xref: /linux/net/mac80211/debugfs_key.c (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2003-2005	Devicescape Software, Inc.
4  * Copyright (c) 2006	Jiri Benc <jbenc@suse.cz>
5  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
6  * Copyright (C) 2015	Intel Deutschland GmbH
7  * Copyright (C) 2021-2023   Intel Corporation
8  */
9 
10 #include <linux/kobject.h>
11 #include <linux/slab.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, 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 	struct ieee80211_key *key = file->private_data;			\
23 	return mac80211_format_buffer(userbuf, count, ppos, 		\
24 				      format_string, key->prop);	\
25 }
26 #define KEY_READ_X(name) KEY_READ(name, name, "0x%x\n")
27 
28 #define KEY_OPS(name)							\
29 static const struct file_operations key_ ##name## _ops = {		\
30 	.read = key_##name##_read,					\
31 	.open = simple_open,						\
32 	.llseek = generic_file_llseek,					\
33 }
34 
35 #define KEY_OPS_W(name)							\
36 static const struct file_operations key_ ##name## _ops = {		\
37 	.read = key_##name##_read,					\
38 	.write = key_##name##_write,					\
39 	.open = simple_open,						\
40 	.llseek = generic_file_llseek,					\
41 }
42 
43 #define KEY_FILE(name, format)						\
44 		 KEY_READ_##format(name)				\
45 		 KEY_OPS(name)
46 
47 #define KEY_CONF_READ(name, format_string)				\
48 	KEY_READ(conf_##name, conf.name, format_string)
49 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, "%d\n")
50 
51 #define KEY_CONF_OPS(name)						\
52 static const struct file_operations key_ ##name## _ops = {		\
53 	.read = key_conf_##name##_read,					\
54 	.open = simple_open,						\
55 	.llseek = generic_file_llseek,					\
56 }
57 
58 #define KEY_CONF_FILE(name, format)					\
59 		 KEY_CONF_READ_##format(name)				\
60 		 KEY_CONF_OPS(name)
61 
62 KEY_CONF_FILE(keylen, D);
63 KEY_CONF_FILE(keyidx, D);
64 KEY_CONF_FILE(hw_key_idx, D);
65 KEY_FILE(flags, X);
66 KEY_READ(ifindex, sdata->name, "%s\n");
67 KEY_OPS(ifindex);
68 
key_algorithm_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)69 static ssize_t key_algorithm_read(struct file *file,
70 				  char __user *userbuf,
71 				  size_t count, loff_t *ppos)
72 {
73 	char buf[15];
74 	struct ieee80211_key *key = file->private_data;
75 	u32 c = key->conf.cipher;
76 
77 	sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
78 		c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
79 	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
80 }
81 KEY_OPS(algorithm);
82 
key_tx_spec_write(struct file * file,const char __user * userbuf,size_t count,loff_t * ppos)83 static ssize_t key_tx_spec_write(struct file *file, const char __user *userbuf,
84 				 size_t count, loff_t *ppos)
85 {
86 	struct ieee80211_key *key = file->private_data;
87 	u64 pn;
88 	int ret;
89 
90 	switch (key->conf.cipher) {
91 	case WLAN_CIPHER_SUITE_WEP40:
92 	case WLAN_CIPHER_SUITE_WEP104:
93 		return -EINVAL;
94 	case WLAN_CIPHER_SUITE_TKIP:
95 		/* not supported yet */
96 		return -EOPNOTSUPP;
97 	case WLAN_CIPHER_SUITE_CCMP:
98 	case WLAN_CIPHER_SUITE_CCMP_256:
99 	case WLAN_CIPHER_SUITE_AES_CMAC:
100 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
101 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
102 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
103 	case WLAN_CIPHER_SUITE_GCMP:
104 	case WLAN_CIPHER_SUITE_GCMP_256:
105 		ret = kstrtou64_from_user(userbuf, count, 16, &pn);
106 		if (ret)
107 			return ret;
108 		/* PN is a 48-bit counter */
109 		if (pn >= (1ULL << 48))
110 			return -ERANGE;
111 		atomic64_set(&key->conf.tx_pn, pn);
112 		return count;
113 	default:
114 		return 0;
115 	}
116 }
117 
key_tx_spec_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)118 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
119 				size_t count, loff_t *ppos)
120 {
121 	u64 pn;
122 	char buf[20];
