bpf: Sync bpf.h to tools/

Sync skb_ancestor_cgroup_id() related bpf UAPI changes to tools/.

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 3102a2a23c318d9803c09ea7464fdc5f6b1cf3f3..66917a4eba2716ebdef75a78e854f4e9874c88b9 100644 (file)
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2093,6 +2093,24 @@ union bpf_attr {
  *     Return
  *             The id is returned or 0 in case the id could not be retrieved.
  *
+ * u64 bpf_skb_ancestor_cgroup_id(struct sk_buff *skb, int ancestor_level)
+ *     Description
+ *             Return id of cgroup v2 that is ancestor of cgroup associated
+ *             with the *skb* at the *ancestor_level*.  The root cgroup is at
+ *             *ancestor_level* zero and each step down the hierarchy
+ *             increments the level. If *ancestor_level* == level of cgroup
+ *             associated with *skb*, then return value will be same as that
+ *             of **bpf_skb_cgroup_id**\ ().
+ *
+ *             The helper is useful to implement policies based on cgroups
+ *             that are upper in hierarchy than immediate cgroup associated
+ *             with *skb*.
+ *
+ *             The format of returned id and helper limitations are same as in
+ *             **bpf_skb_cgroup_id**\ ().
+ *     Return
+ *             The id is returned or 0 in case the id could not be retrieved.
+ *
  * u64 bpf_get_current_cgroup_id(void)
  *     Return
  *             A 64-bit integer containing the current cgroup id based
@@ -2207,7 +2225,8 @@ union bpf_attr {
        FN(skb_cgroup_id),              \
        FN(get_current_cgroup_id),      \
        FN(get_local_storage),          \
-       FN(sk_select_reuseport),
+       FN(sk_select_reuseport),        \
+       FN(skb_ancestor_cgroup_id),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call