drivers/staging/wlan-ng/p80211req.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
   2 /* src/p80211/p80211req.c
   3  *
   4  * Request/Indication/MacMgmt interface handling functions
   5  *
   6  * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
   7  * --------------------------------------------------------------------
   8  *
   9  * linux-wlan
  10  *
  11  *   The contents of this file are subject to the Mozilla Public
  12  *   License Version 1.1 (the "License"); you may not use this file
  13  *   except in compliance with the License. You may obtain a copy of
  14  *   the License at http://www.mozilla.org/MPL/
  15  *
  16  *   Software distributed under the License is distributed on an "AS
  17  *   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  18  *   implied. See the License for the specific language governing
  19  *   rights and limitations under the License.
  20  *
  21  *   Alternatively, the contents of this file may be used under the
  22  *   terms of the GNU Public License version 2 (the "GPL"), in which
  23  *   case the provisions of the GPL are applicable instead of the
  24  *   above.  If you wish to allow the use of your version of this file
  25  *   only under the terms of the GPL and not to allow others to use
  26  *   your version of this file under the MPL, indicate your decision
  27  *   by deleting the provisions above and replace them with the notice
  28  *   and other provisions required by the GPL.  If you do not delete
  29  *   the provisions above, a recipient may use your version of this
  30  *   file under either the MPL or the GPL.
  31  *
  32  * --------------------------------------------------------------------
  33  *
  34  * Inquiries regarding the linux-wlan Open Source project can be
  35  * made directly to:
  36  *
  37  * AbsoluteValue Systems Inc.
  38  * info@linux-wlan.com
  39  * http://www.linux-wlan.com
  40  *
  41  * --------------------------------------------------------------------
  42  *
  43  * Portions of the development of this software were funded by
  44  * Intersil Corporation as part of PRISM(R) chipset product development.
  45  *
  46  * --------------------------------------------------------------------
  47  *
  48  * This file contains the functions, types, and macros to support the
  49  * MLME request interface that's implemented via the device ioctls.
  50  *
  51  * --------------------------------------------------------------------
  52  */
  53
  54 #include <linux/module.h>
  55 #include <linux/kernel.h>
  56 #include <linux/sched.h>
  57 #include <linux/types.h>
  58 #include <linux/skbuff.h>
  59 #include <linux/wireless.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/etherdevice.h>
  62 #include <net/sock.h>
  63 #include <linux/netlink.h>
  64
  65 #include "p80211types.h"
  66 #include "p80211hdr.h"
  67 #include "p80211mgmt.h"
  68 #include "p80211conv.h"
  69 #include "p80211msg.h"
  70 #include "p80211netdev.h"
  71 #include "p80211ioctl.h"
  72 #include "p80211metadef.h"
  73 #include "p80211metastruct.h"
  74 #include "p80211req.h"
  75
  76 static void p80211req_handlemsg(struct wlandevice *wlandev,
  77                                 struct p80211msg *msg);
  78 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
  79                                     struct p80211msg_dot11req_mibget *mib_msg,
  80                                     int isget);
  81
  82 static void p80211req_handle_action(struct wlandevice *wlandev, u32 *data,
  83                                     int isget, u32 flag)
  84 {
  85         if (isget) {
  86                 if (wlandev->hostwep & flag)
  87                         *data = P80211ENUM_truth_true;
  88                 else
  89                         *data = P80211ENUM_truth_false;
  90         } else {
  91                 wlandev->hostwep &= ~flag;
  92                 if (*data == P80211ENUM_truth_true)
  93                         wlandev->hostwep |= flag;
  94         }
  95 }
  96
  97 /*----------------------------------------------------------------
  98  * p80211req_dorequest
  99  *
 100  * Handles an MLME request/confirm message.
 101  *
 102  * Arguments:
 103  *      wlandev         WLAN device struct
 104  *      msgbuf          Buffer containing a request message
 105  *
 106  * Returns:
 107  *      0 on success, an errno otherwise
 108  *
 109  * Call context:
 110  *      Potentially blocks the caller, so it's a good idea to
 111  *      not call this function from an interrupt context.
