Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 1 | #include <linux/etherdevice.h> |
| 2 | #include <linux/if_macvlan.h> |
| 3 | #include <linux/interrupt.h> |
| 4 | #include <linux/nsproxy.h> |
| 5 | #include <linux/compat.h> |
| 6 | #include <linux/if_tun.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/skbuff.h> |
| 9 | #include <linux/cache.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/types.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 13 | #include <linux/init.h> |
| 14 | #include <linux/wait.h> |
| 15 | #include <linux/cdev.h> |
| 16 | #include <linux/fs.h> |
| 17 | |
| 18 | #include <net/net_namespace.h> |
| 19 | #include <net/rtnetlink.h> |
| 20 | #include <net/sock.h> |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 21 | #include <linux/virtio_net.h> |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 22 | |
| 23 | /* |
| 24 | * A macvtap queue is the central object of this driver, it connects |
| 25 | * an open character device to a macvlan interface. There can be |
| 26 | * multiple queues on one interface, which map back to queues |
| 27 | * implemented in hardware on the underlying device. |
| 28 | * |
| 29 | * macvtap_proto is used to allocate queues through the sock allocation |
| 30 | * mechanism. |
| 31 | * |
| 32 | * TODO: multiqueue support is currently not implemented, even though |
| 33 | * macvtap is basically prepared for that. We will need to add this |
| 34 | * here as well as in virtio-net and qemu to get line rate on 10gbit |
| 35 | * adapters from a guest. |
| 36 | */ |
| 37 | struct macvtap_queue { |
| 38 | struct sock sk; |
| 39 | struct socket sock; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 40 | struct socket_wq wq; |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 41 | int vnet_hdr_sz; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 42 | struct macvlan_dev *vlan; |
| 43 | struct file *file; |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 44 | unsigned int flags; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 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 | /* |
| 54 | * Minor number matches netdev->ifindex, so need a potentially |
| 55 | * large value. This also makes it possible to split the |
| 56 | * tap functionality out again in the future by offering it |
| 57 | * from other drivers besides macvtap. As long as every device |
| 58 | * only has one tap, the interface numbers assure that the |
| 59 | * device nodes are unique. |
| 60 | */ |
David S. Miller | 1ebed71 | 2010-07-10 19:25:50 -0700 | [diff] [blame] | 61 | static dev_t macvtap_major; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 62 | #define MACVTAP_NUM_DEVS 65536 |
| 63 | static struct class *macvtap_class; |
| 64 | static struct cdev macvtap_cdev; |
| 65 | |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 66 | static const struct proto_ops macvtap_socket_ops; |
| 67 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 68 | /* |
| 69 | * RCU usage: |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 70 | * The macvtap_queue and the macvlan_dev are loosely coupled, the |
| 71 | * pointers from one to the other can only be read while rcu_read_lock |
| 72 | * or macvtap_lock is held. |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 73 | * |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 74 | * Both the file and the macvlan_dev hold a reference on the macvtap_queue |
| 75 | * through sock_hold(&q->sk). When the macvlan_dev goes away first, |
| 76 | * q->vlan becomes inaccessible. When the files gets closed, |
| 77 | * macvtap_get_queue() fails. |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 78 | * |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 79 | * There may still be references to the struct sock inside of the |
| 80 | * queue from outbound SKBs, but these never reference back to the |
| 81 | * file or the dev. The data structure is freed through __sk_free |
| 82 | * when both our references and any pending SKBs are gone. |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 83 | */ |
| 84 | static DEFINE_SPINLOCK(macvtap_lock); |
| 85 | |
| 86 | /* |
| 87 | * Choose the next free queue, for now there is only one |
| 88 | */ |
| 89 | static int macvtap_set_queue(struct net_device *dev, struct file *file, |
| 90 | struct macvtap_queue *q) |
| 91 | { |
