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         case WLAN_CIPHER_SUITE_AES_CMAC:
  99         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 100         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 101         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 102         case WLAN_CIPHER_SUITE_GCMP:
 103         case WLAN_CIPHER_SUITE_GCMP_256:
 104                 pn = atomic64_read(&key->conf.tx_pn);
 105                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 106                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
 107                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
 108                 break;
 109         default:
 110                 return 0;
 111         }
 112         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 113 }
 114 KEY_OPS(tx_spec);
 115
 116 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 117                                 size_t count, loff_t *ppos)
 118 {
 119         struct ieee80211_key *key = file->private_data;
 120         char buf[14*IEEE80211_NUM_TIDS+1], *p = buf;
 121         int i, len;
 122         const u8 *rpn;
 123
 124         switch (key->conf.cipher) {
 125         case WLAN_CIPHER_SUITE_WEP40:
 126         case WLAN_CIPHER_SUITE_WEP104:
 127                 len = scnprintf(buf, sizeof(buf), "\n");
 128                 break;
 129         case WLAN_CIPHER_SUITE_TKIP:
 130                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
 131                         p += scnprintf(p, sizeof(buf)+buf-p,
 132                                        "%08x %04x\n",
 133                                        key->u.tkip.rx[i].iv32,
 134                                        key->u.tkip.rx[i].iv16);
 135                 len = p - buf;
 136                 break;
 137         case WLAN_CIPHER_SUITE_CCMP:
 138         case WLAN_CIPHER_SUITE_CCMP_256:
 139                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 140                         rpn = key->u.ccmp.rx_pn[i];
 141                         p += scnprintf(p, sizeof(buf)+buf-p,
 142                                        "%02x%02x%02x%02x%02x%02x\n",
 143                                        rpn[0], rpn[1], rpn[2],
 144                                        rpn[3], rpn[4], rpn[5]);
 145                 }
 146                 len = p - buf;
 147                 break;
 148         case WLAN_CIPHER_SUITE_AES_CMAC:
 149         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 150                 rpn = key->u.aes_cmac.rx_pn;
 151                 p += scnprintf(p, sizeof(buf)+buf-p,
 152                                "%02x%02x%02x%02x%02x%02x\n",
 153                                rpn[0], rpn[1], rpn[2],
 154                                rpn[3], rpn[4], rpn[5]);
 155                 len = p - buf;
 156                 break;
 157         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 158         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 159                 rpn = key->u.aes_gmac.rx_pn;
 160                 p += scnprintf(p, sizeof(buf)+buf-p,
 161                                "%02x%02x%02x%02x%02x%02x\n",
 162                                rpn[0], rpn[1], rpn[2],
 163                                rpn[3], rpn[4], rpn[5]);
 164                 len = p - buf;
 165                 break;
 166         case WLAN_CIPHER_SUITE_GCMP:
 167         case WLAN_CIPHER_SUITE_GCMP_256:
 168                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
 169                         rpn = key->u.gcmp.rx_pn[i];
 170                         p += scnprintf(p, sizeof(buf)+buf-p,
 171                                        "%02x%02x%02x%02x%02x%02x\n",
 172                                        rpn[0], rpn[1], rpn[2],
 173                                        rpn[3], rpn[4], rpn[5]);
 174                 }
 175                 len = p - buf;
 176                 break;
 177         default:
 178                 return 0;
 179         }
 180         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 181 }
 182 KEY_OPS(rx_spec);
 183
 184 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 185                                 size_t count, loff_t *ppos)
 186 {
 187         struct ieee80211_key *key = file->private_data;
 188         char buf[20];
 189         int len;
 190
 191         switch (key->conf.cipher) {
 192         case WLAN_CIPHER_SUITE_CCMP:
 193         case WLAN_CIPHER_SUITE_CCMP_256:
 194                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 195                 break;
 196         case WLAN_CIPHER_SUITE_AES_CMAC:
 197         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 198                 len = scnprintf(buf, sizeof(buf), "%u\n",
 199                                 key->u.aes_cmac.replays);
 200                 break;
 201         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 202         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 203                 len = scnprintf(buf, sizeof(buf), "%u\n",
 204                                 key->u.aes_gmac.replays);
 205                 break;
 206         case WLAN_CIPHER_SUITE_GCMP:
 207         case WLAN_CIPHER_SUITE_GCMP_256:
 208                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays);
 209                 break;
 210         default:
 211                 return 0;
 212         }
 213         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 214 }
 215 KEY_OPS(replays);
 216
 217 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 218                                   size_t count, loff_t *ppos)
 219 {
 220         struct ieee80211_key *key = file->private_data;
 221         char buf[20];
 222         int len;
 223
 224         switch (key->conf.cipher) {
 225         case WLAN_CIPHER_SUITE_AES_CMAC:
 226         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 227                 len = scnprintf(buf, sizeof(buf), "%u\n",
 228                                 key->u.aes_cmac.icverrors);
 229                 break;
