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Commit | Line | Data |
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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 | ||
40b8fe45 | 115 | /* Requires RTNL */ |
815f236d JW |
116 | static int macvtap_set_queue(struct net_device *dev, struct file *file, |
117 | struct macvtap_queue *q) | |
20d29d7a AB |
118 | { |
119 | struct macvlan_dev *vlan = netdev_priv(dev); | |
20d29d7a | 120 | |
815f236d | 121 | if (vlan->numqueues == MAX_MACVTAP_QUEUES) |
40b8fe45 | 122 | return -EBUSY; |
20d29d7a | 123 | |
02df55d2 | 124 | rcu_assign_pointer(q->vlan, vlan); |
376b1aab | 125 | rcu_assign_pointer(vlan->taps[vlan->numvtaps], q); |
02df55d2 | 126 | sock_hold(&q->sk); |
20d29d7a AB |
127 | |
128 | q->file = file; | |
376b1aab | 129 | q->queue_index = vlan->numvtaps; |
815f236d | 130 | q->enabled = true; |
02df55d2 | 131 | file->private_data = q; |
815f236d | 132 | list_add_tail(&q->next, &vlan->queue_list); |
20d29d7a | 133 | |
1565c7c1 | 134 | vlan->numvtaps++; |
815f236d | 135 | vlan->numqueues++; |
1565c7c1 | 136 | |
40b8fe45 | 137 | return 0; |
20d29d7a AB |
138 | } |
139 | ||
441ac0fc | 140 | static int macvtap_disable_queue(struct macvtap_queue *q) |
815f236d JW |
141 | { |
142 | struct macvlan_dev *vlan; | |
143 | struct macvtap_queue *nq; | |
144 | ||
441ac0fc | 145 | ASSERT_RTNL(); |
815f236d JW |
146 | if (!q->enabled) |
147 | return -EINVAL; | |
148 | ||
441ac0fc VY |
149 | vlan = rtnl_dereference(q->vlan); |
150 | ||
815f236d JW |
151 | if (vlan) { |
152 | int index = q->queue_index; | |
153 | BUG_ON(index >= vlan->numvtaps); | |
441ac0fc | 154 | nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]); |
815f236d JW |
155 | nq->queue_index = index; |
156 | ||
157 | rcu_assign_pointer(vlan->taps[index], nq); | |
158 | RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL); | |
159 | q->enabled = false; | |
160 | ||
161 | vlan->numvtaps--; | |
162 | } | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
20d29d7a | 167 | /* |
02df55d2 AB |
168 | * The file owning the queue got closed, give up both |
169 | * the reference that the files holds as well as the | |
170 | * one from the macvlan_dev if that still exists. | |
20d29d7a AB |
171 | * |
172 | * Using the spinlock makes sure that we don't get | |
173 | * to the queue again after destroying it. | |
20d29d7a | 174 | */ |
02df55d2 | 175 | static void macvtap_put_queue(struct macvtap_queue *q) |
20d29d7a | 176 | { |
02df55d2 | 177 | struct macvlan_dev *vlan; |
20d29d7a | 178 | |
441ac0fc VY |
179 | rtnl_lock(); |
180 | vlan = rtnl_dereference(q->vlan); | |
181 | ||
02df55d2 | 182 | if (vlan) { |
815f236d | 183 | if (q->enabled) |
441ac0fc | 184 | BUG_ON(macvtap_disable_queue(q)); |
376b1aab | 185 | |
815f236d | 186 | vlan->numqueues--; |
2cfa5a04 | 187 | RCU_INIT_POINTER(q->vlan, NULL); |
02df55d2 | 188 | sock_put(&q->sk); |
815f236d | 189 | list_del_init(&q->next); |
20d29d7a AB |
190 | } |
191 | ||
441ac0fc | 192 | rtnl_unlock(); |
20d29d7a AB |
193 | |
194 | synchronize_rcu(); | |
195 | sock_put(&q->sk); | |
196 | } | |
197 | ||
198 | /* | |
1565c7c1 KK |
199 | * Select a queue based on the rxq of the device on which this packet |
200 | * arrived. If the incoming device is not mq, calculate a flow hash | |
201 | * to select a queue. If all fails, find the first available queue. | |
202 | * Cache vlan->numvtaps since it can become zero during the execution | |
203 | * of this function. | |
20d29d7a AB |
204 | */ |
205 | static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, | |
206 | struct sk_buff *skb) | |
207 | { | |
208 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 | 209 | struct macvtap_queue *tap = NULL; |
815f236d JW |
210 | /* Access to taps array is protected by rcu, but access to numvtaps |
211 | * isn't. Below we use it to lookup a queue, but treat it as a hint | |
212 | * and validate that the result isn't NULL - in case we are | |
213 | * racing against queue removal. | |
214 | */ | |
ed0483fa | 215 | int numvtaps = ACCESS_ONCE(vlan->numvtaps); |
1565c7c1 KK |
216 | __u32 rxq; |
217 | ||
218 | if (!numvtaps) | |
219 | goto out; | |
220 | ||
ef0002b5 | 221 | /* Check if we can use flow to select a queue */ |
3958afa1 | 222 | rxq = skb_get_hash(skb); |
ef0002b5 KK |
223 | if (rxq) { |
224 | tap = rcu_dereference(vlan->taps[rxq % numvtaps]); | |
376b1aab | 225 | goto out; |
ef0002b5 KK |
226 | } |
227 | ||
1565c7c1 KK |
228 | if (likely(skb_rx_queue_recorded(skb))) { |
229 | rxq = skb_get_rx_queue(skb); | |
20d29d7a | 230 | |
1565c7c1 KK |
231 | while (unlikely(rxq >= numvtaps)) |
232 | rxq -= numvtaps; | |
233 | ||
234 | tap = rcu_dereference(vlan->taps[rxq]); | |
376b1aab | 235 | goto out; |
1565c7c1 KK |
236 | } |
237 | ||
376b1aab | 238 | tap = rcu_dereference(vlan->taps[0]); |
1565c7c1 KK |
239 | out: |
240 | return tap; | |
20d29d7a AB |
241 | } |
242 | ||
02df55d2 AB |
243 | /* |
244 | * The net_device is going away, give up the reference | |
1565c7c1 KK |
245 | * that it holds on all queues and safely set the pointer |
