Commit | Line | Data |
---|---|---|
20d29d7a AB |
1 | #include <linux/etherdevice.h> |
2 | #include <linux/if_macvlan.h> | |
f09e2249 | 3 | #include <linux/if_vlan.h> |
20d29d7a AB |
4 | #include <linux/interrupt.h> |
5 | #include <linux/nsproxy.h> | |
6 | #include <linux/compat.h> | |
7 | #include <linux/if_tun.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/skbuff.h> | |
10 | #include <linux/cache.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/types.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
20d29d7a AB |
14 | #include <linux/wait.h> |
15 | #include <linux/cdev.h> | |
40401530 | 16 | #include <linux/idr.h> |
20d29d7a AB |
17 | #include <linux/fs.h> |
18 | ||
19 | #include <net/net_namespace.h> | |
20 | #include <net/rtnetlink.h> | |
21 | #include <net/sock.h> | |
b9fb9ee0 | 22 | #include <linux/virtio_net.h> |
20d29d7a AB |
23 | |
24 | /* | |
25 | * A macvtap queue is the central object of this driver, it connects | |
26 | * an open character device to a macvlan interface. There can be | |
27 | * multiple queues on one interface, which map back to queues | |
28 | * implemented in hardware on the underlying device. | |
29 | * | |
30 | * macvtap_proto is used to allocate queues through the sock allocation | |
31 | * mechanism. | |
32 | * | |
20d29d7a AB |
33 | */ |
34 | struct macvtap_queue { | |
35 | struct sock sk; | |
36 | struct socket sock; | |
43815482 | 37 | struct socket_wq wq; |
55afbd08 | 38 | int vnet_hdr_sz; |
13707f9e | 39 | struct macvlan_dev __rcu *vlan; |
20d29d7a | 40 | struct file *file; |
b9fb9ee0 | 41 | unsigned int flags; |
376b1aab | 42 | u16 queue_index; |
815f236d JW |
43 | bool enabled; |
44 | struct list_head next; | |
20d29d7a AB |
45 | }; |
46 | ||
47 | static struct proto macvtap_proto = { | |
48 | .name = "macvtap", | |
49 | .owner = THIS_MODULE, | |
50 | .obj_size = sizeof (struct macvtap_queue), | |
51 | }; | |
52 | ||
53 | /* | |
e09eff7f | 54 | * Variables for dealing with macvtaps device numbers. |
20d29d7a | 55 | */ |
1ebed71a | 56 | static dev_t macvtap_major; |
e09eff7f EB |
57 | #define MACVTAP_NUM_DEVS (1U << MINORBITS) |
58 | static DEFINE_MUTEX(minor_lock); | |
59 | static DEFINE_IDR(minor_idr); | |
60 | ||
97bc3633 | 61 | #define GOODCOPY_LEN 128 |
20d29d7a AB |
62 | static struct class *macvtap_class; |
63 | static struct cdev macvtap_cdev; | |
64 | ||
501c774c AB |
65 | static const struct proto_ops macvtap_socket_ops; |
66 | ||
2be5c767 VY |
67 | #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ |
68 | NETIF_F_TSO6 | NETIF_F_UFO) | |
69 | #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO) | |
a567dd62 VY |
70 | #define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG) |
71 | ||
6acf54f1 VY |
72 | static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev) |
73 | { | |
74 | return rcu_dereference(dev->rx_handler_data); | |
75 | } | |
76 | ||
20d29d7a AB |
77 | /* |
78 | * RCU usage: | |
02df55d2 AB |
79 | * The macvtap_queue and the macvlan_dev are loosely coupled, the |
80 | * pointers from one to the other can only be read while rcu_read_lock | |
441ac0fc | 81 | * or rtnl is held. |
20d29d7a | 82 | * |
02df55d2 AB |
83 | * Both the file and the macvlan_dev hold a reference on the macvtap_queue |
84 | * through sock_hold(&q->sk). When the macvlan_dev goes away first, | |
85 | * q->vlan becomes inaccessible. When the files gets closed, | |
86 | * macvtap_get_queue() fails. | |
20d29d7a | 87 | * |
02df55d2 AB |
88 | * There may still be references to the struct sock inside of the |
89 | * queue from outbound SKBs, but these never reference back to the | |
90 | * file or the dev. The data structure is freed through __sk_free | |
91 | * when both our references and any pending SKBs are gone. | |
20d29d7a | 92 | */ |
20d29d7a | 93 | |
815f236d | 94 | static int macvtap_enable_queue(struct net_device *dev, struct file *file, |
20d29d7a | 95 | struct macvtap_queue *q) |
815f236d JW |
96 | { |
97 | struct macvlan_dev *vlan = netdev_priv(dev); | |
98 | int err = -EINVAL; | |
99 | ||
441ac0fc | 100 | ASSERT_RTNL(); |
815f236d JW |
101 | |
102 | if (q->enabled) | |
103 | goto out; | |
104 | ||
105 | err = 0; | |
106 | rcu_assign_pointer(vlan->taps[vlan->numvtaps], q); | |
107 | q->queue_index = vlan->numvtaps; | |
108 | q->enabled = true; | |
109 | ||
110 | vlan->numvtaps++; | |
111 | out: | |
815f236d JW |
112 | return err; |
113 | } | |
114 | ||
115 | static int macvtap_set_queue(struct net_device *dev, struct file *file, | |
116 | struct macvtap_queue *q) | |
20d29d7a AB |
117 | { |
118 | struct macvlan_dev *vlan = netdev_priv(dev); | |
119 | int err = -EBUSY; | |
120 | ||
441ac0fc | 121 | rtnl_lock(); |
815f236d | 122 | if (vlan->numqueues == MAX_MACVTAP_QUEUES) |
20d29d7a AB |
123 | goto out; |
124 | ||
125 | err = 0; | |
02df55d2 | 126 | rcu_assign_pointer(q->vlan, vlan); |
376b1aab | 127 | rcu_assign_pointer(vlan->taps[vlan->numvtaps], q); |
02df55d2 | 128 | sock_hold(&q->sk); |
20d29d7a AB |
129 | |
130 | q->file = file; | |
376b1aab | 131 | q->queue_index = vlan->numvtaps; |
815f236d | 132 | q->enabled = true; |
02df55d2 | 133 | file->private_data = q; |
815f236d | 134 | list_add_tail(&q->next, &vlan->queue_list); |
20d29d7a | 135 | |
1565c7c1 | 136 | vlan->numvtaps++; |
815f236d | 137 | vlan->numqueues++; |
1565c7c1 | 138 | |
20d29d7a | 139 | out: |
441ac0fc | 140 | rtnl_unlock(); |
20d29d7a AB |
141 | return err; |
142 | } | |
143 | ||
441ac0fc | 144 | static int macvtap_disable_queue(struct macvtap_queue *q) |
815f236d JW |
145 | { |
146 | struct macvlan_dev *vlan; | |
