/*
 * Copyright (c) 2015-2017 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.
 */

#ifdef FEATURE_OEM_DATA_SUPPORT

/*================================================================================ 
    \file wlan_hdd_oemdata.c
  
    \brief Linux Wireless Extensions for oem data req/rsp
  
    $Id: wlan_hdd_oemdata.c,v 1.34 2010/04/15 01:49:23 -- VINAY
  
    Copyright (C) Qualcomm Inc.
    
================================================================================*/

#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/wireless.h>
#include <wlan_hdd_includes.h>
#include <net/arp.h>
#include <vos_sched.h>
#include "qwlan_version.h"

static struct hdd_context_s *pHddCtx;

/*---------------------------------------------------------------------------------------------

  \brief hdd_OemDataReqCallback() - 

  This function also reports the results to the user space

  \return - eHalStatus enumeration

-----------------------------------------------------------------------------------------------*/
static eHalStatus hdd_OemDataReqCallback(tHalHandle hHal, 
        void *pContext,
        tANI_U32 oemDataReqID,
        eOemDataReqStatus oemDataReqStatus)
{
    eHalStatus status = eHAL_STATUS_SUCCESS;
    struct net_device *dev = (struct net_device *) pContext;
    union iwreq_data wrqu;
    char buffer[IW_CUSTOM_MAX+1];

    memset(&wrqu, '\0', sizeof(wrqu));
    memset(buffer, '\0', sizeof(buffer));

    //now if the status is success, then send an event up
    //so that the application can request for the data
    //else no need to send the event up
    if(oemDataReqStatus == eOEM_DATA_REQ_FAILURE)
    {
        snprintf(buffer, IW_CUSTOM_MAX, "QCOM: OEM-DATA-REQ-FAILED");
        hddLog(LOGW, "%s: oem data req %d failed", __func__, oemDataReqID);
    }
    else if(oemDataReqStatus == eOEM_DATA_REQ_INVALID_MODE)
    {
        snprintf(buffer, IW_CUSTOM_MAX, "QCOM: OEM-DATA-REQ-INVALID-MODE");
        hddLog(LOGW, "%s: oem data req %d failed because the driver is in invalid mode (IBSS|BTAMP|AP)", __func__, oemDataReqID);
    }
    else
    {
        snprintf(buffer, IW_CUSTOM_MAX, "QCOM: OEM-DATA-REQ-SUCCESS");
        //everything went alright
    }
    
    wrqu.data.pointer = buffer;
    wrqu.data.length = strlen(buffer);
        
    wireless_send_event(dev, IWEVCUSTOM, &wrqu, buffer);

    return status;
}

/**--------------------------------------------------------------------------------------------

  \brief __iw_get_oem_data_rsp() -

  This function gets the oem data response. This invokes
  the respective sme functionality. Function for handling the oem data rsp 
  IOCTL 

  \param - dev  - Pointer to the net device
         - info - Pointer to the iw_oem_data_req
         - wrqu - Pointer to the iwreq data
         - extra - Pointer to the data

  \return - 0 for success, non zero for failure

-----------------------------------------------------------------------------------------------*/
int __iw_get_oem_data_rsp(
        struct net_device *dev,
        struct iw_request_info *info,
        union iwreq_data *wrqu,
        char *extra)
{
    int                                   rc = 0;
    eHalStatus                            status;
    struct iw_oem_data_rsp*               pHddOemDataRsp;
    tOemDataRsp*                          pSmeOemDataRsp;
    hdd_adapter_t *pAdapter;
    hdd_context_t *pHddCtx;

    ENTER();
    pAdapter = (netdev_priv(dev));
    if (NULL == pAdapter)
    {
        VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                  "%s: Adapter is NULL",__func__);
        return -EINVAL;
    }
    pHddCtx = WLAN_HDD_GET_CTX(pAdapter);
    rc = wlan_hdd_validate_context(pHddCtx);
    if (0 != rc)
    {
        return rc;
    }
    do
    {
        //get the oem data response from sme
        status = sme_getOemDataRsp(WLAN_HDD_GET_HAL_CTX(pAdapter), &pSmeOemDataRsp);
        if (status != eHAL_STATUS_SUCCESS)
        {
            hddLog(LOGE, "%s: failed in sme_getOemDataRsp", __func__);
            rc = -EIO;
            break;
        }
        else
        {
            if (pSmeOemDataRsp != NULL)
            {
                pHddOemDataRsp = (struct iw_oem_data_rsp*)(extra);
                vos_mem_copy(pHddOemDataRsp->oemDataRsp, pSmeOemDataRsp->oemDataRsp, OEM_DATA_RSP_SIZE); 
            }
            else
            {
                hddLog(LOGE, "%s: pSmeOemDataRsp = NULL", __func__);
                rc = -EIO;
                break;
            }
        }
    } while(0);

