Move the netlink command code to a new NetlinkCommands file.

Test: bullhead builds, netd boots
Test: netd_{unit,integration}_test pass
Bug: 34873832
Change-Id: Ia6fcde63e1092a62cad1c5238bbb9a91a9f39080

1 files changed, 62 insertions, 0 deletions

diff --git a/server/NetlinkCommands.h b/server/NetlinkCommands.h
new file mode 100644
index 00000000..0b109e1c
--- /dev/null
+++ b/server/NetlinkCommands.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#ifndef NETD_SERVER_NETLINK_UTIL_H
+#define NETD_SERVER_NETLINK_UTIL_H
+
+#include <functional>
+
+#include "NetdConstants.h"
+
+namespace android {
+namespace net {
+
+const sockaddr_nl KERNEL_NLADDR = {AF_NETLINK, 0, 0, 0};
+
+// Generic code for processing netlink dumps.
+const int kNetlinkDumpBufferSize = 8192;
+typedef std::function<void(nlmsghdr *)> NetlinkDumpCallback;
+
+// Opens an RTNetlink socket and connects it to the kernel.
+WARN_UNUSED_RESULT int openRtNetlinkSocket();
+
+// Receives a netlink ACK. Returns 0 if the command succeeded or negative errno if the command
+// failed or receiving the ACK failed.
+WARN_UNUSED_RESULT int recvNetlinkAck(int sock);
+
+// Sends a netlink request and possibly expects an ACK. The first element of iov should be null and
+// will be set to the netlink message headerheader. The subsequent elements are the contents of the
+// request.
+WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen);
+
+// Disable optimizations in ASan build.
+// ASan reports an out-of-bounds 32-bit(!) access in the first loop of the
+// function (over iov[]).
+#ifdef __clang__
+#if __has_feature(address_sanitizer)
+__attribute__((optnone))
+#endif
+#endif
+WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen,
+                                          const NetlinkDumpCallback& callback);
+
+// Processes a netlink dump, passing every message to the specified |callback|.
+WARN_UNUSED_RESULT int processNetlinkDump(int sock, const NetlinkDumpCallback& callback);
+
+}  // namespace net
+}  // namespace android
+
+#endif  // NETD_SERVER_NETLINK_UTIL_H