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

/*
 * Copyright (c) 2011-2015 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 limSmeReqUtils.cc contains the utility functions
 * for processing SME request messages.
 * Author:        Chandra Modumudi
 * Date:          02/11/02
 * History:-
 * Date           Modified by    Modification Information
 * --------------------------------------------------------------------
 * 05/26/10       js             WPA handling in (Re)Assoc frames
 *
 */

#include "wniApi.h"
#include "wniCfg.h"
#include "cfgApi.h"
#include "sirApi.h"
#include "schApi.h"
#include "utilsApi.h"
#include "limTypes.h"
#include "limUtils.h"
#include "limAssocUtils.h"
#include "limSecurityUtils.h"
#include "limSerDesUtils.h"



/**
 * limIsRSNieValidInSmeReqMessage()
 *
 *FUNCTION:
 * This function is called to verify if the RSN IE
 * received in various SME_REQ messages is valid or not
 *
 *LOGIC:
 * RSN IE validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac   Pointer to Global MAC structure
 * @param  pRSNie Pointer to received RSN IE
 * @return true when RSN IE is valid, false otherwise
 */

static tANI_U8
limIsRSNieValidInSmeReqMessage(tpAniSirGlobal pMac, tpSirRSNie pRSNie)
{
    tANI_U8  startPos = 0;
    tANI_U32 privacy, val;
    int len;

    if (wlan_cfgGetInt(pMac, WNI_CFG_PRIVACY_ENABLED,
                  &privacy) != eSIR_SUCCESS)
    {
        limLog(pMac, LOGP,
               FL("Unable to retrieve POI from CFG"));
    }

    if (wlan_cfgGetInt(pMac, WNI_CFG_RSN_ENABLED,
                  &val) != eSIR_SUCCESS)
    {
        limLog(pMac, LOGP,
               FL("Unable to retrieve RSN_ENABLED from CFG"));
    }

    if (pRSNie->length && (!privacy || !val))
    {
        // Privacy & RSN not enabled in CFG.
        /**
         * In order to allow mixed mode for Guest access
         * allow BSS creation/join with no Privacy capability
         * yet advertising WPA IE
         */
        PELOG1(limLog(pMac, LOG1, FL("RSN ie len %d but PRIVACY %d RSN %d"),
               pRSNie->length, privacy, val);)
    }

    if (pRSNie->length)
    {
        if ((pRSNie->rsnIEdata[0] != DOT11F_EID_RSN) &&
            (pRSNie->rsnIEdata[0] != DOT11F_EID_WPA)
#ifdef FEATURE_WLAN_WAPI
            && (pRSNie->rsnIEdata[0] != DOT11F_EID_WAPI)
#endif
            )
        {
            limLog(pMac, LOGE, FL("RSN/WPA/WAPI EID %d not [%d || %d]"),
                   pRSNie->rsnIEdata[0], DOT11F_EID_RSN, 
                   DOT11F_EID_WPA);
            return false;
        }

        len = pRSNie->length;
        startPos = 0;
        while(len > 0)
        {
        // Check validity of RSN IE
            if (pRSNie->rsnIEdata[startPos] == DOT11F_EID_RSN) 
            {
                if((pRSNie->rsnIEdata[startPos+1] > DOT11F_IE_RSN_MAX_LEN) ||
                    (pRSNie->rsnIEdata[startPos+1] < DOT11F_IE_RSN_MIN_LEN))
                {
                   limLog(pMac, LOGE, FL("RSN IE len %d not [%d,%d]"),
                          pRSNie->rsnIEdata[startPos+1], DOT11F_IE_RSN_MIN_LEN,
                          DOT11F_IE_RSN_MAX_LEN);
                   return false;
                }
            }
            else if(pRSNie->rsnIEdata[startPos] == DOT11F_EID_WPA)
            {
                // Check validity of WPA IE
                if (SIR_MAC_MAX_IE_LENGTH > startPos)
                {
                    if (startPos <= (SIR_MAC_MAX_IE_LENGTH - sizeof(tANI_U32)))
                        val = sirReadU32((tANI_U8 *) &pRSNie->rsnIEdata[startPos + 2]);
                    if((pRSNie->rsnIEdata[startPos + 1] < DOT11F_IE_WPA_MIN_LEN) ||
                        (pRSNie->rsnIEdata[startPos + 1] > DOT11F_IE_WPA_MAX_LEN) ||
                        (SIR_MAC_WPA_OUI != val))
                    {
                       limLog(pMac, LOGE,
                              FL("WPA IE len %d not [%d,%d] OR data 0x%x not 0x%x"),
                              pRSNie->rsnIEdata[startPos+1], DOT11F_IE_WPA_MIN_LEN,
                              DOT11F_IE_WPA_MAX_LEN, val, SIR_MAC_WPA_OUI);