246 | * from the queues to NULL. | |
02df55d2 | 247 | */ |
20d29d7a AB |
248 | static void macvtap_del_queues(struct net_device *dev) |
249 | { | |
250 | struct macvlan_dev *vlan = netdev_priv(dev); | |
815f236d | 251 | struct macvtap_queue *q, *tmp, *qlist[MAX_MACVTAP_QUEUES]; |
1565c7c1 | 252 | int i, j = 0; |
02df55d2 | 253 | |
441ac0fc | 254 | ASSERT_RTNL(); |
815f236d JW |
255 | list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) { |
256 | list_del_init(&q->next); | |
376b1aab | 257 | qlist[j++] = q; |
376b1aab | 258 | RCU_INIT_POINTER(q->vlan, NULL); |
815f236d JW |
259 | if (q->enabled) |
260 | vlan->numvtaps--; | |
261 | vlan->numqueues--; | |
564517e8 | 262 | } |
815f236d JW |
263 | for (i = 0; i < vlan->numvtaps; i++) |
264 | RCU_INIT_POINTER(vlan->taps[i], NULL); | |
265 | BUG_ON(vlan->numvtaps); | |
266 | BUG_ON(vlan->numqueues); | |
99f34b38 EB |
267 | /* guarantee that any future macvtap_set_queue will fail */ |
268 | vlan->numvtaps = MAX_MACVTAP_QUEUES; | |
1565c7c1 KK |
269 | |
270 | for (--j; j >= 0; j--) | |
271 | sock_put(&qlist[j]->sk); | |
20d29d7a AB |
272 | } |
273 | ||
6acf54f1 | 274 | static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb) |
20d29d7a | 275 | { |
6acf54f1 VY |
276 | struct sk_buff *skb = *pskb; |
277 | struct net_device *dev = skb->dev; | |
278 | struct macvlan_dev *vlan; | |
279 | struct macvtap_queue *q; | |
a567dd62 VY |
280 | netdev_features_t features = TAP_FEATURES; |
281 | ||
6acf54f1 VY |
282 | vlan = macvtap_get_vlan_rcu(dev); |
283 | if (!vlan) | |
284 | return RX_HANDLER_PASS; | |
285 | ||
286 | q = macvtap_get_queue(dev, skb); | |
20d29d7a | 287 | if (!q) |
6acf54f1 | 288 | return RX_HANDLER_PASS; |
8a35747a HX |
289 | |
290 | if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len) | |
291 | goto drop; | |
20d29d7a | 292 | |
6acf54f1 VY |
293 | skb_push(skb, ETH_HLEN); |
294 | ||
3e4f8b78 | 295 | /* Apply the forward feature mask so that we perform segmentation |
e5733321 VY |
296 | * according to users wishes. This only works if VNET_HDR is |
297 | * enabled. | |
3e4f8b78 | 298 | */ |
e5733321 VY |
299 | if (q->flags & IFF_VNET_HDR) |
300 | features |= vlan->tap_features; | |
3e4f8b78 VY |
301 | if (netif_needs_gso(skb, features)) { |
302 | struct sk_buff *segs = __skb_gso_segment(skb, features, false); | |
303 | ||
304 | if (IS_ERR(segs)) | |
305 | goto drop; | |
306 | ||
307 | if (!segs) { | |
308 | skb_queue_tail(&q->sk.sk_receive_queue, skb); | |
309 | goto wake_up; | |
310 | } | |
311 | ||
312 | kfree_skb(skb); | |
313 | while (segs) { | |
314 | struct sk_buff *nskb = segs->next; | |
315 | ||
316 | segs->next = NULL; | |
317 | skb_queue_tail(&q->sk.sk_receive_queue, segs); | |
318 | segs = nskb; | |
319 | } | |
320 | } else { | |
cbdb0427 VY |
321 | /* If we receive a partial checksum and the tap side |
322 | * doesn't support checksum offload, compute the checksum. | |
323 | * Note: it doesn't matter which checksum feature to | |
324 | * check, we either support them all or none. | |
325 | */ | |
326 | if (skb->ip_summed == CHECKSUM_PARTIAL && | |
327 | !(features & NETIF_F_ALL_CSUM) && | |
328 | skb_checksum_help(skb)) | |
329 | goto drop; | |
3e4f8b78 VY |
330 | skb_queue_tail(&q->sk.sk_receive_queue, skb); |
331 | } | |
332 | ||
333 | wake_up: | |
4a4771a5 | 334 | wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND); |
6acf54f1 | 335 | return RX_HANDLER_CONSUMED; |
8a35747a HX |
336 | |
337 | drop: | |
6acf54f1 VY |
338 | /* Count errors/drops only here, thus don't care about args. */ |
339 | macvlan_count_rx(vlan, 0, 0, 0); | |
8a35747a | 340 | kfree_skb(skb); |
6acf54f1 | 341 | return RX_HANDLER_CONSUMED; |
20d29d7a AB |
342 | } |
343 | ||
e09eff7f EB |
344 | static int macvtap_get_minor(struct macvlan_dev *vlan) |
345 | { | |
346 | int retval = -ENOMEM; | |
e09eff7f EB |
347 | |
348 | mutex_lock(&minor_lock); | |
ec09ebc1 TH |
349 | retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL); |
350 | if (retval >= 0) { | |
351 | vlan->minor = retval; | |
352 | } else if (retval == -ENOSPC) { | |
e09eff7f EB |
353 | printk(KERN_ERR "too many macvtap devices\n"); |
354 | retval = -EINVAL; | |
e09eff7f | 355 | } |
e09eff7f | 356 | mutex_unlock(&minor_lock); |
ec09ebc1 | 357 | return retval < 0 ? retval : 0; |
e09eff7f EB |
358 | } |
359 | ||
360 | static void macvtap_free_minor(struct macvlan_dev *vlan) | |
361 | { | |
362 | mutex_lock(&minor_lock); | |
363 | if (vlan->minor) { | |
364 | idr_remove(&minor_idr, vlan->minor); | |
365 | vlan->minor = 0; | |
366 | } | |
367 | mutex_unlock(&minor_lock); | |
368 | } | |
369 | ||
370 | static struct net_device *dev_get_by_macvtap_minor(int minor) | |
371 | { | |
372 | struct net_device *dev = NULL; | |
373 | struct macvlan_dev *vlan; | |
374 | ||
375 | mutex_lock(&minor_lock); | |
376 | vlan = idr_find(&minor_idr, minor); | |
377 | if (vlan) { | |
378 | dev = vlan->dev; | |
379 | dev_hold(dev); | |
380 | } | |
381 | mutex_unlock(&minor_lock); | |
382 | return dev; | |
383 | } | |
384 | ||
20d29d7a AB |
385 | static int macvtap_newlink(struct net *src_net, |
