Merge branch 'net-ipv6-Add-support-for-ONLINK-flag'

David Ahern says:

====================
net/ipv6: Add support for ONLINK flag

Add support for RTNH_F_ONLINK with ipv6 routes.

First patch moves existing gateway validation into helper. The onlink
flag requires a different set of checks and the existing validation
makes ip6_route_info_create long enough.

Second patch makes the table id and lookup flag an option to
ip6_nh_lookup_table. onlink check needs to verify the gateway without
the RT6_LOOKUP_F_IFACE flag and PBR with VRF means the table id can
vary between the table the route is inserted and the VRF the egress
device is enslaved to.

Third patch adds support for RTNH_F_ONLINK.

I have a set of test cases in a format based on the framework Ido and
Jiri are working on. Once that goes in I will adapt the script and
submit.

v2
- removed table id check. Too constraining for PBR with VRF use cases
====================

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

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