    EXIT();
    return rc;
}

int iw_get_oem_data_rsp(
        struct net_device *dev,
        struct iw_request_info *info,
        union iwreq_data *wrqu,
        char *extra)
{
    int ret;

    vos_ssr_protect(__func__);
    ret = __iw_get_oem_data_rsp(dev, info, wrqu, extra);
    vos_ssr_unprotect(__func__);

    return ret;
}

/**--------------------------------------------------------------------------------------------

  \brief __iw_set_oem_data_req() -

  This function sets the oem data req configuration. This invokes
  the respective sme oem data req functionality. Function for 
  handling the set IOCTL for the oem data req configuration

  \param - dev  - Pointer to the net device
     - info - Pointer to the iw_oem_data_req
     - wrqu - Pointer to the iwreq data
     - extra - Pointer to the data

  \return - 0 for success, non zero for failure

-----------------------------------------------------------------------------------------------*/
int __iw_set_oem_data_req(
        struct net_device *dev,
        struct iw_request_info *info,
        union iwreq_data *wrqu,
        char *extra)
{
    int rc = 0;
    eHalStatus status = eHAL_STATUS_SUCCESS;
    struct iw_oem_data_req *pOemDataReq = NULL;
    tOemDataReqConfig oemDataReqConfig;
    tANI_U32 oemDataReqID = 0;
    hdd_adapter_t *pAdapter;
    hdd_context_t *pHddCtx;
    hdd_wext_state_t *pwextBuf;

    ENTER();

    if (!capable(CAP_NET_ADMIN))
    {
        VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                  FL("permission check failed"));
        return -EPERM;
    }

    pAdapter = (netdev_priv(dev));
    if (NULL == pAdapter)
    {
       VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                 "%s: Adapter is NULL",__func__);
       return -EINVAL;
    }
    pHddCtx = WLAN_HDD_GET_CTX(pAdapter);
    rc = wlan_hdd_validate_context(pHddCtx);
    if (0 != rc)
    {
        return rc;
    }

    pwextBuf = WLAN_HDD_GET_WEXT_STATE_PTR(pAdapter);
    if (NULL == pwextBuf)
    {
        VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                  "%s: pwextBuf is NULL",__func__);
        return -EINVAL;
    }

    if (pHddCtx->isPnoEnable)
    {
        VOS_TRACE( VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
                   FL("pno scan in progress"));
        return -EBUSY;
    }

    do
    {
        if (NULL != wrqu->data.pointer)
        {
            pOemDataReq = (struct iw_oem_data_req *)wrqu->data.pointer;
        }

        if (pOemDataReq == NULL)
        {
            hddLog(LOGE, "in %s oemDataReq == NULL", __func__);
            rc = -EIO;
            break;
        }

        vos_mem_zero(&oemDataReqConfig, sizeof(tOemDataReqConfig));

        if (copy_from_user((&oemDataReqConfig)->oemDataReq,
                           pOemDataReq->oemDataReq, OEM_DATA_REQ_SIZE))
        {
            VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_FATAL,
                      "%s: copy_from_user() failed!", __func__);
            rc = -EFAULT;
            break;
        }

        status = sme_OemDataReq(WLAN_HDD_GET_HAL_CTX(pAdapter), 
                                                pAdapter->sessionId,
                                                &oemDataReqConfig, 
                                                &oemDataReqID, 
                                                &hdd_OemDataReqCallback, 
                                                dev);
        if (status != eHAL_STATUS_SUCCESS)
        {
            VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                      "%s: sme_OemDataReq status %d", __func__, status);
            rc = -EFAULT;
            break;
        }
    
        pwextBuf->oemDataReqID = oemDataReqID;
        pwextBuf->oemDataReqInProgress = TRUE;

    } while(0);

    EXIT();
    return rc;
}

int iw_set_oem_data_req(
        struct net_device *dev,
        struct iw_request_info *info,
        union iwreq_data *wrqu,
        char *extra)
{
    int ret;

    vos_ssr_protect(__func__);
    ret = __iw_set_oem_data_req(dev, info, wrqu, extra);
    vos_ssr_unprotect(__func__);

    return ret;
}

/**---------------------------------------------------------------------------

  \brief iw_get_oem_data_cap()

  This function gets the capability information for OEM Data Request
  and Response.

