CORE/MAC/src/pe/lim/limProcessDisassocFrame.c

/*
 * Copyright (c) 2012-2014 Qualcomm Atheros, Inc.
 * All Rights Reserved.
 * Qualcomm Atheros Confidential and Proprietary.
 */
/*
 * Airgo Networks, Inc proprietary. All rights reserved.
 * This file limProcessDisassocFrame.cc contains the code
 * for processing Disassocation Frame.
 * Author:        Chandra Modumudi
 * Date:          03/24/02
 * History:-
 * Date           Modified by    Modification Information
 * --------------------------------------------------------------------
 *
 */
#include "palTypes.h"
#include "wniApi.h"
#include "sirApi.h"
#include "aniGlobal.h"
#include "wniCfgSta.h"

#include "utilsApi.h"
#include "limTypes.h"
#include "limUtils.h"
#include "limAssocUtils.h"
#include "limSecurityUtils.h"
#include "limSerDesUtils.h"
#include "limSendMessages.h"
#include "schApi.h"


/**
 * limProcessDisassocFrame
 *
 *FUNCTION:
 * This function is called by limProcessMessageQueue() upon
 * Disassociation frame reception.
 *
 *LOGIC:
 *
 *ASSUMPTIONS:
 * DPH drops packets for STA with 'valid' bit in pStaDs set to '0'.
 *
 *NOTE:
 *
 * @param  pMac - Pointer to Global MAC structure
 * @param  *pRxPacketInfo - A pointer to Rx packet info structure
 * @return None
 */
void
limProcessDisassocFrame(tpAniSirGlobal pMac, tANI_U8 *pRxPacketInfo, tpPESession psessionEntry)
{
    tANI_U8                 *pBody;
    tANI_U16                aid, reasonCode;
    tpSirMacMgmtHdr    pHdr;
    tpDphHashNode      pStaDs;
    tLimMlmDisassocInd mlmDisassocInd;
#ifdef WLAN_FEATURE_11W
    tANI_U32            frameLen;
#endif

    pHdr = WDA_GET_RX_MAC_HEADER(pRxPacketInfo);
    pBody = WDA_GET_RX_MPDU_DATA(pRxPacketInfo);


    if (limIsGroupAddr(pHdr->sa))
    {
        // Received Disassoc frame from a BC/MC address
        // Log error and ignore it
        PELOGE(limLog(pMac, LOGE,
               FL("received Disassoc frame from a BC/MC address"));)

        return;
    }

    if (limIsGroupAddr(pHdr->da) && !limIsAddrBC(pHdr->da))
    {
        // Received Disassoc frame for a MC address
        // Log error and ignore it
        PELOGE(limLog(pMac, LOGE,
               FL("received Disassoc frame for a MC address"));)

        return;
    }

#ifdef WLAN_FEATURE_11W
    /* PMF: If this session is a PMF session, then ensure that this frame was protected */
    if(psessionEntry->limRmfEnabled  && (WDA_GET_RX_DPU_FEEDBACK(pRxPacketInfo) & DPU_FEEDBACK_UNPROTECTED_ERROR))
    {
        PELOGE(limLog(pMac, LOGE, FL("received an unprotected disassoc from AP"));)
        // If the frame received is unprotected, forward it to the supplicant to initiate
        // an SA query
        frameLen = WDA_GET_RX_PAYLOAD_LEN(pRxPacketInfo);
        //send the unprotected frame indication to SME
        limSendSmeUnprotectedMgmtFrameInd( pMac, pHdr->fc.subType,
                                           (tANI_U8*)pHdr, (frameLen + sizeof(tSirMacMgmtHdr)),
                                           psessionEntry->smeSessionId, psessionEntry);
        return;
    }
#endif

    // Get reasonCode from Disassociation frame body
    reasonCode = sirReadU16(pBody);

    PELOG2(limLog(pMac, LOGE,
        FL("Received Disassoc frame for Addr: "MAC_ADDRESS_STR"(mlm state=%s, sme state=%d),"
        "with reason code %d from "MAC_ADDRESS_STR), MAC_ADDR_ARRAY(pHdr->da),
        limMlmStateStr(psessionEntry->limMlmState), psessionEntry->limSmeState, reasonCode,
        MAC_ADDR_ARRAY(pHdr->sa));)

