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/wifi/callback80211_metrics.h"
18
19 #include <string>
20
21 #include "shill/logging.h"
22 #include "shill/metrics.h"
23 #include "shill/net/ieee80211.h"
24 #include "shill/net/netlink_manager.h"
25 #include "shill/net/nl80211_message.h"
26
27 using std::string;
28
29 namespace shill {
30
31 namespace Logging {
32 static auto kModuleLogScope = ScopeLogger::kWiFi;
ObjectID(const Callback80211Metrics * c)33 static string ObjectID(const Callback80211Metrics* c) {
34 return "(callback80211metrics)";
35 }
36 }
37
Callback80211Metrics(Metrics * metrics)38 Callback80211Metrics::Callback80211Metrics(Metrics* metrics)
39 : metrics_(metrics) {}
40
WiFiReasonCodeFromUint16(uint16_t reason) const41 IEEE_80211::WiFiReasonCode Callback80211Metrics::WiFiReasonCodeFromUint16(
42 uint16_t reason) const {
43 IEEE_80211::WiFiReasonCode reason_enum = IEEE_80211::kReasonCodeInvalid;
44 if (reason == IEEE_80211::kReasonCodeReserved0 ||
45 reason == IEEE_80211::kReasonCodeReserved12 ||
46 (reason >= IEEE_80211::kReasonCodeReservedBegin25 &&
47 reason <= IEEE_80211::kReasonCodeReservedEnd31) ||
48 (reason >= IEEE_80211::kReasonCodeReservedBegin40 &&
49 reason <= IEEE_80211::kReasonCodeReservedEnd44) ||
50 reason >= IEEE_80211::kReasonCodeMax) {
51 SLOG(this, 1) << "Invalid reason code in disconnect message";
52 reason_enum = IEEE_80211::kReasonCodeInvalid;
53 } else {
54 reason_enum = static_cast<IEEE_80211::WiFiReasonCode>(reason);
55 }
56 return reason_enum;
57 }
58
CollectDisconnectStatistics(const NetlinkMessage & netlink_message)59 void Callback80211Metrics::CollectDisconnectStatistics(
60 const NetlinkMessage& netlink_message) {
61 if (!metrics_) {
62 return;
63 }
64 // We only handle disconnect and deauthenticate messages, both of which are
65 // nl80211 messages.
66 if (netlink_message.message_type() != Nl80211Message::GetMessageType()) {
67 return;
68 }
69 const Nl80211Message& message =
70 * reinterpret_cast<const Nl80211Message*>(&netlink_message);
71
72 // Station-instigated disconnects provide their information in the
73 // deauthenticate message but AP-instigated disconnects provide it in the
74 // disconnect message.
75 uint16_t reason = IEEE_80211::kReasonCodeUnspecified;
76 if (message.command() == DeauthenticateMessage::kCommand) {
77 SLOG(this, 3) << "Handling Deauthenticate Message";
78 message.Print(3, 3);
79 // If there's no frame, this is probably an AP-caused disconnect and
80 // there'll be a disconnect message to tell us about that.
81 ByteString rawdata;
82 if (!message.const_attributes()->GetRawAttributeValue(NL80211_ATTR_FRAME,
83 &rawdata)) {
84 SLOG(this, 5) << "No frame in deauthenticate message, ignoring";
85 return;
86 }
87 Nl80211Frame frame(rawdata);
88 reason = frame.reason();
89 } else if (message.command() == DisconnectMessage::kCommand) {
90 SLOG(this, 3) << "Handling Disconnect Message";
91 message.Print(3, 3);
92 // If there's no reason code, this is probably a STA-caused disconnect and
93 // there was be a disconnect message to tell us about that.
94 if (!message.const_attributes()->GetU16AttributeValue(
95 NL80211_ATTR_REASON_CODE, &reason)) {
96 SLOG(this, 5) << "No reason code in disconnect message, ignoring";
97 return;
98 }
99 } else {
100 return;
101 }
102
103 IEEE_80211::WiFiReasonCode reason_enum = WiFiReasonCodeFromUint16(reason);
104
105 Metrics::WiFiDisconnectByWhom by_whom =
106 message.const_attributes()->IsFlagAttributeTrue(
107 NL80211_ATTR_DISCONNECTED_BY_AP) ? Metrics::kDisconnectedByAp :
108 Metrics::kDisconnectedNotByAp;
109 SLOG(this, 1) << "Notify80211Disconnect by " << (by_whom ? "station" : "AP")
110 << " because:" << reason_enum;
111 metrics_->Notify80211Disconnect(by_whom, reason_enum);
112 }
113
114 } // namespace shill.
115