kernel/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                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
 136                                 key->u.tkip.tx.iv32,
 137                                 key->u.tkip.tx.iv16);
 138                 break;
 139         case WLAN_CIPHER_SUITE_CCMP:
 140         case WLAN_CIPHER_SUITE_CCMP_256:
 141         case WLAN_CIPHER_SUITE_AES_CMAC:
 142         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 143         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 144         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 145         case WLAN_CIPHER_SUITE_GCMP:
 146         case WLAN_CIPHER_SUITE_GCMP_256:
 147                 pn = atomic64_read(&key->conf.tx_pn);
 148                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 149                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
 150                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
 151                 break;
 152         default:
 153                 return 0;
 154         }
 155         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 156 }
 157 KEY_OPS_W(tx_spec);
 158
 159 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 160                                 size_t count, loff_t *ppos)
 161 {
 162         struct ieee80211_key *key = file->private_data;
 163         char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
 164         int i, len;
 165         const u8 *rpn;
 166
 167         switch (key->conf.cipher) {
 168         case WLAN_CIPHER_SUITE_WEP40:
 169         case WLAN_CIPHER_SUITE_WEP104:
 170                 len = scnprintf(buf, sizeof(buf), "\n");
 171                 break;
 172         case WLAN_CIPHER_SUITE_TKIP:
 173                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
 174                         p += scnprintf(p, sizeof(buf)+buf-p,
 175                                        "%08x %04x\n",
 176                                        key->u.tkip.rx[i].iv32,
 177                                        key->u.tkip.rx[i].iv16);
 178                 len = p - buf;
 179                 break;
 180         case WLAN_CIPHER_SUITE_CCMP:
 181         case WLAN_CIPHER_SUITE_CCMP_256:
 182                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 183                         rpn = key->u.ccmp.rx_pn[i];
 184                         p += scnprintf(p, sizeof(buf)+buf-p,
 185                                        "%02x%02x%02x%02x%02x%02x\n",
 186                                        rpn[0], rpn[1], rpn[2],
 187                                        rpn[3], rpn[4], rpn[5]);
 188                 }
 189                 len = p - buf;
 190                 break;
 191         case WLAN_CIPHER_SUITE_AES_CMAC:
 192         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 193                 rpn = key->u.aes_cmac.rx_pn;
 194                 p += scnprintf(p, sizeof(buf)+buf-p,
 195                                "%02x%02x%02x%02x%02x%02x\n",
 196                                rpn[0], rpn[1], rpn[2],
 197                                rpn[3], rpn[4], rpn[5]);
 198                 len = p - buf;
 199                 break;
 200         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 201         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 202                 rpn = key->u.aes_gmac.rx_pn;
 203                 p += scnprintf(p, sizeof(buf)+buf-p,
 204                                "%02x%02x%02x%02x%02x%02x\n",
 205                                rpn[0], rpn[1], rpn[2],
 206                                rpn[3], rpn[4], rpn[5]);
 207                 len = p - buf;
 208                 break;
 209         case WLAN_CIPHER_SUITE_GCMP:
 210         case WLAN_CIPHER_SUITE_GCMP_256:
 211                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 212                         rpn = key->u.gcmp.rx_pn[i];
 213                         p += scnprintf(p, sizeof(buf)+buf-p,
 214                                        "%02x%02x%02x%02x%02x%02x\n",
 215                                        rpn[0], rpn[1], rpn[2],
 216                                        rpn[3], rpn[4], rpn[5]);
 217                 }
 218                 len = p - buf;
 219                 break;
 220         default:
 221                 return 0;
 222         }
 223         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 224 }
 225 KEY_OPS(rx_spec);
 226
 227 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 228                                 size_t count, loff_t *ppos)
 229 {
 230         struct ieee80211_key *key = file->private_data;
 231         char buf[20];
 232         int len;
 233
 234         switch (key->conf.cipher) {
 235         case WLAN_CIPHER_SUITE_CCMP:
 236         case WLAN_CIPHER_SUITE_CCMP_256:
 237                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 238                 break;
 239         case WLAN_CIPHER_SUITE_AES_CMAC:
 240         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 241                 len = scnprintf(buf, sizeof(buf), "%u\n",
 242                                 key->u.aes_cmac.replays);
 243                 break;
 244         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 245         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 246                 len = scnprintf(buf, sizeof(buf), "%u\n",
 247                                 key->u.aes_gmac.replays);
 248                 break;
 249         case WLAN_CIPHER_SUITE_GCMP:
 250         case WLAN_CIPHER_SUITE_GCMP_256:
 251                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
 252                 break;
 253         default:
 254                 return 0;
 255         }
 256         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 257 }
 258 KEY_OPS(replays);
 259
 260 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 261                                   size_t count, loff_t *ppos)
 262 {
 263         struct ieee80211_key *key = file->private_data;
 264         char buf[20];
 265         int len;
 266
 267         switch (key->conf.cipher) {
 268         case WLAN_CIPHER_SUITE_AES_CMAC:
 269         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 270                 len = scnprintf(buf, sizeof(buf), "%u\n",
 271                                 key->u.aes_cmac.icverrors);