                       return false;
                    }
                }
            }
#ifdef FEATURE_WLAN_WAPI
            else if(pRSNie->rsnIEdata[startPos] == DOT11F_EID_WAPI)
            {
                if((pRSNie->rsnIEdata[startPos+1] > DOT11F_IE_WAPI_MAX_LEN) ||
                 (pRSNie->rsnIEdata[startPos+1] < DOT11F_IE_WAPI_MIN_LEN))
                {
                    limLog(pMac, LOGE,
                           FL("WAPI IE len %d not [%d,%d]"),
                           pRSNie->rsnIEdata[startPos+1], DOT11F_IE_WAPI_MIN_LEN, 
                           DOT11F_IE_WAPI_MAX_LEN);

                    return false;
                }
            }
#endif
            else
            {
                //we will never be here, simply for completeness
                return false;
            }
            startPos += 2 + pRSNie->rsnIEdata[startPos+1];  //EID + length field + length
            len -= startPos;
        }//while

    }

    return true;
} /*** end limIsRSNieValidInSmeReqMessage() ***/

/**
 * limIsAddieValidInSmeReqMessage()
 *
 *FUNCTION:
 * This function is called to verify if the Add IE
 * received in various SME_REQ messages is valid or not
 *
 *LOGIC:
 * Add IE validity checks are performed on only length
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac   Pointer to Global MAC structure
 * @param  pWSCie Pointer to received WSC IE
 * @return true when WSC IE is valid, false otherwise
 */

static tANI_U8
limIsAddieValidInSmeReqMessage(tpAniSirGlobal pMac, tpSirAddie pAddie)
{
    int left = pAddie->length;
    tANI_U8 *ptr = pAddie->addIEdata;
    tANI_U8 elem_id, elem_len;

    if (left == 0)
        return true;

    while(left >= 2)
    {
        elem_id  = ptr[0];
        elem_len = ptr[1];
        left -= 2;
        if(elem_len > left)
        {
            limLog( pMac, LOGE, 
               FL("****Invalid Add IEs eid = %d elem_len=%d left=%d*****"),
                                               elem_id,elem_len,left);
            return false;
        }
 
        left -= elem_len;
        ptr += (elem_len + 2);
    }
    // there shouldn't be any left byte
 
    
    return true;
} /*** end limIsAddieValidInSmeReqMessage() ***/

/**
 * limSetRSNieWPAiefromSmeStartBSSReqMessage()
 *
 *FUNCTION:
 * This function is called to verify if the RSN IE
 * received in various SME_REQ messages is valid or not
 *
 *LOGIC:
 * RSN IE validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac   Pointer to Global MAC structure
 * @param  pRSNie Pointer to received RSN IE
 * @return true when RSN IE is valid, false otherwise
 */

tANI_U8
limSetRSNieWPAiefromSmeStartBSSReqMessage(tpAniSirGlobal pMac, 
                                          tpSirRSNie pRSNie,
                                          tpPESession pSessionEntry)
{
    tANI_U8  wpaIndex = 0;
    tANI_U32 privacy, val;

    if (wlan_cfgGetInt(pMac, WNI_CFG_PRIVACY_ENABLED,
                  &privacy) != eSIR_SUCCESS)
    {
        limLog(pMac, LOGP,
               FL("Unable to retrieve POI from CFG"));
    }

    if (wlan_cfgGetInt(pMac, WNI_CFG_RSN_ENABLED,
                  &val) != eSIR_SUCCESS)
    {
        limLog(pMac, LOGP,
               FL("Unable to retrieve RSN_ENABLED from CFG"));
    }

