bpf: introduce BPF_PROG_QUERY command

introduce BPF_PROG_QUERY command to retrieve a set of either
attached programs to given cgroup or a set of effective programs
that will execute for events within a cgroup

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
for cgroup bits
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 762f74bc6c47..cb2b9f95160a 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -92,6 +92,7 @@ enum bpf_cmd {
         BPF_PROG_GET_FD_BY_ID,
         BPF_MAP_GET_FD_BY_ID,
         BPF_OBJ_GET_INFO_BY_FD,
+        BPF_PROG_QUERY,
 };
 
 enum bpf_map_type {
@@ -211,6 +212,9 @@ enum bpf_attach_type {
 /* Specify numa node during map creation */
 #define BPF_F_NUMA_NODE         (1U << 2)
 
+/* flags for BPF_PROG_QUERY */
+#define BPF_F_QUERY_EFFECTIVE   (1U << 0)
+
 #define BPF_OBJ_NAME_LEN 16U
 
 union bpf_attr {
@@ -289,6 +293,15 @@ union bpf_attr {
                 __u32           info_len;
                 __aligned_u64   info;
         } info;
+
+        struct { /* anonymous struct used by BPF_PROG_QUERY command */
+                __u32           target_fd;      /* container object to query */
+                __u32           attach_type;
+                __u32           query_flags;
+                __u32           attach_flags;
+                __aligned_u64   prog_ids;
+                __u32           prog_cnt;
+        } query;
 } __attribute__((aligned(8)));
 
 /* BPF helper function descriptions: