介绍主动扫描，被动扫描以及连接的wifi的扫描过程
参考文档
《802.11无线网络权威指南》
《80_Y0513_1_QCA_WCN36X0_SOFTWARE_ARCHITECTURE.pdf》(高通文档)
被动扫描（passive scanning）
可以节省电池的电力，因为不需要传送任何信号。在被动
扫描中，工作站会在频道表（channel list）所列的各个频道之间不断切换，并静候Beacon 帧
的到来。所收到的任何帧都会被暂存起来，以便取出传送这些帧之BSS 的相关数据。
作被动扫描的过程中，工作站会在频道间不断切换，并且会记录来自所收到之Beacon 信息
的信息。Beacon 在设计上是为了让工作站得知，加入某个基本服务组合（basic service set，
简称BSS）所需要的参数，以便进行通讯。
主动扫描（active scanning）
在主动扫描中，工作站扮演比较积极的角色。在每个频道上，工作站
都会岭出Probe Request 帧，请求某个特定网络予以回应。主动扫描系主动试图寻找网络，而不
是听候网络宣告本身的存在。使用主动扫描的工作站将会以如下的程序扫描频道表所列的频道：
1.跳至某个频道，然后等候来讯显示，或者等到ProbeDelay 计时器逾时。如果在这个频道收得到帧，就证明该频道有人使用，因此可以加以探
测。此计时器用来防止某个闲置频道让整个程序停摆；工作站不会一直听候帧到来。
2.利用基本的DCF 访问程序取得介质使用权，然后送出一个Probe Request 帧。
3.至少等候一段最短的频道时间（即MinChannelTime）。
a.如果介质并不忙碌，表示没有网络存在。因此可以跳至下个频道。
b.如果在MinChannelTime 这段期间介质非常忙碌，就继续等候一段时间，直 到
最长的频道时间（即MaxChannelTime），然后处理任何的Probe Response 帧。
当网络收到搜寻其所属之延伸服务组合的Probe Request（探查要求），就会发出Probe
Response（探查回应）帧。为了在舞会中找到朋友，各位或许会绕著舞池大声叫喊对方的名字。
（虽然这并不礼貌，不过如果真想找到朋友，大概没有其他选择。）如果对方听见了，她就会出
声回应，至于其他人根本就不会理你（希望如此）。Probe Request 框的作用类似，不过在Probe
Request 帧当中可以使用broadcast SSID，如此一来，该区所有的802.11 网络都会以Probe
Response 加以回应。
probe request两种情况的不同
指定SSID
SSID为空(broadcast)
kernel扫描日志
主动扫描
18:49:39.864678 [18:49:39.858008] [00000016B70D009C] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS PE MC Message queue
18:49:39.864704 [18:49:39.858079] [00000016B70D05E4] [VosMC] wlan: [I :PE ] limContinuePostChannelScan: 477: Mac Addr da:a1:19:53:b9:f8 used in sending ProbeReq number 0, for SSID on channel: 2
18:49:39.864726 [18:49:39.858146] [00000016B70D0AEA] [VosMC] wlan: [I :VOS] VPKT [779]: [0000000000000000] Packet allocated, type 0[TX_802_11_MGMT]
18:49:39.864748 [18:49:39.858193] [00000016B70D0E76] [VosMC] wlan: [IH:WDA] Tx Mgmt Frame Subtype: 4 alloc(0000000000000000) txBdToken = 0
18:49:39.864770 [18:49:39.858221] [00000016B70D108F] [VosMC] wlan: [I :TL ] TL: using self sta addr to get staidx for spoofed probe req 00:0a:f5:32:b1:50
18:49:39.864792 [18:49:39.858237] [00000016B70D11BE] [VosMC] wlan: [IL:TL ] WLAN TL: fProtMgmtFrame:0
18:49:39.864814 [18:49:39.858256] [00000016B70D132A] [VosMC] wlan: [IL:TL ] WLAN TL: Dump TX meta info: txFlags:2, qosEnabled:0, ac:0, isEapol:0, fdisableFrmXlt:1, frmType:0
18:49:39.864836 [18:49:39.858269] [00000016B70D142E] [VosMC] wlan: [IH:TL ] Serializing WDA TX Start Xmit event
18:49:39.866943 [18:49:39.858720] [00000016B70D360E] [VosTX] wlan: [I :VOS] VosTXThread: Servicing the VOS TL TX Message queue
18:49:39.866992 [18:49:39.858916] [00000016B70D44B8] [VosTX] wlan: [I :WDI] WDTS_TxPacketComplete: Management frame Tx complete status: 0
18:49:39.867015 [18:49:39.858934] [00000016B70D4604] [VosTX] wlan: [I :WDA] Enter:WDA_TxComplete
18:49:39.867037 [18:49:39.858955] [00000016B70D4795] [VosTX] wlan: [I :VOS] VPKT [1428]: [0000000000000000] Packet returned, type 0[TX_802_11_MGMT]
18:49:39.867059 [18:49:39.859423] [00000016B70D6AB7] [VosMC] wlan: [I :SYS] tx_timer_deactivate() called for timer MIN CHANNEL TIMEOUT
18:49:39.867098 [18:49:39.859437] [00000016B70D6BBD] [VosMC] wlan: [IH:VOS] vos_timer_stop: Timer Addr inside voss_stop : 0x0000000000000000
18:49:39.867120 [18:49:39.859450] [00000016B70D6CBE] [VosMC] wlan: [IH:VOS] vos_timer_stop: Cannot stop timer in state = 19
18:49:39.867141 [18:49:39.859466] [00000016B70D6DEF] [VosMC] wlan: [I :SYS] Timer MIN CHANNEL TIMEOUT being activated
18:49:39.867180 [18:49:39.859478] [00000016B70D6EDD] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
18:49:39.867201 [18:49:39.859497] [00000016B70D7048] [VosMC] wlan: [I :SYS] Timer MIN CHANNEL TIMEOUT now activated
18:49:39.867240 [18:49:39.859509] [00000016B70D7124] [VosMC] wlan: [I :SYS] tx_timer_deactivate() called for timer MAX CHANNEL TIMEOUT
18:49:39.867279 [18:49:39.859520] [00000016B70D7202] [VosMC] wlan: [IH:VOS] vos_timer_stop: Timer Addr inside voss_stop : 0x0000000000000000
18:49:39.867301 [18:49:39.859532] [00000016B70D72E9] [VosMC] wlan: [IH:VOS] vos_timer_stop: Cannot stop timer in state = 19
