net: ip6_gre: Split up ip6gre_tnl_change()
Split a reusable function ip6gre_tnl_copy_tnl_parm() from ip6gre_tnl_change(). This will allow ERSPAN-specific code to reuse the common parts while customizing the behavior for ERSPAN. Fixes: 5a963eb6 ("ip6_gre: Add ERSPAN native tunnel support") Signed-off-by: NPetr Machata <petrm@mellanox.com> Acked-by: NWilliam Tu <u9012063@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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