    if (pRSNie->length && (!privacy || !val))
    {
        // Privacy & RSN not enabled in CFG.
        /**
         * In order to allow mixed mode for Guest access
         * allow BSS creation/join with no Privacy capability
         * yet advertising WPA IE
         */
        PELOG1(limLog(pMac, LOG1, FL("RSN ie len %d but PRIVACY %d RSN %d"),
               pRSNie->length, privacy, val);)
    }

    if (pRSNie->length)
    {
        if ((pRSNie->rsnIEdata[0] != SIR_MAC_RSN_EID) &&
            (pRSNie->rsnIEdata[0] != SIR_MAC_WPA_EID))
        {
            limLog(pMac, LOGE, FL("RSN/WPA EID %d not [%d || %d]"),
                   pRSNie->rsnIEdata[0], SIR_MAC_RSN_EID, 
                   SIR_MAC_WPA_EID);
            return false;
        }

        // Check validity of RSN IE
        if ((pRSNie->rsnIEdata[0] == SIR_MAC_RSN_EID) &&
#if 0 // Comparison always false
            (pRSNie->rsnIEdata[1] > SIR_MAC_RSN_IE_MAX_LENGTH) ||
#endif
             (pRSNie->rsnIEdata[1] < SIR_MAC_RSN_IE_MIN_LENGTH))
        {
            limLog(pMac, LOGE, FL("RSN IE len %d not [%d,%d]"),
                   pRSNie->rsnIEdata[1], SIR_MAC_RSN_IE_MIN_LENGTH, 
                   SIR_MAC_RSN_IE_MAX_LENGTH);
            return false;
        }

        if (pRSNie->length > pRSNie->rsnIEdata[1] + 2)
        {
            if (pRSNie->rsnIEdata[0] != SIR_MAC_RSN_EID)
            {
                limLog(pMac,
                       LOGE,
                       FL("First byte[%d] in rsnIEdata is not RSN_EID"),
                       pRSNie->rsnIEdata[1]);
                return false;
            }

            limLog(pMac,
                   LOG1,
                   FL("WPA IE is present along with WPA2 IE"));
            wpaIndex = 2 + pRSNie->rsnIEdata[1];
        }
        else if ((pRSNie->length == pRSNie->rsnIEdata[1] + 2) &&
                 (pRSNie->rsnIEdata[0] == SIR_MAC_RSN_EID))
        {
            limLog(pMac,
                   LOG1,
                   FL("Only RSN IE is present"));
            dot11fUnpackIeRSN(pMac,&pRSNie->rsnIEdata[2],
                              pRSNie->rsnIEdata[1],
                              &pSessionEntry->gStartBssRSNIe);
            return true;
        }
        else if ((pRSNie->length == pRSNie->rsnIEdata[1] + 2) &&
                 (pRSNie->rsnIEdata[0] == SIR_MAC_WPA_EID))
        {
            limLog(pMac,
                   LOG1,
                   FL("Only WPA IE is present"));

            dot11fUnpackIeWPA(pMac,&pRSNie->rsnIEdata[6],
                              pRSNie->rsnIEdata[1] - 4,
                              &pSessionEntry->gStartBssWPAIe);
            return true;
        }

        // Check validity of WPA IE
        if(wpaIndex +4 < SIR_MAC_MAX_IE_LENGTH )
        {
            val = sirReadU32((tANI_U8 *) &pRSNie->rsnIEdata[wpaIndex + 2]);

            if ((pRSNie->rsnIEdata[wpaIndex] == SIR_MAC_WPA_EID) &&
#if 0 // Comparison always false
                (pRSNie->rsnIEdata[wpaIndex + 1] > SIR_MAC_WPA_IE_MAX_LENGTH) ||
#endif
                ((pRSNie->rsnIEdata[wpaIndex + 1] < SIR_MAC_WPA_IE_MIN_LENGTH) ||
                (SIR_MAC_WPA_OUI != val)))
            {
                limLog(pMac, LOGE,
                  FL("WPA IE len %d not [%d,%d] OR data 0x%x not 0x%x"),
                  pRSNie->rsnIEdata[1], SIR_MAC_RSN_IE_MIN_LENGTH,
                  SIR_MAC_RSN_IE_MAX_LENGTH, val, SIR_MAC_WPA_OUI);

                return false;
            }
            else
            {
                /* Both RSN and WPA IEs are present */
                dot11fUnpackIeRSN(pMac,&pRSNie->rsnIEdata[2],
                      pRSNie->rsnIEdata[1], &pSessionEntry->gStartBssRSNIe);

                dot11fUnpackIeWPA(pMac,&pRSNie->rsnIEdata[wpaIndex + 6],
                                 pRSNie->rsnIEdata[wpaIndex + 1]-4,
                                    &pSessionEntry->gStartBssWPAIe);

