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debugfs_key.c
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1 /*
2  * Copyright 2003-2005 Devicescape Software, Inc.
3  * Copyright (c) 2006 Jiri Benc <[email protected]>
4  * Copyright 2007 Johannes Berg <[email protected]>
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*NUM_RX_DATA_QUEUES+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 < NUM_RX_DATA_QUEUES; 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 < NUM_RX_DATA_QUEUES + 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_key_read(struct file *file, char __user *userbuf,
203  size_t count, loff_t *ppos)
204 {
205  struct ieee80211_key *key = file->private_data;
206  int i, bufsize = 2 * key->conf.keylen + 2;
207  char *buf = kmalloc(bufsize, GFP_KERNEL);
208  char *p = buf;
209  ssize_t res;
210 
211  if (!buf)
212  return -ENOMEM;
213 
214  for (i = 0; i < key->conf.keylen; i++)
215  p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
216  p += scnprintf(p, bufsize+buf-p, "\n");
217  res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
218  kfree(buf);
219  return res;
220 }
221 KEY_OPS(key);
222 
223 #define DEBUGFS_ADD(name) \
224  debugfs_create_file(#name, 0400, key->debugfs.dir, \
225  key, &key_##name##_ops);
226 
227 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
228 {
229  static int keycount;
230  char buf[100];
231  struct sta_info *sta;
232 
233  if (!key->local->debugfs.keys)
234  return;
235 
236  sprintf(buf, "%d", keycount);
237  key->debugfs.cnt = keycount;
238  keycount++;
239  key->debugfs.dir = debugfs_create_dir(buf,
240  key->local->debugfs.keys);
241 
242  if (!key->debugfs.dir)
243  return;
244 
245  sta = key->sta;
246  if (sta) {
247  sprintf(buf, "../../netdev:%s/stations/%pM",
248  sta->sdata->name, sta->sta.addr);
249  key->debugfs.stalink =
250  debugfs_create_symlink("station", key->debugfs.dir, buf);
251  }
252 
253  DEBUGFS_ADD(keylen);
254  DEBUGFS_ADD(flags);
255  DEBUGFS_ADD(keyidx);
256  DEBUGFS_ADD(hw_key_idx);
257  DEBUGFS_ADD(tx_rx_count);
258  DEBUGFS_ADD(algorithm);
259  DEBUGFS_ADD(tx_spec);
260  DEBUGFS_ADD(rx_spec);
261  DEBUGFS_ADD(replays);
262  DEBUGFS_ADD(icverrors);
263  DEBUGFS_ADD(key);
264  DEBUGFS_ADD(ifindex);
265 };
266 
267 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
268 {
269  if (!key)
270  return;
271 
272  debugfs_remove_recursive(key->debugfs.dir);
273  key->debugfs.dir = NULL;
274 }
275 
276 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
277 {
278  char buf[50];
279  struct ieee80211_key *key;
280 
281  if (!sdata->debugfs.dir)
282  return;
283 
284  lockdep_assert_held(&sdata->local->key_mtx);
285 
286  if (sdata->debugfs.default_unicast_key) {
287  debugfs_remove(sdata->debugfs.default_unicast_key);
288  sdata->debugfs.default_unicast_key = NULL;
289  }
290 
291  if (sdata->default_unicast_key) {
292  key = key_mtx_dereference(sdata->local,
293  sdata->default_unicast_key);
294  sprintf(buf, "../keys/%d", key->debugfs.cnt);
295  sdata->debugfs.default_unicast_key =
296  debugfs_create_symlink("default_unicast_key",
297  sdata->debugfs.dir, buf);
298  }
299 
300  if (sdata->debugfs.default_multicast_key) {
301  debugfs_remove(sdata->debugfs.default_multicast_key);
302  sdata->debugfs.default_multicast_key = NULL;
303  }
304 
305  if (sdata->default_multicast_key) {
306  key = key_mtx_dereference(sdata->local,
307  sdata->default_multicast_key);
308  sprintf(buf, "../keys/%d", key->debugfs.cnt);
309  sdata->debugfs.default_multicast_key =
310  debugfs_create_symlink("default_multicast_key",
311  sdata->debugfs.dir, buf);
312  }
313 }
314 
315 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
316 {
317  char buf[50];
318  struct ieee80211_key *key;
319 
320  if (!sdata->debugfs.dir)
321  return;
322 
323  key = key_mtx_dereference(sdata->local,
324  sdata->default_mgmt_key);
325  if (key) {
326  sprintf(buf, "../keys/%d", key->debugfs.cnt);
327  sdata->debugfs.default_mgmt_key =
328  debugfs_create_symlink("default_mgmt_key",
329  sdata->debugfs.dir, buf);
330  } else
331  ieee80211_debugfs_key_remove_mgmt_default(sdata);
332 }
333 
334 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
335 {
336  if (!sdata)
337  return;
338 
339  debugfs_remove(sdata->debugfs.default_mgmt_key);
340  sdata->debugfs.default_mgmt_key = NULL;
341 }
342 
343 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
344  struct sta_info *sta)
345 {
346  debugfs_remove(key->debugfs.stalink);
347  key->debugfs.stalink = NULL;
348 }
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