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- // SPDX-License-Identifier: GPL-2.0-only
- #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/signal.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)
- 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 netlink_ext_ack *extack)
- {
- 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, extack);
- 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",
- THIS_MODULE);
- 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");
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