[PATCH bpf-next] bpf: allow CGROUP_SKB programs to use bpf_get_current_cgroup_id() helper

[Roman Gushchin <guro@xxxxxx>]

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@xxxxxx>
Cc: Yonghong Song <yhs@xxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
---
 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