bpf: add bpf_xdp_adjust_tail sample prog
adding bpf's sample program which is using bpf_xdp_adjust_tail helper by generating ICMPv4 "packet to big" message if ingress packet's size is bigger then 600 bytes Signed-off-by: NNikita V. Shirokov <tehnerd@tehnerd.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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