 230         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 231         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 232                 len = scnprintf(buf, sizeof(buf), "%u\n",
 233                                 key->u.aes_gmac.icverrors);
 234                 break;
 235         default:
 236                 return 0;
 237         }
 238         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 239 }
 240 KEY_OPS(icverrors);
 241
 242 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf,
 243                                      size_t count, loff_t *ppos)
 244 {
 245         struct ieee80211_key *key = file->private_data;
 246         char buf[20];
 247         int len;
 248
 249         if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP)
 250                 return -EINVAL;
 251
 252         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures);
 253
 254         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 255 }
 256 KEY_OPS(mic_failures);
 257
 258 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 259                             size_t count, loff_t *ppos)
 260 {
 261         struct ieee80211_key *key = file->private_data;
 262         int i, bufsize = 2 * key->conf.keylen + 2;
 263         char *buf = kmalloc(bufsize, GFP_KERNEL);
 264         char *p = buf;
 265         ssize_t res;
 266
 267         if (!buf)
 268                 return -ENOMEM;
 269
 270         for (i = 0; i < key->conf.keylen; i++)
 271                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 272         p += scnprintf(p, bufsize+buf-p, "\n");
 273         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 274         kfree(buf);
 275         return res;
 276 }
 277 KEY_OPS(key);
 278
 279 #define DEBUGFS_ADD(name) \
 280         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 281                             key, &key_##name##_ops);
 282
 283 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 284 {
 285         static int keycount;
 286         char buf[100];
 287         struct sta_info *sta;
 288
 289         if (!key->local->debugfs.keys)
 290                 return;
 291
 292         sprintf(buf, "%d", keycount);
 293         key->debugfs.cnt = keycount;
 294         keycount++;
 295         key->debugfs.dir = debugfs_create_dir(buf,
 296                                         key->local->debugfs.keys);
 297
 298         if (!key->debugfs.dir)
 299                 return;
 300
 301         sta = key->sta;
 302         if (sta) {
 303                 sprintf(buf, "../../netdev:%s/stations/%pM",
 304                         sta->sdata->name, sta->sta.addr);
 305                 key->debugfs.stalink =
 306                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 307         }
 308
 309         DEBUGFS_ADD(keylen);
 310         DEBUGFS_ADD(flags);
 311         DEBUGFS_ADD(keyidx);
 312         DEBUGFS_ADD(hw_key_idx);
 313         DEBUGFS_ADD(tx_rx_count);
 314         DEBUGFS_ADD(algorithm);
 315         DEBUGFS_ADD(tx_spec);
 316         DEBUGFS_ADD(rx_spec);
 317         DEBUGFS_ADD(replays);
 318         DEBUGFS_ADD(icverrors);
 319         DEBUGFS_ADD(mic_failures);
 320         DEBUGFS_ADD(key);
 321         DEBUGFS_ADD(ifindex);
 322 };
 323
 324 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 325 {
 326         if (!key)
 327                 return;
 328
 329         debugfs_remove_recursive(key->debugfs.dir);
 330         key->debugfs.dir = NULL;
 331 }
 332
 333 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
 334 {
 335         char buf[50];
 336         struct ieee80211_key *key;
 337
 338         if (!sdata->vif.debugfs_dir)
 339                 return;
 340
 341         lockdep_assert_held(&sdata->local->key_mtx);
 342
 343         debugfs_remove(sdata->debugfs.default_unicast_key);
 344         sdata->debugfs.default_unicast_key = NULL;
 345
 346         if (sdata->default_unicast_key) {
 347                 key = key_mtx_dereference(sdata->local,
 348                                           sdata->default_unicast_key);
 349                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 350                 sdata->debugfs.default_unicast_key =
 351                         debugfs_create_symlink("default_unicast_key",
 352                                                sdata->vif.debugfs_dir, buf);
 353         }
 354
 355         debugfs_remove(sdata->debugfs.default_multicast_key);
 356         sdata->debugfs.default_multicast_key = NULL;
 357
 358         if (sdata->default_multicast_key) {
 359                 key = key_mtx_dereference(sdata->local,
 360                                           sdata->default_multicast_key);
 361                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 362                 sdata->debugfs.default_multicast_key =
 363                         debugfs_create_symlink("default_multicast_key",
 364                                                sdata->vif.debugfs_dir, buf);
 365         }
 366 }
 367
 368 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 369 {
 370         char buf[50];
 371         struct ieee80211_key *key;
 372
 373         if (!sdata->vif.debugfs_dir)
 374                 return;
 375
 376         key = key_mtx_dereference(sdata->local,
 377                                   sdata->default_mgmt_key);
 378         if (key) {
 379                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 380                 sdata->debugfs.default_mgmt_key =
 381                         debugfs_create_symlink("default_mgmt_key",
 382                                                sdata->vif.debugfs_dir, buf);
 383         } else
 384                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 385 }
 386
 387 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 388 {
 389         if (!sdata)
 390                 return;
 391
 392         debugfs_remove(sdata->debugfs.default_mgmt_key);
 393         sdata->debugfs.default_mgmt_key = NULL;
 394 }
 395
 396 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 397                                    struct sta_info *sta)
 398 {
 399         debugfs_remove(key->debugfs.stalink);
 400         key->debugfs.stalink = NULL;
 401 }