shill: Add RTNLMessage: rtnl message parser/composer

Add RTNLMessage type.  This will be used to remove some bespoke
messaging parsing, but more immediately, it will be used by the
routing code.

BUG=chromium-os:17277
TEST=New unittest

Change-Id: Idb0559b907f018e021193c51d30f5027c8debec3
Reviewed-on: http://gerrit.chromium.org/gerrit/4183
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/rtnl_message_unittest.cc b/rtnl_message_unittest.cc
new file mode 100644
index 0000000..4ba5876
--- /dev/null
+++ b/rtnl_message_unittest.cc
@@ -0,0 +1,604 @@
+// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <gtest/gtest.h>
+
+#include "shill/byte_string.h"
+#include "shill/ip_address.h"
+#include "shill/rtnl_message.h"
+
+using testing::Test;
+
+namespace shill {
+
+namespace {
+
+// These test strings were generated by cutting up the output of the
+// "rtmon" utility into individual strings.  This tool outputs the raw
+// RTNL packet contents sent by the kernel.  The comments above each
+// of these strings is the markup that the "ip monitor" command
+// outputs for each of these RTNL packets.
+
+
+// 2: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
+//     link/ether c0:f8:da:05:03:0b brd ff:ff:ff:ff:ff:ff
+
+const int kNewLinkMessageWlan0InterfaceIndex = 2;
+const unsigned int kNewLinkMessageWlan0InterfaceFlags =
+    IFF_BROADCAST | IFF_MULTICAST | IFF_UP | IFF_LOWER_UP | IFF_RUNNING;
+const unsigned int kNewLinkMessageWlan0InterfaceFlagsChange = 0;
+const uint32 kNewLinkMessageWlan0MTU = 1500;
+const char kNewLinkMessageWlan0MACAddress[] = "\xc0\xf8\xda\x05\x03\x0b";
+const char kNewLinkMessageWlan0InterfaceName[] = "wlan0";
+const char kNewLinkMessageWlan0Qdisc[] = "mq";
+const int kNewLinkMessageWlan0OperState = IF_OPER_UP;
+
+const unsigned char kNewLinkMessageWlan0[] = {
+  0xe0, 0x03, 0x00, 0x00, 0x10, 0x00, 0x02, 0x00,
+  0x53, 0x18, 0x1f, 0x4e, 0xac, 0x77, 0x00, 0x00,
+  0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00, 0x00,
+  0x43, 0x10, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x0a, 0x00, 0x03, 0x00, 0x77, 0x6c, 0x61, 0x6e,
+  0x30, 0x00, 0x00, 0x00, 0x08, 0x00, 0x0d, 0x00,
+  0xe8, 0x03, 0x00, 0x00, 0x05, 0x00, 0x10, 0x00,
+  0x06, 0x00, 0x00, 0x00, 0x05, 0x00, 0x11, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x08, 0x00, 0x04, 0x00,
+  0xdc, 0x05, 0x00, 0x00, 0x07, 0x00, 0x06, 0x00,
+  0x6d, 0x71, 0x00, 0x00, 0x20, 0x00, 0x0e, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x01, 0x00,
+  0xc0, 0xf8, 0xda, 0x05, 0x03, 0x0b, 0x00, 0x00,
+  0x0a, 0x00, 0x02, 0x00, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0x00, 0x00, 0x60, 0x00, 0x07, 0x00,
+  0xa6, 0x65, 0x0f, 0x00, 0xa6, 0x0b, 0x00, 0x00,
+  0xd2, 0x29, 0x61, 0x06, 0xd7, 0x25, 0x07, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x84, 0x53, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0xbc, 0x00, 0x17, 0x00,
+  0xa6, 0x65, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xa6, 0x0b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xd2, 0x29, 0x61, 0x06, 0x00, 0x00, 0x00, 0x00,
+  0xd7, 0x25, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x84, 0x53, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x08, 0x00, 0x15, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x30, 0x02, 0x1a, 0x00, 0x6c, 0x00, 0x02, 0x00,
