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