| #include <linux/etherdevice.h> |
| #include <linux/if_macvlan.h> |
| #include <linux/if_tap.h> |
| #include <linux/if_vlan.h> |
| #include <linux/interrupt.h> |
| #include <linux/nsproxy.h> |
| #include <linux/compat.h> |
| #include <linux/if_tun.h> |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/cache.h> |
| #include <linux/sched.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/wait.h> |
| #include <linux/cdev.h> |
| #include <linux/idr.h> |
| #include <linux/fs.h> |
| #include <linux/uio.h> |
| |
| #include <net/net_namespace.h> |
| #include <net/rtnetlink.h> |
| #include <net/sock.h> |
| #include <linux/virtio_net.h> |
| #include <linux/skb_array.h> |
| |
| struct macvtap_dev { |
| struct macvlan_dev vlan; |
| struct tap_dev tap; |
| }; |
| |
| /* |
| * Variables for dealing with macvtaps device numbers. |
| */ |
| static dev_t macvtap_major; |
| |
| static const void *macvtap_net_namespace(struct device *d) |
| { |
| struct net_device *dev = to_net_dev(d->parent); |
| return dev_net(dev); |
| } |
| |
| static struct class macvtap_class = { |
| .name = "macvtap", |
| .owner = THIS_MODULE, |
| .ns_type = &net_ns_type_operations, |
| .namespace = macvtap_net_namespace, |
| }; |
| static struct cdev macvtap_cdev; |
| |
| #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ |
| NETIF_F_TSO6 | NETIF_F_UFO) |
| |
| static void macvtap_count_tx_dropped(struct tap_dev *tap) |
| { |
| struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); |
| struct macvlan_dev *vlan = &vlantap->vlan; |
| |
| this_cpu_inc(vlan->pcpu_stats->tx_dropped); |
| } |
| |
| static void macvtap_count_rx_dropped(struct tap_dev *tap) |
| { |
| struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); |
| struct macvlan_dev *vlan = &vlantap->vlan; |
| |
| macvlan_count_rx(vlan, 0, 0, 0); |
| } |
| |
| static void macvtap_update_features(struct tap_dev *tap, |
| netdev_features_t features) |
| { |
| struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); |
| struct macvlan_dev *vlan = &vlantap->vlan; |
| |
| vlan->set_features = features; |
| netdev_update_features(vlan->dev); |
| } |
| |
| static int macvtap_newlink(struct net *src_net, |
| struct net_device *dev, |
| struct nlattr *tb[], |
| struct nlattr *data[]) |
| { |
| struct macvtap_dev *vlantap = netdev_priv(dev); |
| int err; |
| |
| INIT_LIST_HEAD(&vlantap->tap.queue_list); |
| |
| /* Since macvlan supports all offloads by default, make |
| * tap support all offloads also. |
| */ |
| vlantap->tap.tap_features = TUN_OFFLOADS; |
| |
| /* Register callbacks for rx/tx drops accounting and updating |
| * net_device features |
| */ |
| vlantap->tap.count_tx_dropped = macvtap_count_tx_dropped; |
| vlantap->tap.count_rx_dropped = macvtap_count_rx_dropped; |
| vlantap->tap.update_features = macvtap_update_features; |
| |
| err = netdev_rx_handler_register(dev, tap_handle_frame, &vlantap->tap); |
| if (err) |
| return err; |
| |
| /* Don't put anything that may fail after macvlan_common_newlink |
| * because we can't undo what it does. |
| */ |
| err = macvlan_common_newlink(src_net, dev, tb, data); |
| if (err) { |
| netdev_rx_handler_unregister(dev); |
| return err; |
| } |
| |
| vlantap->tap.dev = vlantap->vlan.dev; |
| |
| return 0; |
| } |
| |
| static void macvtap_dellink(struct net_device *dev, |
| struct list_head *head) |
| { |
| struct macvtap_dev *vlantap = netdev_priv(dev); |
