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_READ(ifindex, sdata->name, "%s\n");
  61 KEY_OPS(ifindex);
  62
  63 static ssize_t key_algorithm_read(struct file *file,
  64                                   char __user *userbuf,
  65                                   size_t count, loff_t *ppos)
  66 {
  67         char buf[15];
  68         struct ieee80211_key *key = file->private_data;
  69         u32 c = key->conf.cipher;
  70
  71         sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
  72                 c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
  73         return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
  74 }
  75 KEY_OPS(algorithm);
  76
  77 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  78                                 size_t count, loff_t *ppos)
  79 {
  80         u64 pn;
  81         char buf[20];
  82         int len;
  83         struct ieee80211_key *key = file->private_data;
  84
  85         switch (key->conf.cipher) {
  86         case WLAN_CIPHER_SUITE_WEP40:
  87         case WLAN_CIPHER_SUITE_WEP104:
  88                 len = scnprintf(buf, sizeof(buf), "\n");
  89                 break;
  90         case WLAN_CIPHER_SUITE_TKIP:
  91                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
  92                                 key->u.tkip.tx.iv32,
  93                                 key->u.tkip.tx.iv16);
  94                 break;
  95         case WLAN_CIPHER_SUITE_CCMP:
  96         case WLAN_CIPHER_SUITE_CCMP_256:
  97         case WLAN_CIPHER_SUITE_AES_CMAC:
  98         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
  99         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 100         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 101         case WLAN_CIPHER_SUITE_GCMP:
 102         case WLAN_CIPHER_SUITE_GCMP_256:
 103                 pn = atomic64_read(&key->conf.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         case WLAN_CIPHER_SUITE_CCMP_256:
 138                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 139                         rpn = key->u.ccmp.rx_pn[i];
 140                         p += scnprintf(p, sizeof(buf)+buf-p,
 141                                        "%02x%02x%02x%02x%02x%02x\n",
 142                                        rpn[0], rpn[1], rpn[2],
 143                                        rpn[3], rpn[4], rpn[5]);
 144                 }
 145                 len = p - buf;
 146                 break;
 147         case WLAN_CIPHER_SUITE_AES_CMAC:
 148         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 149                 rpn = key->u.aes_cmac.rx_pn;
 150                 p += scnprintf(p, sizeof(buf)+buf-p,
 151                                "%02x%02x%02x%02x%02x%02x\n",
 152                                rpn[0], rpn[1], rpn[2],
 153                                rpn[3], rpn[4], rpn[5]);
 154                 len = p - buf;
 155                 break;
 156         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 157         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 158                 rpn = key->u.aes_gmac.rx_pn;
 159                 p += scnprintf(p, sizeof(buf)+buf-p,
 160                                "%02x%02x%02x%02x%02x%02x\n",
 161                                rpn[0], rpn[1], rpn[2],
 162                                rpn[3], rpn[4], rpn[5]);
 163                 len = p - buf;
 164                 break;
 165         case WLAN_CIPHER_SUITE_GCMP:
 166         case WLAN_CIPHER_SUITE_GCMP_256:
 167                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 168                         rpn = key->u.gcmp.rx_pn[i];
 169                         p += scnprintf(p, sizeof(buf)+buf-p,
 170                                        "%02x%02x%02x%02x%02x%02x\n",
 171                                        rpn[0], rpn[1], rpn[2],
 172                                        rpn[3], rpn[4], rpn[5]);
 173                 }
 174                 len = p - buf;
 175                 break;
 176         default:
 177                 return 0;
 178         }
 179         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 180 }
 181 KEY_OPS(rx_spec);
 182
 183 static ssize_t key_replays_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_CCMP:
 192         case WLAN_CIPHER_SUITE_CCMP_256:
 193                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 194                 break;
 195         case WLAN_CIPHER_SUITE_AES_CMAC:
 196         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 197                 len = scnprintf(buf, sizeof(buf), "%u\n",
 198                                 key->u.aes_cmac.replays);
 199                 break;
 200         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 201         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 202                 len = scnprintf(buf, sizeof(buf), "%u\n",
 203                                 key->u.aes_gmac.replays);
 204                 break;
 205         case WLAN_CIPHER_SUITE_GCMP:
 206         case WLAN_CIPHER_SUITE_GCMP_256:
 207                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
 208                 break;
 209         default:
 210                 return 0;
 211         }
 212         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 213 }
 214 KEY_OPS(replays);
 215
 216 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 217                                   size_t count, loff_t *ppos)
 218 {
 219         struct ieee80211_key *key = file->private_data;
 220         char buf[20];
 221         int len;
 222
 223         switch (key->conf.cipher) {
 224         case WLAN_CIPHER_SUITE_AES_CMAC:
 225         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 226                 len = scnprintf(buf, sizeof(buf), "%u\n",
 227                                 key->u.aes_cmac.icverrors);
 228                 break;
 229         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 230         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 231                 len = scnprintf(buf, sizeof(buf), "%u\n",