  \param - dev  - Pointer to the net device
         - info - Pointer to the t_iw_oem_data_cap
         - wrqu - Pointer to the iwreq data
         - extra - Pointer to the data

  \return - 0 for success, non zero for failure

----------------------------------------------------------------------------*/
int iw_get_oem_data_cap(
        struct net_device *dev,
        struct iw_request_info *info,
        union iwreq_data *wrqu,
        char *extra)
{
    eHalStatus status;
    t_iw_oem_data_cap oemDataCap;
    t_iw_oem_data_cap *pHddOemDataCap;
    hdd_adapter_t *pAdapter = netdev_priv(dev);
    hdd_context_t *pHddContext;
    hdd_config_t *pConfig;
    tANI_U32 numChannels;
    tANI_U8 chanList[OEM_CAP_MAX_NUM_CHANNELS];
    tANI_U32 i;
    int ret;

    ENTER();

    if (!pAdapter)
    {
       VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                 "%s:Invalid context, pAdapter is null", __func__);
       return -EINVAL;
    }

    pHddContext = WLAN_HDD_GET_CTX(pAdapter);
    ret = wlan_hdd_validate_context(pHddContext);
    if (0 != ret)
      return ret;

    pConfig = pHddContext->cfg_ini;

    do
    {
       vos_mem_zero(&oemDataCap, sizeof(oemDataCap));
       strlcpy(oemDataCap.oem_target_signature, OEM_TARGET_SIGNATURE,
               OEM_TARGET_SIGNATURE_LEN);
       oemDataCap.oem_target_type = TARGET_TYPE_PRONTO;
       oemDataCap.oem_fw_version = 0;
       oemDataCap.driver_version.major = QWLAN_VERSION_MAJOR;
       oemDataCap.driver_version.minor = QWLAN_VERSION_MINOR;
       oemDataCap.driver_version.patch = QWLAN_VERSION_PATCH;
       oemDataCap.driver_version.build = QWLAN_VERSION_BUILD;
       oemDataCap.allowed_dwell_time_min = pConfig->nNeighborScanMinChanTime;
       oemDataCap.allowed_dwell_time_max = pConfig->nNeighborScanMaxChanTime;
       oemDataCap.curr_dwell_time_min =
               sme_getNeighborScanMinChanTime(pHddContext->hHal);
       oemDataCap.curr_dwell_time_max =
               sme_getNeighborScanMaxChanTime(pHddContext->hHal);
       oemDataCap.supported_bands = pConfig->nBandCapability;

       /* request for max num of channels */
       numChannels = WNI_CFG_VALID_CHANNEL_LIST_LEN;
       status = sme_GetCfgValidChannels(pHddContext->hHal,
                                        &chanList[0],
                                        &numChannels);
       if (eHAL_STATUS_SUCCESS != status)
       {
         VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                   "%s:failed to get valid channel list", __func__);
         return -ENOENT;
       }
       else
       {
         /* make sure num channels is not more than chan list array */
         if (numChannels > OEM_CAP_MAX_NUM_CHANNELS)
         {
           VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                     "%s:Num of channels(%d) more than length(%d) of chanlist",
                     __func__, numChannels, OEM_CAP_MAX_NUM_CHANNELS);
           return -ENOMEM;
         }

         oemDataCap.num_channels = numChannels;
         for (i = 0; i < numChannels; i++)
         {
           oemDataCap.channel_list[i] = chanList[i];
         }
       }

       pHddOemDataCap = (t_iw_oem_data_cap *)(extra);
       vos_mem_copy(pHddOemDataCap, &oemDataCap, sizeof(*pHddOemDataCap));
    } while (0);

