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rfc 4861 says the Redirected Header option is optional, so the kernel should not drop the Redirect Message that has no Redirected Header option. In this patch, the function ip6_redirect_no_header() is introduced to deal with that condition. Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>