18:49:39.867323 [18:49:39.859543] [00000016B70D73BF] [VosMC] wlan: [I :SYS] Timer MAX CHANNEL TIMEOUT being activated
18:49:39.867362 [18:49:39.859554] [00000016B70D748A] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
18:49:39.867405 [18:49:39.859567] [00000016B70D757E] [VosMC] wlan: [I :SYS] Timer MAX CHANNEL TIMEOUT now activated
18:49:39.867446 [18:49:39.859578] [00000016B70D765B] [VosMC] wlan: [I :SYS] tx_timer_deactivate() called for timer Periodic Probe Request Timer
18:49:39.867485 [18:49:39.859589] [00000016B70D7731] [VosMC] wlan: [IH:VOS] vos_timer_stop: Timer Addr inside voss_stop : 0x0000000000000000
18:49:39.867506 [18:49:39.859601] [00000016B70D7816] [VosMC] wlan: [IH:VOS] vos_timer_stop: Cannot stop timer in state = 19
18:49:39.867528 [18:49:39.859614] [00000016B70D7903] [VosMC] wlan: [I :SYS] Timer Periodic Probe Request Timer being activated // 扫描请求定时器
18:49:39.867566 [18:49:39.859624] [00000016B70D79C9] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
18:49:39.867587 [18:49:39.859638] [00000016B70D7AD6] [VosMC] wlan: [I :SYS] Timer Periodic Probe Request Timer now activated
18:49:39.867626 [18:49:39.861202] [00000016B70DF068] [cnss_] wlan: [I :HDD] __wlan_hdd_cfg80211_get_wifi_info: 6759: Rcvd req for FW version FW version is CNSS-PR-4-0-509-158621-1
18:49:39.867647 [18:49:39.861722] [00000016B70E1739] [swapp] wlan: [I :VOS] TIMER callback: running on MC thread
18:49:39.867668 [18:49:39.861831] [00000016B70E1F55] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS SYS MC Message queue
18:49:39.867689 [18:49:39.861850] [00000016B70E20B7] [VosMC] wlan: [I :SYS] Timer Periodic Probe Request Timer triggered // 超时处理
18:49:39.867711 [18:49:39.861874] [00000016B70E2291] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS PE MC Message queue
18:49:39.867733 [18:49:39.861917] [00000016B70E25C3] [VosMC] wlan: [I :PE ] limProcessPeriodicProbeReqTimer: 4237: Mac Addr used in Probe Req is :da:a1:19:53:b9:f8
18:49:39.867755 [18:49:39.861994] [00000016B70E2B8E] [VosMC] wlan: [I :VOS] VPKT [779]: [0000000000000000] Packet allocated, type 0[TX_802_11_MGMT]
18:49:39.867776 [18:49:39.862042] [00000016B70E2F1F] [VosMC] wlan: [IH:WDA] Tx Mgmt Frame Subtype: 4 alloc(0000000000000000) txBdToken = 0
18:49:39.867799 [18:49:39.862070] [00000016B70E3141] [VosMC] wlan: [I :TL ] TL: using self sta addr to get staidx for spoofed probe req 00:0a:f5:32:b1:50
18:49:39.867820 [18:49:39.862086] [00000016B70E3278] [VosMC] wlan: [IL:TL ] WLAN TL: fProtMgmtFrame:0
18:49:39.867842 [18:49:39.862105] [00000016B70E33DB] [VosMC] wlan: [IL:TL ] WLAN TL: Dump TX meta info: txFlags:2, qosEnabled:0, ac:0, isEapol:0, fdisableFrmXlt:1, frmType:0
18:49:39.867863 [18:49:39.862118] [00000016B70E34DB] [VosMC] wlan: [IH:TL ] Serializing WDA TX Start Xmit event
18:49:39.867884 [18:49:39.862200] [00000016B70E3AFD] [VosTX] wlan: [I :VOS] VosTXThread: Servicing the VOS TL TX Message queue
18:49:39.875713 [18:49:39.862463] [00000016B70E4EBF] [VosTX] wlan: [I :WDI] WDTS_TxPacketComplete: Management frame Tx complete status: 0
18:49:39.875783 [18:49:39.862521] [00000016B70E5313] [VosTX] wlan: [I :WDA] Enter:WDA_TxComplete
18:49:39.875807 [18:49:39.862545] [00000016B70E54D5] [VosTX] wlan: [I :VOS] VPKT [1428]: [0000000000000000] Packet returned, type 0[TX_802_11_MGMT]
18:49:39.875829 [18:49:39.863277] [00000016B70E8BD9] [VosMC] wlan: [I :SYS] Timer Periodic Probe Request Timer being activated
18:49:39.875868 [18:49:39.863295] [00000016B70E8D1A] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
18:49:39.875890 [18:49:39.863315] [00000016B70E8E94] [VosMC] wlan: [I :SYS] Timer Periodic Probe Request Timer now activated
18:49:39.875929 [18:49:39.863568] [00000016B70EA19D] [VosRX] wlan: [I :VOS] VPKT [779]: [0000000000000000] Packet allocated, type 3[RX_RAW]
18:49:39.875951 [18:49:39.864074] [00000016B70EC78E] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS PE MC Message queue