    EXIT();
    return 0;
}

/**---------------------------------------------------------------------------

  \brief send_oem_reg_rsp_nlink_msg() - send oem registration response

  This function sends oem message to registered application process

  \param -
     - none

  \return - none

  --------------------------------------------------------------------------*/
static void send_oem_reg_rsp_nlink_msg(void)
{
   struct sk_buff *skb;
   struct nlmsghdr *nlh;
   tAniMsgHdr *aniHdr;
   tANI_U8 *buf;
   tANI_U8 *numInterfaces;
   tANI_U8 *deviceMode;
   tANI_U8 *vdevId;
   hdd_adapter_list_node_t *pAdapterNode = NULL;
   hdd_adapter_list_node_t *pNext = NULL;
   hdd_adapter_t *pAdapter = NULL;
   VOS_STATUS status = 0;

   /* OEM message is always to a specific process and cannot be a broadcast */
   if (pHddCtx->oem_pid == 0)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: invalid dest pid", __func__);
      return;
   }

   skb = alloc_skb(NLMSG_SPACE(WLAN_NL_MAX_PAYLOAD), GFP_KERNEL);
   if (skb == NULL)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: alloc_skb failed", __func__);
      return;
   }

   nlh = (struct nlmsghdr *)skb->data;
   nlh->nlmsg_pid = 0;  /* from kernel */
   nlh->nlmsg_flags = 0;
   nlh->nlmsg_seq = 0;
   nlh->nlmsg_type = WLAN_NL_MSG_OEM;
   aniHdr = NLMSG_DATA(nlh);
   aniHdr->type = ANI_MSG_APP_REG_RSP;

   /* Fill message body:
    *   First byte will be number of interfaces, followed by
    *   two bytes for each interfaces
    *     - one byte for device mode
    *     - one byte for vdev id
    */
   buf = (char *) ((char *)aniHdr + sizeof(tAniMsgHdr));
   numInterfaces = buf++;
   *numInterfaces = 0;

   /* Iterate through each of the adapters and fill device mode and vdev id */
   status = hdd_get_front_adapter(pHddCtx, &pAdapterNode);
   while ((VOS_STATUS_SUCCESS == status) && pAdapterNode)
   {
     pAdapter = pAdapterNode->pAdapter;
     if (pAdapter)
     {
       deviceMode = buf++;
       vdevId = buf++;
       *deviceMode = pAdapter->device_mode;
       *vdevId = pAdapter->sessionId;
       (*numInterfaces)++;
       VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
                 "%s: numInterfaces: %d, deviceMode: %d, vdevId: %d",
                 __func__, *numInterfaces, *deviceMode, *vdevId);
     }
     status = hdd_get_next_adapter(pHddCtx, pAdapterNode, &pNext);
     pAdapterNode = pNext;
   }

   aniHdr->length = sizeof(tANI_U8) + (*numInterfaces) * 2 * sizeof(tANI_U8);
   nlh->nlmsg_len = NLMSG_LENGTH((sizeof(tAniMsgHdr) + aniHdr->length));

   skb_put(skb, NLMSG_SPACE((sizeof(tAniMsgHdr) + aniHdr->length)));

   VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
             "%s: sending App Reg Response length (%d) to process pid (%d)",
             __func__, aniHdr->length, pHddCtx->oem_pid);

   (void)nl_srv_ucast(skb, pHddCtx->oem_pid, MSG_DONTWAIT);

   return;
}

/**---------------------------------------------------------------------------

  \brief send_oem_err_rsp_nlink_msg() - send oem error response

  This function sends error response to oem app

  \param -
     - app_pid - PID of oem application process

  \return - none

  --------------------------------------------------------------------------*/
static void send_oem_err_rsp_nlink_msg(v_SINT_t app_pid, tANI_U8 error_code)
{
   struct sk_buff *skb;
   struct nlmsghdr *nlh;
   tAniMsgHdr *aniHdr;
   tANI_U8 *buf;

   skb = alloc_skb(NLMSG_SPACE(WLAN_NL_MAX_PAYLOAD), GFP_KERNEL);
   if (skb == NULL)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: alloc_skb failed", __func__);
      return;
   }

   nlh = (struct nlmsghdr *)skb->data;
   nlh->nlmsg_pid = 0;  /* from kernel */
   nlh->nlmsg_flags = 0;
   nlh->nlmsg_seq = 0;
   nlh->nlmsg_type = WLAN_NL_MSG_OEM;
   aniHdr = NLMSG_DATA(nlh);
   aniHdr->type = ANI_MSG_OEM_ERROR;
   aniHdr->length = sizeof(tANI_U8);
   nlh->nlmsg_len = NLMSG_LENGTH(sizeof(tAniMsgHdr) + aniHdr->length);

