted_features |= features; | |
88255375 | 2909 | netdev_update_features(tun->dev); |
5228ddc9 RR |
2910 | |
2911 | return 0; | |
2912 | } | |
2913 | ||
c8d68e6b JW |
2914 | static void tun_detach_filter(struct tun_struct *tun, int n) |
2915 | { | |
2916 | int i; | |
2917 | struct tun_file *tfile; | |
2918 | ||
2919 | for (i = 0; i < n; i++) { | |
b8deabd3 | 2920 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2921 | lock_sock(tfile->socket.sk); |
2922 | sk_detach_filter(tfile->socket.sk); | |
2923 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2924 | } |
2925 | ||
2926 | tun->filter_attached = false; | |
2927 | } | |
2928 | ||
2929 | static int tun_attach_filter(struct tun_struct *tun) | |
2930 | { | |
2931 | int i, ret = 0; | |
2932 | struct tun_file *tfile; | |
2933 | ||
2934 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2935 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
2936 | lock_sock(tfile->socket.sk); |
2937 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
2938 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
2939 | if (ret) { |
2940 | tun_detach_filter(tun, i); | |
2941 | return ret; | |
2942 | } | |
2943 | } | |
2944 | ||
2945 | tun->filter_attached = true; | |
2946 | return ret; | |
2947 | } | |
2948 | ||
2949 | static void tun_set_sndbuf(struct tun_struct *tun) | |
2950 | { | |
2951 | struct tun_file *tfile; | |
2952 | int i; | |
2953 | ||
2954 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 2955 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
2956 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
2957 | } | |
2958 | } | |
2959 | ||
cde8b15f JW |
2960 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
2961 | { | |
2962 | struct tun_file *tfile = file->private_data; | |
2963 | struct tun_struct *tun; | |
cde8b15f JW |
2964 | int ret = 0; |
2965 | ||
2966 | rtnl_lock(); | |
2967 | ||
2968 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 2969 | tun = tfile->detached; |
5dbbaf2d | 2970 | if (!tun) { |
cde8b15f | 2971 | ret = -EINVAL; |
5dbbaf2d PM |
2972 | goto unlock; |
2973 | } | |
2974 | ret = security_tun_dev_attach_queue(tun->security); | |
2975 | if (ret < 0) | |
2976 | goto unlock; | |
af3fb24e ED |
2977 | ret = tun_attach(tun, file, false, tun->flags & IFF_NAPI, |
2978 | tun->flags & IFF_NAPI_FRAGS); | |
4008e97f | 2979 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 2980 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 2981 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
2982 | ret = -EINVAL; |
2983 | else | |
2984 | __tun_detach(tfile, false); | |
2985 | } else | |
cde8b15f JW |
2986 | ret = -EINVAL; |
2987 | ||
83c1f36f SD |
2988 | if (ret >= 0) |
2989 | netdev_state_change(tun->dev); | |
2990 | ||
5dbbaf2d | 2991 | unlock: |
cde8b15f JW |
2992 | rtnl_unlock(); |
2993 | return ret; | |
2994 | } | |
2995 | ||
cd5681d7 JW |
2996 | static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog **prog_p, |
2997 | void __user *data) | |
96f84061 JW |
2998 | { |
2999 | struct bpf_prog *prog; | |
3000 | int fd; | |
3001 | ||
3002 | if (copy_from_user(&fd, data, sizeof(fd))) | |
3003 | return -EFAULT; | |
3004 | ||
3005 | if (fd == -1) { | |
3006 | prog = NULL; | |
3007 | } else { | |
3008 | prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); | |
3009 | if (IS_ERR(prog)) | |
3010 | return PTR_ERR(prog); | |
3011 | } | |
3012 | ||
cd5681d7 | 3013 | return __tun_set_ebpf(tun, prog_p, prog); |
96f84061 JW |
3014 | } |
3015 | ||
50857e2a AB |
3016 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
3017 | unsigned long arg, int ifreq_len) | |