147 | struct macvtap_queue *nq; | |
148 | ||
441ac0fc | 149 | ASSERT_RTNL(); |
815f236d JW |
150 | if (!q->enabled) |
151 | return -EINVAL; | |
152 | ||
441ac0fc VY |
153 | vlan = rtnl_dereference(q->vlan); |
154 | ||
815f236d JW |
155 | if (vlan) { |
156 | int index = q->queue_index; | |
157 | BUG_ON(index >= vlan->numvtaps); | |
441ac0fc | 158 | nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]); |
815f236d JW |
159 | nq->queue_index = index; |
160 | ||
161 | rcu_assign_pointer(vlan->taps[index], nq); | |
162 | RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL); | |
163 | q->enabled = false; | |
164 | ||
165 | vlan->numvtaps--; | |
166 | } | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
20d29d7a | 171 | /* |
02df55d2 AB |
172 | * The file owning the queue got closed, give up both |
173 | * the reference that the files holds as well as the | |
174 | * one from the macvlan_dev if that still exists. | |
20d29d7a AB |
175 | * |
176 | * Using the spinlock makes sure that we don't get | |
177 | * to the queue again after destroying it. | |
20d29d7a | 178 | */ |
02df55d2 | 179 | static void macvtap_put_queue(struct macvtap_queue *q) |
20d29d7a | 180 | { |
02df55d2 | 181 | struct macvlan_dev *vlan; |
20d29d7a | 182 | |
441ac0fc VY |
183 | rtnl_lock(); |
184 | vlan = rtnl_dereference(q->vlan); | |
185 | ||
02df55d2 | 186 | if (vlan) { |
815f236d | 187 | if (q->enabled) |
441ac0fc | 188 | BUG_ON(macvtap_disable_queue(q)); |
376b1aab | 189 | |
815f236d | 190 | vlan->numqueues--; |
2cfa5a04 | 191 | RCU_INIT_POINTER(q->vlan, NULL); |
02df55d2 | 192 | sock_put(&q->sk); |
815f236d | 193 | list_del_init(&q->next); |
20d29d7a AB |
194 | } |
195 | ||
441ac0fc | 196 | rtnl_unlock(); |
20d29d7a AB |
197 | |
198 | synchronize_rcu(); | |
199 | sock_put(&q->sk); | |
200 | } | |
201 | ||
202 | /* | |
1565c7c1 KK |
203 | * Select a queue based on the rxq of the device on which this packet |
204 | * arrived. If the incoming device is not mq, calculate a flow hash | |
205 | * to select a queue. If all fails, find the first available queue. | |
206 | * Cache vlan->numvtaps since it can become zero during the execution | |
207 | * of this function. | |
20d29d7a AB |
208 | */ |
209 | static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, | |
210 | struct sk_buff *skb) | |
211 | { | |
212 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 | 213 | struct macvtap_queue *tap = NULL; |
815f236d JW |
214 | /* Access to taps array is protected by rcu, but access to numvtaps |
215 | * isn't. Below we use it to lookup a queue, but treat it as a hint | |
216 | * and validate that the result isn't NULL - in case we are | |
217 | * racing against queue removal. | |
218 | */ | |
ed0483fa | 219 | int numvtaps = ACCESS_ONCE(vlan->numvtaps); |
1565c7c1 KK |
220 | __u32 rxq; |
221 | ||
222 | if (!numvtaps) | |
223 | goto out; | |
224 | ||
ef0002b5 | 225 | /* Check if we can use flow to select a queue */ |
3958afa1 | 226 | rxq = skb_get_hash(skb); |
ef0002b5 KK |
227 | if (rxq) { |
228 | tap = rcu_dereference(vlan->taps[rxq % numvtaps]); | |
376b1aab | 229 | goto out; |
ef0002b5 KK |
230 | } |
231 | ||
1565c7c1 KK |
232 | if (likely(skb_rx_queue_recorded(skb))) { |
233 | rxq = skb_get_rx_queue(skb); | |
20d29d7a | 234 | |
1565c7c1 KK |
235 | while (unlikely(rxq >= numvtaps)) |
236 | rxq -= numvtaps; | |
237 | ||
238 | tap = rcu_dereference(vlan->taps[rxq]); | |
376b1aab | 239 | goto out; |
1565c7c1 KK |
240 | } |
241 | ||
376b1aab | 242 | tap = rcu_dereference(vlan->taps[0]); |
1565c7c1 KK |
243 | out: |
244 | return tap; | |
20d29d7a AB |
245 | } |
246 | ||
02df55d2 AB |
247 | /* |
248 | * The net_device is going away, give up the reference | |
1565c7c1 KK |
249 | * that it holds on all queues and safely set the pointer |
250 | * from the queues to NULL. | |
02df55d2 | 251 | */ |
20d29d7a AB |
252 | static void macvtap_del_queues(struct net_device *dev) |
253 | { | |
254 | struct macvlan_dev *vlan = netdev_priv(dev); | |
815f236d | 255 | struct macvtap_queue *q, *tmp, *qlist[MAX_MACVTAP_QUEUES]; |
1565c7c1 | 256 | int i, j = 0; |
02df55d2 | 257 | |
441ac0fc | 258 | ASSERT_RTNL(); |
815f236d JW |
259 | list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) { |
260 | list_del_init(&q->next); | |
376b1aab | 261 | qlist[j++] = q; |
376b1aab | 262 | RCU_INIT_POINTER(q->vlan, NULL); |
815f236d JW |
263 | if (q->enabled) |
264 | vlan->numvtaps--; | |
265 | vlan->numqueues--; | |
564517e8 | 266 | } |
815f236d JW |
267 | for (i = 0; i < vlan->numvtaps; i++) |
268 | RCU_INIT_POINTER(vlan->taps[i], NULL); | |
269 | BUG_ON(vlan->numvtaps); | |
270 | BUG_ON(vlan->numqueues); | |
99f34b38 EB |
271 | /* guarantee that any future macvtap_set_queue will fail */ |
272 | vlan->numvtaps = MAX_MACVTAP_QUEUES; | |
1565c7c1 KK |
273 | |
274 | for (--j; j >= 0; j--) | |
275 | sock_put(&qlist[j]->sk); | |
20d29d7a AB |
276 | } |
277 | ||
6acf54f1 | 278 | static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb) |
20d29d7a | 279 | { |
6acf54f1 VY |
280 | struct sk_buff *skb = *pskb; |
281 | struct net_device *dev = skb->dev; | |
282 | struct macvlan_dev *vlan; | |
283 | struct macvtap_queue *q; | |
a567dd62 VY |
284 | netdev_features_t features = TAP_FEATURES; |
285 | ||
6acf54f1 VY |
286 | vlan = macvtap_get_vlan_rcu(dev); |
287 | if (!vlan) | |
288 | return RX_HANDLER_PASS; | |
289 | ||
290 | q = macvtap_get_queue(dev, skb); | |
20d29d7a | 291 | if (!q) |
6acf54f1 | 292 | return RX_HANDLER_PASS; |
8a35747a HX |
293 | |
294 | if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len) | |
