xref: /openbmc/linux/net/mac80211/debugfs_key.c (revision c819e2cf)
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 <linux/slab.h>
13 #include "ieee80211_i.h"
14 #include "key.h"
15 #include "debugfs.h"
16 #include "debugfs_key.h"
17 
18 #define KEY_READ(name, prop, format_string)				\
19 static ssize_t key_##name##_read(struct file *file,			\
20 				 char __user *userbuf,			\
21 				 size_t count, loff_t *ppos)		\
22 {									\
23 	struct ieee80211_key *key = file->private_data;			\
24 	return mac80211_format_buffer(userbuf, count, ppos, 		\
25 				      format_string, key->prop);	\
26 }
27 #define KEY_READ_D(name) KEY_READ(name, name, "%d\n")
28 #define KEY_READ_X(name) KEY_READ(name, name, "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 = simple_open,						\
34 	.llseek = generic_file_llseek,					\
35 }
36 
37 #define KEY_FILE(name, format)						\
38 		 KEY_READ_##format(name)				\
39 		 KEY_OPS(name)
40 
41 #define KEY_CONF_READ(name, format_string)				\
42 	KEY_READ(conf_##name, conf.name, format_string)
43 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, "%d\n")
44 
45 #define KEY_CONF_OPS(name)						\
46 static const struct file_operations key_ ##name## _ops = {		\
47 	.read = key_conf_##name##_read,					\
48 	.open = simple_open,						\
49 	.llseek = generic_file_llseek,					\
50 }
51 
52 #define KEY_CONF_FILE(name, format)					\
53 		 KEY_CONF_READ_##format(name)				\
54 		 KEY_CONF_OPS(name)
55 
56 KEY_CONF_FILE(keylen, D);
57 KEY_CONF_FILE(keyidx, D);
58 KEY_CONF_FILE(hw_key_idx, D);
59 KEY_FILE(flags, X);
60 KEY_FILE(tx_rx_count, D);
61 KEY_READ(ifindex, sdata->name, "%s\n");
62 KEY_OPS(ifindex);
63 
64 static ssize_t key_algorithm_read(struct file *file,
65 				  char __user *userbuf,
66 				  size_t count, loff_t *ppos)
67 {
68 	char buf[15];
69 	struct ieee80211_key *key = file->private_data;
70 	u32 c = key->conf.cipher;
71 
72 	sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
73 		c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
74 	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
75 }
76 KEY_OPS(algorithm);
77 
78 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
79 				size_t count, loff_t *ppos)
80 {
81 	u64 pn;
82 	char buf[20];
83 	int len;
84 	struct ieee80211_key *key = file->private_data;
85 
86 	switch (key->conf.cipher) {
87 	case WLAN_CIPHER_SUITE_WEP40:
88 	case WLAN_CIPHER_SUITE_WEP104:
89 		len = scnprintf(buf, sizeof(buf), "\n");
90 		break;
91 	case WLAN_CIPHER_SUITE_TKIP:
92 		len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
93 				key->u.tkip.tx.iv32,
94 				key->u.tkip.tx.iv16);
95 		break;
96 	case WLAN_CIPHER_SUITE_CCMP:
97 		pn = atomic64_read(&key->u.ccmp.tx_pn);
98 		len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
99 				(u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
100 				(u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
101 		break;
102 	case WLAN_CIPHER_SUITE_AES_CMAC:
103 		pn = atomic64_read(&key->u.aes_cmac.tx_pn);
104 		len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
105 				(u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
106 				(u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
107 		break;
108 	default:
109 		return 0;
110 	}
111 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
112 }
113 KEY_OPS(tx_spec);
114 
115 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
116 				size_t count, loff_t *ppos)
117 {
