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