1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "host/libs/config/openwrt_args.h"
18
19 namespace cuttlefish {
20
21 namespace {
22
getIpAddress(int c_class,int d_class)23 std::string getIpAddress(int c_class, int d_class) {
24 return "192.168." + std::to_string(c_class) + "." + std::to_string(d_class);
25 }
26
27 } // namespace
28
OpenwrtArgsFromConfig(const CuttlefishConfig::InstanceSpecific & instance)29 std::unordered_map<std::string, std::string> OpenwrtArgsFromConfig(
30 const CuttlefishConfig::InstanceSpecific& instance) {
31 std::unordered_map<std::string, std::string> openwrt_args;
32 int instance_num = cuttlefish::GetInstance();
33
34 int c_class_base = (instance_num - 1) / 64;
35 int d_class_base = (instance_num - 1) % 64 * 4;
36
37 // IP address for OpenWRT is pre-defined in init script of android-cuttlefish
38 // github repository by using tap interfaces created with the script.
39 // (github) base/debian/cuttlefish-base.cuttlefish-host-resources.init
40 // The command 'crosvm run' uses openwrt_args for passing the arguments into
41 // /proc/cmdline of OpenWRT instance.
42 // (AOSP) device/google/cuttlefish/host/commands/run_cvd/launch/open_wrt.cpp
43 // In OpenWRT instance, the script 0_default_config reads /proc/cmdline so
44 // that it can apply arguments defined here.
45 // (AOSP) external/openwrt-prebuilts/shared/uci-defaults/0_default_config
46 if (instance.use_bridged_wifi_tap()) {
47 openwrt_args["bridged_wifi_tap"] = "true";
48 openwrt_args["wan_gateway"] = getIpAddress(96, 1);
49 // TODO(seungjaeyoo) : Remove config after using DHCP server outside OpenWRT
50 // instead.
51 openwrt_args["wan_ipaddr"] = getIpAddress(96, d_class_base + 2);
52 openwrt_args["wan_broadcast"] = getIpAddress(96, d_class_base + 3);
53
54 } else {
55 openwrt_args["bridged_wifi_tap"] = "false";
56 openwrt_args["wan_gateway"] =
57 getIpAddress(94 + c_class_base, d_class_base + 1);
58 openwrt_args["wan_ipaddr"] =
59 getIpAddress(94 + c_class_base, d_class_base + 2);
60 openwrt_args["wan_broadcast"] =
61 getIpAddress(94 + c_class_base, d_class_base + 3);
62 }
63
64 return openwrt_args;
65 }
66
67 } // namespace cuttlefish
68