 112  *----------------------------------------------------------------
 113  */
 114 int p80211req_dorequest(struct wlandevice *wlandev, u8 *msgbuf)
 115 {
 116         struct p80211msg *msg = (struct p80211msg *)msgbuf;
 117
 118         /* Check to make sure the MSD is running */
 119         if (!((wlandev->msdstate == WLAN_MSD_HWPRESENT &&
 120                msg->msgcode == DIDMSG_LNXREQ_IFSTATE) ||
 121               wlandev->msdstate == WLAN_MSD_RUNNING ||
 122               wlandev->msdstate == WLAN_MSD_FWLOAD)) {
 123                 return -ENODEV;
 124         }
 125
 126         /* Check Permissions */
 127         if (!capable(CAP_NET_ADMIN) &&
 128             (msg->msgcode != DIDMSG_DOT11REQ_MIBGET)) {
 129                 netdev_err(wlandev->netdev,
 130                            "%s: only dot11req_mibget allowed for non-root.\n",
 131                            wlandev->name);
 132                 return -EPERM;
 133         }
 134
 135         /* Check for busy status */
 136         if (test_and_set_bit(1, &wlandev->request_pending))
 137                 return -EBUSY;
 138
 139         /* Allow p80211 to look at msg and handle if desired. */
 140         /* So far, all p80211 msgs are immediate, no waitq/timer necessary */
 141         /* This may change. */
 142         p80211req_handlemsg(wlandev, msg);
 143
 144         /* Pass it down to wlandev via wlandev->mlmerequest */
 145         if (wlandev->mlmerequest)
 146                 wlandev->mlmerequest(wlandev, msg);
 147
 148         clear_bit(1, &wlandev->request_pending);
 149         return 0;       /* if result==0, msg->status still may contain an err */
 150 }
 151
 152 /*----------------------------------------------------------------
 153  * p80211req_handlemsg
 154  *
 155  * p80211 message handler.  Primarily looks for messages that
 156  * belong to p80211 and then dispatches the appropriate response.
 157  * TODO: we don't do anything yet.  Once the linuxMIB is better
 158  *      defined we'll need a get/set handler.
 159  *
 160  * Arguments:
 161  *      wlandev         WLAN device struct
 162  *      msg             message structure
 163  *
 164  * Returns:
 165  *      nothing (any results are set in the status field of the msg)
 166  *
 167  * Call context:
 168  *      Process thread
 169  *----------------------------------------------------------------
 170  */
 171 static void p80211req_handlemsg(struct wlandevice *wlandev,
 172                                 struct p80211msg *msg)
 173 {
 174         switch (msg->msgcode) {
 175         case DIDMSG_LNXREQ_HOSTWEP: {
 176                 struct p80211msg_lnxreq_hostwep *req =
 177                         (struct p80211msg_lnxreq_hostwep *)msg;
 178                 wlandev->hostwep &=
 179                                 ~(HOSTWEP_DECRYPT | HOSTWEP_ENCRYPT);
 180                 if (req->decrypt.data == P80211ENUM_truth_true)
 181                         wlandev->hostwep |= HOSTWEP_DECRYPT;
 182                 if (req->encrypt.data == P80211ENUM_truth_true)
 183                         wlandev->hostwep |= HOSTWEP_ENCRYPT;
 184
 185                 break;
 186         }
 187         case DIDMSG_DOT11REQ_MIBGET:
 188         case DIDMSG_DOT11REQ_MIBSET: {
 189                 int isget = (msg->msgcode == DIDMSG_DOT11REQ_MIBGET);
 190                 struct p80211msg_dot11req_mibget *mib_msg =
 191                         (struct p80211msg_dot11req_mibget *)msg;
 192                 p80211req_mibset_mibget(wlandev, mib_msg, isget);
 193                 break;
 194         }
 195         }                       /* switch msg->msgcode */
 196 }
 197
 198 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
 199                                     struct p80211msg_dot11req_mibget *mib_msg,
 200                                     int isget)
 201 {
 202         struct p80211itemd *mibitem =
 203                 (struct p80211itemd *)mib_msg->mibattribute.data;
 204         struct p80211pstrd *pstr = (struct p80211pstrd *)mibitem->data;
 205         u8 *key = mibitem->data + sizeof(struct p80211pstrd);
 206
 207         switch (mibitem->did) {
 208         case didmib_dot11smt_wepdefaultkeystable_key(1):
 209         case didmib_dot11smt_wepdefaultkeystable_key(2):
 210         case didmib_dot11smt_wepdefaultkeystable_key(3):
 211         case didmib_dot11smt_wepdefaultkeystable_key(4):
 212                 if (!isget)
 213                         wep_change_key(wlandev,
 214                                        P80211DID_ITEM(mibitem->did) - 1,
 215                                        key, pstr->len);
 216                 break;
 217
 218         case DIDMIB_DOT11SMT_PRIVACYTABLE_WEPDEFAULTKEYID: {
 219                 u32 *data = (u32 *)mibitem->data;
 220
 221                 if (isget) {
 222                         *data = wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK;
 223                 } else {
 224                         wlandev->hostwep &= ~(HOSTWEP_DEFAULTKEY_MASK);
 225                         wlandev->hostwep |= (*data & HOSTWEP_DEFAULTKEY_MASK);
 226                 }
 227                 break;
 228         }
 229         case DIDMIB_DOT11SMT_PRIVACYTABLE_PRIVACYINVOKED: {
 230                 u32 *data = (u32 *)mibitem->data;
 231
 232                 p80211req_handle_action(wlandev, data, isget,
 233                                         HOSTWEP_PRIVACYINVOKED);
 234                 break;
 235         }
 236         case DIDMIB_DOT11SMT_PRIVACYTABLE_EXCLUDEUNENCRYPTED: {
 237                 u32 *data = (u32 *)mibitem->data;
 238
 239                 p80211req_handle_action(wlandev, data, isget,
 240                                         HOSTWEP_EXCLUDEUNENCRYPTED);
 241                 break;
 242         }
 243         }
 244 }