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 | 17 | #include <linux/fs.h> |
6c36d2e2 | 18 | #include <linux/uio.h> |
20d29d7a AB |
19 | |
20 | #include <net/net_namespace.h> | |
21 | #include <net/rtnetlink.h> | |
22 | #include <net/sock.h> | |
b9fb9ee0 | 23 | #include <linux/virtio_net.h> |
20d29d7a AB |
24 | |
25 | /* | |
26 | * A macvtap queue is the central object of this driver, it connects | |
27 | * an open character device to a macvlan interface. There can be | |
28 | * multiple queues on one interface, which map back to queues | |
29 | * implemented in hardware on the underlying device. | |
30 | * | |
31 | * macvtap_proto is used to allocate queues through the sock allocation | |
32 | * mechanism. | |
33 | * | |
20d29d7a AB |
34 | */ |
35 | struct macvtap_queue { | |
36 | struct sock sk; | |
37 | struct socket sock; | |
43815482 | 38 | struct socket_wq wq; |
55afbd08 | 39 | int vnet_hdr_sz; |
13707f9e | 40 | struct macvlan_dev __rcu *vlan; |
20d29d7a | 41 | struct file *file; |
b9fb9ee0 | 42 | unsigned int flags; |
376b1aab | 43 | u16 queue_index; |
815f236d JW |
44 | bool enabled; |
45 | struct list_head next; | |
20d29d7a AB |
46 | }; |
47 | ||
01b07fb3 MT |
48 | #define MACVTAP_FEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE) |
49 | ||
50 | #define MACVTAP_VNET_LE 0x80000000 | |
6ae7feb3 MT |
51 | |
52 | static inline u16 macvtap16_to_cpu(struct macvtap_queue *q, __virtio16 val) | |
53 | { | |
01b07fb3 | 54 | return __virtio16_to_cpu(q->flags & MACVTAP_VNET_LE, val); |
6ae7feb3 MT |
55 | } |
56 | ||
57 | static inline __virtio16 cpu_to_macvtap16(struct macvtap_queue *q, u16 val) | |
58 | { | |
01b07fb3 | 59 | return __cpu_to_virtio16(q->flags & MACVTAP_VNET_LE, val); |
6ae7feb3 MT |
60 | } |
61 | ||
20d29d7a AB |
62 | static struct proto macvtap_proto = { |
63 | .name = "macvtap", | |
64 | .owner = THIS_MODULE, | |
65 | .obj_size = sizeof (struct macvtap_queue), | |
66 | }; | |
67 | ||
68 | /* | |
e09eff7f | 69 | * Variables for dealing with macvtaps device numbers. |
20d29d7a | 70 | */ |
1ebed71a | 71 | static dev_t macvtap_major; |
e09eff7f EB |
72 | #define MACVTAP_NUM_DEVS (1U << MINORBITS) |
73 | static DEFINE_MUTEX(minor_lock); | |
74 | static DEFINE_IDR(minor_idr); | |
75 | ||
97bc3633 | 76 | #define GOODCOPY_LEN 128 |
20d29d7a AB |
77 | static struct class *macvtap_class; |
78 | static struct cdev macvtap_cdev; | |
79 | ||
501c774c AB |
80 | static const struct proto_ops macvtap_socket_ops; |
81 | ||
2be5c767 | 82 | #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ |
e3e3c423 | 83 | NETIF_F_TSO6 | NETIF_F_UFO) |
2be5c767 | 84 | #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO) |
a567dd62 VY |
85 | #define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG) |
86 | ||
6acf54f1 VY |
87 | static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev) |
88 | { | |
89 | return rcu_dereference(dev->rx_handler_data); | |
90 | } | |
91 | ||
20d29d7a AB |
92 | /* |
93 | * RCU usage: | |
02df55d2 AB |
94 | * The macvtap_queue and the macvlan_dev are loosely coupled, the |
95 | * pointers from one to the other can only be read while rcu_read_lock | |
441ac0fc | 96 | * or rtnl is held. |
20d29d7a | 97 | * |
02df55d2 AB |
98 | * Both the file and the macvlan_dev hold a reference on the macvtap_queue |
99 | * through sock_hold(&q->sk). When the macvlan_dev goes away first, | |
100 | * q->vlan becomes inaccessible. When the files gets closed, | |
101 | * macvtap_get_queue() fails. | |
20d29d7a | 102 | * |
02df55d2 AB |
103 | * There may still be references to the struct sock inside of the |
104 | * queue from outbound SKBs, but these never reference back to the | |
105 | * file or the dev. The data structure is freed through __sk_free | |
106 | * when both our references and any pending SKBs are gone. | |
20d29d7a | 107 | */ |
20d29d7a | 108 | |
815f236d | 109 | static int macvtap_enable_queue(struct net_device *dev, struct file *file, |
20d29d7a | 110 | struct macvtap_queue *q) |
815f236d JW |
111 | { |
112 | struct macvlan_dev *vlan = netdev_priv(dev); | |
113 | int err = -EINVAL; | |
114 | ||
441ac0fc | 115 | ASSERT_RTNL(); |
815f236d JW |
116 | |
117 | if (q->enabled) | |
118 | goto out; | |
119 | ||
120 | err = 0; | |
121 | rcu_assign_pointer(vlan->taps[vlan->numvtaps], q); | |
122 | q->queue_index = vlan->numvtaps; | |
123 | q->enabled = true; | |
124 | ||
125 | vlan->numvtaps++; | |
126 | out: | |
815f236d JW |
127 | return err; |
128 | } | |
129 | ||
40b8fe45 | 130 | /* Requires RTNL */ |
815f236d JW |
131 | static int macvtap_set_queue(struct net_device *dev, struct file *file, |
132 | struct macvtap_queue *q) | |
20d29d7a AB |
133 | { |
134 | struct macvlan_dev *vlan = netdev_priv(dev); | |
20d29d7a | 135 | |
815f236d | 136 | if (vlan->numqueues == MAX_MACVTAP_QUEUES) |
40b8fe45 | 137 | return -EBUSY; |
20d29d7a | 138 | |
02df55d2 | 139 | rcu_assign_pointer(q->vlan, vlan); |
376b1aab | 140 | rcu_assign_pointer(vlan->taps[vlan->numvtaps], q); |
02df55d2 | 141 | sock_hold(&q->sk); |
20d29d7a AB |
142 | |
143 | q->file = file; | |
376b1aab | 144 | q->queue_index = vlan->numvtaps; |
815f236d | 145 | q->enabled = true; |
02df55d2 | 146 | file->private_data = q; |
815f236d | 147 | list_add_tail(&q->next, &vlan->queue_list); |
20d29d7a | 148 | |
1565c7c1 | 149 | vlan->numvtaps++; |
815f236d | 150 | vlan->numqueues++; |
1565c7c1 | 151 | |
40b8fe45 | 152 | return 0; |
20d29d7a AB |
153 | } |
154 | ||
441ac0fc | 155 | static int macvtap_disable_queue(struct macvtap_queue *q) |
815f236d JW |
156 | { |
157 | struct macvlan_dev *vlan; | |
158 | struct macvtap_queue *nq; | |
159 | ||
441ac0fc | 160 | ASSERT_RTNL(); |
815f236d JW |
161 | if (!q->enabled) |
162 | return -EINVAL; | |
163 | ||
441ac0fc VY |
164 | vlan = rtnl_dereference(q->vlan); |
165 | ||
