android wifi 断开,android wifi断开原因分析

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最近在解bug的过程中经常遇到密码正确但处于saved的状态，总结原因有已下几种：

1 在ASSOCIATING阶段由于丢包导致ASSOC REJECT

D/WifiMonitor( 924): Event [IFNAME=wlan0 CTRL-EVENT-DISCONNECTED bssid=08:cc:68:9e:ac:20 reason=3 locally_generated=1]

I/wpa_supplicant(23065): wlan0: CTRL-EVENT-ASSOC-REJECT bssid=0e:bd:51:c7:b6:33 status_code=1

2 在4WAY_HANDSHAKE阶段由于密码错误、丢帧或者弱信号丢包导致WRONG_KEY：

密码错误在4WAY_HANDSHAKE阶段中的2/4次握手会显示wrong key。

如果已经连接过则显示

I/wpa_supplicant(19043): wlan0: CTRL-EVENT-SSID-TEMP-DISABLED id=1 ssid="Onetouch Idol 3 (4.7)" auth_failures=1 duration=5 reason=WRONG_KEY。

丢帧导致连接断开：

wlan: [24597:E :PE ] limHandleMissedBeaconInd: 2121: Sending EXIT_BMPS_IND to SME due to Missed beacon from FW

信号弱导致断开：

I/wpa_supplicant(31023): wlan0: CTRL-EVENT-DISCONNECTED bssid=c8:3a:35:2b:71:30 reason=0

E/WifiStateMachine( 821): NETWORK_DISCONNECTION_EVENT in connected state BSSID=c8:3a:35:2b:71:30 RSSI=-89 freq=2437 was debouncing=false reason=0 ajst=0

reason=0表示因为信号弱而断开。

3 4WAY_HANDSHAK成功但DHCP FAILURE

四步握手成功但获取IP地址失败

E/WifiStateMachine(28360): WifiStateMachine DHCP failure count=0

E/WifiConfigStore(28360): message=DHCP FAILURE

4 被AP踢出，这个原因需要sniffer log分析

reason=2，reason=7，reason=15代表被AP踢出，在kernel log中可以找到对应的deauth信息。

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-DISCONNECTED bssid=c4:14:3c:29:47:05 reason=7

wlan: [28055:E :PE ] limProcessDeauthFrame: 144: Received Deauth frame for Addr: 44:a4:2d:52:bc:a5 (mlm state = eLIM_MLM_LINK_ESTABLISHED_STATE, sme state = 12 systemrole = 3) with reason code 7 from c4:14:3c:29:47:05

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-DISCONNECTED bssid=1c:1d:86:e9:e2:85 reason=15

wlan: [28055:E :PE ] limProcessDeauthFrame: 144: Received Deauth frame for Addr: 44:a4:2d:52:bc:a5 (mlm state = eLIM_MLM_LINK_ESTABLISHED_STATE, sme state = 12 systemrole = 3) with reason code 15 from 1c:1d:86:e9:e2:85

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-DISCONNECTED bssid=c4:14:3c:29:47:25 reason=2

wlan: [28055:E :PE ] limProcessDeauthFrame: 144: Received Deauth frame for Addr: 44:a4:2d:52:bc:a5 (mlm state = eLIM_MLM_LINK_ESTABLISHED_STATE, sme state = 12 systemrole = 3) with reason code 2 from c4:14:3c:29:47:25

5 在信号相差5-10rssi的时候会发生roam，roam是在firmware层发生的，不会断开。

I/WifiHAL (28360): event received NL80211_CMD_ROAM, vendor_id = 0x0

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-CONNECTED - Connection to c4:14:3c:29:47:25 completed [id=0 id_str=]

I/WifiHAL (28360): event received NL80211_CMD_ROAM, vendor_id = 0x0

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-CONNECTED - Connection to c4:14:3c:29:47:05 completed [id=0 id_str=]

I/WifiHAL (28360): event received NL80211_CMD_ROAM, vendor_id = 0x0

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-CONNECTED - Connection to 1c:1d:86:e9:e2:85 completed [id=0 id_str=]

6 在打开auoto join的情况下，也会发生roam，也不会断开

E/WifiStateMachine(28360): WifiStateMachine shouldSwitchNetwork txSuccessRate=0.00 rxSuccessRate=0.00 delta 1000 -> 1000