+  0x68, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xc0, 0x01, 0x0a, 0x00, 0x08, 0x00, 0x01, 0x00,
+  0x10, 0x00, 0x00, 0x80, 0x14, 0x00, 0x05, 0x00,
+  0xff, 0xff, 0x00, 0x00, 0x22, 0x05, 0x00, 0x00,
+  0x4f, 0x53, 0x00, 0x00, 0xe8, 0x03, 0x00, 0x00,
+  0x78, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x40, 0x00, 0x00, 0x00, 0xdc, 0x05, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+  0x03, 0x00, 0x00, 0x00, 0xa0, 0x0f, 0x00, 0x00,
+  0xe8, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x80, 0x3a, 0x09, 0x00, 0x80, 0x51, 0x01, 0x00,
+  0x05, 0x00, 0x00, 0x00, 0x58, 0x02, 0x00, 0x00,
+  0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xfc, 0x00, 0x03, 0x00, 0x1f, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x15, 0xe6, 0x04, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x15, 0xe6, 0x04, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x9b, 0x95, 0xb9, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x9b, 0x95, 0xb9, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x18, 0x02, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x06, 0x00,
+  0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+
+// Deleted 8: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN
+//    link/ether 68:7f:74:ba:ef:c7 brd ff:ff:ff:ff:ff:ff
+
+const int kDelLinkMessageEth0InterfaceIndex = 8;
+const unsigned int kDelLinkMessageEth0InterfaceFlags =
+    IFF_BROADCAST | IFF_MULTICAST;
+const unsigned int kDelLinkMessageEth0InterfaceFlagsChange = 0xffffffff;
+const uint32 kDelLinkMessageEth0MTU = 1500;
+const char kDelLinkMessageEth0MACAddress[] = "\x68\x7f\x74\xba\xef\xc7";
+const char kDelLinkMessageEth0InterfacName[] = "eth0";
+const char kDelLinkMessageEth0Qdisc[] = "noop";
+const int kDelLinkMessageEth0OperState = IF_OPER_DOWN;
+
+const unsigned char kDelLinkMessageEth0[] = {
+  0xb8, 0x01, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x01, 0x00, 0x08, 0x00, 0x00, 0x00,
+  0x02, 0x10, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+  0x09, 0x00, 0x03, 0x00, 0x65, 0x74, 0x68, 0x30,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x0d, 0x00,
+  0xe8, 0x03, 0x00, 0x00, 0x05, 0x00, 0x10, 0x00,
+  0x02, 0x00, 0x00, 0x00, 0x05, 0x00, 0x11, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x04, 0x00,
+  0xdc, 0x05, 0x00, 0x00, 0x09, 0x00, 0x06, 0x00,
+  0x6e, 0x6f, 0x6f, 0x70, 0x00, 0x00, 0x00, 0x00,
+  0x20, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x0a, 0x00, 0x01, 0x00, 0x68, 0x7f, 0x74, 0xba,
+  0xef, 0xc7, 0x00, 0x00, 0x0a, 0x00, 0x02, 0x00,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
+  0x60, 0x00, 0x07, 0x00, 0x09, 0x00, 0x00, 0x00,
+  0x0e, 0x00, 0x00, 0x00, 0xfa, 0x05, 0x00, 0x00,
+  0x34, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xbc, 0x00, 0x17, 0x00, 0x09, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0xfa, 0x05, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x34, 0x06, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x15, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x1a, 0x00,
+};
+
+// 8: if8    inet 192.168.10.100/24 brd 192.168.10.255 scope global eth0
+
+const int kNewAddrIPV4InterfaceIndex = 8;
+const char kNewAddrIPV4Address[] = "192.168.10.100";