1da177e4 | 3018 | { |
36b50bab | 3019 | struct tun_file *tfile = file->private_data; |
f663706a | 3020 | struct net *net = sock_net(&tfile->sk); |
631ab46b | 3021 | struct tun_struct *tun; |
1da177e4 | 3022 | void __user* argp = (void __user*)arg; |
26d31925 | 3023 | unsigned int ifindex, carrier; |
1da177e4 | 3024 | struct ifreq ifr; |
0625c883 EB |
3025 | kuid_t owner; |
3026 | kgid_t group; | |
33dccbb0 | 3027 | int sndbuf; |
d9d52b51 | 3028 | int vnet_hdr_sz; |
1cf8e410 | 3029 | int le; |
f271b2cc | 3030 | int ret; |
83c1f36f | 3031 | bool do_notify = false; |
1da177e4 | 3032 | |
f2780d6d KT |
3033 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || |
3034 | (_IOC_TYPE(cmd) == SOCK_IOC_TYPE && cmd != SIOCGSKNS)) { | |
50857e2a | 3035 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 3036 | return -EFAULT; |
8bbb1813 | 3037 | } else { |
a117dacd | 3038 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 3039 | } |
631ab46b EB |
3040 | if (cmd == TUNGETFEATURES) { |
3041 | /* Currently this just means: "what IFF flags are valid?". | |
3042 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
3043 | * TUNSETIFF. |
3044 | */ | |
3045 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 3046 | (unsigned int __user*)argp); |
f663706a | 3047 | } else if (cmd == TUNSETQUEUE) { |
cde8b15f | 3048 | return tun_set_queue(file, &ifr); |
f663706a KT |
3049 | } else if (cmd == SIOCGSKNS) { |
3050 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
3051 | return -EPERM; | |
3052 | return open_related_ns(&net->ns, get_net_ns); | |
3053 | } | |
631ab46b | 3054 | |
c8d68e6b | 3055 | ret = 0; |
876bfd4d HX |
3056 | rtnl_lock(); |
3057 | ||
9484dc74 | 3058 | tun = tun_get(tfile); |
0f16bc13 GF |
3059 | if (cmd == TUNSETIFF) { |
3060 | ret = -EEXIST; | |
3061 | if (tun) | |
3062 | goto unlock; | |
3063 | ||
1da177e4 LT |
3064 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
3065 | ||
f2780d6d | 3066 | ret = tun_set_iff(net, file, &ifr); |
1da177e4 | 3067 | |
876bfd4d HX |
3068 | if (ret) |
3069 | goto unlock; | |
1da177e4 | 3070 | |
50857e2a | 3071 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
3072 | ret = -EFAULT; |
3073 | goto unlock; | |
1da177e4 | 3074 | } |
fb7589a1 PE |
3075 | if (cmd == TUNSETIFINDEX) { |
3076 | ret = -EPERM; | |
3077 | if (tun) | |
3078 | goto unlock; | |
3079 | ||
3080 | ret = -EFAULT; | |
3081 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
3082 | goto unlock; | |
3083 | ||
3084 | ret = 0; | |
3085 | tfile->ifindex = ifindex; | |
3086 | goto unlock; | |
3087 | } | |
1da177e4 | 3088 | |
876bfd4d | 3089 | ret = -EBADFD; |
1da177e4 | 3090 | if (!tun) |
876bfd4d | 3091 | goto unlock; |
1da177e4 | 3092 | |
1e588338 | 3093 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 3094 | |
0c3e0e3b | 3095 | net = dev_net(tun->dev); |
631ab46b | 3096 | ret = 0; |
1da177e4 | 3097 | switch (cmd) { |
e3b99556 | 3098 | case TUNGETIFF: |
12132768 | 3099 | tun_get_iff(tun, &ifr); |
e3b99556 | 3100 | |
3d407a80 PE |
3101 | if (tfile->detached) |
3102 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
3103 | if (!tfile->socket.sk->sk_filter) |
3104 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 3105 | |
50857e2a | 3106 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 3107 | ret = -EFAULT; |
e3b99556 MM |
3108 | break; |
3109 | ||
1da177e4 LT |
3110 | case TUNSETNOCSUM: |
3111 | /* Disable/Enable checksum */ | |
1da177e4 | 3112 | |
88255375 MM |
3113 | /* [unimplemented] */ |
3114 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 3115 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
3116 | break; |