| 92 | struct macvlan_dev *vlan = netdev_priv(dev); |
| 93 | int err = -EBUSY; |
| 94 | |
| 95 | spin_lock(&macvtap_lock); |
| 96 | if (rcu_dereference(vlan->tap)) |
| 97 | goto out; |
| 98 | |
| 99 | err = 0; |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 100 | rcu_assign_pointer(q->vlan, vlan); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 101 | rcu_assign_pointer(vlan->tap, q); |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 102 | sock_hold(&q->sk); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 103 | |
| 104 | q->file = file; |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 105 | file->private_data = q; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 106 | |
| 107 | out: |
| 108 | spin_unlock(&macvtap_lock); |
| 109 | return err; |
| 110 | } |
| 111 | |
| 112 | /* |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 113 | * The file owning the queue got closed, give up both |
| 114 | * the reference that the files holds as well as the |
| 115 | * one from the macvlan_dev if that still exists. |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 116 | * |
| 117 | * Using the spinlock makes sure that we don't get |
| 118 | * to the queue again after destroying it. |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 119 | */ |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 120 | static void macvtap_put_queue(struct macvtap_queue *q) |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 121 | { |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 122 | struct macvlan_dev *vlan; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 123 | |
| 124 | spin_lock(&macvtap_lock); |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 125 | vlan = rcu_dereference(q->vlan); |
| 126 | if (vlan) { |
| 127 | rcu_assign_pointer(vlan->tap, NULL); |
| 128 | rcu_assign_pointer(q->vlan, NULL); |
| 129 | sock_put(&q->sk); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 130 | } |
| 131 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 132 | spin_unlock(&macvtap_lock); |
| 133 | |
| 134 | synchronize_rcu(); |
| 135 | sock_put(&q->sk); |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Since we only support one queue, just dereference the pointer. |
| 140 | */ |
| 141 | static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, |
| 142 | struct sk_buff *skb) |
| 143 | { |
| 144 | struct macvlan_dev *vlan = netdev_priv(dev); |
| 145 | |
| 146 | return rcu_dereference(vlan->tap); |
| 147 | } |
| 148 | |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 149 | /* |
| 150 | * The net_device is going away, give up the reference |
| 151 | * that it holds on the queue (all the queues one day) |
| 152 | * and safely set the pointer from the queues to NULL. |
| 153 | */ |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 154 | static void macvtap_del_queues(struct net_device *dev) |
| 155 | { |
| 156 | struct macvlan_dev *vlan = netdev_priv(dev); |
Arnd Bergmann | 564517e | 2010-02-11 05:55:39 +0000 | [diff] [blame] | 157 | struct macvtap_queue *q; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 158 | |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 159 | spin_lock(&macvtap_lock); |
| 160 | q = rcu_dereference(vlan->tap); |
| 161 | if (!q) { |
| 162 | spin_unlock(&macvtap_lock); |
| 163 | return; |
| 164 | } |
| 165 | |
| 166 | rcu_assign_pointer(vlan->tap, NULL); |
| 167 | rcu_assign_pointer(q->vlan, NULL); |
| 168 | spin_unlock(&macvtap_lock); |
| 169 | |
| 170 | synchronize_rcu(); |
Arnd Bergmann | 564517e | 2010-02-11 05:55:39 +0000 | [diff] [blame] | 171 | sock_put(&q->sk); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Forward happens for data that gets sent from one macvlan |
| 176 | * endpoint to another one in bridge mode. We just take |
| 177 | * the skb and put it into the receive queue. |
| 178 | */ |
| 179 | static int macvtap_forward(struct net_device *dev, struct sk_buff *skb) |
| 180 | { |
| 181 | struct macvtap_queue *q = macvtap_get_queue(dev, skb); |
| 182 | if (!q) |
Herbert Xu | 8a35747 | 2010-07-21 21:44:31 +0000 | [diff] [blame] | 183 | goto drop; |
| 184 | |
| 185 | if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len) |
| 186 | goto drop; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 187 | |
| 188 | skb_queue_tail(&q->sk.sk_receive_queue, skb); |
