diff options
| -rw-r--r-- | drivers/net/Makefile | 2 | ||||
| -rw-r--r-- | drivers/net/macvtap_main.c | 218 | ||||
| -rw-r--r-- | drivers/net/tap.c (renamed from drivers/net/macvtap.c) | 204 | ||||
| -rw-r--r-- | include/linux/if_macvtap.h | 10 |
4 files changed, 238 insertions, 196 deletions
diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 7336cbd3ef5d..19b03a9fe0f6 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -29,6 +29,8 @@ obj-$(CONFIG_GTP) += gtp.o obj-$(CONFIG_NLMON) += nlmon.o obj-$(CONFIG_NET_VRF) += vrf.o +macvtap-objs := macvtap_main.o tap.o + # # Networking Drivers # diff --git a/drivers/net/macvtap_main.c b/drivers/net/macvtap_main.c new file mode 100644 index 000000000000..96ffa60c5a36 --- /dev/null +++ b/drivers/net/macvtap_main.c @@ -0,0 +1,218 @@ +#include <linux/etherdevice.h> +#include <linux/if_macvlan.h> +#include <linux/if_macvtap.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> + +/* + * Variables for dealing with macvtaps device numbers. + */ +static dev_t macvtap_major; +#define MACVTAP_NUM_DEVS (1U << MINORBITS) + +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 int macvtap_newlink(struct net *src_net, + struct net_device *dev, + struct nlattr *tb[], + struct nlattr *data[]) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + int err; + + INIT_LIST_HEAD(&vlan->queue_list); + + /* Since macvlan supports all offloads by default, make + * tap support all offloads also. + */ + vlan->tap_features = TUN_OFFLOADS; + + err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan); + 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; + } + + return 0; +} + +static void macvtap_dellink(struct net_device *dev, + struct list_head *head) +{ + netdev_rx_handler_unregister(dev); + macvtap_del_queues(dev); + 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, +}; + +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 macvlan_dev *vlan; + 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); + vlan = 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 = macvtap_get_minor(vlan); + if (err) + return notifier_from_errno(err); + + devt = MKDEV(MAJOR(macvtap_major), vlan->minor); + classdev = device_create(&macvtap_class, &dev->dev, devt, + dev, tap_name); + if (IS_ERR(classdev)) { + macvtap_free_minor(vlan); + 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 (vlan->minor == 0) + break; + sysfs_remove_link(&dev->dev.kobj, tap_name); + devt = MKDEV(MAJOR(macvtap_major), vlan->minor); + device_destroy(&macvtap_class, devt); + macvtap_free_minor(vlan); + break; + case NETDEV_CHANGE_TX_QUEUE_LEN: + if (macvtap_queue_resize(vlan)) + return NOTIFY_BAD; + break; + } + + return NOTIFY_DONE; +} + +static struct notifier_block macvtap_notifier_block __read_mostly = { + .notifier_call = macvtap_device_event, +}; + +extern struct file_operations macvtap_fops; +static int macvtap_init(void) +{ + int err; + + err = alloc_chrdev_region(&macvtap_major, 0, + MACVTAP_NUM_DEVS, "macvtap"); + if (err) + goto out1; + + cdev_init(&macvtap_cdev, &macvtap_fops); + err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); + if (err) + goto out2; + + err = class_register(&macvtap_class); + if (err) + goto out3; + + err = register_netdevice_notifier(&macvtap_notifier_block); + if (err) + goto out4; + + err = macvlan_link_register(&macvtap_link_ops); + if (err) + goto out5; + + return 0; + +out5: + unregister_netdevice_notifier(&macvtap_notifier_block); +out4: + class_unregister(&macvtap_class); +out3: + cdev_del(&macvtap_cdev); +out2: + unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); +out1: + return err; +} +module_init(macvtap_init); + +extern struct idr minor_idr; +static void macvtap_exit(void) +{ + rtnl_link_unregister(&macvtap_link_ops); + unregister_netdevice_notifier(&macvtap_notifier_block); + class_unregister(&macvtap_class); + cdev_del(&macvtap_cdev); + unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); + idr_destroy(&minor_idr); +} +module_exit(macvtap_exit); + +MODULE_ALIAS_RTNL_LINK("macvtap"); +MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/net/macvtap.c b/drivers/net/tap.c index c27011bbe30c..6f6228e4fd3f 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/tap.c @@ -122,33 +122,14 @@ static struct proto macvtap_proto = { .obj_size = sizeof (struct macvtap_queue), }; -/* - * Variables for dealing with macvtaps device numbers. - */ -static dev_t macvtap_major; #define MACVTAP_NUM_DEVS (1U << MINORBITS) static DEFINE_MUTEX(minor_lock); -static DEFINE_IDR(minor_idr); +DEFINE_IDR(minor_idr); #define GOODCOPY_LEN 128 -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; static const struct proto_ops macvtap_socket_ops; -#define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ - NETIF_F_TSO6 | NETIF_F_UFO) #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO) #define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST) @@ -332,7 +313,7 @@ out: * that it holds on all queues and safely set the pointer * from the queues to NULL. */ -static void macvtap_del_queues(struct net_device *dev) +void macvtap_del_queues(struct net_device *dev) { struct macvlan_dev *vlan = netdev_priv(dev); struct macvtap_queue *q, *tmp; @@ -352,7 +333,7 @@ static void macvtap_del_queues(struct net_device *dev) vlan->numvtaps = MAX_MACVTAP_QUEUES; } -static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb) +rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb) { struct sk_buff *skb = *pskb; struct net_device *dev = skb->dev; @@ -407,7 +388,7 @@ static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb) /* If we receive a partial checksum and the tap side * doesn't support checksum offload, compute the checksum. * Note: it doesn't matter which checksum feature to - * check, we either support them all or none. + * check, we either support them all or none. */ if (skb->ip_summed == CHECKSUM_PARTIAL && !