[NETD-BPF#19] Mainline part of bpf code from netd
1. Add libnetd_updatable.so in com.android.tethering. The library is
loaded by netd. Currently, it mainly targets on a few functions which
access BPF maps. The functionality may extend in the future.
2. Attach gcroup progs from libnetd_updatable.so.
3. Move (privileged)TagSocket and untagSocket implementation to mainline
module. Combine privilegedTagSocket and untagSocket into a single
function.
4. Split related unit tests from netd_unit_test to
libnetd_updatable_unit_test as well.
Bug: 202086915
Test: cd system/netd; atest
Test: atest TrafficStatsTest NetworkUsageStatsTest
Change-Id: Ib556458103a4cbb643c1342d9b689ac692160de0
diff --git a/netd/NetdUpdatable.cpp b/netd/NetdUpdatable.cpp
new file mode 100644
index 0000000..f0997fc
--- /dev/null
+++ b/netd/NetdUpdatable.cpp
@@ -0,0 +1,61 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "NetdUpdatable"
+
+#include "NetdUpdatable.h"
+
+#include <android-base/logging.h>
+#include <netdutils/Status.h>
+
+#include "NetdUpdatablePublic.h"
+
+int libnetd_updatable_init(const char* cg2_path) {
+ android::base::InitLogging(/*argv=*/nullptr);
+ LOG(INFO) << __func__ << ": Initializing";
+
+ android::net::gNetdUpdatable = android::net::NetdUpdatable::getInstance();
+ android::netdutils::Status ret = android::net::gNetdUpdatable->mBpfHandler.init(cg2_path);
+ if (!android::netdutils::isOk(ret)) {
+ LOG(ERROR) << __func__ << ": BPF handler init failed";
+ return -ret.code();
+ }
+ return 0;
+}
+
+int libnetd_updatable_tagSocket(int sockFd, uint32_t tag, uid_t chargeUid, uid_t realUid) {
+ if (android::net::gNetdUpdatable == nullptr) return -EPERM;
+ return android::net::gNetdUpdatable->mBpfHandler.tagSocket(sockFd, tag, chargeUid, realUid);
+}
+
+int libnetd_updatable_untagSocket(int sockFd) {
+ if (android::net::gNetdUpdatable == nullptr) return -EPERM;
+ return android::net::gNetdUpdatable->mBpfHandler.untagSocket(sockFd);
+}
+
+namespace android {
+namespace net {
+
+NetdUpdatable* gNetdUpdatable = nullptr;
+
+NetdUpdatable* NetdUpdatable::getInstance() {
+ // Instantiated on first use.
+ static NetdUpdatable instance;
+ return &instance;
+}
+
+} // namespace net
+} // namespace android