drivers/staging/wlan-ng/p80211req.c

   1 /* src/p80211/p80211req.c
   2  *
   3  * Request/Indication/MacMgmt interface handling functions
   4  *
   5  * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
   6  * --------------------------------------------------------------------
   7  *
   8  * linux-wlan
   9  *
  10  *   The contents of this file are subject to the Mozilla Public
  11  *   License Version 1.1 (the "License"); you may not use this file
  12  *   except in compliance with the License. You may obtain a copy of
  13  *   the License at http://www.mozilla.org/MPL/
  14  *
  15  *   Software distributed under the License is distributed on an "AS
  16  *   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  17  *   implied. See the License for the specific language governing
  18  *   rights and limitations under the License.
  19  *
  20  *   Alternatively, the contents of this file may be used under the
  21  *   terms of the GNU Public License version 2 (the "GPL"), in which
  22  *   case the provisions of the GPL are applicable instead of the
  23  *   above.  If you wish to allow the use of your version of this file
  24  *   only under the terms of the GPL and not to allow others to use
  25  *   your version of this file under the MPL, indicate your decision
  26  *   by deleting the provisions above and replace them with the notice
  27  *   and other provisions required by the GPL.  If you do not delete
  28  *   the provisions above, a recipient may use your version of this
  29  *   file under either the MPL or the GPL.
  30  *
  31  * --------------------------------------------------------------------
  32  *
  33  * Inquiries regarding the linux-wlan Open Source project can be
  34  * made directly to:
  35  *
  36  * AbsoluteValue Systems Inc.
  37  * info@linux-wlan.com
  38  * http://www.linux-wlan.com
  39  *
  40  * --------------------------------------------------------------------
  41  *
  42  * Portions of the development of this software were funded by
  43  * Intersil Corporation as part of PRISM(R) chipset product development.
  44  *
  45  * --------------------------------------------------------------------
  46  *
  47  * This file contains the functions, types, and macros to support the
  48  * MLME request interface that's implemented via the device ioctls.
  49  *
  50  * --------------------------------------------------------------------
  51  */
  52
  53 #include <linux/module.h>
  54 #include <linux/kernel.h>
  55 #include <linux/sched.h>
  56 #include <linux/types.h>
  57 #include <linux/skbuff.h>
  58 #include <linux/wireless.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/etherdevice.h>
  61 #include <net/sock.h>
  62 #include <linux/netlink.h>
  63
  64 #include "p80211types.h"
  65 #include "p80211hdr.h"
  66 #include "p80211mgmt.h"
  67 #include "p80211conv.h"
  68 #include "p80211msg.h"
  69 #include "p80211netdev.h"
  70 #include "p80211ioctl.h"
  71 #include "p80211metadef.h"
  72 #include "p80211metastruct.h"
  73 #include "p80211req.h"
  74
  75 static void p80211req_handlemsg(struct wlandevice *wlandev,
  76                                 struct p80211msg *msg);
  77 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
  78                                     struct p80211msg_dot11req_mibget *mib_msg,
  79                                     int isget);
  80
  81 static void p80211req_handle_action(struct wlandevice *wlandev, u32 *data,
  82                                     int isget, u32 flag)
  83 {
  84         if (isget) {
  85                 if (wlandev->hostwep & flag)
  86                         *data = P80211ENUM_truth_true;
  87                 else
  88                         *data = P80211ENUM_truth_false;
  89         } else {
  90                 wlandev->hostwep &= ~flag;
  91                 if (*data == P80211ENUM_truth_true)
  92                         wlandev->hostwep |= flag;
  93         }
  94 }
  95
  96 /*----------------------------------------------------------------
  97  * p80211req_dorequest
  98  *
  99  * Handles an MLME request/confirm message.
 100  *
 101  * Arguments:
 102  *      wlandev         WLAN device struct
 103  *      msgbuf          Buffer containing a request message
 104  *
 105  * Returns:
 106  *      0 on success, an errno otherwise
 107  *
 108  * Call context:
 109  *      Potentially blocks the caller, so it's a good idea to
 110  *      not call this function from an interrupt context.