            }
        }
        else
        {
            return false;
        }
    }

    return true;
} /*** end limSetRSNieWPAiefromSmeStartBSSReqMessage() ***/




/**
 * limIsBssDescrValidInSmeReqMessage()
 *
 *FUNCTION:
 * This function is called to verify if the BSS Descr
 * received in various SME_REQ messages is valid or not
 *
 *LOGIC:
 * BSS Descritipion validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac      Pointer to Global MAC structure
 * @param  pBssDescr Pointer to received Bss Descritipion
 * @return true when BSS description is valid, false otherwise
 */

static tANI_U8
limIsBssDescrValidInSmeReqMessage(tpAniSirGlobal pMac,
                                  tpSirBssDescription pBssDescr)
{
    tANI_U8 valid = true;

    if (limIsAddrBC(pBssDescr->bssId) ||
        !pBssDescr->channelId)
    {
        valid = false;
        goto end;
    }

end:
    return valid;
} /*** end limIsBssDescrValidInSmeReqMessage() ***/



/**
 * limIsSmeStartReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_START_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMsg - Pointer to received SME_START_BSS_REQ message
 * @return true  when received SME_START_REQ is formatted correctly
 *         false otherwise
 */

tANI_U8
limIsSmeStartReqValid(tpAniSirGlobal pMac, tANI_U32 *pMsg)
{
    tANI_U8 valid = true;

    if (((tpSirSmeStartReq) pMsg)->length != sizeof(tSirSmeStartReq))
    {
        /**
         * Invalid length in START_REQ message
         * Log error.
         */
        limLog(pMac, LOGW,
               FL("Invalid length %d in eWNI_SME_START_REQ"),
               ((tpSirSmeStartReq) pMsg)->length);

        valid = false;
        goto end;
    }

end:
    return valid;
} /*** end limIsSmeStartReqValid() ***/



/**
 * limIsSmeStartBssReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_START_BSS_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac         Pointer to Global MAC structure
 * @param  pStartBssReq Pointer to received SME_START_BSS_REQ message
 * @return true  when received SME_START_BSS_REQ is formatted correctly
 *         false otherwise
 */

tANI_U8
limIsSmeStartBssReqValid(tpAniSirGlobal pMac,
                         tpSirSmeStartBssReq pStartBssReq)
{
    tANI_U8   i = 0;
    tANI_U8 valid = true;

    PELOG1(limLog(pMac, LOG1,
           FL("Parsed START_BSS_REQ fields are bssType=%s (%d), channelId=%d,"
              " SSID len=%d, rsnIE len=%d, nwType=%d, rateset len=%d"),
           lim_BssTypetoString(pStartBssReq->bssType),
           pStartBssReq->bssType,
           pStartBssReq->channelId,
           pStartBssReq->ssId.length,
           pStartBssReq->rsnIE.length,
           pStartBssReq->nwType,
           pStartBssReq->operationalRateSet.numRates);)

    switch (pStartBssReq->bssType)
    {
        case eSIR_INFRASTRUCTURE_MODE:
            /**
             * Should not have received start BSS req with bssType
             * Infrastructure on STA.
             * Log error.
             */
            limLog(pMac, LOGE,
                   FL("Invalid bssType %d in eWNI_SME_START_BSS_REQ"),
                   pStartBssReq->bssType);
            valid = false;
            goto end;
            break;

        case eSIR_IBSS_MODE:
            break;

        /* Added for BT AMP support */
        case eSIR_BTAMP_STA_MODE:              
            break;
            
        /* Added for BT AMP support */
        case eSIR_BTAMP_AP_MODE:
            break;