815f236d JW |
166 | if (vlan) { |
167 | int index = q->queue_index; | |
168 | BUG_ON(index >= vlan->numvtaps); | |
441ac0fc | 169 | nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]); |
815f236d JW |
170 | nq->queue_index = index; |
171 | ||
172 | rcu_assign_pointer(vlan->taps[index], nq); | |
173 | RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL); | |
174 | q->enabled = false; | |
175 | ||
176 | vlan->numvtaps--; | |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
20d29d7a | 182 | /* |
02df55d2 AB |
183 | * The file owning the queue got closed, give up both |
184 | * the reference that the files holds as well as the | |
185 | * one from the macvlan_dev if that still exists. | |
20d29d7a AB |
186 | * |
187 | * Using the spinlock makes sure that we don't get | |
188 | * to the queue again after destroying it. | |
20d29d7a | 189 | */ |
02df55d2 | 190 | static void macvtap_put_queue(struct macvtap_queue *q) |
20d29d7a | 191 | { |
02df55d2 | 192 | struct macvlan_dev *vlan; |
20d29d7a | 193 | |
441ac0fc VY |
194 | rtnl_lock(); |
195 | vlan = rtnl_dereference(q->vlan); | |
196 | ||
02df55d2 | 197 | if (vlan) { |
815f236d | 198 | if (q->enabled) |
441ac0fc | 199 | BUG_ON(macvtap_disable_queue(q)); |
376b1aab | 200 | |
815f236d | 201 | vlan->numqueues--; |
2cfa5a04 | 202 | RCU_INIT_POINTER(q->vlan, NULL); |
02df55d2 | 203 | sock_put(&q->sk); |
815f236d | 204 | list_del_init(&q->next); |
20d29d7a AB |
205 | } |
206 | ||
441ac0fc | 207 | rtnl_unlock(); |
20d29d7a AB |
208 | |
209 | synchronize_rcu(); | |
210 | sock_put(&q->sk); | |
211 | } | |
212 | ||
213 | /* | |
1565c7c1 KK |
214 | * Select a queue based on the rxq of the device on which this packet |
215 | * arrived. If the incoming device is not mq, calculate a flow hash | |
216 | * to select a queue. If all fails, find the first available queue. | |
217 | * Cache vlan->numvtaps since it can become zero during the execution | |
218 | * of this function. | |
20d29d7a AB |
219 | */ |
220 | static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, | |
221 | struct sk_buff *skb) | |
222 | { | |
223 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 | 224 | struct macvtap_queue *tap = NULL; |
815f236d JW |
225 | /* Access to taps array is protected by rcu, but access to numvtaps |
226 | * isn't. Below we use it to lookup a queue, but treat it as a hint | |
227 | * and validate that the result isn't NULL - in case we are | |
228 | * racing against queue removal. | |
229 | */ | |
ed0483fa | 230 | int numvtaps = ACCESS_ONCE(vlan->numvtaps); |
1565c7c1 KK |
231 | __u32 rxq; |
232 | ||
233 | if (!numvtaps) | |
234 | goto out; | |
235 | ||
ef0002b5 | 236 | /* Check if we can use flow to select a queue */ |
3958afa1 | 237 | rxq = skb_get_hash(skb); |
ef0002b5 KK |
238 | if (rxq) { |
239 | tap = rcu_dereference(vlan->taps[rxq % numvtaps]); | |
376b1aab | 240 | goto out; |
ef0002b5 KK |
241 | } |
242 | ||
1565c7c1 KK |
243 | if (likely(skb_rx_queue_recorded(skb))) { |
244 | rxq = skb_get_rx_queue(skb); | |
20d29d7a | 245 | |
1565c7c1 KK |
246 | while (unlikely(rxq >= numvtaps)) |
247 | rxq -= numvtaps; | |
248 | ||
249 | tap = rcu_dereference(vlan->taps[rxq]); | |
376b1aab | 250 | goto out; |
1565c7c1 KK |
251 | } |
252 | ||
376b1aab | 253 | tap = rcu_dereference(vlan->taps[0]); |
1565c7c1 KK |
254 | out: |
255 | return tap; | |
20d29d7a AB |
256 | } |
257 | ||
02df55d2 AB |
258 | /* |
259 | * The net_device is going away, give up the reference | |
1565c7c1 KK |
260 | * that it holds on all queues and safely set the pointer |
261 | * from the queues to NULL. | |
02df55d2 | 262 | */ |
20d29d7a AB |
263 | static void macvtap_del_queues(struct net_device *dev) |
264 | { | |
265 | struct macvlan_dev *vlan = netdev_priv(dev); | |
815f236d | 266 | struct macvtap_queue *q, *tmp, *qlist[MAX_MACVTAP_QUEUES]; |
1565c7c1 | 267 | int i, j = 0; |
02df55d2 | 268 | |
441ac0fc | 269 | ASSERT_RTNL(); |
815f236d JW |
270 | list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) { |
271 | list_del_init(&q->next); | |
376b1aab | 272 | qlist[j++] = q; |
376b1aab | 273 | RCU_INIT_POINTER(q->vlan, NULL); |
815f236d JW |
274 | if (q->enabled) |
275 | vlan->numvtaps--; | |
276 | vlan->numqueues--; | |
564517e8 | 277 | } |
815f236d JW |
278 | for (i = 0; i < vlan->numvtaps; i++) |
279 | RCU_INIT_POINTER(vlan->taps[i], NULL); | |
280 | BUG_ON(vlan->numvtaps); | |
281 | BUG_ON(vlan->numqueues); | |
99f34b38 EB |
282 | /* guarantee that any future macvtap_set_queue will fail */ |
283 | vlan->numvtaps = MAX_MACVTAP_QUEUES; | |
1565c7c1 KK |
284 | |
285 | for (--j; j >= 0; j--) | |
286 | sock_put(&qlist[j]->sk); | |
20d29d7a AB |
287 | } |
288 | ||
6acf54f1 | 289 | static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb) |
20d29d7a | 290 | { |
6acf54f1 VY |
291 | struct sk_buff *skb = *pskb; |
292 | struct net_device *dev = skb->dev; | |
293 | struct macvlan_dev *vlan; | |
294 | struct macvtap_queue *q; | |
a567dd62 VY |
295 | netdev_features_t features = TAP_FEATURES; |
296 | ||
6acf54f1 VY |
297 | vlan = macvtap_get_vlan_rcu(dev); |
298 | if (!vlan) | |
299 | return RX_HANDLER_PASS; | |
300 | ||
301 | q = macvtap_get_queue(dev, skb); | |
20d29d7a | 302 | if (!q) |
6acf54f1 | 303 | return RX_HANDLER_PASS; |
8a35747a HX |
304 | |
305 | if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len) | |
306 | goto drop; | |
20d29d7a | 307 | |
6acf54f1 VY |
308 | skb_push(skb, ETH_HLEN); |
309 | ||
3e4f8b78 | 310 | /* Apply the forward feature mask so that we perform segmentation |
e5733321 VY |
311 | * according to users wishes. This only works if VNET_HDR is |
312 | * enabled. | |
3e4f8b78 | 313 | */ |
e5733321 VY |
314 | if (q->flags & IFF_VNET_HDR) |
315 | features |= vlan->tap_features; | |
8b86a61d | 316 | if (netif_needs_gso(skb, features)) { |
3e4f8b78 VY |