 272                 break;
 273         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 274         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 275                 len = scnprintf(buf, sizeof(buf), "%u\n",
 276                                 key->u.aes_gmac.icverrors);
 277                 break;
 278         default:
 279                 return 0;
 280         }
 281         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 282 }
 283 KEY_OPS(icverrors);
 284
 285 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
 286                                      size_t count, loff_t *ppos)
 287 {
 288         struct ieee80211_key *key = file->private_data;
 289         char buf[20];
 290         int len;
 291
 292         if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
 293                 return -EINVAL;
 294
 295         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
 296
 297         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 298 }
 299 KEY_OPS(mic_failures);
 300
 301 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 302                             size_t count, loff_t *ppos)
 303 {
 304         struct ieee80211_key *key = file->private_data;
 305         int i, bufsize = 2 * key->conf.keylen + 2;
 306         char *buf = kmalloc(bufsize, GFP_KERNEL);
 307         char *p = buf;
 308         ssize_t res;
 309
 310         if (!buf)
 311                 return -ENOMEM;
 312
 313         for (i = 0; i < key->conf.keylen; i++)
 314                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 315         p += scnprintf(p, bufsize+buf-p, "\n");
 316         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 317         kfree(buf);
 318         return res;
 319 }
 320 KEY_OPS(key);
 321
 322 #define DEBUGFS_ADD(name) \
 323         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 324                             key, &key_##name##_ops);
 325 #define DEBUGFS_ADD_W(name) \
 326         debugfs_create_file(#name, 0600, key->debugfs.dir, \
 327                             key, &key_##name##_ops);
 328
 329 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 330 {
 331         static int keycount;
 332         char buf[100];
 333         struct sta_info *sta;
 334
 335         if (!key->local->debugfs.keys)
 336                 return;
 337
 338         sprintf(buf, "%d", keycount);
 339         key->debugfs.cnt = keycount;
 340         keycount++;
 341         key->debugfs.dir = debugfs_create_dir(buf,
 342                                         key->local->debugfs.keys);
 343
 344         if (!key->debugfs.dir)
 345                 return;
 346
 347         sta = key->sta;
 348         if (sta) {
 349                 sprintf(buf, "../../netdev:%s/stations/%pM",
 350                         sta->sdata->name, sta->sta.addr);
 351                 key->debugfs.stalink =
 352                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 353         }
 354
 355         DEBUGFS_ADD(keylen);
 356         DEBUGFS_ADD(flags);
 357         DEBUGFS_ADD(keyidx);
 358         DEBUGFS_ADD(hw_key_idx);
 359         DEBUGFS_ADD(algorithm);
 360         DEBUGFS_ADD_W(tx_spec);
 361         DEBUGFS_ADD(rx_spec);
 362         DEBUGFS_ADD(replays);
 363         DEBUGFS_ADD(icverrors);
 364         DEBUGFS_ADD(mic_failures);
 365         DEBUGFS_ADD(key);
 366         DEBUGFS_ADD(ifindex);
 367 };
 368
 369 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 370 {
 371         if (!key)
 372                 return;
 373
 374         debugfs_remove_recursive(key->debugfs.dir);
 375         key->debugfs.dir = NULL;
 376 }
 377
 378 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
 379 {
 380         char buf[50];
 381         struct ieee80211_key *key;
 382
 383         if (!sdata->vif.debugfs_dir)
 384                 return;
 385
 386         lockdep_assert_held(&sdata->local->key_mtx);
 387
 388         debugfs_remove(sdata->debugfs.default_unicast_key);
 389         sdata->debugfs.default_unicast_key = NULL;
 390
 391         if (sdata->default_unicast_key) {
 392                 key = key_mtx_dereference(sdata->local,
 393                                           sdata->default_unicast_key);
 394                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 395                 sdata->debugfs.default_unicast_key =
 396                         debugfs_create_symlink("default_unicast_key",
 397                                                sdata->vif.debugfs_dir, buf);
 398         }
 399
 400         debugfs_remove(sdata->debugfs.default_multicast_key);
 401         sdata->debugfs.default_multicast_key = NULL;
 402
 403         if (sdata->default_multicast_key) {
 404                 key = key_mtx_dereference(sdata->local,
 405                                           sdata->default_multicast_key);
 406                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 407                 sdata->debugfs.default_multicast_key =
 408                         debugfs_create_symlink("default_multicast_key",
 409                                                sdata->vif.debugfs_dir, buf);
 410         }
 411 }
 412
 413 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 414 {
 415         char buf[50];
 416         struct ieee80211_key *key;
 417
 418         if (!sdata->vif.debugfs_dir)
 419                 return;
 420
 421         key = key_mtx_dereference(sdata->local,
 422                                   sdata->default_mgmt_key);
 423         if (key) {
 424                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 425                 sdata->debugfs.default_mgmt_key =
 426                         debugfs_create_symlink("default_mgmt_key",
 427                                                sdata->vif.debugfs_dir, buf);
 428         } else
 429                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 430 }
 431
 432 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 433 {
 434         if (!sdata)
 435                 return;
 436
 437         debugfs_remove(sdata->debugfs.default_mgmt_key);
 438         sdata->debugfs.default_mgmt_key = NULL;
 439 }
 440
 441 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 442                                    struct sta_info *sta)
 443 {
 444         debugfs_remove(key->debugfs.stalink);
 445         key->debugfs.stalink = NULL;
 446 }