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virtio/vsock: enable SEQPACKET for transport 

To make transport work with SOCK_SEQPACKET add two things:
1) SOCK_SEQPACKET ops for virtio transport and 'seqpacket_allow()'
   callback.
2) Handling of SEQPACKET bit: guest tries to negotiate it with vhost,
   so feature will be enabled only if bit is negotiated with device.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arseny Krasnov 2021-06-11 14:13:22 +03:00 committed by David S. Miller
parent 9ac841f5e9
commit 53efbba12c
1 changed files with 26 additions and 0 deletions
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26
net/vmw_vsock/virtio_transport.c
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@ -62,6 +62,7 @@ struct virtio_vsock {
struct virtio_vsock_event event_list[8];
u32 guest_cid;
bool seqpacket_allow;
};
static u32 virtio_transport_get_local_cid(void)
@ -443,6 +444,8 @@ static void virtio_vsock_rx_done(struct virtqueue *vq)
queue_work(virtio_vsock_workqueue, &vsock->rx_work);
}
static bool virtio_transport_seqpacket_allow(u32 remote_cid);
static struct virtio_transport virtio_transport = {
.transport = {
.module = THIS_MODULE,
@ -469,6 +472,11 @@ static struct virtio_transport virtio_transport = {
.stream_is_active = virtio_transport_stream_is_active,
.stream_allow = virtio_transport_stream_allow,
.seqpacket_dequeue = virtio_transport_seqpacket_dequeue,
.seqpacket_enqueue = virtio_transport_seqpacket_enqueue,
.seqpacket_allow = virtio_transport_seqpacket_allow,
.seqpacket_has_data = virtio_transport_seqpacket_has_data,
.notify_poll_in = virtio_transport_notify_poll_in,
.notify_poll_out = virtio_transport_notify_poll_out,
.notify_recv_init = virtio_transport_notify_recv_init,
@ -485,6 +493,19 @@ static struct virtio_transport virtio_transport = {
.send_pkt = virtio_transport_send_pkt,
};
static bool virtio_transport_seqpacket_allow(u32 remote_cid)
{
struct virtio_vsock *vsock;
bool seqpacket_allow;
rcu_read_lock();
vsock = rcu_dereference(the_virtio_vsock);
seqpacket_allow = vsock->seqpacket_allow;
rcu_read_unlock();
return seqpacket_allow;
}
static void virtio_transport_rx_work(struct work_struct *work)
{
struct virtio_vsock *vsock =
@ -608,10 +629,14 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
vsock->event_run = true;
mutex_unlock(&vsock->event_lock);
if (virtio_has_feature(vdev, VIRTIO_VSOCK_F_SEQPACKET))
vsock->seqpacket_allow = true;
vdev->priv = vsock;
rcu_assign_pointer(the_virtio_vsock, vsock);
mutex_unlock(&the_virtio_vsock_mutex);
return 0;
out:
@ -695,6 +720,7 @@ static struct virtio_device_id id_table[] = {
};
static unsigned int features[] = {
VIRTIO_VSOCK_F_SEQPACKET
};
static struct virtio_driver virtio_vsock_driver = {