317 | struct sk_buff *segs = __skb_gso_segment(skb, features, false); |
318 | ||
319 | if (IS_ERR(segs)) | |
320 | goto drop; | |
321 | ||
322 | if (!segs) { | |
323 | skb_queue_tail(&q->sk.sk_receive_queue, skb); | |
324 | goto wake_up; | |
325 | } | |
326 | ||
327 | kfree_skb(skb); | |
328 | while (segs) { | |
329 | struct sk_buff *nskb = segs->next; | |
330 | ||
331 | segs->next = NULL; | |
332 | skb_queue_tail(&q->sk.sk_receive_queue, segs); | |
333 | segs = nskb; | |
334 | } | |
335 | } else { | |
cbdb0427 VY |
336 | /* If we receive a partial checksum and the tap side |
337 | * doesn't support checksum offload, compute the checksum. | |
338 | * Note: it doesn't matter which checksum feature to | |
339 | * check, we either support them all or none. | |
340 | */ | |
341 | if (skb->ip_summed == CHECKSUM_PARTIAL && | |
342 | !(features & NETIF_F_ALL_CSUM) && | |
343 | skb_checksum_help(skb)) | |
344 | goto drop; | |
3e4f8b78 VY |
345 | skb_queue_tail(&q->sk.sk_receive_queue, skb); |
346 | } | |
347 | ||
348 | wake_up: | |
4a4771a5 | 349 | wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND); |
6acf54f1 | 350 | return RX_HANDLER_CONSUMED; |
8a35747a HX |
351 | |
352 | drop: | |
6acf54f1 VY |
353 | /* Count errors/drops only here, thus don't care about args. */ |
354 | macvlan_count_rx(vlan, 0, 0, 0); | |
8a35747a | 355 | kfree_skb(skb); |
6acf54f1 | 356 | return RX_HANDLER_CONSUMED; |
20d29d7a AB |
357 | } |
358 | ||
e09eff7f EB |
359 | static int macvtap_get_minor(struct macvlan_dev *vlan) |
360 | { | |
361 | int retval = -ENOMEM; | |
e09eff7f EB |
362 | |
363 | mutex_lock(&minor_lock); | |
ec09ebc1 TH |
364 | retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL); |
365 | if (retval >= 0) { | |
366 | vlan->minor = retval; | |
367 | } else if (retval == -ENOSPC) { | |
e09eff7f EB |
368 | printk(KERN_ERR "too many macvtap devices\n"); |
369 | retval = -EINVAL; | |
e09eff7f | 370 | } |
e09eff7f | 371 | mutex_unlock(&minor_lock); |
ec09ebc1 | 372 | return retval < 0 ? retval : 0; |
e09eff7f EB |
373 | } |
374 | ||
375 | static void macvtap_free_minor(struct macvlan_dev *vlan) | |
376 | { | |
377 | mutex_lock(&minor_lock); | |
378 | if (vlan->minor) { | |
379 | idr_remove(&minor_idr, vlan->minor); | |
380 | vlan->minor = 0; | |
381 | } | |
382 | mutex_unlock(&minor_lock); | |
383 | } | |
384 | ||
385 | static struct net_device *dev_get_by_macvtap_minor(int minor) | |
386 | { | |
387 | struct net_device *dev = NULL; | |
388 | struct macvlan_dev *vlan; | |
389 | ||
390 | mutex_lock(&minor_lock); | |
391 | vlan = idr_find(&minor_idr, minor); | |
392 | if (vlan) { | |
393 | dev = vlan->dev; | |
394 | dev_hold(dev); | |
395 | } | |
396 | mutex_unlock(&minor_lock); | |
397 | return dev; | |
398 | } | |
399 | ||
20d29d7a AB |
400 | static int macvtap_newlink(struct net *src_net, |
401 | struct net_device *dev, | |
402 | struct nlattr *tb[], | |
403 | struct nlattr *data[]) | |
404 | { | |
815f236d | 405 | struct macvlan_dev *vlan = netdev_priv(dev); |
6acf54f1 VY |
406 | int err; |
407 | ||
815f236d JW |
408 | INIT_LIST_HEAD(&vlan->queue_list); |
409 | ||
2be5c767 VY |
410 | /* Since macvlan supports all offloads by default, make |
411 | * tap support all offloads also. | |
412 | */ | |
413 | vlan->tap_features = TUN_OFFLOADS; | |
414 | ||
6acf54f1 VY |
415 | err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan); |
416 | if (err) | |
417 | return err; | |
418 | ||
9bf1907f EB |
419 | /* Don't put anything that may fail after macvlan_common_newlink |
420 | * because we can't undo what it does. | |
421 | */ | |
2f6a1b66 | 422 | return macvlan_common_newlink(src_net, dev, tb, data); |
20d29d7a AB |
423 | } |
424 | ||
425 | static void macvtap_dellink(struct net_device *dev, | |
426 | struct list_head *head) | |
427 | { | |
6acf54f1 | 428 | netdev_rx_handler_unregister(dev); |
20d29d7a AB |
429 | macvtap_del_queues(dev); |
430 | macvlan_dellink(dev, head); | |
431 | } | |
432 | ||
8a35747a HX |
433 | static void macvtap_setup(struct net_device *dev) |
434 | { | |
435 | macvlan_common_setup(dev); | |
436 | dev->tx_queue_len = TUN_READQ_SIZE; | |
437 | } | |
438 | ||
20d29d7a AB |
439 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { |
440 | .kind = "macvtap", | |
8a35747a | 441 | .setup = macvtap_setup, |
20d29d7a AB |
442 | .newlink = macvtap_newlink, |
443 | .dellink = macvtap_dellink, | |
444 | }; | |
445 | ||
446 | ||
447 | static void macvtap_sock_write_space(struct sock *sk) | |
448 | { | |
43815482 ED |
449 | wait_queue_head_t *wqueue; |
450 | ||
20d29d7a AB |
451 | if (!sock_writeable(sk) || |
452 | !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
453 | return; | |
454 | ||
43815482 ED |
455 | wqueue = sk_sleep(sk); |
456 | if (wqueue && waitqueue_active(wqueue)) | |
457 | wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND); | |
20d29d7a AB |
458 | } |
459 | ||
2259fef0 EB |
460 | static void macvtap_sock_destruct(struct sock *sk) |
461 | { | |
462 | skb_queue_purge(&sk->sk_receive_queue); | |
463 | } | |
464 | ||
20d29d7a AB |
465 | static int macvtap_open(struct inode *inode, struct file *file) |
466 | { | |
467 | struct net *net = current->nsproxy->net_ns; | |
40b8fe45 | 468 | struct net_device *dev; |
20d29d7a | 469 | struct macvtap_queue *q; |
40b8fe45 | 470 | int err = -ENODEV; |
20d29d7a | 471 | |
40b8fe45 VY |
472 | rtnl_lock(); |
473 | dev = dev_get_by_macvtap_minor(iminor(inode)); | |
20d29d7a AB |
474 | if (!dev) |
475 | goto out; | |
476 | ||
20d29d7a AB |
477 | err = -ENOMEM; |
478 | q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, | |
479 | &macvtap_proto); | |
480 | if (!q) | |
481 | goto out; | |
482 | ||
d9a90a31 | 483 | RCU_INIT_POINTER(q->sock.wq, &q->wq); |
43815482 | 484 | init_waitqueue_head(&q->wq.wait); |
20d29d7a AB |