   /* message body will contain one byte of error code */
   buf = (char *) ((char *) aniHdr + sizeof(tAniMsgHdr));
   *buf = error_code;

   skb_put(skb, NLMSG_SPACE(sizeof(tAniMsgHdr) + aniHdr->length));

   VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
             "%s: sending oem error response to process pid (%d)",
             __func__, app_pid);

   (void)nl_srv_ucast(skb, app_pid, MSG_DONTWAIT);

   return;
}

/**---------------------------------------------------------------------------

  \brief send_oem_data_rsp_msg() - send oem data response

  This function sends oem data rsp message to registered application process
  over the netlink socket.

  \param -
     - oemDataRsp - Pointer to OEM Data Response struct

  \return - 0 for success, non zero for failure

  --------------------------------------------------------------------------*/
void send_oem_data_rsp_msg(tANI_U32 length, tANI_U8 *oemDataRsp)
{
   struct sk_buff *skb;
   struct nlmsghdr *nlh;
   tAniMsgHdr *aniHdr;
   tANI_U8 *oemData;

   /* OEM message is always to a specific process and cannot be a broadcast */
   if (pHddCtx->oem_pid == 0)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: invalid dest pid", __func__);
      return;
   }

   if (length > NEW_OEM_DATA_RSP_SIZE)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: invalid length of Oem Data response", __func__);
      return;
   }

   skb = alloc_skb(NLMSG_SPACE(sizeof(tAniMsgHdr) + length),
                   GFP_KERNEL);
   if (skb == NULL)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: alloc_skb failed", __func__);
      return;
   }

   nlh = (struct nlmsghdr *)skb->data;
   nlh->nlmsg_pid = 0;  /* from kernel */
   nlh->nlmsg_flags = 0;
   nlh->nlmsg_seq = 0;
   nlh->nlmsg_type = WLAN_NL_MSG_OEM;
   aniHdr = NLMSG_DATA(nlh);
   aniHdr->type = ANI_MSG_OEM_DATA_RSP;

   aniHdr->length = length;
   nlh->nlmsg_len = NLMSG_LENGTH((sizeof(tAniMsgHdr) + aniHdr->length));
   oemData = (tANI_U8 *) ((char *)aniHdr + sizeof(tAniMsgHdr));
   vos_mem_copy(oemData, oemDataRsp, length);

   skb_put(skb, NLMSG_SPACE((sizeof(tAniMsgHdr) + aniHdr->length)));

   VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
             "%s: sending Oem Data Response of len (%d) to process pid (%d)",
             __func__, length, pHddCtx->oem_pid);

   (void)nl_srv_ucast(skb, pHddCtx->oem_pid, MSG_DONTWAIT);

   return;
}

/**---------------------------------------------------------------------------

  \brief oem_process_channel_info_req_msg() - process oem channel_info request

  This function responds with channel info to oem process

  \param -
     - numOfChannels - number of channels
     - chanList - channel list

  \return - 0 for success, non zero for failure

  --------------------------------------------------------------------------*/
static int oem_process_channel_info_req_msg(int numOfChannels, char *chanList)
{
   struct sk_buff *skb;
   struct nlmsghdr *nlh;
   tAniMsgHdr *aniHdr;
   tHddChannelInfo *pHddChanInfo;
   tHddChannelInfo hddChanInfo;
   tANI_U8 chanId;
   tANI_U32 reg_info_1;
   tANI_U32 reg_info_2;
   eHalStatus status = eHAL_STATUS_FAILURE;
   int i;
   tANI_U8 *buf;

