Messages in this thread Patch in this message | | | From | Roman Gushchin <> | Subject | [PATCH bpf-next] bpf: allow CGROUP_SKB programs to use bpf_get_current_cgroup_id() helper | Date | Thu, 6 Jun 2019 11:59:11 -0700 |
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Currently bpf_get_current_cgroup_id() is not supported for CGROUP_SKB programs. An attempt to load such a program generates an error like this: libbpf: 0: (b7) r6 = 0 ... 8: (63) *(u32 *)(r10 -28) = r6 9: (85) call bpf_get_current_cgroup_id#80 unknown func bpf_get_current_cgroup_id#80
There are no particular reasons for denying it, and we have some use cases where it might be useful.
So let's add it to the list of allowed helpers.
Signed-off-by: Roman Gushchin <guro@fb.com> Cc: Yonghong Song <yhs@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> --- net/core/filter.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c index 55bfc941d17a..19724bb1860d 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5919,6 +5919,10 @@ cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sk_storage_get_proto; case BPF_FUNC_sk_storage_delete: return &bpf_sk_storage_delete_proto; +#ifdef CONFIG_CGROUPS + case BPF_FUNC_get_current_cgroup_id: + return &bpf_get_current_cgroup_id_proto; +#endif #ifdef CONFIG_INET case BPF_FUNC_tcp_sock: return &bpf_tcp_sock_proto; -- 2.20.1
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