+const int kNewAddrIPV4AddressPrefix = 24;
+const unsigned char kNewAddrIPV4Scope = RT_SCOPE_UNIVERSE;
+
+const unsigned char kNewAddrIPV4[] = {
+  0x3c, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x02, 0x18, 0x80, 0x00, 0x08, 0x00, 0x00, 0x00,
+  0x08, 0x00, 0x01, 0x00, 0xc0, 0xa8, 0x0a, 0x64,
+  0x08, 0x00, 0x02, 0x00, 0xc0, 0xa8, 0x0a, 0x64,
+  0x08, 0x00, 0x04, 0x00, 0xc0, 0xa8, 0x0a, 0xff,
+  0x09, 0x00, 0x03, 0x00, 0x65, 0x74, 0x68, 0x30,
+  0x00, 0x00, 0x00, 0x00,
+};
+
+
+// Deleted ff02::1:ffa0:688 via ff02::1:ffa0:688 dev if2  metric 0
+
+const int kDelRouteIPV6InterfaceIndex = 2;
+const char kDelRouteIPV6Address[] = "ff02::1:ffa0:688";
+const int kDelRouteIPV6Metric = 0;
+
+const unsigned char kDelRouteIPV6[] = {
+  0x80, 0x00, 0x00, 0x00, 0x19, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x0a, 0x80, 0x00, 0x00, 0xfe, 0x00, 0x00, 0x01,
+  0x00, 0x02, 0x00, 0x00, 0x08, 0x00, 0x0f, 0x00,
+  0xfe, 0x00, 0x00, 0x00, 0x14, 0x00, 0x01, 0x00,
+  0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x01, 0xff, 0xa0, 0x06, 0x88,
+  0x14, 0x00, 0x05, 0x00, 0xff, 0x02, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+  0xff, 0xa0, 0x06, 0x88, 0x08, 0x00, 0x04, 0x00,
+  0x02, 0x00, 0x00, 0x00, 0x08, 0x00, 0x06, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x24, 0x00, 0x0c, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x5f, 0x0c, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+// default via 192.168.17.254 dev if12  metric 9
+
+const int kAddRouteIPV4InterfaceIndex = 12;
+const char kAddRouteIPV4Address[] = "192.168.17.254";
+const int kAddRouteIPV4Metric = 9;
+
+const unsigned char kAddRouteIPV4[] = {
+  0x3c, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x02, 0x00, 0x00, 0x00, 0xfe, 0x03, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x0f, 0x00,
+  0xfe, 0x00, 0x00, 0x00, 0x08, 0x00, 0x06, 0x00,
+  0x09, 0x00, 0x00, 0x00, 0x08, 0x00, 0x05, 0x00,
+  0xc0, 0xa8, 0x11, 0xfe, 0x08, 0x00, 0x04, 0x00,
+  0x0c, 0x00, 0x00, 0x00,
+};
+
+
+// This is the same as kAddRouteIPV4 above, except manually corrupted
+// the second to last parameter
+const unsigned char kAddRouteBusted[] = {
+  0x3c, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x02, 0x00, 0x00, 0x00, 0xfe, 0x03, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x0f, 0x00,
+  0xfe, 0x00, 0x00, 0x00, 0x08, 0x00, 0x06, 0x00,
+  0x09, 0x00, 0x00, 0x00, 0x28, 0x00, 0x05, 0x00,
+  0xc0, 0xa8, 0x11, 0xfe, 0x08, 0x00, 0x04, 0x00,
+  0x0c, 0x00, 0x00, 0x00,
+};
+
+// 192.168.10.1 dev if8 lladdr 00:14:d1:cd:d5:2c REACHABLE
+const unsigned char kAddNeighborMessage[] = {
+  0x4c, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x02, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
+  0x02, 0x00, 0x00, 0x01, 0x08, 0x00, 0x01, 0x00,
+  0xc0, 0xa8, 0x0a, 0x01, 0x0a, 0x00, 0x02, 0x00,
+  0x00, 0x14, 0xd1, 0xcd, 0xd5, 0x2c, 0x00, 0x00,
+  0x08, 0x00, 0x04, 0x00, 0x04, 0x00, 0x00, 0x00,
+  0x14, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x04, 0x00, 0x00, 0x00,
+};
+
+}  // namespace {}
+
+class RTNLMessageTest : public Test {
+ protected:
+  void TestParseLink(const ByteString &packet,
+                     RTNLMessage::MessageMode mode,
+                     int interface_index,
+                     unsigned int flags,