    /**
   * Extract 'associated' context for STA, if any.
   * This is maintained by DPH and created by LIM.
   */
     pStaDs = dphLookupHashEntry(pMac, pHdr->sa, &aid, &psessionEntry->dph.dphHashTable);

    if (pStaDs == NULL)
    {
        /**
         * Disassociating STA is not associated.
         * Log error.
         */
        PELOGE(limLog(pMac, LOGE,
           FL("received Disassoc frame from STA that does not have context "
           "reasonCode=%d, addr "MAC_ADDRESS_STR),
            reasonCode,MAC_ADDR_ARRAY(pHdr->sa));)

        return;
    }

    if (limCheckDisassocDeauthAckPending(pMac, (tANI_U8*)pHdr->sa))
    {
        PELOGE(limLog(pMac, LOGE,
                    FL("Ignore the DisAssoc received, while waiting "
                    "for ack of disassoc/deauth"));)
        limCleanUpDisassocDeauthReq(pMac,(tANI_U8*)pHdr->sa, 1);
        return;
    }

    /** If we are in the Wait for ReAssoc Rsp state */
    if (limIsReassocInProgress(pMac,psessionEntry)) {
        /** If we had received the DisAssoc from,
        *     a. the Current AP during ReAssociate to different AP in same ESS
        *     b. Unknown AP
        *   drop/ignore the DisAssoc received
        */
        if (!IS_REASSOC_BSSID(pMac,pHdr->sa,psessionEntry)) {
            PELOGE(limLog(pMac, LOGE, FL("Ignore the DisAssoc received, while "
                     "Processing ReAssoc with different/unknown AP"));)
            return;
        }
        /** If the Disassoc is received from the new AP to which we tried to ReAssociate
         *  Drop ReAssoc and Restore the Previous context( current connected AP).
         */
        if (!IS_CURRENT_BSSID(pMac, pHdr->sa,psessionEntry)) {
            PELOGE(limLog(pMac, LOGE, FL("received Disassoc from the New AP to "
                                      "which ReAssoc is sent "));)
            limRestorePreReassocState(pMac,
                                  eSIR_SME_REASSOC_REFUSED, reasonCode,psessionEntry);
            return;
        }
    }

    if ( (psessionEntry->limSystemRole == eLIM_AP_ROLE) ||
         (psessionEntry->limSystemRole == eLIM_BT_AMP_AP_ROLE) )
    {
        switch (reasonCode)
        {
            case eSIR_MAC_UNSPEC_FAILURE_REASON:
            case eSIR_MAC_DISASSOC_DUE_TO_INACTIVITY_REASON:
            case eSIR_MAC_DISASSOC_LEAVING_BSS_REASON:
            case eSIR_MAC_MIC_FAILURE_REASON:
            case eSIR_MAC_4WAY_HANDSHAKE_TIMEOUT_REASON:
            case eSIR_MAC_GR_KEY_UPDATE_TIMEOUT_REASON:
            case eSIR_MAC_RSN_IE_MISMATCH_REASON:
            case eSIR_MAC_1X_AUTH_FAILURE_REASON:
                // Valid reasonCode in received Disassociation frame
                break;

            default:
                // Invalid reasonCode in received Disassociation frame
                PELOGE(limLog(pMac, LOGE,
                       FL("received Disassoc frame with invalid reasonCode "
                       "%d from "MAC_ADDRESS_STR),
                       reasonCode, MAC_ADDR_ARRAY(pHdr->sa));)
                break;
        }
    }
    else if (  ((psessionEntry->limSystemRole == eLIM_STA_ROLE) ||
                (psessionEntry->limSystemRole == eLIM_BT_AMP_STA_ROLE)) &&  
               ((psessionEntry->limSmeState != eLIM_SME_WT_JOIN_STATE) && 
                (psessionEntry->limSmeState != eLIM_SME_WT_AUTH_STATE)  &&
                (psessionEntry->limSmeState != eLIM_SME_WT_ASSOC_STATE)  &&
                (psessionEntry->limSmeState != eLIM_SME_WT_REASSOC_STATE) ))
    {
        switch (reasonCode)
        {
            case eSIR_MAC_UNSPEC_FAILURE_REASON:
            case eSIR_MAC_DISASSOC_DUE_TO_INACTIVITY_REASON:
            case eSIR_MAC_DISASSOC_DUE_TO_DISABILITY_REASON:
            case eSIR_MAC_CLASS2_FRAME_FROM_NON_AUTH_STA_REASON:
            case eSIR_MAC_CLASS3_FRAME_FROM_NON_ASSOC_STA_REASON:
            case eSIR_MAC_MIC_FAILURE_REASON:
            case eSIR_MAC_4WAY_HANDSHAKE_TIMEOUT_REASON:
            case eSIR_MAC_GR_KEY_UPDATE_TIMEOUT_REASON:
            case eSIR_MAC_RSN_IE_MISMATCH_REASON:
            case eSIR_MAC_1X_AUTH_FAILURE_REASON:
            case eSIR_MAC_PREV_AUTH_NOT_VALID_REASON:
                // Valid reasonCode in received Disassociation frame
                break;