        /* Added for SoftAP support */
        case eSIR_INFRA_AP_MODE:
            break;
        
        default:
            /**
             * Should not have received start BSS req with bssType
             * other than Infrastructure/IBSS.
             * Log error
             */
            limLog(pMac, LOGW,
               FL("Invalid bssType %d in eWNI_SME_START_BSS_REQ"),
               pStartBssReq->bssType);

            valid = false;
            goto end;
    }

    /* This below code is client specific code. TODO */
    if (pStartBssReq->bssType == eSIR_IBSS_MODE)
    {
        if (!pStartBssReq->ssId.length ||
            (pStartBssReq->ssId.length > SIR_MAC_MAX_SSID_LENGTH))
        {
            // Invalid length for SSID.  
            // Reject START_BSS_REQ
            limLog(pMac, LOGW,
                FL("Invalid SSID length in eWNI_SME_START_BSS_REQ"));

            valid = false;
            goto end;
        }
    }


    if (!limIsRSNieValidInSmeReqMessage(pMac, &pStartBssReq->rsnIE))
    {
        valid = false;
        goto end;
    }

    if (pStartBssReq->nwType != eSIR_11A_NW_TYPE &&
        pStartBssReq->nwType != eSIR_11B_NW_TYPE &&
        pStartBssReq->nwType != eSIR_11G_NW_TYPE)
    {
        valid = false;
        goto end;
    }

    if (pStartBssReq->nwType == eSIR_11A_NW_TYPE)
    {
        for (i = 0; i < pStartBssReq->operationalRateSet.numRates; i++)
            if (!sirIsArate(pStartBssReq->operationalRateSet.rate[i] & 0x7F))
        {
            // Invalid Operational rates
            // Reject START_BSS_REQ
            limLog(pMac, LOGW,
                   FL("Invalid operational rates in eWNI_SME_START_BSS_REQ"));
            sirDumpBuf(pMac, SIR_LIM_MODULE_ID, LOG2,
                       pStartBssReq->operationalRateSet.rate,
                       pStartBssReq->operationalRateSet.numRates);

            valid = false;
            goto end;
        }
    }
    // check if all the rates in the operatioal rate set are legal 11G rates
    else if (pStartBssReq->nwType == eSIR_11G_NW_TYPE)
    {
        for (i = 0; i < pStartBssReq->operationalRateSet.numRates; i++)
            if (!sirIsGrate(pStartBssReq->operationalRateSet.rate[i] & 0x7F))
        {
            // Invalid Operational rates
            // Reject START_BSS_REQ
            limLog(pMac, LOGW,
                   FL("Invalid operational rates in eWNI_SME_START_BSS_REQ"));
            sirDumpBuf(pMac, SIR_LIM_MODULE_ID, LOG2,
                       pStartBssReq->operationalRateSet.rate,
                       pStartBssReq->operationalRateSet.numRates);

            valid = false;
            goto end;
        }
    }
    else
    {
        for (i = 0; i < pStartBssReq->operationalRateSet.numRates; i++)
            if (!sirIsBrate(pStartBssReq->operationalRateSet.rate[i] & 0x7F))
        {
            // Invalid Operational rates
            // Reject START_BSS_REQ
            limLog(pMac, LOGW,
                   FL("Invalid operational rates in eWNI_SME_START_BSS_REQ"));
            sirDumpBuf(pMac, SIR_LIM_MODULE_ID, LOG2,
                       pStartBssReq->operationalRateSet.rate,
                       pStartBssReq->operationalRateSet.numRates);

            valid = false;
            goto end;
        }
    }

end:
    return valid;
} /*** end limIsSmeStartBssReqValid() ***/



/**
 * limIsSmeJoinReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_JOIN_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac       Pointer to Global MAC structure
 * @param  pJoinReq   Pointer to received SME_JOIN_REQ message
 * @return true  when received SME_JOIN_REQ is formatted correctly
 *         false otherwise
 */

tANI_U8
limIsSmeJoinReqValid(tpAniSirGlobal pMac, tpSirSmeJoinReq pJoinReq)
{
    tANI_U8 valid = true;


    if (!limIsRSNieValidInSmeReqMessage(pMac, &pJoinReq->rsnIE))
    {
        limLog(pMac, LOGE,
               FL("received SME_JOIN_REQ with invalid RSNIE"));
        valid = false;
        goto end;
    }

