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Add a small skb_mac_header_len() helper similarly as the skb_network_header_len() we have and replace open coded places in BPF's bpf_skb_change_proto() helper. Will also be used in upcoming work. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>