net: macvtap driver
In order to use macvlan with qemu and other tools that require a tap file descriptor, the macvtap driver adds a small backend with a character device with the same interface as the tun driver, with a minimum set of features. Macvtap interfaces are created in the same way as macvlan interfaces using ip link, but the netif is just used as a handle for configuration and accounting, while the data goes through the chardev. Each macvtap interface has its own character device, simplifying permission management significantly over the generic tun/tap driver. Cc: Patrick McHardy <kaber@trash.net> Cc: Stephen Hemminger <shemminger@linux-foundation.org> Cc: David S. Miller" <davem@davemloft.net> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Or Gerlitz <ogerlitz@voltaire.com> Cc: netdev@vger.kernel.org Cc: bridge@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann
David S. Miller
Родитель
fc0663d6b5
Коммит
20d29d7a91
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@ -90,6 +90,18 @@ config MACVLAN
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To compile this driver as a module, choose M here: the module
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will be called macvlan.
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config MACVTAP
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tristate "MAC-VLAN based tap driver (EXPERIMENTAL)"
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depends on MACVLAN
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help
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This adds a specialized tap character device driver that is based
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on the MAC-VLAN network interface, called macvtap. A macvtap device
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can be added in the same way as a macvlan device, using 'type
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macvlan', and then be accessed through the tap user space interface.
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To compile this driver as a module, choose M here: the module
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will be called macvtap.
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config EQUALIZER
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tristate "EQL (serial line load balancing) support"
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---help---
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@ -169,6 +169,7 @@ obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o
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obj-$(CONFIG_DUMMY) += dummy.o
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obj-$(CONFIG_IFB) += ifb.o
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obj-$(CONFIG_MACVLAN) += macvlan.o
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obj-$(CONFIG_MACVTAP) += macvtap.o
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obj-$(CONFIG_DE600) += de600.o
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obj-$(CONFIG_DE620) += de620.o
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obj-$(CONFIG_LANCE) += lance.o
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@ -0,0 +1,581 @@
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#include <linux/etherdevice.h>
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#include <linux/if_macvlan.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.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/cdev.h>
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#include <linux/fs.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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/*
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* A macvtap queue is the central object of this driver, it connects
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* an open character device to a macvlan interface. There can be
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* multiple queues on one interface, which map back to queues
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* implemented in hardware on the underlying device.
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*
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* macvtap_proto is used to allocate queues through the sock allocation
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* mechanism.
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*
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* TODO: multiqueue support is currently not implemented, even though
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* macvtap is basically prepared for that. We will need to add this
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* here as well as in virtio-net and qemu to get line rate on 10gbit
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* adapters from a guest.
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*/
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struct macvtap_queue {
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struct sock sk;
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struct socket sock;
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struct macvlan_dev *vlan;
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struct file *file;
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};
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static struct proto macvtap_proto = {
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.name = "macvtap",
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.owner = THIS_MODULE,
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.obj_size = sizeof (struct macvtap_queue),
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};
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/*
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* Minor number matches netdev->ifindex, so need a potentially
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* large value. This also makes it possible to split the
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* tap functionality out again in the future by offering it
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* from other drivers besides macvtap. As long as every device
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* only has one tap, the interface numbers assure that the
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* device nodes are unique.
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*/
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static unsigned int macvtap_major;
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#define MACVTAP_NUM_DEVS 65536
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static struct class *macvtap_class;
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static struct cdev macvtap_cdev;
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/*
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* RCU usage:
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* The macvtap_queue is referenced both from the chardev struct file
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* and from the struct macvlan_dev using rcu_read_lock.
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*
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* We never actually update the contents of a macvtap_queue atomically
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* with RCU but it is used for race-free destruction of a queue when
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* either the file or the macvlan_dev goes away. Pointers back to
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* the dev and the file are implicitly valid as long as the queue
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* exists.
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*
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* The callbacks from macvlan are always done with rcu_read_lock held
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* already, while in the file_operations, we get it ourselves.
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*
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* When destroying a queue, we remove the pointers from the file and
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* from the dev and then synchronize_rcu to make sure no thread is
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* still using the queue. There may still be references to the struct
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* sock inside of the queue from outbound SKBs, but these never
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* reference back to the file or the dev. The data structure is freed
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* through __sk_free when both our references and any pending SKBs
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* are gone.
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*
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* macvtap_lock is only used to prevent multiple concurrent open()
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* calls to assign a new vlan->tap pointer. It could be moved into
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* the macvlan_dev itself but is extremely rarely used.
