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TOMOYO Linux Cross Reference
Linux/net/mac80211/debugfs_key.c

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  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  * Copyright (C) 2015   Intel Deutschland GmbH
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 
 12 #include <linux/kobject.h>
 13 #include <linux/slab.h>
 14 #include "ieee80211_i.h"
 15 #include "key.h"
 16 #include "debugfs.h"
 17 #include "debugfs_key.h"
 18 
 19 #define KEY_READ(name, prop, format_string)                             \
 20 static ssize_t key_##name##_read(struct file *file,                     \
 21                                  char __user *userbuf,                  \
 22                                  size_t count, loff_t *ppos)            \
 23 {                                                                       \
 24         struct ieee80211_key *key = file->private_data;                 \
 25         return mac80211_format_buffer(userbuf, count, ppos,             \
 26                                       format_string, key->prop);        \
 27 }
 28 #define KEY_READ_D(name) KEY_READ(name, name, "%d\n")
 29 #define KEY_READ_X(name) KEY_READ(name, name, "0x%x\n")
 30 
 31 #define KEY_OPS(name)                                                   \
 32 static const struct file_operations key_ ##name## _ops = {              \
 33         .read = key_##name##_read,                                      \
 34         .open = simple_open,                                            \
 35         .llseek = generic_file_llseek,                                  \
 36 }
 37 
 38 #define KEY_OPS_W(name)                                                 \
 39 static const struct file_operations key_ ##name## _ops = {              \
 40         .read = key_##name##_read,                                      \
 41         .write = key_##name##_write,                                    \
 42         .open = simple_open,                                            \
 43         .llseek = generic_file_llseek,                                  \
 44 }
 45 
 46 #define KEY_FILE(name, format)                                          \
 47                  KEY_READ_##format(name)                                \
 48                  KEY_OPS(name)
 49 
 50 #define KEY_CONF_READ(name, format_string)                              \
 51         KEY_READ(conf_##name, conf.name, format_string)
 52 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, "%d\n")
 53 
 54 #define KEY_CONF_OPS(name)                                              \
 55 static const struct file_operations key_ ##name## _ops = {              \
 56         .read = key_conf_##name##_read,                                 \
 57         .open = simple_open,                                            \
 58         .llseek = generic_file_llseek,                                  \
 59 }
 60 
 61 #define KEY_CONF_FILE(name, format)                                     \
 62                  KEY_CONF_READ_##format(name)                           \
 63                  KEY_CONF_OPS(name)
 64 
 65 KEY_CONF_FILE(keylen, D);
 66 KEY_CONF_FILE(keyidx, D);
 67 KEY_CONF_FILE(hw_key_idx, D);
 68 KEY_FILE(flags, X);
 69 KEY_READ(ifindex, sdata->name, "%s\n");
 70 KEY_OPS(ifindex);
 71 
 72 static ssize_t key_algorithm_read(struct file *file,
 73                                   char __user *userbuf,
 74                                   size_t count, loff_t *ppos)
 75 {
 76         char buf[15];
 77         struct ieee80211_key *key = file->private_data;
 78         u32 c = key->conf.cipher;
 79 
 80         sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
 81                 c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
 82         return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
 83 }
 84 KEY_OPS(algorithm);
 85 
 86 static ssize_t key_tx_spec_write(struct file *file, const char __user *userbuf,
 87                                  size_t count, loff_t *ppos)
 88 {
 89         struct ieee80211_key *key = file->private_data;
 90         u64 pn;
 91         int ret;
 92 
 93         switch (key->conf.cipher) {
 94         case WLAN_CIPHER_SUITE_WEP40:
 95         case WLAN_CIPHER_SUITE_WEP104:
 96                 return -EINVAL;
 97         case WLAN_CIPHER_SUITE_TKIP:
 98                 /* not supported yet */
 99                 return -EOPNOTSUPP;
100         case WLAN_CIPHER_SUITE_CCMP:
101         case WLAN_CIPHER_SUITE_CCMP_256:
102         case WLAN_CIPHER_SUITE_AES_CMAC:
103         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
104         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
105         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
106         case WLAN_CIPHER_SUITE_GCMP:
107         case WLAN_CIPHER_SUITE_GCMP_256:
108                 ret = kstrtou64_from_user(userbuf, count, 16, &pn);
109                 if (ret)
110                         return ret;
111                 /* PN is a 48-bit counter */
112                 if (pn >= (1ULL << 48))
113                         return -ERANGE;
114                 atomic64_set(&key->conf.tx_pn, pn);
115                 return count;
116         default:
117                 return 0;
118         }
119 }
120 
121 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
122                                 size_t count, loff_t *ppos)
123 {
124         u64 pn;
125         char buf[20];
126         int len;
127         struct ieee80211_key *key = file->private_data;
128 
129         switch (key->conf.cipher) {
130         case WLAN_CIPHER_SUITE_WEP40:
131         case WLAN_CIPHER_SUITE_WEP104:
132                 len = scnprintf(buf, sizeof(buf), "\n");
133                 break;
134         case WLAN_CIPHER_SUITE_TKIP:
135                 pn = atomic64_read(&key->conf.tx_pn);
136                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
137                                 TKIP_PN_TO_IV32(pn),
138                                 TKIP_PN_TO_IV16(pn));
139                 break;
140         case WLAN_CIPHER_SUITE_CCMP:
141         case WLAN_CIPHER_SUITE_CCMP_256:
142         case WLAN_CIPHER_SUITE_AES_CMAC:
143         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
144         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
145         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
146         case WLAN_CIPHER_SUITE_GCMP:
147         case WLAN_CIPHER_SUITE_GCMP_256:
148                 pn = atomic64_read(&key->conf.tx_pn);
149                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
150                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
151                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
152                 break;
153         default:
154                 return 0;
155         }
156         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
157 }
158 KEY_OPS_W(tx_spec);
159 
160 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
161                                 size_t count, loff_t *ppos)
162 {
163         struct ieee80211_key *key = file->private_data;
164         char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
165         int i, len;
166         const u8 *rpn;
167 
168         switch (key->conf.cipher) {
169         case WLAN_CIPHER_SUITE_WEP40:
170         case WLAN_CIPHER_SUITE_WEP104:
171                 len = scnprintf(buf, sizeof(buf), "\n");
172                 break;
173         case WLAN_CIPHER_SUITE_TKIP:
174                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
175                         p += scnprintf(p, sizeof(buf)+buf-p,
176                                        "%08x %04x\n",
177                                        key->u.tkip.rx[i].iv32,
178                                        key->u.tkip.rx[i].iv16);
179                 len = p - buf;
180                 break;
181         case WLAN_CIPHER_SUITE_CCMP:
182         case WLAN_CIPHER_SUITE_CCMP_256:
183                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
184                         rpn = key->u.ccmp.rx_pn[i];
185                         p += scnprintf(p, sizeof(buf)+buf-p,
186                                        "%02x%02x%02x%02x%02x%02x\n",
187                                        rpn[0], rpn[1], rpn[2],
188                                        rpn[3], rpn[4], rpn[5]);
189                 }
190                 len = p - buf;
191                 break;
192         case WLAN_CIPHER_SUITE_AES_CMAC:
193         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
194                 rpn = key->u.aes_cmac.rx_pn;
195                 p += scnprintf(p, sizeof(buf)+buf-p,
196                                "%02x%02x%02x%02x%02x%02x\n",
197                                rpn[0], rpn[1], rpn[2],
198                                rpn[3], rpn[4], rpn[5]);
199                 len = p - buf;
200                 break;
201         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
202         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
203                 rpn = key->u.aes_gmac.rx_pn;
204                 p += scnprintf(p, sizeof(buf)+buf-p,
205                                "%02x%02x%02x%02x%02x%02x\n",
206                                rpn[0], rpn[1], rpn[2],
207                                rpn[3], rpn[4], rpn[5]);
208                 len = p - buf;
209                 break;
210         case WLAN_CIPHER_SUITE_GCMP:
211         case WLAN_CIPHER_SUITE_GCMP_256:
212                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
213                         rpn = key->u.gcmp.rx_pn[i];
214                         p += scnprintf(p, sizeof(buf)+buf-p,
215                                        "%02x%02x%02x%02x%02x%02x\n",
216                                        rpn[0], rpn[1], rpn[2],
217                                        rpn[3], rpn[4], rpn[5]);
218                 }
219                 len = p - buf;
220                 break;
221         default:
222                 return 0;
223         }
224         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
225 }
226 KEY_OPS(rx_spec);
227 
228 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
229                                 size_t count, loff_t *ppos)
230 {
231         struct ieee80211_key *key = file->private_data;
232         char buf[20];
233         int len;
234 
235         switch (key->conf.cipher) {
236         case WLAN_CIPHER_SUITE_CCMP:
237         case WLAN_CIPHER_SUITE_CCMP_256:
238                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
239                 break;
240         case WLAN_CIPHER_SUITE_AES_CMAC:
241         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
242                 len = scnprintf(buf, sizeof(buf), "%u\n",
243                                 key->u.aes_cmac.replays);
244                 break;
245         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
246         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
247                 len = scnprintf(buf, sizeof(buf), "%u\n",
248                                 key->u.aes_gmac.replays);
249                 break;
250         case WLAN_CIPHER_SUITE_GCMP:
251         case WLAN_CIPHER_SUITE_GCMP_256:
252                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
253                 break;
254         default:
255                 return 0;
256         }
257         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
258 }
259 KEY_OPS(replays);
260 
261 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
262                                   size_t count, loff_t *ppos)
263 {
264         struct ieee80211_key *key = file->private_data;
265         char buf[20];
266         int len;
267 
268         switch (key->conf.cipher) {
269         case WLAN_CIPHER_SUITE_AES_CMAC:
270         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
271                 len = scnprintf(buf, sizeof(buf), "%u\n",
272                                 key->u.aes_cmac.icverrors);
273                 break;
274         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
275         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
276                 len = scnprintf(buf, sizeof(buf), "%u\n",