    if (!limIsAddieValidInSmeReqMessage(pMac, &pJoinReq->addIEScan))
    {
        limLog(pMac, LOGE,
               FL("received SME_JOIN_REQ with invalid additional IE for scan"));
        valid = false;
        goto end;
    }

    if (!limIsAddieValidInSmeReqMessage(pMac, &pJoinReq->addIEAssoc))
    {
        limLog(pMac, LOGE,
               FL("received SME_JOIN_REQ with invalid additional IE for assoc"));
        valid = false;
        goto end;
    }


    if (!limIsBssDescrValidInSmeReqMessage(pMac,
                                           &pJoinReq->bssDescription))
    {
        /// Received eWNI_SME_JOIN_REQ with invalid BSS Info
        // Log the event
        limLog(pMac, LOGE,
               FL("received SME_JOIN_REQ with invalid bssInfo"));

        valid = false;
        goto end;
    }

    /*
       Reject Join Req if the Self Mac Address and 
       the Ap's Mac Address is same
    */
    if ( vos_mem_compare( (tANI_U8* ) pJoinReq->selfMacAddr,
                       (tANI_U8 *) pJoinReq->bssDescription.bssId, 
                       (tANI_U8) (sizeof(tSirMacAddr))))
    {
        // Log the event
        limLog(pMac, LOGE,
               FL("received SME_JOIN_REQ with Self Mac and BSSID Same"));

        valid = false;
        goto end;
    }

end:
    return valid;
} /*** end limIsSmeJoinReqValid() ***/



/**
 * limIsSmeDisassocReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_DISASSOC_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac         Pointer to Global MAC structure
 * @param  pDisassocReq Pointer to received SME_DISASSOC_REQ message
 * @return true         When received SME_DISASSOC_REQ is formatted
 *                      correctly
 *         false        otherwise
 */

tANI_U8
limIsSmeDisassocReqValid(tpAniSirGlobal pMac,
                         tpSirSmeDisassocReq pDisassocReq, tpPESession psessionEntry)
{
    if (limIsGroupAddr(pDisassocReq->peerMacAddr) &&
         !limIsAddrBC(pDisassocReq->peerMacAddr))
        return false;


    return true;
} /*** end limIsSmeDisassocReqValid() ***/



/**
 * limIsSmeDisassocCnfValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_DISASSOC_CNF message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac         Pointer to Global MAC structure
 * @param  pDisassocCnf Pointer to received SME_DISASSOC_REQ message
 * @return true         When received SME_DISASSOC_CNF is formatted
 *                      correctly
 *         false        otherwise
 */

tANI_U8
limIsSmeDisassocCnfValid(tpAniSirGlobal pMac,
                         tpSirSmeDisassocCnf pDisassocCnf, tpPESession psessionEntry)
{
    if (limIsGroupAddr(pDisassocCnf->peerMacAddr))
        return false;

    return true;
} /*** end limIsSmeDisassocCnfValid() ***/



/**
 * limIsSmeDeauthReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_DEAUTH_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMac       Pointer to Global MAC structure
 * @param  pDeauthReq Pointer to received SME_DEAUTH_REQ message
 * @return true       When received SME_DEAUTH_REQ is formatted correctly
 *         false      otherwise
 */

tANI_U8
limIsSmeDeauthReqValid(tpAniSirGlobal pMac, tpSirSmeDeauthReq pDeauthReq, tpPESession psessionEntry)
{
    if (limIsGroupAddr(pDeauthReq->peerMacAddr) &&
         !limIsAddrBC(pDeauthReq->peerMacAddr))
        return false;

    return true;
} /*** end limIsSmeDeauthReqValid() ***/



/**
 * limIsSmeScanReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_SCAN_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pScanReq Pointer to received SME_SCAN_REQ message
 * @return true  when received SME_SCAN_REQ is formatted correctly
 *         false otherwise
 */

tANI_U8
limIsSmeScanReqValid(tpAniSirGlobal pMac, tpSirSmeScanReq pScanReq)
{
    tANI_U8 valid = true;
    tANI_U8 i = 0;

    if (pScanReq->numSsid > SIR_SCAN_MAX_NUM_SSID)
    {
        valid = false;
        limLog(pMac, LOGE, FL("Number of SSIDs > SIR_SCAN_MAX_NUM_SSID"));
        goto end;
    }