3117 | ||
3118 | case TUNSETPERSIST: | |
54f968d6 JW |
3119 | /* Disable/Enable persist mode. Keep an extra reference to the |
3120 | * module to prevent the module being unprobed. | |
3121 | */ | |
40630b82 MT |
3122 | if (arg && !(tun->flags & IFF_PERSIST)) { |
3123 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 3124 | __module_get(THIS_MODULE); |
83c1f36f | 3125 | do_notify = true; |
dd38bd85 | 3126 | } |
40630b82 MT |
3127 | if (!arg && (tun->flags & IFF_PERSIST)) { |
3128 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 | 3129 | module_put(THIS_MODULE); |
83c1f36f | 3130 | do_notify = true; |
54f968d6 | 3131 | } |
1da177e4 | 3132 | |
6b8a66ee JP |
3133 | tun_debug(KERN_INFO, tun, "persist %s\n", |
3134 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
3135 | break; |
3136 | ||
3137 | case TUNSETOWNER: | |
3138 | /* Set owner of the device */ | |
0625c883 EB |
3139 | owner = make_kuid(current_user_ns(), arg); |
3140 | if (!uid_valid(owner)) { | |
3141 | ret = -EINVAL; | |
3142 | break; | |
3143 | } | |
3144 | tun->owner = owner; | |
83c1f36f | 3145 | do_notify = true; |
1e588338 | 3146 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 3147 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
3148 | break; |
3149 | ||
8c644623 GG |
3150 | case TUNSETGROUP: |
3151 | /* Set group of the device */ | |
0625c883 EB |
3152 | group = make_kgid(current_user_ns(), arg); |
3153 | if (!gid_valid(group)) { | |
3154 | ret = -EINVAL; | |
3155 | break; | |
3156 | } | |
3157 | tun->group = group; | |
83c1f36f | 3158 | do_notify = true; |
1e588338 | 3159 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 3160 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
3161 | break; |
3162 | ||
ff4cc3ac MK |
3163 | case TUNSETLINK: |
3164 | /* Only allow setting the type when the interface is down */ | |
3165 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
3166 | tun_debug(KERN_INFO, tun, |
3167 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 3168 | ret = -EBUSY; |
ff4cc3ac MK |
3169 | } else { |
3170 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
3171 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
3172 | tun->dev->type); | |
48abfe05 | 3173 | ret = 0; |
ff4cc3ac | 3174 | } |
631ab46b | 3175 | break; |
ff4cc3ac | 3176 | |
1da177e4 LT |
3177 | #ifdef TUN_DEBUG |
3178 | case TUNSETDEBUG: | |
3179 | tun->debug = arg; | |
3180 | break; | |
3181 | #endif | |
5228ddc9 | 3182 | case TUNSETOFFLOAD: |
88255375 | 3183 | ret = set_offload(tun, arg); |
631ab46b | 3184 | break; |
5228ddc9 | 3185 | |
f271b2cc MK |
3186 | case TUNSETTXFILTER: |
3187 | /* Can be set only for TAPs */ | |
631ab46b | 3188 | ret = -EINVAL; |
40630b82 | 3189 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 3190 | break; |
c0e5a8c2 | 3191 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 3192 | break; |
1da177e4 LT |
3193 | |
3194 | case SIOCGIFHWADDR: | |
b595076a | 3195 | /* Get hw address */ |
f271b2cc MK |
3196 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
3197 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 3198 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
3199 | ret = -EFAULT; |
3200 | break; | |
1da177e4 LT |
3201 | |
3202 | case SIOCSIFHWADDR: | |
f271b2cc | 3203 | /* Set hw address */ |
6b8a66ee JP |
3204 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
3205 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 3206 | |
3a37a963 | 3207 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr, NULL); |
631ab46b | 3208 | break; |
33dccbb0 HX |
3209 | |
3210 | case TUNGETSNDBUF: | |