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-CONNECTED - Connection to 6c:99:89:b0:01:85 completed [id=0 id_str=]

I/wpa_supplicant(28064): wlan0: CTRL-EVENT-DISCONNECTED bssid=6c:99:89:b0:01:85 reason=0

E/WifiStateMachine(28360): WifiStateMachine shouldSwitchNetwork txSuccessRate=0.00 rxSuccessRate=0.00 delta 1000 -> 1000

7 802.11 Association Status Codes

Code 802.11

definition

Explanation

0

Successful

1

Unspecified failure

For example : when there is no ssid specified in an association request

10

Cannot support all requested capabilities in the Capability Information field

Example Test: Reject when privacy bit is set for WLAN not requiring security

11

Reassociation denied due to inability to confirm that association exists

NOT SUPPORTED

12

Association denied due to reason outside the scope of this standard

Example : When controller receives assoc from an unknown or disabled SSID

13

Responding station does not support the specified authentication algorithm

For example, MFP is disabled but was requested by the client.

14

Received an Authentication frame with authentication transaction sequence number out of expected sequence

If the authentication sequence number is not correct.

15

Authentication rejected because of challenge failure

16

Authentication rejected due to timeout waiting for next frame in sequence

17

Association denied because AP is unable to handle additional associated stations

Will happen if you run out of AIDs on the AP; so try associating a large number of stations.

18

Association denied due to requesting station not supporting all of the data rates in the BSSBasicRateSet parameter

Will happen if the rates in the assoc request are not in the BasicRateSet in the beacon.

19

Association denied due to requesting station not supporting the short preamble option

NOT SUPPORTED

20

Association denied due to requesting station not supporting the PBCC modulation

option

NOT SUPPORTED

21

Association denied due to requesting station not supporting the Channel Agility option

NOT SUPPORTED

22

Association request rejected because Spectrum Management capability is required

NOT SUPPORTED

23

Association request rejected because the information in the Power Capability element is unacceptable

NOT SUPPORTED

24

Association request rejected because the information in the Supported Channels element is unacceptable

NOT SUPPORTED

25

Association denied due to requesting station not supporting the Short Slot Time option

NOT SUPPORTED

26

Association denied due to requesting station not supporting the DSSS-OFDM option

NOT SUPPORTED

27-31

Reserved

NOT SUPPORTED

32

Unspecified, QoS-related failure

NOT SUPPORTED

33

Association denied because QAP has insufficient bandwidth to handle another QSTA

NOT SUPPORTED

34

Association denied due to excessive frame loss rates and/or poor conditions on current operating channel

NOT SUPPORTED

35

Association (with QBSS) denied because the requesting STA does not support the QoS facility

If the WMM is required by the WLAN and the client is not capable of it, the association will get rejected.

36

Reserved in 802.11

This is used in our code ! There is no blackbox test for this status code.

37

The request has been declined

This is not used in assoc response; ignore

38

The request has not been successful as one or more parameters have invalid values

NOT SUPPORTED

39

The TS has not been created because the request cannot be honored; however, a suggested TSPEC is provided so that the initiating QSTA may attempt to set another TS with the suggested changes to the TSPEC

NOT SUPPORTED

40

Invalid information element, i.e., an information element defined in this standard for which the content does not meet the specifications in Clause 7

Sent when Aironet IE is not present for a CKIP WLAN

41

Invalid group cipher

Used when received unsupported Multicast 802.11i OUI Code

42

Invalid pairwise cipher

43

Invalid AKMP

44

Unsupported RSN information element version

If you put anything but version value of 1, you will see this code.

45

Invalid RSN information element capabilities

If WPA/RSN IE is malformed, such as incorrect length etc, you will see this code.

46

Cipher suite rejected because of security policy

NOT SUPPORTED

47

The TS has not been created; however, the HC may be capable of creating a TS, in response to a request, after the time indicated in the TS Delay element

NOT SUPPORTED

48

Direct link is not allowed in the BSS by policy

NOT SUPPORTED

49

Destination STA is not present within this QBSS

NOT SUPPORTED

50

The Destination STA is not a QSTA

NOT SUPPORTED

51

Association denied because the ListenInterval is too large

NOT SUPPORTED

200(0xC8)

Unspecified, QoS-related failure. Not defined in IEEE, defined in CCXv4

Unspecified QoS Failure. This will happen if the Assoc request contains more than one TSPEC for the same AC.

