/* * Copyright (c) 2012-2017 The Linux Foundation. All rights reserved. * * Previously licensed under the ISC license by Qualcomm Atheros, Inc. * * * Permission to use, copy, modify, and/or distribute this software for * any purpose with or without fee is hereby granted, provided that the * above copyright notice and this permission notice appear in all * copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* * This file was originally distributed by Qualcomm Atheros, Inc. * under proprietary terms before Copyright ownership was assigned * to the Linux Foundation. */ /* * This file limLinkMonitoringAlgo.cc contains the code for * Link monitoring algorithm on AP and heart beat failure * handling on STA. * Author: Chandra Modumudi * Date: 03/01/02 * History:- * Date Modified by Modification Information * -------------------------------------------------------------------- * */ #include "aniGlobal.h" #include "wniCfg.h" #include "cfgApi.h" #include "schApi.h" #include "pmmApi.h" #include "utilsApi.h" #include "limAssocUtils.h" #include "limTypes.h" #include "limUtils.h" #include "limPropExtsUtils.h" #ifdef FEATURE_WLAN_DIAG_SUPPORT_LIM //FEATURE_WLAN_DIAG_SUPPORT #include "vos_diag_core_log.h" #endif //FEATURE_WLAN_DIAG_SUPPORT #include "limSession.h" #include "limSerDesUtils.h" #ifdef WLAN_FEATURE_LFR_MBB #include "lim_mbb.h" #endif /** * limSendKeepAliveToPeer() * *FUNCTION: * This function is called to send Keep alive message to peer * *LOGIC: * *ASSUMPTIONS: * *NOTE: * NA * * @param pMac - Pointer to Global MAC structure * @return None */ void limSendKeepAliveToPeer(tpAniSirGlobal pMac) { } /*** limSendKeepAliveToPeer() ***/ /** --------------------------------------------------------- \fn limDeleteStaContext \brief This function handles the message from HAL: \ WDA_DELETE_STA_CONTEXT_IND. This function \ validates that the given station id exist, and if so, \ deletes the station by calling limTriggerSTAdeletion. \param tpAniSirGlobal pMac \param tpSirMsgQ limMsg \return none -----------------------------------------------------------*/ void limDeleteStaContext(tpAniSirGlobal pMac, tpSirMsgQ limMsg) { tpDeleteStaContext pMsg = (tpDeleteStaContext)limMsg->bodyptr; tpDphHashNode pStaDs; tpPESession psessionEntry ; tANI_U8 sessionId; if(NULL == pMsg) { PELOGE(limLog(pMac, LOGE,FL("Invalid body pointer in message"));) return; } if((psessionEntry = peFindSessionByBssid(pMac,pMsg->bssId,&sessionId))== NULL) { PELOGE(limLog(pMac, LOGE,FL("session does not exist for given BSSId"));) vos_mem_free(pMsg); return; } #ifdef WLAN_FEATURE_LFR_MBB if (lim_is_mbb_reassoc_in_progress(pMac, psessionEntry)) { limLog(pMac, LOGE, FL("Ignore delete sta as LFR MBB in progress")); return; } #endif switch(pMsg->reasonCode) { case HAL_DEL_STA_REASON_CODE_KEEP_ALIVE: case HAL_DEL_STA_REASON_CODE_TIM_BASED: PELOGE(limLog(pMac, LOGE, FL(" Deleting station: staId = %d, reasonCode = %d"), pMsg->staId, pMsg->reasonCode);) if (eLIM_STA_IN_IBSS_ROLE == psessionEntry->limSystemRole) { vos_mem_free(pMsg); return; } pStaDs = dphLookupAssocId(pMac, pMsg->staId, &pMsg->assocId, &psessionEntry->dph.dphHashTable); if (!pStaDs) { PELOGE(limLog(pMac, LOGE, FL("Skip