Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
p80211req.c
Go to the documentation of this file.
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.
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(wlandevice_t *wlandev, struct p80211msg *msg);
76 static void p80211req_mibset_mibget(wlandevice_t *wlandev,
77  struct p80211msg_dot11req_mibget *mib_msg,
78  int isget);
79 
80 /*----------------------------------------------------------------
81 * p80211req_dorequest
82 *
83 * Handles an MLME reqest/confirm message.
84 *
85 * Arguments:
86 * wlandev WLAN device struct
87 * msgbuf Buffer containing a request message
88 *
89 * Returns:
90 * 0 on success, an errno otherwise
91 *
92 * Call context:
93 * Potentially blocks the caller, so it's a good idea to
94 * not call this function from an interrupt context.
95 ----------------------------------------------------------------*/
97 {
98  int result = 0;
99  struct p80211msg *msg = (struct p80211msg *) msgbuf;
100 
101  /* Check to make sure the MSD is running */
102  if (!((wlandev->msdstate == WLAN_MSD_HWPRESENT &&
103  msg->msgcode == DIDmsg_lnxreq_ifstate) ||
104  wlandev->msdstate == WLAN_MSD_RUNNING ||
105  wlandev->msdstate == WLAN_MSD_FWLOAD)) {
106  return -ENODEV;
107  }
108 
109  /* Check Permissions */
110  if (!capable(CAP_NET_ADMIN) &&
111  (msg->msgcode != DIDmsg_dot11req_mibget)) {
113  "%s: only dot11req_mibget allowed for non-root.\n",
114  wlandev->name);
115  return -EPERM;
116  }
117 
118  /* Check for busy status */
119  if (test_and_set_bit(1, &(wlandev->request_pending)))
120  return -EBUSY;
121 
122  /* Allow p80211 to look at msg and handle if desired. */
123  /* So far, all p80211 msgs are immediate, no waitq/timer necessary */
124  /* This may change. */
125  p80211req_handlemsg(wlandev, msg);
126 
127  /* Pass it down to wlandev via wlandev->mlmerequest */
128  if (wlandev->mlmerequest != NULL)
129  wlandev->mlmerequest(wlandev, msg);
130 
131  clear_bit(1, &(wlandev->request_pending));
132  return result; /* if result==0, msg->status still may contain an err */
133 }
134 
135 /*----------------------------------------------------------------
136 * p80211req_handlemsg
137 *
138 * p80211 message handler. Primarily looks for messages that
139 * belong to p80211 and then dispatches the appropriate response.
140 * TODO: we don't do anything yet. Once the linuxMIB is better
141 * defined we'll need a get/set handler.
142 *
143 * Arguments:
144 * wlandev WLAN device struct
145 * msg message structure
146 *
147 * Returns:
148 * nothing (any results are set in the status field of the msg)
149 *
150 * Call context:
151 * Process thread
152 ----------------------------------------------------------------*/
153 static void p80211req_handlemsg(wlandevice_t *wlandev, struct p80211msg *msg)
154 {
155  switch (msg->msgcode) {
156 
157  case DIDmsg_lnxreq_hostwep:{
158  struct p80211msg_lnxreq_hostwep *req =
159  (struct p80211msg_lnxreq_hostwep *) msg;
160  wlandev->hostwep &=
162  if (req->decrypt.data == P80211ENUM_truth_true)
163  wlandev->hostwep |= HOSTWEP_DECRYPT;
164  if (req->encrypt.data == P80211ENUM_truth_true)
165  wlandev->hostwep |= HOSTWEP_ENCRYPT;
166 
167  break;
168  }
171  int isget = (msg->msgcode == DIDmsg_dot11req_mibget);
172  struct p80211msg_dot11req_mibget *mib_msg =
173  (struct p80211msg_dot11req_mibget *) msg;
174  p80211req_mibset_mibget(wlandev, mib_msg, isget);
175  break;
176  }
177  } /* switch msg->msgcode */
178 }
179 
180 static void p80211req_mibset_mibget(wlandevice_t *wlandev,
181  struct p80211msg_dot11req_mibget *mib_msg,
182  int isget)
183 {
184  p80211itemd_t *mibitem = (p80211itemd_t *) mib_msg->mibattribute.data;
185  p80211pstrd_t *pstr = (p80211pstrd_t *) mibitem->data;
186  u8 *key = mibitem->data + sizeof(p80211pstrd_t);
187 
188  switch (mibitem->did) {
190  if (!isget)
191  wep_change_key(wlandev, 0, key, pstr->len);
192  break;
193  }
195  if (!isget)
196  wep_change_key(wlandev, 1, key, pstr->len);
197  break;
198  }
200  if (!isget)
201  wep_change_key(wlandev, 2, key, pstr->len);
202  break;
203  }
205  if (!isget)
206  wep_change_key(wlandev, 3, key, pstr->len);
207  break;
208  }
210  u32 *data = (u32 *) mibitem->data;
211 
212  if (isget) {
213  *data = wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK;
214  } else {
215  wlandev->hostwep &= ~(HOSTWEP_DEFAULTKEY_MASK);
216  wlandev->hostwep |= (*data & HOSTWEP_DEFAULTKEY_MASK);
217  }
218  break;
219  }
221  u32 *data = (u32 *) mibitem->data;
222 
223  if (isget) {
224  if (wlandev->hostwep & HOSTWEP_PRIVACYINVOKED)
225  *data = P80211ENUM_truth_true;
226  else
227  *data = P80211ENUM_truth_false;
228  } else {
229  wlandev->hostwep &= ~(HOSTWEP_PRIVACYINVOKED);
230  if (*data == P80211ENUM_truth_true)
231  wlandev->hostwep |= HOSTWEP_PRIVACYINVOKED;
232  }
233  break;
234  }
236  u32 *data = (u32 *) mibitem->data;
237 
238  if (isget) {
239  if (wlandev->hostwep & HOSTWEP_EXCLUDEUNENCRYPTED)
240  *data = P80211ENUM_truth_true;
241  else
242  *data = P80211ENUM_truth_false;
243  } else {
244  wlandev->hostwep &= ~(HOSTWEP_EXCLUDEUNENCRYPTED);
245  if (*data == P80211ENUM_truth_true)
247  }
248  break;
249  }
250  }
251 }