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*/
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static DEFINE_SPINLOCK(macvtap_lock);
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/*
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* Choose the next free queue, for now there is only one
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*/
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static int macvtap_set_queue(struct net_device *dev, struct file *file,
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struct macvtap_queue *q)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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int err = -EBUSY;
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spin_lock(&macvtap_lock);
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if (rcu_dereference(vlan->tap))
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goto out;
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err = 0;
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q->vlan = vlan;
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rcu_assign_pointer(vlan->tap, q);
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q->file = file;
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rcu_assign_pointer(file->private_data, q);
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out:
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spin_unlock(&macvtap_lock);
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return err;
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}
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/*
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* We must destroy each queue exactly once, when either
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* the netdev or the file go away.
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*
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* Using the spinlock makes sure that we don't get
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* to the queue again after destroying it.
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*
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* synchronize_rcu serializes with the packet flow
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* that uses rcu_read_lock.
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*/
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static void macvtap_del_queue(struct macvtap_queue **qp)
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{
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struct macvtap_queue *q;
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spin_lock(&macvtap_lock);
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q = rcu_dereference(*qp);
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if (!q) {
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spin_unlock(&macvtap_lock);
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return;
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}
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rcu_assign_pointer(q->vlan->tap, NULL);
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rcu_assign_pointer(q->file->private_data, NULL);
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spin_unlock(&macvtap_lock);
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synchronize_rcu();
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sock_put(&q->sk);
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}
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/*
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* Since we only support one queue, just dereference the pointer.
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*/
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static struct macvtap_queue *macvtap_get_queue(struct net_device *dev,
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struct sk_buff *skb)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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return rcu_dereference(vlan->tap);
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}
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static void macvtap_del_queues(struct net_device *dev)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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macvtap_del_queue(&vlan->tap);
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}
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static inline struct macvtap_queue *macvtap_file_get_queue(struct file *file)
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{
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rcu_read_lock_bh();
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return rcu_dereference(file->private_data);
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}
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static inline void macvtap_file_put_queue(void)
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{
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rcu_read_unlock_bh();
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}
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/*
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* Forward happens for data that gets sent from one macvlan
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* endpoint to another one in bridge mode. We just take
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* the skb and put it into the receive queue.
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*/
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static int macvtap_forward(struct net_device *dev, struct sk_buff *skb)
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{
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struct macvtap_queue *q = macvtap_get_queue(dev, skb);
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if (!q)
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return -ENOLINK;
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skb_queue_tail(&q->sk.sk_receive_queue, skb);
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wake_up(q->sk.sk_sleep);
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return 0;
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}
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/*
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* Receive is for data from the external interface (lowerdev),
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* in case of macvtap, we can treat that the same way as
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* forward, which macvlan cannot.
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*/
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static int macvtap_receive(struct sk_buff *skb)
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{
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skb_push(skb, ETH_HLEN);
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return macvtap_forward(skb->dev, skb);
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}
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static int macvtap_newlink(struct net *src_net,
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struct net_device *dev,
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struct nlattr *tb[],
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struct nlattr *data[])
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{
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struct device *classdev;
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dev_t devt;
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int err;
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err = macvlan_common_newlink(src_net, dev, tb, data,
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macvtap_receive, macvtap_forward);
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if (err)