| |
| netdev_rx_handler_unregister(dev); |
| tap_del_queues(&vlantap->tap); |
| macvlan_dellink(dev, head); |
| } |
| |
| static void macvtap_setup(struct net_device *dev) |
| { |
| macvlan_common_setup(dev); |
| dev->tx_queue_len = TUN_READQ_SIZE; |
| } |
| |
| static struct rtnl_link_ops macvtap_link_ops __read_mostly = { |
| .kind = "macvtap", |
| .setup = macvtap_setup, |
| .newlink = macvtap_newlink, |
| .dellink = macvtap_dellink, |
| .priv_size = sizeof(struct macvtap_dev), |
| }; |
| |
| static int macvtap_device_event(struct notifier_block *unused, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| struct macvtap_dev *vlantap; |
| struct device *classdev; |
| dev_t devt; |
| int err; |
| char tap_name[IFNAMSIZ]; |
| |
| if (dev->rtnl_link_ops != &macvtap_link_ops) |
| return NOTIFY_DONE; |
| |
| snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex); |
| vlantap = netdev_priv(dev); |
| |
| switch (event) { |
| case NETDEV_REGISTER: |
| /* Create the device node here after the network device has |
| * been registered but before register_netdevice has |
| * finished running. |
| */ |
| err = tap_get_minor(macvtap_major, &vlantap->tap); |
| if (err) |
| return notifier_from_errno(err); |
| |
| devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor); |
| classdev = device_create(&macvtap_class, &dev->dev, devt, |
| dev, tap_name); |
| if (IS_ERR(classdev)) { |
| tap_free_minor(macvtap_major, &vlantap->tap); |
| return notifier_from_errno(PTR_ERR(classdev)); |
| } |
| err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj, |
| tap_name); |
| if (err) |
| return notifier_from_errno(err); |
| break; |
| case NETDEV_UNREGISTER: |
| /* vlan->minor == 0 if NETDEV_REGISTER above failed */ |
| if (vlantap->tap.minor == 0) |
| break; |
| sysfs_remove_link(&dev->dev.kobj, tap_name); |
| devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor); |
| device_destroy(&macvtap_class, devt); |
| tap_free_minor(macvtap_major, &vlantap->tap); |
| break; |
| case NETDEV_CHANGE_TX_QUEUE_LEN: |
| if (tap_queue_resize(&vlantap->tap)) |
| return NOTIFY_BAD; |
| break; |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block macvtap_notifier_block __read_mostly = { |
| .notifier_call = macvtap_device_event, |
| }; |
| |
| static int macvtap_init(void) |
| { |
| int err; |
| |
| err = tap_create_cdev(&macvtap_cdev, &macvtap_major, "macvtap"); |
| |
| if (err) |
| goto out1; |
| |
| err = class_register(&macvtap_class); |
| if (err) |
| goto out2; |
| |
| err = register_netdevice_notifier(&macvtap_notifier_block); |
| if (err) |
| goto out3; |
| |
| err = macvlan_link_register(&macvtap_link_ops); |
| if (err) |
| goto out4; |
| |
| return 0; |
| |
| out4: |
| unregister_netdevice_notifier(&macvtap_notifier_block); |
| out3: |
| class_unregister(&macvtap_class); |
| out2: |
| tap_destroy_cdev(macvtap_major, &macvtap_cdev); |
| out1: |
| return err; |
| } |
| module_init(macvtap_init); |
| |
| static void macvtap_exit(void) |
| { |
| rtnl_link_unregister(&macvtap_link_ops); |
| unregister_netdevice_notifier(&macvtap_notifier_block); |
| class_unregister(&macvtap_class); |
| tap_destroy_cdev(macvtap_major, &macvtap_cdev); |
| } |
| module_exit(macvtap_exit); |
| |
| MODULE_ALIAS_RTNL_LINK("macvtap"); |
| MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); |
| MODULE_LICENSE("GPL"); |