![Jason Wang](/assets/img/avatar_default.png)
We try to linearize part of the skb when the number of iov is greater than
MAX_SKB_FRAGS. This is not enough since each single vector may occupy more than
one pages, so zerocopy_sg_fromiovec() may still fail and may break the guest
network.
Solve this problem by calculate the pages needed for iov before trying to do
zerocopy and switch to use copy instead of zerocopy if it needs more than
MAX_SKB_FRAGS.
This is done through introducing a new helper to count the pages for iov, and
call uarg->callback() manually when switching from zerocopy to copy to notify
vhost.
We can do further optimization on top.
This bug were introduced from b92946e291
(macvtap: zerocopy: validate vectors before building skb).
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1343 lines
31 KiB
C
1343 lines
31 KiB
C
#include <linux/etherdevice.h>
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#include <linux/if_macvlan.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.h>
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#include <linux/types.h>
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#include <linux/slab.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/idr.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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#include <linux/virtio_net.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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*/
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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 socket_wq wq;
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int vnet_hdr_sz;
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struct macvlan_dev __rcu *vlan;
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struct file *file;
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unsigned int flags;
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u16 queue_index;
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bool enabled;
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struct list_head next;
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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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* Variables for dealing with macvtaps device numbers.
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*/
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static dev_t macvtap_major;
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#define MACVTAP_NUM_DEVS (1U << MINORBITS)
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static DEFINE_MUTEX(minor_lock);
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static DEFINE_IDR(minor_idr);
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#define GOODCOPY_LEN 128
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static struct class *macvtap_class;
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static struct cdev macvtap_cdev;
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static const struct proto_ops macvtap_socket_ops;
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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 | NETIF_F_UFO)
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#define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
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/*
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* RCU usage:
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* The macvtap_queue and the macvlan_dev are loosely coupled, the
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* pointers from one to the other can only be read while rcu_read_lock
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* or rtnl is held.
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*
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* Both the file and the macvlan_dev hold a reference on the macvtap_queue
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* through sock_hold(&q->sk). When the macvlan_dev goes away first,
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* q->vlan becomes inaccessible. When the files gets closed,
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* macvtap_get_queue() fails.
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*
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* There may still be references to the struct sock inside of the
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* queue from outbound SKBs, but these never reference back to the
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* file or the dev. The data structure is freed through __sk_free
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* when both our references and any pending SKBs are gone.
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*/
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static int macvtap_enable_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 = -EINVAL;
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ASSERT_RTNL();
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if (q->enabled)
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goto out;
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err = 0;
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rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
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q->queue_index = vlan->numvtaps;
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q->enabled = true;
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vlan->numvtaps++;
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out:
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return err;
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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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rtnl_lock();
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if (vlan->numqueues == MAX_MACVTAP_QUEUES)
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goto out;
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err = 0;
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rcu_assign_pointer(q->vlan, vlan);
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rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
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sock_hold(&q->sk);
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q->file = file;
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q->queue_index = vlan->numvtaps;
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q->enabled = true;
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file->private_data = q;
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list_add_tail(&q->next, &vlan->queue_list);
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vlan->numvtaps++;
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vlan->numqueues++;
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out:
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rtnl_unlock();
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return err;
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}
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static int macvtap_disable_queue(struct macvtap_queue *q)
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{
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struct macvlan_dev *vlan;
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struct macvtap_queue *nq;
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ASSERT_RTNL();
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if (!q->enabled)
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return -EINVAL;
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vlan = rtnl_dereference(q->vlan);
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if (vlan) {
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int index = q->queue_index;
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BUG_ON(index >= vlan->numvtaps);
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nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]);
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nq->queue_index = index;
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rcu_assign_pointer(vlan->taps[index], nq);
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RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL);
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q->enabled = false;
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vlan->numvtaps--;
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}
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return 0;
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}
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/*
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* The file owning the queue got closed, give up both
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* the reference that the files holds as well as the
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* one from the macvlan_dev if that still exists.
