// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
/* src/p80211/p80211req.c
 *
 * Request/Indication/MacMgmt interface handling functions
 *
 * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
 * --------------------------------------------------------------------
 *
 * linux-wlan
 *
 *   The contents of this file are subject to the Mozilla Public
 *   License Version 1.1 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.mozilla.org/MPL/
 *
 *   Software distributed under the License is distributed on an "AS
 *   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *   implied. See the License for the specific language governing
 *   rights and limitations under the License.
 *
 *   Alternatively, the contents of this file may be used under the
 *   terms of the GNU Public License version 2 (the "GPL"), in which
 *   case the provisions of the GPL are applicable instead of the
 *   above.  If you wish to allow the use of your version of this file
 *   only under the terms of the GPL and not to allow others to use
 *   your version of this file under the MPL, indicate your decision
 *   by deleting the provisions above and replace them with the notice
 *   and other provisions required by the GPL.  If you do not delete
 *   the provisions above, a recipient may use your version of this
 *   file under either the MPL or the GPL.
 *
 * --------------------------------------------------------------------
 *
 * Inquiries regarding the linux-wlan Open Source project can be
 * made directly to:
 *
 * AbsoluteValue Systems Inc.
 * info@linux-wlan.com
 * http://www.linux-wlan.com
 *
 * --------------------------------------------------------------------
 *
 * Portions of the development of this software were funded by
 * Intersil Corporation as part of PRISM(R) chipset product development.
 *
 * --------------------------------------------------------------------
 *
 * This file contains the functions, types, and macros to support the
 * MLME request interface that's implemented via the device ioctls.
 *
 * --------------------------------------------------------------------
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/wireless.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/sock.h>
#include <linux/netlink.h>

#include "p80211types.h"
#include "p80211hdr.h"
#include "p80211mgmt.h"
#include "p80211conv.h"
#include "p80211msg.h"
#include "p80211netdev.h"
#include "p80211ioctl.h"
#include "p80211metadef.h"
#include "p80211metastruct.h"
#include "p80211req.h"

static void p80211req_handlemsg(struct wlandevice *wlandev,
                                struct p80211msg *msg);
static void p80211req_mibset_mibget(struct wlandevice *wlandev,
                                    struct p80211msg_dot11req_mibget *mib_msg,
                                    int isget);

static void p80211req_handle_action(struct wlandevice *wlandev, u32 *data,
                                    int isget, u32 flag)
{
        if (isget) {
                if (wlandev->hostwep & flag)
                        *data = P80211ENUM_truth_true;
                else
                        *data = P80211ENUM_truth_false;
        } else {
                wlandev->hostwep &= ~flag;
                if (*data == P80211ENUM_truth_true)
                        wlandev->hostwep |= flag;
        }
}

/*----------------------------------------------------------------
 * p80211req_dorequest
 *
 * Handles an MLME request/confirm message.
 *
 * Arguments:
 *      wlandev         WLAN device struct
 *      msgbuf          Buffer containing a request message
 *
 * Returns:
 *      0 on success, an errno otherwise
 *
 * Call context:
 *      Potentially blocks the caller, so it's a good idea to
 *      not call this function from an interrupt context.
 *----------------------------------------------------------------
 */
int p80211req_dorequest(struct wlandevice *wlandev, u8 *msgbuf)
{
        struct p80211msg *msg = (struct p80211msg *)msgbuf;

        /* Check to make sure the MSD is running */
        if (!((wlandev->msdstate == WLAN_MSD_HWPRESENT &&
               msg->msgcode == DIDMSG_LNXREQ_IFSTATE) ||
              wlandev->msdstate == WLAN_MSD_RUNNING ||
              wlandev->msdstate == WLAN_MSD_FWLOAD)) {
                return -ENODEV;
        }

        /* Check Permissions */
        if (!capable(CAP_NET_ADMIN) &&
            (msg->msgcode != DIDMSG_DOT11REQ_MIBGET)) {
                netdev_err(wlandev->netdev,
                           "%s: only dot11req_mibget allowed for non-root.\n",
                           wlandev->name);
                return -EPERM;
        }

        /* Check for busy status */
        if (test_and_set_bit(1, &wlandev->request_pending))
                return -EBUSY;