54f968d6 | 3211 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
3212 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
3213 | ret = -EFAULT; | |
3214 | break; | |
3215 | ||
3216 | case TUNSETSNDBUF: | |
3217 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
3218 | ret = -EFAULT; | |
3219 | break; | |
3220 | } | |
93161922 CG |
3221 | if (sndbuf <= 0) { |
3222 | ret = -EINVAL; | |
3223 | break; | |
3224 | } | |
33dccbb0 | 3225 | |
c8d68e6b JW |
3226 | tun->sndbuf = sndbuf; |
3227 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
3228 | break; |
3229 | ||
d9d52b51 MT |
3230 | case TUNGETVNETHDRSZ: |
3231 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
3232 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
3233 | ret = -EFAULT; | |
3234 | break; | |
3235 | ||
3236 | case TUNSETVNETHDRSZ: | |
3237 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
3238 | ret = -EFAULT; | |
3239 | break; | |
3240 | } | |
3241 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
3242 | ret = -EINVAL; | |
3243 | break; | |
3244 | } | |
3245 | ||
3246 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
3247 | break; | |
3248 | ||
1cf8e410 MT |
3249 | case TUNGETVNETLE: |
3250 | le = !!(tun->flags & TUN_VNET_LE); | |
3251 | if (put_user(le, (int __user *)argp)) | |
3252 | ret = -EFAULT; | |
3253 | break; | |
3254 | ||
3255 | case TUNSETVNETLE: | |
3256 | if (get_user(le, (int __user *)argp)) { | |
3257 | ret = -EFAULT; | |
3258 | break; | |
3259 | } | |
3260 | if (le) | |
3261 | tun->flags |= TUN_VNET_LE; | |
3262 | else | |
3263 | tun->flags &= ~TUN_VNET_LE; | |
3264 | break; | |
3265 | ||
8b8e658b GK |
3266 | case TUNGETVNETBE: |
3267 | ret = tun_get_vnet_be(tun, argp); | |
3268 | break; | |
3269 | ||
3270 | case TUNSETVNETBE: | |
3271 | ret = tun_set_vnet_be(tun, argp); | |
3272 | break; | |
3273 | ||
99405162 MT |
3274 | case TUNATTACHFILTER: |
3275 | /* Can be set only for TAPs */ | |
3276 | ret = -EINVAL; | |
40630b82 | 3277 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
3278 | break; |
3279 | ret = -EFAULT; | |
54f968d6 | 3280 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
3281 | break; |
3282 | ||
c8d68e6b | 3283 | ret = tun_attach_filter(tun); |
99405162 MT |
3284 | break; |
3285 | ||
3286 | case TUNDETACHFILTER: | |
3287 | /* Can be set only for TAPs */ | |
3288 | ret = -EINVAL; | |
40630b82 | 3289 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 3290 | break; |
c8d68e6b JW |
3291 | ret = 0; |
3292 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
3293 | break; |
3294 | ||
76975e9c PE |
3295 | case TUNGETFILTER: |
3296 | ret = -EINVAL; | |
40630b82 | 3297 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
3298 | break; |
3299 | ret = -EFAULT; | |
3300 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
3301 | break; | |
3302 | ret = 0; | |
3303 | break; | |
3304 | ||
96f84061 | 3305 | case TUNSETSTEERINGEBPF: |
cd5681d7 | 3306 | ret = tun_set_ebpf(tun, &tun->steering_prog, argp); |
96f84061 JW |
3307 | break; |
3308 | ||
aff3d70a JW |
3309 | case TUNSETFILTEREBPF: |
3310 | ret = tun_set_ebpf(tun, &tun->filter_prog, argp); | |
3311 | break; | |
3312 | ||
26d31925 ND |
3313 | case TUNSETCARRIER: |
3314 | ret = -EFAULT; | |
3315 | if (copy_from_user(&carrier, argp, sizeof(carrier))) | |
3316 | goto unlock; | |
3317 | ||
3318 | ret = tun_net_change_carrier(tun->dev, (bool)carrier); | |
3319 | break; | |
3320 | ||
0c3e0e3b KT |
3321 | case TUNGETDEVNETNS: |
3322 | ret = -EPERM; | |
3323 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
3324 | goto unlock; | |
3325 | ret = open_related_ns(&net->ns, get_net_ns); | |
