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Merge "Broadcast interface changes through binder" am: 4086519433 am: f341c268dd
[android-x86/system-connectivity-wificond.git] / server.cpp
1 /*
2  * Copyright (C) 2016 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 "wificond/server.h"
18
19 #include <android-base/logging.h>
20
21 #include "wificond/net/netlink_utils.h"
22 #include "wificond/scanning/scan_utils.h"
23
24 using android::binder::Status;
25 using android::sp;
26 using android::IBinder;
27 using std::string;
28 using std::vector;
29 using std::unique_ptr;
30 using android::net::wifi::IApInterface;
31 using android::net::wifi::IClientInterface;
32 using android::net::wifi::IInterfaceEventCallback;
33 using android::wifi_hal::DriverTool;
34 using android::wifi_system::HalTool;
35 using android::wifi_system::HostapdManager;
36 using android::wifi_system::InterfaceTool;
37 using android::wifi_system::SupplicantManager;
38
39 namespace android {
40 namespace wificond {
41
42 Server::Server(unique_ptr<HalTool> hal_tool,
43                unique_ptr<InterfaceTool> if_tool,
44                unique_ptr<DriverTool> driver_tool,
45                unique_ptr<SupplicantManager> supplicant_manager,
46                unique_ptr<HostapdManager> hostapd_manager,
47                NetlinkUtils* netlink_utils,
48                ScanUtils* scan_utils)
49     : hal_tool_(std::move(hal_tool)),
50       if_tool_(std::move(if_tool)),
51       driver_tool_(std::move(driver_tool)),
52       supplicant_manager_(std::move(supplicant_manager)),
53       hostapd_manager_(std::move(hostapd_manager)),
54       netlink_utils_(netlink_utils),
55       scan_utils_(scan_utils) {
56 }
57
58 Status Server::RegisterCallback(const sp<IInterfaceEventCallback>& callback) {
59   for (auto& it : interface_event_callbacks_) {
60     if (IInterface::asBinder(callback) == IInterface::asBinder(it)) {
61       LOG(WARNING) << "Ignore duplicate interface event callback registration";
62       return Status::ok();
63     }
64   }
65   LOG(INFO) << "New interface event callback registered";
66   interface_event_callbacks_.push_back(callback);
67   return Status::ok();
68 }
69
70 Status Server::UnregisterCallback(const sp<IInterfaceEventCallback>& callback) {
71   for (auto it = interface_event_callbacks_.begin();
72        it != interface_event_callbacks_.end();
73        it++) {
74     if (IInterface::asBinder(callback) == IInterface::asBinder(*it)) {
75       interface_event_callbacks_.erase(it);
76       LOG(INFO) << "Unregister interface event callback";
77       return Status::ok();
78     }
79   }
80   LOG(WARNING) << "Failed to find registered interface event callback"
81                << " to unregister";
82   return Status::ok();
83 }
84
85
86 Status Server::createApInterface(sp<IApInterface>* created_interface) {
87   string interface_name;
88   uint32_t interface_index;
89   vector<uint8_t> interface_mac_addr;
90   if (!SetupInterfaceForMode(DriverTool::kFirmwareModeAp,
91                              &interface_name,
92                              &interface_index,
93                              &interface_mac_addr)) {
94     return Status::ok();  // Logging was done internally
95   }
96
97   unique_ptr<ApInterfaceImpl> ap_interface(new ApInterfaceImpl(
98       interface_name,
99       interface_index,
100       if_tool_.get(),
101       hostapd_manager_.get()));
102   *created_interface = ap_interface->GetBinder();
103   ap_interfaces_.push_back(std::move(ap_interface));
104   BroadcastApInterfaceReady(ap_interfaces_.back()->GetBinder());
105
106   return Status::ok();
107 }
108
109 Status Server::createClientInterface(sp<IClientInterface>* created_interface) {
110   string interface_name;
111   uint32_t interface_index;
112   vector<uint8_t> interface_mac_addr;
113   if (!SetupInterfaceForMode(DriverTool::kFirmwareModeSta,
114                              &interface_name,
115                              &interface_index,
116                              &interface_mac_addr)) {
117     return Status::ok();  // Logging was done internally
118   }
119
120   unique_ptr<ClientInterfaceImpl> client_interface(new ClientInterfaceImpl(