123 	int len;
124 	struct ieee80211_key *key = file->private_data;
125 
126 	switch (key->conf.cipher) {
127 	case WLAN_CIPHER_SUITE_WEP40:
128 	case WLAN_CIPHER_SUITE_WEP104:
129 		len = scnprintf(buf, sizeof(buf), "\n");
130 		break;
131 	case WLAN_CIPHER_SUITE_TKIP:
132 		pn = atomic64_read(&key->conf.tx_pn);
133 		len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
134 				TKIP_PN_TO_IV32(pn),
135 				TKIP_PN_TO_IV16(pn));
136 		break;
137 	case WLAN_CIPHER_SUITE_CCMP:
138 	case WLAN_CIPHER_SUITE_CCMP_256:
139 	case WLAN_CIPHER_SUITE_AES_CMAC:
140 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
141 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
142 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
143 	case WLAN_CIPHER_SUITE_GCMP:
144 	case WLAN_CIPHER_SUITE_GCMP_256:
145 		pn = atomic64_read(&key->conf.tx_pn);
146 		len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
147 				(u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
148 				(u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
149 		break;
150 	default:
151 		return 0;
152 	}
153 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
154 }
155 KEY_OPS_W(tx_spec);
156 
key_rx_spec_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)157 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
158 				size_t count, loff_t *ppos)
159 {
160 	struct ieee80211_key *key = file->private_data;
161 	char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
162 	int i, len;
163 	const u8 *rpn;
164 
165 	switch (key->conf.cipher) {
166 	case WLAN_CIPHER_SUITE_WEP40:
167 	case WLAN_CIPHER_SUITE_WEP104:
168 		len = scnprintf(buf, sizeof(buf), "\n");
169 		break;
170 	case WLAN_CIPHER_SUITE_TKIP:
171 		for (i = 0; i < IEEE80211_NUM_TIDS; i++)
172 			p += scnprintf(p, sizeof(buf)+buf-p,
173 				       "%08x %04x\n",
174 				       key->u.tkip.rx[i].iv32,
175 				       key->u.tkip.rx[i].iv16);
176 		len = p - buf;
177 		break;
178 	case WLAN_CIPHER_SUITE_CCMP:
179 	case WLAN_CIPHER_SUITE_CCMP_256:
180 		for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
181 			rpn = key->u.ccmp.rx_pn[i];
182 			p += scnprintf(p, sizeof(buf)+buf-p,
183 				       "%02x%02x%02x%02x%02x%02x\n",
184 				       rpn[0], rpn[1], rpn[2],
185 				       rpn[3], rpn[4], rpn[5]);
186 		}
187 		len = p - buf;
188 		break;
189 	case WLAN_CIPHER_SUITE_AES_CMAC:
190 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
191 		rpn = key->u.aes_cmac.rx_pn;
192 		p += scnprintf(p, sizeof(buf)+buf-p,
193 			       "%02x%02x%02x%02x%02x%02x\n",
194 			       rpn[0], rpn[1], rpn[2],
195 			       rpn[3], rpn[4], rpn[5]);
196 		len = p - buf;
197 		break;
198 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
199 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
200 		rpn = key->u.aes_gmac.rx_pn;
201 		p += scnprintf(p, sizeof(buf)+buf-p,
202 			       "%02x%02x%02x%02x%02x%02x\n",
203 			       rpn[0], rpn[1], rpn[2],
204 			       rpn[3], rpn[4], rpn[5]);
205 		len = p - buf;
206 		break;
207 	case WLAN_CIPHER_SUITE_GCMP:
208 	case WLAN_CIPHER_SUITE_GCMP_256:
209 		for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
210 			rpn = key->u.gcmp.rx_pn[i];
211 			p += scnprintf(p, sizeof(buf)+buf-p,
212 				       "%02x%02x%02x%02x%02x%02x\n",
213 				       rpn[0], rpn[1], rpn[2],
214 				       rpn[3], rpn[4], rpn[5]);
215 		}
216 		len = p - buf;
217 		break;
218 	default:
219 		return 0;
220 	}
221 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
222 }
223 KEY_OPS(rx_spec);
224 
key_replays_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)225 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
226 				size_t count, loff_t *ppos)
227 {
228 	struct ieee80211_key *key = file->private_data;
229 	char buf[20];
230 	int len;
231 
232 	switch (key->conf.cipher) {
233 	case WLAN_CIPHER_SUITE_CCMP:
234 	case WLAN_CIPHER_SUITE_CCMP_256:
