1 #include <linux/etherdevice.h>
2 #include <linux/if_macvlan.h>
3 #include <linux/if_tap.h>
4 #include <linux/if_vlan.h>
5 #include <linux/interrupt.h>
6 #include <linux/nsproxy.h>
7 #include <linux/compat.h>
8 #include <linux/if_tun.h>
9 #include <linux/module.h>
10 #include <linux/skbuff.h>
11 #include <linux/cache.h>
12 #include <linux/sched.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/wait.h>
16 #include <linux/cdev.h>
17 #include <linux/idr.h>
19 #include <linux/uio.h>
21 #include <net/net_namespace.h>
22 #include <net/rtnetlink.h>
24 #include <linux/virtio_net.h>
25 #include <linux/skb_array.h>
28 struct macvlan_dev vlan;
33 * Variables for dealing with macvtaps device numbers.
35 static dev_t macvtap_major;
37 static const void *macvtap_net_namespace(struct device *d)
39 struct net_device *dev = to_net_dev(d->parent);
43 static struct class macvtap_class = {
46 .ns_type = &net_ns_type_operations,
47 .namespace = macvtap_net_namespace,
49 static struct cdev macvtap_cdev;
51 #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
52 NETIF_F_TSO6 | NETIF_F_UFO)
54 static void macvtap_count_tx_dropped(struct tap_dev *tap)
56 struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap);
57 struct macvlan_dev *vlan = &vlantap->vlan;
59 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
62 static void macvtap_count_rx_dropped(struct tap_dev *tap)
64 struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap);
65 struct macvlan_dev *vlan = &vlantap->vlan;
67 macvlan_count_rx(vlan, 0, 0, 0);
70 static void macvtap_update_features(struct tap_dev *tap,
71 netdev_features_t features)
73 struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap);
74 struct macvlan_dev *vlan = &vlantap->vlan;
76 vlan->set_features = features;
77 netdev_update_features(vlan->dev);
80 static int macvtap_newlink(struct net *src_net,
81 struct net_device *dev,
83 struct nlattr *data[])
85 struct macvtap_dev *vlantap = netdev_priv(dev);
88 INIT_LIST_HEAD(&vlantap->tap.queue_list);
90 /* Since macvlan supports all offloads by default, make
91 * tap support all offloads also.
93 vlantap->tap.tap_features = TUN_OFFLOADS;
95 /* Register callbacks for rx/tx drops accounting and updating
98 vlantap->tap.count_tx_dropped = macvtap_count_tx_dropped;
99 vlantap->tap.count_rx_dropped = macvtap_count_rx_dropped;
100 vlantap->tap.update_features = macvtap_update_features;
102 err = netdev_rx_handler_register(dev, tap_handle_frame, &vlantap->tap);
106 /* Don't put anything that may fail after macvlan_common_newlink
107 * because we can't undo what it does.
109 err = macvlan_common_newlink(src_net, dev, tb, data);
111 netdev_rx_handler_unregister(dev);
115 vlantap->tap.dev = vlantap->vlan.dev;
120 static void macvtap_dellink(struct net_device *dev,
121 struct list_head *head)
123 struct macvtap_dev *vlantap = netdev_priv(dev);
125 netdev_rx_handler_unregister(dev);
126 tap_del_queues(&vlantap->tap);
127 macvlan_dellink(dev, head);
130 static void macvtap_setup(struct net_device *dev)
132 macvlan_common_setup(dev);
133 dev->tx_queue_len = TUN_READQ_SIZE;
136 static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
138 .setup = macvtap_setup,
139 .newlink = macvtap_newlink,
140 .dellink = macvtap_dellink,
141 .priv_size = sizeof(struct macvtap_dev),
144 static int macvtap_device_event(struct notifier_block *unused,
145 unsigned long event, void *ptr)
147 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
148 struct macvtap_dev *vlantap;
149 struct device *classdev;
152 char tap_name[IFNAMSIZ];
154 if (dev->rtnl_link_ops != &macvtap_link_ops)
157 snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex);
158 vlantap = netdev_priv(dev);
161 case NETDEV_REGISTER:
162 /* Create the device node here after the network device has
163 * been registered but before register_netdevice has
166 err = tap_get_minor(macvtap_major, &vlantap->tap);
168 return notifier_from_errno(err);
170 devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor);
171 classdev = device_create(&macvtap_class, &dev->dev, devt,
173 if (IS_ERR(classdev)) {
174 tap_free_minor(macvtap_major, &vlantap->tap);
175 return notifier_from_errno(PTR_ERR(classdev));
177 err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj,
180 return notifier_from_errno(err);
182 case NETDEV_UNREGISTER:
183 /* vlan->minor == 0 if NETDEV_REGISTER above failed */
184 if (vlantap->tap.minor == 0)
186 sysfs_remove_link(&dev->dev.kobj, tap_name);
187 devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor);
188 device_destroy(&macvtap_class, devt);
189 tap_free_minor(macvtap_major, &vlantap->tap);
191 case NETDEV_CHANGE_TX_QUEUE_LEN:
192 if (tap_queue_resize(&vlantap->tap))
200 static struct notifier_block macvtap_notifier_block __read_mostly = {
201 .notifier_call = macvtap_device_event,
204 static int macvtap_init(void)
208 err = tap_create_cdev(&macvtap_cdev, &macvtap_major, "macvtap");
213 err = class_register(&macvtap_class);
217 err = register_netdevice_notifier(&macvtap_notifier_block);
221 err = macvlan_link_register(&macvtap_link_ops);
228 unregister_netdevice_notifier(&macvtap_notifier_block);
230 class_unregister(&macvtap_class);
232 tap_destroy_cdev(macvtap_major, &macvtap_cdev);
236 module_init(macvtap_init);
238 static void macvtap_exit(void)
240 rtnl_link_unregister(&macvtap_link_ops);
241 unregister_netdevice_notifier(&macvtap_notifier_block);
242 class_unregister(&macvtap_class);
243 tap_destroy_cdev(macvtap_major, &macvtap_cdev);
245 module_exit(macvtap_exit);
247 MODULE_ALIAS_RTNL_LINK("macvtap");
248 MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
249 MODULE_LICENSE("GPL");