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goto out;
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devt = MKDEV(MAJOR(macvtap_major), dev->ifindex);
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classdev = device_create(macvtap_class, &dev->dev, devt,
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dev, "tap%d", dev->ifindex);
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if (IS_ERR(classdev)) {
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err = PTR_ERR(classdev);
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macvtap_del_queues(dev);
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}
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out:
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return err;
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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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device_destroy(macvtap_class,
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MKDEV(MAJOR(macvtap_major), dev->ifindex));
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macvtap_del_queues(dev);
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macvlan_dellink(dev, head);
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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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.newlink = macvtap_newlink,
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.dellink = macvtap_dellink,
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};
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static void macvtap_sock_write_space(struct sock *sk)
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{
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if (!sock_writeable(sk) ||
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!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
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return;
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if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
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wake_up_interruptible_sync(sk->sk_sleep);
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}
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static int macvtap_open(struct inode *inode, struct file *file)
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{
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struct net *net = current->nsproxy->net_ns;
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struct net_device *dev = dev_get_by_index(net, iminor(inode));
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struct macvtap_queue *q;
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int err;
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err = -ENODEV;
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if (!dev)
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goto out;
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/* check if this is a macvtap device */
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err = -EINVAL;
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if (dev->rtnl_link_ops != &macvtap_link_ops)
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goto out;
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err = -ENOMEM;
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q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
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&macvtap_proto);
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if (!q)
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goto out;
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init_waitqueue_head(&q->sock.wait);
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q->sock.type = SOCK_RAW;
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q->sock.state = SS_CONNECTED;
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sock_init_data(&q->sock, &q->sk);
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q->sk.sk_allocation = GFP_ATOMIC; /* for now */
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q->sk.sk_write_space = macvtap_sock_write_space;
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err = macvtap_set_queue(dev, file, q);
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if (err)
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sock_put(&q->sk);
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out:
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if (dev)
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dev_put(dev);
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return err;
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}
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static int macvtap_release(struct inode *inode, struct file *file)
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{
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macvtap_del_queue((struct macvtap_queue **)&file->private_data);
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return 0;
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}
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static unsigned int macvtap_poll(struct file *file, poll_table * wait)
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{
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struct macvtap_queue *q = macvtap_file_get_queue(file);
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unsigned int mask = POLLERR;
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if (!q)
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goto out;
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mask = 0;
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poll_wait(file, &q->sock.wait, wait);
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if (!skb_queue_empty(&q->sk.sk_receive_queue))
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mask |= POLLIN | POLLRDNORM;
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if (sock_writeable(&q->sk) ||
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(!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) &&
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sock_writeable(&q->sk)))
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mask |= POLLOUT | POLLWRNORM;
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out:
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macvtap_file_put_queue();
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return mask;
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}
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/* Get packet from user space buffer */
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static ssize_t macvtap_get_user(struct macvtap_queue *q,
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const struct iovec *iv, size_t count,
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int noblock)
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{
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struct sk_buff *skb;
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size_t len = count;
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int err;
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if (unlikely(len < ETH_HLEN))
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return -EINVAL;
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skb = sock_alloc_send_skb(&q->sk, NET_IP_ALIGN + len, noblock, &err);
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if (!skb) {
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macvlan_count_rx(q->vlan, 0, false, false);
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return err;
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}
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skb_reserve(skb, NET_IP_ALIGN);
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skb_put(skb, count);
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if (skb_copy_datagram_from_iovec(skb, 0, iv, 0, len)) {