Eric Dumazet | 4a4771a | 2010-04-25 22:20:06 +0000 | [diff] [blame] | 189 | wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND); |
Herbert Xu | 8a35747 | 2010-07-21 21:44:31 +0000 | [diff] [blame] | 190 | return NET_RX_SUCCESS; |
| 191 | |
| 192 | drop: |
| 193 | kfree_skb(skb); |
| 194 | return NET_RX_DROP; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Receive is for data from the external interface (lowerdev), |
| 199 | * in case of macvtap, we can treat that the same way as |
| 200 | * forward, which macvlan cannot. |
| 201 | */ |
| 202 | static int macvtap_receive(struct sk_buff *skb) |
| 203 | { |
| 204 | skb_push(skb, ETH_HLEN); |
| 205 | return macvtap_forward(skb->dev, skb); |
| 206 | } |
| 207 | |
| 208 | static int macvtap_newlink(struct net *src_net, |
| 209 | struct net_device *dev, |
| 210 | struct nlattr *tb[], |
| 211 | struct nlattr *data[]) |
| 212 | { |
| 213 | struct device *classdev; |
| 214 | dev_t devt; |
| 215 | int err; |
| 216 | |
| 217 | err = macvlan_common_newlink(src_net, dev, tb, data, |
| 218 | macvtap_receive, macvtap_forward); |
| 219 | if (err) |
| 220 | goto out; |
| 221 | |
| 222 | devt = MKDEV(MAJOR(macvtap_major), dev->ifindex); |
| 223 | |
| 224 | classdev = device_create(macvtap_class, &dev->dev, devt, |
| 225 | dev, "tap%d", dev->ifindex); |
| 226 | if (IS_ERR(classdev)) { |
| 227 | err = PTR_ERR(classdev); |
| 228 | macvtap_del_queues(dev); |
| 229 | } |
| 230 | |
| 231 | out: |
| 232 | return err; |
| 233 | } |
| 234 | |
| 235 | static void macvtap_dellink(struct net_device *dev, |
| 236 | struct list_head *head) |
| 237 | { |
| 238 | device_destroy(macvtap_class, |
| 239 | MKDEV(MAJOR(macvtap_major), dev->ifindex)); |
| 240 | |
| 241 | macvtap_del_queues(dev); |
| 242 | macvlan_dellink(dev, head); |
| 243 | } |
| 244 | |
Herbert Xu | 8a35747 | 2010-07-21 21:44:31 +0000 | [diff] [blame] | 245 | static void macvtap_setup(struct net_device *dev) |
| 246 | { |
| 247 | macvlan_common_setup(dev); |
| 248 | dev->tx_queue_len = TUN_READQ_SIZE; |
| 249 | } |
| 250 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 251 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { |
| 252 | .kind = "macvtap", |
Herbert Xu | 8a35747 | 2010-07-21 21:44:31 +0000 | [diff] [blame] | 253 | .setup = macvtap_setup, |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 254 | .newlink = macvtap_newlink, |
| 255 | .dellink = macvtap_dellink, |
| 256 | }; |
| 257 | |
| 258 | |
| 259 | static void macvtap_sock_write_space(struct sock *sk) |
| 260 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 261 | wait_queue_head_t *wqueue; |
| 262 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 263 | if (!sock_writeable(sk) || |
| 264 | !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
| 265 | return; |
| 266 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 267 | wqueue = sk_sleep(sk); |
| 268 | if (wqueue && waitqueue_active(wqueue)) |
| 269 | wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | static int macvtap_open(struct inode *inode, struct file *file) |
| 273 | { |
| 274 | struct net *net = current->nsproxy->net_ns; |
| 275 | struct net_device *dev = dev_get_by_index(net, iminor(inode)); |
| 276 | struct macvtap_queue *q; |
| 277 | int err; |
| 278 | |
| 279 | err = -ENODEV; |
| 280 | if (!dev) |
| 281 | goto out; |
| 282 | |
| 283 | /* check if this is a macvtap device */ |
| 284 | err = -EINVAL; |
| 285 | if (dev->rtnl_link_ops != &macvtap_link_ops) |
| 286 | goto out; |
| 287 | |
| 288 | err = -ENOMEM; |
| 289 | q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
| 290 | &macvtap_proto); |
| 291 | if (!q) |
| 292 | goto out; |
| 293 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 294 | q->sock.wq = &q->wq; |
| 295 | init_waitqueue_head(&q->wq.wait); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 296 | q->sock.type = SOCK_RAW; |
| 297 | q->sock.state = SS_CONNECTED; |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 298 | q->sock.file = file; |
| 299 | q->sock.ops = &macvtap_socket_ops; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 300 | sock_init_data(&q->sock, &q->sk); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 301 | q->sk.sk_write_space = macvtap_sock_write_space; |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 302 | q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 303 | q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 304 | |