295 | goto drop; | |
20d29d7a | 296 | |
6acf54f1 VY |
297 | skb_push(skb, ETH_HLEN); |
298 | ||
3e4f8b78 | 299 | /* Apply the forward feature mask so that we perform segmentation |
e5733321 VY |
300 | * according to users wishes. This only works if VNET_HDR is |
301 | * enabled. | |
3e4f8b78 | 302 | */ |
e5733321 VY |
303 | if (q->flags & IFF_VNET_HDR) |
304 | features |= vlan->tap_features; | |
3e4f8b78 VY |
305 | if (netif_needs_gso(skb, features)) { |
306 | struct sk_buff *segs = __skb_gso_segment(skb, features, false); | |
307 | ||
308 | if (IS_ERR(segs)) | |
309 | goto drop; | |
310 | ||
311 | if (!segs) { | |
312 | skb_queue_tail(&q->sk.sk_receive_queue, skb); | |
313 | goto wake_up; | |
314 | } | |
315 | ||
316 | kfree_skb(skb); | |
317 | while (segs) { | |
318 | struct sk_buff *nskb = segs->next; | |
319 | ||
320 | segs->next = NULL; | |
321 | skb_queue_tail(&q->sk.sk_receive_queue, segs); | |
322 | segs = nskb; | |
323 | } | |
324 | } else { | |
325 | skb_queue_tail(&q->sk.sk_receive_queue, skb); | |
326 | } | |
327 | ||
328 | wake_up: | |
4a4771a5 | 329 | wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND); |
6acf54f1 | 330 | return RX_HANDLER_CONSUMED; |
8a35747a HX |
331 | |
332 | drop: | |
6acf54f1 VY |
333 | /* Count errors/drops only here, thus don't care about args. */ |
334 | macvlan_count_rx(vlan, 0, 0, 0); | |
8a35747a | 335 | kfree_skb(skb); |
6acf54f1 | 336 | return RX_HANDLER_CONSUMED; |
20d29d7a AB |
337 | } |
338 | ||
e09eff7f EB |
339 | static int macvtap_get_minor(struct macvlan_dev *vlan) |
340 | { | |
341 | int retval = -ENOMEM; | |
e09eff7f EB |
342 | |
343 | mutex_lock(&minor_lock); | |
ec09ebc1 TH |
344 | retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL); |
345 | if (retval >= 0) { | |
346 | vlan->minor = retval; | |
347 | } else if (retval == -ENOSPC) { | |
e09eff7f EB |
348 | printk(KERN_ERR "too many macvtap devices\n"); |
349 | retval = -EINVAL; | |
e09eff7f | 350 | } |
e09eff7f | 351 | mutex_unlock(&minor_lock); |
ec09ebc1 | 352 | return retval < 0 ? retval : 0; |
e09eff7f EB |
353 | } |
354 | ||
355 | static void macvtap_free_minor(struct macvlan_dev *vlan) | |
356 | { | |
357 | mutex_lock(&minor_lock); | |
358 | if (vlan->minor) { | |
359 | idr_remove(&minor_idr, vlan->minor); | |
360 | vlan->minor = 0; | |
361 | } | |
362 | mutex_unlock(&minor_lock); | |
363 | } | |
364 | ||
365 | static struct net_device *dev_get_by_macvtap_minor(int minor) | |
366 | { | |
367 | struct net_device *dev = NULL; | |
368 | struct macvlan_dev *vlan; | |
369 | ||
370 | mutex_lock(&minor_lock); | |
371 | vlan = idr_find(&minor_idr, minor); | |
372 | if (vlan) { | |
373 | dev = vlan->dev; | |
374 | dev_hold(dev); | |
375 | } | |
376 | mutex_unlock(&minor_lock); | |
377 | return dev; | |
378 | } | |
379 | ||
20d29d7a AB |
380 | static int macvtap_newlink(struct net *src_net, |
381 | struct net_device *dev, | |
382 | struct nlattr *tb[], | |
383 | struct nlattr *data[]) | |
384 | { | |
815f236d | 385 | struct macvlan_dev *vlan = netdev_priv(dev); |
6acf54f1 VY |
386 | int err; |
387 | ||
815f236d JW |
388 | INIT_LIST_HEAD(&vlan->queue_list); |
389 | ||
2be5c767 VY |
390 | /* Since macvlan supports all offloads by default, make |
391 | * tap support all offloads also. | |
392 | */ | |
393 | vlan->tap_features = TUN_OFFLOADS; | |
394 | ||
6acf54f1 VY |
395 | err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan); |
396 | if (err) | |
397 | return err; | |
398 | ||
9bf1907f EB |
399 | /* Don't put anything that may fail after macvlan_common_newlink |
400 | * because we can't undo what it does. | |
401 | */ | |
2f6a1b66 | 402 | return macvlan_common_newlink(src_net, dev, tb, data); |
20d29d7a AB |
403 | } |
404 | ||
405 | static void macvtap_dellink(struct net_device *dev, | |
406 | struct list_head *head) | |
407 | { | |
6acf54f1 | 408 | netdev_rx_handler_unregister(dev); |
20d29d7a AB |
409 | macvtap_del_queues(dev); |
410 | macvlan_dellink(dev, head); | |
411 | } | |
412 | ||
8a35747a HX |
413 | static void macvtap_setup(struct net_device *dev) |
414 | { | |
415 | macvlan_common_setup(dev); | |
416 | dev->tx_queue_len = TUN_READQ_SIZE; | |
417 | } | |
418 | ||
20d29d7a AB |
419 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { |
420 | .kind = "macvtap", | |
8a35747a | 421 | .setup = macvtap_setup, |
20d29d7a AB |
422 | .newlink = macvtap_newlink, |
423 | .dellink = macvtap_dellink, | |
424 | }; | |
425 | ||
426 | ||
427 | static void macvtap_sock_write_space(struct sock *sk) | |
428 | { | |
43815482 ED |
429 | wait_queue_head_t *wqueue; |
430 | ||
20d29d7a AB |
431 | if (!sock_writeable(sk) || |
432 | !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
433 | return; | |
434 | ||
43815482 ED |
435 | wqueue = sk_sleep(sk); |
436 | if (wqueue && waitqueue_active(wqueue)) | |
437 | wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND); | |
20d29d7a AB |
438 | } |
439 | ||
2259fef0 EB |
440 | static void macvtap_sock_destruct(struct sock *sk) |
441 | { | |
442 | skb_queue_purge(&sk->sk_receive_queue); | |
443 | } | |
444 | ||
20d29d7a AB |
445 | static int macvtap_open(struct inode *inode, struct file *file) |
446 | { | |
447 | struct net *net = current->nsproxy->net_ns; | |
e09eff7f | 448 | struct net_device *dev = dev_get_by_macvtap_minor(iminor(inode)); |
20d29d7a AB |
449 | struct macvtap_queue *q; |
450 | int err; | |
451 | ||
452 | err = -ENODEV; | |
453 | if (!dev) | |
454 | goto out; | |
455 | ||
20d29d7a AB |
456 | err = -ENOMEM; |
457 | q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, | |
