bpf, sk_msg: Add some generic helpers that may be useful from sk_msg

Add these generic helpers that may be useful to use from sk_msg programs.
The helpers do not depend on ctx so we can simply add them here,

 BPF_FUNC_perf_event_output
 BPF_FUNC_get_current_uid_gid
 BPF_FUNC_get_current_pid_tgid
 BPF_FUNC_get_current_cgroup_id
 BPF_FUNC_get_current_ancestor_cgroup_id
 BPF_FUNC_get_cgroup_classid

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/159033903373.12355.15489763099696629346.stgit@john-Precision-5820-Tower
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/net/core/filter.c b/net/core/filter.c
index bd2853d..c3b496a 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6443,6 +6443,22 @@ sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
                return &bpf_msg_push_data_proto;
        case BPF_FUNC_msg_pop_data:
                return &bpf_msg_pop_data_proto;
+       case BPF_FUNC_perf_event_output:
+               return &bpf_event_output_data_proto;
+       case BPF_FUNC_get_current_uid_gid:
+               return &bpf_get_current_uid_gid_proto;
+       case BPF_FUNC_get_current_pid_tgid:
+               return &bpf_get_current_pid_tgid_proto;
+#ifdef CONFIG_CGROUPS
+       case BPF_FUNC_get_current_cgroup_id:
+               return &bpf_get_current_cgroup_id_proto;
+       case BPF_FUNC_get_current_ancestor_cgroup_id:
+               return &bpf_get_current_ancestor_cgroup_id_proto;
+#endif
+#ifdef CONFIG_CGROUP_NET_CLASSID
+       case BPF_FUNC_get_cgroup_classid:
+               return &bpf_get_cgroup_classid_curr_proto;
+#endif
        default:
                return bpf_base_func_proto(func_id);
        }