   /* OEM message is always to a specific process and cannot be a broadcast */
   if (pHddCtx->oem_pid == 0)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: invalid dest pid", __func__);
      return -1;
   }

   skb = alloc_skb(NLMSG_SPACE(sizeof(tAniMsgHdr) + sizeof(tANI_U8) +
                   numOfChannels * sizeof(tHddChannelInfo)), GFP_KERNEL);
   if (skb == NULL)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: alloc_skb failed", __func__);
      return -1;
   }

   nlh = (struct nlmsghdr *)skb->data;
   nlh->nlmsg_pid = 0;  /* from kernel */
   nlh->nlmsg_flags = 0;
   nlh->nlmsg_seq = 0;
   nlh->nlmsg_type = WLAN_NL_MSG_OEM;
   aniHdr = NLMSG_DATA(nlh);
   aniHdr->type = ANI_MSG_CHANNEL_INFO_RSP;

   aniHdr->length = sizeof(tANI_U8) + numOfChannels * sizeof(tHddChannelInfo);
   nlh->nlmsg_len = NLMSG_LENGTH((sizeof(tAniMsgHdr) + aniHdr->length));

   /* First byte of message body will have num of channels */
   buf = (char *) ((char *)aniHdr + sizeof(tAniMsgHdr));
   *buf++ = numOfChannels;

   /* Next follows channel info struct for each channel id.
       * If chan id is wrong or SME returns failure for a channel
       * then fill in 0 in channel info for that particular channel
       */
   for (i = 0 ; i < numOfChannels; i++)
   {
      pHddChanInfo = (tHddChannelInfo *) ((char *) buf +
                                        i * sizeof(tHddChannelInfo));

      chanId = chanList[i];
      status = sme_getRegInfo(pHddCtx->hHal, chanId,
                              &reg_info_1, &reg_info_2);
      if (eHAL_STATUS_SUCCESS == status)
      {
         /* band center freq1, and freq2 depends on peer's capability
                  * and at this time we might not be associated on the given
                  * channel, so fill freq1=mhz, and freq2=0
                  */
         hddChanInfo.chan_id = chanId;
         hddChanInfo.reserved0 = 0;
         hddChanInfo.mhz = vos_chan_to_freq(chanId);
         hddChanInfo.band_center_freq1 = hddChanInfo.mhz;
         hddChanInfo.band_center_freq2 = 0;

         /* set only DFS flag in info, rest of the fields will be filled in
                 *  by the OEM App
                 */
         hddChanInfo.info = 0;
         if (NV_CHANNEL_DFS == vos_nv_getChannelEnabledState(chanId))
             hddChanInfo.info |= (1 << WLAN_HAL_CHAN_FLAG_DFS);

         hddChanInfo.reg_info_1 = reg_info_1;
         hddChanInfo.reg_info_2 = reg_info_2;
      }
      else
      {
         /* chanId passed to sme_getRegInfo is not valid, fill in zeros
                  * in channel info struct
                  */
         VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
                   "%s: sme_getRegInfo failed for chan (%d), return info 0",
                   __func__, chanId);
         hddChanInfo.chan_id = chanId;
         hddChanInfo.reserved0 = 0;
         hddChanInfo.mhz = 0;
         hddChanInfo.band_center_freq1 = 0;
         hddChanInfo.band_center_freq2 = 0;
         hddChanInfo.info = 0;
         hddChanInfo.reg_info_1 = 0;
         hddChanInfo.reg_info_2 = 0;
      }
      vos_mem_copy(pHddChanInfo, &hddChanInfo, sizeof(tHddChannelInfo));
   }

   skb_put(skb, NLMSG_SPACE((sizeof(tAniMsgHdr) + aniHdr->length)));

   VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
             "%s: sending channel info resp for num channels (%d) to pid (%d)",
             __func__, numOfChannels, pHddCtx->oem_pid);

   (void)nl_srv_ucast(skb, pHddCtx->oem_pid, MSG_DONTWAIT);

   return 0;
}

/**---------------------------------------------------------------------------

  \brief oem_process_data_req_msg() - process oem data request

  This function sends oem message to SME

  \param -
     - oemDataLen - Length to OEM Data buffer
     - oemData - Pointer to OEM Data buffer

  \return - eHalStatus enumeration

  --------------------------------------------------------------------------*/
void oem_process_data_req_msg(int oemDataLen, char *oemData)
{
   tOemDataReqNewConfig oemDataReqNewConfig;
   hdd_adapter_t *pAdapter = NULL;

