xref: /openbmc/linux/net/mac80211/debugfs_key.c (revision b6dcefde) 
1 /*
2  * Copyright 2003-2005	Devicescape Software, Inc.
3  * Copyright (c) 2006	Jiri Benc <jbenc@suse.cz>
4  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/kobject.h>
12 #include "ieee80211_i.h"
13 #include "key.h"
14 #include "debugfs.h"
15 #include "debugfs_key.h"
16 
17 #define KEY_READ(name, prop, buflen, format_string)			\
18 static ssize_t key_##name##_read(struct file *file,			\
19 				 char __user *userbuf,			\
20 				 size_t count, loff_t *ppos)		\
21 {									\
22 	char buf[buflen];						\
23 	struct ieee80211_key *key = file->private_data;			\
24 	int res = scnprintf(buf, buflen, format_string, key->prop);	\
25 	return simple_read_from_buffer(userbuf, count, ppos, buf, res);	\
26 }
27 #define KEY_READ_D(name) KEY_READ(name, name, 20, "%d\n")
28 #define KEY_READ_X(name) KEY_READ(name, name, 20, "0x%x\n")
29 
30 #define KEY_OPS(name)							\
31 static const struct file_operations key_ ##name## _ops = {		\
32 	.read = key_##name##_read,					\
33 	.open = mac80211_open_file_generic,				\
34 }
35 
36 #define KEY_FILE(name, format)						\
37 		 KEY_READ_##format(name)				\
38 		 KEY_OPS(name)
39 
40 #define KEY_CONF_READ(name, buflen, format_string)			\
41 	KEY_READ(conf_##name, conf.name, buflen, format_string)
42 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, 20, "%d\n")
43 
44 #define KEY_CONF_OPS(name)						\
45 static const struct file_operations key_ ##name## _ops = {		\
46 	.read = key_conf_##name##_read,					\
47 	.open = mac80211_open_file_generic,				\
48 }
49 
50 #define KEY_CONF_FILE(name, format)					\
51 		 KEY_CONF_READ_##format(name)				\
52 		 KEY_CONF_OPS(name)
53 
54 KEY_CONF_FILE(keylen, D);
55 KEY_CONF_FILE(keyidx, D);
56 KEY_CONF_FILE(hw_key_idx, D);
57 KEY_FILE(flags, X);
58 KEY_FILE(tx_rx_count, D);
59 KEY_READ(ifindex, sdata->dev->ifindex, 20, "%d\n");
60 KEY_OPS(ifindex);
61 
62 static ssize_t key_algorithm_read(struct file *file,
63 				  char __user *userbuf,
64 				  size_t count, loff_t *ppos)
65 {
66 	char *alg;
67 	struct ieee80211_key *key = file->private_data;
68 
69 	switch (key->conf.alg) {
70 	case ALG_WEP:
71 		alg = "WEP\n";
72 		break;
73 	case ALG_TKIP:
74 		alg = "TKIP\n";
75 		break;
76 	case ALG_CCMP:
77 		alg = "CCMP\n";
78 		break;
79 	case ALG_AES_CMAC:
80 		alg = "AES-128-CMAC\n";
81 		break;
82 	default:
83 		return 0;
84 	}
85 	return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
86 }
87 KEY_OPS(algorithm);
88 
89 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
90 				size_t count, loff_t *ppos)
91 {
92 	const u8 *tpn;
93 	char buf[20];
94 	int len;
95 	struct ieee80211_key *key = file->private_data;
96 
97 	switch (key->conf.alg) {
98 	case ALG_WEP:
99 		len = scnprintf(buf, sizeof(buf), "\n");
100 		break;
101 	case ALG_TKIP:
102 		len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
103 				key->u.tkip.tx.iv32,
104 				key->u.tkip.tx.iv16);
105 		break;
106 	case ALG_CCMP:
107 		tpn = key->u.ccmp.tx_pn;
108 		len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
109 				tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
110 		break;
111 	case ALG_AES_CMAC:
112 		tpn = key->u.aes_cmac.tx_pn;
113 		len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
114 				tpn[0], tpn[1], tpn[2], tpn[3], tpn[4],
115 				tpn[5]);
116 		break;
117 	default:
118 		return 0;
119 	}
120 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
121 }
122 KEY_OPS(tx_spec);
123 
124 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
125 				size_t count, loff_t *ppos)
126 {
127 	struct ieee80211_key *key = file->private_data;
128 	char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
129 	int i, len;
130 	const u8 *rpn;
131 
132 	switch (key->conf.alg) {
133 	case ALG_WEP:
134 		len = scnprintf(buf, sizeof(buf), "\n");
135 		break;
136 	case ALG_TKIP:
137 		for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
138 			p += scnprintf(p, sizeof(buf)+buf-p,
139 				       "%08x %04x\n",
140 				       key->u.tkip.rx[i].iv32,
141 				       key->u.tkip.rx[i].iv16);
142 		len = p - buf;
143 		break;
144 	case ALG_CCMP:
145 		for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
146 			rpn = key->u.ccmp.rx_pn[i];
147 			p += scnprintf(p, sizeof(buf)+buf-p,
148 				       "%02x%02x%02x%02x%02x%02x\n",
149 				       rpn[0], rpn[1], rpn[2],
150 				       rpn[3], rpn[4], rpn[5]);
151 		}
152 		len = p - buf;
153 		break;
154 	case ALG_AES_CMAC:
155 		rpn = key->u.aes_cmac.rx_pn;
156 		p += scnprintf(p, sizeof(buf)+buf-p,
157 			       "%02x%02x%02x%02x%02x%02x\n",
158 			       rpn[0], rpn[1], rpn[2],
159 			       rpn[3], rpn[4], rpn[5]);
160 		len = p - buf;
161 		break;
162 	default:
163 		return 0;
164 	}
