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 }