235 		len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
236 		break;
237 	case WLAN_CIPHER_SUITE_AES_CMAC:
238 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
239 		len = scnprintf(buf, sizeof(buf), "%u\n",
240 				key->u.aes_cmac.replays);
241 		break;
242 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
243 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
244 		len = scnprintf(buf, sizeof(buf), "%u\n",
245 				key->u.aes_gmac.replays);
246 		break;
247 	case WLAN_CIPHER_SUITE_GCMP:
248 	case WLAN_CIPHER_SUITE_GCMP_256:
249 		len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
250 		break;
251 	default:
252 		return 0;
253 	}
254 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
255 }
256 KEY_OPS(replays);
257 
key_icverrors_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)258 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
259 				  size_t count, loff_t *ppos)
260 {
261 	struct ieee80211_key *key = file->private_data;
262 	char buf[20];
263 	int len;
264 
265 	switch (key->conf.cipher) {
266 	case WLAN_CIPHER_SUITE_AES_CMAC:
267 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
268 		len = scnprintf(buf, sizeof(buf), "%u\n",
269 				key->u.aes_cmac.icverrors);
270 		break;
271 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
272 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
273 		len = scnprintf(buf, sizeof(buf), "%u\n",
274 				key->u.aes_gmac.icverrors);
275 		break;
276 	default:
277 		return 0;
278 	}
279 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
280 }
281 KEY_OPS(icverrors);
282 
key_mic_failures_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)283 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
284 				     size_t count, loff_t *ppos)
285 {
286 	struct ieee80211_key *key = file->private_data;
287 	char buf[20];
288 	int len;
289 
290 	if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
291 		return -EINVAL;
292 
293 	len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
294 
295 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
296 }
297 KEY_OPS(mic_failures);
298 
key_key_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)299 static ssize_t key_key_read(struct file *file, char __user *userbuf,
300 			    size_t count, loff_t *ppos)
301 {
302 	struct ieee80211_key *key = file->private_data;
303 	int i, bufsize = 2 * key->conf.keylen + 2;
304 	char *buf = kmalloc(bufsize, GFP_KERNEL);
305 	char *p = buf;
306 	ssize_t res;
307 
308 	if (!buf)
309 		return -ENOMEM;
310 
311 	for (i = 0; i < key->conf.keylen; i++)
312 		p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
313 	p += scnprintf(p, bufsize+buf-p, "\n");
314 	res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
315 	kfree(buf);
316 	return res;
317 }
318 KEY_OPS(key);
319 
320 #define DEBUGFS_ADD(name) \
321 	debugfs_create_file(#name, 0400, key->debugfs.dir, \
322 			    key, &key_##name##_ops)
323 #define DEBUGFS_ADD_W(name) \
324 	debugfs_create_file(#name, 0600, key->debugfs.dir, \
325 			    key, &key_##name##_ops);
326 
ieee80211_debugfs_key_add(struct ieee80211_key * key)327 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
328 {
329 	static int keycount;
330 	char buf[100];
331 	struct sta_info *sta;
332 
333 	if (!key->local->debugfs.keys)
334 		return;
335 
336 	sprintf(buf, "%d", keycount);
337 	key->debugfs.cnt = keycount;
338 	keycount++;
339 	key->debugfs.dir = debugfs_create_dir(buf,
340 					key->local->debugfs.keys);
341 
342 	sta = key->sta;
343 	if (sta) {
344 		sprintf(buf, "../../netdev:%s/stations/%pM",
345 			sta->sdata->name, sta->sta.addr);
346 		key->debugfs.stalink =
347 			debugfs_create_symlink("station", key->debugfs.dir, buf);
348 	}
349 
350 	DEBUGFS_ADD(keylen);
351 	DEBUGFS_ADD(flags);
352 	DEBUGFS_ADD(keyidx);
353 	DEBUGFS_ADD(hw_key_idx);
354 	DEBUGFS_ADD(algorithm);
