Install BPF filter to only capture ARP replies on macOS#27
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krjakbrjak merged 1 commit intomainfrom Feb 19, 2026
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* Previously the BPF device received all packets on the interface and discarded non-ARP traffic in userspace. Install a kernel-level BPF filter (BIOCSETF) that only passes ARP reply frames (EtherType 0x0806, opcode 2), avoiding unnecessary copies on busy networks. * Uses golang.org/x/net/bpf for typed filter instructions and its VM for testing. Signed-off-by: Nikita Vakula <programmistov.programmist@gmail.com>
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Previously the BPF device received all packets on the interface and discarded non-ARP traffic in userspace. Install a kernel-level BPF filter (BIOCSETF) that only passes ARP reply frames (EtherType 0x0806, opcode 2), avoiding unnecessary copies on busy networks.
Uses golang.org/x/net/bpf for typed filter instructions and its VM for testing.