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         case WLAN_CIPHER_SUITE_CCMP_256:
  98                 pn = atomic64_read(&key->u.ccmp.tx_pn);
  99                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 100                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
 101                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
 102                 break;
 103         case WLAN_CIPHER_SUITE_AES_CMAC:
 104         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 105                 pn = atomic64_read(&key->u.aes_cmac.tx_pn);
 106                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 107                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
 108                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
 109                 break;
 110         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 111         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 112                 pn = atomic64_read(&key->u.aes_gmac.tx_pn);
 113                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 114                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
 115                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
 116                 break;
 117         case WLAN_CIPHER_SUITE_GCMP:
 118         case WLAN_CIPHER_SUITE_GCMP_256:
 119                 pn = atomic64_read(&key->u.gcmp.tx_pn);
 120                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 121                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
 122                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
 123                 break;
 124         default:
 125                 return 0;
 126         }
 127         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 128 }
 129 KEY_OPS(tx_spec);
 130
 131 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 132                                 size_t count, loff_t *ppos)
 133 {
 134         struct ieee80211_key *key = file->private_data;
 135         char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
 136         int i, len;
 137         const u8 *rpn;
 138
 139         switch (key->conf.cipher) {
 140         case WLAN_CIPHER_SUITE_WEP40:
 141         case WLAN_CIPHER_SUITE_WEP104:
 142                 len = scnprintf(buf, sizeof(buf), "\n");
 143                 break;
 144         case WLAN_CIPHER_SUITE_TKIP:
 145                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
 146                         p += scnprintf(p, sizeof(buf)+buf-p,
 147                                        "%08x %04x\n",
 148                                        key->u.tkip.rx[i].iv32,
 149                                        key->u.tkip.rx[i].iv16);
 150                 len = p - buf;
 151                 break;
 152         case WLAN_CIPHER_SUITE_CCMP:
 153         case WLAN_CIPHER_SUITE_CCMP_256:
 154                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 155                         rpn = key->u.ccmp.rx_pn[i];
 156                         p += scnprintf(p, sizeof(buf)+buf-p,
 157                                        "%02x%02x%02x%02x%02x%02x\n",
 158                                        rpn[0], rpn[1], rpn[2],
 159                                        rpn[3], rpn[4], rpn[5]);
 160                 }
 161                 len = p - buf;
 162                 break;
 163         case WLAN_CIPHER_SUITE_AES_CMAC:
 164         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 165                 rpn = key->u.aes_cmac.rx_pn;
 166                 p += scnprintf(p, sizeof(buf)+buf-p,
 167                                "%02x%02x%02x%02x%02x%02x\n",
 168                                rpn[0], rpn[1], rpn[2],
 169                                rpn[3], rpn[4], rpn[5]);
 170                 len = p - buf;
 171                 break;
 172         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 173         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 174                 rpn = key->u.aes_gmac.rx_pn;
 175                 p += scnprintf(p, sizeof(buf)+buf-p,
 176                                "%02x%02x%02x%02x%02x%02x\n",
 177                                rpn[0], rpn[1], rpn[2],
 178                                rpn[3], rpn[4], rpn[5]);
 179                 len = p - buf;
 180                 break;
 181         case WLAN_CIPHER_SUITE_GCMP:
 182         case WLAN_CIPHER_SUITE_GCMP_256:
 183                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 184                         rpn = key->u.gcmp.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         default:
 193                 return 0;
 194         }
 195         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 196 }
 197 KEY_OPS(rx_spec);
 198
 199 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 200                                 size_t count, loff_t *ppos)
 201 {
 202         struct ieee80211_key *key = file->private_data;
 203         char buf[20];
 204         int len;
 205
 206         switch (key->conf.cipher) {
 207         case WLAN_CIPHER_SUITE_CCMP:
 208         case WLAN_CIPHER_SUITE_CCMP_256:
 209                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 210                 break;
 211         case WLAN_CIPHER_SUITE_AES_CMAC:
 212         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 213                 len = scnprintf(buf, sizeof(buf), "%u\n",
 214                                 key->u.aes_cmac.replays);
 215                 break;
 216         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 217         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 218                 len = scnprintf(buf, sizeof(buf), "%u\n",
 219                                 key->u.aes_gmac.replays);
 220                 break;
 221         case WLAN_CIPHER_SUITE_GCMP:
 222         case WLAN_CIPHER_SUITE_GCMP_256:
 223                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
 224                 break;
 225         default:
 226                 return 0;
 227         }
 228         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 229 }
 230 KEY_OPS(replays);
 231
 232 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 233                                   size_t count, loff_t *ppos)