386 | struct net_device *dev, | |
387 | struct nlattr *tb[], | |
388 | struct nlattr *data[]) | |
389 | { | |
815f236d | 390 | struct macvlan_dev *vlan = netdev_priv(dev); |
6acf54f1 VY |
391 | int err; |
392 | ||
815f236d JW |
393 | INIT_LIST_HEAD(&vlan->queue_list); |
394 | ||
2be5c767 VY |
395 | /* Since macvlan supports all offloads by default, make |
396 | * tap support all offloads also. | |
397 | */ | |
398 | vlan->tap_features = TUN_OFFLOADS; | |
399 | ||
6acf54f1 VY |
400 | err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan); |
401 | if (err) | |
402 | return err; | |
403 | ||
9bf1907f EB |
404 | /* Don't put anything that may fail after macvlan_common_newlink |
405 | * because we can't undo what it does. | |
406 | */ | |
2f6a1b66 | 407 | return macvlan_common_newlink(src_net, dev, tb, data); |
20d29d7a AB |
408 | } |
409 | ||
410 | static void macvtap_dellink(struct net_device *dev, | |
411 | struct list_head *head) | |
412 | { | |
6acf54f1 | 413 | netdev_rx_handler_unregister(dev); |
20d29d7a AB |
414 | macvtap_del_queues(dev); |
415 | macvlan_dellink(dev, head); | |
416 | } | |
417 | ||
8a35747a HX |
418 | static void macvtap_setup(struct net_device *dev) |
419 | { | |
420 | macvlan_common_setup(dev); | |
421 | dev->tx_queue_len = TUN_READQ_SIZE; | |
422 | } | |
423 | ||
20d29d7a AB |
424 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { |
425 | .kind = "macvtap", | |
8a35747a | 426 | .setup = macvtap_setup, |
20d29d7a AB |
427 | .newlink = macvtap_newlink, |
428 | .dellink = macvtap_dellink, | |
429 | }; | |
430 | ||
431 | ||
432 | static void macvtap_sock_write_space(struct sock *sk) | |
433 | { | |
43815482 ED |
434 | wait_queue_head_t *wqueue; |
435 | ||
20d29d7a AB |
436 | if (!sock_writeable(sk) || |
437 | !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
438 | return; | |
439 | ||
43815482 ED |
440 | wqueue = sk_sleep(sk); |
441 | if (wqueue && waitqueue_active(wqueue)) | |
442 | wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND); | |
20d29d7a AB |
443 | } |
444 | ||
2259fef0 EB |
445 | static void macvtap_sock_destruct(struct sock *sk) |
446 | { | |
447 | skb_queue_purge(&sk->sk_receive_queue); | |
448 | } | |
449 | ||
20d29d7a AB |
450 | static int macvtap_open(struct inode *inode, struct file *file) |
451 | { | |
452 | struct net *net = current->nsproxy->net_ns; | |
40b8fe45 | 453 | struct net_device *dev; |
20d29d7a | 454 | struct macvtap_queue *q; |
40b8fe45 | 455 | int err = -ENODEV; |
20d29d7a | 456 | |
40b8fe45 VY |
457 | rtnl_lock(); |
458 | dev = dev_get_by_macvtap_minor(iminor(inode)); | |
20d29d7a AB |
459 | if (!dev) |
460 | goto out; | |
461 | ||
20d29d7a AB |
462 | err = -ENOMEM; |
463 | q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, | |
464 | &macvtap_proto); | |
465 | if (!q) | |
466 | goto out; | |
467 | ||
d9a90a31 | 468 | RCU_INIT_POINTER(q->sock.wq, &q->wq); |
43815482 | 469 | init_waitqueue_head(&q->wq.wait); |
20d29d7a AB |
470 | q->sock.type = SOCK_RAW; |
471 | q->sock.state = SS_CONNECTED; | |
501c774c AB |
472 | q->sock.file = file; |
473 | q->sock.ops = &macvtap_socket_ops; | |
20d29d7a | 474 | sock_init_data(&q->sock, &q->sk); |
20d29d7a | 475 | q->sk.sk_write_space = macvtap_sock_write_space; |
2259fef0 | 476 | q->sk.sk_destruct = macvtap_sock_destruct; |
b9fb9ee0 | 477 | q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; |
55afbd08 | 478 | q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
20d29d7a | 479 | |
97bc3633 SM |
480 | /* |
481 | * so far only KVM virtio_net uses macvtap, enable zero copy between | |
482 | * guest kernel and host kernel when lower device supports zerocopy | |
047af9cf EB |
483 | * |
484 | * The macvlan supports zerocopy iff the lower device supports zero | |
485 | * copy so we don't have to look at the lower device directly. | |
97bc3633 | 486 | */ |
047af9cf EB |
487 | if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG)) |
488 | sock_set_flag(&q->sk, SOCK_ZEROCOPY); | |
97bc3633 | 489 | |
20d29d7a AB |
490 | err = macvtap_set_queue(dev, file, q); |
491 | if (err) | |
492 | sock_put(&q->sk); | |
493 | ||
494 | out: | |
495 | if (dev) | |
496 | dev_put(dev); | |
497 | ||
40b8fe45 | 498 | rtnl_unlock(); |
20d29d7a AB |
499 | return err; |
500 | } | |
501 | ||
502 | static int macvtap_release(struct inode *inode, struct file *file) | |
503 | { | |
02df55d2 AB |
504 | struct macvtap_queue *q = file->private_data; |
505 | macvtap_put_queue(q); | |
20d29d7a AB |
506 | return 0; |
507 | } | |
508 | ||
509 | static unsigned int macvtap_poll(struct file *file, poll_table * wait) | |
510 | { | |
02df55d2 | 511 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
512 | unsigned int mask = POLLERR; |
513 | ||
514 | if (!q) | |
515 | goto out; | |
516 | ||
517 | mask = 0; | |
43815482 | 518 | poll_wait(file, &q->wq.wait, wait); |
20d29d7a AB |
519 | |
520 | if (!skb_queue_empty(&q->sk.sk_receive_queue)) | |
521 | mask |= POLLIN | POLLRDNORM; | |
522 | ||
523 | if (sock_writeable(&q->sk) || | |
524 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) && | |
525 | sock_writeable(&q->sk))) | |