18:49:39.875974 [18:49:39.864119] [00000016B70ECAE9] [VosMC] wlan: [I :PE ] limHandle80211Frames: 821: RX MGMT - Type 0, SubType 5,Seq.no 1927, Source mac-addr a0:04:60:8e:cf:8b
被动扫描
13:51:17.028054 [13:51:16.916323] [0000000114D926EF] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS PE MC Message queue
13:51:17.028076 [13:51:16.916373] [0000000114D92AC0] [VosMC] wlan: [I :PE ] limContinueChannelScan: 1390: Current Channel to be scanned is 64
13:51:17.028099 [13:51:16.916372] [0000000114D92AB3] [cnss_] wlan: [I :HDD] __wlan_hdd_cfg80211_get_wifi_info: 6759: Rcvd req for FW version FW version is CNSS-PR-4-0-509-158621-1
13:51:17.028122 [13:51:16.916407] [0000000114D92D3D] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS WDA MC Message queue
13:51:17.028144 [13:51:16.916423] [0000000114D92E71] [VosMC] wlan: [IL:WDA] =========> WDA_McProcessMsg msgType: 1037
13:51:17.029844 [13:51:16.916450] [0000000114D93077] [VosMC] wlan: [I :WDA] ------> WDA_ProcessStartScanReq
13:51:17.029880 [13:51:16.916557] [0000000114D9387D] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
13:51:17.029903 [13:51:16.923382] [0000000114DB38AE] [swapp] wlan: [I :VOS] TIMER callback: running on MC thread
13:51:17.029926 [13:51:16.923894] [0000000114DB5ECB] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS SYS MC Message queue
13:51:17.029971 [13:51:16.923929] [0000000114DB6168] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
13:51:17.029996 [13:51:16.927976] [0000000114DC9127] [VosMC] wlan: [IH:VOS] vos_timer_stop: Timer Addr inside voss_stop : 0x0000000000000000
13:51:17.030018 [13:51:16.928019] [0000000114DC9431] [VosMC] wlan: [I :WDA] <------ WDA_StartScanReqCallback
13:51:17.030040 [13:51:16.928112] [0000000114DC9B29] [VosMC] wlan: [IH:VOS] vos_list_remove_front: list empty
13:51:17.030062 [13:51:16.928147] [0000000114DC9DC0] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS PE MC Message queue
13:51:17.030085 [13:51:16.928207] [0000000114DCA240] [VosMC] wlan: [I :PE ] limContinuePostChannelScan: 575: START PASSIVE Scan chan 64
13:51:17.030107 [13:51:16.928220] [0000000114DCA339] [VosMC] wlan: [I :SYS] tx_timer_deactivate() called for timer MAX CHANNEL TIMEOUT
13:51:17.030148 [13:51:16.928232] [0000000114DCA41D] [VosMC] wlan: [IH:VOS] vos_timer_stop: Timer Addr inside voss_stop : 0x0000000000000000
13:51:17.030170 [13:51:16.928244] [0000000114DCA50A] [VosMC] wlan: [IH:VOS] vos_timer_stop: Cannot stop timer in state = 19
13:51:17.030193 [13:51:16.928261] [0000000114DCA65A] [VosMC] wlan: [I :SYS] Timer MAX CHANNEL TIMEOUT being activated
13:51:17.030233 [13:51:16.928273] [0000000114DCA73C] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
13:51:17.030256 [13:51:16.928295] [0000000114DCA8DF] [VosMC] wlan: [I :SYS] Timer MAX CHANNEL TIMEOUT now activated
13:51:17.030296 [13:51:16.973733] [0000000114E9F8F8] [swapp] wlan: [I :VOS] TIMER callback: running on MC thread
13:51:17.030318 [13:51:16.974113] [0000000114EA154D] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS SYS MC Message queue
13:51:17.030341 [13:51:16.974148] [0000000114EA17D1] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
13:51:17.061520 [13:51:17.024632] [0000000114F8E270] [swapp] wlan: [I :VOS] TIMER callback: running on MC thread
13:51:17.061598 [13:51:17.024869] [0000000114F8F3E7] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS SYS MC Message queue
13:51:17.061623 [13:51:17.024903] [0000000114F8F67C] [VosMC] wlan: [IH:VOS] Timer Addr inside voss_start : 0x0000000000000000
13:51:17.061647 [13:51:17.026933] [0000000114F98F03] [cnss_] wlan: [I :HDD] __wlan_hdd_cfg80211_get_wifi_info: 6759: Rcvd req for FW version FW version is CNSS-PR-4-0-509-158621-1
13:51:17.061671 [13:51:17.033122] [0000000114FB5F31] [swapp] wlan: [I :VOS] TIMER callback: running on MC thread
13:51:17.061694 [13:51:17.033292] [0000000114FB6BA3] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS SYS MC Message queue