118 	struct ieee80211_key *key = file->private_data;
119 	char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
120 	int i, len;
121 	const u8 *rpn;
122 
123 	switch (key->conf.cipher) {
124 	case WLAN_CIPHER_SUITE_WEP40:
125 	case WLAN_CIPHER_SUITE_WEP104:
126 		len = scnprintf(buf, sizeof(buf), "\n");
127 		break;
128 	case WLAN_CIPHER_SUITE_TKIP:
129 		for (i = 0; i < IEEE80211_NUM_TIDS; i++)
130 			p += scnprintf(p, sizeof(buf)+buf-p,
131 				       "%08x %04x\n",
132 				       key->u.tkip.rx[i].iv32,
133 				       key->u.tkip.rx[i].iv16);
134 		len = p - buf;
135 		break;
136 	case WLAN_CIPHER_SUITE_CCMP:
137 		for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
138 			rpn = key->u.ccmp.rx_pn[i];
139 			p += scnprintf(p, sizeof(buf)+buf-p,
140 				       "%02x%02x%02x%02x%02x%02x\n",
141 				       rpn[0], rpn[1], rpn[2],
142 				       rpn[3], rpn[4], rpn[5]);
143 		}
144 		len = p - buf;
145 		break;
146 	case WLAN_CIPHER_SUITE_AES_CMAC:
147 		rpn = key->u.aes_cmac.rx_pn;
148 		p += scnprintf(p, sizeof(buf)+buf-p,
149 			       "%02x%02x%02x%02x%02x%02x\n",
150 			       rpn[0], rpn[1], rpn[2],
151 			       rpn[3], rpn[4], rpn[5]);
152 		len = p - buf;
153 		break;
154 	default:
155 		return 0;
156 	}
157 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
158 }
159 KEY_OPS(rx_spec);
160 
161 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
162 				size_t count, loff_t *ppos)
163 {
164 	struct ieee80211_key *key = file->private_data;
165 	char buf[20];
166 	int len;
167 
168 	switch (key->conf.cipher) {
169 	case WLAN_CIPHER_SUITE_CCMP:
170 		len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
171 		break;
172 	case WLAN_CIPHER_SUITE_AES_CMAC:
173 		len = scnprintf(buf, sizeof(buf), "%u\n",
174 				key->u.aes_cmac.replays);
175 		break;
176 	default:
177 		return 0;
178 	}
179 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
180 }
181 KEY_OPS(replays);
182 
183 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
184 				  size_t count, loff_t *ppos)
185 {
186 	struct ieee80211_key *key = file->private_data;
187 	char buf[20];
188 	int len;
189 
190 	switch (key->conf.cipher) {
191 	case WLAN_CIPHER_SUITE_AES_CMAC:
192 		len = scnprintf(buf, sizeof(buf), "%u\n",
193 				key->u.aes_cmac.icverrors);
194 		break;
195 	default:
196 		return 0;
197 	}
198 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
199 }
200 KEY_OPS(icverrors);
201 
202 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
203 				     size_t count, loff_t *ppos)
204 {
205 	struct ieee80211_key *key = file->private_data;
206 	char buf[20];
207 	int len;
208 
209 	if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
210 		return -EINVAL;
211 
212 	len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
213 
214 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
215 }
216 KEY_OPS(mic_failures);
217 
218 static ssize_t key_key_read(struct file *file, char __user *userbuf,
219 			    size_t count, loff_t *ppos)
220 {
221 	struct ieee80211_key *key = file->private_data;
222 	int i, bufsize = 2 * key->conf.keylen + 2;
223 	char *buf = kmalloc(bufsize, GFP_KERNEL);
224 	char *p = buf;
225 	ssize_t res;
226 
227 	if (!buf)
228 		return -ENOMEM;
229 
230 	for (i = 0; i < key->conf.keylen; i++)
231 		p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
232 	p += scnprintf(p, bufsize+buf-p, "\n");
233 	res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
234 	kfree(buf);
235 	return res;
236 }