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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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static void macvtap_put_queue(struct macvtap_queue *q)
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{
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struct macvlan_dev *vlan;
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rtnl_lock();
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vlan = rtnl_dereference(q->vlan);
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if (vlan) {
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if (q->enabled)
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BUG_ON(macvtap_disable_queue(q));
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vlan->numqueues--;
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RCU_INIT_POINTER(q->vlan, NULL);
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sock_put(&q->sk);
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list_del_init(&q->next);
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}
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rtnl_unlock();
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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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* Select a queue based on the rxq of the device on which this packet
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* arrived. If the incoming device is not mq, calculate a flow hash
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* to select a queue. If all fails, find the first available queue.
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* Cache vlan->numvtaps since it can become zero during the execution
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* of this function.
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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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struct macvtap_queue *tap = NULL;
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/* Access to taps array is protected by rcu, but access to numvtaps
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* isn't. Below we use it to lookup a queue, but treat it as a hint
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* and validate that the result isn't NULL - in case we are
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* racing against queue removal.
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*/
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int numvtaps = ACCESS_ONCE(vlan->numvtaps);
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__u32 rxq;
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if (!numvtaps)
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goto out;
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/* Check if we can use flow to select a queue */
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rxq = skb_get_rxhash(skb);
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if (rxq) {
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tap = rcu_dereference(vlan->taps[rxq % numvtaps]);
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goto out;
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}
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if (likely(skb_rx_queue_recorded(skb))) {
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rxq = skb_get_rx_queue(skb);
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while (unlikely(rxq >= numvtaps))
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rxq -= numvtaps;
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tap = rcu_dereference(vlan->taps[rxq]);
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goto out;
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}
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tap = rcu_dereference(vlan->taps[0]);
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out:
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return tap;
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}
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/*
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* The net_device is going away, give up the reference
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* that it holds on all queues and safely set the pointer
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* from the queues to NULL.
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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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struct macvtap_queue *q, *tmp, *qlist[MAX_MACVTAP_QUEUES];
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int i, j = 0;
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ASSERT_RTNL();
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list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) {
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list_del_init(&q->next);
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qlist[j++] = q;
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RCU_INIT_POINTER(q->vlan, NULL);
