ipv6: don't reject link-local nexthop on other interface
48ed7b26 ("ipv6: reject locally assigned nexthop addresses") is too strict; it rejects following corner-case: ip -6 route add default via fe80::1:2:3 dev eth1 [ where fe80::1:2:3 is assigned to a local interface, but not eth1 ] Fix this by restricting search to given device if nh is linklocal. Joint work with Hannes Frederic Sowa. Fixes: 48ed7b26 ("ipv6: reject locally assigned nexthop addresses") Signed-off-by: NHannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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