 232                                 key->u.aes_gmac.icverrors);
 233                 break;
 234         default:
 235                 return 0;
 236         }
 237         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 238 }
 239 KEY_OPS(icverrors);
 240
 241 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
 242                                      size_t count, loff_t *ppos)
 243 {
 244         struct ieee80211_key *key = file->private_data;
 245         char buf[20];
 246         int len;
 247
 248         if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
 249                 return -EINVAL;
 250
 251         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
 252
 253         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 254 }
 255 KEY_OPS(mic_failures);
 256
 257 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 258                             size_t count, loff_t *ppos)
 259 {
 260         struct ieee80211_key *key = file->private_data;
 261         int i, bufsize = 2 * key->conf.keylen + 2;
 262         char *buf = kmalloc(bufsize, GFP_KERNEL);
 263         char *p = buf;
 264         ssize_t res;
 265
 266         if (!buf)
 267                 return -ENOMEM;
 268
 269         for (i = 0; i < key->conf.keylen; i++)
 270                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 271         p += scnprintf(p, bufsize+buf-p, "\n");
 272         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 273         kfree(buf);
 274         return res;
 275 }
 276 KEY_OPS(key);
 277
 278 #define DEBUGFS_ADD(name) \
 279         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 280                             key, &key_##name##_ops);
 281
 282 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 283 {
 284         static int keycount;
 285         char buf[100];
 286         struct sta_info *sta;
 287
 288         if (!key->local->debugfs.keys)
 289                 return;
 290
 291         sprintf(buf, "%d", keycount);
 292         key->debugfs.cnt = keycount;
 293         keycount++;
 294         key->debugfs.dir = debugfs_create_dir(buf,
 295                                         key->local->debugfs.keys);
 296
 297         if (!key->debugfs.dir)
 298                 return;
 299
 300         sta = key->sta;
 301         if (sta) {
 302                 sprintf(buf, "../../netdev:%s/stations/%pM",
 303                         sta->sdata->name, sta->sta.addr);
 304                 key->debugfs.stalink =
 305                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 306         }
 307
 308         DEBUGFS_ADD(keylen);
 309         DEBUGFS_ADD(flags);
 310         DEBUGFS_ADD(keyidx);
 311         DEBUGFS_ADD(hw_key_idx);
 312         DEBUGFS_ADD(algorithm);
 313         DEBUGFS_ADD(tx_spec);
 314         DEBUGFS_ADD(rx_spec);
 315         DEBUGFS_ADD(replays);
 316         DEBUGFS_ADD(icverrors);
 317         DEBUGFS_ADD(mic_failures);
 318         DEBUGFS_ADD(key);
 319         DEBUGFS_ADD(ifindex);
 320 };
 321
 322 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 323 {
 324         if (!key)
 325                 return;
 326
 327         debugfs_remove_recursive(key->debugfs.dir);
 328         key->debugfs.dir = NULL;
 329 }
 330
 331 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
 332 {
 333         char buf[50];
 334         struct ieee80211_key *key;
 335
 336         if (!sdata->vif.debugfs_dir)
 337                 return;
 338
 339         lockdep_assert_held(&sdata->local->key_mtx);
 340
 341         debugfs_remove(sdata->debugfs.default_unicast_key);
 342         sdata->debugfs.default_unicast_key = NULL;
 343
 344         if (sdata->default_unicast_key) {
 345                 key = key_mtx_dereference(sdata->local,
 346                                           sdata->default_unicast_key);
 347                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 348                 sdata->debugfs.default_unicast_key =
 349                         debugfs_create_symlink("default_unicast_key",
 350                                                sdata->vif.debugfs_dir, buf);
 351         }
 352
 353         debugfs_remove(sdata->debugfs.default_multicast_key);
 354         sdata->debugfs.default_multicast_key = NULL;
 355
 356         if (sdata->default_multicast_key) {
 357                 key = key_mtx_dereference(sdata->local,
 358                                           sdata->default_multicast_key);
 359                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 360                 sdata->debugfs.default_multicast_key =
 361                         debugfs_create_symlink("default_multicast_key",
 362                                                sdata->vif.debugfs_dir, buf);
 363         }
 364 }
 365
 366 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 367 {
 368         char buf[50];
 369         struct ieee80211_key *key;
 370
 371         if (!sdata->vif.debugfs_dir)
 372                 return;
 373
 374         key = key_mtx_dereference(sdata->local,
 375                                   sdata->default_mgmt_key);
 376         if (key) {
 377                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 378                 sdata->debugfs.default_mgmt_key =
 379                         debugfs_create_symlink("default_mgmt_key",
 380                                                sdata->vif.debugfs_dir, buf);
 381         } else
 382                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 383 }
 384
 385 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 386 {
 387         if (!sdata)
 388                 return;
 389
 390         debugfs_remove(sdata->debugfs.default_mgmt_key);
 391         sdata->debugfs.default_mgmt_key = NULL;
 392 }
 393
 394 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 395                                    struct sta_info *sta)
 396 {
 397         debugfs_remove(key->debugfs.stalink);
 398         key->debugfs.stalink = NULL;
 399 }