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[net-next,3/3] bpf: allow bpf_get_prandom_u32() to be used in tracing

Message ID 1470964638-1313057-4-git-send-email-ast@fb.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Alexei Starovoitov Aug. 12, 2016, 1:17 a.m. UTC 
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>
---
 kernel/trace/bpf_trace.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index b20438fdb029..96a3e3bbbe9e 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -407,6 +407,8 @@  static const struct bpf_func_proto *tracing_func_proto(enum bpf_func_id func_id)
 		return &bpf_perf_event_read_proto;
 	case BPF_FUNC_probe_write_user:
 		return bpf_get_probe_write_proto();
+	case BPF_FUNC_get_prandom_u32:
+		return &bpf_get_prandom_u32_proto;
 	default:
 		return NULL;
 	}