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//
// Copyright (C) 2012 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.
//
#include "shill/link_monitor.h"
#include <string>
#include <base/bind.h>
#include "shill/active_link_monitor.h"
#include "shill/connection.h"
#include "shill/device_info.h"
#include "shill/event_dispatcher.h"
#include "shill/logging.h"
#include "shill/net/shill_time.h"
#include "shill/passive_link_monitor.h"
using base::Bind;
using base::Unretained;
using std::string;
namespace shill {
namespace Logging {
static auto kModuleLogScope = ScopeLogger::kLink;
static string ObjectID(Connection* c) { return c->interface_name(); }
}
const int LinkMonitor::kDefaultTestPeriodMilliseconds =
ActiveLinkMonitor::kDefaultTestPeriodMilliseconds;
const int LinkMonitor::kFailureThreshold =
ActiveLinkMonitor::kFailureThreshold;
const char LinkMonitor::kDefaultLinkMonitorTechnologies[] = "wifi";
LinkMonitor::LinkMonitor(const ConnectionRefPtr& connection,
EventDispatcher* dispatcher,
Metrics* metrics,
DeviceInfo* device_info,
const FailureCallback& failure_callback,
const GatewayChangeCallback& gateway_change_callback)
: connection_(connection),
dispatcher_(dispatcher),
metrics_(metrics),
failure_callback_(failure_callback),
gateway_change_callback_(gateway_change_callback),
active_link_monitor_(
new ActiveLinkMonitor(
connection,
dispatcher,
metrics,
device_info,
Bind(&LinkMonitor::OnActiveLinkMonitorFailure,
Unretained(this)),
Bind(&LinkMonitor::OnActiveLinkMonitorSuccess,
Unretained(this)))),
passive_link_monitor_(
new PassiveLinkMonitor(
connection,
dispatcher,
Bind(&LinkMonitor::OnPassiveLinkMonitorResultCallback,
Unretained(this)))),
time_(Time::GetInstance()) {
}
LinkMonitor::~LinkMonitor() {
Stop();
}
bool LinkMonitor::Start() {
Stop();
time_->GetTimeMonotonic(&started_monitoring_at_);
// Start active link monitor.
return active_link_monitor_->Start(
ActiveLinkMonitor::kDefaultTestPeriodMilliseconds);
}
void LinkMonitor::Stop() {
SLOG(connection_.get(), 2) << "In " << __func__ << ".";
timerclear(&started_monitoring_at_);
active_link_monitor_->Stop();
passive_link_monitor_->Stop();
gateway_mac_address_.Clear();
}
void LinkMonitor::OnAfterResume() {
// Preserve gateway settings across resume.
ByteString prior_gateway_mac_address(gateway_mac_address_);
bool gateway_supports_unicast_arp =
active_link_monitor_->gateway_supports_unicast_arp();
Stop();
gateway_mac_address_ = prior_gateway_mac_address;
active_link_monitor_->set_gateway_mac_address(gateway_mac_address_);
active_link_monitor_->set_gateway_supports_unicast_arp(
gateway_supports_unicast_arp);
active_link_monitor_->Start(ActiveLinkMonitor::kFastTestPeriodMilliseconds);
}
int LinkMonitor::GetResponseTimeMilliseconds() const {
return active_link_monitor_->GetResponseTimeMilliseconds();
}
bool LinkMonitor::IsGatewayFound() const {
return !gateway_mac_address_.IsZero();
}
void LinkMonitor::OnActiveLinkMonitorFailure(
Metrics::LinkMonitorFailure failure,
int broadcast_failure_count,
int unicast_failure_count) {
failure_callback_.Run();
struct timeval now, elapsed_time;
time_->GetTimeMonotonic(&now);
timersub(&now, &started_monitoring_at_, &elapsed_time);
metrics_->NotifyLinkMonitorFailure(
connection_->technology(),
failure,
elapsed_time.tv_sec,
broadcast_failure_count,
unicast_failure_count);
Stop();
}
void LinkMonitor::OnActiveLinkMonitorSuccess() {
if (!gateway_mac_address_.Equals(
active_link_monitor_->gateway_mac_address())) {
gateway_mac_address_ = active_link_monitor_->gateway_mac_address();
// Notify device of the new gateway mac address.
gateway_change_callback_.Run();
}
// Start passive link monitoring.
passive_link_monitor_->Start(PassiveLinkMonitor::kDefaultMonitorCycles);
}
void LinkMonitor::OnPassiveLinkMonitorResultCallback(bool status) {
// TODO(zqiu): Add metrics for tracking passive link monitor results.
// Start active monitor
active_link_monitor_->Start(
ActiveLinkMonitor::kDefaultTestPeriodMilliseconds);
}
} // namespace shill
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