Merge branch 'VSOCK-sock_diag'

Stefan Hajnoczi says:

====================
VSOCK: add sock_diag interface

v3:
 * Rebased onto net-next/master and resolved Hyper-V transport conflict

v2:
 * Moved tests to tools/testing/vsock/.  I was unable to put them in selftests/
   because they require manual setup of a VMware/KVM guest.
 * Moved to __vsock_in_bound/connected_table() to af_vsock.h
 * Fixed local variable ordering in Patch 4

There is currently no way for userspace to query open AF_VSOCK sockets.  This
means ss(8), netstat(8), and other utilities cannot display AF_VSOCK sockets.

This patch series adds the netlink sock_diag interface for AF_VSOCK.  Userspace
programs sent a DUMP request including an sk_state bitmap to filter sockets
based on their state (connected, listening, etc).  The vsock_diag.ko module
replies with information about matching sockets.  This userspace ABI is defined
in <linux/vm_sockets_diag.h>.

The final patch adds a test suite that exercises the basic cases.

Jorgen and Dexuan: I have only tested the virtio transport but this should also
work for VMCI and Hyper-V.  Please give it a shot if you have time.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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