458 | &macvtap_proto); | |
459 | if (!q) | |
460 | goto out; | |
461 | ||
d9a90a31 | 462 | RCU_INIT_POINTER(q->sock.wq, &q->wq); |
43815482 | 463 | init_waitqueue_head(&q->wq.wait); |
20d29d7a AB |
464 | q->sock.type = SOCK_RAW; |
465 | q->sock.state = SS_CONNECTED; | |
501c774c AB |
466 | q->sock.file = file; |
467 | q->sock.ops = &macvtap_socket_ops; | |
20d29d7a | 468 | sock_init_data(&q->sock, &q->sk); |
20d29d7a | 469 | q->sk.sk_write_space = macvtap_sock_write_space; |
2259fef0 | 470 | q->sk.sk_destruct = macvtap_sock_destruct; |
b9fb9ee0 | 471 | q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; |
55afbd08 | 472 | q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
20d29d7a | 473 | |
97bc3633 SM |
474 | /* |
475 | * so far only KVM virtio_net uses macvtap, enable zero copy between | |
476 | * guest kernel and host kernel when lower device supports zerocopy | |
047af9cf EB |
477 | * |
478 | * The macvlan supports zerocopy iff the lower device supports zero | |
479 | * copy so we don't have to look at the lower device directly. | |
97bc3633 | 480 | */ |
047af9cf EB |
481 | if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG)) |
482 | sock_set_flag(&q->sk, SOCK_ZEROCOPY); | |
97bc3633 | 483 | |
20d29d7a AB |
484 | err = macvtap_set_queue(dev, file, q); |
485 | if (err) | |
486 | sock_put(&q->sk); | |
487 | ||
488 | out: | |
489 | if (dev) | |
490 | dev_put(dev); | |
491 | ||
492 | return err; | |
493 | } | |
494 | ||
495 | static int macvtap_release(struct inode *inode, struct file *file) | |
496 | { | |
02df55d2 AB |
497 | struct macvtap_queue *q = file->private_data; |
498 | macvtap_put_queue(q); | |
20d29d7a AB |
499 | return 0; |
500 | } | |
501 | ||
502 | static unsigned int macvtap_poll(struct file *file, poll_table * wait) | |
503 | { | |
02df55d2 | 504 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
505 | unsigned int mask = POLLERR; |
506 | ||
507 | if (!q) | |
508 | goto out; | |
509 | ||
510 | mask = 0; | |
43815482 | 511 | poll_wait(file, &q->wq.wait, wait); |
20d29d7a AB |
512 | |
513 | if (!skb_queue_empty(&q->sk.sk_receive_queue)) | |
514 | mask |= POLLIN | POLLRDNORM; | |
515 | ||
516 | if (sock_writeable(&q->sk) || | |
517 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) && | |
518 | sock_writeable(&q->sk))) | |
519 | mask |= POLLOUT | POLLWRNORM; | |
520 | ||
521 | out: | |
20d29d7a AB |
522 | return mask; |
523 | } | |
524 | ||
b9fb9ee0 AB |
525 | static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, |
526 | size_t len, size_t linear, | |
527 | int noblock, int *err) | |
528 | { | |
529 | struct sk_buff *skb; | |
530 | ||
531 | /* Under a page? Don't bother with paged skb. */ | |
532 | if (prepad + len < PAGE_SIZE || !linear) | |
533 | linear = len; | |
534 | ||
535 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
28d64271 | 536 | err, 0); |
b9fb9ee0 AB |
537 | if (!skb) |
538 | return NULL; | |
539 | ||
540 | skb_reserve(skb, prepad); | |
541 | skb_put(skb, linear); | |
542 | skb->data_len = len - linear; | |
543 | skb->len += len - linear; | |
544 | ||
545 | return skb; | |
546 | } | |
547 | ||
548 | /* | |
549 | * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should | |
550 | * be shared with the tun/tap driver. | |
551 | */ | |
552 | static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, | |
553 | struct virtio_net_hdr *vnet_hdr) | |
554 | { | |
555 | unsigned short gso_type = 0; | |
556 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
557 | switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
558 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
559 | gso_type = SKB_GSO_TCPV4; | |
560 | break; | |
561 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
562 | gso_type = SKB_GSO_TCPV6; | |
563 | break; | |
564 | case VIRTIO_NET_HDR_GSO_UDP: | |
565 | gso_type = SKB_GSO_UDP; | |
566 | break; | |
567 | default: | |
568 | return -EINVAL; | |
569 | } | |
570 | ||
571 | if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
572 | gso_type |= SKB_GSO_TCP_ECN; | |
573 | ||
574 | if (vnet_hdr->gso_size == 0) | |
575 | return -EINVAL; | |
576 | } | |
577 | ||
578 | if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
579 | if (!skb_partial_csum_set(skb, vnet_hdr->csum_start, | |
580 | vnet_hdr->csum_offset)) | |
581 | return -EINVAL; | |
582 | } | |
583 | ||
584 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
585 | skb_shinfo(skb)->gso_size = vnet_hdr->gso_size; | |
c9af6db4 | 586 | skb_shinfo(skb)->gso_type = gso_type; |
b9fb9ee0 AB |
587 | |
588 | /* Header must be checked, and gso_segs computed. */ | |
589 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
590 | skb_shinfo(skb)->gso_segs = 0; | |
591 | } | |
592 | return 0; | |
593 | } | |
594 | ||
359d44d7 | 595 | static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, |
b9fb9ee0 AB |
596 | struct virtio_net_hdr *vnet_hdr) |
597 | { | |
598 | memset(vnet_hdr, 0, sizeof(*vnet_hdr)); | |
599 | ||
600 | if (skb_is_gso(skb)) { | |
601 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
602 | ||
603 | /* This is a hint as to how much should be linear. */ | |
604 | vnet_hdr->hdr_len = skb_headlen(skb); | |
605 | vnet_hdr->gso_size = sinfo->gso_size; | |
606 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
607 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
608 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
609 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
610 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
611 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
