callback80211_metrics.cc

// Copyright (c) 2012 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 "shill/callback80211_metrics.h"

#include "shill/config80211.h"
#include "shill/ieee80211.h"
#include "shill/link_monitor.h"
#include "shill/logging.h"
#include "shill/metrics.h"
#include "shill/nl80211_message.h"

namespace shill {

Callback80211Metrics::Callback80211Metrics(const Config80211 &config80211,
                                           Metrics *metrics)
    : metrics_(metrics),
      nl80211_message_type_(NetlinkMessage::kIllegalMessageType) {}

void Callback80211Metrics::InitNl80211FamilyId(
    const Config80211 &config80211) {
  nl80211_message_type_ =
      config80211.GetMessageType(Nl80211Message::kMessageTypeString);
}

void Callback80211Metrics::CollectDisconnectStatistics(
    const NetlinkMessage &netlink_message) {
  if (nl80211_message_type_ == NetlinkMessage::kIllegalMessageType) {
    LOG(ERROR) << "Somehow, nl80211_message_type_ didn't get set correctly";
    return;
  }

  // We only handle deauthenticate messages, which are nl80211 messages.
  if (netlink_message.message_type() != nl80211_message_type_) {
    return;
  }
  const Nl80211Message &message =
      * reinterpret_cast<const Nl80211Message *>(&netlink_message);

  SLOG(WiFi, 3) << "Received " << message.command_string()
                << " (" << + message.command() << ")";
  if (metrics_ &&
      message.command() == DeauthenticateMessage::kCommand) {
    Metrics::WiFiDisconnectByWhom by_whom =
        message.const_attributes()->IsFlagAttributeTrue(
            NL80211_ATTR_DISCONNECTED_BY_AP) ?
                    Metrics::kDisconnectedByAp : Metrics::kDisconnectedNotByAp;
    uint16_t reason = static_cast<uint16_t>(
        IEEE_80211::kReasonCodeInvalid);
    ByteString rawdata;
    if (message.const_attributes()->GetRawAttributeValue(NL80211_ATTR_FRAME,
                                                          &rawdata)) {
      Nl80211Frame frame(rawdata);
      reason = frame.reason();
    }
    IEEE_80211::WiFiReasonCode reason_enum =
        static_cast<IEEE_80211::WiFiReasonCode>(reason);
    metrics_->Notify80211Disconnect(by_whom, reason_enum);
  }
}

}  // namespace shill.