526 | mask |= POLLOUT | POLLWRNORM; | |
527 | ||
528 | out: | |
20d29d7a AB |
529 | return mask; |
530 | } | |
531 | ||
b9fb9ee0 AB |
532 | static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, |
533 | size_t len, size_t linear, | |
534 | int noblock, int *err) | |
535 | { | |
536 | struct sk_buff *skb; | |
537 | ||
538 | /* Under a page? Don't bother with paged skb. */ | |
539 | if (prepad + len < PAGE_SIZE || !linear) | |
540 | linear = len; | |
541 | ||
542 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
28d64271 | 543 | err, 0); |
b9fb9ee0 AB |
544 | if (!skb) |
545 | return NULL; | |
546 | ||
547 | skb_reserve(skb, prepad); | |
548 | skb_put(skb, linear); | |
549 | skb->data_len = len - linear; | |
550 | skb->len += len - linear; | |
551 | ||
552 | return skb; | |
553 | } | |
554 | ||
555 | /* | |
556 | * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should | |
557 | * be shared with the tun/tap driver. | |
558 | */ | |
559 | static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, | |
560 | struct virtio_net_hdr *vnet_hdr) | |
561 | { | |
562 | unsigned short gso_type = 0; | |
563 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
564 | switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
565 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
566 | gso_type = SKB_GSO_TCPV4; | |
567 | break; | |
568 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
569 | gso_type = SKB_GSO_TCPV6; | |
570 | break; | |
571 | case VIRTIO_NET_HDR_GSO_UDP: | |
572 | gso_type = SKB_GSO_UDP; | |
573 | break; | |
574 | default: | |
575 | return -EINVAL; | |
576 | } | |
577 | ||
578 | if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
579 | gso_type |= SKB_GSO_TCP_ECN; | |
580 | ||
581 | if (vnet_hdr->gso_size == 0) | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
586 | if (!skb_partial_csum_set(skb, vnet_hdr->csum_start, | |
587 | vnet_hdr->csum_offset)) | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
592 | skb_shinfo(skb)->gso_size = vnet_hdr->gso_size; | |
c9af6db4 | 593 | skb_shinfo(skb)->gso_type = gso_type; |
b9fb9ee0 AB |
594 | |
595 | /* Header must be checked, and gso_segs computed. */ | |
596 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
597 | skb_shinfo(skb)->gso_segs = 0; | |
598 | } | |
599 | return 0; | |
600 | } | |
601 | ||
359d44d7 | 602 | static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, |
b9fb9ee0 AB |
603 | struct virtio_net_hdr *vnet_hdr) |
604 | { | |
605 | memset(vnet_hdr, 0, sizeof(*vnet_hdr)); | |
606 | ||
607 | if (skb_is_gso(skb)) { | |
608 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
609 | ||
610 | /* This is a hint as to how much should be linear. */ | |
611 | vnet_hdr->hdr_len = skb_headlen(skb); | |
612 | vnet_hdr->gso_size = sinfo->gso_size; | |
613 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
614 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
615 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
616 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
617 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
618 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
619 | else | |
620 | BUG(); | |
621 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
622 | vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
623 | } else | |
624 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
625 | ||
626 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
627 | vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 628 | vnet_hdr->csum_start = skb_checksum_start_offset(skb); |
b9fb9ee0 | 629 | vnet_hdr->csum_offset = skb->csum_offset; |
10a8d94a JW |
630 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
631 | vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
b9fb9ee0 | 632 | } /* else everything is zero */ |
b9fb9ee0 AB |
633 | } |
634 | ||
20d29d7a | 635 | /* Get packet from user space buffer */ |
97bc3633 SM |
636 | static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, |
637 | const struct iovec *iv, unsigned long total_len, | |
638 | size_t count, int noblock) | |
20d29d7a | 639 | { |
16a3fa28 | 640 | int good_linear = SKB_MAX_HEAD(NET_IP_ALIGN); |
20d29d7a | 641 | struct sk_buff *skb; |
02df55d2 | 642 | struct macvlan_dev *vlan; |
97bc3633 | 643 | unsigned long len = total_len; |
20d29d7a | 644 | int err; |
b9fb9ee0 AB |
645 | struct virtio_net_hdr vnet_hdr = { 0 }; |
646 | int vnet_hdr_len = 0; | |
b92946e2 | 647 | int copylen = 0; |
97bc3633 | 648 | bool zerocopy = false; |
61d46bf9 | 649 | size_t linear; |
b9fb9ee0 AB |
650 | |
651 | if (q->flags & IFF_VNET_HDR) { | |
55afbd08 | 652 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
653 | |
654 | err = -EINVAL; | |
ce3c8692 | 655 | if (len < vnet_hdr_len) |
b9fb9ee0 | 656 | goto err; |
ce3c8692 | 657 | len -= vnet_hdr_len; |
b9fb9ee0 AB |
658 | |
659 | err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0, | |
55afbd08 | 660 | sizeof(vnet_hdr)); |
b9fb9ee0 AB |
661 | if (err < 0) |
662 | goto err; | |
663 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