612 | else | |
613 | BUG(); | |
614 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
615 | vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
616 | } else | |
617 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
618 | ||
619 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
620 | vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 621 | vnet_hdr->csum_start = skb_checksum_start_offset(skb); |
b9fb9ee0 | 622 | vnet_hdr->csum_offset = skb->csum_offset; |
10a8d94a JW |
623 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
624 | vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
b9fb9ee0 | 625 | } /* else everything is zero */ |
b9fb9ee0 AB |
626 | } |
627 | ||
20d29d7a | 628 | /* Get packet from user space buffer */ |
97bc3633 SM |
629 | static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, |
630 | const struct iovec *iv, unsigned long total_len, | |
631 | size_t count, int noblock) | |
20d29d7a | 632 | { |
16a3fa28 | 633 | int good_linear = SKB_MAX_HEAD(NET_IP_ALIGN); |
20d29d7a | 634 | struct sk_buff *skb; |
02df55d2 | 635 | struct macvlan_dev *vlan; |
97bc3633 | 636 | unsigned long len = total_len; |
20d29d7a | 637 | int err; |
b9fb9ee0 AB |
638 | struct virtio_net_hdr vnet_hdr = { 0 }; |
639 | int vnet_hdr_len = 0; | |
b92946e2 | 640 | int copylen = 0; |
97bc3633 | 641 | bool zerocopy = false; |
61d46bf9 | 642 | size_t linear; |
b9fb9ee0 AB |
643 | |
644 | if (q->flags & IFF_VNET_HDR) { | |
55afbd08 | 645 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
646 | |
647 | err = -EINVAL; | |
ce3c8692 | 648 | if (len < vnet_hdr_len) |
b9fb9ee0 | 649 | goto err; |
ce3c8692 | 650 | len -= vnet_hdr_len; |
b9fb9ee0 AB |
651 | |
652 | err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0, | |
55afbd08 | 653 | sizeof(vnet_hdr)); |
b9fb9ee0 AB |
654 | if (err < 0) |
655 | goto err; | |
656 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
657 | vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
658 | vnet_hdr.hdr_len) | |
659 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
660 | vnet_hdr.csum_offset + 2; | |
661 | err = -EINVAL; | |
662 | if (vnet_hdr.hdr_len > len) | |
663 | goto err; | |
664 | } | |
20d29d7a | 665 | |
b9fb9ee0 | 666 | err = -EINVAL; |
20d29d7a | 667 | if (unlikely(len < ETH_HLEN)) |
b9fb9ee0 | 668 | goto err; |
20d29d7a | 669 | |
b92946e2 JW |
670 | err = -EMSGSIZE; |
671 | if (unlikely(count > UIO_MAXIOV)) | |
672 | goto err; | |
673 | ||
ece793fc JW |
674 | if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) { |
675 | copylen = vnet_hdr.hdr_len ? vnet_hdr.hdr_len : GOODCOPY_LEN; | |
16a3fa28 JW |
676 | if (copylen > good_linear) |
677 | copylen = good_linear; | |
61d46bf9 | 678 | linear = copylen; |
ece793fc JW |
679 | if (iov_pages(iv, vnet_hdr_len + copylen, count) |
680 | <= MAX_SKB_FRAGS) | |
681 | zerocopy = true; | |
682 | } | |
683 | ||
684 | if (!zerocopy) { | |
97bc3633 | 685 | copylen = len; |
16a3fa28 JW |
686 | if (vnet_hdr.hdr_len > good_linear) |
687 | linear = good_linear; | |
688 | else | |
689 | linear = vnet_hdr.hdr_len; | |
61d46bf9 | 690 | } |
97bc3633 SM |
691 | |
692 | skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen, | |
61d46bf9 | 693 | linear, noblock, &err); |
02df55d2 AB |
694 | if (!skb) |
695 | goto err; | |
20d29d7a | 696 | |
01d6657b | 697 | if (zerocopy) |
97bc3633 | 698 | err = zerocopy_sg_from_iovec(skb, iv, vnet_hdr_len, count); |
ece793fc | 699 | else { |
97bc3633 SM |
700 | err = skb_copy_datagram_from_iovec(skb, 0, iv, vnet_hdr_len, |
701 | len); | |
ece793fc JW |
702 | if (!err && m && m->msg_control) { |
703 | struct ubuf_info *uarg = m->msg_control; | |
704 | uarg->callback(uarg, false); | |
705 | } | |
706 | } | |
707 | ||
02df55d2 | 708 | if (err) |
b9fb9ee0 | 709 | goto err_kfree; |
20d29d7a AB |
710 | |
711 | skb_set_network_header(skb, ETH_HLEN); | |
b9fb9ee0 AB |
712 | skb_reset_mac_header(skb); |
713 | skb->protocol = eth_hdr(skb)->h_proto; | |
714 | ||
715 | if (vnet_hdr_len) { | |
716 | err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr); | |
717 | if (err) | |
718 | goto err_kfree; | |
719 | } | |
720 | ||
40893fd0 | 721 | skb_probe_transport_header(skb, ETH_HLEN); |
9b4d669b | 722 | |
ac4e4af1 VY |
723 | rcu_read_lock(); |
724 | vlan = rcu_dereference(q->vlan); | |
97bc3633 | 725 | /* copy skb_ubuf_info for callback when skb has no error */ |
01d6657b | 726 | if (zerocopy) { |
97bc3633 | 727 | skb_shinfo(skb)->destructor_arg = m->msg_control; |
01d6657b | 728 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; |
c9af6db4 | 729 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
01d6657b | 730 | } |
29d79196 | 731 | if (vlan) { |
6acf54f1 VY |
732 | skb->dev = vlan->dev; |
733 | dev_queue_xmit(skb); | |
29d79196 | 734 | } else { |
02df55d2 | 735 | kfree_skb(skb); |
29d79196 | 736 | } |
ac4e4af1 | 737 | rcu_read_unlock(); |
20d29d7a | 738 | |
97bc3633 | 739 | return total_len; |
02df55d2 | 740 | |
b9fb9ee0 AB |
741 | err_kfree: |
742 | kfree_skb(skb); | |
743 | ||
02df55d2 | 744 | err: |
ac4e4af1 VY |
745 | rcu_read_lock(); |
746 | vlan = rcu_dereference(q->vlan); | |
02df55d2 | 747 | if (vlan) |
cd3e22b7 | 748 | this_cpu_inc(vlan->pcpu_stats->tx_dropped); |
ac4e4af1 | 749 | rcu_read_unlock(); |
02df55d2 | 750 | |
02df55d2 | 751 | return err; |
20d29d7a AB |
752 | } |
753 | ||
754 | static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv, | |
755 | unsigned long count, loff_t pos) | |
756 | { | |
757 | struct file *file = iocb->ki_filp; | |
758 | ssize_t result = -ENOLINK; | |
02df55d2 | 759 | struct macvtap_queue *q = file->private_data; |