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if (q->enabled)
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vlan->numvtaps--;
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vlan->numqueues--;
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}
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for (i = 0; i < vlan->numvtaps; i++)
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RCU_INIT_POINTER(vlan->taps[i], NULL);
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BUG_ON(vlan->numvtaps);
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BUG_ON(vlan->numqueues);
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/* guarantee that any future macvtap_set_queue will fail */
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vlan->numvtaps = MAX_MACVTAP_QUEUES;
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for (--j; j >= 0; j--)
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sock_put(&qlist[j]->sk);
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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 macvlan_dev *vlan = netdev_priv(dev);
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struct macvtap_queue *q = macvtap_get_queue(dev, skb);
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netdev_features_t features;
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if (!q)
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goto drop;
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if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len)
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goto drop;
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skb->dev = dev;
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/* Apply the forward feature mask so that we perform segmentation
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* according to users wishes.
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*/
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features = netif_skb_features(skb) & vlan->tap_features;
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if (netif_needs_gso(skb, features)) {
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struct sk_buff *segs = __skb_gso_segment(skb, features, false);
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if (IS_ERR(segs))
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goto drop;
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if (!segs) {
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skb_queue_tail(&q->sk.sk_receive_queue, skb);
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goto wake_up;
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}
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kfree_skb(skb);
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while (segs) {
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struct sk_buff *nskb = segs->next;
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segs->next = NULL;
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skb_queue_tail(&q->sk.sk_receive_queue, segs);
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segs = nskb;
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}
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} else {
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skb_queue_tail(&q->sk.sk_receive_queue, skb);
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}
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wake_up:
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wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND);
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return NET_RX_SUCCESS;
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drop:
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kfree_skb(skb);
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return NET_RX_DROP;
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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_get_minor(struct macvlan_dev *vlan)
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{
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int retval = -ENOMEM;
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mutex_lock(&minor_lock);
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retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL);
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if (retval >= 0) {
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vlan->minor = retval;
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} else if (retval == -ENOSPC) {
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printk(KERN_ERR "too many macvtap devices\n");
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retval = -EINVAL;
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}
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mutex_unlock(&minor_lock);
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return retval < 0 ? retval : 0;
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}
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static void macvtap_free_minor(struct macvlan_dev *vlan)