+                     unsigned int change,
+                     ByteString address,
+                     ByteString name,
+                     uint32 mtu,
+                     ByteString qdisc,
+                     int oper_state) {
+    RTNLMessage msg;
+    EXPECT_TRUE(msg.Decode(packet));
+
+    EXPECT_EQ(RTNLMessage::kMessageTypeLink, msg.type());
+    EXPECT_EQ(mode, msg.mode());
+    EXPECT_EQ(interface_index, msg.interface_index());
+
+    RTNLMessage::LinkStatus status = msg.link_status();
+    EXPECT_EQ(flags, status.flags);
+    EXPECT_EQ(change, status.change);
+
+    EXPECT_TRUE(msg.HasAttribute(IFLA_ADDRESS));
+    EXPECT_EQ(address.GetLength(), msg.GetAttribute(IFLA_ADDRESS).GetLength());
+    EXPECT_TRUE(msg.GetAttribute(IFLA_ADDRESS).Equals(address));
+
+    EXPECT_TRUE(msg.HasAttribute(IFLA_IFNAME));
+    EXPECT_EQ(name.GetLength(), msg.GetAttribute(IFLA_IFNAME).GetLength());
+    EXPECT_TRUE(msg.GetAttribute(IFLA_IFNAME).Equals(name));
+
+    EXPECT_TRUE(msg.HasAttribute(IFLA_MTU));
+    uint32 mtu_val;
+    EXPECT_TRUE(msg.GetAttribute(IFLA_MTU).ConvertToCPUUInt32(&mtu_val));
+    EXPECT_EQ(mtu, mtu_val);
+
+    EXPECT_TRUE(msg.HasAttribute(IFLA_QDISC));
+    EXPECT_EQ(qdisc.GetLength(), msg.GetAttribute(IFLA_QDISC).GetLength());
+    EXPECT_TRUE(msg.GetAttribute(IFLA_QDISC).Equals(qdisc));
+
+    EXPECT_TRUE(msg.HasAttribute(IFLA_OPERSTATE));
+    EXPECT_EQ(oper_state, msg.GetAttribute(IFLA_OPERSTATE).GetConstData()[0]);
+  }
+
+  void TestParseAddress(const ByteString &packet,
+                        RTNLMessage::MessageMode mode,
+                        int interface_index,
+                        const IPAddress &address,
+                        int prefix,
+                        unsigned char scope) {
+    RTNLMessage msg;
+
+    EXPECT_TRUE(msg.Decode(packet));
+    EXPECT_EQ(RTNLMessage::kMessageTypeAddress, msg.type());
+    EXPECT_EQ(mode, msg.mode());
+    EXPECT_EQ(interface_index, msg.interface_index());
+    EXPECT_EQ(address.family(), msg.family());
+
+    RTNLMessage::AddressStatus status = msg.address_status();
+    EXPECT_EQ(prefix, status.prefix_len);
+    EXPECT_EQ(scope, status.scope);
+
+    EXPECT_TRUE(msg.HasAttribute(IFA_LOCAL));
+    EXPECT_EQ(address.GetLength(), msg.GetAttribute(IFA_LOCAL).GetLength());
+    EXPECT_TRUE(
+        IPAddress(address.family(),
+            msg.GetAttribute(IFA_LOCAL)).Equals(address));
+  }
+
+  void TestParseRoute(const ByteString &packet,
+                      RTNLMessage::MessageMode mode,
+                      IPAddress::Family family,
+                      int interface_index,
+                      const IPAddress &dst,
+                      int dst_prefix,
+                      const IPAddress &src,
+                      int src_prefix,
+                      const IPAddress &gateway,
+                      unsigned char table,
+                      int protocol,
+                      unsigned char scope,
+                      unsigned char type,
+                      int metric) {
+    RTNLMessage msg;
+
+    EXPECT_TRUE(msg.Decode(packet));
+    EXPECT_EQ(RTNLMessage::kMessageTypeRoute, msg.type());
+    EXPECT_EQ(0, msg.interface_index());
+    EXPECT_EQ(family, msg.family());
+