20d29d7a | 760 | |
97bc3633 SM |
761 | result = macvtap_get_user(q, NULL, iv, iov_length(iv, count), count, |
762 | file->f_flags & O_NONBLOCK); | |
20d29d7a AB |
763 | return result; |
764 | } | |
765 | ||
766 | /* Put packet to the user space buffer */ | |
767 | static ssize_t macvtap_put_user(struct macvtap_queue *q, | |
768 | const struct sk_buff *skb, | |
769 | const struct iovec *iv, int len) | |
770 | { | |
20d29d7a | 771 | int ret; |
b9fb9ee0 | 772 | int vnet_hdr_len = 0; |
f09e2249 | 773 | int vlan_offset = 0; |
ce232ce0 | 774 | int copied, total; |
b9fb9ee0 AB |
775 | |
776 | if (q->flags & IFF_VNET_HDR) { | |
777 | struct virtio_net_hdr vnet_hdr; | |
55afbd08 | 778 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
779 | if ((len -= vnet_hdr_len) < 0) |
780 | return -EINVAL; | |
781 | ||
359d44d7 | 782 | macvtap_skb_to_vnet_hdr(skb, &vnet_hdr); |
b9fb9ee0 | 783 | |
55afbd08 | 784 | if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr))) |
b9fb9ee0 AB |
785 | return -EFAULT; |
786 | } | |
ce232ce0 JW |
787 | total = copied = vnet_hdr_len; |
788 | total += skb->len; | |
f09e2249 BG |
789 | |
790 | if (!vlan_tx_tag_present(skb)) | |
791 | len = min_t(int, skb->len, len); | |
792 | else { | |
793 | int copy; | |
794 | struct { | |
795 | __be16 h_vlan_proto; | |
796 | __be16 h_vlan_TCI; | |
797 | } veth; | |
0fbe0d47 | 798 | veth.h_vlan_proto = skb->vlan_proto; |
f09e2249 BG |
799 | veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb)); |
800 | ||
801 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
802 | len = min_t(int, skb->len + VLAN_HLEN, len); | |
ce232ce0 | 803 | total += VLAN_HLEN; |
f09e2249 BG |
804 | |
805 | copy = min_t(int, vlan_offset, len); | |
806 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy); | |
807 | len -= copy; | |
808 | copied += copy; | |
809 | if (ret || !len) | |
810 | goto done; | |
811 | ||
812 | copy = min_t(int, sizeof(veth), len); | |
813 | ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy); | |
814 | len -= copy; | |
815 | copied += copy; | |
816 | if (ret || !len) | |
817 | goto done; | |
818 | } | |
20d29d7a | 819 | |
f09e2249 | 820 | ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); |
20d29d7a | 821 | |
f09e2249 | 822 | done: |
ce232ce0 | 823 | return ret ? ret : total; |
20d29d7a AB |
824 | } |
825 | ||
55ec8e25 | 826 | static ssize_t macvtap_do_read(struct macvtap_queue *q, |
501c774c AB |
827 | const struct iovec *iv, unsigned long len, |
828 | int noblock) | |
20d29d7a | 829 | { |
ccf7e72b | 830 | DEFINE_WAIT(wait); |
20d29d7a | 831 | struct sk_buff *skb; |
501c774c | 832 | ssize_t ret = 0; |
20d29d7a | 833 | |
20d29d7a | 834 | while (len) { |
89cee917 JW |
835 | if (!noblock) |
836 | prepare_to_wait(sk_sleep(&q->sk), &wait, | |
837 | TASK_INTERRUPTIBLE); | |
20d29d7a AB |
838 | |
839 | /* Read frames from the queue */ | |
840 | skb = skb_dequeue(&q->sk.sk_receive_queue); | |
841 | if (!skb) { | |
501c774c | 842 | if (noblock) { |
20d29d7a AB |
843 | ret = -EAGAIN; |
844 | break; | |
845 | } | |
846 | if (signal_pending(current)) { | |
847 | ret = -ERESTARTSYS; | |
848 | break; | |
849 | } | |
850 | /* Nothing to read, let's sleep */ | |
851 | schedule(); | |
852 | continue; | |
853 | } | |
854 | ret = macvtap_put_user(q, skb, iv, len); | |
855 | kfree_skb(skb); | |
856 | break; | |
857 | } | |
858 | ||
89cee917 JW |
859 | if (!noblock) |
860 | finish_wait(sk_sleep(&q->sk), &wait); | |
501c774c AB |
861 | return ret; |
862 | } | |
863 | ||
864 | static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
865 | unsigned long count, loff_t pos) | |
866 | { | |
867 | struct file *file = iocb->ki_filp; | |
868 | struct macvtap_queue *q = file->private_data; | |
869 | ssize_t len, ret = 0; | |
20d29d7a | 870 | |
501c774c AB |
871 | len = iov_length(iv, count); |
872 | if (len < 0) { | |
873 | ret = -EINVAL; | |
874 | goto out; | |
875 | } | |
876 | ||
55ec8e25 | 877 | ret = macvtap_do_read(q, iv, len, file->f_flags & O_NONBLOCK); |
ce232ce0 | 878 | ret = min_t(ssize_t, ret, len); |
e6ebc7f1 ZYW |
879 | if (ret > 0) |
880 | iocb->ki_pos = ret; | |
20d29d7a | 881 | out: |
20d29d7a AB |
882 | return ret; |
883 | } | |
884 | ||
8f475a31 JW |
885 | static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q) |
886 | { | |
887 | struct macvlan_dev *vlan; | |
888 | ||
441ac0fc VY |
889 | ASSERT_RTNL(); |
890 | vlan = rtnl_dereference(q->vlan); | |
8f475a31 JW |
891 | if (vlan) |
892 | dev_hold(vlan->dev); | |
8f475a31 JW |
893 | |
894 | return vlan; | |
895 | } | |
896 | ||
897 | static void macvtap_put_vlan(struct macvlan_dev *vlan) | |
898 | { | |
899 | dev_put(vlan->dev); | |
900 | } | |
901 | ||
815f236d JW |
902 | static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags) |
903 | { | |
904 | struct macvtap_queue *q = file->private_data; | |
905 | struct macvlan_dev *vlan; | |
906 | int ret; | |
907 | ||
908 | vlan = macvtap_get_vlan(q); | |
909 | if (!vlan) | |
910 | return -EINVAL; | |
911 | ||
912 | if (flags & IFF_ATTACH_QUEUE) | |
913 | ret = macvtap_enable_queue(vlan->dev, file, q); | |
914 | else if (flags & IFF_DETACH_QUEUE) | |
915 | ret = macvtap_disable_queue(q); | |
f57855a5 JW |
916 | else |
917 | ret = -EINVAL; | |
815f236d JW |
918 | |
919 | macvtap_put_vlan(vlan); | |
920 | return ret; | |
921 | } | |
922 | ||
2be5c767 VY |
923 | static int set_offload(struct macvtap_queue *q, unsigned long arg) |
924 | { | |
925 | struct macvlan_dev *vlan; | |
926 | netdev_features_t features; | |
927 | netdev_features_t feature_mask = 0; | |