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{
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mutex_lock(&minor_lock);
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if (vlan->minor) {
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idr_remove(&minor_idr, vlan->minor);
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vlan->minor = 0;
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}
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mutex_unlock(&minor_lock);
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}
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static struct net_device *dev_get_by_macvtap_minor(int minor)
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{
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struct net_device *dev = NULL;
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struct macvlan_dev *vlan;
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mutex_lock(&minor_lock);
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vlan = idr_find(&minor_idr, minor);
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if (vlan) {
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dev = vlan->dev;
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dev_hold(dev);
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}
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mutex_unlock(&minor_lock);
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return dev;
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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 macvlan_dev *vlan = netdev_priv(dev);
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INIT_LIST_HEAD(&vlan->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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vlan->tap_features = TUN_OFFLOADS;
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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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return macvlan_common_newlink(src_net, dev, tb, data,
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macvtap_receive, macvtap_forward);
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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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macvtap_del_queues(dev);
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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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};
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static void macvtap_sock_write_space(struct sock *sk)
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{
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wait_queue_head_t *wqueue;
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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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wqueue = sk_sleep(sk);
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if (wqueue && waitqueue_active(wqueue))
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wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND);
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}
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static void macvtap_sock_destruct(struct sock *sk)
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{
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skb_queue_purge(&sk->sk_receive_queue);
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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_macvtap_minor(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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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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RCU_INIT_POINTER(q->sock.wq, &q->wq);
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init_waitqueue_head(&q->wq.wait);
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q->sock.type = SOCK_RAW;
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q->sock.state = SS_CONNECTED;
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q->sock.file = file;
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q->sock.ops = &macvtap_socket_ops;
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sock_init_data(&q->sock, &q->sk);
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q->sk.sk_write_space = macvtap_sock_write_space;
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q->sk.sk_destruct = macvtap_sock_destruct;
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q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
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q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
|
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|
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/*
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* so far only KVM virtio_net uses macvtap, enable zero copy between
|
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* guest kernel and host kernel when lower device supports zerocopy
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*