(features & NETIF_F_CSUM_MASK) && @@ -428,7 +409,7 @@ drop: return RX_HANDLER_CONSUMED; } -static int macvtap_get_minor(struct macvlan_dev *vlan) +int macvtap_get_minor(struct macvlan_dev *vlan) { int retval = -ENOMEM; @@ -444,7 +425,7 @@ static int macvtap_get_minor(struct macvlan_dev *vlan) return retval < 0 ? retval : 0; } -static void macvtap_free_minor(struct macvlan_dev *vlan) +void macvtap_free_minor(struct macvlan_dev *vlan) { mutex_lock(&minor_lock); if (vlan->minor) { @@ -469,59 +450,6 @@ static struct net_device *dev_get_by_macvtap_minor(int minor) return dev; } -static int macvtap_newlink(struct net *src_net, - struct net_device *dev, - struct nlattr *tb[], - struct nlattr *data[]) -{ - struct macvlan_dev *vlan = netdev_priv(dev); - int err; - - INIT_LIST_HEAD(&vlan->queue_list); - - /* Since macvlan supports all offloads by default, make - * tap support all offloads also. - */ - vlan->tap_features = TUN_OFFLOADS; - - err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan); - 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; - } - - return 0; -} - -static void macvtap_dellink(struct net_device *dev, - struct list_head *head) -{ - netdev_rx_handler_unregister(dev); - macvtap_del_queues(dev); - 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, -}; - - static void macvtap_sock_write_space(struct sock *sk) { wait_queue_head_t *wqueue; @@ -1169,7 +1097,7 @@ static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, } #endif -static const struct file_operations macvtap_fops = { +const struct file_operations macvtap_fops = { .owner = THIS_MODULE, .open = macvtap_open, .release = macvtap_release, @@ -1235,7 +1163,7 @@ struct socket *macvtap_get_socket(struct file *file) } EXPORT_SYMBOL_GPL(macvtap_get_socket); -static int macvtap_queue_resize(struct macvlan_dev *vlan) +int macvtap_queue_resize(struct macvlan_dev *vlan) { struct net_device *dev = vlan->dev; struct macvtap_queue *q; @@ -1256,119 +1184,3 @@ static int macvtap_queue_resize(struct macvlan_dev *vlan) kfree(arrays); return ret; } - -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 macvlan_dev *vlan; - 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); - vlan = 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 = macvtap_get_minor(vlan); - if (err) - return notifier_from_errno(err); - - devt = MKDEV(MAJOR(macvtap_major), vlan->minor); - classdev = device_create(&macvtap_class, &dev->dev, devt, - dev, tap_name); - if (IS_ERR(classdev)) { - macvtap_free_minor(vlan); - 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 (vlan->minor == 0) - break; - sysfs_remove_link(&dev->dev.kobj, tap_name); - devt = MKDEV(MAJOR(macvtap_major), vlan->minor); - device_destroy(&macvtap_class, devt); - macvtap_free_minor(vlan); - break; - case NETDEV_CHANGE_TX_QUEUE_LEN: - if (macvtap_queue_resize(vlan)) - 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 = alloc_chrdev_region(&macvtap_major, 0, - MACVTAP_NUM_DEVS, "macvtap"); - if (err) - goto out1; - - cdev_init(&macvtap_cdev, &macvtap_fops); - err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); - if (err) - goto out2; - - err = class_register(&macvtap_class); - if (err) - goto out3; - - err = register_netdevice_notifier(&macvtap_notifier_block); - if (err) - goto out4; - - err = macvlan_link_register(&macvtap_link_ops); - if (err) - goto out5; - - return 0; - -out5: - unregister_netdevice_notifier(&macvtap_notifier_block); -out4: - class_unregister(&macvtap_class); -out3: - cdev_del(&macvtap_cdev); -out2: - unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); -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); - cdev_del(&macvtap_cdev); - unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); - idr_destroy(&minor_idr); -} -module_exit(macvtap_exit); - -MODULE_ALIAS_RTNL_LINK("macvtap"); -MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); -MODULE_LICENSE("GPL"); diff --git a/include/linux/if_macvtap.h b/include/linux/if_macvtap.h new file mode 100644 index 000000000000..c9bf84b75b27 --- /dev/null +++ b/include/linux/if_macvtap.h @@ -0,0 +1,10 @@ +#ifndef _LINUX_IF_MACVTAP_H_ +#define _LINUX_IF_MACVTAP_H_ + +rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb); +void macvtap_del_queues(struct net_device *dev); +int macvtap_get_minor(struct macvlan_dev *vlan); +void macvtap_free_minor(struct macvlan_dev *vlan); +int macvtap_queue_resize(struct macvlan_dev *vlan); + +#endif /*_LINUX_IF_MACVTAP_H_*/ |