 234 {
 235         struct ieee80211_key *key = file->private_data;
 236         char buf[20];
 237         int len;
 238
 239         switch (key->conf.cipher) {
 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.icverrors);
 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.icverrors);
 249                 break;
 250         default:
 251                 return 0;
 252         }
 253         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 254 }
 255 KEY_OPS(icverrors);
 256
 257 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
 258                                      size_t count, loff_t *ppos)
 259 {
 260         struct ieee80211_key *key = file->private_data;
 261         char buf[20];
 262         int len;
 263
 264         if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
 265                 return -EINVAL;
 266
 267         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
 268
 269         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 270 }
 271 KEY_OPS(mic_failures);
 272
 273 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 274                             size_t count, loff_t *ppos)
 275 {
 276         struct ieee80211_key *key = file->private_data;
 277         int i, bufsize = 2 * key->conf.keylen + 2;
 278         char *buf = kmalloc(bufsize, GFP_KERNEL);
 279         char *p = buf;
 280         ssize_t res;
 281
 282         if (!buf)
 283                 return -ENOMEM;
 284
 285         for (i = 0; i < key->conf.keylen; i++)
 286                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 287         p += scnprintf(p, bufsize+buf-p, "\n");
 288         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 289         kfree(buf);
 290         return res;
 291 }
 292 KEY_OPS(key);
 293
 294 #define DEBUGFS_ADD(name) \
 295         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 296                             key, &key_##name##_ops);
 297
 298 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 299 {
 300         static int keycount;
 301         char buf[100];
 302         struct sta_info *sta;
 303
 304         if (!key->local->debugfs.keys)
 305                 return;
 306
 307         sprintf(buf, "%d", keycount);
 308         key->debugfs.cnt = keycount;
 309         keycount++;
 310         key->debugfs.dir = debugfs_create_dir(buf,
 311                                         key->local->debugfs.keys);
 312
 313         if (!key->debugfs.dir)
 314                 return;
 315
 316         sta = key->sta;
 317         if (sta) {
 318                 sprintf(buf, "../../netdev:%s/stations/%pM",
 319                         sta->sdata->name, sta->sta.addr);
 320                 key->debugfs.stalink =
 321                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 322         }
 323
 324         DEBUGFS_ADD(keylen);
 325         DEBUGFS_ADD(flags);
 326         DEBUGFS_ADD(keyidx);
 327         DEBUGFS_ADD(hw_key_idx);
 328         DEBUGFS_ADD(tx_rx_count);
 329         DEBUGFS_ADD(algorithm);
 330         DEBUGFS_ADD(tx_spec);
 331         DEBUGFS_ADD(rx_spec);
 332         DEBUGFS_ADD(replays);
 333         DEBUGFS_ADD(icverrors);
 334         DEBUGFS_ADD(mic_failures);
 335         DEBUGFS_ADD(key);
 336         DEBUGFS_ADD(ifindex);
 337 };
 338
 339 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 340 {
 341         if (!key)
 342                 return;
 343
 344         debugfs_remove_recursive(key->debugfs.dir);
 345         key->debugfs.dir = NULL;
 346 }
 347
 348 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
 349 {
 350         char buf[50];
 351         struct ieee80211_key *key;
 352
 353         if (!sdata->vif.debugfs_dir)
 354                 return;
 355
 356         lockdep_assert_held(&sdata->local->key_mtx);
 357
 358         debugfs_remove(sdata->debugfs.default_unicast_key);
 359         sdata->debugfs.default_unicast_key = NULL;
 360
 361         if (sdata->default_unicast_key) {
 362                 key = key_mtx_dereference(sdata->local,
 363                                           sdata->default_unicast_key);
 364                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 365                 sdata->debugfs.default_unicast_key =
 366                         debugfs_create_symlink("default_unicast_key",
 367                                                sdata->vif.debugfs_dir, buf);
 368         }
 369
 370         debugfs_remove(sdata->debugfs.default_multicast_key);
 371         sdata->debugfs.default_multicast_key = NULL;
 372
 373         if (sdata->default_multicast_key) {
 374                 key = key_mtx_dereference(sdata->local,
 375                                           sdata->default_multicast_key);
 376                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 377                 sdata->debugfs.default_multicast_key =
 378                         debugfs_create_symlink("default_multicast_key",
 379                                                sdata->vif.debugfs_dir, buf);
 380         }
 381 }
 382
 383 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 384 {
 385         char buf[50];
 386         struct ieee80211_key *key;
 387
 388         if (!sdata->vif.debugfs_dir)
 389                 return;
 390
 391         key = key_mtx_dereference(sdata->local,
 392                                   sdata->default_mgmt_key);
 393         if (key) {
 394                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 395                 sdata->debugfs.default_mgmt_key =
 396                         debugfs_create_symlink("default_mgmt_key",
 397                                                sdata->vif.debugfs_dir, buf);
 398         } else
 399                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 400 }
 401
 402 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 403 {
 404         if (!sdata)
 405                 return;
 406
 407         debugfs_remove(sdata->debugfs.default_mgmt_key);
 408         sdata->debugfs.default_mgmt_key = NULL;
 409 }
 410
 411 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 412                                    struct sta_info *sta)
 413 {
 414         debugfs_remove(key->debugfs.stalink);
 415         key->debugfs.stalink = NULL;
 416 }