    for (i = 0; i < pScanReq->numSsid; i++)
    {
        if (pScanReq->ssId[i].length > SIR_MAC_MAX_SSID_LENGTH)
        {
            limLog(pMac, LOGE,
                   FL("Requested SSID length > SIR_MAC_MAX_SSID_LENGTH"));
            valid = false;
            goto end;    
        }
    }
    if ((pScanReq->bssType < 0) || (pScanReq->bssType > eSIR_AUTO_MODE))
    {
        limLog(pMac, LOGE, FL("Invalid BSS Type"));
        valid = false;
    }
    if (limIsGroupAddr(pScanReq->bssId) && !limIsAddrBC(pScanReq->bssId))
    {
        valid = false;
        limLog(pMac, LOGE, FL("BSSID is group addr and is not Broadcast Addr"));
    }
    if (!(pScanReq->scanType == eSIR_PASSIVE_SCAN || pScanReq->scanType == eSIR_ACTIVE_SCAN))
    {
        valid = false;
        limLog(pMac, LOGE, FL("Invalid Scan Type"));
    }
    if (pScanReq->channelList.numChannels > SIR_MAX_NUM_CHANNELS)
    {
        valid = false;
        limLog(pMac, LOGE, FL("Number of Channels > SIR_MAX_NUM_CHANNELS"));
    }

    /*
    ** check min/max channelTime range
    **/

    if (valid)
    {
        if ((pScanReq->scanType == eSIR_ACTIVE_SCAN) &&
            (pScanReq->maxChannelTime < pScanReq->minChannelTime))
        {
            limLog(pMac, LOGE, FL("Max Channel Time < Min Channel Time"));
            valid = false;
        }
    }

end:
    return valid;
} /*** end limIsSmeScanReqValid() ***/



/**
 * limIsSmeAuthReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_AUTH_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pAuthReq Pointer to received SME_AUTH_REQ message
 * @return true  when received SME_AUTH_REQ is formatted correctly
 *         false otherwise
 */

tANI_U8
limIsSmeAuthReqValid(tpSirSmeAuthReq pAuthReq)
{
    tANI_U8 valid = true;

    if (limIsGroupAddr(pAuthReq->peerMacAddr) ||
        (pAuthReq->authType > eSIR_AUTO_SWITCH) ||
        !pAuthReq->channelNumber)
    {
        valid = false;
        goto end;
    }

end:
    return valid;
} /*** end limIsSmeAuthReqValid() ***/



/**
 * limIsSmeSetContextReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_SET_CONTEXT_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMsg - Pointer to received SME_SET_CONTEXT_REQ message
 * @return true  when received SME_SET_CONTEXT_REQ is formatted correctly
 *         false otherwise
 */

tANI_U8
limIsSmeSetContextReqValid(tpAniSirGlobal pMac, tpSirSmeSetContextReq  pSetContextReq)
{
    tANI_U8 i = 0;
    tANI_U8 valid = true;
    tpSirKeys pKey = pSetContextReq->keyMaterial.key;

    if ((pSetContextReq->keyMaterial.edType != eSIR_ED_WEP40) &&
        (pSetContextReq->keyMaterial.edType != eSIR_ED_WEP104) &&
        (pSetContextReq->keyMaterial.edType != eSIR_ED_NONE) &&
#ifdef FEATURE_WLAN_WAPI
        (pSetContextReq->keyMaterial.edType != eSIR_ED_WPI) && 
#endif
        !pSetContextReq->keyMaterial.numKeys)
    {
        /**
         * No keys present in case of TKIP or CCMP
         * Log error.
         */
        limLog(pMac, LOGW,
           FL("No keys present in SME_SETCONTEXT_REQ for edType=%d"),
           pSetContextReq->keyMaterial.edType);

        valid = false;
        goto end;
    }

    if (pSetContextReq->keyMaterial.numKeys &&
        (pSetContextReq->keyMaterial.edType == eSIR_ED_NONE))
    {
        /**
         * Keys present in case of no ED policy
         * Log error.
         */
        limLog(pMac, LOGW,
           FL("Keys present in SME_SETCONTEXT_REQ for edType=%d"),
           pSetContextReq->keyMaterial.edType);

