netfilter: xt_bpf: support ebpf
Add support for attaching an eBPF object by file descriptor. The iptables binary can be called with a path to an elf object or a pinned bpf object. Also pass the mode and path to the kernel to be able to return it later for iptables dump and save. Signed-off-by: NWillem de Bruijn <willemb@google.com> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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