bpf: allow bpf_get_prandom_u32() to be used in tracing

bpf_get_prandom_u32() was initially introduced for socket filters
and later requested numberous times to be added to tracing bpf programs
for the same reason as in socket filters: to be able to randomly
select incoming events.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 6b794d6..ad35213 100644 (file)
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -437,6 +437,8 @@ static const struct bpf_func_proto *tracing_func_proto(enum bpf_func_id func_id)
                return bpf_get_probe_write_proto();
        case BPF_FUNC_current_task_under_cgroup:
                return &bpf_current_task_under_cgroup_proto;
+       case BPF_FUNC_get_prandom_u32:
+               return &bpf_get_prandom_u32_proto;
        default:
                return NULL;
        }