664 | vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
665 | vnet_hdr.hdr_len) | |
666 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
667 | vnet_hdr.csum_offset + 2; | |
668 | err = -EINVAL; | |
669 | if (vnet_hdr.hdr_len > len) | |
670 | goto err; | |
671 | } | |
20d29d7a | 672 | |
b9fb9ee0 | 673 | err = -EINVAL; |
20d29d7a | 674 | if (unlikely(len < ETH_HLEN)) |
b9fb9ee0 | 675 | goto err; |
20d29d7a | 676 | |
b92946e2 JW |
677 | err = -EMSGSIZE; |
678 | if (unlikely(count > UIO_MAXIOV)) | |
679 | goto err; | |
680 | ||
ece793fc JW |
681 | if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) { |
682 | copylen = vnet_hdr.hdr_len ? vnet_hdr.hdr_len : GOODCOPY_LEN; | |
16a3fa28 JW |
683 | if (copylen > good_linear) |
684 | copylen = good_linear; | |
61d46bf9 | 685 | linear = copylen; |
ece793fc JW |
686 | if (iov_pages(iv, vnet_hdr_len + copylen, count) |
687 | <= MAX_SKB_FRAGS) | |
688 | zerocopy = true; | |
689 | } | |
690 | ||
691 | if (!zerocopy) { | |
97bc3633 | 692 | copylen = len; |
16a3fa28 JW |
693 | if (vnet_hdr.hdr_len > good_linear) |
694 | linear = good_linear; | |
695 | else | |
696 | linear = vnet_hdr.hdr_len; | |
61d46bf9 | 697 | } |
97bc3633 SM |
698 | |
699 | skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen, | |
61d46bf9 | 700 | linear, noblock, &err); |
02df55d2 AB |
701 | if (!skb) |
702 | goto err; | |
20d29d7a | 703 | |
01d6657b | 704 | if (zerocopy) |
97bc3633 | 705 | err = zerocopy_sg_from_iovec(skb, iv, vnet_hdr_len, count); |
ece793fc | 706 | else { |
97bc3633 SM |
707 | err = skb_copy_datagram_from_iovec(skb, 0, iv, vnet_hdr_len, |
708 | len); | |
ece793fc JW |
709 | if (!err && m && m->msg_control) { |
710 | struct ubuf_info *uarg = m->msg_control; | |
711 | uarg->callback(uarg, false); | |
712 | } | |
713 | } | |
714 | ||
02df55d2 | 715 | if (err) |
b9fb9ee0 | 716 | goto err_kfree; |
20d29d7a AB |
717 | |
718 | skb_set_network_header(skb, ETH_HLEN); | |
b9fb9ee0 AB |
719 | skb_reset_mac_header(skb); |
720 | skb->protocol = eth_hdr(skb)->h_proto; | |
721 | ||
722 | if (vnet_hdr_len) { | |
723 | err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr); | |
724 | if (err) | |
725 | goto err_kfree; | |
726 | } | |
727 | ||
40893fd0 | 728 | skb_probe_transport_header(skb, ETH_HLEN); |
9b4d669b | 729 | |
ac4e4af1 VY |
730 | rcu_read_lock(); |
731 | vlan = rcu_dereference(q->vlan); | |
97bc3633 | 732 | /* copy skb_ubuf_info for callback when skb has no error */ |
01d6657b | 733 | if (zerocopy) { |
97bc3633 | 734 | skb_shinfo(skb)->destructor_arg = m->msg_control; |
01d6657b | 735 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; |
c9af6db4 | 736 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
01d6657b | 737 | } |
29d79196 | 738 | if (vlan) { |
6acf54f1 VY |
739 | skb->dev = vlan->dev; |
740 | dev_queue_xmit(skb); | |
29d79196 | 741 | } else { |
02df55d2 | 742 | kfree_skb(skb); |
29d79196 | 743 | } |
ac4e4af1 | 744 | rcu_read_unlock(); |
20d29d7a | 745 | |
97bc3633 | 746 | return total_len; |
02df55d2 | 747 | |
b9fb9ee0 AB |
748 | err_kfree: |
749 | kfree_skb(skb); | |
750 | ||
02df55d2 | 751 | err: |
ac4e4af1 VY |
752 | rcu_read_lock(); |
753 | vlan = rcu_dereference(q->vlan); | |
02df55d2 | 754 | if (vlan) |
cd3e22b7 | 755 | this_cpu_inc(vlan->pcpu_stats->tx_dropped); |
ac4e4af1 | 756 | rcu_read_unlock(); |
02df55d2 | 757 | |
02df55d2 | 758 | return err; |
20d29d7a AB |
759 | } |
760 | ||
761 | static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv, | |
762 | unsigned long count, loff_t pos) | |
763 | { | |
764 | struct file *file = iocb->ki_filp; | |
765 | ssize_t result = -ENOLINK; | |
02df55d2 | 766 | struct macvtap_queue *q = file->private_data; |
20d29d7a | 767 | |
97bc3633 SM |
768 | result = macvtap_get_user(q, NULL, iv, iov_length(iv, count), count, |
769 | file->f_flags & O_NONBLOCK); | |
20d29d7a AB |
770 | return result; |
771 | } | |
772 | ||
773 | /* Put packet to the user space buffer */ | |
774 | static ssize_t macvtap_put_user(struct macvtap_queue *q, | |
775 | const struct sk_buff *skb, | |
776 | const struct iovec *iv, int len) | |
777 | { | |
20d29d7a | 778 | int ret; |
b9fb9ee0 | 779 | int vnet_hdr_len = 0; |
f09e2249 | 780 | int vlan_offset = 0; |
ce232ce0 | 781 | int copied, total; |
b9fb9ee0 AB |
782 | |
783 | if (q->flags & IFF_VNET_HDR) { | |
784 | struct virtio_net_hdr vnet_hdr; | |
55afbd08 | 785 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
786 | if ((len -= vnet_hdr_len) < 0) |
787 | return -EINVAL; | |
788 | ||
359d44d7 | 789 | macvtap_skb_to_vnet_hdr(skb, &vnet_hdr); |
b9fb9ee0 | 790 | |
55afbd08 | 791 | if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr))) |
b9fb9ee0 AB |
792 | return -EFAULT; |
793 | } | |
ce232ce0 JW |
794 | total = copied = vnet_hdr_len; |
795 | total += skb->len; | |
f09e2249 BG |
796 | |
797 | if (!vlan_tx_tag_present(skb)) | |
798 | len = min_t(int, skb->len, len); | |
799 | else { | |
800 | int copy; | |
801 | struct { | |
802 | __be16 h_vlan_proto; | |
803 | __be16 h_vlan_TCI; | |
804 | } veth; | |
0fbe0d47 | 805 | veth.h_vlan_proto = skb->vlan_proto; |
f09e2249 BG |