   /* for now, STA interface only */
   pAdapter = hdd_get_adapter(pHddCtx, WLAN_HDD_INFRA_STATION);
   if (!pAdapter)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: No adapter for STA mode", __func__);
      return;
   }

   if (!oemData)
   {
      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
                "%s: oemData is null", __func__);
      return;
   }

   vos_mem_zero(&oemDataReqNewConfig, sizeof(tOemDataReqNewConfig));
   vos_mem_copy(&oemDataReqNewConfig.selfMacAddr,
                pAdapter->macAddressCurrent.bytes, sizeof(tSirMacAddr));
   vos_mem_copy(&oemDataReqNewConfig.oemDataReqNew, oemData, oemDataLen);

   VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
             "selfMacAddr: " MAC_ADDRESS_STR" ",
              MAC_ADDR_ARRAY(oemDataReqNewConfig.selfMacAddr));

   sme_OemDataReqNew(pHddCtx->hHal,
                           &oemDataReqNewConfig);
}

/*
 * Callback function invoked by Netlink service for all netlink
 * messages (from user space) addressed to WLAN_NL_MSG_OEM
 */

/**
 * oem_msg_callback() - callback invoked by netlink service
 * @skb:    skb with netlink message
 *
 * This function gets invoked by netlink service when a message
 * is received from user space addressed to WLAN_NL_MSG_OEM
 *
 * Return: zero on success
 *         On error, error number will be returned.
 */
static int oem_msg_callback(struct sk_buff *skb)
{
   struct nlmsghdr *nlh;
   tAniMsgHdr *msg_hdr;
   int ret;
   char *sign_str = NULL;
   char* aniMsgBody;
   tANI_U32 *oemMsgSubType;

   nlh = (struct nlmsghdr *)skb->data;

   if (!nlh) {
       hddLog(LOGE, FL("Netlink header null"));
       return -EPERM;
   }

   ret = wlan_hdd_validate_context(pHddCtx);
   if (0 != ret) {
       hddLog(LOGE, FL("HDD context is not valid"));
       return ret;
   }

   msg_hdr = NLMSG_DATA(nlh);

   if (!msg_hdr) {
       hddLog(LOGE, FL("Message header null"));
       send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid, OEM_ERR_NULL_MESSAGE_HEADER);
       return -EPERM;
   }

   if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(tAniMsgHdr) + msg_hdr->length)) {
       hddLog(LOGE, FL("Invalid nl msg len, nlh->nlmsg_len (%d), msg_hdr->len (%d)"),
              nlh->nlmsg_len, msg_hdr->length);
       send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid,
                                  OEM_ERR_INVALID_MESSAGE_LENGTH);
       return -EPERM;
   }

   hddLog(LOG1, FL("Received App msg type: %d"), msg_hdr->type);

   switch (msg_hdr->type) {
   case ANI_MSG_APP_REG_REQ:
      /* Registration request is only allowed for Qualcomm Application */
      hddLog(LOG1, FL("Received App Req Req from App process pid(%d), len(%d)"),
                   nlh->nlmsg_pid, msg_hdr->length);

      sign_str = (char *)((char *)msg_hdr + sizeof(tAniMsgHdr));
      if ((OEM_APP_SIGNATURE_LEN == msg_hdr->length) &&
          (0 == strncmp(sign_str, OEM_APP_SIGNATURE_STR,
                        OEM_APP_SIGNATURE_LEN))) {
          hddLog(LOG1, FL("Valid App Req Req from oem app process pid(%d)"),
                       nlh->nlmsg_pid);

          pHddCtx->oem_app_registered = TRUE;
          pHddCtx->oem_pid = nlh->nlmsg_pid;
          send_oem_reg_rsp_nlink_msg();
      } else {
          hddLog(LOGE, FL("Invalid signature in App Reg Request from pid(%d)"),
                 nlh->nlmsg_pid);
          send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid,
                                       OEM_ERR_INVALID_SIGNATURE);
          return -EPERM;
      }
      break;

   case ANI_MSG_OEM_DATA_REQ:
      hddLog(LOG1, FL("Received Oem Data Request length(%d) from pid: %d"),
                   msg_hdr->length, nlh->nlmsg_pid);