237 KEY_OPS(key);
238 
239 #define DEBUGFS_ADD(name) \
240 	debugfs_create_file(#name, 0400, key->debugfs.dir, \
241 			    key, &key_##name##_ops);
242 
243 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
244 {
245 	static int keycount;
246 	char buf[100];
247 	struct sta_info *sta;
248 
249 	if (!key->local->debugfs.keys)
250 		return;
251 
252 	sprintf(buf, "%d", keycount);
253 	key->debugfs.cnt = keycount;
254 	keycount++;
255 	key->debugfs.dir = debugfs_create_dir(buf,
256 					key->local->debugfs.keys);
257 
258 	if (!key->debugfs.dir)
259 		return;
260 
261 	sta = key->sta;
262 	if (sta) {
263 		sprintf(buf, "../../netdev:%s/stations/%pM",
264 			sta->sdata->name, sta->sta.addr);
265 		key->debugfs.stalink =
266 			debugfs_create_symlink("station", key->debugfs.dir, buf);
267 	}
268 
269 	DEBUGFS_ADD(keylen);
270 	DEBUGFS_ADD(flags);
271 	DEBUGFS_ADD(keyidx);
272 	DEBUGFS_ADD(hw_key_idx);
273 	DEBUGFS_ADD(tx_rx_count);
274 	DEBUGFS_ADD(algorithm);
275 	DEBUGFS_ADD(tx_spec);
276 	DEBUGFS_ADD(rx_spec);
277 	DEBUGFS_ADD(replays);
278 	DEBUGFS_ADD(icverrors);
279 	DEBUGFS_ADD(mic_failures);
280 	DEBUGFS_ADD(key);
281 	DEBUGFS_ADD(ifindex);
282 };
283 
284 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
285 {
286 	if (!key)
287 		return;
288 
289 	debugfs_remove_recursive(key->debugfs.dir);
290 	key->debugfs.dir = NULL;
291 }
292 
293 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
294 {
295 	char buf[50];
296 	struct ieee80211_key *key;
297 
298 	if (!sdata->vif.debugfs_dir)
299 		return;
300 
301 	lockdep_assert_held(&sdata->local->key_mtx);
302 
303 	debugfs_remove(sdata->debugfs.default_unicast_key);
304 	sdata->debugfs.default_unicast_key = NULL;
305 
306 	if (sdata->default_unicast_key) {
307 		key = key_mtx_dereference(sdata->local,
308 					  sdata->default_unicast_key);
309 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
310 		sdata->debugfs.default_unicast_key =
311 			debugfs_create_symlink("default_unicast_key",
312 					       sdata->vif.debugfs_dir, buf);
313 	}
314 
315 	debugfs_remove(sdata->debugfs.default_multicast_key);
316 	sdata->debugfs.default_multicast_key = NULL;
317 
318 	if (sdata->default_multicast_key) {
319 		key = key_mtx_dereference(sdata->local,
320 					  sdata->default_multicast_key);
321 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
322 		sdata->debugfs.default_multicast_key =
323 			debugfs_create_symlink("default_multicast_key",
324 					       sdata->vif.debugfs_dir, buf);
325 	}
326 }
327 
328 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
329 {
330 	char buf[50];
331 	struct ieee80211_key *key;
332 
333 	if (!sdata->vif.debugfs_dir)
334 		return;
335 
336 	key = key_mtx_dereference(sdata->local,
337 				  sdata->default_mgmt_key);
338 	if (key) {
339 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
340 		sdata->debugfs.default_mgmt_key =
341 			debugfs_create_symlink("default_mgmt_key",
342 					       sdata->vif.debugfs_dir, buf);
343 	} else
344 		ieee80211_debugfs_key_remove_mgmt_default(sdata);
345 }
346 
347 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
348 {
349 	if (!sdata)
350 		return;
351 
352 	debugfs_remove(sdata->debugfs.default_mgmt_key);
353 	sdata->debugfs.default_mgmt_key = NULL;
354 }
355 
356 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
357 				   struct sta_info *sta)
358 {
359 	debugfs_remove(key->debugfs.stalink);
360 	key->debugfs.stalink = NULL;
361 }
362