ip6_gre: Refactor ip6gre xmit codes
This patch refactors the ip6gre_xmit_{ipv4, ipv6}. It is a prep work to add the ip6erspan tunnel. Signed-off-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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