Merge "Add a test BPF program with a ring buffer."

3 files changed, 56 insertions, 0 deletions

diff --git a/bpfloader/Android.bp b/bpfloader/Android.bp
index 42cb50c..d3428b0 100644
--- a/bpfloader/Android.bp
+++ b/bpfloader/Android.bp
@@ -59,4 +59,11 @@ cc_binary {
         "timeInState.o"
     ],
 
+    product_variables: {
+        debuggable: {
+            required: [
+                "bpfRingbufProg.o",
+            ],
+        },
+    }
 }
diff --git a/progs/Android.bp b/progs/Android.bp
index aeb04a7..b044eb0 100644
--- a/progs/Android.bp
+++ b/progs/Android.bp
@@ -26,3 +26,12 @@ cc_library_headers {
     name: "bpf_prog_headers",
     export_include_dirs: ["include"],
 }
+
+bpf {
+    name: "bpfRingbufProg.o",
+    srcs: ["bpfRingbufProg.c"],
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+}
diff --git a/progs/bpfRingbufProg.c b/progs/bpfRingbufProg.c
new file mode 100644
index 0000000..99b8345
--- /dev/null
+++ b/progs/bpfRingbufProg.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "bpf_helpers.h"
+
+// This can't be easily changed since the program is loaded on boot and may be
+// run against tests at a slightly different version.
+#define TEST_RINGBUF_MAGIC_NUM 12345
+
+// This ring buffer is for testing purposes only.
+DEFINE_BPF_RINGBUF_EXT(test_ringbuf, __u64, 4096, AID_ROOT, AID_ROOT, 0660, "", "", false);
+
+// This program is for test purposes only - it should never be attached to a
+// socket, only executed manually with BPF_PROG_RUN.
+DEFINE_BPF_PROG_KVER("skfilter/ringbuf_test", AID_ROOT, AID_ROOT, test_ringbuf_prog, KVER(5, 8, 0))
+(void* unused_ctx) {
+    __u64* output = bpf_test_ringbuf_reserve();
+    if (output == NULL) return 1;
+
+    (*output) = TEST_RINGBUF_MAGIC_NUM;
+    bpf_test_ringbuf_submit(output);
+
+    return 0;
+}
+
+LICENSE("Apache 2.0");
+CRITICAL("BPF Ringbuf test");