On Mon, Jun 5, 2023 at 6:15 AM Florian Westphal <fw@xxxxxxxxx> wrote:
>
> Andrii Nakryiko writes:
>
> And we currently don't have an attach type for NETLINK BPF link.
> Thankfully it's not too late to add it. I see that link_create() in
> kernel/bpf/syscall.c just bypasses attach_type check. We shouldn't
> have done that. Instead we need to add BPF_NETLINK attach type to enum
> bpf_attach_type. And wire all that properly throughout the kernel and
> libbpf itself.
>
> This adds BPF_NETFILTER and uses it. This breaks uabi but this
> wasn't in any non-rc release yet, so it should be fine.
>
> v2: check link_attack prog type in link_create too
>
> Fixes: 84601d6ee68a ("bpf: add bpf_link support for BPF_NETFILTER programs")
> Suggested-by: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
> Link: https://lore.kernel.org/bpf/CAEf4BzZ69YgrQW7DHCJUT_X+GqMq_ZQQPBwopaJJVGFD5=d5Vg@xxxxxxxxxxxxxx/
> Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
> ---
There was one more place that needed adjustment in
tools/lib/bpf/libbpf_probes.c and another in tools/lib/bpf/libbpf.c
for BPF_NETLINK -> "netlink" string representation. I fixed it up and
pushed it to the bpf tree, but for future submissions please make sure
to run all selftests locally and make sure they all pass.
> include/uapi/linux/bpf.h | 1 +
> kernel/bpf/syscall.c | 9 +++++++++
> tools/include/uapi/linux/bpf.h | 1 +
> tools/lib/bpf/libbpf.c | 2 +-
> 4 files changed, 12 insertions(+), 1 deletion(-)
>
[...]
