net: openvswitch: fix uAPI incompatibility with existing user space

Few years ago OVS user space made a strange choice in the commit [1]
to define types only valid for the user space inside the copy of a
kernel uAPI header.  '#ifndef __KERNEL__' and another attribute was
added later.

This leads to the inevitable clash between user space and kernel types
when the kernel uAPI is extended.  The issue was unveiled with the
addition of a new type for IPv6 extension header in kernel uAPI.

When kernel provides the OVS_KEY_ATTR_IPV6_EXTHDRS attribute to the
older user space application, application tries to parse it as
OVS_KEY_ATTR_PACKET_TYPE and discards the whole netlink message as
malformed.  Since OVS_KEY_ATTR_IPV6_EXTHDRS is supplied along with
every IPv6 packet that goes to the user space, IPv6 support is fully
broken.

Fixing that by bringing these user space attributes to the kernel
uAPI to avoid the clash.  Strictly speaking this is not the problem
of the kernel uAPI, but changing it is the only way to avoid breakage
of the older user space applications at this point.

These 2 types are explicitly rejected now since they should not be
passed to the kernel.  Additionally, OVS_KEY_ATTR_TUNNEL_INFO moved
out from the '#ifdef __KERNEL__' as there is no good reason to hide
it from the userspace.  And it's also explicitly rejected now, because
it's for in-kernel use only.

Comments with warnings were added to avoid the problem coming back.

(1 << type) converted to (1ULL << type) to avoid integer overflow on
OVS_KEY_ATTR_IPV6_EXTHDRS, since it equals 32 now.

 [1] beb75a40fdc2 ("userspace: Switching of L3 packets in L2 pipeline")

Fixes: 28a3f060 ("net: openvswitch: IPv6: Add IPv6 extension header support")
Link: https://lore.kernel.org/netdev/3adf00c7-fe65-3ef4-b6d7-6d8a0cad8a5f@nvidia.com
Link: https://github.com/openvswitch/ovs/commit/beb75a40fdc295bfd6521b0068b4cd12f6de507c


Reported-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Aaron Conole <aconole@redhat.com>
Link: https://lore.kernel.org/r/20220309222033.3018976-1-i.maximets@ovn.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>