e0c694c73d
BPF firewall is supported starting from v4.9 kernel where BPF_PROG_TYPE_SOCKET_FILTER support was added [0]. However, program name support was added to v4.15 [1] and BPF_PROG_LOAD syscall will fail on older kernels if called with prog_name attribute. BPF_F_ALLOW_MULTI was also added to v4.15 kernel which allows reusing BPF_F_ALLOW_MULTI probe to indicate that program name is also supported. It is no problem for BPF_PROG_TYPE_CGROUP_DEVICE since it was added in v4.15. [0] https://elixir.bootlin.com/linux/v4.9/source/include/uapi/linux/bpf.h#L92 [1] https://elixir.bootlin.com/linux/v4.15/source/include/uapi/linux/bpf.h#L191 Follow-up of https://github.com/systemd/systemd/pull/22214
System and Service Manager
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