277                                 key->u.aes_gmac.icverrors);
278                 break;
279         default:
280                 return 0;
281         }
282         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
283 }
284 KEY_OPS(icverrors);
285 
286 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
287                                      size_t count, loff_t *ppos)
288 {
289         struct ieee80211_key *key = file->private_data;
290         char buf[20];
291         int len;
292 
293         if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
294                 return -EINVAL;
295 
296         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
297 
298         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
299 }
300 KEY_OPS(mic_failures);
301 
302 static ssize_t key_key_read(struct file *file, char __user *userbuf,
303                             size_t count, loff_t *ppos)
304 {
305         struct ieee80211_key *key = file->private_data;
306         int i, bufsize = 2 * key->conf.keylen + 2;
307         char *buf = kmalloc(bufsize, GFP_KERNEL);
308         char *p = buf;
309         ssize_t res;
310 
311         if (!buf)
312                 return -ENOMEM;
313 
314         for (i = 0; i < key->conf.keylen; i++)
315                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
316         p += scnprintf(p, bufsize+buf-p, "\n");
317         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
318         kfree(buf);
319         return res;
320 }
321 KEY_OPS(key);
322 
323 #define DEBUGFS_ADD(name) \
324         debugfs_create_file(#name, 0400, key->debugfs.dir, \
325                             key, &key_##name##_ops);
326 #define DEBUGFS_ADD_W(name) \
327         debugfs_create_file(#name, 0600, key->debugfs.dir, \
328                             key, &key_##name##_ops);
329 
330 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
331 {
332         static int keycount;
333         char buf[100];
334         struct sta_info *sta;
335 
336         if (!key->local->debugfs.keys)
337                 return;
338 
339         sprintf(buf, "%d", keycount);
340         key->debugfs.cnt = keycount;
341         keycount++;
342         key->debugfs.dir = debugfs_create_dir(buf,
343                                         key->local->debugfs.keys);
344 
345         if (!key->debugfs.dir)
346                 return;
347 
348         sta = key->sta;
349         if (sta) {
350                 sprintf(buf, "../../netdev:%s/stations/%pM",
351                         sta->sdata->name, sta->sta.addr);
352                 key->debugfs.stalink =
353                         debugfs_create_symlink("station", key->debugfs.dir, buf);
354         }
355 
356         DEBUGFS_ADD(keylen);
357         DEBUGFS_ADD(flags);
358         DEBUGFS_ADD(keyidx);
359         DEBUGFS_ADD(hw_key_idx);
360         DEBUGFS_ADD(algorithm);
361         DEBUGFS_ADD_W(tx_spec);
362         DEBUGFS_ADD(rx_spec);
363         DEBUGFS_ADD(replays);
364         DEBUGFS_ADD(icverrors);
365         DEBUGFS_ADD(mic_failures);
366         DEBUGFS_ADD(key);
367         DEBUGFS_ADD(ifindex);
368 };
369 
370 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
371 {
372         if (!key)
373                 return;
374 
375         debugfs_remove_recursive(key->debugfs.dir);
376         key->debugfs.dir = NULL;
377 }
378 
379 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
380 {
381         char buf[50];
382         struct ieee80211_key *key;
383 
384         if (!sdata->vif.debugfs_dir)
385                 return;
386 
387         lockdep_assert_held(&sdata->local->key_mtx);
388 
389         debugfs_remove(sdata->debugfs.default_unicast_key);
390         sdata->debugfs.default_unicast_key = NULL;
391 
392         if (sdata->default_unicast_key) {
393                 key = key_mtx_dereference(sdata->local,
394                                           sdata->default_unicast_key);
395                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
396                 sdata->debugfs.default_unicast_key =
397                         debugfs_create_symlink("default_unicast_key",
398                                                sdata->vif.debugfs_dir, buf);
399         }
400 
401         debugfs_remove(sdata->debugfs.default_multicast_key);
402         sdata->debugfs.default_multicast_key = NULL;
403 
404         if (sdata->default_multicast_key) {
405                 key = key_mtx_dereference(sdata->local,
406                                           sdata->default_multicast_key);
407                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
408                 sdata->debugfs.default_multicast_key =
409                         debugfs_create_symlink("default_multicast_key",
410                                                sdata->vif.debugfs_dir, buf);
411         }
412 }
413 
414 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
415 {
416         char buf[50];
417         struct ieee80211_key *key;
418 
419         if (!sdata->vif.debugfs_dir)
420                 return;
421 
422         key = key_mtx_dereference(sdata->local,
423                                   sdata->default_mgmt_key);
424         if (key) {
425                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
426                 sdata->debugfs.default_mgmt_key =
427                         debugfs_create_symlink("default_mgmt_key",
428                                                sdata->vif.debugfs_dir, buf);
429         } else
430                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
431 }
432 
433 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
434 {
435         if (!sdata)
436                 return;
437 
438         debugfs_remove(sdata->debugfs.default_mgmt_key);
439         sdata->debugfs.default_mgmt_key = NULL;
440 }
441 
442 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
443                                    struct sta_info *sta)
444 {
445         debugfs_remove(key->debugfs.stalink);
446         key->debugfs.stalink = NULL;
447 }
448 

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