485 | q->sock.type = SOCK_RAW; |
486 | q->sock.state = SS_CONNECTED; | |
501c774c AB |
487 | q->sock.file = file; |
488 | q->sock.ops = &macvtap_socket_ops; | |
20d29d7a | 489 | sock_init_data(&q->sock, &q->sk); |
20d29d7a | 490 | q->sk.sk_write_space = macvtap_sock_write_space; |
2259fef0 | 491 | q->sk.sk_destruct = macvtap_sock_destruct; |
b9fb9ee0 | 492 | q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; |
55afbd08 | 493 | q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
20d29d7a | 494 | |
97bc3633 SM |
495 | /* |
496 | * so far only KVM virtio_net uses macvtap, enable zero copy between | |
497 | * guest kernel and host kernel when lower device supports zerocopy | |
047af9cf EB |
498 | * |
499 | * The macvlan supports zerocopy iff the lower device supports zero | |
500 | * copy so we don't have to look at the lower device directly. | |
97bc3633 | 501 | */ |
047af9cf EB |
502 | if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG)) |
503 | sock_set_flag(&q->sk, SOCK_ZEROCOPY); | |
97bc3633 | 504 | |
20d29d7a AB |
505 | err = macvtap_set_queue(dev, file, q); |
506 | if (err) | |
507 | sock_put(&q->sk); | |
508 | ||
509 | out: | |
510 | if (dev) | |
511 | dev_put(dev); | |
512 | ||
40b8fe45 | 513 | rtnl_unlock(); |
20d29d7a AB |
514 | return err; |
515 | } | |
516 | ||
517 | static int macvtap_release(struct inode *inode, struct file *file) | |
518 | { | |
02df55d2 AB |
519 | struct macvtap_queue *q = file->private_data; |
520 | macvtap_put_queue(q); | |
20d29d7a AB |
521 | return 0; |
522 | } | |
523 | ||
524 | static unsigned int macvtap_poll(struct file *file, poll_table * wait) | |
525 | { | |
02df55d2 | 526 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
527 | unsigned int mask = POLLERR; |
528 | ||
529 | if (!q) | |
530 | goto out; | |
531 | ||
532 | mask = 0; | |
43815482 | 533 | poll_wait(file, &q->wq.wait, wait); |
20d29d7a AB |
534 | |
535 | if (!skb_queue_empty(&q->sk.sk_receive_queue)) | |
536 | mask |= POLLIN | POLLRDNORM; | |
537 | ||
538 | if (sock_writeable(&q->sk) || | |
539 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) && | |
540 | sock_writeable(&q->sk))) | |
541 | mask |= POLLOUT | POLLWRNORM; | |
542 | ||
543 | out: | |
20d29d7a AB |
544 | return mask; |
545 | } | |
546 | ||
b9fb9ee0 AB |
547 | static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, |
548 | size_t len, size_t linear, | |
549 | int noblock, int *err) | |
550 | { | |
551 | struct sk_buff *skb; | |
552 | ||
553 | /* Under a page? Don't bother with paged skb. */ | |
554 | if (prepad + len < PAGE_SIZE || !linear) | |
555 | linear = len; | |
556 | ||
557 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
28d64271 | 558 | err, 0); |
b9fb9ee0 AB |
559 | if (!skb) |
560 | return NULL; | |
561 | ||
562 | skb_reserve(skb, prepad); | |
563 | skb_put(skb, linear); | |
564 | skb->data_len = len - linear; | |
565 | skb->len += len - linear; | |
566 | ||
567 | return skb; | |
568 | } | |
569 | ||
570 | /* | |
571 | * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should | |
572 | * be shared with the tun/tap driver. | |
573 | */ | |
6ae7feb3 MT |
574 | static int macvtap_skb_from_vnet_hdr(struct macvtap_queue *q, |
575 | struct sk_buff *skb, | |
b9fb9ee0 AB |
576 | struct virtio_net_hdr *vnet_hdr) |
577 | { | |
578 | unsigned short gso_type = 0; | |
579 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
580 | switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
581 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
582 | gso_type = SKB_GSO_TCPV4; | |
583 | break; | |
584 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
585 | gso_type = SKB_GSO_TCPV6; | |
586 | break; | |
587 | case VIRTIO_NET_HDR_GSO_UDP: | |
588 | gso_type = SKB_GSO_UDP; | |
589 | break; | |
590 | default: | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
595 | gso_type |= SKB_GSO_TCP_ECN; | |
596 | ||
597 | if (vnet_hdr->gso_size == 0) | |
598 | return -EINVAL; | |
599 | } | |
600 | ||
601 | if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
6ae7feb3 MT |
602 | if (!skb_partial_csum_set(skb, macvtap16_to_cpu(q, vnet_hdr->csum_start), |
603 | macvtap16_to_cpu(q, vnet_hdr->csum_offset))) | |
b9fb9ee0 AB |
604 | return -EINVAL; |
605 | } | |
606 | ||
607 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
6ae7feb3 | 608 | skb_shinfo(skb)->gso_size = macvtap16_to_cpu(q, vnet_hdr->gso_size); |
c9af6db4 | 609 | skb_shinfo(skb)->gso_type = gso_type; |
b9fb9ee0 AB |
610 | |
611 | /* Header must be checked, and gso_segs computed. */ | |
612 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
613 | skb_shinfo(skb)->gso_segs = 0; | |
614 | } | |
615 | return 0; | |
616 | } | |
617 | ||
6ae7feb3 MT |
618 | static void macvtap_skb_to_vnet_hdr(struct macvtap_queue *q, |
619 | const struct sk_buff *skb, | |
620 | struct virtio_net_hdr *vnet_hdr) | |
b9fb9ee0 AB |
621 | { |
622 | memset(vnet_hdr, 0, sizeof(*vnet_hdr)); | |
623 | ||
624 | if (skb_is_gso(skb)) { | |
625 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
626 | ||
627 | /* This is a hint as to how much should be linear. */ | |
6ae7feb3 MT |
628 | vnet_hdr->hdr_len = cpu_to_macvtap16(q, skb_headlen(skb)); |
629 | vnet_hdr->gso_size = cpu_to_macvtap16(q, sinfo->gso_size); | |
b9fb9ee0 AB |
630 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
631 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
632 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
633 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e3e3c423 VY |
634 | else if (sinfo->gso_type & SKB_GSO_UDP) |
635 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
b9fb9ee0 AB |
636 | else |
637 | BUG(); | |
638 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
639 | vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
640 | } else | |