      if ((!pHddCtx->oem_app_registered) ||
          (nlh->nlmsg_pid != pHddCtx->oem_pid)) {
          /* either oem app is not registered yet or pid is different */
          hddLog(LOGE, FL("OEM DataReq: app not registered(%d) or incorrect pid(%d)"),
                 pHddCtx->oem_app_registered, nlh->nlmsg_pid);
          send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid,
                                       OEM_ERR_APP_NOT_REGISTERED);
          return -EPERM;
      }

      if ((!msg_hdr->length) || (OEM_DATA_REQ_SIZE < msg_hdr->length)) {
          hddLog(LOGE, FL("Invalid length (%d) in Oem Data Request"),
                       msg_hdr->length);
          send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid,
                                       OEM_ERR_INVALID_MESSAGE_LENGTH);
          return -EPERM;
      }
      aniMsgBody = (char *)((char *)msg_hdr + sizeof(tAniMsgHdr));
      oemMsgSubType = (tANI_U32*) aniMsgBody;
      hddLog(LOG1, FL("oemMsgSubType: 0x%x"), *oemMsgSubType);

      oem_process_data_req_msg(msg_hdr->length,
                              (char *) ((char *)msg_hdr +
                              sizeof(tAniMsgHdr)));
      break;

   case ANI_MSG_CHANNEL_INFO_REQ:
      hddLog(LOG1,
             FL("Received channel info request, num channel(%d) from pid: %d"),
             msg_hdr->length, nlh->nlmsg_pid);

      if ((!pHddCtx->oem_app_registered) ||
          (nlh->nlmsg_pid != pHddCtx->oem_pid)) {
          /* either oem app is not registered yet or pid is different */
          hddLog(LOGE,
                 FL("Chan InfoReq: app not registered(%d) or incorrect pid(%d)"),
                 pHddCtx->oem_app_registered, nlh->nlmsg_pid);
          send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid,
                                     OEM_ERR_APP_NOT_REGISTERED);
          return -EPERM;
      }

      /* message length contains list of channel ids */
      if ((!msg_hdr->length) ||
          (WNI_CFG_VALID_CHANNEL_LIST_LEN < msg_hdr->length)) {
          hddLog(LOGE,
                 FL("Invalid length (%d) in channel info request"),
                 msg_hdr->length);
          send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid,
                                    OEM_ERR_INVALID_MESSAGE_LENGTH);
          return -EPERM;
      }
      oem_process_channel_info_req_msg(msg_hdr->length,
                            (char *)((char*)msg_hdr + sizeof(tAniMsgHdr)));
      break;

   default:
      hddLog(LOGE,
             FL("Received Invalid message type (%d), length (%d)"),
             msg_hdr->type, msg_hdr->length);
      send_oem_err_rsp_nlink_msg(nlh->nlmsg_pid,
                                 OEM_ERR_INVALID_MESSAGE_TYPE);
      return -EPERM;
   }
   return 0;
}

static int __oem_msg_callback(struct sk_buff *skb)
{
    int ret;

    vos_ssr_protect(__func__);
    ret = oem_msg_callback(skb);
    vos_ssr_unprotect(__func__);

    return ret;
}

/**---------------------------------------------------------------------------

  \brief oem_activate_service() - Activate oem message handler

  This function registers a handler to receive netlink message from
  an OEM application process.

  \param -
     - pAdapter - pointer to HDD adapter

  \return - 0 for success, non zero for failure

  --------------------------------------------------------------------------*/
int oem_activate_service(void *pAdapter)
{
   pHddCtx = (struct hdd_context_s*) pAdapter;

   /* Register the msg handler for msgs addressed to WLAN_NL_MSG_OEM */
   nl_srv_register(WLAN_NL_MSG_OEM, __oem_msg_callback);
   return 0;
}

/**---------------------------------------------------------------------------

  \brief oem_deactivate_service() - Deactivate oem message handler

  This function unregisters a handler to receive netlink message from
  an OEM application process.

  \return - none
  --------------------------------------------------------------------------*/
void oem_deactivate_service()
{
   /* unregister the msg handler for msgs addressed to WLAN_NL_MSG_OEM */
   nl_srv_unregister(WLAN_NL_MSG_OEM, __oem_msg_callback);
}


#endif