        /* Allow p80211 to look at msg and handle if desired. */
        /* So far, all p80211 msgs are immediate, no waitq/timer necessary */
        /* This may change. */
        p80211req_handlemsg(wlandev, msg);

        /* Pass it down to wlandev via wlandev->mlmerequest */
        if (wlandev->mlmerequest)
                wlandev->mlmerequest(wlandev, msg);

        clear_bit(1, &wlandev->request_pending);
        return 0;       /* if result==0, msg->status still may contain an err */
}

/*----------------------------------------------------------------
 * p80211req_handlemsg
 *
 * p80211 message handler.  Primarily looks for messages that
 * belong to p80211 and then dispatches the appropriate response.
 * TODO: we don't do anything yet.  Once the linuxMIB is better
 *      defined we'll need a get/set handler.
 *
 * Arguments:
 *      wlandev         WLAN device struct
 *      msg             message structure
 *
 * Returns:
 *      nothing (any results are set in the status field of the msg)
 *
 * Call context:
 *      Process thread
 *----------------------------------------------------------------
 */
static void p80211req_handlemsg(struct wlandevice *wlandev,
                                struct p80211msg *msg)
{
        switch (msg->msgcode) {
        case DIDMSG_LNXREQ_HOSTWEP: {
                struct p80211msg_lnxreq_hostwep *req =
                        (struct p80211msg_lnxreq_hostwep *)msg;
                wlandev->hostwep &=
                                ~(HOSTWEP_DECRYPT | HOSTWEP_ENCRYPT);
                if (req->decrypt.data == P80211ENUM_truth_true)
                        wlandev->hostwep |= HOSTWEP_DECRYPT;
                if (req->encrypt.data == P80211ENUM_truth_true)
                        wlandev->hostwep |= HOSTWEP_ENCRYPT;

                break;
        }
        case DIDMSG_DOT11REQ_MIBGET:
        case DIDMSG_DOT11REQ_MIBSET: {
                int isget = (msg->msgcode == DIDMSG_DOT11REQ_MIBGET);
                struct p80211msg_dot11req_mibget *mib_msg =
                        (struct p80211msg_dot11req_mibget *)msg;
                p80211req_mibset_mibget(wlandev, mib_msg, isget);
                break;
        }
        }                       /* switch msg->msgcode */
}

static void p80211req_mibset_mibget(struct wlandevice *wlandev,
                                    struct p80211msg_dot11req_mibget *mib_msg,
                                    int isget)
{
        struct p80211itemd *mibitem =
                (struct p80211itemd *)mib_msg->mibattribute.data;
        struct p80211pstrd *pstr = (struct p80211pstrd *)mibitem->data;
        u8 *key = mibitem->data + sizeof(struct p80211pstrd);

        switch (mibitem->did) {
        case didmib_dot11smt_wepdefaultkeystable_key(1):
        case didmib_dot11smt_wepdefaultkeystable_key(2):
        case didmib_dot11smt_wepdefaultkeystable_key(3):
        case didmib_dot11smt_wepdefaultkeystable_key(4):
                if (!isget)
                        wep_change_key(wlandev,
                                       P80211DID_ITEM(mibitem->did) - 1,
                                       key, pstr->len);
                break;

        case DIDMIB_DOT11SMT_PRIVACYTABLE_WEPDEFAULTKEYID: {
                u32 *data = (u32 *)mibitem->data;

                if (isget) {
                        *data = wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK;
                } else {
                        wlandev->hostwep &= ~(HOSTWEP_DEFAULTKEY_MASK);
                        wlandev->hostwep |= (*data & HOSTWEP_DEFAULTKEY_MASK);
                }
                break;
        }
        case DIDMIB_DOT11SMT_PRIVACYTABLE_PRIVACYINVOKED: {
                u32 *data = (u32 *)mibitem->data;

                p80211req_handle_action(wlandev, data, isget,
                                        HOSTWEP_PRIVACYINVOKED);
                break;
        }
        case DIDMIB_DOT11SMT_PRIVACYTABLE_EXCLUDEUNENCRYPTED: {
                u32 *data = (u32 *)mibitem->data;

                p80211req_handle_action(wlandev, data, isget,
                                        HOSTWEP_EXCLUDEUNENCRYPTED);
                break;
        }
        }
}