641 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
642 | ||
643 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
644 | vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
df8a39de | 645 | if (skb_vlan_tag_present(skb)) |
6ae7feb3 MT |
646 | vnet_hdr->csum_start = cpu_to_macvtap16(q, |
647 | skb_checksum_start_offset(skb) + VLAN_HLEN); | |
648 | else | |
649 | vnet_hdr->csum_start = cpu_to_macvtap16(q, | |
650 | skb_checksum_start_offset(skb)); | |
651 | vnet_hdr->csum_offset = cpu_to_macvtap16(q, skb->csum_offset); | |
10a8d94a JW |
652 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
653 | vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
b9fb9ee0 | 654 | } /* else everything is zero */ |
b9fb9ee0 AB |
655 | } |
656 | ||
2f1d8b9e ED |
657 | /* Neighbour code has some assumptions on HH_DATA_MOD alignment */ |
658 | #define MACVTAP_RESERVE HH_DATA_OFF(ETH_HLEN) | |
659 | ||
20d29d7a | 660 | /* Get packet from user space buffer */ |
97bc3633 | 661 | static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, |
f5ff53b4 | 662 | struct iov_iter *from, int noblock) |
20d29d7a | 663 | { |
2f1d8b9e | 664 | int good_linear = SKB_MAX_HEAD(MACVTAP_RESERVE); |
20d29d7a | 665 | struct sk_buff *skb; |
02df55d2 | 666 | struct macvlan_dev *vlan; |
f5ff53b4 | 667 | unsigned long total_len = iov_iter_count(from); |
97bc3633 | 668 | unsigned long len = total_len; |
20d29d7a | 669 | int err; |
b9fb9ee0 AB |
670 | struct virtio_net_hdr vnet_hdr = { 0 }; |
671 | int vnet_hdr_len = 0; | |
b92946e2 | 672 | int copylen = 0; |
97bc3633 | 673 | bool zerocopy = false; |
61d46bf9 | 674 | size_t linear; |
f5ff53b4 | 675 | ssize_t n; |
b9fb9ee0 AB |
676 | |
677 | if (q->flags & IFF_VNET_HDR) { | |
55afbd08 | 678 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
679 | |
680 | err = -EINVAL; | |
ce3c8692 | 681 | if (len < vnet_hdr_len) |
b9fb9ee0 | 682 | goto err; |
ce3c8692 | 683 | len -= vnet_hdr_len; |
b9fb9ee0 | 684 | |
f5ff53b4 AV |
685 | err = -EFAULT; |
686 | n = copy_from_iter(&vnet_hdr, sizeof(vnet_hdr), from); | |
687 | if (n != sizeof(vnet_hdr)) | |
b9fb9ee0 | 688 | goto err; |
f5ff53b4 | 689 | iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr)); |
b9fb9ee0 | 690 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
6ae7feb3 MT |
691 | macvtap16_to_cpu(q, vnet_hdr.csum_start) + |
692 | macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2 > | |
693 | macvtap16_to_cpu(q, vnet_hdr.hdr_len)) | |
694 | vnet_hdr.hdr_len = cpu_to_macvtap16(q, | |
695 | macvtap16_to_cpu(q, vnet_hdr.csum_start) + | |
696 | macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2); | |
b9fb9ee0 | 697 | err = -EINVAL; |
6ae7feb3 | 698 | if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > len) |
b9fb9ee0 AB |
699 | goto err; |
700 | } | |
20d29d7a | 701 | |
b9fb9ee0 | 702 | err = -EINVAL; |
20d29d7a | 703 | if (unlikely(len < ETH_HLEN)) |
b9fb9ee0 | 704 | goto err; |
20d29d7a | 705 | |
ece793fc | 706 | if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) { |
f5ff53b4 AV |
707 | struct iov_iter i; |
708 | ||
6ae7feb3 MT |
709 | copylen = vnet_hdr.hdr_len ? |
710 | macvtap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN; | |
16a3fa28 JW |
711 | if (copylen > good_linear) |
712 | copylen = good_linear; | |
61d46bf9 | 713 | linear = copylen; |
f5ff53b4 AV |
714 | i = *from; |
715 | iov_iter_advance(&i, copylen); | |
716 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
ece793fc JW |
717 | zerocopy = true; |
718 | } | |
719 | ||
720 | if (!zerocopy) { | |
97bc3633 | 721 | copylen = len; |
6ae7feb3 | 722 | if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > good_linear) |
16a3fa28 JW |
723 | linear = good_linear; |
724 | else | |
6ae7feb3 | 725 | linear = macvtap16_to_cpu(q, vnet_hdr.hdr_len); |
61d46bf9 | 726 | } |
97bc3633 | 727 | |
2f1d8b9e | 728 | skb = macvtap_alloc_skb(&q->sk, MACVTAP_RESERVE, copylen, |
61d46bf9 | 729 | linear, noblock, &err); |
02df55d2 AB |
730 | if (!skb) |
731 | goto err; | |
20d29d7a | 732 | |
01d6657b | 733 | if (zerocopy) |
f5ff53b4 | 734 | err = zerocopy_sg_from_iter(skb, from); |
ece793fc | 735 | else { |
f5ff53b4 | 736 | err = skb_copy_datagram_from_iter(skb, 0, from, len); |
ece793fc JW |
737 | if (!err && m && m->msg_control) { |
738 | struct ubuf_info *uarg = m->msg_control; | |
739 | uarg->callback(uarg, false); | |
740 | } | |
741 | } | |
742 | ||
02df55d2 | 743 | if (err) |
b9fb9ee0 | 744 | goto err_kfree; |
20d29d7a AB |
745 | |
746 | skb_set_network_header(skb, ETH_HLEN); | |
b9fb9ee0 AB |
747 | skb_reset_mac_header(skb); |
748 | skb->protocol = eth_hdr(skb)->h_proto; | |
749 | ||
750 | if (vnet_hdr_len) { | |
6ae7feb3 | 751 | err = macvtap_skb_from_vnet_hdr(q, skb, &vnet_hdr); |
b9fb9ee0 AB |
752 | if (err) |
753 | goto err_kfree; | |
754 | } | |
755 | ||
40893fd0 | 756 | skb_probe_transport_header(skb, ETH_HLEN); |
9b4d669b | 757 | |
ac4e4af1 VY |
758 | rcu_read_lock(); |
759 | vlan = rcu_dereference(q->vlan); | |
97bc3633 | 760 | /* copy skb_ubuf_info for callback when skb has no error */ |
01d6657b | 761 | if (zerocopy) { |
97bc3633 | 762 | skb_shinfo(skb)->destructor_arg = m->msg_control; |
01d6657b | 763 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; |
c9af6db4 | 764 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
01d6657b | 765 | } |
29d79196 | 766 | if (vlan) { |
6acf54f1 VY |
767 | skb->dev = vlan->dev; |
768 | dev_queue_xmit(skb); | |
29d79196 | 769 | } else { |
02df55d2 | 770 | kfree_skb(skb); |
29d79196 | 771 | } |
ac4e4af1 | 772 | rcu_read_unlock(); |
20d29d7a | 773 | |
97bc3633 | 774 | return total_len; |
02df55d2 | 775 | |
b9fb9ee0 AB |
776 | err_kfree: |
777 | kfree_skb(skb); | |
778 | ||
02df55d2 | 779 | err: |
ac4e4af1 VY |
780 | rcu_read_lock(); |
781 | vlan = rcu_dereference(q->vlan); | |
02df55d2 | 782 | if (vlan) |
