test various corner cases of the helper function access to the packet
via crafted XDP programs.
Signed-off-by: NAaron Yue <haoxuany@fb.com>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>