806 | veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb)); |
807 | ||
808 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
809 | len = min_t(int, skb->len + VLAN_HLEN, len); | |
ce232ce0 | 810 | total += VLAN_HLEN; |
f09e2249 BG |
811 | |
812 | copy = min_t(int, vlan_offset, len); | |
813 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy); | |
814 | len -= copy; | |
815 | copied += copy; | |
816 | if (ret || !len) | |
817 | goto done; | |
818 | ||
819 | copy = min_t(int, sizeof(veth), len); | |
820 | ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy); | |
821 | len -= copy; | |
822 | copied += copy; | |
823 | if (ret || !len) | |
824 | goto done; | |
825 | } | |
20d29d7a | 826 | |
f09e2249 | 827 | ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); |
20d29d7a | 828 | |
f09e2249 | 829 | done: |
ce232ce0 | 830 | return ret ? ret : total; |
20d29d7a AB |
831 | } |
832 | ||
55ec8e25 | 833 | static ssize_t macvtap_do_read(struct macvtap_queue *q, |
501c774c AB |
834 | const struct iovec *iv, unsigned long len, |
835 | int noblock) | |
20d29d7a | 836 | { |
ccf7e72b | 837 | DEFINE_WAIT(wait); |
20d29d7a | 838 | struct sk_buff *skb; |
501c774c | 839 | ssize_t ret = 0; |
20d29d7a | 840 | |
20d29d7a | 841 | while (len) { |
89cee917 JW |
842 | if (!noblock) |
843 | prepare_to_wait(sk_sleep(&q->sk), &wait, | |
844 | TASK_INTERRUPTIBLE); | |
20d29d7a AB |
845 | |
846 | /* Read frames from the queue */ | |
847 | skb = skb_dequeue(&q->sk.sk_receive_queue); | |
848 | if (!skb) { | |
501c774c | 849 | if (noblock) { |
20d29d7a AB |
850 | ret = -EAGAIN; |
851 | break; | |
852 | } | |
853 | if (signal_pending(current)) { | |
854 | ret = -ERESTARTSYS; | |
855 | break; | |
856 | } | |
857 | /* Nothing to read, let's sleep */ | |
858 | schedule(); | |
859 | continue; | |
860 | } | |
861 | ret = macvtap_put_user(q, skb, iv, len); | |
862 | kfree_skb(skb); | |
863 | break; | |
864 | } | |
865 | ||
89cee917 JW |
866 | if (!noblock) |
867 | finish_wait(sk_sleep(&q->sk), &wait); | |
501c774c AB |
868 | return ret; |
869 | } | |
870 | ||
871 | static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
872 | unsigned long count, loff_t pos) | |
873 | { | |
874 | struct file *file = iocb->ki_filp; | |
875 | struct macvtap_queue *q = file->private_data; | |
876 | ssize_t len, ret = 0; | |
20d29d7a | 877 | |
501c774c AB |
878 | len = iov_length(iv, count); |
879 | if (len < 0) { | |
880 | ret = -EINVAL; | |
881 | goto out; | |
882 | } | |
883 | ||
55ec8e25 | 884 | ret = macvtap_do_read(q, iv, len, file->f_flags & O_NONBLOCK); |
ce232ce0 | 885 | ret = min_t(ssize_t, ret, len); |
e6ebc7f1 ZYW |
886 | if (ret > 0) |
887 | iocb->ki_pos = ret; | |
20d29d7a | 888 | out: |
20d29d7a AB |
889 | return ret; |
890 | } | |
891 | ||
8f475a31 JW |
892 | static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q) |
893 | { | |
894 | struct macvlan_dev *vlan; | |
895 | ||
441ac0fc VY |
896 | ASSERT_RTNL(); |
897 | vlan = rtnl_dereference(q->vlan); | |
8f475a31 JW |
898 | if (vlan) |
899 | dev_hold(vlan->dev); | |
8f475a31 JW |
900 | |
901 | return vlan; | |
902 | } | |
903 | ||
904 | static void macvtap_put_vlan(struct macvlan_dev *vlan) | |
905 | { | |
906 | dev_put(vlan->dev); | |
907 | } | |
908 | ||
815f236d JW |
909 | static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags) |
910 | { | |
911 | struct macvtap_queue *q = file->private_data; | |
912 | struct macvlan_dev *vlan; | |
913 | int ret; | |
914 | ||
915 | vlan = macvtap_get_vlan(q); | |
916 | if (!vlan) | |
917 | return -EINVAL; | |
918 | ||
919 | if (flags & IFF_ATTACH_QUEUE) | |
920 | ret = macvtap_enable_queue(vlan->dev, file, q); | |
921 | else if (flags & IFF_DETACH_QUEUE) | |
922 | ret = macvtap_disable_queue(q); | |
f57855a5 JW |
923 | else |
924 | ret = -EINVAL; | |
815f236d JW |
925 | |
926 | macvtap_put_vlan(vlan); | |
927 | return ret; | |
928 | } | |
929 | ||
2be5c767 VY |
930 | static int set_offload(struct macvtap_queue *q, unsigned long arg) |
931 | { | |
932 | struct macvlan_dev *vlan; | |
933 | netdev_features_t features; | |
934 | netdev_features_t feature_mask = 0; | |
935 | ||
936 | vlan = rtnl_dereference(q->vlan); | |
937 | if (!vlan) | |
938 | return -ENOLINK; | |
939 | ||
940 | features = vlan->dev->features; | |
941 | ||
942 | if (arg & TUN_F_CSUM) { | |
943 | feature_mask = NETIF_F_HW_CSUM; | |
944 | ||
945 | if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) { | |
946 | if (arg & TUN_F_TSO_ECN) | |
947 | feature_mask |= NETIF_F_TSO_ECN; | |
948 | if (arg & TUN_F_TSO4) | |
949 | feature_mask |= NETIF_F_TSO; | |
950 | if (arg & TUN_F_TSO6) | |
951 | feature_mask |= NETIF_F_TSO6; | |
952 | } | |
953 | ||
954 | if (arg & TUN_F_UFO) | |
955 | feature_mask |= NETIF_F_UFO; | |
956 | } | |
957 | ||
958 | /* tun/tap driver inverts the usage for TSO offloads, where | |
959 | * setting the TSO bit means that the userspace wants to | |
960 | * accept TSO frames and turning it off means that user space | |
961 | * does not support TSO. | |
962 | * For macvtap, we have to invert it to mean the same thing. | |