+    RTNLMessage::RouteStatus status = msg.route_status();
+    EXPECT_EQ(table, status.table);
+    EXPECT_EQ(protocol, status.protocol);
+    EXPECT_EQ(scope, status.scope);
+    EXPECT_EQ(type, status.type);
+
+    if (!dst.IsDefault()) {
+      EXPECT_TRUE(msg.HasAttribute(RTA_DST));
+      EXPECT_TRUE(IPAddress(family, msg.GetAttribute(RTA_DST)).Equals(dst));
+    }
+
+    if (!src.IsDefault()) {
+      EXPECT_TRUE(msg.HasAttribute(RTA_SRC));
+      EXPECT_TRUE(IPAddress(family, msg.GetAttribute(RTA_SRC)).Equals(src));
+    }
+
+    if (!gateway.IsDefault()) {
+      EXPECT_TRUE(msg.HasAttribute(RTA_GATEWAY));
+      EXPECT_TRUE(IPAddress(family,
+                            msg.GetAttribute(RTA_GATEWAY)).Equals(gateway));
+    }
+
+    if (interface_index >= 0) {
+      EXPECT_TRUE(msg.HasAttribute(RTA_OIF));
+      uint32 int_val;
+      EXPECT_TRUE(msg.GetAttribute(RTA_OIF).ConvertToCPUUInt32(&int_val));
+      EXPECT_EQ(interface_index, int_val);
+    } else {
+      EXPECT_FALSE(msg.HasAttribute(RTA_OIF));
+    }
+    if (metric >= 0) {
+      EXPECT_TRUE(msg.HasAttribute(RTA_PRIORITY));
+      uint32 metric_val;
+      EXPECT_TRUE(
+          msg.GetAttribute(RTA_PRIORITY).ConvertToCPUUInt32(&metric_val));
+      EXPECT_EQ(metric, metric_val);
+    } else {
+      EXPECT_FALSE(msg.HasAttribute(RTA_PRIORITY));
+    }
+  }
+};
+
+TEST_F(RTNLMessageTest, NewLinkWlan0) {
+  TestParseLink(ByteString(kNewLinkMessageWlan0, sizeof(kNewLinkMessageWlan0)),
+                RTNLMessage::kMessageModeAdd,
+                kNewLinkMessageWlan0InterfaceIndex,
+                kNewLinkMessageWlan0InterfaceFlags,
+                kNewLinkMessageWlan0InterfaceFlagsChange,
+                ByteString(kNewLinkMessageWlan0MACAddress, false),
+                ByteString(kNewLinkMessageWlan0InterfaceName, true),
+                kNewLinkMessageWlan0MTU,
+                ByteString(kNewLinkMessageWlan0Qdisc, true),
+                kNewLinkMessageWlan0OperState);
+}
+
+TEST_F(RTNLMessageTest, DelLinkEth0) {
+  TestParseLink(ByteString(kDelLinkMessageEth0, sizeof(kDelLinkMessageEth0)),
+                RTNLMessage::kMessageModeDelete,
+                kDelLinkMessageEth0InterfaceIndex,
+                kDelLinkMessageEth0InterfaceFlags,
+                kDelLinkMessageEth0InterfaceFlagsChange,
+                ByteString(kDelLinkMessageEth0MACAddress, false),
+                ByteString(kDelLinkMessageEth0InterfacName, true),
+                kDelLinkMessageEth0MTU,
+                ByteString(kDelLinkMessageEth0Qdisc, true),
+                kDelLinkMessageEth0OperState);
+}
+
+TEST_F(RTNLMessageTest, NewAddrIPv4) {
+  IPAddress addr(IPAddress::kAddressFamilyIPv4);
+
+  EXPECT_TRUE(addr.SetAddressFromString(kNewAddrIPV4Address));
+  TestParseAddress(ByteString(kNewAddrIPV4, sizeof(kNewAddrIPV4)),
+                   RTNLMessage::kMessageModeAdd,
+                   kNewAddrIPV4InterfaceIndex,
+                   addr,
+                   kNewAddrIPV4AddressPrefix,
+                   kNewAddrIPV4Scope);
+}
+
+TEST_F(RTNLMessageTest, DelRouteIPv6) {
+  IPAddress dst(IPAddress::kAddressFamilyIPv6);
+  IPAddress src(IPAddress::kAddressFamilyIPv6);
+  IPAddress gateway(IPAddress::kAddressFamilyIPv6);
+
+  EXPECT_TRUE(dst.SetAddressFromString(kDelRouteIPV6Address));
