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
55static void p80211req_handlemsg(struct wlandevice *wlandev,
56				struct p80211msg *msg);
57static void p80211req_mibset_mibget(struct wlandevice *wlandev,
58				    struct p80211msg_dot11req_mibget *mib_msg,
59				    int isget);
60
61static 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 */
93int 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 */
150static 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
177static 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