| 305 | err = macvtap_set_queue(dev, file, q); |
| 306 | if (err) |
| 307 | sock_put(&q->sk); |
| 308 | |
| 309 | out: |
| 310 | if (dev) |
| 311 | dev_put(dev); |
| 312 | |
| 313 | return err; |
| 314 | } |
| 315 | |
| 316 | static int macvtap_release(struct inode *inode, struct file *file) |
| 317 | { |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 318 | struct macvtap_queue *q = file->private_data; |
| 319 | macvtap_put_queue(q); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static unsigned int macvtap_poll(struct file *file, poll_table * wait) |
| 324 | { |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 325 | struct macvtap_queue *q = file->private_data; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 326 | unsigned int mask = POLLERR; |
| 327 | |
| 328 | if (!q) |
| 329 | goto out; |
| 330 | |
| 331 | mask = 0; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 332 | poll_wait(file, &q->wq.wait, wait); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 333 | |
| 334 | if (!skb_queue_empty(&q->sk.sk_receive_queue)) |
| 335 | mask |= POLLIN | POLLRDNORM; |
| 336 | |
| 337 | if (sock_writeable(&q->sk) || |
| 338 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) && |
| 339 | sock_writeable(&q->sk))) |
| 340 | mask |= POLLOUT | POLLWRNORM; |
| 341 | |
| 342 | out: |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 343 | return mask; |
| 344 | } |
| 345 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 346 | static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, |
| 347 | size_t len, size_t linear, |
| 348 | int noblock, int *err) |
| 349 | { |
| 350 | struct sk_buff *skb; |
| 351 | |
| 352 | /* Under a page? Don't bother with paged skb. */ |
| 353 | if (prepad + len < PAGE_SIZE || !linear) |
| 354 | linear = len; |
| 355 | |
| 356 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
| 357 | err); |
| 358 | if (!skb) |
| 359 | return NULL; |
| 360 | |
| 361 | skb_reserve(skb, prepad); |
| 362 | skb_put(skb, linear); |
| 363 | skb->data_len = len - linear; |
| 364 | skb->len += len - linear; |
| 365 | |
| 366 | return skb; |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should |
| 371 | * be shared with the tun/tap driver. |
| 372 | */ |
| 373 | static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, |
| 374 | struct virtio_net_hdr *vnet_hdr) |
| 375 | { |
| 376 | unsigned short gso_type = 0; |
| 377 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 378 | switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 379 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 380 | gso_type = SKB_GSO_TCPV4; |
| 381 | break; |
| 382 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 383 | gso_type = SKB_GSO_TCPV6; |
| 384 | break; |
| 385 | case VIRTIO_NET_HDR_GSO_UDP: |
| 386 | gso_type = SKB_GSO_UDP; |
| 387 | break; |
| 388 | default: |
| 389 | return -EINVAL; |
| 390 | } |
| 391 | |
| 392 | if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 393 | gso_type |= SKB_GSO_TCP_ECN; |
| 394 | |
| 395 | if (vnet_hdr->gso_size == 0) |
| 396 | return -EINVAL; |
| 397 | } |
| 398 | |
| 399 | if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 400 | if (!skb_partial_csum_set(skb, vnet_hdr->csum_start, |
| 401 | vnet_hdr->csum_offset)) |
| 402 | return -EINVAL; |
| 403 | } |
| 404 | |
| 405 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 406 | skb_shinfo(skb)->gso_size = vnet_hdr->gso_size; |
| 407 | skb_shinfo(skb)->gso_type = gso_type; |
| 408 | |
| 409 | /* Header must be checked, and gso_segs computed. */ |
| 410 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 411 | skb_shinfo(skb)->gso_segs = 0; |
| 412 | } |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | static int macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, |
| 417 | struct virtio_net_hdr *vnet_hdr) |
| 418 | { |
| 419 | memset(vnet_hdr, 0, sizeof(*vnet_hdr)); |
| 420 | |
| 421 | if (skb_is_gso(skb)) { |
| 422 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
| 423 | |
| 424 | /* This is a hint as to how much should be linear. */ |
| 425 | vnet_hdr->hdr_len = skb_headlen(skb); |
| 426 | vnet_hdr->gso_size = sinfo->gso_size; |
| 427 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
| 428 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 429 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| 430 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| 431 | else if (sinfo->gso_type & SKB_GSO_UDP) |