355 	DEBUGFS_ADD_W(tx_spec);
356 	DEBUGFS_ADD(rx_spec);
357 	DEBUGFS_ADD(replays);
358 	DEBUGFS_ADD(icverrors);
359 	DEBUGFS_ADD(mic_failures);
360 	DEBUGFS_ADD(key);
361 	DEBUGFS_ADD(ifindex);
362 };
363 
ieee80211_debugfs_key_remove(struct ieee80211_key * key)364 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
365 {
366 	if (!key)
367 		return;
368 
369 	debugfs_remove_recursive(key->debugfs.dir);
370 	key->debugfs.dir = NULL;
371 }
372 
ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data * sdata)373 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
374 {
375 	char buf[50];
376 	struct ieee80211_key *key;
377 
378 	if (!sdata->vif.debugfs_dir)
379 		return;
380 
381 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
382 
383 	debugfs_remove(sdata->debugfs.default_unicast_key);
384 	sdata->debugfs.default_unicast_key = NULL;
385 
386 	if (sdata->default_unicast_key) {
387 		key = wiphy_dereference(sdata->local->hw.wiphy,
388 					sdata->default_unicast_key);
389 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
390 		sdata->debugfs.default_unicast_key =
391 			debugfs_create_symlink("default_unicast_key",
392 					       sdata->vif.debugfs_dir, buf);
393 	}
394 
395 	debugfs_remove(sdata->debugfs.default_multicast_key);
396 	sdata->debugfs.default_multicast_key = NULL;
397 
398 	if (sdata->deflink.default_multicast_key) {
399 		key = wiphy_dereference(sdata->local->hw.wiphy,
400 					sdata->deflink.default_multicast_key);
401 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
402 		sdata->debugfs.default_multicast_key =
403 			debugfs_create_symlink("default_multicast_key",
404 					       sdata->vif.debugfs_dir, buf);
405 	}
406 }
407 
ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data * sdata)408 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
409 {
410 	char buf[50];
411 	struct ieee80211_key *key;
412 
413 	if (!sdata->vif.debugfs_dir)
414 		return;
415 
416 	key = wiphy_dereference(sdata->local->hw.wiphy,
417 				sdata->deflink.default_mgmt_key);
418 	if (key) {
419 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
420 		sdata->debugfs.default_mgmt_key =
421 			debugfs_create_symlink("default_mgmt_key",
422 					       sdata->vif.debugfs_dir, buf);
423 	} else
424 		ieee80211_debugfs_key_remove_mgmt_default(sdata);
425 }
426 
ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data * sdata)427 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
428 {
429 	if (!sdata)
430 		return;
431 
432 	debugfs_remove(sdata->debugfs.default_mgmt_key);
433 	sdata->debugfs.default_mgmt_key = NULL;
434 }
435 
436 void
ieee80211_debugfs_key_add_beacon_default(struct ieee80211_sub_if_data * sdata)437 ieee80211_debugfs_key_add_beacon_default(struct ieee80211_sub_if_data *sdata)
438 {
439 	char buf[50];
440 	struct ieee80211_key *key;
441 
442 	if (!sdata->vif.debugfs_dir)
443 		return;
444 
445 	key = wiphy_dereference(sdata->local->hw.wiphy,
446 				sdata->deflink.default_beacon_key);
447 	if (key) {
448 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
449 		sdata->debugfs.default_beacon_key =
450 			debugfs_create_symlink("default_beacon_key",
451 					       sdata->vif.debugfs_dir, buf);
452 	} else {
453 		ieee80211_debugfs_key_remove_beacon_default(sdata);
454 	}
455 }
456 
457 void
ieee80211_debugfs_key_remove_beacon_default(struct ieee80211_sub_if_data * sdata)458 ieee80211_debugfs_key_remove_beacon_default(struct ieee80211_sub_if_data *sdata)
459 {
460 	if (!sdata)
461 		return;
462 
463 	debugfs_remove(sdata->debugfs.default_beacon_key);
464 	sdata->debugfs.default_beacon_key = NULL;
465 }
466 
ieee80211_debugfs_key_sta_del(struct ieee80211_key * key,struct sta_info * sta)467 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
468 				   struct sta_info *sta)
469 {
470 	debugfs_remove(key->debugfs.stalink);
471 	key->debugfs.stalink = NULL;
472 }
473