        valid = false;
        goto end;
    }

    if (pSetContextReq->keyMaterial.edType >= eSIR_ED_NOT_IMPLEMENTED)
    {
        /**
         * Invalid edType in the message
         * Log error.
         */
        limLog(pMac, LOGW,
               FL("Invalid edType=%d in SME_SETCONTEXT_REQ"),
               pSetContextReq->keyMaterial.edType);

        valid = false;
        goto end;
    }
    else if (pSetContextReq->keyMaterial.edType > eSIR_ED_NONE)
    {
        tANI_U32 poi;

        if (wlan_cfgGetInt(pMac, WNI_CFG_PRIVACY_ENABLED,
                      &poi) != eSIR_SUCCESS)
        {
            limLog(pMac, LOGP,
                   FL("Unable to retrieve POI from CFG"));
        }

        if (!poi)
        {
            /**
             * Privacy is not enabled
             * In order to allow mixed mode for Guest access
             * allow BSS creation/join with no Privacy capability
             * yet advertising WPA IE
             */
            PELOG1(limLog(pMac, LOG1,
               FL("Privacy is not enabled, yet non-None EDtype=%d in SME_SETCONTEXT_REQ"),
               pSetContextReq->keyMaterial.edType);)
        }
    }

    for (i = 0; i < pSetContextReq->keyMaterial.numKeys; i++)
    {
        if (((pSetContextReq->keyMaterial.edType == eSIR_ED_WEP40) &&
             (pKey->keyLength != 5)) ||
            ((pSetContextReq->keyMaterial.edType == eSIR_ED_WEP104) &&
             (pKey->keyLength != 13)) ||
            ((pSetContextReq->keyMaterial.edType == eSIR_ED_TKIP) &&
             (pKey->keyLength != 32)) ||
#ifdef FEATURE_WLAN_WAPI 
            ((pSetContextReq->keyMaterial.edType == eSIR_ED_WPI) &&
             (pKey->keyLength != 32)) ||
#endif 
            ((pSetContextReq->keyMaterial.edType == eSIR_ED_CCMP) &&
             (pKey->keyLength != 16)))
        {
            /**
             * Invalid key length for a given ED type
             * Log error.
             */
            limLog(pMac, LOGW,
               FL("Invalid keyLength =%d for edType=%d in SME_SETCONTEXT_REQ"),
               pKey->keyLength, pSetContextReq->keyMaterial.edType);

            valid = false;
            goto end;
        }
        pKey++;
    }

end:
    return valid;
} /*** end limIsSmeSetContextReqValid() ***/



/**
 * limIsSmeStopBssReqValid()
 *
 *FUNCTION:
 * This function is called by limProcessSmeReqMessages() upon
 * receiving SME_STOP_BSS_REQ message from application.
 *
 *LOGIC:
 * Message validity checks are performed in this function
 *
 *ASSUMPTIONS:
 *
 *NOTE:
 *
 * @param  pMsg - Pointer to received SME_STOP_BSS_REQ message
 * @return true  when received SME_STOP_BSS_REQ is formatted correctly
 *         false otherwise
 */

tANI_U8
limIsSmeStopBssReqValid(tANI_U32 *pMsg)
{
    tANI_U8 valid = true;

    return valid;
} /*** end limIsSmeStopBssReqValid() ***/


/**
 * limGetBssIdFromSmeJoinReqMsg()
 *
 *FUNCTION:
 * This function is called in various places to get BSSID
 * from BSS description/Neighbor BSS Info in the SME_JOIN_REQ/
 * SME_REASSOC_REQ message.
 *
 *PARAMS:
 *
 *LOGIC:
 *
 *ASSUMPTIONS:
 * NA
 *
 *NOTE:
 * NA
 *
 * @param     pBuf   - Pointer to received SME_JOIN/SME_REASSOC_REQ
 *                     message
 * @return    pBssId - Pointer to BSSID
 */

tANI_U8*
limGetBssIdFromSmeJoinReqMsg(tANI_U8 *pBuf)
{
    if (!pBuf)
        return NULL;

    pBuf += sizeof(tANI_U32); // skip message header


    pBuf += limGetU16(pBuf) + sizeof(tANI_U16); // skip RSN IE

    pBuf  += sizeof(tANI_U16);                 // skip length of BSS description

    return (pBuf);
} /*** end limGetBssIdFromSmeJoinReqMsg() ***/