928 | ||
929 | vlan = rtnl_dereference(q->vlan); | |
930 | if (!vlan) | |
931 | return -ENOLINK; | |
932 | ||
933 | features = vlan->dev->features; | |
934 | ||
935 | if (arg & TUN_F_CSUM) { | |
936 | feature_mask = NETIF_F_HW_CSUM; | |
937 | ||
938 | if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) { | |
939 | if (arg & TUN_F_TSO_ECN) | |
940 | feature_mask |= NETIF_F_TSO_ECN; | |
941 | if (arg & TUN_F_TSO4) | |
942 | feature_mask |= NETIF_F_TSO; | |
943 | if (arg & TUN_F_TSO6) | |
944 | feature_mask |= NETIF_F_TSO6; | |
945 | } | |
946 | ||
947 | if (arg & TUN_F_UFO) | |
948 | feature_mask |= NETIF_F_UFO; | |
949 | } | |
950 | ||
951 | /* tun/tap driver inverts the usage for TSO offloads, where | |
952 | * setting the TSO bit means that the userspace wants to | |
953 | * accept TSO frames and turning it off means that user space | |
954 | * does not support TSO. | |
955 | * For macvtap, we have to invert it to mean the same thing. | |
956 | * When user space turns off TSO, we turn off GSO/LRO so that | |
957 | * user-space will not receive TSO frames. | |
958 | */ | |
959 | if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO)) | |
960 | features |= RX_OFFLOADS; | |
961 | else | |
962 | features &= ~RX_OFFLOADS; | |
963 | ||
964 | /* tap_features are the same as features on tun/tap and | |
965 | * reflect user expectations. | |
966 | */ | |
a567dd62 | 967 | vlan->tap_features = feature_mask; |
2be5c767 VY |
968 | vlan->set_features = features; |
969 | netdev_update_features(vlan->dev); | |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
20d29d7a AB |
974 | /* |
975 | * provide compatibility with generic tun/tap interface | |
976 | */ | |
977 | static long macvtap_ioctl(struct file *file, unsigned int cmd, | |
978 | unsigned long arg) | |
979 | { | |
02df55d2 AB |
980 | struct macvtap_queue *q = file->private_data; |
981 | struct macvlan_dev *vlan; | |
20d29d7a AB |
982 | void __user *argp = (void __user *)arg; |
983 | struct ifreq __user *ifr = argp; | |
984 | unsigned int __user *up = argp; | |
985 | unsigned int u; | |
55afbd08 MT |
986 | int __user *sp = argp; |
987 | int s; | |
02df55d2 | 988 | int ret; |
20d29d7a AB |
989 | |
990 | switch (cmd) { | |
991 | case TUNSETIFF: | |
992 | /* ignore the name, just look at flags */ | |
993 | if (get_user(u, &ifr->ifr_flags)) | |
994 | return -EFAULT; | |
b9fb9ee0 AB |
995 | |
996 | ret = 0; | |
815f236d JW |
997 | if ((u & ~(IFF_VNET_HDR | IFF_MULTI_QUEUE)) != |
998 | (IFF_NO_PI | IFF_TAP)) | |
b9fb9ee0 AB |
999 | ret = -EINVAL; |
1000 | else | |
1001 | q->flags = u; | |
1002 | ||
1003 | return ret; | |
20d29d7a AB |
1004 | |
1005 | case TUNGETIFF: | |
441ac0fc | 1006 | rtnl_lock(); |
8f475a31 | 1007 | vlan = macvtap_get_vlan(q); |
441ac0fc VY |
1008 | if (!vlan) { |
1009 | rtnl_unlock(); | |
20d29d7a | 1010 | return -ENOLINK; |
441ac0fc | 1011 | } |
20d29d7a | 1012 | |
02df55d2 | 1013 | ret = 0; |
13707f9e | 1014 | if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) || |
b9fb9ee0 | 1015 | put_user(q->flags, &ifr->ifr_flags)) |
02df55d2 | 1016 | ret = -EFAULT; |
8f475a31 | 1017 | macvtap_put_vlan(vlan); |
441ac0fc | 1018 | rtnl_unlock(); |
02df55d2 | 1019 | return ret; |
20d29d7a | 1020 | |
815f236d JW |
1021 | case TUNSETQUEUE: |
1022 | if (get_user(u, &ifr->ifr_flags)) | |
1023 | return -EFAULT; | |
441ac0fc VY |
1024 | rtnl_lock(); |
1025 | ret = macvtap_ioctl_set_queue(file, u); | |
1026 | rtnl_unlock(); | |
82a19eb8 | 1027 | return ret; |
815f236d | 1028 | |
20d29d7a | 1029 | case TUNGETFEATURES: |
df09b36f JW |
1030 | if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR | |
1031 | IFF_MULTI_QUEUE, up)) | |
20d29d7a AB |
1032 | return -EFAULT; |
1033 | return 0; | |
1034 | ||
1035 | case TUNSETSNDBUF: | |
1036 | if (get_user(u, up)) | |
1037 | return -EFAULT; | |
1038 | ||
20d29d7a | 1039 | q->sk.sk_sndbuf = u; |
20d29d7a AB |
1040 | return 0; |
1041 | ||
55afbd08 MT |
1042 | case TUNGETVNETHDRSZ: |
1043 | s = q->vnet_hdr_sz; | |
1044 | if (put_user(s, sp)) | |
1045 | return -EFAULT; | |
1046 | return 0; | |
1047 | ||
1048 | case TUNSETVNETHDRSZ: | |
1049 | if (get_user(s, sp)) | |
1050 | return -EFAULT; | |
1051 | if (s < (int)sizeof(struct virtio_net_hdr)) | |
1052 | return -EINVAL; | |
1053 | ||
1054 | q->vnet_hdr_sz = s; | |
1055 | return 0; | |
1056 | ||
20d29d7a AB |
1057 | case TUNSETOFFLOAD: |
1058 | /* let the user check for future flags */ | |
1059 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
b9fb9ee0 | 1060 | TUN_F_TSO_ECN | TUN_F_UFO)) |
20d29d7a AB |
1061 | return -EINVAL; |
1062 | ||
2be5c767 VY |
1063 | rtnl_lock(); |
1064 | ret = set_offload(q, arg); | |
1065 | rtnl_unlock(); | |
1066 | return ret; | |
20d29d7a AB |
1067 | |
1068 | default: | |
1069 | return -EINVAL; | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | #ifdef CONFIG_COMPAT | |
1074 | static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, | |
1075 | unsigned long arg) | |
1076 | { | |
1077 | return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
1078 | } | |
1079 | #endif | |
1080 | ||
1081 | static const struct file_operations macvtap_fops = { | |
1082 | .owner = THIS_MODULE, | |
1083 | .open = macvtap_open, | |
1084 | .release = macvtap_release, | |
1085 | .aio_read = macvtap_aio_read, | |
1086 | .aio_write = macvtap_aio_write, | |
1087 | .poll = macvtap_poll, | |
1088 | .llseek = no_llseek, | |
1089 | .unlocked_ioctl = macvtap_ioctl, | |
1090 | #ifdef CONFIG_COMPAT | |
1091 | .compat_ioctl = macvtap_compat_ioctl, | |
1092 | #endif | |
1093 | }; | |
1094 | ||
