1 //
2 // Copyright (C) 2012 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 "shill/link_monitor.h"
18
19 #include <string>
20
21 #include <base/bind.h>
22
23 #include "shill/active_link_monitor.h"
24 #include "shill/connection.h"
25 #include "shill/device_info.h"
26 #include "shill/event_dispatcher.h"
27 #include "shill/logging.h"
28 #include "shill/net/shill_time.h"
29 #include "shill/passive_link_monitor.h"
30
31 using base::Bind;
32 using base::Unretained;
33 using std::string;
34
35 namespace shill {
36
37 namespace Logging {
38 static auto kModuleLogScope = ScopeLogger::kLink;
ObjectID(Connection * c)39 static string ObjectID(Connection* c) { return c->interface_name(); }
40 }
41
42 const int LinkMonitor::kDefaultTestPeriodMilliseconds =
43 ActiveLinkMonitor::kDefaultTestPeriodMilliseconds;
44 const int LinkMonitor::kFailureThreshold =
45 ActiveLinkMonitor::kFailureThreshold;
46 const char LinkMonitor::kDefaultLinkMonitorTechnologies[] = "wifi";
47
LinkMonitor(const ConnectionRefPtr & connection,EventDispatcher * dispatcher,Metrics * metrics,DeviceInfo * device_info,const FailureCallback & failure_callback,const GatewayChangeCallback & gateway_change_callback)48 LinkMonitor::LinkMonitor(const ConnectionRefPtr& connection,
49 EventDispatcher* dispatcher,
50 Metrics* metrics,
51 DeviceInfo* device_info,
52 const FailureCallback& failure_callback,
53 const GatewayChangeCallback& gateway_change_callback)
54 : connection_(connection),
55 dispatcher_(dispatcher),
56 metrics_(metrics),
57 failure_callback_(failure_callback),
58 gateway_change_callback_(gateway_change_callback),
59 active_link_monitor_(
60 new ActiveLinkMonitor(
61 connection,
62 dispatcher,
63 metrics,
64 device_info,
65 Bind(&LinkMonitor::OnActiveLinkMonitorFailure,
66 Unretained(this)),
67 Bind(&LinkMonitor::OnActiveLinkMonitorSuccess,
68 Unretained(this)))),
69 passive_link_monitor_(
70 new PassiveLinkMonitor(
71 connection,
72 dispatcher,
73 Bind(&LinkMonitor::OnPassiveLinkMonitorResultCallback,
74 Unretained(this)))),
75 time_(Time::GetInstance()) {
76 }
77
~LinkMonitor()78 LinkMonitor::~LinkMonitor() {
79 Stop();
80 }
81
Start()82 bool LinkMonitor::Start() {
83 Stop();
84 time_->GetTimeMonotonic(&started_monitoring_at_);
85 // Start active link monitor.
86 return active_link_monitor_->Start(
87 ActiveLinkMonitor::kDefaultTestPeriodMilliseconds);
88 }
89
Stop()90 void LinkMonitor::Stop() {
91 SLOG(connection_.get(), 2) << "In " << __func__ << ".";
92 timerclear(&started_monitoring_at_);
93 active_link_monitor_->Stop();
94 passive_link_monitor_->Stop();
95 gateway_mac_address_.Clear();
96 }
97
OnAfterResume()98 void LinkMonitor::OnAfterResume() {
99 // Preserve gateway settings across resume.
100 ByteString prior_gateway_mac_address(gateway_mac_address_);
101 bool gateway_supports_unicast_arp =
102 active_link_monitor_->gateway_supports_unicast_arp();
103 Stop();
104 gateway_mac_address_ = prior_gateway_mac_address;
105 active_link_monitor_->set_gateway_mac_address(gateway_mac_address_);
106 active_link_monitor_->set_gateway_supports_unicast_arp(
107 gateway_supports_unicast_arp);
108
109 active_link_monitor_->Start(ActiveLinkMonitor::kFastTestPeriodMilliseconds);
110 }
111
GetResponseTimeMilliseconds() const112 int LinkMonitor::GetResponseTimeMilliseconds() const {
113 return active_link_monitor_->GetResponseTimeMilliseconds();
114 }
115
IsGatewayFound() const116 bool LinkMonitor::IsGatewayFound() const {
117 return !gateway_mac_address_.IsZero();
118 }
119
OnActiveLinkMonitorFailure(Metrics::LinkMonitorFailure failure,int broadcast_failure_count,int unicast_failure_count)120 void LinkMonitor::OnActiveLinkMonitorFailure(
121 Metrics::LinkMonitorFailure failure,
122 int broadcast_failure_count,
123 int unicast_failure_count) {
124 failure_callback_.Run();
125
126 struct timeval now, elapsed_time;
127 time_->GetTimeMonotonic(&now);
128 timersub(&now, &started_monitoring_at_, &elapsed_time);
129
130 metrics_->NotifyLinkMonitorFailure(
131 connection_->technology(),
132 failure,
133 elapsed_time.tv_sec,
134 broadcast_failure_count,
135 unicast_failure_count);
136
137 Stop();
138 }
139
OnActiveLinkMonitorSuccess()140 void LinkMonitor::OnActiveLinkMonitorSuccess() {
141 if (!gateway_mac_address_.Equals(
142 active_link_monitor_->gateway_mac_address())) {
143 gateway_mac_address_ = active_link_monitor_->gateway_mac_address();
144 // Notify device of the new gateway mac address.
145 gateway_change_callback_.Run();
146 }
147
148 // Start passive link monitoring.
149 passive_link_monitor_->Start(PassiveLinkMonitor::kDefaultMonitorCycles);
150 }
151
OnPassiveLinkMonitorResultCallback(bool status)152 void LinkMonitor::OnPassiveLinkMonitorResultCallback(bool status) {
153 // TODO(zqiu): Add metrics for tracking passive link monitor results.
154
155 // Start active monitor
156 active_link_monitor_->Start(
157 ActiveLinkMonitor::kDefaultTestPeriodMilliseconds);
158 }
159
160 } // namespace shill
161