flow_dissector: implements flow dissector BPF hook
Adds a hook for programs of type BPF_PROG_TYPE_FLOW_DISSECTOR and attach type BPF_FLOW_DISSECTOR that is executed in the flow dissector path. The BPF program is per-network namespace. Signed-off-by:Petar Penkov <ppenkov@google.com> Signed-off-by:
Willem de Bruijn <willemb@google.com> Signed-off-by:
Alexei Starovoitov <ast@kernel.org>
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