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* The macvlan supports zerocopy iff the lower device supports zero
|
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* copy so we don't have to look at the lower device directly.
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*/
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if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG))
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sock_set_flag(&q->sk, SOCK_ZEROCOPY);
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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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|
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static int macvtap_release(struct inode *inode, struct file *file)
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{
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struct macvtap_queue *q = file->private_data;
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macvtap_put_queue(q);
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return 0;
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}
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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 = file->private_data;
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unsigned int mask = POLLERR;
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|
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if (!q)
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goto out;
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|
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mask = 0;
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poll_wait(file, &q->wq.wait, wait);
|
|
|
|
if (!skb_queue_empty(&q->sk.sk_receive_queue))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
if (sock_writeable(&q->sk) ||
|
|
(!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) &&
|
|
sock_writeable(&q->sk)))
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
|
out:
|
|
return mask;
|
|
}
|
|
|
|
static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad,
|
|
size_t len, size_t linear,
|
|
int noblock, int *err)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
/* Under a page? Don't bother with paged skb. */
|
|
if (prepad + len < PAGE_SIZE || !linear)
|
|
linear = len;
|
|
|
|
skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
|
|
err);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
skb_reserve(skb, prepad);
|
|
skb_put(skb, linear);
|
|
skb->data_len = len - linear;
|
|
skb->len += len - linear;
|
|
|
|
return skb;
|
|
}
|
|
|
|
/* set skb frags from iovec, this can move to core network code for reuse */
|
|
static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
|
|
int offset, size_t count)
|
|
{
|
|
int len = iov_length(from, count) - offset;
|
|
int copy = skb_headlen(skb);
|
|
int size, offset1 = 0;
|
|
int i = 0;
|
|
|
|
/* Skip over from offset */
|
|
while (count && (offset >= from->iov_len)) {
|
|
offset -= from->iov_len;
|
|
++from;
|
|
--count;
|
|
}
|
|
|
|
/* copy up to skb headlen */
|
|
while (count && (copy > 0)) {
|
|
size = min_t(unsigned int, copy, from->iov_len - offset);
|
|
if (copy_from_user(skb->data + offset1, from->iov_base + offset,
|
|
size))
|
|
return -EFAULT;
|
|
if (copy > size) {
|
|
++from;
|
|
--count;
|
|
offset = 0;
|
|
} else
|
|
offset += size;
|
|
copy -= size;
|
|
offset1 += size;
|
|
}
|
|
|
|
if (len == offset1)
|
|
return 0;
|
|
|
|
while (count--) {
|
|
struct page *page[MAX_SKB_FRAGS];
|
|
int num_pages;
|
|
unsigned long base;
|
|
unsigned long truesize;
|
|
|
|
len = from->iov_len - offset;
|
|
if (!len) {
|
|
offset = 0;
|
|
++from;
|
|
continue;
|
|
}
|
|
base = (unsigned long)from->iov_base + offset;
|
|
size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
|
|
if (i + size > MAX_SKB_FRAGS)
|
|
return -EMSGSIZE;
|
|
num_pages = get_user_pages_fast(base, size, 0, &page[i]);
|
|
if (num_pages != size) {
|
|
int j;
|
|
|
|
for (j = 0; j < num_pages; j++)
|
|
put_page(page[i + j]);
|
|
return -EFAULT;
|
|
}
|
|
truesize = size * PAGE_SIZE;
|
|
skb->data_len += len;
|
|
skb->len += len;
|
|
skb->truesize += truesize;
|
|
atomic_add(truesize, &skb->sk->sk_wmem_alloc);
|
|
while (len) {
|
|
int off = base & ~PAGE_MASK;
|
|
int size = min_t(int, len, PAGE_SIZE - off);
|
|
__skb_fill_page_desc(skb, i, page[i], off, size);
|
|
skb_shinfo(skb)->nr_frags++;
|
|
/* increase sk_wmem_alloc */
|
|
base += size;
|
|
len -= size;
|
|
i++;
|
|
}
|
|
offset = 0;
|
|
++from;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should
|
|
* be shared with the tun/tap driver.
|
|
*/
|
|
static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb,
|
|
struct virtio_net_hdr *vnet_hdr)
|
|
{
|
|
unsigned short gso_type = 0;
|
|
if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
|
|
switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
|
|
case VIRTIO_NET_HDR_GSO_TCPV4:
|
|
gso_type = SKB_GSO_TCPV4;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_TCPV6:
|
|
gso_type = SKB_GSO_TCPV6;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_UDP:
|
|
gso_type = SKB_GSO_UDP;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