STA deletion (invalid STA) limSystemRole=%d"),psessionEntry->limSystemRole);) vos_mem_free(pMsg); return; } /* check and see if same staId. This is to avoid the scenario * where we're trying to delete a staId we just added. */ if (pStaDs->staIndex != pMsg->staId) { PELOGE(limLog(pMac, LOGE, FL("staid mismatch: %d vs %d "), pStaDs->staIndex, pMsg->staId);) vos_mem_free(pMsg); return; } if((eLIM_BT_AMP_AP_ROLE == psessionEntry->limSystemRole) || (eLIM_AP_ROLE == psessionEntry->limSystemRole)) { limLog(pMac, LOG1, FL("SAP:lim Delete Station Context (staId: %d, assocId: %d) "), pMsg->staId, pMsg->assocId); /* * Check if Deauth/Disassoc is triggered from Host. * If mlmState is in some transient state then * don't trigger STA deletion to avoid the race * condition. */ if ((pStaDs && ((pStaDs->mlmStaContext.mlmState != eLIM_MLM_LINK_ESTABLISHED_STATE) && (pStaDs->mlmStaContext.mlmState != eLIM_MLM_WT_ASSOC_CNF_STATE) && (pStaDs->mlmStaContext.mlmState != eLIM_MLM_ASSOCIATED_STATE)))) { PELOGE(limLog(pMac, LOGE, FL("SAP:received Del STA context in some transit state(staId: %d, assocId: %d)"), pMsg->staId, pMsg->assocId);) vos_mem_free(pMsg); return; } else { limSendDisassocMgmtFrame(pMac, eSIR_MAC_DISASSOC_DUE_TO_INACTIVITY_REASON, pStaDs->staAddr, psessionEntry, FALSE); limTriggerSTAdeletion(pMac, pStaDs, psessionEntry); } } else { #ifdef FEATURE_WLAN_TDLS if(eLIM_STA_ROLE == psessionEntry->limSystemRole && STA_ENTRY_TDLS_PEER == pStaDs->staType) { //TeardownLink with PEER //Reason code HAL_DEL_STA_REASON_CODE_KEEP_ALIVE means //eSIR_MAC_TDLS_TEARDOWN_PEER_UNREACHABLE limSendSmeTDLSDelStaInd(pMac, pStaDs, psessionEntry, /*pMsg->reasonCode*/ eSIR_MAC_TDLS_TEARDOWN_PEER_UNREACHABLE); } else { #endif //TearDownLink with AP tLimMlmDeauthInd mlmDeauthInd; PELOGW(limLog(pMac, LOGW, FL("lim Delete Station Context (staId: %d, assocId: %d) "), pMsg->staId, pMsg->assocId);) if ((pStaDs && ((pStaDs->mlmStaContext.mlmState != eLIM_MLM_LINK_ESTABLISHED_STATE) && (pStaDs->mlmStaContext.mlmState != eLIM_MLM_WT_ASSOC_CNF_STATE) && (pStaDs->mlmStaContext.mlmState != eLIM_MLM_ASSOCIATED_STATE)))) { /** * Received WDA_DELETE_STA_CONTEXT_IND for STA that does not * have context or in some transit state. * Log error */ PELOGE(limLog(pMac, LOGE, FL("received WDA_DELETE_STA_CONTEXT_IND for STA that either has no context or in some transit state, Addr= " MAC_ADDRESS_STR), MAC_ADDR_ARRAY(pMsg->bssId));) vos_mem_free(pMsg); return; } if( pMac->roam.configParam.sendDeauthBeforeCon ) { tANI_U8 apCount = pMac->lim.gLimHeartBeatApMacIndex; if(pMac->lim.gLimHeartBeatApMacIndex) pMac->lim.gLimHeartBeatApMacIndex = 0; else pMac->lim.gLimHeartBeatApMacIndex = 1; limLog(pMac, LOG1, FL("lim Delete Station Context for MAC " MAC_ADDRESS_STR" Store it on Index %d"), MAC_ADDR_ARRAY(pStaDs->staAddr),apCount); sirCopyMacAddr(pMac->lim.gLimHeartBeatApMac[apCount],pStaDs->staAddr); } pStaDs->mlmStaContext.disassocReason = eSIR_MAC_DISASSOC_DUE_TO_INACTIVITY_REASON; pStaDs->mlmStaContext.cleanupTrigger = eLIM_LINK_MONITORING_DEAUTH; if (pStaDs->isDisassocDeauthInProgress) { limLog(pMac, LOGE, FL("No need to cleanup as already" "disassoc or deauth in