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macvlan_count_rx(q->vlan, 0, false, false);
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kfree_skb(skb);
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return -EFAULT;
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}
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skb_set_network_header(skb, ETH_HLEN);
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macvlan_start_xmit(skb, q->vlan->dev);
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return count;
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}
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static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv,
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unsigned long count, loff_t pos)
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{
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struct file *file = iocb->ki_filp;
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ssize_t result = -ENOLINK;
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struct macvtap_queue *q = macvtap_file_get_queue(file);
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if (!q)
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goto out;
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result = macvtap_get_user(q, iv, iov_length(iv, count),
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file->f_flags & O_NONBLOCK);
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||||
out:
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macvtap_file_put_queue();
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return result;
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}
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|
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/* Put packet to the user space buffer */
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static ssize_t macvtap_put_user(struct macvtap_queue *q,
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const struct sk_buff *skb,
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const struct iovec *iv, int len)
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||||
{
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struct macvlan_dev *vlan = q->vlan;
|
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int ret;
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||||
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len = min_t(int, skb->len, len);
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||||
|
||||
ret = skb_copy_datagram_const_iovec(skb, 0, iv, 0, len);
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||||
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macvlan_count_rx(vlan, len, ret == 0, 0);
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return ret ? ret : len;
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||||
}
|
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|
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static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv,
|
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unsigned long count, loff_t pos)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
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struct macvtap_queue *q = macvtap_file_get_queue(file);
|
||||
|
||||
DECLARE_WAITQUEUE(wait, current);
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||||
struct sk_buff *skb;
|
||||
ssize_t len, ret = 0;
|
||||
|
||||
if (!q) {
|
||||
ret = -ENOLINK;
|
||||
goto out;
|
||||
}
|
||||
|
||||
len = iov_length(iv, count);
|
||||
if (len < 0) {
|
||||
ret = -EINVAL;
|
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goto out;
|
||||
}
|
||||
|
||||
add_wait_queue(q->sk.sk_sleep, &wait);
|
||||
while (len) {
|
||||
current->state = TASK_INTERRUPTIBLE;
|
||||
|
||||
/* Read frames from the queue */
|
||||
skb = skb_dequeue(&q->sk.sk_receive_queue);
|
||||
if (!skb) {
|
||||
if (file->f_flags & O_NONBLOCK) {
|
||||
ret = -EAGAIN;
|
||||
break;
|
||||
}
|
||||
if (signal_pending(current)) {
|
||||
ret = -ERESTARTSYS;
|
||||
break;
|
||||
}
|
||||
/* Nothing to read, let's sleep */
|
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schedule();
|
||||
continue;
|
||||
}
|
||||
ret = macvtap_put_user(q, skb, iv, len);
|
||||
kfree_skb(skb);
|
||||
break;
|
||||
}
|
||||
|
||||
current->state = TASK_RUNNING;
|
||||
remove_wait_queue(q->sk.sk_sleep, &wait);
|
||||
|
||||
out:
|
||||
macvtap_file_put_queue();
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* provide compatibility with generic tun/tap interface
|
||||
*/
|
||||
static long macvtap_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
struct macvtap_queue *q;
|
||||
void __user *argp = (void __user *)arg;
|
||||
struct ifreq __user *ifr = argp;
|
||||
unsigned int __user *up = argp;
|
||||
unsigned int u;
|
||||
char devname[IFNAMSIZ];
|
||||
|
||||
switch (cmd) {
|
||||
case TUNSETIFF:
|
||||
/* ignore the name, just look at flags */
|
||||
if (get_user(u, &ifr->ifr_flags))
|
||||
return -EFAULT;
|
||||
if (u != (IFF_TAP | IFF_NO_PI))
|
||||
return -EINVAL;
|
||||
return 0;
|
||||
|
||||
case TUNGETIFF:
|
||||
q = macvtap_file_get_queue(file);
|
||||
if (!q)
|
||||
return -ENOLINK;
|
||||
memcpy(devname, q->vlan->dev->name, sizeof(devname));
|
||||
macvtap_file_put_queue();
|
||||
|
||||
if (copy_to_user(&ifr->ifr_name, q->vlan->dev->name, IFNAMSIZ) ||
|
||||
put_user((TUN_TAP_DEV | TUN_NO_PI), &ifr->ifr_flags))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
|
||||
case TUNGETFEATURES:
|
||||
if (put_user((IFF_TAP | IFF_NO_PI), up))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
|
||||
case TUNSETSNDBUF:
|
||||
if (get_user(u, up))
|
||||
return -EFAULT;
|
||||
|
||||
q = macvtap_file_get_queue(file);
|
||||
q->sk.sk_sndbuf = u;
|
||||
macvtap_file_put_queue();
|
||||
return 0;
|
||||
|
||||
case TUNSETOFFLOAD:
|
||||
/* let the user check for future flags */
|
||||
if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
|
||||
TUN_F_TSO_ECN | TUN_F_UFO))
|
||||
return -EINVAL;
|
||||
|
||||
/* TODO: add support for these, so far we don't
|
||||
support any offload */
|
||||
if (arg & (TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
|
||||
TUN_F_TSO_ECN | TUN_F_UFO))
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
static long macvtap_compat_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct file_operations macvtap_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = macvtap_open,
|
||||
.release = macvtap_release,
|
||||
.aio_read = macvtap_aio_read,
|
||||
.aio_write = macvtap_aio_write,
|
||||
.poll = macvtap_poll,
|
||||
.llseek = no_llseek,
|
||||
.unlocked_ioctl = macvtap_ioctl,
|
||||
#ifdef CONFIG_COMPAT
|
||||
.compat_ioctl = macvtap_compat_ioctl,
|
||||
#endif
|
||||
};
|
||||
|
||||
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;
|
||||
|
||||
macvtap_class = class_create(THIS_MODULE, "macvtap");
|
||||
if (IS_ERR(macvtap_class)) {
|
||||
err = PTR_ERR(macvtap_class);
|
||||
goto out3;
|
||||
}
|
||||
|
||||
err = macvlan_link_register(&macvtap_link_ops);
|
||||
if (err)
|
||||
goto out4;
|
||||
|
||||
return 0;
|
||||
|
||||
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);
|
||||
class_unregister(macvtap_class);
|
||||
cdev_del(&macvtap_cdev);
|
||||
unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
|
||||
}
|
||||
module_exit(macvtap_exit);
|
||||
|
||||
MODULE_ALIAS_RTNL_LINK("macvtap");
|
||||
MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -34,6 +34,7 @@ struct macvlan_dev {
|
|||
enum macvlan_mode mode;
|
||||
int (*receive)(struct sk_buff *skb);
|
||||
int (*forward)(struct net_device *dev, struct sk_buff *skb);
|
||||
struct macvtap_queue *tap;
|
||||
};
|
||||
|
||||
static inline void macvlan_count_rx(const struct macvlan_dev *vlan,
|
||||
|
|
|
|||
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