3326 | break; | |
3327 | ||
1da177e4 | 3328 | default: |
631ab46b EB |
3329 | ret = -EINVAL; |
3330 | break; | |
ee289b64 | 3331 | } |
1da177e4 | 3332 | |
83c1f36f SD |
3333 | if (do_notify) |
3334 | netdev_state_change(tun->dev); | |
3335 | ||
876bfd4d HX |
3336 | unlock: |
3337 | rtnl_unlock(); | |
3338 | if (tun) | |
3339 | tun_put(tun); | |
631ab46b | 3340 | return ret; |
1da177e4 LT |
3341 | } |
3342 | ||
50857e2a AB |
3343 | static long tun_chr_ioctl(struct file *file, |
3344 | unsigned int cmd, unsigned long arg) | |
3345 | { | |
3346 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
3347 | } | |
3348 | ||
3349 | #ifdef CONFIG_COMPAT | |
3350 | static long tun_chr_compat_ioctl(struct file *file, | |
3351 | unsigned int cmd, unsigned long arg) | |
3352 | { | |
3353 | switch (cmd) { | |
3354 | case TUNSETIFF: | |
3355 | case TUNGETIFF: | |
3356 | case TUNSETTXFILTER: | |
3357 | case TUNGETSNDBUF: | |
3358 | case TUNSETSNDBUF: | |
3359 | case SIOCGIFHWADDR: | |
3360 | case SIOCSIFHWADDR: | |
3361 | arg = (unsigned long)compat_ptr(arg); | |
3362 | break; | |
3363 | default: | |
3364 | arg = (compat_ulong_t)arg; | |
3365 | break; | |
3366 | } | |
3367 | ||
3368 | /* | |
3369 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
3370 | * the end of that structure. All fields that are used in this | |
3371 | * driver are compatible though, we don't need to convert the | |
3372 | * contents. | |
3373 | */ | |
3374 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
3375 | } | |
3376 | #endif /* CONFIG_COMPAT */ | |
3377 | ||
1da177e4 LT |
3378 | static int tun_chr_fasync(int fd, struct file *file, int on) |
3379 | { | |
54f968d6 | 3380 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
3381 | int ret; |
3382 | ||
54f968d6 | 3383 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 3384 | goto out; |
6aa20a22 | 3385 | |
1da177e4 | 3386 | if (on) { |
01919134 | 3387 | __f_setown(file, task_pid(current), PIDTYPE_TGID, 0); |
54f968d6 | 3388 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 3389 | } else |
54f968d6 | 3390 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
3391 | ret = 0; |
3392 | out: | |
9d319522 | 3393 | return ret; |
1da177e4 LT |
3394 | } |
3395 | ||
3396 | static int tun_chr_open(struct inode *inode, struct file * file) | |
3397 | { | |
140e807d | 3398 | struct net *net = current->nsproxy->net_ns; |
631ab46b | 3399 | struct tun_file *tfile; |
deed49fb | 3400 | |
6b8a66ee | 3401 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 3402 | |
140e807d | 3403 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
11aa9c28 | 3404 | &tun_proto, 0); |
631ab46b EB |
3405 | if (!tfile) |
3406 | return -ENOMEM; | |
b196d88a JW |
3407 | if (ptr_ring_init(&tfile->tx_ring, 0, GFP_KERNEL)) { |
3408 | sk_free(&tfile->sk); | |
3409 | return -ENOMEM; | |
3410 | } | |
3411 | ||
c7256f57 | 3412 | mutex_init(&tfile->napi_mutex); |
c956674b | 3413 | RCU_INIT_POINTER(tfile->tun, NULL); |
54f968d6 | 3414 | tfile->flags = 0; |
fb7589a1 | 3415 | tfile->ifindex = 0; |
54f968d6 | 3416 | |
333f7909 | 3417 | init_waitqueue_head(&tfile->socket.wq.wait); |
54f968d6 JW |
3418 | |
3419 | tfile->socket.file = file; | |
3420 | tfile->socket.ops = &tun_socket_ops; | |
3421 | ||
3422 | sock_init_data(&tfile->socket, &tfile->sk); | |
54f968d6 JW |
3423 | |
3424 | tfile->sk.sk_write_space = tun_sock_write_space; | |
3425 | tfile->sk.sk_sndbuf = INT_MAX; | |
3426 | ||
631ab46b | 3427 | file->private_data = tfile; |
4008e97f | 3428 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 3429 | |
19a6afb2 JW |