progress")); return; } else pStaDs->isDisassocDeauthInProgress++; // Issue Deauth Indication to SME. vos_mem_copy((tANI_U8 *) &mlmDeauthInd.peerMacAddr, pStaDs->staAddr, sizeof(tSirMacAddr)); mlmDeauthInd.reasonCode = (tANI_U8) pStaDs->mlmStaContext.disassocReason; mlmDeauthInd.deauthTrigger = pStaDs->mlmStaContext.cleanupTrigger; #ifdef FEATURE_WLAN_TDLS /* Delete all TDLS peers connected before leaving BSS*/ limDeleteTDLSPeers(pMac, psessionEntry); #endif limPostSmeMessage(pMac, LIM_MLM_DEAUTH_IND, (tANI_U32 *) &mlmDeauthInd); limSendSmeDeauthInd(pMac, pStaDs, psessionEntry); #ifdef FEATURE_WLAN_TDLS } #endif } break; case HAL_DEL_STA_REASON_CODE_UNKNOWN_A2: PELOGE(limLog(pMac, LOGE, FL(" Deleting Unknown station "));) limPrintMacAddr(pMac, pMsg->addr2, LOGE); limSendDeauthMgmtFrame( pMac, eSIR_MAC_CLASS3_FRAME_FROM_NON_ASSOC_STA_REASON, pMsg->addr2, psessionEntry, FALSE); break; default: PELOGE(limLog(pMac, LOGE, FL(" Unknown reason code "));) break; } vos_mem_free(pMsg); return; } /** * limTriggerSTAdeletion() * *FUNCTION: * This function is called to trigger STA context deletion * *LOGIC: * *ASSUMPTIONS: * *NOTE: * NA * * @param pMac - Pointer to global MAC structure * @param pStaDs - Pointer to internal STA Datastructure * @return None */ void limTriggerSTAdeletion(tpAniSirGlobal pMac, tpDphHashNode pStaDs, tpPESession psessionEntry) { tLimMlmDisassocInd mlmDisassocInd; if (!pStaDs) { PELOGW(limLog(pMac, LOGW, FL("Skip STA deletion (invalid STA)"));) return; } if ((pStaDs->mlmStaContext.mlmState == eLIM_MLM_WT_DEL_STA_RSP_STATE) || (pStaDs->mlmStaContext.mlmState == eLIM_MLM_WT_DEL_BSS_RSP_STATE)|| pStaDs->sta_deletion_in_progress) { /* Already in the process of deleting context for the peer */ limLog(pMac, LOG1, FL("Deletion is in progress (%d) for peer:%pK in mlmState %d"), pStaDs->sta_deletion_in_progress, pStaDs->staAddr, pStaDs->mlmStaContext.mlmState); return; } pStaDs->sta_deletion_in_progress = true; pStaDs->mlmStaContext.disassocReason = eSIR_MAC_DISASSOC_DUE_TO_INACTIVITY_REASON; pStaDs->mlmStaContext.cleanupTrigger = eLIM_LINK_MONITORING_DISASSOC; vos_mem_copy(&mlmDisassocInd.peerMacAddr, pStaDs->staAddr, sizeof(tSirMacAddr)); mlmDisassocInd.reasonCode = eSIR_MAC_DISASSOC_DUE_TO_INACTIVITY_REASON; mlmDisassocInd.disassocTrigger = eLIM_LINK_MONITORING_DISASSOC; /* Update PE session Id */ mlmDisassocInd.sessionId = psessionEntry->peSessionId; limPostSmeMessage(pMac, LIM_MLM_DISASSOC_IND, (tANI_U32 *) &mlmDisassocInd); // Issue Disassoc Indication to SME. limSendSmeDisassocInd(pMac, pStaDs, psessionEntry); } /*** end limTriggerSTAdeletion() ***/ /** * limTearDownLinkWithAp() * *FUNCTION: * This function is called when heartbeat (beacon reception) * fails on STA * *LOGIC: * *ASSUMPTIONS: * *NOTE: * * @param pMac - Pointer to Global MAC structure * @return None */ void limTearDownLinkWithAp(tpAniSirGlobal pMac, tANI_U8 sessionId, tSirMacReasonCodes reasonCode) { tpDphHashNode pStaDs = NULL; //tear down the following sessionEntry tpPESession psessionEntry; if((psessionEntry = peFindSessionBySessionId(pMac, sessionId))== NULL) { limLog(pMac, LOGP,FL("Session Does not exist for given sessionID")); return; } /** * Heart