121       interface_name,
122       interface_index,
123       interface_mac_addr,
124       supplicant_manager_.get(),
125       scan_utils_));
126   *created_interface = client_interface->GetBinder();
127   client_interfaces_.push_back(std::move(client_interface));
128   BroadcastClientInterfaceReady(client_interfaces_.back()->GetBinder());
129
130   return Status::ok();
131 }
132
133 Status Server::tearDownInterfaces() {
134   for (auto& it : client_interfaces_) {
135     BroadcastClientInterfaceTornDown(it->GetBinder());
136   }
137   client_interfaces_.clear();
138
139   for (auto& it : ap_interfaces_) {
140     BroadcastApInterfaceTornDown(it->GetBinder());
141   }
142   ap_interfaces_.clear();
143
144   if (!driver_tool_->UnloadDriver()) {
145     LOG(ERROR) << "Failed to unload WiFi driver!";
146   }
147   return Status::ok();
148 }
149
150 void Server::CleanUpSystemState() {
151   supplicant_manager_->StopSupplicant();
152   hostapd_manager_->StopHostapd();
153
154   uint32_t phy_index = 0;
155   uint32_t if_index = 0;
156   vector<uint8_t> mac;
157   string if_name;
158   if (netlink_utils_->GetWiphyIndex(&phy_index) &&
159       netlink_utils_->GetInterfaceInfo(phy_index,
160                                        &if_name,
161                                        &if_index,
162                                        &mac)) {
163     // If the kernel knows about a network interface, mark it as down.
164     // This prevents us from beaconing as an AP, or remaining associated
165     // as a client.
166     if_tool_->SetUpState(if_name.c_str(), false);
167   }
168   // "unloading the driver" is frequently a no-op in systems that
169   // don't have kernel modules, but just in case.
170   driver_tool_->UnloadDriver();
171 }
172
173 bool Server::SetupInterfaceForMode(int mode,
174                                    string* interface_name,
175                                    uint32_t* interface_index,
176                                    vector<uint8_t>* interface_mac_addr) {
177   if (!ap_interfaces_.empty() || !client_interfaces_.empty()) {
178     // In the future we may support multiple interfaces at once.  However,
179     // today, we support just one.
180     LOG(ERROR) << "Cannot create AP interface when other interfaces exist";
181     return false;
182   }
183
184   string result;
185   if (!driver_tool_->LoadDriver()) {
186     LOG(ERROR) << "Failed to load WiFi driver!";
187     return false;
188   }
189   if (!driver_tool_->ChangeFirmwareMode(mode)) {
190     LOG(ERROR) << "Failed to change WiFi firmware mode!";
191     return false;
192   }
193
194   if (!RefreshWiphyIndex()) {
195     return false;
196   }
197
198   if (!netlink_utils_->GetInterfaceInfo(wiphy_index_,
199                                         interface_name,
200                                         interface_index,
201                                         interface_mac_addr)) {
202     LOG(ERROR) << "Failed to get interface info from kernel";
203     return false;
204   }
205
206   return true;
207 }
208
209 bool Server::RefreshWiphyIndex() {
210   if (!netlink_utils_->GetWiphyIndex(&wiphy_index_)) {
211     LOG(ERROR) << "Failed to get wiphy index";
212     return false;
213   }
214   return true;
215 }
216
217 void Server::BroadcastClientInterfaceReady(
218     sp<IClientInterface> network_interface) {
219   for (auto& it : interface_event_callbacks_) {
220     it->OnClientInterfaceReady(network_interface);
221   }
222 }
223
224 void Server::BroadcastApInterfaceReady(
225     sp<IApInterface> network_interface) {
226   for (auto& it : interface_event_callbacks_) {
227     it->OnApInterfaceReady(network_interface);
228   }
229 }
230
231 void Server::BroadcastClientInterfaceTornDown(
232     sp<IClientInterface> network_interface) {
233   for (auto& it : interface_event_callbacks_) {
234     it->OnClientTorndownEvent(network_interface);
235   }
236 }
237
238 void Server::BroadcastApInterfaceTornDown(
239     sp<IApInterface> network_interface) {
240   for (auto& it : interface_event_callbacks_) {
241     it->OnApTorndownEvent(network_interface);
242   }
243 }
244
245 }  // namespace wificond
246 }  // namespace android