3430 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
3431 | ||
1da177e4 LT |
3432 | return 0; |
3433 | } | |
3434 | ||
3435 | static int tun_chr_close(struct inode *inode, struct file *file) | |
3436 | { | |
631ab46b | 3437 | struct tun_file *tfile = file->private_data; |
1da177e4 | 3438 | |
c8d68e6b | 3439 | tun_detach(tfile, true); |
1da177e4 LT |
3440 | |
3441 | return 0; | |
3442 | } | |
3443 | ||
93e14b6d | 3444 | #ifdef CONFIG_PROC_FS |
9484dc74 | 3445 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *file) |
93e14b6d | 3446 | { |
9484dc74 | 3447 | struct tun_file *tfile = file->private_data; |
93e14b6d MY |
3448 | struct tun_struct *tun; |
3449 | struct ifreq ifr; | |
3450 | ||
3451 | memset(&ifr, 0, sizeof(ifr)); | |
3452 | ||
3453 | rtnl_lock(); | |
9484dc74 | 3454 | tun = tun_get(tfile); |
93e14b6d | 3455 | if (tun) |
12132768 | 3456 | tun_get_iff(tun, &ifr); |
93e14b6d MY |
3457 | rtnl_unlock(); |
3458 | ||
3459 | if (tun) | |
3460 | tun_put(tun); | |
3461 | ||
a3816ab0 | 3462 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
3463 | } |
3464 | #endif | |
3465 | ||
d54b1fdb | 3466 | static const struct file_operations tun_fops = { |
6aa20a22 | 3467 | .owner = THIS_MODULE, |
1da177e4 | 3468 | .llseek = no_llseek, |
9b067034 | 3469 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 3470 | .write_iter = tun_chr_write_iter, |
1da177e4 | 3471 | .poll = tun_chr_poll, |
50857e2a AB |
3472 | .unlocked_ioctl = tun_chr_ioctl, |
3473 | #ifdef CONFIG_COMPAT | |
3474 | .compat_ioctl = tun_chr_compat_ioctl, | |
3475 | #endif | |
1da177e4 LT |
3476 | .open = tun_chr_open, |
3477 | .release = tun_chr_close, | |
93e14b6d MY |
3478 | .fasync = tun_chr_fasync, |
3479 | #ifdef CONFIG_PROC_FS | |
3480 | .show_fdinfo = tun_chr_show_fdinfo, | |
3481 | #endif | |
1da177e4 LT |
3482 | }; |
3483 | ||
3484 | static struct miscdevice tun_miscdev = { | |
3485 | .minor = TUN_MINOR, | |
3486 | .name = "tun", | |
e454cea2 | 3487 | .nodename = "net/tun", |
1da177e4 | 3488 | .fops = &tun_fops, |
1da177e4 LT |
3489 | }; |
3490 | ||
3491 | /* ethtool interface */ | |
3492 | ||
4e24f2dd CW |
3493 | static void tun_default_link_ksettings(struct net_device *dev, |
3494 | struct ethtool_link_ksettings *cmd) | |
29ccc49d PR |
3495 | { |
3496 | ethtool_link_ksettings_zero_link_mode(cmd, supported); | |
3497 | ethtool_link_ksettings_zero_link_mode(cmd, advertising); | |
3498 | cmd->base.speed = SPEED_10; | |
3499 | cmd->base.duplex = DUPLEX_FULL; | |
3500 | cmd->base.port = PORT_TP; | |
3501 | cmd->base.phy_address = 0; | |
3502 | cmd->base.autoneg = AUTONEG_DISABLE; | |
4e24f2dd CW |
3503 | } |
3504 | ||
3505 | static int tun_get_link_ksettings(struct net_device *dev, | |
3506 | struct ethtool_link_ksettings *cmd) | |
3507 | { | |
3508 | struct tun_struct *tun = netdev_priv(dev); | |
3509 | ||
3510 | memcpy(cmd, &tun->link_ksettings, sizeof(*cmd)); | |
3511 | return 0; | |
3512 | } | |
3513 | ||
3514 | static int tun_set_link_ksettings(struct net_device *dev, | |
3515 | const struct ethtool_link_ksettings *cmd) | |
3516 | { | |
3517 | struct tun_struct *tun = netdev_priv(dev); | |
3518 | ||
3519 | memcpy(&tun->link_ksettings, cmd, sizeof(*cmd)); | |
1da177e4 LT |
3520 | return 0; |
3521 | } | |
3522 | ||
3523 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
3524 | { | |
3525 | struct tun_struct *tun = netdev_priv(dev); | |
3526 | ||
33a5ba14 RJ |
3527 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
3528 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
3529 | |
3530 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 3531 | case IFF_TUN: |
