bpf: fix bpf_skb_in_cgroup helper naming

While hashing out BPF's current_task_under_cgroup helper bits, it came
to discussion that the skb_in_cgroup helper name was suboptimally chosen.

Tejun says:

  So, I think in_cgroup should mean that the object is in that
  particular cgroup while under_cgroup in the subhierarchy of that
  cgroup. Let's rename the other subhierarchy test to under too. I
  think that'd be a lot less confusing going forward.

  [...]

  It's more intuitive and gives us the room to implement the real
  "in" test if ever necessary in the future.

Since this touches uapi bits, we need to change this as long as v4.8
is not yet officially released. Thus, change the helper enum and rename
related bits.

Fixes: 4a482f34afcc ("cgroup: bpf: Add bpf_skb_in_cgroup_proto")
Reference: http://patchwork.ozlabs.org/patch/658500/
Suggested-by: Sargun Dhillon <sargun@sargun.me>
Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 7094c69ac199..daea765d72e6 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1053,7 +1053,7 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id)
                         goto error;
                 break;
         case BPF_MAP_TYPE_CGROUP_ARRAY:
-                if (func_id != BPF_FUNC_skb_in_cgroup)
+                if (func_id != BPF_FUNC_skb_under_cgroup)
                         goto error;
                 break;
         default:
@@ -1075,7 +1075,7 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id)
                 if (map->map_type != BPF_MAP_TYPE_STACK_TRACE)
                         goto error;
                 break;
-        case BPF_FUNC_skb_in_cgroup:
+        case BPF_FUNC_skb_under_cgroup:
                 if (map->map_type != BPF_MAP_TYPE_CGROUP_ARRAY)
                         goto error;
                 break;