cd3e22b7 | 783 | this_cpu_inc(vlan->pcpu_stats->tx_dropped); |
ac4e4af1 | 784 | rcu_read_unlock(); |
02df55d2 | 785 | |
02df55d2 | 786 | return err; |
20d29d7a AB |
787 | } |
788 | ||
f5ff53b4 | 789 | static ssize_t macvtap_write_iter(struct kiocb *iocb, struct iov_iter *from) |
20d29d7a AB |
790 | { |
791 | struct file *file = iocb->ki_filp; | |
02df55d2 | 792 | struct macvtap_queue *q = file->private_data; |
20d29d7a | 793 | |
f5ff53b4 | 794 | return macvtap_get_user(q, NULL, from, file->f_flags & O_NONBLOCK); |
20d29d7a AB |
795 | } |
796 | ||
797 | /* Put packet to the user space buffer */ | |
798 | static ssize_t macvtap_put_user(struct macvtap_queue *q, | |
799 | const struct sk_buff *skb, | |
6c36d2e2 | 800 | struct iov_iter *iter) |
20d29d7a | 801 | { |
20d29d7a | 802 | int ret; |
b9fb9ee0 | 803 | int vnet_hdr_len = 0; |
f09e2249 | 804 | int vlan_offset = 0; |
6c36d2e2 | 805 | int total; |
b9fb9ee0 AB |
806 | |
807 | if (q->flags & IFF_VNET_HDR) { | |
808 | struct virtio_net_hdr vnet_hdr; | |
55afbd08 | 809 | vnet_hdr_len = q->vnet_hdr_sz; |
6c36d2e2 | 810 | if (iov_iter_count(iter) < vnet_hdr_len) |
b9fb9ee0 AB |
811 | return -EINVAL; |
812 | ||
6ae7feb3 | 813 | macvtap_skb_to_vnet_hdr(q, skb, &vnet_hdr); |
b9fb9ee0 | 814 | |
6c36d2e2 HX |
815 | if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) != |
816 | sizeof(vnet_hdr)) | |
b9fb9ee0 | 817 | return -EFAULT; |
7cc76f51 JW |
818 | |
819 | iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr)); | |
b9fb9ee0 | 820 | } |
6c36d2e2 | 821 | total = vnet_hdr_len; |
ce232ce0 | 822 | total += skb->len; |
f09e2249 | 823 | |
df8a39de | 824 | if (skb_vlan_tag_present(skb)) { |
f09e2249 BG |
825 | struct { |
826 | __be16 h_vlan_proto; | |
827 | __be16 h_vlan_TCI; | |
828 | } veth; | |
0fbe0d47 | 829 | veth.h_vlan_proto = skb->vlan_proto; |
df8a39de | 830 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
f09e2249 BG |
831 | |
832 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
ce232ce0 | 833 | total += VLAN_HLEN; |
f09e2249 | 834 | |
6c36d2e2 HX |
835 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
836 | if (ret || !iov_iter_count(iter)) | |
f09e2249 BG |
837 | goto done; |
838 | ||
6c36d2e2 HX |
839 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
840 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
f09e2249 BG |
841 | goto done; |
842 | } | |
20d29d7a | 843 | |
6c36d2e2 HX |
844 | ret = skb_copy_datagram_iter(skb, vlan_offset, iter, |
845 | skb->len - vlan_offset); | |
20d29d7a | 846 | |
f09e2249 | 847 | done: |
ce232ce0 | 848 | return ret ? ret : total; |
20d29d7a AB |
849 | } |
850 | ||
55ec8e25 | 851 | static ssize_t macvtap_do_read(struct macvtap_queue *q, |
3af0bfe5 | 852 | struct iov_iter *to, |
501c774c | 853 | int noblock) |
20d29d7a | 854 | { |
ccf7e72b | 855 | DEFINE_WAIT(wait); |
20d29d7a | 856 | struct sk_buff *skb; |
501c774c | 857 | ssize_t ret = 0; |
20d29d7a | 858 | |
3af0bfe5 AV |
859 | if (!iov_iter_count(to)) |
860 | return 0; | |
861 | ||
862 | while (1) { | |
89cee917 JW |
863 | if (!noblock) |
864 | prepare_to_wait(sk_sleep(&q->sk), &wait, | |
865 | TASK_INTERRUPTIBLE); | |
20d29d7a AB |
866 | |
867 | /* Read frames from the queue */ | |
868 | skb = skb_dequeue(&q->sk.sk_receive_queue); | |
3af0bfe5 AV |
869 | if (skb) |
870 | break; | |
871 | if (noblock) { | |
872 | ret = -EAGAIN; | |
873 | break; | |
20d29d7a | 874 | } |
3af0bfe5 AV |
875 | if (signal_pending(current)) { |
876 | ret = -ERESTARTSYS; | |
877 | break; | |
878 | } | |
879 | /* Nothing to read, let's sleep */ | |
880 | schedule(); | |
881 | } | |
882 | if (skb) { | |
883 | ret = macvtap_put_user(q, skb, to); | |
f51a5e82 JW |
884 | if (unlikely(ret < 0)) |
885 | kfree_skb(skb); | |
886 | else | |
887 | consume_skb(skb); | |
20d29d7a | 888 | } |
89cee917 JW |
889 | if (!noblock) |
890 | finish_wait(sk_sleep(&q->sk), &wait); | |
501c774c AB |
891 | return ret; |
892 | } | |
893 | ||
3af0bfe5 | 894 | static ssize_t macvtap_read_iter(struct kiocb *iocb, struct iov_iter *to) |
501c774c AB |
895 | { |
896 | struct file *file = iocb->ki_filp; | |
897 | struct macvtap_queue *q = file->private_data; | |
3af0bfe5 | 898 | ssize_t len = iov_iter_count(to), ret; |
20d29d7a | 899 | |
3af0bfe5 | 900 | ret = macvtap_do_read(q, to, file->f_flags & O_NONBLOCK); |
ce232ce0 | 901 | ret = min_t(ssize_t, ret, len); |
e6ebc7f1 ZYW |
902 | if (ret > 0) |
903 | iocb->ki_pos = ret; | |
20d29d7a AB |
904 | return ret; |
905 | } | |
906 | ||
8f475a31 JW |
907 | static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q) |
908 | { | |
909 | struct macvlan_dev *vlan; | |
910 | ||
441ac0fc VY |
911 | ASSERT_RTNL(); |
912 | vlan = rtnl_dereference(q->vlan); | |
8f475a31 JW |
913 | if (vlan) |
914 | dev_hold(vlan->dev); | |
8f475a31 JW |
915 | |
916 | return vlan; | |
917 | } | |
918 | ||
919 | static void macvtap_put_vlan(struct macvlan_dev *vlan) | |
920 | { | |
921 | dev_put(vlan->dev); | |
922 | } | |
923 | ||
815f236d JW |
924 | static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags) |
925 | { | |
926 | struct macvtap_queue *q = file->private_data; | |
927 | struct macvlan_dev *vlan; | |
928 | int ret; | |
929 | ||
930 | vlan = macvtap_get_vlan(q); | |
931 | if (!vlan) | |
932 | return -EINVAL; | |
933 | ||
934 | if (flags & IFF_ATTACH_QUEUE) | |
935 | ret = macvtap_enable_queue(vlan->dev, file, q); | |
936 | else if (flags & IFF_DETACH_QUEUE) | |
937 | ret = macvtap_disable_queue(q); | |
f57855a5 JW |
938 | else |
939 | ret = -EINVAL; | |
815f236d JW |
940 | |
941 | macvtap_put_vlan(vlan); | |
942 | return ret; | |
943 | } | |
944 | ||
2be5c767 VY |
945 | static int set_offload(struct macvtap_queue *q, unsigned long arg) |
946 | { | |
947 | struct macvlan_dev *vlan; | |
948 | netdev_features_t features; | |
949 | netdev_features_t feature_mask = 0; | |
