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_GCMP:
 111         case WLAN_CIPHER_SUITE_GCMP_256:
 112                 pn = atomic64_read(&key->u.gcmp.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         default:
 118                 return 0;
 119         }
 120         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 121 }
 122 KEY_OPS(tx_spec);
 123
 124 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 125                                 size_t count, loff_t *ppos)
 126 {
 127         struct ieee80211_key *key = file->private_data;
 128         char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
 129         int i, len;
 130         const u8 *rpn;
 131
 132         switch (key->conf.cipher) {
 133         case WLAN_CIPHER_SUITE_WEP40:
 134         case WLAN_CIPHER_SUITE_WEP104:
 135                 len = scnprintf(buf, sizeof(buf), "\n");
 136                 break;
 137         case WLAN_CIPHER_SUITE_TKIP:
 138                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
 139                         p += scnprintf(p, sizeof(buf)+buf-p,
 140                                        "%08x %04x\n",
 141                                        key->u.tkip.rx[i].iv32,
 142                                        key->u.tkip.rx[i].iv16);
 143                 len = p - buf;
 144                 break;
 145         case WLAN_CIPHER_SUITE_CCMP:
 146         case WLAN_CIPHER_SUITE_CCMP_256:
 147                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 148                         rpn = key->u.ccmp.rx_pn[i];
 149                         p += scnprintf(p, sizeof(buf)+buf-p,
 150                                        "%02x%02x%02x%02x%02x%02x\n",
 151                                        rpn[0], rpn[1], rpn[2],
 152                                        rpn[3], rpn[4], rpn[5]);
 153                 }
 154                 len = p - buf;
 155                 break;
 156         case WLAN_CIPHER_SUITE_AES_CMAC:
 157         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 158                 rpn = key->u.aes_cmac.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_GCMP:
 201         case WLAN_CIPHER_SUITE_GCMP_256:
 202                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
 203                 break;
 204         default:
 205                 return 0;
 206         }
 207         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 208 }
 209 KEY_OPS(replays);
 210
 211 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 212                                   size_t count, loff_t *ppos)
 213 {
 214         struct ieee80211_key *key = file->private_data;
 215         char buf[20];
 216         int len;
 217
 218         switch (key->conf.cipher) {
 219         case WLAN_CIPHER_SUITE_AES_CMAC:
 220         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 221                 len = scnprintf(buf, sizeof(buf), "%u\n",
 222                                 key->u.aes_cmac.icverrors);
 223                 break;
 224         default:
 225                 return 0;
 226         }
 227         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 228 }
 229 KEY_OPS(icverrors);
 230
 231 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
 232                                      size_t count, loff_t *ppos)
 233 {
 234         struct ieee80211_key *key = file->private_data;
 235         char buf[20];
 236         int len;
 237
 238         if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
 239                 return -EINVAL;
 240
 241         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
 242
 243         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 244 }
 245 KEY_OPS(mic_failures);
 246
 247 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 248                             size_t count, loff_t *ppos)
 249 {
 250         struct ieee80211_key *key = file->private_data;
 251         int i, bufsize = 2 * key->conf.keylen + 2;
 252         char *buf = kmalloc(bufsize, GFP_KERNEL);
 253         char *p = buf;
 254         ssize_t res;
 255
 256         if (!buf)
 257                 return -ENOMEM;
 258
 259         for (i = 0; i < key->conf.keylen; i++)
 260                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 261         p += scnprintf(p, bufsize+buf-p, "\n");
 262         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 263         kfree(buf);
 264         return res;
 265 }
 266 KEY_OPS(key);
 267
 268 #define DEBUGFS_ADD(name) \
 269         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 270                             key, &key_##name##_ops);
 271
 272 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 273 {
 274         static int keycount;
 275         char buf[100];
 276         struct sta_info *sta;
 277
 278         if (!key->local->debugfs.keys)
 279                 return;
 280
 281         sprintf(buf, "%d", keycount);
 282         key->debugfs.cnt = keycount;
 283         keycount++;
 284         key->debugfs.dir = debugfs_create_dir(buf,
 285                                         key->local->debugfs.keys);
 286
 287         if (!key->debugfs.dir)
 288                 return;
 289
 290         sta = key->sta;
 291         if (sta) {
 292                 sprintf(buf, "../../netdev:%s/stations/%pM",
 293                         sta->sdata->name, sta->sta.addr);
 294                 key->debugfs.stalink =
 295                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 296         }
 297
 298         DEBUGFS_ADD(keylen);
 299         DEBUGFS_ADD(flags);
 300         DEBUGFS_ADD(keyidx);
 301         DEBUGFS_ADD(hw_key_idx);
 302         DEBUGFS_ADD(tx_rx_count);
 303         DEBUGFS_ADD(algorithm);
 304         DEBUGFS_ADD(tx_spec);
 305         DEBUGFS_ADD(rx_spec);
 306         DEBUGFS_ADD(replays);
 307         DEBUGFS_ADD(icverrors);
 308         DEBUGFS_ADD(mic_failures);
 309         DEBUGFS_ADD(key);
 310         DEBUGFS_ADD(ifindex);
 311 };
 312
 313 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 314 {
 315         if (!key)
 316                 return;
 317
 318         debugfs_remove_recursive(key->debugfs.dir);
 319         key->debugfs.dir = NULL;
 320 }
 321
 322 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
 323 {
 324         char buf[50];
 325         struct ieee80211_key *key;
 326
 327         if (!sdata->vif.debugfs_dir)
 328                 return;
 329
 330         lockdep_assert_held(&sdata->local->key_mtx);
 331
 332         debugfs_remove(sdata->debugfs.default_unicast_key);
 333         sdata->debugfs.default_unicast_key = NULL;
 334
 335         if (sdata->default_unicast_key) {
 336                 key = key_mtx_dereference(sdata->local,
 337                                           sdata->default_unicast_key);
 338                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 339                 sdata->debugfs.default_unicast_key =
 340                         debugfs_create_symlink("default_unicast_key",
 341                                                sdata->vif.debugfs_dir, buf);
 342         }
 343
 344         debugfs_remove(sdata->debugfs.default_multicast_key);
 345         sdata->debugfs.default_multicast_key = NULL;
 346
 347         if (sdata->default_multicast_key) {
 348                 key = key_mtx_dereference(sdata->local,
 349                                           sdata->default_multicast_key);
 350                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 351                 sdata->debugfs.default_multicast_key =
 352                         debugfs_create_symlink("default_multicast_key",
 353                                                sdata->vif.debugfs_dir, buf);
 354         }
 355 }
 356
 357 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 358 {
 359         char buf[50];
 360         struct ieee80211_key *key;
 361
 362         if (!sdata->vif.debugfs_dir)
 363                 return;
 364
 365         key = key_mtx_dereference(sdata->local,
 366                                   sdata->default_mgmt_key);
 367         if (key) {
 368                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 369                 sdata->debugfs.default_mgmt_key =
 370                         debugfs_create_symlink("default_mgmt_key",
 371                                                sdata->vif.debugfs_dir, buf);
 372         } else
 373                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 374 }
 375
 376 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 377 {
 378         if (!sdata)
 379                 return;
 380
 381         debugfs_remove(sdata->debugfs.default_mgmt_key);
 382         sdata->debugfs.default_mgmt_key = NULL;
 383 }
 384
 385 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 386                                    struct sta_info *sta)
 387 {
 388         debugfs_remove(key->debugfs.stalink);
 389         key->debugfs.stalink = NULL;
 390 }