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The length of AH header is computed manually as (hp->hdrlen+2)<<2. However, in include/linux/ipv6.h, a macro named ipv6_authlen is already defined for exactly the same job. This commit replaces the manual computation code with the macro. Signed-off-by: yangxingwu <xingwu.yang@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>