            case eSIR_MAC_DEAUTH_LEAVING_BSS_REASON:
            case eSIR_MAC_DISASSOC_LEAVING_BSS_REASON:
                // Valid reasonCode in received Disassociation frame
                // as long as we're not about to channel switch
                if(psessionEntry->gLimChannelSwitch.state != eLIM_CHANNEL_SWITCH_IDLE)
                {
                    limLog(pMac, LOGE,
                        FL("Ignoring disassoc frame due to upcoming "
                           "channel switch, from "MAC_ADDRESS_STR),MAC_ADDR_ARRAY(pHdr->sa));
                    return;
                }
                break;

            default:
                // Invalid reasonCode in received Disassociation frame
                // Log error and ignore the frame
                PELOGE(limLog(pMac, LOGE,
                       FL("received Disassoc frame with invalid reasonCode "
                       "%d from "MAC_ADDRESS_STR), reasonCode,
                       MAC_ADDR_ARRAY(pHdr->sa));)
                return;
        }
    }
    else
    {
        // Received Disassociation frame in either IBSS
        // or un-known role. Log and ignore it
        limLog(pMac, LOGE,
               FL("received Disassoc frame with invalid reasonCode %d in role "
               "%d in sme state %d from "MAC_ADDRESS_STR), reasonCode,
               psessionEntry->limSystemRole, psessionEntry->limSmeState,
               MAC_ADDR_ARRAY(pHdr->sa));

        return;
    }

    if ((pStaDs->mlmStaContext.mlmState == eLIM_MLM_WT_DEL_STA_RSP_STATE) ||
        (pStaDs->mlmStaContext.mlmState == eLIM_MLM_WT_DEL_BSS_RSP_STATE))
    {
        /**
         * Already in the process of deleting context for the peer
         * and received Disassociation frame. Log and Ignore.
         */
        PELOGE(limLog(pMac, LOGE,
               FL("received Disassoc frame in state %d from "MAC_ADDRESS_STR),
               pStaDs->mlmStaContext.mlmState, MAC_ADDR_ARRAY(pHdr->sa));)

        return;
    } 

    if (pStaDs->mlmStaContext.mlmState != eLIM_MLM_LINK_ESTABLISHED_STATE)
    {
        /**
         * Requesting STA is in some 'transient' state?
         * Log error.
         */
        PELOGE(limLog(pMac, LOGE,
               FL("received Disassoc frame from peer that is in state %X, addr "
               MAC_ADDRESS_STR),
               pStaDs->mlmStaContext.mlmState, MAC_ADDR_ARRAY(pHdr->sa));)
    } // if (pStaDs->mlmStaContext.mlmState != eLIM_MLM_LINK_ESTABLISHED_STATE)

    pStaDs->mlmStaContext.cleanupTrigger = eLIM_PEER_ENTITY_DISASSOC;
    pStaDs->mlmStaContext.disassocReason = (tSirMacReasonCodes) reasonCode;

    // Issue Disassoc Indication to SME.
    vos_mem_copy((tANI_U8 *) &mlmDisassocInd.peerMacAddr,
                 (tANI_U8 *) pStaDs->staAddr,
                 sizeof(tSirMacAddr));
    mlmDisassocInd.reasonCode =
        (tANI_U8) pStaDs->mlmStaContext.disassocReason;
    mlmDisassocInd.disassocTrigger = eLIM_PEER_ENTITY_DISASSOC;

    /* Update PE session Id  */
    mlmDisassocInd.sessionId = psessionEntry->peSessionId;

    if (limIsReassocInProgress(pMac,psessionEntry)) {

    /* If we're in the middle of ReAssoc and received disassoc from 
     * the ReAssoc AP, then notify SME by sending REASSOC_RSP with 
     * failure result code. By design, SME will then issue "Disassoc"  
     * and cleanup will happen at that time. 
     */
        PELOGE(limLog(pMac, LOGE, FL("received Disassoc from AP while waiting "
                                  "for Reassoc Rsp"));)
     
        if (psessionEntry->limAssocResponseData) {
            vos_mem_free(psessionEntry->limAssocResponseData);
            psessionEntry->limAssocResponseData = NULL;                            
        }

        limRestorePreReassocState(pMac,eSIR_SME_REASSOC_REFUSED, reasonCode,psessionEntry);
        return;
    }

    limPostSmeMessage(pMac, LIM_MLM_DISASSOC_IND,
                      (tANI_U32 *) &mlmDisassocInd);


    // send eWNI_SME_DISASSOC_IND to SME  
    limSendSmeDisassocInd(pMac, pStaDs,psessionEntry);

    return;
} /*** end limProcessDisassocFrame() ***/