net: ip6_gre: Split up ip6gre_changelink()
Extract from ip6gre_changelink() a reusable function ip6gre_changelink_common(). This will allow introduction of ERSPAN-specific _changelink() function with not a lot of code duplication. Fixes: 5a963eb6 ("ip6_gre: Add ERSPAN native tunnel support") Signed-off-by: Petr Machata <petrm@mellanox.com> Acked-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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