950 | ||
951 | vlan = rtnl_dereference(q->vlan); | |
952 | if (!vlan) | |
953 | return -ENOLINK; | |
954 | ||
955 | features = vlan->dev->features; | |
956 | ||
957 | if (arg & TUN_F_CSUM) { | |
958 | feature_mask = NETIF_F_HW_CSUM; | |
959 | ||
960 | if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) { | |
961 | if (arg & TUN_F_TSO_ECN) | |
962 | feature_mask |= NETIF_F_TSO_ECN; | |
963 | if (arg & TUN_F_TSO4) | |
964 | feature_mask |= NETIF_F_TSO; | |
965 | if (arg & TUN_F_TSO6) | |
966 | feature_mask |= NETIF_F_TSO6; | |
967 | } | |
e3e3c423 VY |
968 | |
969 | if (arg & TUN_F_UFO) | |
970 | feature_mask |= NETIF_F_UFO; | |
2be5c767 VY |
971 | } |
972 | ||
973 | /* tun/tap driver inverts the usage for TSO offloads, where | |
974 | * setting the TSO bit means that the userspace wants to | |
975 | * accept TSO frames and turning it off means that user space | |
976 | * does not support TSO. | |
977 | * For macvtap, we have to invert it to mean the same thing. | |
978 | * When user space turns off TSO, we turn off GSO/LRO so that | |
979 | * user-space will not receive TSO frames. | |
980 | */ | |
e3e3c423 | 981 | if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO)) |
2be5c767 VY |
982 | features |= RX_OFFLOADS; |
983 | else | |
984 | features &= ~RX_OFFLOADS; | |
985 | ||
986 | /* tap_features are the same as features on tun/tap and | |
987 | * reflect user expectations. | |
988 | */ | |
a567dd62 | 989 | vlan->tap_features = feature_mask; |
2be5c767 VY |
990 | vlan->set_features = features; |
991 | netdev_update_features(vlan->dev); | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
20d29d7a AB |
996 | /* |
997 | * provide compatibility with generic tun/tap interface | |
998 | */ | |
999 | static long macvtap_ioctl(struct file *file, unsigned int cmd, | |
1000 | unsigned long arg) | |
1001 | { | |
02df55d2 AB |
1002 | struct macvtap_queue *q = file->private_data; |
1003 | struct macvlan_dev *vlan; | |
20d29d7a AB |
1004 | void __user *argp = (void __user *)arg; |
1005 | struct ifreq __user *ifr = argp; | |
1006 | unsigned int __user *up = argp; | |
39ec7de7 | 1007 | unsigned short u; |
55afbd08 MT |
1008 | int __user *sp = argp; |
1009 | int s; | |
02df55d2 | 1010 | int ret; |
20d29d7a AB |
1011 | |
1012 | switch (cmd) { | |
1013 | case TUNSETIFF: | |
1014 | /* ignore the name, just look at flags */ | |
1015 | if (get_user(u, &ifr->ifr_flags)) | |
1016 | return -EFAULT; | |
b9fb9ee0 AB |
1017 | |
1018 | ret = 0; | |
6ae7feb3 | 1019 | if ((u & ~MACVTAP_FEATURES) != (IFF_NO_PI | IFF_TAP)) |
b9fb9ee0 AB |
1020 | ret = -EINVAL; |
1021 | else | |
39ec7de7 | 1022 | q->flags = (q->flags & ~MACVTAP_FEATURES) | u; |
b9fb9ee0 AB |
1023 | |
1024 | return ret; | |
20d29d7a AB |
1025 | |
1026 | case TUNGETIFF: | |
441ac0fc | 1027 | rtnl_lock(); |
8f475a31 | 1028 | vlan = macvtap_get_vlan(q); |
441ac0fc VY |
1029 | if (!vlan) { |
1030 | rtnl_unlock(); | |
20d29d7a | 1031 | return -ENOLINK; |
441ac0fc | 1032 | } |
20d29d7a | 1033 | |
02df55d2 | 1034 | ret = 0; |
39ec7de7 | 1035 | u = q->flags; |
13707f9e | 1036 | if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) || |
39ec7de7 | 1037 | put_user(u, &ifr->ifr_flags)) |
02df55d2 | 1038 | ret = -EFAULT; |
8f475a31 | 1039 | macvtap_put_vlan(vlan); |
441ac0fc | 1040 | rtnl_unlock(); |
02df55d2 | 1041 | return ret; |
20d29d7a | 1042 | |
815f236d JW |
1043 | case TUNSETQUEUE: |
1044 | if (get_user(u, &ifr->ifr_flags)) | |
1045 | return -EFAULT; | |
441ac0fc VY |
1046 | rtnl_lock(); |
1047 | ret = macvtap_ioctl_set_queue(file, u); | |
1048 | rtnl_unlock(); | |
82a19eb8 | 1049 | return ret; |
815f236d | 1050 | |
20d29d7a | 1051 | case TUNGETFEATURES: |
6ae7feb3 | 1052 | if (put_user(IFF_TAP | IFF_NO_PI | MACVTAP_FEATURES, up)) |
20d29d7a AB |
1053 | return -EFAULT; |
1054 | return 0; | |
1055 | ||
1056 | case TUNSETSNDBUF: | |
1057 | if (get_user(u, up)) | |
1058 | return -EFAULT; | |
1059 | ||
20d29d7a | 1060 | q->sk.sk_sndbuf = u; |
20d29d7a AB |
1061 | return 0; |
1062 | ||
55afbd08 MT |
1063 | case TUNGETVNETHDRSZ: |
1064 | s = q->vnet_hdr_sz; | |
1065 | if (put_user(s, sp)) | |
1066 | return -EFAULT; | |
1067 | return 0; | |
1068 | ||
1069 | case TUNSETVNETHDRSZ: | |
1070 | if (get_user(s, sp)) | |
1071 | return -EFAULT; | |
1072 | if (s < (int)sizeof(struct virtio_net_hdr)) | |
1073 | return -EINVAL; | |
1074 | ||
1075 | q->vnet_hdr_sz = s; | |
1076 | return 0; | |
1077 | ||
01b07fb3 MT |
1078 | case TUNGETVNETLE: |
1079 | s = !!(q->flags & MACVTAP_VNET_LE); | |
1080 | if (put_user(s, sp)) | |
1081 | return -EFAULT; | |
1082 | return 0; | |
1083 | ||
1084 | case TUNSETVNETLE: | |
1085 | if (get_user(s, sp)) | |
1086 | return -EFAULT; | |
1087 | if (s) | |
1088 | q->flags |= MACVTAP_VNET_LE; | |
1089 | else | |
1090 | q->flags &= ~MACVTAP_VNET_LE; | |
1091 | return 0; | |
1092 | ||
20d29d7a AB |
1093 | case TUNSETOFFLOAD: |
1094 | /* let the user check for future flags */ | |
1095 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
e3e3c423 | 1096 | TUN_F_TSO_ECN | TUN_F_UFO)) |
20d29d7a AB |
1097 | return -EINVAL; |
1098 | ||
2be5c767 VY |
1099 | rtnl_lock(); |
1100 | ret = set_offload(q, arg); | |
1101 | rtnl_unlock(); | |
1102 | return ret; | |
20d29d7a AB |
1103 | |
1104 | default: | |
1105 | return -EINVAL; | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | #ifdef CONFIG_COMPAT | |
1110 | static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, | |
1111 | unsigned long arg) | |
1112 | { | |
1113 | return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
1114 | } | |
1115 | #endif | |
1116 | ||
1117 | static const struct file_operations macvtap_fops = { | |
1118 | .owner = THIS_MODULE, | |
1119 | .open = macvtap_open, | |
1120 | .release = macvtap_release, | |
3af0bfe5 | 1121 | .read_iter = macvtap_read_iter, |
