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, struct p80211msg *msg);
  76 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
  77                                    struct p80211msg_dot11req_mibget *mib_msg,
  78                                    int isget);
  79
  80 static void p80211req_handle_action(struct wlandevice *wlandev, u32 *data,
  81                                     int isget, u32 flag)
  82 {
  83         if (isget) {
  84                 if (wlandev->hostwep & flag)
  85                         *data = P80211ENUM_truth_true;
  86                 else
  87                         *data = P80211ENUM_truth_false;
  88         } else {
  89                 wlandev->hostwep &= ~flag;
  90                 if (*data == P80211ENUM_truth_true)
  91                         wlandev->hostwep |= flag;
  92         }
  93 }
  94
  95 /*----------------------------------------------------------------
  96 * p80211req_dorequest
  97 *
  98 * Handles an MLME request/confirm message.
  99 *
 100 * Arguments:
 101 *       wlandev         WLAN device struct
 102 *       msgbuf          Buffer containing a request message
 103 *
 104 * Returns:
 105 *       0 on success, an errno otherwise
 106 *
 107 * Call context:
 108 *       Potentially blocks the caller, so it's a good idea to
 109 *       not call this function from an interrupt context.
 110 ----------------------------------------------------------------*/
 111 int p80211req_dorequest(struct wlandevice *wlandev, u8 *msgbuf)
 112 {
 113         struct p80211msg *msg = (struct p80211msg *)msgbuf;
 114
 115         /* Check to make sure the MSD is running */
 116         if (!((wlandev->msdstate == WLAN_MSD_HWPRESENT &&
 117                msg->msgcode == DIDmsg_lnxreq_ifstate) ||
 118               wlandev->msdstate == WLAN_MSD_RUNNING ||
 119               wlandev->msdstate == WLAN_MSD_FWLOAD)) {
 120                 return -ENODEV;
 121         }
 122
 123         /* Check Permissions */
 124         if (!capable(CAP_NET_ADMIN) &&
 125         (msg->msgcode != DIDmsg_dot11req_mibget)) {
 126                 netdev_err(wlandev->netdev,
 127                            "%s: only dot11req_mibget allowed for non-root.\n",
 128                            wlandev->name);
 129                 return -EPERM;
 130         }
 131
 132         /* Check for busy status */
 133         if (test_and_set_bit(1, &(wlandev->request_pending)))
 134                 return -EBUSY;
 135
 136         /* Allow p80211 to look at msg and handle if desired. */
 137         /* So far, all p80211 msgs are immediate, no waitq/timer necessary */
 138         /* This may change. */
 139         p80211req_handlemsg(wlandev, msg);
 140
 141         /* Pass it down to wlandev via wlandev->mlmerequest */
 142         if (wlandev->mlmerequest != NULL)
 143                 wlandev->mlmerequest(wlandev, msg);
 144
 145         clear_bit(1, &(wlandev->request_pending));
 146         return 0;       /* if result==0, msg->status still may contain an err */
 147 }
 148
 149 /*----------------------------------------------------------------
 150 * p80211req_handlemsg
 151 *
 152 * p80211 message handler.  Primarily looks for messages that
 153 * belong to p80211 and then dispatches the appropriate response.
 154 * TODO: we don't do anything yet.  Once the linuxMIB is better
 155 *       defined we'll need a get/set handler.
 156 *
 157 * Arguments:
 158 *       wlandev         WLAN device struct
 159 *       msg             message structure
 160 *
 161 * Returns:
 162 *       nothing (any results are set in the status field of the msg)
 163 *
 164 * Call context:
 165 *       Process thread
 166 ----------------------------------------------------------------*/
 167 static void p80211req_handlemsg(struct wlandevice *wlandev, struct p80211msg *msg)
 168 {
 169         switch (msg->msgcode) {
 170
 171         case DIDmsg_lnxreq_hostwep:{
 172                 struct p80211msg_lnxreq_hostwep *req =
 173                         (struct p80211msg_lnxreq_hostwep *)msg;
 174                 wlandev->hostwep &=
 175                                 ~(HOSTWEP_DECRYPT | HOSTWEP_ENCRYPT);
 176                 if (req->decrypt.data == P80211ENUM_truth_true)
 177                         wlandev->hostwep |= HOSTWEP_DECRYPT;
 178                 if (req->encrypt.data == P80211ENUM_truth_true)
 179                         wlandev->hostwep |= HOSTWEP_ENCRYPT;
 180
 181         break;
 182         }
 183         case DIDmsg_dot11req_mibget:
 184         case DIDmsg_dot11req_mibset:{
 185                 int isget = (msg->msgcode == DIDmsg_dot11req_mibget);
 186                 struct p80211msg_dot11req_mibget *mib_msg =
 187                         (struct p80211msg_dot11req_mibget *)msg;
 188                 p80211req_mibset_mibget(wlandev, mib_msg, isget);
 189         break;
 190         }
 191         }                       /* switch msg->msgcode */
 192 }
 193
 194 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
 195                                    struct p80211msg_dot11req_mibget *mib_msg,
 196                                    int isget)
 197 {
 198         struct p80211itemd *mibitem = (struct p80211itemd *)mib_msg->mibattribute.data;
 199         struct p80211pstrd *pstr = (struct p80211pstrd *)mibitem->data;
 200         u8 *key = mibitem->data + sizeof(struct p80211pstrd);
 201
 202         switch (mibitem->did) {
 203         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(1):
 204         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(2):
 205         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(3):
 206         case DIDmib_dot11smt_dot11WEPDefaultKeysTable_key(4):
 207                 if (!isget)
 208                         wep_change_key(wlandev,
 209                                        P80211DID_ITEM(mibitem->did) - 1,
 210                                        key, pstr->len);
 211                 break;
 212
 213         case DIDmib_dot11smt_dot11PrivacyTable_dot11WEPDefaultKeyID:{
 214                 u32 *data = (u32 *)mibitem->data;
 215
 216                 if (isget) {
 217                         *data = wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK;
 218                 } else {
 219                         wlandev->hostwep &= ~(HOSTWEP_DEFAULTKEY_MASK);
 220                         wlandev->hostwep |= (*data & HOSTWEP_DEFAULTKEY_MASK);
 221                 }
 222         break;
 223         }
 224         case DIDmib_dot11smt_dot11PrivacyTable_dot11PrivacyInvoked:{
 225                 u32 *data = (u32 *)mibitem->data;
 226
 227                 p80211req_handle_action(wlandev, data, isget,
 228                                         HOSTWEP_PRIVACYINVOKED);
 229         break;
 230         }
 231         case DIDmib_dot11smt_dot11PrivacyTable_dot11ExcludeUnencrypted:{
 232                 u32 *data = (u32 *)mibitem->data;
 233
 234                 p80211req_handle_action(wlandev, data, isget,
 235                                         HOSTWEP_EXCLUDEUNENCRYPTED);
 236         break;
 237         }
 238         }
 239 }