33a5ba14 | 3532 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 3533 | break; |
40630b82 | 3534 | case IFF_TAP: |
33a5ba14 | 3535 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
3536 | break; |
3537 | } | |
3538 | } | |
3539 | ||
3540 | static u32 tun_get_msglevel(struct net_device *dev) | |
3541 | { | |
3542 | #ifdef TUN_DEBUG | |
3543 | struct tun_struct *tun = netdev_priv(dev); | |
3544 | return tun->debug; | |
3545 | #else | |
3546 | return -EOPNOTSUPP; | |
3547 | #endif | |
3548 | } | |
3549 | ||
3550 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
3551 | { | |
3552 | #ifdef TUN_DEBUG | |
3553 | struct tun_struct *tun = netdev_priv(dev); | |
3554 | tun->debug = value; | |
3555 | #endif | |
3556 | } | |
3557 | ||
5503fcec JW |
3558 | static int tun_get_coalesce(struct net_device *dev, |
3559 | struct ethtool_coalesce *ec) | |
3560 | { | |
3561 | struct tun_struct *tun = netdev_priv(dev); | |
3562 | ||
3563 | ec->rx_max_coalesced_frames = tun->rx_batched; | |
3564 | ||
3565 | return 0; | |
3566 | } | |
3567 | ||
3568 | static int tun_set_coalesce(struct net_device *dev, | |
3569 | struct ethtool_coalesce *ec) | |
3570 | { | |
3571 | struct tun_struct *tun = netdev_priv(dev); | |
3572 | ||
3573 | if (ec->rx_max_coalesced_frames > NAPI_POLL_WEIGHT) | |
3574 | tun->rx_batched = NAPI_POLL_WEIGHT; | |
3575 | else | |
3576 | tun->rx_batched = ec->rx_max_coalesced_frames; | |
3577 | ||
3578 | return 0; | |
3579 | } | |
3580 | ||
7282d491 | 3581 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
3582 | .get_drvinfo = tun_get_drvinfo, |
3583 | .get_msglevel = tun_get_msglevel, | |
3584 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 3585 | .get_link = ethtool_op_get_link, |
eda29772 | 3586 | .get_ts_info = ethtool_op_get_ts_info, |
5503fcec JW |
3587 | .get_coalesce = tun_get_coalesce, |
3588 | .set_coalesce = tun_set_coalesce, | |
29ccc49d | 3589 | .get_link_ksettings = tun_get_link_ksettings, |
4e24f2dd | 3590 | .set_link_ksettings = tun_set_link_ksettings, |
1da177e4 LT |
3591 | }; |
3592 | ||
1576d986 JW |
3593 | static int tun_queue_resize(struct tun_struct *tun) |
3594 | { | |
3595 | struct net_device *dev = tun->dev; | |
3596 | struct tun_file *tfile; | |
5990a305 | 3597 | struct ptr_ring **rings; |
1576d986 JW |
3598 | int n = tun->numqueues + tun->numdisabled; |
3599 | int ret, i; | |
3600 | ||
5990a305 JW |
3601 | rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL); |
3602 | if (!rings) | |
1576d986 JW |
3603 | return -ENOMEM; |
3604 | ||
3605 | for (i = 0; i < tun->numqueues; i++) { | |
3606 | tfile = rtnl_dereference(tun->tfiles[i]); | |
5990a305 | 3607 | rings[i] = &tfile->tx_ring; |
1576d986 JW |
3608 | } |
3609 | list_for_each_entry(tfile, &tun->disabled, next) | |
5990a305 | 3610 | rings[i++] = &tfile->tx_ring; |
1576d986 | 3611 | |
5990a305 JW |
3612 | ret = ptr_ring_resize_multiple(rings, n, |
3613 | dev->tx_queue_len, GFP_KERNEL, | |
fc72d1d5 | 3614 | tun_ptr_free); |
1576d986 | 3615 | |
5990a305 | 3616 | kfree(rings); |
1576d986 JW |
3617 | return ret; |
3618 | } | |
3619 | ||
3620 | static int tun_device_event(struct notifier_block *unused, | |
3621 | unsigned long event, void *ptr) | |
3622 | { | |
3623 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3624 | struct tun_struct *tun = netdev_priv(dev); | |
72b319dc | 3625 | int i; |
1576d986 | 3626 | |
86dfb4ac CG |
3627 | if (dev->rtnl_link_ops != &tun_link_ops) |
3628 | return NOTIFY_DONE; | |
3629 | ||
1576d986 JW |
3630 | switch (event) { |
3631 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
3632 | if (tun_queue_resize(tun)) | |
