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249 lines
6.1 KiB
249 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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