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