501c774c AB |
1095 | static int macvtap_sendmsg(struct kiocb *iocb, struct socket *sock, |
1096 | struct msghdr *m, size_t total_len) | |
1097 | { | |
1098 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
97bc3633 | 1099 | return macvtap_get_user(q, m, m->msg_iov, total_len, m->msg_iovlen, |
501c774c AB |
1100 | m->msg_flags & MSG_DONTWAIT); |
1101 | } | |
1102 | ||
1103 | static int macvtap_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1104 | struct msghdr *m, size_t total_len, | |
1105 | int flags) | |
1106 | { | |
1107 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
1108 | int ret; | |
1109 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
1110 | return -EINVAL; | |
55ec8e25 | 1111 | ret = macvtap_do_read(q, m->msg_iov, total_len, |
501c774c | 1112 | flags & MSG_DONTWAIT); |
de2aa476 DM |
1113 | if (ret > total_len) { |
1114 | m->msg_flags |= MSG_TRUNC; | |
1115 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1116 | } | |
501c774c AB |
1117 | return ret; |
1118 | } | |
1119 | ||
1120 | /* Ops structure to mimic raw sockets with tun */ | |
1121 | static const struct proto_ops macvtap_socket_ops = { | |
1122 | .sendmsg = macvtap_sendmsg, | |
1123 | .recvmsg = macvtap_recvmsg, | |
1124 | }; | |
1125 | ||
1126 | /* Get an underlying socket object from tun file. Returns error unless file is | |
1127 | * attached to a device. The returned object works like a packet socket, it | |
1128 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1129 | * holding a reference to the file for as long as the socket is in use. */ | |
1130 | struct socket *macvtap_get_socket(struct file *file) | |
1131 | { | |
1132 | struct macvtap_queue *q; | |
1133 | if (file->f_op != &macvtap_fops) | |
1134 | return ERR_PTR(-EINVAL); | |
1135 | q = file->private_data; | |
1136 | if (!q) | |
1137 | return ERR_PTR(-EBADFD); | |
1138 | return &q->sock; | |
1139 | } | |
1140 | EXPORT_SYMBOL_GPL(macvtap_get_socket); | |
1141 | ||
9bf1907f EB |
1142 | static int macvtap_device_event(struct notifier_block *unused, |
1143 | unsigned long event, void *ptr) | |
1144 | { | |
351638e7 | 1145 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e09eff7f | 1146 | struct macvlan_dev *vlan; |
9bf1907f EB |
1147 | struct device *classdev; |
1148 | dev_t devt; | |
e09eff7f | 1149 | int err; |
9bf1907f EB |
1150 | |
1151 | if (dev->rtnl_link_ops != &macvtap_link_ops) | |
1152 | return NOTIFY_DONE; | |
1153 | ||
e09eff7f | 1154 | vlan = netdev_priv(dev); |
9bf1907f EB |
1155 | |
1156 | switch (event) { | |
1157 | case NETDEV_REGISTER: | |
1158 | /* Create the device node here after the network device has | |
1159 | * been registered but before register_netdevice has | |
1160 | * finished running. | |
1161 | */ | |
e09eff7f EB |
1162 | err = macvtap_get_minor(vlan); |
1163 | if (err) | |
1164 | return notifier_from_errno(err); | |
1165 | ||
1166 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); | |
9bf1907f EB |
1167 | classdev = device_create(macvtap_class, &dev->dev, devt, |
1168 | dev, "tap%d", dev->ifindex); | |
e09eff7f EB |
1169 | if (IS_ERR(classdev)) { |
1170 | macvtap_free_minor(vlan); | |
9bf1907f | 1171 | return notifier_from_errno(PTR_ERR(classdev)); |
e09eff7f | 1172 | } |
9bf1907f EB |
1173 | break; |
1174 | case NETDEV_UNREGISTER: | |
e09eff7f | 1175 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); |
9bf1907f | 1176 | device_destroy(macvtap_class, devt); |
e09eff7f | 1177 | macvtap_free_minor(vlan); |
9bf1907f EB |
1178 | break; |
1179 | } | |
1180 | ||
1181 | return NOTIFY_DONE; | |
1182 | } | |
1183 | ||
1184 | static struct notifier_block macvtap_notifier_block __read_mostly = { | |
1185 | .notifier_call = macvtap_device_event, | |
1186 | }; | |
1187 | ||
20d29d7a AB |
1188 | static int macvtap_init(void) |
1189 | { | |
1190 | int err; | |
1191 | ||
1192 | err = alloc_chrdev_region(&macvtap_major, 0, | |
1193 | MACVTAP_NUM_DEVS, "macvtap"); | |
1194 | if (err) | |
1195 | goto out1; | |
1196 | ||
1197 | cdev_init(&macvtap_cdev, &macvtap_fops); | |
1198 | err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); | |
1199 | if (err) | |
1200 | goto out2; | |
1201 | ||
1202 | macvtap_class = class_create(THIS_MODULE, "macvtap"); | |
1203 | if (IS_ERR(macvtap_class)) { | |
1204 | err = PTR_ERR(macvtap_class); | |
1205 | goto out3; | |
1206 | } | |
1207 | ||
9bf1907f | 1208 | err = register_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1209 | if (err) |
1210 | goto out4; | |
1211 | ||
9bf1907f EB |
1212 | err = macvlan_link_register(&macvtap_link_ops); |
1213 | if (err) | |
1214 | goto out5; | |
1215 | ||
20d29d7a AB |
1216 | return 0; |
1217 | ||
9bf1907f EB |
1218 | out5: |
1219 | unregister_netdevice_notifier(&macvtap_notifier_block); | |
20d29d7a AB |
1220 | out4: |
1221 | class_unregister(macvtap_class); | |
1222 | out3: | |
1223 | cdev_del(&macvtap_cdev); | |
1224 | out2: | |
1225 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1226 | out1: | |
1227 | return err; | |
1228 | } | |
1229 | module_init(macvtap_init); | |
1230 | ||
1231 | static void macvtap_exit(void) | |
1232 | { | |
1233 | rtnl_link_unregister(&macvtap_link_ops); | |
9bf1907f | 1234 | unregister_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1235 | class_unregister(macvtap_class); |
1236 | cdev_del(&macvtap_cdev); | |
1237 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1238 | } | |
1239 | module_exit(macvtap_exit); | |
1240 | ||
1241 | MODULE_ALIAS_RTNL_LINK("macvtap"); | |
1242 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
1243 | MODULE_LICENSE("GPL"); |