1 // SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
2 /*
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 * --------------------------------------------------------------------
12 *
13 * Inquiries regarding the linux-wlan Open Source project can be
14 * made directly to:
15 *
16 * AbsoluteValue Systems Inc.
17 * info@linux-wlan.com
18 * http://www.linux-wlan.com
19 *
20 * --------------------------------------------------------------------
21 *
22 * Portions of the development of this software were funded by
23 * Intersil Corporation as part of PRISM(R) chipset product development.
24 *
25 * --------------------------------------------------------------------
26 *
27 * This file contains the functions, types, and macros to support the
28 * MLME request interface that's implemented via the device ioctls.
29 *
30 * --------------------------------------------------------------------
31 */
32
33 #include <linux/module.h>
34 #include <linux/kernel.h>
35 #include <linux/sched.h>
36 #include <linux/types.h>
37 #include <linux/skbuff.h>
38 #include <linux/wireless.h>
39 #include <linux/netdevice.h>
40 #include <linux/etherdevice.h>
41 #include <net/sock.h>
42 #include <linux/netlink.h>
43
44 #include "p80211types.h"
45 #include "p80211hdr.h"
46 #include "p80211mgmt.h"
47 #include "p80211conv.h"
48 #include "p80211msg.h"
49 #include "p80211netdev.h"
50 #include "p80211ioctl.h"
51 #include "p80211metadef.h"
52 #include "p80211metastruct.h"
53 #include "p80211req.h"
54
55 static void p80211req_handlemsg(struct wlandevice *wlandev,
56 struct p80211msg *msg);
57 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
58 struct p80211msg_dot11req_mibget *mib_msg,
59 int isget);
60
p80211req_handle_action(struct wlandevice * wlandev,u32 * data,int isget,u32 flag)61 static void p80211req_handle_action(struct wlandevice *wlandev, u32 *data,
62 int isget, u32 flag)
63 {
64 if (isget) {
65 if (wlandev->hostwep & flag)
66 *data = P80211ENUM_truth_true;
67 else
68 *data = P80211ENUM_truth_false;
69 } else {
70 wlandev->hostwep &= ~flag;
71 if (*data == P80211ENUM_truth_true)
72 wlandev->hostwep |= flag;
73 }
74 }
75
76 /*----------------------------------------------------------------
77 * p80211req_dorequest
78 *
79 * Handles an MLME request/confirm message.
80 *
81 * Arguments:
82 * wlandev WLAN device struct
83 * msgbuf Buffer containing a request message
84 *
85 * Returns:
86 * 0 on success, an errno otherwise
87 *
88 * Call context:
89 * Potentially blocks the caller, so it's a good idea to
90 * not call this function from an interrupt context.
91 *----------------------------------------------------------------
92 */
p80211req_dorequest(struct wlandevice * wlandev,u8 * msgbuf)93 int p80211req_dorequest(struct wlandevice *wlandev, u8 *msgbuf)
94 {
95 struct p80211msg *msg = (struct p80211msg *)msgbuf;
96
97 /* Check to make sure the MSD is running */
98 if (!((wlandev->msdstate == WLAN_MSD_HWPRESENT &&
99 msg->msgcode == DIDMSG_LNXREQ_IFSTATE) ||
100 wlandev->msdstate == WLAN_MSD_RUNNING ||
101 wlandev->msdstate == WLAN_MSD_FWLOAD)) {
102 return -ENODEV;
103 }
104
105 /* Check Permissions */
106 if (!capable(CAP_NET_ADMIN) &&
107 (msg->msgcode != DIDMSG_DOT11REQ_MIBGET)) {
108 netdev_err(wlandev->netdev,
109 "%s: only dot11req_mibget allowed for non-root.\n",
110 wlandev->name);
111 return -EPERM;
112 }
113
114 /* Check for busy status */
115 if (test_and_set_bit(1, &wlandev->request_pending))
116 return -EBUSY;
117
118 /* Allow p80211 to look at msg and handle if desired. */
119 /* So far, all p80211 msgs are immediate, no waitq/timer necessary */
120 /* This may change. */
121 p80211req_handlemsg(wlandev, msg);
122
123 /* Pass it down to wlandev via wlandev->mlmerequest */
124 if (wlandev->mlmerequest)
125 wlandev->mlmerequest(wlandev, msg);
126
127 clear_bit(1, &wlandev->request_pending);
128 return 0; /* if result==0, msg->status still may contain an err */
129 }
130
131 /*----------------------------------------------------------------
132 * p80211req_handlemsg
133 *
134 * p80211 message handler. Primarily looks for messages that
135 * belong to p80211 and then dispatches the appropriate response.