13:51:17.061716 [13:51:17.033311] [0000000114FB6D0E] [VosMC] wlan: [I :SYS] Timer MAX CHANNEL TIMEOUT triggered
13:51:17.061739 [13:51:17.033337] [0000000114FB6F05] [VosMC] wlan: [I :VOS] VosMCThread: Servicing the VOS PE MC Message queue
13:51:17.061762 [13:51:17.033368] [0000000114FB714E] [VosMC] wlan: [I :PE ] limProcessMaxChannelTimeout: 4127: Scanning : Max channel timed out
13:51:17.061784 [13:51:17.033382] [0000000114FB7262] [VosMC] wlan: [I :SYS] tx_timer_deactivate() called for timer MAX CHANNEL TIMEOUT
13:51:17.061825 [13:51:17.033399] [0000000114FB73AE] [VosMC] wlan: [IH:VOS] vos_timer_stop: Timer Addr inside voss_stop : 0x0000000000000000
13:51:17.061846 [13:51:17.033412] [0000000114FB749F] [VosMC] wlan: [IH:VOS] vos_timer_stop: Cannot stop timer in state = 19
13:51:17.061869 [13:51:17.033427] [0000000114FB75C9] [VosMC] wlan: [I :SYS] tx_timer_deactivate() called for timer Periodic Probe Request Timer
13:51:17.061909 [13:51:17.033438] [0000000114FB769F] [VosMC] wlan: [IH:VOS] vos_timer_stop: Timer Addr inside voss_stop : 0x0000000000000000
13:51:17.061931 [13:51:17.033450] [0000000114FB7783] [VosMC] wlan: [IH:VOS] vos_timer_stop: Cannot stop timer in state = 19
13:51:17.061955 [13:51:17.033468] [0000000114FB78D4] [VosMC] wlan: [W :PE ] limProcessMaxChannelTimeout: 4154: Sending End Scan req from MAX_CH_TIMEOUT in state 2 on ch-64
kernel代码分析
驱动模块初始化函数
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\HDD\\src\\wlan_hdd_main.c
static int hdd_driver_init( void)
vendor\\qcom\\opensource\\wlan\\qcacld-2.0\\CORE\\HDD\\src\\wlan_hdd_main.c
int hdd_wlan_startup(struct device *dev, v_VOID_t *hif_sc)
status = vos_open( &pVosContext, 0);
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\VOSS\\src\\vos_api.c
VOS_STATUS vos_open( v_CONTEXT_t *pVosContext, void *devHandle )
其中开启线程
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\VOSS\\src\\vos_sched.c
VOS_STATUS
vos_sched_open()
{
// 创建线程
//Create the VOSS Main Controller thread
pSchedContext->McThread = kthread_create(VosMCThread, pSchedContext,
"VosMCThread");
}
// 线程函数
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMlmReqMessages.c
static int
VosMCThread
(
void * Arg
)
{
set_user_nice(current, -2);
while(!shutdown)
{
// This implements the execution model algorithm
retWaitStatus = wait_event_interruptible(pSchedContext->mcWaitQueue,
test_bit(MC_POST_EVENT, &pSchedContext->mcEventFlag) ||
test_bit(MC_SUSPEND_EVENT, &pSchedContext->mcEventFlag));
if(retWaitStatus == -ERESTARTSYS)
{
VOS_TRACE(VOS_MODULE_ID_VOSS, VOS_TRACE_LEVEL_ERROR,
"%s: wait_event_interruptible returned -ERESTARTSYS", __func__);
break;
}
clear_bit(MC_POST_EVENT, &pSchedContext->mcEventFlag);
// 循环
while(1)
{
// Check if MC needs to shutdown
if(test_bit(MC_SHUTDOWN_EVENT, &pSchedContext->mcEventFlag))
{
VOS_TRACE(VOS_MODULE_ID_VOSS, VOS_TRACE_LEVEL_INFO,
"%s: MC thread signaled to shutdown", __func__);
shutdown = VOS_TRUE;
/* Check for any Suspend Indication */
if (test_and_clear_bit(MC_SUSPEND_EVENT,
&pSchedContext->mcEventFlag))
{
/* Unblock anyone waiting on suspend */
complete(&pHddCtx->mc_sus_event_var);
}
break;
}
// while循环中处理各种消息
vStatus = WDA_McProcessMsg( pSchedContext->pVContext, pMsgWrapper->pVosMsg);
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\WDA\\src\\wlan_qct_wda.c
VOS_STATUS WDA_McProcessMsg( v_CONTEXT_t pVosContext, vos_msg_t *pMsg )
{
/* Process all the WDA messages.. */
switch( pMsg->type )
{
// 扫描初始化
case WDA_INIT_SCAN_REQ:
{
WDA_ProcessInitScanReq(pWDA, (tInitScanParams *)pMsg->bodyptr) ;
break ;
}
/* start SCAN request from PE */
case WDA_START_SCAN_REQ: // 扫描
{
WDA_ProcessStartScanReq(pWDA, (tStartScanParams *)pMsg->bodyptr) ;
break ;
}
// 开始扫描请求
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\WDA\\src\\wlan_qct_wda.c
VOS_STATUS WDA_ProcessStartScanReq(tWDA_CbContext *pWDA,
tStartScanParams *startScanParams)
{
// 开始扫描, 使用回调函数,调用WDA_StartScanReqCallback.
