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
75static void p80211req_handlemsg(wlandevice_t *wlandev, struct p80211msg *msg);
76static int 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----------------------------------------------------------------*/
96int p80211req_dorequest(wlandevice_t *wlandev, u8 *msgbuf)
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)) {
112		printk(KERN_ERR
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----------------------------------------------------------------*/
153static 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 &=
161			    ~(HOSTWEP_DECRYPT | HOSTWEP_ENCRYPT);
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		}
169	case DIDmsg_dot11req_mibget:
170	case DIDmsg_dot11req_mibset:{
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		}
176	default:
177		;
178	}			/* switch msg->msgcode */
179
180	return;
181}
182
183static int p80211req_mibset_mibget(wlandevice_t *wlandev,
184				   struct p80211msg_dot11req_mibget *mib_msg,
185				   int isget)
186{
187	p80211itemd_t *mibitem = (p80211itemd_t *) mib_msg->mibattribute.data;
188	p80211pstrd_t *pstr = (p80211pstrd_t *) mibitem->data;
189	u8 *key = mibitem->data + sizeof(p80211pstrd_t);
190
191	switch (mibitem->did) {
192	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey0:{
193			if (!isget)
194				wep_change_key(wlandev, 0, key, pstr->len);
195			break;
196		}
197	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey1:{
198			if (!isget)
199				wep_change_key(wlandev, 1, key, pstr->len);
200			break;
201		}
202	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey2:{
203			if (!isget)
204				wep_change_key(wlandev, 2, key, pstr->len);
205			break;
206		}
207	case DIDmib_dot11smt_dot11WEPDefaultKeysTable_dot11WEPDefaultKey3:{
208			if (!isget)
209				wep_change_key(wlandev, 3, key, pstr->len);
210			break;
211		}
212	case DIDmib_dot11smt_dot11PrivacyTable_dot11WEPDefaultKeyID:{
213			u32 *data = (u32 *) mibitem->data;
214
215			if (isget) {
216				*data =
217				    wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK;
218			} else {
219				wlandev->hostwep &= ~(HOSTWEP_DEFAULTKEY_MASK);
220
221				wlandev->hostwep |=
222				    (*data & HOSTWEP_DEFAULTKEY_MASK);
223			}
224			break;
225		}
226	case DIDmib_dot11smt_dot11PrivacyTable_dot11PrivacyInvoked:{
227			u32 *data = (u32 *) mibitem->data;
228
229			if (isget) {
230				if (wlandev->hostwep & HOSTWEP_PRIVACYINVOKED)
231					*data = P80211ENUM_truth_true;
232				else
233					*data = P80211ENUM_truth_false;
234			} else {
235				wlandev->hostwep &= ~(HOSTWEP_PRIVACYINVOKED);
236				if (*data == P80211ENUM_truth_true)
237					wlandev->hostwep |=
238					    HOSTWEP_PRIVACYINVOKED;
239			}
240			break;
241		}
242	case DIDmib_dot11smt_dot11PrivacyTable_dot11ExcludeUnencrypted:{
243			u32 *data = (u32 *) mibitem->data;
244
245			if (isget) {
246				if (wlandev->hostwep &
247				    HOSTWEP_EXCLUDEUNENCRYPTED)
248					*data = P80211ENUM_truth_true;
249				else
250					*data = P80211ENUM_truth_false;
251			} else {
252				wlandev->hostwep &=
253				    ~(HOSTWEP_EXCLUDEUNENCRYPTED);
254				if (*data == P80211ENUM_truth_true)
255					wlandev->hostwep |=
256					    HOSTWEP_EXCLUDEUNENCRYPTED;
257			}
258			break;
259		}
260	default:
261		;
262	}
263
264	return 0;
265}
266