963 | * When user space turns off TSO, we turn off GSO/LRO so that | |
964 | * user-space will not receive TSO frames. | |
965 | */ | |
966 | if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO)) | |
967 | features |= RX_OFFLOADS; | |
968 | else | |
969 | features &= ~RX_OFFLOADS; | |
970 | ||
971 | /* tap_features are the same as features on tun/tap and | |
972 | * reflect user expectations. | |
973 | */ | |
a567dd62 | 974 | vlan->tap_features = feature_mask; |
2be5c767 VY |
975 | vlan->set_features = features; |
976 | netdev_update_features(vlan->dev); | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
20d29d7a AB |
981 | /* |
982 | * provide compatibility with generic tun/tap interface | |
983 | */ | |
984 | static long macvtap_ioctl(struct file *file, unsigned int cmd, | |
985 | unsigned long arg) | |
986 | { | |
02df55d2 AB |
987 | struct macvtap_queue *q = file->private_data; |
988 | struct macvlan_dev *vlan; | |
20d29d7a AB |
989 | void __user *argp = (void __user *)arg; |
990 | struct ifreq __user *ifr = argp; | |
991 | unsigned int __user *up = argp; | |
992 | unsigned int u; | |
55afbd08 MT |
993 | int __user *sp = argp; |
994 | int s; | |
02df55d2 | 995 | int ret; |
20d29d7a AB |
996 | |
997 | switch (cmd) { | |
998 | case TUNSETIFF: | |
999 | /* ignore the name, just look at flags */ | |
1000 | if (get_user(u, &ifr->ifr_flags)) | |
1001 | return -EFAULT; | |
b9fb9ee0 AB |
1002 | |
1003 | ret = 0; | |
815f236d JW |
1004 | if ((u & ~(IFF_VNET_HDR | IFF_MULTI_QUEUE)) != |
1005 | (IFF_NO_PI | IFF_TAP)) | |
b9fb9ee0 AB |
1006 | ret = -EINVAL; |
1007 | else | |
1008 | q->flags = u; | |
1009 | ||
1010 | return ret; | |
20d29d7a AB |
1011 | |
1012 | case TUNGETIFF: | |
441ac0fc | 1013 | rtnl_lock(); |
8f475a31 | 1014 | vlan = macvtap_get_vlan(q); |
441ac0fc VY |
1015 | if (!vlan) { |
1016 | rtnl_unlock(); | |
20d29d7a | 1017 | return -ENOLINK; |
441ac0fc | 1018 | } |
20d29d7a | 1019 | |
02df55d2 | 1020 | ret = 0; |
13707f9e | 1021 | if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) || |
b9fb9ee0 | 1022 | put_user(q->flags, &ifr->ifr_flags)) |
02df55d2 | 1023 | ret = -EFAULT; |
8f475a31 | 1024 | macvtap_put_vlan(vlan); |
441ac0fc | 1025 | rtnl_unlock(); |
02df55d2 | 1026 | return ret; |
20d29d7a | 1027 | |
815f236d JW |
1028 | case TUNSETQUEUE: |
1029 | if (get_user(u, &ifr->ifr_flags)) | |
1030 | return -EFAULT; | |
441ac0fc VY |
1031 | rtnl_lock(); |
1032 | ret = macvtap_ioctl_set_queue(file, u); | |
1033 | rtnl_unlock(); | |
82a19eb8 | 1034 | return ret; |
815f236d | 1035 | |
20d29d7a | 1036 | case TUNGETFEATURES: |
df09b36f JW |
1037 | if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR | |
1038 | IFF_MULTI_QUEUE, up)) | |
20d29d7a AB |
1039 | return -EFAULT; |
1040 | return 0; | |
1041 | ||
1042 | case TUNSETSNDBUF: | |
1043 | if (get_user(u, up)) | |
1044 | return -EFAULT; | |
1045 | ||
20d29d7a | 1046 | q->sk.sk_sndbuf = u; |
20d29d7a AB |
1047 | return 0; |
1048 | ||
55afbd08 MT |
1049 | case TUNGETVNETHDRSZ: |
1050 | s = q->vnet_hdr_sz; | |
1051 | if (put_user(s, sp)) | |
1052 | return -EFAULT; | |
1053 | return 0; | |
1054 | ||
1055 | case TUNSETVNETHDRSZ: | |
1056 | if (get_user(s, sp)) | |
1057 | return -EFAULT; | |
1058 | if (s < (int)sizeof(struct virtio_net_hdr)) | |
1059 | return -EINVAL; | |
1060 | ||
1061 | q->vnet_hdr_sz = s; | |
1062 | return 0; | |
1063 | ||
20d29d7a AB |
1064 | case TUNSETOFFLOAD: |
1065 | /* let the user check for future flags */ | |
1066 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
b9fb9ee0 | 1067 | TUN_F_TSO_ECN | TUN_F_UFO)) |
20d29d7a AB |
1068 | return -EINVAL; |
1069 | ||
2be5c767 VY |
1070 | rtnl_lock(); |
1071 | ret = set_offload(q, arg); | |
1072 | rtnl_unlock(); | |
1073 | return ret; | |
20d29d7a AB |
1074 | |
1075 | default: | |
1076 | return -EINVAL; | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | #ifdef CONFIG_COMPAT | |
1081 | static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, | |
1082 | unsigned long arg) | |
1083 | { | |
1084 | return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
1085 | } | |
1086 | #endif | |
1087 | ||
1088 | static const struct file_operations macvtap_fops = { | |
1089 | .owner = THIS_MODULE, | |
1090 | .open = macvtap_open, | |
1091 | .release = macvtap_release, | |
1092 | .aio_read = macvtap_aio_read, | |
1093 | .aio_write = macvtap_aio_write, | |
1094 | .poll = macvtap_poll, | |
1095 | .llseek = no_llseek, | |
1096 | .unlocked_ioctl = macvtap_ioctl, | |
1097 | #ifdef CONFIG_COMPAT | |
1098 | .compat_ioctl = macvtap_compat_ioctl, | |
1099 | #endif | |
1100 | }; | |
1101 | ||
501c774c AB |
1102 | static int macvtap_sendmsg(struct kiocb *iocb, struct socket *sock, |
1103 | struct msghdr *m, size_t total_len) | |
1104 | { | |
1105 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
97bc3633 | 1106 | return macvtap_get_user(q, m, m->msg_iov, total_len, m->msg_iovlen, |
501c774c AB |
1107 | m->msg_flags & MSG_DONTWAIT); |
1108 | } | |
1109 | ||
1110 | static int macvtap_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1111 | struct msghdr *m, size_t total_len, | |