f5ff53b4 | 1122 | .write_iter = macvtap_write_iter, |
20d29d7a AB |
1123 | .poll = macvtap_poll, |
1124 | .llseek = no_llseek, | |
1125 | .unlocked_ioctl = macvtap_ioctl, | |
1126 | #ifdef CONFIG_COMPAT | |
1127 | .compat_ioctl = macvtap_compat_ioctl, | |
1128 | #endif | |
1129 | }; | |
1130 | ||
1b784140 YX |
1131 | static int macvtap_sendmsg(struct socket *sock, struct msghdr *m, |
1132 | size_t total_len) | |
501c774c AB |
1133 | { |
1134 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
c0371da6 | 1135 | return macvtap_get_user(q, m, &m->msg_iter, m->msg_flags & MSG_DONTWAIT); |
501c774c AB |
1136 | } |
1137 | ||
1b784140 YX |
1138 | static int macvtap_recvmsg(struct socket *sock, struct msghdr *m, |
1139 | size_t total_len, int flags) | |
501c774c AB |
1140 | { |
1141 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
1142 | int ret; | |
1143 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
1144 | return -EINVAL; | |
c0371da6 | 1145 | ret = macvtap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT); |
de2aa476 DM |
1146 | if (ret > total_len) { |
1147 | m->msg_flags |= MSG_TRUNC; | |
1148 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1149 | } | |
501c774c AB |
1150 | return ret; |
1151 | } | |
1152 | ||
1153 | /* Ops structure to mimic raw sockets with tun */ | |
1154 | static const struct proto_ops macvtap_socket_ops = { | |
1155 | .sendmsg = macvtap_sendmsg, | |
1156 | .recvmsg = macvtap_recvmsg, | |
1157 | }; | |
1158 | ||
1159 | /* Get an underlying socket object from tun file. Returns error unless file is | |
1160 | * attached to a device. The returned object works like a packet socket, it | |
1161 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1162 | * holding a reference to the file for as long as the socket is in use. */ | |
1163 | struct socket *macvtap_get_socket(struct file *file) | |
1164 | { | |
1165 | struct macvtap_queue *q; | |
1166 | if (file->f_op != &macvtap_fops) | |
1167 | return ERR_PTR(-EINVAL); | |
1168 | q = file->private_data; | |
1169 | if (!q) | |
1170 | return ERR_PTR(-EBADFD); | |
1171 | return &q->sock; | |
1172 | } | |
1173 | EXPORT_SYMBOL_GPL(macvtap_get_socket); | |
1174 | ||
9bf1907f EB |
1175 | static int macvtap_device_event(struct notifier_block *unused, |
1176 | unsigned long event, void *ptr) | |
1177 | { | |
351638e7 | 1178 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e09eff7f | 1179 | struct macvlan_dev *vlan; |
9bf1907f EB |
1180 | struct device *classdev; |
1181 | dev_t devt; | |
e09eff7f | 1182 | int err; |
9bf1907f EB |
1183 | |
1184 | if (dev->rtnl_link_ops != &macvtap_link_ops) | |
1185 | return NOTIFY_DONE; | |
1186 | ||
e09eff7f | 1187 | vlan = netdev_priv(dev); |
9bf1907f EB |
1188 | |
1189 | switch (event) { | |
1190 | case NETDEV_REGISTER: | |
1191 | /* Create the device node here after the network device has | |
1192 | * been registered but before register_netdevice has | |
1193 | * finished running. | |
1194 | */ | |
e09eff7f EB |
1195 | err = macvtap_get_minor(vlan); |
1196 | if (err) | |
1197 | return notifier_from_errno(err); | |
1198 | ||
1199 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); | |
9bf1907f EB |
1200 | classdev = device_create(macvtap_class, &dev->dev, devt, |
1201 | dev, "tap%d", dev->ifindex); | |
e09eff7f EB |
1202 | if (IS_ERR(classdev)) { |
1203 | macvtap_free_minor(vlan); | |
9bf1907f | 1204 | return notifier_from_errno(PTR_ERR(classdev)); |
e09eff7f | 1205 | } |
9bf1907f EB |
1206 | break; |
1207 | case NETDEV_UNREGISTER: | |
e09eff7f | 1208 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); |
9bf1907f | 1209 | device_destroy(macvtap_class, devt); |
e09eff7f | 1210 | macvtap_free_minor(vlan); |
9bf1907f EB |
1211 | break; |
1212 | } | |
1213 | ||
1214 | return NOTIFY_DONE; | |
1215 | } | |
1216 | ||
1217 | static struct notifier_block macvtap_notifier_block __read_mostly = { | |
1218 | .notifier_call = macvtap_device_event, | |
1219 | }; | |
1220 | ||
20d29d7a AB |
1221 | static int macvtap_init(void) |
1222 | { | |
1223 | int err; | |
1224 | ||
1225 | err = alloc_chrdev_region(&macvtap_major, 0, | |
1226 | MACVTAP_NUM_DEVS, "macvtap"); | |
1227 | if (err) | |
1228 | goto out1; | |
1229 | ||
1230 | cdev_init(&macvtap_cdev, &macvtap_fops); | |
1231 | err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); | |
1232 | if (err) | |
1233 | goto out2; | |
1234 | ||
1235 | macvtap_class = class_create(THIS_MODULE, "macvtap"); | |
1236 | if (IS_ERR(macvtap_class)) { | |
1237 | err = PTR_ERR(macvtap_class); | |
1238 | goto out3; | |
1239 | } | |
1240 | ||
9bf1907f | 1241 | err = register_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1242 | if (err) |
1243 | goto out4; | |
1244 | ||
9bf1907f EB |
1245 | err = macvlan_link_register(&macvtap_link_ops); |
1246 | if (err) | |
1247 | goto out5; | |
1248 | ||
20d29d7a AB |
1249 | return 0; |
1250 | ||
9bf1907f EB |
1251 | out5: |
1252 | unregister_netdevice_notifier(&macvtap_notifier_block); | |
20d29d7a AB |
1253 | out4: |
1254 | class_unregister(macvtap_class); | |
1255 | out3: | |
1256 | cdev_del(&macvtap_cdev); | |
1257 | out2: | |
1258 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1259 | out1: | |
1260 | return err; | |
1261 | } | |
1262 | module_init(macvtap_init); | |
1263 | ||
1264 | static void macvtap_exit(void) | |
1265 | { | |
1266 | rtnl_link_unregister(&macvtap_link_ops); | |
9bf1907f | 1267 | unregister_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1268 | class_unregister(macvtap_class); |
1269 | cdev_del(&macvtap_cdev); | |
1270 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1271 | } | |
1272 | module_exit(macvtap_exit); | |
1273 | ||
1274 | MODULE_ALIAS_RTNL_LINK("macvtap"); | |
1275 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
1276 | MODULE_LICENSE("GPL"); |