+  src.SetAddressToDefault();
+  EXPECT_TRUE(gateway.SetAddressFromString(kDelRouteIPV6Address));
+
+  TestParseRoute(ByteString(kDelRouteIPV6, sizeof(kDelRouteIPV6)),
+                 RTNLMessage::kMessageModeDelete,
+                 IPAddress::kAddressFamilyIPv6,
+                 kDelRouteIPV6InterfaceIndex,
+                 dst,
+                 0,
+                 src,
+                 0,
+                 gateway,
+                 RT_TABLE_MAIN,
+                 RTPROT_UNSPEC,
+                 RT_SCOPE_UNIVERSE,
+                 RTN_UNICAST,
+                 kDelRouteIPV6Metric);
+}
+
+TEST_F(RTNLMessageTest, AddRouteIPv4) {
+  IPAddress dst(IPAddress::kAddressFamilyIPv4);
+  IPAddress src(IPAddress::kAddressFamilyIPv4);
+  IPAddress gateway(IPAddress::kAddressFamilyIPv4);
+
+  dst.SetAddressToDefault();
+  src.SetAddressToDefault();
+  EXPECT_TRUE(gateway.SetAddressFromString(kAddRouteIPV4Address));
+
+  TestParseRoute(ByteString(kAddRouteIPV4, sizeof(kAddRouteIPV4)),
+                 RTNLMessage::kMessageModeAdd,
+                 IPAddress::kAddressFamilyIPv4,
+                 kAddRouteIPV4InterfaceIndex,
+                 dst,
+                 0,
+                 src,
+                 0,
+                 gateway,
+                 RT_TABLE_MAIN,
+                 RTPROT_BOOT,
+                 RT_SCOPE_UNIVERSE,
+                 RTN_UNICAST,
+                 kAddRouteIPV4Metric);
+}
+
+TEST_F(RTNLMessageTest, AddRouteBusted) {
+  // RTNLMessage should list parse errors as kMessageUnknown
+  RTNLMessage msg;
+  EXPECT_FALSE(msg.Decode(
+      ByteString(kAddRouteBusted, sizeof(kAddRouteBusted))));
+}
+
+TEST_F(RTNLMessageTest, AddNeighbor) {
+  // RTNLMessage doesn't parse Add-Neighbor messages -- ensure this fails
+  RTNLMessage msg;
+  EXPECT_FALSE(msg.Decode(
+      ByteString(kAddNeighborMessage, sizeof(kAddNeighborMessage))));
+}
+
+TEST_F(RTNLMessageTest, Encode) {
+  RTNLMessage msg(RTNLMessage::kMessageTypeRoute,
+                  RTNLMessage::kMessageModeAdd,
+                  0, 1, 2, 0,
+                  IPAddress::kAddressFamilyIPv4);
+  IPAddress dst(IPAddress::kAddressFamilyIPv4);
+  IPAddress src(IPAddress::kAddressFamilyIPv4);
+  IPAddress gateway(IPAddress::kAddressFamilyIPv4);
+
+  dst.SetAddressToDefault();
+  src.SetAddressToDefault();
+  EXPECT_TRUE(gateway.SetAddressFromString("192.168.0.1"));
+
+  msg.set_route_status(RTNLMessage::RouteStatus(
+      0, 0, RT_TABLE_MAIN, RTPROT_BOOT, RT_SCOPE_UNIVERSE, RTN_UNICAST, 0));
+  msg.SetAttribute(RTA_DST, dst.address());
+  msg.SetAttribute(RTA_SRC, src.address());
+  msg.SetAttribute(RTA_GATEWAY, gateway.address());
+  msg.SetAttribute(RTA_OIF, ByteString::CreateFromCPUUInt32(12));
+  msg.SetAttribute(RTA_PRIORITY, ByteString::CreateFromCPUUInt32(13));
+
+
+  TestParseRoute(msg.Encode(),
+                 RTNLMessage::kMessageModeAdd,
+                 IPAddress::kAddressFamilyIPv4,
+                 12,
+                 dst,
+                 0,
+                 src,
+                 0,
+                 gateway,
+                 RT_TABLE_MAIN,
+                 RTPROT_BOOT,
+                 RT_SCOPE_UNIVERSE,
+                 RTN_UNICAST,
+                 13);
+}
+
+}  // namespace shill