status = WDI_StartScanReq(wdiStartScanParams,
WDA_StartScanReqCallback, pWdaParams) ;
/* failure returned by WDI API */
if(IS_WDI_STATUS_FAILURE(status))
{
VOS_TRACE( VOS_MODULE_ID_WDA, VOS_TRACE_LEVEL_ERROR,
"Failure in Start Scan WDI API, free all the memory "
"It should be due to previous abort scan." );
vos_mem_free(pWdaParams->wdaWdiApiMsgParam);
vos_mem_free(pWdaParams) ;
startScanParams->status = eSIR_FAILURE ;
WDA_SendMsg(pWDA, WDA_START_SCAN_RSP, (void *)startScanParams, 0) ;
}
return CONVERT_WDI2VOS_STATUS(status) ;
}
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\WDA\\src\\wlan_qct_wda.c
void WDA_StartScanReqCallback(WDI_StartScanRspParamsType *pScanRsp,
void* pUserData)
{
// 发送WDA_START_SCAN_RSP消息
/* assign status to scan params */
pWDA_ScanParam->status = pScanRsp->wdiStatus ;
/* send SCAN RSP message back to PE */
WDA_SendMsg(pWDA, WDA_START_SCAN_RSP, (void *)pWDA_ScanParam, 0) ;
return ;
}
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMessageQueue.c
void
limProcessMessages(tpAniSirGlobal pMac, tpSirMsgQ limMsg)
{
case SIR_LIM_UPDATE_BEACON:
limUpdateBeacon(pMac); // 更新beacon
break;
case WDA_INIT_SCAN_RSP:
limProcessInitScanRsp(pMac, limMsg->bodyptr);
limMsg->bodyptr = NULL;
break;
case WDA_START_SCAN_RSP: // 处理消息
limProcessStartScanRsp(pMac, limMsg->bodyptr);
limMsg->bodyptr = NULL;
break;
// beacon处理函数。
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limUtils.c
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMlmRspMessages.c
void limProcessStartScanRsp(tpAniSirGlobal pMac, void *body)
{
tpStartScanParams pStartScanParam;
eHalStatus status;
SET_LIM_PROCESS_DEFD_MESGS(pMac, true);
pStartScanParam = (tpStartScanParams) body;
status = pStartScanParam->status;
#if defined WLAN_FEATURE_VOWIFI
//HAL fills in the tx power used for mgmt frames in this field.
//Store this value to use in TPC report IE.
rrmCacheMgmtTxPower( pMac, pStartScanParam->txMgmtPower, NULL );
//Store start TSF of scan start. This will be stored in BSS params.
rrmUpdateStartTSF( pMac, pStartScanParam->startTSF );
#endif
vos_mem_free(body);
body = NULL;
if( pMac->lim.abortScan )
{
limLog( pMac, LOGW, FL(" finish scan") );
pMac->lim.abortScan = 0;
limDeactivateAndChangeTimer(pMac, eLIM_MIN_CHANNEL_TIMER);
limDeactivateAndChangeTimer(pMac, eLIM_MAX_CHANNEL_TIMER);
//Set the resume channel to Any valid channel (invalid).
//This will instruct HAL to set it to any previous valid channel.
peSetResumeChannel(pMac, 0, 0);
limSendHalFinishScanReq(pMac, eLIM_HAL_FINISH_SCAN_WAIT_STATE);
}
switch(pMac->lim.gLimHalScanState)
{
case eLIM_HAL_START_SCAN_WAIT_STATE:
if (status != (tANI_U32) eHAL_STATUS_SUCCESS)
{
PELOGW(limLog(pMac, LOGW, FL("StartScanRsp with failed status= %d"), status);)
//
// FIXME - With this, LIM will try and recover state, but
// eWNI_SME_SCAN_CNF maybe reporting an incorrect
// status back to the SME
//
//Set the resume channel to Any valid channel (invalid).