165 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
166 }
167 KEY_OPS(rx_spec);
168 
169 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
170 				size_t count, loff_t *ppos)
171 {
172 	struct ieee80211_key *key = file->private_data;
173 	char buf[20];
174 	int len;
175 
176 	switch (key->conf.alg) {
177 	case ALG_CCMP:
178 		len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
179 		break;
180 	case ALG_AES_CMAC:
181 		len = scnprintf(buf, sizeof(buf), "%u\n",
182 				key->u.aes_cmac.replays);
183 		break;
184 	default:
185 		return 0;
186 	}
187 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
188 }
189 KEY_OPS(replays);
190 
191 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
192 				  size_t count, loff_t *ppos)
193 {
194 	struct ieee80211_key *key = file->private_data;
195 	char buf[20];
196 	int len;
197 
198 	switch (key->conf.alg) {
199 	case ALG_AES_CMAC:
200 		len = scnprintf(buf, sizeof(buf), "%u\n",
201 				key->u.aes_cmac.icverrors);
202 		break;
203 	default:
204 		return 0;
205 	}
206 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
207 }
208 KEY_OPS(icverrors);
209 
210 static ssize_t key_key_read(struct file *file, char __user *userbuf,
211 			    size_t count, loff_t *ppos)
212 {
213 	struct ieee80211_key *key = file->private_data;
214 	int i, res, bufsize = 2 * key->conf.keylen + 2;
215 	char *buf = kmalloc(bufsize, GFP_KERNEL);
216 	char *p = buf;
217 
218 	for (i = 0; i < key->conf.keylen; i++)
219 		p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
220 	p += scnprintf(p, bufsize+buf-p, "\n");
221 	res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
222 	kfree(buf);
223 	return res;
224 }
225 KEY_OPS(key);
226 
227 #define DEBUGFS_ADD(name) \
228 	debugfs_create_file(#name, 0400, key->debugfs.dir, \
229 			    key, &key_##name##_ops);
230 
231 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
232   {
233 	static int keycount;
234 	char buf[50];
235 	struct sta_info *sta;
236 
237 	if (!key->local->debugfs.keys)
238 		return;
239 
240 	sprintf(buf, "%d", keycount);
241 	key->debugfs.cnt = keycount;
242 	keycount++;
243 	key->debugfs.dir = debugfs_create_dir(buf,
244 					key->local->debugfs.keys);
245 
246 	if (!key->debugfs.dir)
247 		return;
248 
249 	rcu_read_lock();
250 	sta = rcu_dereference(key->sta);
251 	if (sta)
252 		sprintf(buf, "../../stations/%pM", sta->sta.addr);
253 	rcu_read_unlock();
254 
255 	/* using sta as a boolean is fine outside RCU lock */
256 	if (sta)
257 		key->debugfs.stalink =
258 			debugfs_create_symlink("station", key->debugfs.dir, buf);
259 
260 	DEBUGFS_ADD(keylen);
261 	DEBUGFS_ADD(flags);
262 	DEBUGFS_ADD(keyidx);
263 	DEBUGFS_ADD(hw_key_idx);
264 	DEBUGFS_ADD(tx_rx_count);
265 	DEBUGFS_ADD(algorithm);
266 	DEBUGFS_ADD(tx_spec);
267 	DEBUGFS_ADD(rx_spec);
268 	DEBUGFS_ADD(replays);
269 	DEBUGFS_ADD(icverrors);
270 	DEBUGFS_ADD(key);
271 	DEBUGFS_ADD(ifindex);
272 };
273 
274 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
275 {
276 	if (!key)
277 		return;
278 
279 	debugfs_remove_recursive(key->debugfs.dir);
280 	key->debugfs.dir = NULL;
281 }
282 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
283 {
284 	char buf[50];
285 	struct ieee80211_key *key;
286 
287 	if (!sdata->debugfs.dir)
288 		return;
289 
290 	/* this is running under the key lock */
291 
292 	key = sdata->default_key;
293 	if (key) {
294 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
295 		sdata->debugfs.default_key =
296 			debugfs_create_symlink("default_key",
297 					       sdata->debugfs.dir, buf);
298 	} else
299 		ieee80211_debugfs_key_remove_default(sdata);
300 }
301 
302 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
303 {
304 	if (!sdata)
305 		return;
306 
307 	debugfs_remove(sdata->debugfs.default_key);
308 	sdata->debugfs.default_key = NULL;
309 }
310 
311 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
312 {
313 	char buf[50];
314 	struct ieee80211_key *key;
315 
316 	if (!sdata->debugfs.dir)
317 		return;
318 
319 	/* this is running under the key lock */
320 
321 	key = sdata->default_mgmt_key;
322 	if (key) {
323 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
324 		sdata->debugfs.default_mgmt_key =
325 			debugfs_create_symlink("default_mgmt_key",
326 					       sdata->debugfs.dir, buf);
327 	} else
328 		ieee80211_debugfs_key_remove_mgmt_default(sdata);
329 }
330 
331 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
332 {
333 	if (!sdata)
334 		return;
335 
336 	debugfs_remove(sdata->debugfs.default_mgmt_key);
337 	sdata->debugfs.default_mgmt_key = NULL;
338 }
339 
340 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
341 				   struct sta_info *sta)
342 {
343 	debugfs_remove(key->debugfs.stalink);
344 	key->debugfs.stalink = NULL;
345 }
346