ipv6: move IPV6_TCLASS_SHIFT into ipv6.h and define a helper
Two places defined IPV6_TCLASS_SHIFT, so we should move it into ipv6.h, and use this macro as possible. And define ip6_tclass helper to return tclass Signed-off-by: Li RongQing <roy.qing.li@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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