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  * 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 }