vxlan: support both IPv4 and IPv6 sockets

Note: this needs net merged into net-next in order to apply.

It's currently not easy enough to work with metadata based vxlan tunnels. In particular, it's necessary to create separate network interfaces for IPv4 and IPv6 tunneling. Assigning an IPv6 address to an IPv4 interface is allowed yet won't do what's expected. With route based tunneling, one has to pay attention to use the vxlan interface opened with the correct family. Other users of this (openvswitch) would need to always create two vxlan interfaces.

Furthermore, there's no sane API for creating an IPv6 vxlan metadata based interface.

This patchset simplifies this by opening both IPv4 and IPv6 socket if the vxlan interface has the metadata flag (IFLA_VXLAN_COLLECT_METADATA) set. Assignment of addresses etc. works as expected after this.

Jiri Benc (2):
vxlan: make vxlan_sock_add and vxlan_sock_release complementary
vxlan: support both IPv4 and IPv6 sockets in a single vxlan device

 drivers/net/vxlan.c           | 167 +++++++++++++++++++++++++++---------------
 include/net/vxlan.h           |  14 +++-
 net/openvswitch/vport-vxlan.c |   3 +-
 3 files changed, 121 insertions(+), 63 deletions(-)

1.8.3.1