1112 | int flags) | |
1113 | { | |
1114 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
1115 | int ret; | |
1116 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
1117 | return -EINVAL; | |
55ec8e25 | 1118 | ret = macvtap_do_read(q, m->msg_iov, total_len, |
501c774c | 1119 | flags & MSG_DONTWAIT); |
de2aa476 DM |
1120 | if (ret > total_len) { |
1121 | m->msg_flags |= MSG_TRUNC; | |
1122 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1123 | } | |
501c774c AB |
1124 | return ret; |
1125 | } | |
1126 | ||
1127 | /* Ops structure to mimic raw sockets with tun */ | |
1128 | static const struct proto_ops macvtap_socket_ops = { | |
1129 | .sendmsg = macvtap_sendmsg, | |
1130 | .recvmsg = macvtap_recvmsg, | |
1131 | }; | |
1132 | ||
1133 | /* Get an underlying socket object from tun file. Returns error unless file is | |
1134 | * attached to a device. The returned object works like a packet socket, it | |
1135 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1136 | * holding a reference to the file for as long as the socket is in use. */ | |
1137 | struct socket *macvtap_get_socket(struct file *file) | |
1138 | { | |
1139 | struct macvtap_queue *q; | |
1140 | if (file->f_op != &macvtap_fops) | |
1141 | return ERR_PTR(-EINVAL); | |
1142 | q = file->private_data; | |
1143 | if (!q) | |
1144 | return ERR_PTR(-EBADFD); | |
1145 | return &q->sock; | |
1146 | } | |
1147 | EXPORT_SYMBOL_GPL(macvtap_get_socket); | |
1148 | ||
9bf1907f EB |
1149 | static int macvtap_device_event(struct notifier_block *unused, |
1150 | unsigned long event, void *ptr) | |
1151 | { | |
351638e7 | 1152 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e09eff7f | 1153 | struct macvlan_dev *vlan; |
9bf1907f EB |
1154 | struct device *classdev; |
1155 | dev_t devt; | |
e09eff7f | 1156 | int err; |
9bf1907f EB |
1157 | |
1158 | if (dev->rtnl_link_ops != &macvtap_link_ops) | |
1159 | return NOTIFY_DONE; | |
1160 | ||
e09eff7f | 1161 | vlan = netdev_priv(dev); |
9bf1907f EB |
1162 | |
1163 | switch (event) { | |
1164 | case NETDEV_REGISTER: | |
1165 | /* Create the device node here after the network device has | |
1166 | * been registered but before register_netdevice has | |
1167 | * finished running. | |
1168 | */ | |
e09eff7f EB |
1169 | err = macvtap_get_minor(vlan); |
1170 | if (err) | |
1171 | return notifier_from_errno(err); | |
1172 | ||
1173 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); | |
9bf1907f EB |
1174 | classdev = device_create(macvtap_class, &dev->dev, devt, |
1175 | dev, "tap%d", dev->ifindex); | |
e09eff7f EB |
1176 | if (IS_ERR(classdev)) { |
1177 | macvtap_free_minor(vlan); | |
9bf1907f | 1178 | return notifier_from_errno(PTR_ERR(classdev)); |
e09eff7f | 1179 | } |
9bf1907f EB |
1180 | break; |
1181 | case NETDEV_UNREGISTER: | |
e09eff7f | 1182 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); |
9bf1907f | 1183 | device_destroy(macvtap_class, devt); |
e09eff7f | 1184 | macvtap_free_minor(vlan); |
9bf1907f EB |
1185 | break; |
1186 | } | |
1187 | ||
1188 | return NOTIFY_DONE; | |
1189 | } | |
1190 | ||
1191 | static struct notifier_block macvtap_notifier_block __read_mostly = { | |
1192 | .notifier_call = macvtap_device_event, | |
1193 | }; | |
1194 | ||
20d29d7a AB |
1195 | static int macvtap_init(void) |
1196 | { | |
1197 | int err; | |
1198 | ||
1199 | err = alloc_chrdev_region(&macvtap_major, 0, | |
1200 | MACVTAP_NUM_DEVS, "macvtap"); | |
1201 | if (err) | |
1202 | goto out1; | |
1203 | ||
1204 | cdev_init(&macvtap_cdev, &macvtap_fops); | |
1205 | err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); | |
1206 | if (err) | |
1207 | goto out2; | |
1208 | ||
1209 | macvtap_class = class_create(THIS_MODULE, "macvtap"); | |
1210 | if (IS_ERR(macvtap_class)) { | |
1211 | err = PTR_ERR(macvtap_class); | |
1212 | goto out3; | |
1213 | } | |
1214 | ||
9bf1907f | 1215 | err = register_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1216 | if (err) |
1217 | goto out4; | |
1218 | ||
9bf1907f EB |
1219 | err = macvlan_link_register(&macvtap_link_ops); |
1220 | if (err) | |
1221 | goto out5; | |
1222 | ||
20d29d7a AB |
1223 | return 0; |
1224 | ||
9bf1907f EB |
1225 | out5: |
1226 | unregister_netdevice_notifier(&macvtap_notifier_block); | |
20d29d7a AB |
1227 | out4: |
1228 | class_unregister(macvtap_class); | |
1229 | out3: | |
1230 | cdev_del(&macvtap_cdev); | |
1231 | out2: | |
1232 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1233 | out1: | |
1234 | return err; | |
1235 | } | |
1236 | module_init(macvtap_init); | |
1237 | ||
1238 | static void macvtap_exit(void) | |
1239 | { | |
1240 | rtnl_link_unregister(&macvtap_link_ops); | |
9bf1907f | 1241 | unregister_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1242 | class_unregister(macvtap_class); |
1243 | cdev_del(&macvtap_cdev); | |
1244 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1245 | } | |
1246 | module_exit(macvtap_exit); | |
1247 | ||
1248 | MODULE_ALIAS_RTNL_LINK("macvtap"); | |
1249 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
1250 | MODULE_LICENSE("GPL"); |