3633 | return NOTIFY_BAD; | |
3634 | break; | |
72b319dc FL |
3635 | case NETDEV_UP: |
3636 | for (i = 0; i < tun->numqueues; i++) { | |
3637 | struct tun_file *tfile; | |
3638 | ||
3639 | tfile = rtnl_dereference(tun->tfiles[i]); | |
3640 | tfile->socket.sk->sk_write_space(tfile->socket.sk); | |
3641 | } | |
3642 | break; | |
1576d986 JW |
3643 | default: |
3644 | break; | |
3645 | } | |
3646 | ||
3647 | return NOTIFY_DONE; | |
3648 | } | |
3649 | ||
3650 | static struct notifier_block tun_notifier_block __read_mostly = { | |
3651 | .notifier_call = tun_device_event, | |
3652 | }; | |
79d17604 | 3653 | |
1da177e4 LT |
3654 | static int __init tun_init(void) |
3655 | { | |
3656 | int ret = 0; | |
3657 | ||
6b8a66ee | 3658 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1da177e4 | 3659 | |
f019a7a5 | 3660 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 3661 | if (ret) { |
6b8a66ee | 3662 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 3663 | goto err_linkops; |
79d17604 PE |
3664 | } |
3665 | ||
1da177e4 | 3666 | ret = misc_register(&tun_miscdev); |
79d17604 | 3667 | if (ret) { |
6b8a66ee | 3668 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
3669 | goto err_misc; |
3670 | } | |
1576d986 | 3671 | |
5edfbd3c TZ |
3672 | ret = register_netdevice_notifier(&tun_notifier_block); |
3673 | if (ret) { | |
3674 | pr_err("Can't register netdevice notifier\n"); | |
3675 | goto err_notifier; | |
3676 | } | |
3677 | ||
f019a7a5 | 3678 | return 0; |
5edfbd3c TZ |
3679 | |
3680 | err_notifier: | |
3681 | misc_deregister(&tun_miscdev); | |
79d17604 | 3682 | err_misc: |
f019a7a5 EB |
3683 | rtnl_link_unregister(&tun_link_ops); |
3684 | err_linkops: | |
1da177e4 LT |
3685 | return ret; |
3686 | } | |
3687 | ||
3688 | static void tun_cleanup(void) | |
3689 | { | |
6aa20a22 | 3690 | misc_deregister(&tun_miscdev); |
f019a7a5 | 3691 | rtnl_link_unregister(&tun_link_ops); |
1576d986 | 3692 | unregister_netdevice_notifier(&tun_notifier_block); |
1da177e4 LT |
3693 | } |
3694 | ||
05c2828c MT |
3695 | /* Get an underlying socket object from tun file. Returns error unless file is |
3696 | * attached to a device. The returned object works like a packet socket, it | |
3697 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
3698 | * holding a reference to the file for as long as the socket is in use. */ | |
3699 | struct socket *tun_get_socket(struct file *file) | |
3700 | { | |
6e914fc7 | 3701 | struct tun_file *tfile; |
05c2828c MT |
3702 | if (file->f_op != &tun_fops) |
3703 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
3704 | tfile = file->private_data; |
3705 | if (!tfile) | |
05c2828c | 3706 | return ERR_PTR(-EBADFD); |
54f968d6 | 3707 | return &tfile->socket; |
05c2828c MT |
3708 | } |
3709 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
3710 | ||
5990a305 | 3711 | struct ptr_ring *tun_get_tx_ring(struct file *file) |
83339c6b JW |
3712 | { |
3713 | struct tun_file *tfile; | |
3714 | ||
3715 | if (file->f_op != &tun_fops) | |
3716 | return ERR_PTR(-EINVAL); | |
3717 | tfile = file->private_data; | |
3718 | if (!tfile) | |
3719 | return ERR_PTR(-EBADFD); | |
5990a305 | 3720 | return &tfile->tx_ring; |
83339c6b | 3721 | } |
5990a305 | 3722 | EXPORT_SYMBOL_GPL(tun_get_tx_ring); |
83339c6b | 3723 | |
1da177e4 LT |
3724 | module_init(tun_init); |
3725 | module_exit(tun_cleanup); | |
3726 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
3727 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
3728 | MODULE_LICENSE("GPL"); | |
3729 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 3730 | MODULE_ALIAS("devname:net/tun"); |