//This will instruct HAL to set it to any previous valid channel.
peSetResumeChannel(pMac, 0, 0);
limSendHalFinishScanReq( pMac, eLIM_HAL_FINISH_SCAN_WAIT_STATE );
//limCompleteMlmScan(pMac, eSIR_SME_HAL_SCAN_INIT_FAILED);
}
else
{
pMac->lim.gLimHalScanState = eLIM_HAL_SCANNING_STATE;
limContinuePostChannelScan(pMac); // 扫描
}
break;
default:
limLog(pMac, LOGW, FL("Rcvd StartScanRsp not in WAIT State, state %d"),
pMac->lim.gLimHalScanState);
break;
}
return;
}
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMlmReqMessages.c
void limContinuePostChannelScan(tpAniSirGlobal pMac)
{
// 开始扫描
do
{
tSirMacAddr gSelfMacAddr;
/* Send self MAC as src address if
* MAC spoof is not enabled OR
* spoofMacAddr is all 0 OR
* disableP2PMacSpoof is enabled and scan is P2P scan
* else use the spoofMac as src address
*/
if ((pMac->lim.isSpoofingEnabled != TRUE) ||
(TRUE ==
vos_is_macaddr_zero((v_MACADDR_t *)&pMac->lim.spoofMacAddr)) ||
(pMac->roam.configParam.disableP2PMacSpoofing &&
pMac->lim.gpLimMlmScanReq->p2pSearch)) {
vos_mem_copy(gSelfMacAddr, pMac->lim.gSelfMacAddr, VOS_MAC_ADDRESS_LEN);
} else {
vos_mem_copy(gSelfMacAddr, pMac->lim.spoofMacAddr, VOS_MAC_ADDRESS_LEN);
}
limLog(pMac, LOG1,
FL(" Mac Addr "MAC_ADDRESS_STR " used in sending ProbeReq number %d, for SSID %s on channel: %d"),
MAC_ADDR_ARRAY(gSelfMacAddr) ,i, pMac->lim.gpLimMlmScanReq->ssId[i].ssId, channelNum);
// include additional IE if there is
// 发出probe request数据帧，主动扫描
status = limSendProbeReqMgmtFrame( pMac, &pMac->lim.gpLimMlmScanReq->ssId[i],
pMac->lim.gpLimMlmScanReq->bssId, channelNum, gSelfMacAddr,
pMac->lim.gpLimMlmScanReq->dot11mode,
pMac->lim.gpLimMlmScanReq->uIEFieldLen,
(tANI_U8 *)(pMac->lim.gpLimMlmScanReq)+pMac->lim.gpLimMlmScanReq->uIEFieldOffset);
if ( status != eSIR_SUCCESS)
{
PELOGE(limLog(pMac, LOGE, FL("send ProbeReq failed for SSID %s on channel: %d"),
pMac->lim.gpLimMlmScanReq->ssId[i].ssId, channelNum);)
limDeactivateAndChangeTimer(pMac, eLIM_MIN_CHANNEL_TIMER);
limSendHalEndScanReq(pMac, channelNum, eLIM_HAL_END_SCAN_WAIT_STATE);
return;
}
i++;
} while (i < pMac->lim.gpLimMlmScanReq->numSsid);
else
{
tANI_U32 val;
// 被动扫描
limLog(pMac, LOG1, FL("START PASSIVE Scan chan %d"), channelNum);
/// Passive Scanning. Activate maxChannelTimer
if (tx_timer_deactivate(&pMac->lim.limTimers.gLimMaxChannelTimer) // 定时器, 信道停留最大时间
!= TX_SUCCESS)
{
// Could not deactivate max channel timer.
// Log error
limLog(pMac, LOGE, FL("Unable to deactivate max channel timer"));
limSendHalEndScanReq(pMac, channelNum,
eLIM_HAL_END_SCAN_WAIT_STATE);
}
else
{
if (pMac->miracast_mode)
{
val = DEFAULT_MIN_CHAN_TIME_DURING_MIRACAST +
DEFAULT_MAX_CHAN_TIME_DURING_MIRACAST;
}
else if (wlan_cfgGetInt(pMac, WNI_CFG_PASSIVE_MAXIMUM_CHANNEL_TIME,
&val) != eSIR_SUCCESS)
{
/**
* Could not get max channel value
* from CFG. Log error.
*/
limLog(pMac, LOGE,
FL("could not retrieve passive max chan value, Use Def val"));
val= WNI_CFG_PASSIVE_MAXIMUM_CHANNEL_TIME_STADEF;
}
val = SYS_MS_TO_TICKS(val);
// 重新设置定时器
if (tx_timer_change(&pMac->lim.limTimers.gLimMaxChannelTimer,
val, 0) != TX_SUCCESS)
{
// Could not change max channel timer.
