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Sometimes, we need probe and set the transport header for packets (e.g from untrusted source). This patch introduces a new helper skb_probe_transport_header() which tries to probe and set the l4 header through skb_flow_dissect(), if not just set the transport header to the hint passed by caller. Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>