beat failed for upto threshold value * and AP did not respond for Probe request. * Trigger link tear down. */ pMac->pmm.inMissedBeaconScenario = FALSE; limLog(pMac, LOGW, FL("No ProbeRsp from AP after HB failure. Tearing down link")); // Deactivate heartbeat timer limHeartBeatDeactivateAndChangeTimer(pMac, psessionEntry); // Announce loss of link to Roaming algorithm // and cleanup by sending SME_DISASSOC_REQ to SME pStaDs = dphGetHashEntry(pMac, DPH_STA_HASH_INDEX_PEER, &psessionEntry->dph.dphHashTable); if (pStaDs != NULL) { tLimMlmDeauthInd mlmDeauthInd; #ifdef FEATURE_WLAN_TDLS /* Delete all TDLS peers connected before leaving BSS*/ limDeleteTDLSPeers(pMac, psessionEntry); #endif pStaDs->mlmStaContext.disassocReason = reasonCode; pStaDs->mlmStaContext.cleanupTrigger = eLIM_LINK_MONITORING_DEAUTH; /// Issue Deauth Indication to SME. vos_mem_copy((tANI_U8 *) &mlmDeauthInd.peerMacAddr, pStaDs->staAddr, sizeof(tSirMacAddr)); /* if sendDeauthBeforeCon is enabled and reasoncode is Beacon Missed * Store the MAC of AP in the flip flop buffer. This MAC will be * used to send Deauth before connection, if we connect to same AP * after HB failure. */ if(pMac->roam.configParam.sendDeauthBeforeCon && eSIR_BEACON_MISSED == reasonCode) { int apCount = pMac->lim.gLimHeartBeatApMacIndex; if(pMac->lim.gLimHeartBeatApMacIndex) pMac->lim.gLimHeartBeatApMacIndex = 0; else pMac->lim.gLimHeartBeatApMacIndex = 1; limLog(pMac, LOGE, FL("HB Failure on MAC " MAC_ADDRESS_STR" Store it on Index %d"), MAC_ADDR_ARRAY(pStaDs->staAddr),apCount); sirCopyMacAddr(pMac->lim.gLimHeartBeatApMac[apCount],pStaDs->staAddr); } mlmDeauthInd.reasonCode = (tANI_U8) pStaDs->mlmStaContext.disassocReason; mlmDeauthInd.deauthTrigger = pStaDs->mlmStaContext.cleanupTrigger; limPostSmeMessage(pMac, LIM_MLM_DEAUTH_IND, (tANI_U32 *) &mlmDeauthInd); limSendSmeDeauthInd(pMac, pStaDs, psessionEntry); } } /*** limTearDownLinkWithAp() ***/ /** * limHandleHeartBeatFailure() * *FUNCTION: * This function is called when heartbeat (beacon reception) * fails on STA * *LOGIC: * *ASSUMPTIONS: * *NOTE: * * @param pMac - Pointer to Global MAC structure * @return None */ void limHandleHeartBeatFailure(tpAniSirGlobal pMac,tpPESession psessionEntry) { #ifdef FEATURE_WLAN_DIAG_SUPPORT_LIM //FEATURE_WLAN_DIAG_SUPPORT vos_log_beacon_update_pkt_type *log_ptr = NULL; #endif //FEATURE_WLAN_DIAG_SUPPORT /* If gLimHeartBeatTimer fires between the interval of sending WDA_ENTER_BMPS_REQUEST * to the HAL and receiving WDA_ENTER_BMPS_RSP from the HAL, then LIM (PE) tries to Process the * SIR_LIM_HEAR_BEAT_TIMEOUT message but The PE state is ePMM_STATE_BMPS_SLEEP so PE dont * want to handle heartbeat timeout in the BMPS, because Firmware handles it in BMPS. * So just return from heartbeatfailure handler */ if(!IS_ACTIVEMODE_OFFLOAD_FEATURE_ENABLE && (!limIsSystemInActiveState(pMac))) return; #ifdef FEATURE_WLAN_DIAG_SUPPORT_LIM //FEATURE_WLAN_DIAG_SUPPORT WLAN_VOS_DIAG_LOG_ALLOC(log_ptr, vos_log_beacon_update_pkt_type, LOG_WLAN_BEACON_UPDATE_C); if(log_ptr) log_ptr->bcn_rx_cnt = psessionEntry->LimRxedBeaconCntDuringHB; WLAN_VOS_DIAG_LOG_REPORT(log_ptr); #endif //FEATURE_WLAN_DIAG_SUPPORT /* Ensure HB