// Log error
limLog(pMac, LOGE, FL("Unable to change max channel timer"));
limDeactivateAndChangeTimer(pMac, eLIM_MAX_CHANNEL_TIMER);
limSendHalEndScanReq(pMac, channelNum,
eLIM_HAL_END_SCAN_WAIT_STATE);
return;
}
else if (tx_timer_activate(&pMac->lim.limTimers.gLimMaxChannelTimer)
!= TX_SUCCESS)
{
limLog(pMac, LOGE, FL("could not start max channel timer"));
limDeactivateAndChangeTimer(pMac, eLIM_MAX_CHANNEL_TIMER);
limSendHalEndScanReq(pMac, channelNum,
eLIM_HAL_END_SCAN_WAIT_STATE);
return;
}
}
// Wait for Beacons to arrive
} // if (pMac->lim.gLimMlmScanReq->scanType == eSIR_ACTIVE_SCAN)
limAddScanChannelInfo(pMac, channelNum);
return;
}
probe request位置
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limSendManagementFrames.c
停止定时器处理函数
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\SYS\\legacy\\src\\platform\\src\\VossWrapper.c
超时处理函数, 代码中可以看到，好多超时用的都是同一个函数
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMessageQueue.c
void
limProcessMessages(tpAniSirGlobal pMac, tpSirMsgQ limMsg)
case SIR_LIM_MIN_CHANNEL_TIMEOUT:
case SIR_LIM_MAX_CHANNEL_TIMEOUT:
case SIR_LIM_PERIODIC_PROBE_REQ_TIMEOUT:
case SIR_LIM_JOIN_FAIL_TIMEOUT:
case SIR_LIM_PERIODIC_JOIN_PROBE_REQ_TIMEOUT:
case SIR_LIM_AUTH_FAIL_TIMEOUT:
case SIR_LIM_AUTH_RSP_TIMEOUT:
case SIR_LIM_ASSOC_FAIL_TIMEOUT:
case SIR_LIM_REASSOC_FAIL_TIMEOUT:
#ifdef WLAN_FEATURE_VOWIFI_11R
case SIR_LIM_FT_PREAUTH_RSP_TIMEOUT:
#endif
case SIR_LIM_REMAIN_CHN_TIMEOUT:
case SIR_LIM_INSERT_SINGLESHOT_NOA_TIMEOUT:
case SIR_LIM_DISASSOC_ACK_TIMEOUT:
case SIR_LIM_DEAUTH_ACK_TIMEOUT:
case SIR_LIM_CONVERT_ACTIVE_CHANNEL_TO_PASSIVE:
case SIR_LIM_AUTH_RETRY_TIMEOUT:
case SIR_LIM_SAP_ECSA_TIMEOUT:
#ifdef WLAN_FEATURE_LFR_MBB
case SIR_LIM_PREAUTH_MBB_RSP_TIMEOUT:
case SIR_LIM_REASSOC_MBB_RSP_TIMEOUT:
#endif
// These timeout messages are handled by MLM sub module
limProcessMlmReqMessages(pMac,
limMsg);
break;
}
不同消息函数处理
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMlmReqMessages.c
void
limProcessMlmReqMessages(tpAniSirGlobal pMac, tpSirMsgQ Msg)
{
switch (Msg->type)
{
case LIM_MLM_START_REQ: limProcessMlmStartReq(pMac, Msg->bodyptr); break;
case LIM_MLM_SCAN_REQ: limProcessMlmScanReq(pMac, Msg->bodyptr); break;
#ifdef FEATURE_OEM_DATA_SUPPORT
case LIM_MLM_OEM_DATA_REQ: limProcessMlmOemDataReq(pMac, Msg->bodyptr); break;
#endif
case LIM_MLM_JOIN_REQ: limProcessMlmJoinReq(pMac, Msg->bodyptr); break;
case LIM_MLM_AUTH_REQ: limProcessMlmAuthReq(pMac, Msg->bodyptr); break;
case LIM_MLM_ASSOC_REQ: limProcessMlmAssocReq(pMac, Msg->bodyptr); break;
// 重关联超时
case LIM_MLM_REASSOC_REQ: limProcessMlmReassocReq(pMac, Msg->bodyptr); break;
// 取消关联请求
case LIM_MLM_DISASSOC_REQ: limProcessMlmDisassocReq(pMac, Msg->bodyptr); break;
case LIM_MLM_DEAUTH_REQ: limProcessMlmDeauthReq(pMac, Msg->bodyptr); break;
case LIM_MLM_SETKEYS_REQ: limProcessMlmSetKeysReq(pMac, Msg->bodyptr); break;
case LIM_MLM_REMOVEKEY_REQ: limProcessMlmRemoveKeyReq(pMac, Msg->bodyptr); break;
case SIR_LIM_MIN_CHANNEL_TIMEOUT: limProcessMinChannelTimeout(pMac); break;
// 超时处理
case SIR_LIM_MAX_CHANNEL_TIMEOUT: limProcessMaxChannelTimeout(pMac); break;
case SIR_LIM_PERIODIC_PROBE_REQ_TIMEOUT:
limProcessPeriodicProbeReqTimer(pMac); break;
case SIR_LIM_JOIN_FAIL_TIMEOUT: limProcessJoinFailureTimeout(pMac); break;
case SIR_LIM_PERIODIC_JOIN_PROBE_REQ_TIMEOUT:
limProcessPeriodicJoinProbeReqTimer(pMac); break;
