p80211req.c

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/* 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.
* [email protected]
* 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(wlandevice_t *wlandev, struct p80211msg *msg);
static void p80211req_mibset_mibget(wlandevice_t *wlandev,
                   struct p80211msg_dot11req_mibget *mib_msg,
                   int isget);

/*----------------------------------------------------------------
* p80211req_dorequest
*
* Handles an MLME reqest/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(wlandevice_t *wlandev, u8 *msgbuf)
{
    int result = 0;
    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)) {
        printk(KERN_ERR
               "%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 != NULL)
        wlandev->mlmerequest(wlandev, msg);

    clear_bit(1, &(wlandev->request_pending));
    return result;  /* 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(wlandevice_t *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(wlandevice_t *wlandev,
                   struct p80211msg_dot11req_mibget *mib_msg,
                   int isget)
{
    p80211itemd_t *mibitem = (p80211itemd_t *) mib_msg->mibattribute.data;
    p80211pstrd_t *pstr = (p80211pstrd_t *) mibitem->data;
    u8 *key = mibitem->data + sizeof(p80211pstrd_t);

    switch (mibitem->did) {
    case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey0:{
        if (!isget)
            wep_change_key(wlandev, 0, key, pstr->len);
    break;
    }
    case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey1:{
        if (!isget)
            wep_change_key(wlandev, 1, key, pstr->len);
    break;
    }
    case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey2:{
        if (!isget)
            wep_change_key(wlandev, 2, key, pstr->len);
    break;
    }
    case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey3:{
        if (!isget)
            wep_change_key(wlandev, 3, key, pstr->len);
    break;
    }
    case DIDmib_dot11smt_dot11PrivacyTable_dot11WEPDefaultKeyID:{
        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_dot11PrivacyTable_dot11PrivacyInvoked:{
        u32 *data = (u32 *) mibitem->data;

        if (isget) {
            if (wlandev->hostwep & HOSTWEP_PRIVACYINVOKED)
                *data = P80211ENUM_truth_true;
            else
                *data = P80211ENUM_truth_false;
        } else {
            wlandev->hostwep &= ~(HOSTWEP_PRIVACYINVOKED);
            if (*data == P80211ENUM_truth_true)
                wlandev->hostwep |= HOSTWEP_PRIVACYINVOKED;
        }
    break;
    }
    case DIDmib_dot11smt_dot11PrivacyTable_dot11ExcludeUnencrypted:{
        u32 *data = (u32 *) mibitem->data;

        if (isget) {
            if (wlandev->hostwep & HOSTWEP_EXCLUDEUNENCRYPTED)
                *data = P80211ENUM_truth_true;
            else
                *data = P80211ENUM_truth_false;
        } else {
            wlandev->hostwep &= ~(HOSTWEP_EXCLUDEUNENCRYPTED);
            if (*data == P80211ENUM_truth_true)
                wlandev->hostwep |= HOSTWEP_EXCLUDEUNENCRYPTED;
        }
    break;
    }
    }
}