| 432 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; |
| 433 | else |
| 434 | BUG(); |
| 435 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| 436 | vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 437 | } else |
| 438 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 439 | |
| 440 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 441 | vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 442 | vnet_hdr->csum_start = skb->csum_start - |
| 443 | skb_headroom(skb); |
| 444 | vnet_hdr->csum_offset = skb->csum_offset; |
| 445 | } /* else everything is zero */ |
| 446 | |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 451 | /* Get packet from user space buffer */ |
| 452 | static ssize_t macvtap_get_user(struct macvtap_queue *q, |
| 453 | const struct iovec *iv, size_t count, |
| 454 | int noblock) |
| 455 | { |
| 456 | struct sk_buff *skb; |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 457 | struct macvlan_dev *vlan; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 458 | size_t len = count; |
| 459 | int err; |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 460 | struct virtio_net_hdr vnet_hdr = { 0 }; |
| 461 | int vnet_hdr_len = 0; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 462 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 463 | if (q->flags & IFF_VNET_HDR) { |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 464 | vnet_hdr_len = q->vnet_hdr_sz; |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 465 | |
| 466 | err = -EINVAL; |
| 467 | if ((len -= vnet_hdr_len) < 0) |
| 468 | goto err; |
| 469 | |
| 470 | err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0, |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 471 | sizeof(vnet_hdr)); |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 472 | if (err < 0) |
| 473 | goto err; |
| 474 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
| 475 | vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > |
| 476 | vnet_hdr.hdr_len) |
| 477 | vnet_hdr.hdr_len = vnet_hdr.csum_start + |
| 478 | vnet_hdr.csum_offset + 2; |
| 479 | err = -EINVAL; |
| 480 | if (vnet_hdr.hdr_len > len) |
| 481 | goto err; |
| 482 | } |
| 483 | |
| 484 | err = -EINVAL; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 485 | if (unlikely(len < ETH_HLEN)) |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 486 | goto err; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 487 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 488 | skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, len, vnet_hdr.hdr_len, |
| 489 | noblock, &err); |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 490 | if (!skb) |
| 491 | goto err; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 492 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 493 | err = skb_copy_datagram_from_iovec(skb, 0, iv, vnet_hdr_len, len); |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 494 | if (err) |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 495 | goto err_kfree; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 496 | |
| 497 | skb_set_network_header(skb, ETH_HLEN); |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 498 | skb_reset_mac_header(skb); |
| 499 | skb->protocol = eth_hdr(skb)->h_proto; |
| 500 | |
| 501 | if (vnet_hdr_len) { |
| 502 | err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr); |
| 503 | if (err) |
| 504 | goto err_kfree; |
| 505 | } |
| 506 | |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 507 | rcu_read_lock_bh(); |
| 508 | vlan = rcu_dereference(q->vlan); |
| 509 | if (vlan) |
| 510 | macvlan_start_xmit(skb, vlan->dev); |
| 511 | else |
| 512 | kfree_skb(skb); |
| 513 | rcu_read_unlock_bh(); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 514 | |
| 515 | return count; |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 516 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 517 | err_kfree: |
| 518 | kfree_skb(skb); |
| 519 | |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 520 | err: |
| 521 | rcu_read_lock_bh(); |
| 522 | vlan = rcu_dereference(q->vlan); |
| 523 | if (vlan) |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 524 | netdev_get_tx_queue(vlan->dev, 0)->tx_dropped++; |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 525 | rcu_read_unlock_bh(); |