201(0xC9)

TSPEC request refused due to AP’s policy configuration (e.g., AP is configured to deny all TSPEC requests on this SSID). A TSPEC will not be suggested by the AP for this reason code. Not defined in IEEE, defined in CCXv4

This will happen if a TSPEC comes to a WLAN which has lower priority than the WLAN priority settings. For example a Voice TSPEC coming to a Silver WLAN. Only applies to CCXv4 clients.

202(0xCA)

Association Denied due to AP having insufficient bandwidth to handle a new TS. This cause code will be useful while roaming only. Not defined in IEEE, defined in CCXv4

203(0xCB)

Invalid Parameters. The request has not been successful as one or more TSPEC parameters in the request have invalid values. A TSPEC SHALL be present in the response as a suggestion. Not defined in IEEE, defined in CCXv4

This happens in cases such as PHY rate mismatch. If the TSRS IE contains a phy rate not supported by the controller, for example. Other examples include sending a TSPEC with bad parameters, such as sending a date rate of 85K for a narrowband TSPEC.

802.11 Deauth Reason Codes

When running a client debug, this code will match the ReasonCode from the output: "Scheduling mobile for deletion with delete Reason x, reasonCode y"

Code

802.11 definition

Explanation

0

Reserved

NOT SUPPORTED

1

Unspecified reason

TBD

2

Previous authentication no longer valid

NOT SUPPORTED

3

station is leaving (or has left) IBSS or ESS

NOT SUPPORTED

4

Disassociated due to inactivity

Do not send any data after association;

5

Disassociated because AP is unable to handle all currently associated stations

TBD

6

Class 2 frame received from nonauthenticated station

NOT SUPPORTED

7

Class 3 frame received from nonassociated station

NOT SUPPORTED

8

Disassociated because sending station is leaving (or has left) BSS

TBD

9

Station requesting (re)association is not authenticated with responding station

NOT SUPPORTED

10

Disassociated because the information in the Power Capability element is unacceptable

NOT SUPPORTED

11

Disassociated because the information in the Supported Channels element is unacceptable

NOT SUPPORTED

12

Reserved

NOT SUPPORTED

13

Invalid information element, i.e., an information element defined in this standard for which the content does not meet the specifications in Clause 7

NOT SUPPORTED

14

Message integrity code (MIC) failure

NOT SUPPORTED

15

4-Way Handshake timeout

NOT SUPPORTED

16

Group Key Handshake timeout

NOT SUPPORTED

17

Information element in 4-Way Handshake different from (Re)Association Request/Probe Response/Beacon frame

NOT SUPPORTED

18

Invalid group cipher

NOT SUPPORTED

19

Invalid pairwise cipher

NOT SUPPORTED

20

Invalid AKMP

NOT SUPPORTED

21

Unsupported RSN information element version

NOT SUPPORTED

22

Invalid RSN information element capabilities

NOT SUPPORTED

23

IEEE 802.1X authentication failed

NOT SUPPORTED

24

Cipher suite rejected because of the security policy

NOT SUPPORTED

25-31

Reserved

NOT SUPPORTED

32

Disassociated for unspecified, QoS-related reason

NOT SUPPORTED

33

Disassociated because QAP lacks sufficient bandwidth for this QSTA

NOT SUPPORTED

34

Disassociated because excessive number of frames need to be acknowledged, but are not acknowledged due to AP transmissions and/or poor channel conditions

NOT SUPPORTED

35

Disassociated because QSTA is transmitting outside the limits of its TXOPs

NOT SUPPORTED

36

Requested from peer QSTA as the QSTA is leaving the QBSS (or resetting)

NOT SUPPORTED

37

Requested from peer QSTA as it does not want to use the mechanism

NOT SUPPORTED

38

Requested from peer QSTA as the QSTA received frames using the mechanism for which a setup is required

NOT SUPPORTED

39

Requested from peer QSTA due to timeout

NOT SUPPORTED

40

Peer QSTA does not support the requested cipher suite

NOT SUPPORTED

46-65535

46--65 535 Reserved

NOT SUPPORTED

98

Cisco defined

TBD

99

Cisco defined Used when the reason code sent in a deassoc req or deauth by the client is invalid – invalid length, invalid value etc

Example: Send a Deauth to the AP with the reason code to be invalid, say zero

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