Status for the session has been reseted */ psessionEntry->LimHBFailureStatus = eANI_BOOLEAN_FALSE; #ifdef WLAN_FEATURE_LFR_MBB if (lim_is_mbb_reassoc_in_progress(pMac, psessionEntry)) { limLog(pMac, LOGE, FL("Ignore Heartbeat failure as LFR MBB in progress")); return; } #endif if (((psessionEntry->limSystemRole == eLIM_STA_ROLE)|| (psessionEntry->limSystemRole == eLIM_BT_AMP_STA_ROLE))&& (psessionEntry->limMlmState == eLIM_MLM_LINK_ESTABLISHED_STATE)&& (psessionEntry->limSmeState != eLIM_SME_WT_DISASSOC_STATE) && (psessionEntry->limSmeState != eLIM_SME_WT_DEAUTH_STATE)) { if (!pMac->sys.gSysEnableLinkMonitorMode) return; /* Ignore HB if channel switch is in progress */ if (psessionEntry->gLimSpecMgmt.dot11hChanSwState == eLIM_11H_CHANSW_RUNNING) { limLog(pMac, LOGE, FL("Ignore Heartbeat failure as Channel switch is in progress")); pMac->pmm.inMissedBeaconScenario = false; return; } /** * Beacon frame not received within heartbeat timeout. */ limLog(pMac, LOGW, FL("Heartbeat Failure")); pMac->lim.gLimHBfailureCntInLinkEstState++; /** * Check if connected on the DFS channel, if not connected on * DFS channel then only send the probe request otherwise tear down the link */ if(!limIsconnectedOnDFSChannel(psessionEntry->currentOperChannel)) { /*** Detected continuous Beacon Misses ***/ psessionEntry->LimHBFailureStatus= eANI_BOOLEAN_TRUE; /*Reset the HB packet count before sending probe*/ limResetHBPktCount(psessionEntry); /** * Send Probe Request frame to AP to see if * it is still around. Wait until certain * timeout for Probe Response from AP. */ PELOGW(limLog(pMac, LOGW, FL("Heart Beat missed from AP. Sending Probe Req"));) /* for searching AP, we don't include any additional IE */ limSendProbeReqMgmtFrame(pMac, &psessionEntry->ssId, psessionEntry->bssId, psessionEntry->currentOperChannel,psessionEntry->selfMacAddr, psessionEntry->dot11mode, 0, NULL); } else { PELOGW(limLog(pMac, LOGW, FL("Heart Beat missed from AP on DFS chanel moving to passive"));) if (psessionEntry->gLimSpecMgmt.dfs_channel_csa) { #ifdef WLAN_FEATURE_ROAM_SCAN_OFFLOAD if (pMac->roam.configParam.isRoamOffloadScanEnabled) { csrRoamOffloadScan(pMac, ROAM_SCAN_OFFLOAD_START, REASON_CONNECT); } #endif limFrameTransmissionControl(pMac, eLIM_TX_ALL, eLIM_RESUME_TX); psessionEntry->gLimSpecMgmt.dfs_channel_csa = false; } if (psessionEntry->currentOperChannel < SIR_MAX_24G_5G_CHANNEL_RANGE){ limCovertChannelScanType(pMac, psessionEntry->currentOperChannel, false); pMac->lim.dfschannelList.timeStamp[psessionEntry->currentOperChannel] = 0; } /* Connected on DFS channel so should not send the probe request * tear down the link directly */ limTearDownLinkWithAp(pMac, psessionEntry->peSessionId, eSIR_BEACON_MISSED); } } else { /** * Heartbeat timer may have timed out * while we're doing background scanning/learning * or in states other than link-established state. * Log error. */ limLog(pMac, LOG1, FL("received heartbeat timeout in state %d"), psessionEntry->limMlmState); limPrintMlmState(pMac, LOG1, psessionEntry->limMlmState); pMac->lim.gLimHBfailureCntInOtherStates++; limReactivateHeartBeatTimer(pMac, psessionEntry); } } /*** limHandleHeartBeatFailure() ***/