| 526 | |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 527 | return err; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv, |
| 531 | unsigned long count, loff_t pos) |
| 532 | { |
| 533 | struct file *file = iocb->ki_filp; |
| 534 | ssize_t result = -ENOLINK; |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 535 | struct macvtap_queue *q = file->private_data; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 536 | |
| 537 | result = macvtap_get_user(q, iv, iov_length(iv, count), |
| 538 | file->f_flags & O_NONBLOCK); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 539 | return result; |
| 540 | } |
| 541 | |
| 542 | /* Put packet to the user space buffer */ |
| 543 | static ssize_t macvtap_put_user(struct macvtap_queue *q, |
| 544 | const struct sk_buff *skb, |
| 545 | const struct iovec *iv, int len) |
| 546 | { |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 547 | struct macvlan_dev *vlan; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 548 | int ret; |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 549 | int vnet_hdr_len = 0; |
| 550 | |
| 551 | if (q->flags & IFF_VNET_HDR) { |
| 552 | struct virtio_net_hdr vnet_hdr; |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 553 | vnet_hdr_len = q->vnet_hdr_sz; |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 554 | if ((len -= vnet_hdr_len) < 0) |
| 555 | return -EINVAL; |
| 556 | |
| 557 | ret = macvtap_skb_to_vnet_hdr(skb, &vnet_hdr); |
| 558 | if (ret) |
| 559 | return ret; |
| 560 | |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 561 | if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr))) |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 562 | return -EFAULT; |
| 563 | } |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 564 | |
| 565 | len = min_t(int, skb->len, len); |
| 566 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 567 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, vnet_hdr_len, len); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 568 | |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 569 | rcu_read_lock_bh(); |
| 570 | vlan = rcu_dereference(q->vlan); |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 571 | if (vlan) |
| 572 | macvlan_count_rx(vlan, len, ret == 0, 0); |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 573 | rcu_read_unlock_bh(); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 574 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 575 | return ret ? ret : (len + vnet_hdr_len); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 576 | } |
| 577 | |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 578 | static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb, |
| 579 | const struct iovec *iv, unsigned long len, |
| 580 | int noblock) |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 581 | { |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 582 | DECLARE_WAITQUEUE(wait, current); |
| 583 | struct sk_buff *skb; |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 584 | ssize_t ret = 0; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 585 | |
Eric Dumazet | 4a4771a | 2010-04-25 22:20:06 +0000 | [diff] [blame] | 586 | add_wait_queue(sk_sleep(&q->sk), &wait); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 587 | while (len) { |
| 588 | current->state = TASK_INTERRUPTIBLE; |
| 589 | |
| 590 | /* Read frames from the queue */ |
| 591 | skb = skb_dequeue(&q->sk.sk_receive_queue); |
| 592 | if (!skb) { |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 593 | if (noblock) { |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 594 | ret = -EAGAIN; |
| 595 | break; |
| 596 | } |
| 597 | if (signal_pending(current)) { |
| 598 | ret = -ERESTARTSYS; |
| 599 | break; |
| 600 | } |
| 601 | /* Nothing to read, let's sleep */ |
| 602 | schedule(); |
| 603 | continue; |
| 604 | } |
| 605 | ret = macvtap_put_user(q, skb, iv, len); |
| 606 | kfree_skb(skb); |
| 607 | break; |
| 608 | } |
| 609 | |
| 610 | current->state = TASK_RUNNING; |
Eric Dumazet | 4a4771a | 2010-04-25 22:20:06 +0000 | [diff] [blame] | 611 | remove_wait_queue(sk_sleep(&q->sk), &wait); |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 612 | return ret; |
| 613 | } |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 614 | |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 615 | static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv, |