case SIR_LIM_AUTH_FAIL_TIMEOUT: limProcessAuthFailureTimeout(pMac); break;
case SIR_LIM_AUTH_RSP_TIMEOUT: limProcessAuthRspTimeout(pMac, Msg->bodyval); break;
case SIR_LIM_ASSOC_FAIL_TIMEOUT: limProcessAssocFailureTimeout(pMac, Msg->bodyval); break;
#ifdef WLAN_FEATURE_VOWIFI_11R
case SIR_LIM_FT_PREAUTH_RSP_TIMEOUT:limProcessFTPreauthRspTimeout(pMac); break;
#endif
#ifdef WLAN_FEATURE_LFR_MBB
case SIR_LIM_PREAUTH_MBB_RSP_TIMEOUT:
lim_process_preauth_mbb_rsp_timeout(pMac);
break;
case SIR_LIM_REASSOC_MBB_RSP_TIMEOUT:
lim_process_reassoc_mbb_rsp_timeout(pMac);
break;
#endif
case SIR_LIM_REMAIN_CHN_TIMEOUT: limProcessRemainOnChnTimeout(pMac); break;
case SIR_LIM_INSERT_SINGLESHOT_NOA_TIMEOUT:
limProcessInsertSingleShotNOATimeout(pMac); break;
case SIR_LIM_CONVERT_ACTIVE_CHANNEL_TO_PASSIVE:
limConvertActiveChannelToPassiveChannel(pMac); break;
case SIR_LIM_AUTH_RETRY_TIMEOUT:
limProcessAuthRetryTimer(pMac);
break;
case SIR_LIM_DISASSOC_ACK_TIMEOUT: limProcessDisassocAckTimeout(pMac); break;
case SIR_LIM_DEAUTH_ACK_TIMEOUT: limProcessDeauthAckTimeout(pMac); break;
case SIR_LIM_SAP_ECSA_TIMEOUT: lim_process_ap_ecsa_timeout(pMac);break;
case LIM_MLM_ADDBA_REQ: limProcessMlmAddBAReq( pMac, Msg->bodyptr ); break;
case LIM_MLM_ADDBA_RSP: limProcessMlmAddBARsp( pMac, Msg->bodyptr ); break;
case LIM_MLM_DELBA_REQ: limProcessMlmDelBAReq( pMac, Msg->bodyptr ); break;
case LIM_MLM_TSPEC_REQ:
default:
break;
} // switch (msgType)
} /*** end limProcessMlmReqMessages() ***/
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMlmReqMessages.c
void
limProcessMlmReqMessages(tpAniSirGlobal pMac, tpSirMsgQ Msg)
vendor\\qcom\\opensource\\wlan\\prima\\CORE\\MAC\\src\\pe\\lim\\limProcessMlmReqMessages.c
超时函数
static void
limProcessMaxChannelTimeout(tpAniSirGlobal pMac)
{
tANI_U8 channelNum;
/*do not process if we are in finish scan wait state i.e.
scan is aborted or finished*/
if ((pMac->lim.gLimMlmState == eLIM_MLM_WT_PROBE_RESP_STATE ||
pMac->lim.gLimMlmState == eLIM_MLM_PASSIVE_SCAN_STATE) &&
pMac->lim.gLimHalScanState != eLIM_HAL_FINISH_SCAN_WAIT_STATE)
{
limLog(pMac, LOG1, FL("Scanning : Max channel timed out")); // 打印log，提示超时
/**
* MAX channel timer timed out
* Continue channel scan.
*/
limDeactivateAndChangeTimer(pMac, eLIM_MAX_CHANNEL_TIMER);
limDeactivateAndChangeTimer(pMac, eLIM_PERIODIC_PROBE_REQ_TIMER);
pMac->lim.limTimers.gLimPeriodicProbeReqTimer.sessionId = 0xff;
pMac->lim.probeCounter = 0;
if (pMac->lim.gLimCurrentScanChannelId <=
(tANI_U32)(pMac->lim.gpLimMlmScanReq->channelList.numChannels - 1))
{
channelNum = limGetCurrentScanChannel(pMac);
}
else
{
if(pMac->lim.gpLimMlmScanReq->channelList.channelNumber)
{
channelNum = pMac->lim.gpLimMlmScanReq->channelList.channelNumber[pMac->lim.gpLimMlmScanReq->channelList.numChannels - 1];
}
else
{
channelNum = 1;
}
}
limLog(pMac, LOGW,
FL("Sending End Scan req from MAX_CH_TIMEOUT in state %d on ch-%d"), // kerel log
pMac->lim.gLimMlmState,channelNum);
limSendHalEndScanReq(pMac, channelNum, eLIM_HAL_END_SCAN_WAIT_STATE); // 停止扫描请求
}
else
{
/**
* MAX channel timer should not have timed out
* in states other than wait_scan.
* Log error.
*/
limLog(pMac, LOGW,
FL("received unexpected MAX channel timeout in mlme state %d and hal scan state %d"),
pMac->lim.gLimMlmState, pMac->lim.gLimHalScanState);
limPrintMlmState(pMac, LOGW, pMac->lim.gLimMlmState);
}
} /*** limProcessMaxChannelTimeout() ***/