|
|
gso_type |= SKB_GSO_TCP_ECN;
|
|
|
|
if (vnet_hdr->gso_size == 0)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
|
|
if (!skb_partial_csum_set(skb, vnet_hdr->csum_start,
|
|
vnet_hdr->csum_offset))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
|
|
skb_shinfo(skb)->gso_size = vnet_hdr->gso_size;
|
|
skb_shinfo(skb)->gso_type = gso_type;
|
|
|
|
/* Header must be checked, and gso_segs computed. */
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
|
|
skb_shinfo(skb)->gso_segs = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
|
|
struct virtio_net_hdr *vnet_hdr)
|
|
{
|
|
memset(vnet_hdr, 0, sizeof(*vnet_hdr));
|
|
|
|
if (skb_is_gso(skb)) {
|
|
struct skb_shared_info *sinfo = skb_shinfo(skb);
|
|
|
|
/* This is a hint as to how much should be linear. */
|
|
vnet_hdr->hdr_len = skb_headlen(skb);
|
|
vnet_hdr->gso_size = sinfo->gso_size;
|
|
if (sinfo->gso_type & SKB_GSO_TCPV4)
|
|
vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
|
|
else if (sinfo->gso_type & SKB_GSO_TCPV6)
|
|
vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
|
|
else if (sinfo->gso_type & SKB_GSO_UDP)
|
|
vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
|
|
else
|
|
BUG();
|
|
if (sinfo->gso_type & SKB_GSO_TCP_ECN)
|
|
vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
|
|
} else
|
|
vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
|
|
vnet_hdr->csum_start = skb_checksum_start_offset(skb);
|
|
vnet_hdr->csum_offset = skb->csum_offset;
|
|
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
|
|
vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
|
|
} /* else everything is zero */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long iov_pages(const struct iovec *iv, int offset,
|
|
unsigned long nr_segs)
|
|
{
|
|
unsigned long seg, base;
|
|
int pages = 0, len, size;
|
|
|
|
while (nr_segs && (offset >= iv->iov_len)) {
|
|
offset -= iv->iov_len;
|
|
++iv;
|
|
--nr_segs;
|
|
}
|
|
|
|
for (seg = 0; seg < nr_segs; seg++) {
|
|
base = (unsigned long)iv[seg].iov_base + offset;
|
|
len = iv[seg].iov_len - offset;
|
|
size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
|
|
pages += size;
|
|
offset = 0;
|
|
}
|
|
|
|
return pages;
|
|
}
|
|
|
|
/* Get packet from user space buffer */
|
|
static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
|
|
const struct iovec *iv, unsigned long total_len,
|
|
size_t count, int noblock)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct macvlan_dev *vlan;
|
|
unsigned long len = total_len;
|
|
int err;
|
|
struct virtio_net_hdr vnet_hdr = { 0 };
|
|
int vnet_hdr_len = 0;
|
|
int copylen = 0;
|
|
bool zerocopy = false;
|
|
size_t linear;
|
|
|
|
if (q->flags & IFF_VNET_HDR) {
|
|
vnet_hdr_len = q->vnet_hdr_sz;
|
|
|
|
err = -EINVAL;
|
|
if (len < vnet_hdr_len)
|
|
goto err;
|
|
len -= vnet_hdr_len;
|
|
|
|
err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0,
|
|
sizeof(vnet_hdr));
|
|
if (err < 0)
|
|
goto err;
|
|
if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
|
|
vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
|
|
vnet_hdr.hdr_len)
|
|
vnet_hdr.hdr_len = vnet_hdr.csum_start +
|
|
vnet_hdr.csum_offset + 2;
|
|
err = -EINVAL;
|
|
if (vnet_hdr.hdr_len > len)
|
|
goto err;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
if (unlikely(len < ETH_HLEN))
|
|
goto err;
|
|
|
|
err = -EMSGSIZE;
|
|
if (unlikely(count > UIO_MAXIOV))
|
|
goto err;
|
|
|
|
if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) {
|
|
copylen = vnet_hdr.hdr_len ? vnet_hdr.hdr_len : GOODCOPY_LEN;
|
|
linear = copylen;
|
|
if (iov_pages(iv, vnet_hdr_len + copylen, count)
|
|
<= MAX_SKB_FRAGS)
|
|
zerocopy = true;
|
|
}
|
|
|
|
if (!zerocopy) {
|
|
copylen = len;
|
|
linear = vnet_hdr.hdr_len;
|
|
}
|
|
|
|
skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen,
|
|
linear, noblock, &err);
|
|
if (!skb)
|
|
goto err;
|
|
|
|
if (zerocopy)
|
|
err = zerocopy_sg_from_iovec(skb, iv, vnet_hdr_len, count);
|
|
else {
|
|
err = skb_copy_datagram_from_iovec(skb, 0, iv, vnet_hdr_len,
|
|
len);
|
|
if (!err && m && m->msg_control) {
|
|
struct ubuf_info *uarg = m->msg_control;
|
|
uarg->callback(uarg, false);
|
|
}
|
|
}
|
|
|
|
if (err)
|
|
goto err_kfree;
|
|
|
|
skb_set_network_header(skb, ETH_HLEN);
|
|
skb_reset_mac_header(skb);
|
|
skb->protocol = eth_hdr(skb)->h_proto;
|
|
|
|
if (vnet_hdr_len) {
|
|
err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr);
|
|
if (err)
|
|
goto err_kfree;
|
|
}
|
|
|
|
skb_probe_transport_header(skb, ETH_HLEN);
|
|
|
|
rcu_read_lock();
|
|
vlan = rcu_dereference(q->vlan);
|
|
/* copy skb_ubuf_info for callback when skb has no error */
|
|
if (zerocopy) {
|
|
skb_shinfo(skb)->destructor_arg = m->msg_control;
|
|
skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
|
|
skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
|
|
}
|
|
if (vlan)
|
|
macvlan_start_xmit(skb, vlan->dev);
|
|
else
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
|
|
return total_len;
|
|
|
|
err_kfree:
|
|
kfree_skb(skb);
|
|
|
|
err:
|
|
rcu_read_lock();
|
|
vlan = rcu_dereference(q->vlan);
|
|
if (vlan)
|
|