136 * TODO: we don't do anything yet. Once the linuxMIB is better
137 * defined we'll need a get/set handler.
138 *
139 * Arguments:
140 * wlandev WLAN device struct
141 * msg message structure
142 *
143 * Returns:
144 * nothing (any results are set in the status field of the msg)
145 *
146 * Call context:
147 * Process thread
148 *----------------------------------------------------------------
149 */
p80211req_handlemsg(struct wlandevice * wlandev,struct p80211msg * msg)150 static void p80211req_handlemsg(struct wlandevice *wlandev,
151 struct p80211msg *msg)
152 {
153 switch (msg->msgcode) {
154 case DIDMSG_LNXREQ_HOSTWEP: {
155 struct p80211msg_lnxreq_hostwep *req =
156 (struct p80211msg_lnxreq_hostwep *)msg;
157 wlandev->hostwep &=
158 ~(HOSTWEP_DECRYPT | HOSTWEP_ENCRYPT);
159 if (req->decrypt.data == P80211ENUM_truth_true)
160 wlandev->hostwep |= HOSTWEP_DECRYPT;
161 if (req->encrypt.data == P80211ENUM_truth_true)
162 wlandev->hostwep |= HOSTWEP_ENCRYPT;
163
164 break;
165 }
166 case DIDMSG_DOT11REQ_MIBGET:
167 case DIDMSG_DOT11REQ_MIBSET: {
168 int isget = (msg->msgcode == DIDMSG_DOT11REQ_MIBGET);
169 struct p80211msg_dot11req_mibget *mib_msg =
170 (struct p80211msg_dot11req_mibget *)msg;
171 p80211req_mibset_mibget(wlandev, mib_msg, isget);
172 break;
173 }
174 } /* switch msg->msgcode */
175 }
176
p80211req_mibset_mibget(struct wlandevice * wlandev,struct p80211msg_dot11req_mibget * mib_msg,int isget)177 static void p80211req_mibset_mibget(struct wlandevice *wlandev,
178 struct p80211msg_dot11req_mibget *mib_msg,
179 int isget)
180 {
181 struct p80211itemd *mibitem =
182 (struct p80211itemd *)mib_msg->mibattribute.data;
183 struct p80211pstrd *pstr = (struct p80211pstrd *)mibitem->data;
184 u8 *key = mibitem->data + sizeof(struct p80211pstrd);
185
186 switch (mibitem->did) {
187 case didmib_dot11smt_wepdefaultkeystable_key(1):
188 case didmib_dot11smt_wepdefaultkeystable_key(2):
189 case didmib_dot11smt_wepdefaultkeystable_key(3):
190 case didmib_dot11smt_wepdefaultkeystable_key(4):
191 if (!isget)
192 wep_change_key(wlandev,
193 P80211DID_ITEM(mibitem->did) - 1,
194 key, pstr->len);
195 break;
196
197 case DIDMIB_DOT11SMT_PRIVACYTABLE_WEPDEFAULTKEYID: {
198 u32 *data = (u32 *)mibitem->data;
199
200 if (isget) {
201 *data = wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK;
202 } else {
203 wlandev->hostwep &= ~(HOSTWEP_DEFAULTKEY_MASK);
204 wlandev->hostwep |= (*data & HOSTWEP_DEFAULTKEY_MASK);
205 }
206 break;
207 }
208 case DIDMIB_DOT11SMT_PRIVACYTABLE_PRIVACYINVOKED: {
209 u32 *data = (u32 *)mibitem->data;
210
211 p80211req_handle_action(wlandev, data, isget,
212 HOSTWEP_PRIVACYINVOKED);
213 break;
214 }
215 case DIDMIB_DOT11SMT_PRIVACYTABLE_EXCLUDEUNENCRYPTED: {
216 u32 *data = (u32 *)mibitem->data;
217
218 p80211req_handle_action(wlandev, data, isget,
219 HOSTWEP_EXCLUDEUNENCRYPTED);
220 break;
221 }
222 }
223 }
224