udp: check udp sock encap_type in __udp_lib_err
There is a chance that __udp4/6_lib_lookup() returns a udp encap sock in __udp_lib_err(), like the udp encap listening sock may use the same port as remote encap port, in which case it should go to __udp4/6_lib_err_encap() for more validation before processing the icmp packet. This patch is to check encap_type in __udp_lib_err() for the further validation for a encap sock. Signed-off-by: NXin Long <lucien.xin@gmail.com> Acked-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: NJakub Kicinski <kuba@kernel.org>
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