| 616 | unsigned long count, loff_t pos) |
| 617 | { |
| 618 | struct file *file = iocb->ki_filp; |
| 619 | struct macvtap_queue *q = file->private_data; |
| 620 | ssize_t len, ret = 0; |
| 621 | |
| 622 | len = iov_length(iv, count); |
| 623 | if (len < 0) { |
| 624 | ret = -EINVAL; |
| 625 | goto out; |
| 626 | } |
| 627 | |
| 628 | ret = macvtap_do_read(q, iocb, iv, len, file->f_flags & O_NONBLOCK); |
| 629 | ret = min_t(ssize_t, ret, len); /* XXX copied from tun.c. Why? */ |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 630 | out: |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 631 | return ret; |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * provide compatibility with generic tun/tap interface |
| 636 | */ |
| 637 | static long macvtap_ioctl(struct file *file, unsigned int cmd, |
| 638 | unsigned long arg) |
| 639 | { |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 640 | struct macvtap_queue *q = file->private_data; |
| 641 | struct macvlan_dev *vlan; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 642 | void __user *argp = (void __user *)arg; |
| 643 | struct ifreq __user *ifr = argp; |
| 644 | unsigned int __user *up = argp; |
| 645 | unsigned int u; |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 646 | int __user *sp = argp; |
| 647 | int s; |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 648 | int ret; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 649 | |
| 650 | switch (cmd) { |
| 651 | case TUNSETIFF: |
| 652 | /* ignore the name, just look at flags */ |
| 653 | if (get_user(u, &ifr->ifr_flags)) |
| 654 | return -EFAULT; |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 655 | |
| 656 | ret = 0; |
| 657 | if ((u & ~IFF_VNET_HDR) != (IFF_NO_PI | IFF_TAP)) |
| 658 | ret = -EINVAL; |
| 659 | else |
| 660 | q->flags = u; |
| 661 | |
| 662 | return ret; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 663 | |
| 664 | case TUNGETIFF: |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 665 | rcu_read_lock_bh(); |
| 666 | vlan = rcu_dereference(q->vlan); |
| 667 | if (vlan) |
| 668 | dev_hold(vlan->dev); |
| 669 | rcu_read_unlock_bh(); |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 670 | |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 671 | if (!vlan) |
| 672 | return -ENOLINK; |
| 673 | |
| 674 | ret = 0; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 675 | if (copy_to_user(&ifr->ifr_name, q->vlan->dev->name, IFNAMSIZ) || |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 676 | put_user(q->flags, &ifr->ifr_flags)) |
Arnd Bergmann | 02df55d | 2010-02-18 05:45:36 +0000 | [diff] [blame] | 677 | ret = -EFAULT; |
| 678 | dev_put(vlan->dev); |
| 679 | return ret; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 680 | |
| 681 | case TUNGETFEATURES: |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 682 | if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR, up)) |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 683 | return -EFAULT; |
| 684 | return 0; |
| 685 | |
| 686 | case TUNSETSNDBUF: |
| 687 | if (get_user(u, up)) |
| 688 | return -EFAULT; |
| 689 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 690 | q->sk.sk_sndbuf = u; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 691 | return 0; |
| 692 | |
Michael S. Tsirkin | 55afbd0 | 2010-04-29 13:50:48 +0300 | [diff] [blame] | 693 | case TUNGETVNETHDRSZ: |
| 694 | s = q->vnet_hdr_sz; |
| 695 | if (put_user(s, sp)) |
| 696 | return -EFAULT; |
| 697 | return 0; |
| 698 | |
| 699 | case TUNSETVNETHDRSZ: |
| 700 | if (get_user(s, sp)) |
| 701 | return -EFAULT; |
| 702 | if (s < (int)sizeof(struct virtio_net_hdr)) |
| 703 | return -EINVAL; |
| 704 | |
| 705 | q->vnet_hdr_sz = s; |
| 706 | return 0; |
| 707 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 708 | case TUNSETOFFLOAD: |
| 709 | /* let the user check for future flags */ |
| 710 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 711 | TUN_F_TSO_ECN | TUN_F_UFO)) |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 712 | return -EINVAL; |
| 713 | |
Arnd Bergmann | b9fb9ee | 2010-02-18 05:48:17 +0000 | [diff] [blame] | 714 | /* TODO: only accept frames with the features that |
| 715 | got enabled for forwarded frames */ |
| 716 | if (!(q->flags & IFF_VNET_HDR)) |
