ipv6,mcast: always hold idev->lock before mca_lock
[linux-3.10.git] / net / mac80211 / debugfs_key.c
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         if (sdata->debugfs.default_unicast_key) {
304                 debugfs_remove(sdata->debugfs.default_unicast_key);
305                 sdata->debugfs.default_unicast_key = NULL;
306         }
307
308         if (sdata->default_unicast_key) {
309                 key = key_mtx_dereference(sdata->local,
310                                           sdata->default_unicast_key);
311                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
312                 sdata->debugfs.default_unicast_key =
313                         debugfs_create_symlink("default_unicast_key",
314                                                sdata->vif.debugfs_dir, buf);
315         }
316
317         if (sdata->debugfs.default_multicast_key) {
318                 debugfs_remove(sdata->debugfs.default_multicast_key);
319                 sdata->debugfs.default_multicast_key = NULL;
320         }
321
322         if (sdata->default_multicast_key) {
323                 key = key_mtx_dereference(sdata->local,
324                                           sdata->default_multicast_key);
325                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
326                 sdata->debugfs.default_multicast_key =
327                         debugfs_create_symlink("default_multicast_key",
328                                                sdata->vif.debugfs_dir, buf);
329         }
330 }
331
332 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
333 {
334         char buf[50];
335         struct ieee80211_key *key;
336
337         if (!sdata->vif.debugfs_dir)
338                 return;
339
340         key = key_mtx_dereference(sdata->local,
341                                   sdata->default_mgmt_key);
342         if (key) {
343                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
344                 sdata->debugfs.default_mgmt_key =
345                         debugfs_create_symlink("default_mgmt_key",
346                                                sdata->vif.debugfs_dir, buf);
347         } else
348                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
349 }
350
351 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
352 {
353         if (!sdata)
354                 return;
355
356         debugfs_remove(sdata->debugfs.default_mgmt_key);
357         sdata->debugfs.default_mgmt_key = NULL;
358 }
359
360 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
361                                    struct sta_info *sta)
362 {
363         debugfs_remove(key->debugfs.stalink);
364         key->debugfs.stalink = NULL;
365 }