 111  *----------------------------------------------------------------
 112  */
 113 int p80211req_dorequest(struct wlandevice *wlandev, u8 *msgbuf)
 114 {
 115         struct p80211msg *msg = (struct p80211msg *)msgbuf;
 116
 117         /* Check to make sure the MSD is running */
 118         if (!((wlandev->msdstate == WLAN_MSD_HWPRESENT &&
 119                msg->msgcode == DIDmsg_lnxreq_ifstate) ||
 120               wlandev->msdstate == WLAN_MSD_RUNNING ||
 121               wlandev->msdstate == WLAN_MSD_FWLOAD)) {
 122                 return -ENODEV;
 123         }
 124
 125         /* Check Permissions */
 126         if (!capable(CAP_NET_ADMIN) &&
 127             (msg->msgcode != DIDmsg_dot11req_mibget)) {
 128                 netdev_err(wlandev->netdev,
 129                            "%s: only dot11req_mibget allowed for non-root.\n",
 130                            wlandev->name);
 131                 return -EPERM;
 132         }
 133
 134         /* Check for busy status */
 135         if (test_and_set_bit(1, &wlandev->request_pending))
 136                 return -EBUSY;
 137
 138         /* Allow p80211 to look at msg and handle if desired. */
 139         /* So far, all p80211 msgs are immediate, no waitq/timer necessary */
 140         /* This may change. */
 141         p80211req_handlemsg(wlandev, msg);
 142
 143         /* Pass it down to wlandev via wlandev->mlmerequest */
 144         if (wlandev->mlmerequest)
 145                 wlandev->mlmerequest(wlandev, msg);
 146
 147         clear_bit(1, &wlandev->request_pending);
 148         return 0;       /* if result==0, msg->status still may contain an err */
 149 }
 150
 151 /*----------------------------------------------------------------
 152  * p80211req_handlemsg
 153  *
 154  * p80211 message handler.  Primarily looks for messages that
 155  * belong to p80211 and then dispatches the appropriate response.
 156  * TODO: we don't do anything yet.  Once the linuxMIB is better
 157  *      defined we'll need a get/set handler.
 158  *
 159  * Arguments:
 160  *      wlandev         WLAN device struct
 161  *      msg             message structure
 162  *
 163  * Returns:
 164  *      nothing (any results are set in the status field of the msg)
 165  *
 166  * Call context:
 167  *      Process thread
 168  *----------------------------------------------------------------
 169  */
 170 static void p80211req_handlemsg(struct wlandevice *wlandev,
 171                                 struct p80211msg *msg)
 172 {
 173         switch (msg->msgcode) {
 174         case DIDmsg_lnxreq_hostwep:{
 175                 struct p80211msg_lnxreq_hostwep *req =
 176                         (struct p80211msg_lnxreq_hostwep *)msg;
 177                 wlandev->hostwep &=
 178                                 ~(HOSTWEP_DECRYPT | HOSTWEP_ENCRYPT);
 179                 if (req->decrypt.data == P80211ENUM_truth_true)
 180                         wlandev->hostwep |= HOSTWEP_DECRYPT;
 181                 if (req->encrypt.data == P80211ENUM_truth_true)
 182                         wlandev->hostwep |= HOSTWEP_ENCRYPT;
 183
 184         break;
 185         }
 186         case DIDmsg_dot11req_mibget:
 187         case DIDmsg_dot11req_mibset:{
 188                 int isget = (msg->msgcode == DIDmsg_dot11req_mibget);
 189                 struct p80211msg_dot11req_mibget *mib_msg =
 190                         (struct p80211msg_dot11req_mibget *)msg;
 191                 p80211req_mibset_mibget(wlandev, mib_msg, isget);
 192         break;
 193         }
 194         }                       /* switch msg->msgcode */
 195 }
 196
 197 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
 198                                     struct p80211msg_dot11req_mibget *mib_msg,
 199                                     int isget)
 200 {
 201         struct p80211itemd *mibitem =
 202                 (struct p80211itemd *)mib_msg->mibattribute.data;
 203         struct p80211pstrd *pstr = (struct p80211pstrd *)mibitem->data;
 204         u8 *key = mibitem->data + sizeof(struct p80211pstrd);
 205
 206         switch (mibitem->did) {
 207         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(1):
 208         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(2):
 209         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(3):
 210         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(4):
 211                 if (!isget)
 212                         wep_change_key(wlandev,
 213                                        P80211DID_ITEM(mibitem->did) - 1,
 214                                        key, pstr->len);
 215                 break;
 216
 217         case DIDmib_dot11smt_dot11PrivacyTable_dot11WEPDefaultKeyID:{
 218                 u32 *data = (u32 *)mibitem->data;
 219
 220                 if (isget) {
 221                         *data = wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK;
 222                 } else {
 223                         wlandev->hostwep &= ~(HOSTWEP_DEFAULTKEY_MASK);
 224                         wlandev->hostwep |= (*data & HOSTWEP_DEFAULTKEY_MASK);
 225                 }
 226         break;
 227         }
 228         case DIDmib_dot11smt_dot11PrivacyTable_dot11PrivacyInvoked:{
 229                 u32 *data = (u32 *)mibitem->data;
 230
 231                 p80211req_handle_action(wlandev, data, isget,
 232                                         HOSTWEP_PRIVACYINVOKED);
 233         break;
 234         }
 235         case DIDmib_dot11smt_dot11PrivacyTable_dot11ExcludeUnencrypted:{
 236                 u32 *data = (u32 *)mibitem->data;
 237
 238                 p80211req_handle_action(wlandev, data, isget,
 239                                         HOSTWEP_EXCLUDEUNENCRYPTED);
 240         break;
 241         }
 242         }
 243 }