vlan->dev->stats.tx_dropped++;
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv,
|
|
unsigned long count, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
ssize_t result = -ENOLINK;
|
|
struct macvtap_queue *q = file->private_data;
|
|
|
|
result = macvtap_get_user(q, NULL, iv, iov_length(iv, count), count,
|
|
file->f_flags & O_NONBLOCK);
|
|
return result;
|
|
}
|
|
|
|
/* Put packet to the user space buffer */
|
|
static ssize_t macvtap_put_user(struct macvtap_queue *q,
|
|
const struct sk_buff *skb,
|
|
const struct iovec *iv, int len)
|
|
{
|
|
struct macvlan_dev *vlan;
|
|
int ret;
|
|
int vnet_hdr_len = 0;
|
|
int vlan_offset = 0;
|
|
int copied;
|
|
|
|
if (q->flags & IFF_VNET_HDR) {
|
|
struct virtio_net_hdr vnet_hdr;
|
|
vnet_hdr_len = q->vnet_hdr_sz;
|
|
if ((len -= vnet_hdr_len) < 0)
|
|
return -EINVAL;
|
|
|
|
ret = macvtap_skb_to_vnet_hdr(skb, &vnet_hdr);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr)))
|
|
return -EFAULT;
|
|
}
|
|
copied = vnet_hdr_len;
|
|
|
|
if (!vlan_tx_tag_present(skb))
|
|
len = min_t(int, skb->len, len);
|
|
else {
|
|
int copy;
|
|
struct {
|
|
__be16 h_vlan_proto;
|
|
__be16 h_vlan_TCI;
|
|
} veth;
|
|
veth.h_vlan_proto = skb->vlan_proto;
|
|
veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb));
|
|
|
|
vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
|
|
len = min_t(int, skb->len + VLAN_HLEN, len);
|
|
|
|
copy = min_t(int, vlan_offset, len);
|
|
ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy);
|
|
len -= copy;
|
|
copied += copy;
|
|
if (ret || !len)
|
|
goto done;
|
|
|
|
copy = min_t(int, sizeof(veth), len);
|
|
ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy);
|
|
len -= copy;
|
|
copied += copy;
|
|
if (ret || !len)
|
|
goto done;
|
|
}
|
|
|
|
ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len);
|
|
copied += len;
|
|
|
|
done:
|
|
rcu_read_lock();
|
|
vlan = rcu_dereference(q->vlan);
|
|
if (vlan)
|
|
macvlan_count_rx(vlan, copied - vnet_hdr_len, ret == 0, 0);
|
|
rcu_read_unlock();
|
|
|
|
return ret ? ret : copied;
|
|
}
|
|
|
|
static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
|
|
const struct iovec *iv, unsigned long len,
|
|
int noblock)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
struct sk_buff *skb;
|
|
ssize_t ret = 0;
|
|
|
|
while (len) {
|
|
if (!noblock)
|
|
prepare_to_wait(sk_sleep(&q->sk), &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
|
|
/* Read frames from the queue */
|
|
skb = skb_dequeue(&q->sk.sk_receive_queue);
|
|
if (!skb) {
|
|
if (noblock) {
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
if (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
/* Nothing to read, let's sleep */
|
|
schedule();
|
|
continue;
|
|
}
|
|
ret = macvtap_put_user(q, skb, iv, len);
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
|
|
if (!noblock)
|
|
finish_wait(sk_sleep(&q->sk), &wait);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv,
|
|
unsigned long count, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct macvtap_queue *q = file->private_data;
|
|
ssize_t len, ret = 0;
|
|
|
|
len = iov_length(iv, count);
|
|
if (len < 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = macvtap_do_read(q, iocb, iv, len, file->f_flags & O_NONBLOCK);
|
|
ret = min_t(ssize_t, ret, len); /* XXX copied from tun.c. Why? */
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
|
|
{
|
|
struct macvlan_dev *vlan;
|
|
|
|
ASSERT_RTNL();
|
|
vlan = rtnl_dereference(q->vlan);
|
|
if (vlan)
|
|
dev_hold(vlan->dev);
|
|
|
|
return vlan;
|
|
}
|
|
|
|
static void macvtap_put_vlan(struct macvlan_dev *vlan)
|
|
{
|
|
dev_put(vlan->dev);
|
|
}
|
|
|
|
static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags)
|
|
{
|
|
struct macvtap_queue *q = file->private_data;
|
|
struct macvlan_dev *vlan;
|
|
int ret;
|
|
|
|
vlan = macvtap_get_vlan(q);
|
|
if (!vlan)
|
|
return -EINVAL;
|
|
|
|
if (flags & IFF_ATTACH_QUEUE)
|
|
ret = macvtap_enable_queue(vlan->dev, file, q);
|
|
else if (flags & IFF_DETACH_QUEUE)
|
|
ret = macvtap_disable_queue(q);
|
|
else
|
|
ret = -EINVAL;
|
|
|
|
macvtap_put_vlan(vlan);
|
|
return ret;
|
|
}
|
|
|
|
static int set_offload(struct macvtap_queue *q, unsigned long arg)
|
|
{
|
|
struct macvlan_dev *vlan;
|
|
netdev_features_t features;
|
|
netdev_features_t feature_mask = 0;
|
|
|
|
vlan = rtnl_dereference(q->vlan);
|
|
if (!vlan)
|
|
return -ENOLINK;
|
|
|
|
features = vlan->dev->features;
|
|
|
|
if (arg & TUN_F_CSUM) {
|
|
feature_mask = NETIF_F_HW_CSUM;
|
|
|
|
if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) {
|
|
if (arg & TUN_F_TSO_ECN)
|
|
feature_mask |= NETIF_F_TSO_ECN;
|
|
if (arg & TUN_F_TSO4)
|
|
feature_mask |= NETIF_F_TSO;
|
|
if (arg & TUN_F_TSO6)
|
|
feature_mask |= NETIF_F_TSO6;
|
|
}
|
|
|
|
if (arg & TUN_F_UFO)
|
|
feature_mask |= NETIF_F_UFO;
|
|
}
|
|
|
|
/* tun/tap driver inverts the usage for TSO offloads, where
|
|
* setting the TSO bit means that the userspace wants to
|
|
* accept TSO frames and turning it off means that user space
|
|
* does not support TSO.
|
|
* For macvtap, we have to invert it to mean the same thing.
|
|
