diff options
Diffstat (limited to 'drivers/net/ipvlan/ipvtap.c')
| -rw-r--r-- | drivers/net/ipvlan/ipvtap.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/net/ipvlan/ipvtap.c b/drivers/net/ipvlan/ipvtap.c new file mode 100644 index 000000000..cbabca167 --- /dev/null +++ b/drivers/net/ipvlan/ipvtap.c @@ -0,0 +1,241 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/etherdevice.h> +#include "ipvlan.h" +#include <linux/if_vlan.h> +#include <linux/if_tap.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> + +#define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ + NETIF_F_TSO6) + +static dev_t ipvtap_major; +static struct cdev ipvtap_cdev; + +static const void *ipvtap_net_namespace(struct device *d) +{ + struct net_device *dev = to_net_dev(d->parent); + return dev_net(dev); +} + +static struct class ipvtap_class = { + .name = "ipvtap", + .owner = THIS_MODULE, + .ns_type = &net_ns_type_operations, + .namespace = ipvtap_net_namespace, +}; + +struct ipvtap_dev { + struct ipvl_dev vlan; + struct tap_dev tap; +}; + +static void ipvtap_count_tx_dropped(struct tap_dev *tap) +{ + struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap); + struct ipvl_dev *vlan = &vlantap->vlan; + + this_cpu_inc(vlan->pcpu_stats->tx_drps); +} + +static void ipvtap_count_rx_dropped(struct tap_dev *tap) +{ + struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap); + struct ipvl_dev *vlan = &vlantap->vlan; + + ipvlan_count_rx(vlan, 0, 0, 0); +} + +static void ipvtap_update_features(struct tap_dev *tap, + netdev_features_t features) +{ + struct ipvtap_dev *vlantap = container_of(tap, struct ipvtap_dev, tap); + struct ipvl_dev *vlan = &vlantap->vlan; + + vlan->sfeatures = features; + netdev_update_features(vlan->dev); +} + +static int ipvtap_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct ipvtap_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; + vlantap->tap.count_tx_dropped = ipvtap_count_tx_dropped; + vlantap->tap.update_features = ipvtap_update_features; + vlantap->tap.count_rx_dropped = ipvtap_count_rx_dropped; + + 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 = ipvlan_link_new(src_net, dev, tb, data, extack); + if (err) { + netdev_rx_handler_unregister(dev); + return err; + } + + vlantap->tap.dev = vlantap->vlan.dev; + + return err; +} + +static void ipvtap_dellink(struct net_device *dev, + struct list_head *head) +{ + struct ipvtap_dev *vlan = netdev_priv(dev); + + netdev_rx_handler_unregister(dev); + tap_del_queues(&vlan->tap); + ipvlan_link_delete(dev, head); +} + +static void ipvtap_setup(struct net_device *dev) +{ + ipvlan_link_setup(dev); + dev->tx_queue_len = TUN_READQ_SIZE; + dev->priv_flags &= ~IFF_NO_QUEUE; +} + +static struct rtnl_link_ops ipvtap_link_ops __read_mostly = { + .kind = "ipvtap", + .setup = ipvtap_setup, + .newlink = ipvtap_newlink, + .dellink = ipvtap_dellink, + .priv_size = sizeof(struct ipvtap_dev), +}; + +static int ipvtap_device_event(struct notifier_block *unused, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct ipvtap_dev *vlantap; + struct device *classdev; + dev_t devt; + int err; + char tap_name[IFNAMSIZ]; + + if (dev->rtnl_link_ops != &ipvtap_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(ipvtap_major, &vlantap->tap); + if (err) + return notifier_from_errno(err); + + devt = MKDEV(MAJOR(ipvtap_major), vlantap->tap.minor); + classdev = device_create(&ipvtap_class, &dev->dev, devt, + dev, "%s", tap_name); + if (IS_ERR(classdev)) { + tap_free_minor(ipvtap_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(ipvtap_major), vlantap->tap.minor); + device_destroy(&ipvtap_class, devt); + tap_free_minor(ipvtap_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 ipvtap_notifier_block __read_mostly = { + .notifier_call = ipvtap_device_event, +}; + +static int __init ipvtap_init(void) +{ + int err; + + err = tap_create_cdev(&ipvtap_cdev, &ipvtap_major, "ipvtap", + THIS_MODULE); + if (err) + goto out1; + + err = class_register(&ipvtap_class); + if (err) + goto out2; + + err = register_netdevice_notifier(&ipvtap_notifier_block); + if (err) + goto out3; + + err = ipvlan_link_register(&ipvtap_link_ops); + if (err) + goto out4; + + return 0; + +out4: + unregister_netdevice_notifier(&ipvtap_notifier_block); +out3: + class_unregister(&ipvtap_class); +out2: + tap_destroy_cdev(ipvtap_major, &ipvtap_cdev); +out1: + return err; +} +module_init(ipvtap_init); + +static void __exit ipvtap_exit(void) +{ + rtnl_link_unregister(&ipvtap_link_ops); + unregister_netdevice_notifier(&ipvtap_notifier_block); + class_unregister(&ipvtap_class); + tap_destroy_cdev(ipvtap_major, &ipvtap_cdev); +} +module_exit(ipvtap_exit); +MODULE_ALIAS_RTNL_LINK("ipvtap"); +MODULE_AUTHOR("Sainath Grandhi <sainath.grandhi@intel.com>"); +MODULE_LICENSE("GPL"); |