| 717 | return -EINVAL; |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 718 | return 0; |
| 719 | |
| 720 | default: |
| 721 | return -EINVAL; |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | #ifdef CONFIG_COMPAT |
| 726 | static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, |
| 727 | unsigned long arg) |
| 728 | { |
| 729 | return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); |
| 730 | } |
| 731 | #endif |
| 732 | |
| 733 | static const struct file_operations macvtap_fops = { |
| 734 | .owner = THIS_MODULE, |
| 735 | .open = macvtap_open, |
| 736 | .release = macvtap_release, |
| 737 | .aio_read = macvtap_aio_read, |
| 738 | .aio_write = macvtap_aio_write, |
| 739 | .poll = macvtap_poll, |
| 740 | .llseek = no_llseek, |
| 741 | .unlocked_ioctl = macvtap_ioctl, |
| 742 | #ifdef CONFIG_COMPAT |
| 743 | .compat_ioctl = macvtap_compat_ioctl, |
| 744 | #endif |
| 745 | }; |
| 746 | |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 747 | static int macvtap_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 748 | struct msghdr *m, size_t total_len) |
| 749 | { |
| 750 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); |
| 751 | return macvtap_get_user(q, m->msg_iov, total_len, |
| 752 | m->msg_flags & MSG_DONTWAIT); |
| 753 | } |
| 754 | |
| 755 | static int macvtap_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 756 | struct msghdr *m, size_t total_len, |
| 757 | int flags) |
| 758 | { |
| 759 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); |
| 760 | int ret; |
| 761 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) |
| 762 | return -EINVAL; |
| 763 | ret = macvtap_do_read(q, iocb, m->msg_iov, total_len, |
| 764 | flags & MSG_DONTWAIT); |
| 765 | if (ret > total_len) { |
| 766 | m->msg_flags |= MSG_TRUNC; |
| 767 | ret = flags & MSG_TRUNC ? ret : total_len; |
| 768 | } |
| 769 | return ret; |
| 770 | } |
| 771 | |
| 772 | /* Ops structure to mimic raw sockets with tun */ |
| 773 | static const struct proto_ops macvtap_socket_ops = { |
| 774 | .sendmsg = macvtap_sendmsg, |
| 775 | .recvmsg = macvtap_recvmsg, |
| 776 | }; |
| 777 | |
| 778 | /* Get an underlying socket object from tun file. Returns error unless file is |
| 779 | * attached to a device. The returned object works like a packet socket, it |
| 780 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for |
| 781 | * holding a reference to the file for as long as the socket is in use. */ |
| 782 | struct socket *macvtap_get_socket(struct file *file) |
| 783 | { |
| 784 | struct macvtap_queue *q; |
| 785 | if (file->f_op != &macvtap_fops) |
| 786 | return ERR_PTR(-EINVAL); |
| 787 | q = file->private_data; |
| 788 | if (!q) |
| 789 | return ERR_PTR(-EBADFD); |
| 790 | return &q->sock; |
| 791 | } |
| 792 | EXPORT_SYMBOL_GPL(macvtap_get_socket); |
| 793 | |
Arnd Bergmann | 20d29d7 | 2010-01-30 12:24:26 +0000 | [diff] [blame] | 794 | static int macvtap_init(void) |
| 795 | { |
| 796 | int err; |
| 797 | |
| 798 | err = alloc_chrdev_region(&macvtap_major, 0, |
| 799 | MACVTAP_NUM_DEVS, "macvtap"); |
| 800 | if (err) |
| 801 | goto out1; |
| 802 | |
| 803 | cdev_init(&macvtap_cdev, &macvtap_fops); |
| 804 | err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); |
| 805 | if (err) |
| 806 | goto out2; |
| 807 | |
| 808 | macvtap_class = class_create(THIS_MODULE, "macvtap"); |
| 809 | if (IS_ERR(macvtap_class)) { |
| 810 | err = PTR_ERR(macvtap_class); |
| 811 | goto out3; |
| 812 | } |
| 813 | |
| 814 | err = macvlan_link_register(&macvtap_link_ops); |
| 815 | if (err) |
| 816 | goto out4; |
| 817 | |
| 818 | return 0; |
| 819 | |
| 820 | out4: |
| 821 | class_unregister(macvtap_class); |
| 822 | out3: |
| 823 | cdev_del(&macvtap_cdev); |
| 824 | out2: |
| 825 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); |
| 826 | out1: |
| 827 | return err; |
| 828 | } |
| 829 | module_init(macvtap_init); |
| 830 | |
| 831 | static void macvtap_exit(void) |
| 832 | { |
| 833 | rtnl_link_unregister(&macvtap_link_ops); |
| 834 | class_unregister(macvtap_class); |
| 835 | cdev_del(&macvtap_cdev); |
| 836 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); |
| 837 | } |
| 838 | module_exit(macvtap_exit); |
| 839 | |
| 840 | MODULE_ALIAS_RTNL_LINK("macvtap"); |
| 841 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); |
| 842 | MODULE_LICENSE("GPL"); |