* When user space turns off TSO, we turn off GSO/LRO so that
|
|
* user-space will not receive TSO frames.
|
|
*/
|
|
if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO))
|
|
features |= RX_OFFLOADS;
|
|
else
|
|
features &= ~RX_OFFLOADS;
|
|
|
|
/* tap_features are the same as features on tun/tap and
|
|
* reflect user expectations.
|
|
*/
|
|
vlan->tap_features = vlan->dev->features &
|
|
(feature_mask | ~TUN_OFFLOADS);
|
|
vlan->set_features = features;
|
|
netdev_update_features(vlan->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* provide compatibility with generic tun/tap interface
|
|
*/
|
|
static long macvtap_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct macvtap_queue *q = file->private_data;
|
|
struct macvlan_dev *vlan;
|
|
void __user *argp = (void __user *)arg;
|
|
struct ifreq __user *ifr = argp;
|
|
unsigned int __user *up = argp;
|
|
unsigned int u;
|
|
int __user *sp = argp;
|
|
int s;
|
|
int ret;
|
|
|
|
switch (cmd) {
|
|
case TUNSETIFF:
|
|
/* ignore the name, just look at flags */
|
|
if (get_user(u, &ifr->ifr_flags))
|
|
return -EFAULT;
|
|
|
|
ret = 0;
|
|
if ((u & ~(IFF_VNET_HDR | IFF_MULTI_QUEUE)) !=
|
|
(IFF_NO_PI | IFF_TAP))
|
|
ret = -EINVAL;
|
|
else
|
|
q->flags = u;
|
|
|
|
return ret;
|
|
|
|
case TUNGETIFF:
|
|
rtnl_lock();
|
|
vlan = macvtap_get_vlan(q);
|
|
if (!vlan) {
|
|
rtnl_unlock();
|
|
return -ENOLINK;
|
|
}
|
|
|
|
ret = 0;
|
|
if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
|
|
put_user(q->flags, &ifr->ifr_flags))
|
|
ret = -EFAULT;
|
|
macvtap_put_vlan(vlan);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
case TUNSETQUEUE:
|
|
if (get_user(u, &ifr->ifr_flags))
|
|
return -EFAULT;
|
|
rtnl_lock();
|
|
ret = macvtap_ioctl_set_queue(file, u);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
case TUNGETFEATURES:
|
|
if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR |
|
|
IFF_MULTI_QUEUE, up))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case TUNSETSNDBUF:
|
|
if (get_user(u, up))
|
|
return -EFAULT;
|
|
|
|
q->sk.sk_sndbuf = u;
|
|
return 0;
|
|
|
|
case TUNGETVNETHDRSZ:
|
|
s = q->vnet_hdr_sz;
|
|
if (put_user(s, sp))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case TUNSETVNETHDRSZ:
|
|
if (get_user(s, sp))
|
|
return -EFAULT;
|
|
if (s < (int)sizeof(struct virtio_net_hdr))
|
|
return -EINVAL;
|
|
|
|
q->vnet_hdr_sz = s;
|
|
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: only accept frames with the features that
|
|
got enabled for forwarded frames */
|
|
if (!(q->flags & IFF_VNET_HDR))
|
|
return -EINVAL;
|
|
rtnl_lock();
|
|
ret = set_offload(q, arg);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
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_sendmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t total_len)
|
|
{
|
|
struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
|
|
return macvtap_get_user(q, m, m->msg_iov, total_len, m->msg_iovlen,
|
|
m->msg_flags & MSG_DONTWAIT);
|
|
}
|
|
|
|
static int macvtap_recvmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t total_len,
|
|
int flags)
|
|
{
|
|
struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
|
|
int ret;
|
|
if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
|
|
return -EINVAL;
|
|
ret = macvtap_do_read(q, iocb, m->msg_iov, total_len,
|
|
flags & MSG_DONTWAIT);
|
|
if (ret > total_len) {
|
|
m->msg_flags |= MSG_TRUNC;
|
|
ret = flags & MSG_TRUNC ? ret : total_len;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Ops structure to mimic raw sockets with tun */
|
|
static const struct proto_ops macvtap_socket_ops = {
|
|
.sendmsg = macvtap_sendmsg,
|
|
.recvmsg = macvtap_recvmsg,
|
|
};
|
|
|
|
/* Get an underlying socket object from tun file. Returns error unless file is
|
|
* attached to a device. The returned object works like a packet socket, it
|
|
* can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for
|
|
* holding a reference to the file for as long as the socket is in use. */
|
|
struct socket *macvtap_get_socket(struct file *file)
|
|
{
|
|
struct macvtap_queue *q;
|
|
if (file->f_op != &macvtap_fops)
|
|
return ERR_PTR(-EINVAL);
|
|
q = file->private_data;
|
|
if (!q)
|
|
return ERR_PTR(-EBADFD);
|
|
return &q->sock;
|
|
}
|
|
EXPORT_SYMBOL_GPL(macvtap_get_socket);
|
|
|
|
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;
|
|
|
|
if (dev->rtnl_link_ops != &macvtap_link_ops)
|
|
return NOTIFY_DONE;
|
|
|
|
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%d", dev->ifindex);
|
|
if (IS_ERR(classdev)) {
|
|
macvtap_free_minor(vlan);
|
|
return notifier_from_errno(PTR_ERR(classdev));
|
|
}
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
|
|
device_destroy(macvtap_class, devt);
|
|
macvtap_free_minor(vlan);
|
|
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;
|
|
|
|
macvtap_class = class_create(THIS_MODULE, "macvtap");
|
|
if (IS_ERR(macvtap_class)) {
|
|
err = PTR_ERR(macvtap_class);
|
|
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);
|
|
}
|
|
module_exit(macvtap_exit);
|
|
|
|
MODULE_ALIAS_RTNL_LINK("macvtap");
|
|
MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
|
|
MODULE_LICENSE("GPL");
|