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, buflen, 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         char buf[buflen];                                               \
  24         struct ieee80211_key *key = file->private_data;                 \
  25         int res = scnprintf(buf, buflen, format_string, key->prop);     \
  26         return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
  27 }
  28 #define KEY_READ_D(name) KEY_READ(name, name, 20, "%d\n")
  29 #define KEY_READ_X(name) KEY_READ(name, name, 20, "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 = mac80211_open_file_generic,                             \
  35 }
  36
  37 #define KEY_FILE(name, format)                                          \
  38                  KEY_READ_##format(name)                                \
  39                  KEY_OPS(name)
  40
  41 #define KEY_CONF_READ(name, buflen, format_string)                      \
  42         KEY_READ(conf_##name, conf.name, buflen, format_string)
  43 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, 20, "%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 = mac80211_open_file_generic,                             \
  49 }
  50
  51 #define KEY_CONF_FILE(name, format)                                     \
  52                  KEY_CONF_READ_##format(name)                           \
  53                  KEY_CONF_OPS(name)
  54
  55 KEY_CONF_FILE(keylen, D);
  56 KEY_CONF_FILE(keyidx, D);
  57 KEY_CONF_FILE(hw_key_idx, D);
  58 KEY_FILE(flags, X);
  59 KEY_FILE(tx_rx_count, D);
  60 KEY_READ(ifindex, sdata->name, IFNAMSIZ + 2, "%s\n");
  61 KEY_OPS(ifindex);
  62
  63 static ssize_t key_algorithm_read(struct file *file,
  64                                   char __user *userbuf,
  65                                   size_t count, loff_t *ppos)
  66 {
  67         char buf[15];
  68         struct ieee80211_key *key = file->private_data;
  69         u32 c = key->conf.cipher;
  70
  71         sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
  72                 c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
  73         return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
  74 }
  75 KEY_OPS(algorithm);
  76
  77 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  78                                 size_t count, loff_t *ppos)
  79 {
  80         const u8 *tpn;
  81         char buf[20];
  82         int len;
  83         struct ieee80211_key *key = file->private_data;
  84
  85         switch (key->conf.cipher) {
  86         case WLAN_CIPHER_SUITE_WEP40:
  87         case WLAN_CIPHER_SUITE_WEP104:
  88                 len = scnprintf(buf, sizeof(buf), "\n");
  89                 break;
  90         case WLAN_CIPHER_SUITE_TKIP:
  91                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
  92                                 key->u.tkip.tx.iv32,
  93                                 key->u.tkip.tx.iv16);
  94                 break;
  95         case WLAN_CIPHER_SUITE_CCMP:
  96                 tpn = key->u.ccmp.tx_pn;
  97                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
  98                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
  99                 break;
 100         case WLAN_CIPHER_SUITE_AES_CMAC:
 101                 tpn = key->u.aes_cmac.tx_pn;
 102                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 103                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4],
 104                                 tpn[5]);
 105                 break;
 106         default:
 107                 return 0;
 108         }
 109         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 110 }
 111 KEY_OPS(tx_spec);
 112
 113 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 114                                 size_t count, loff_t *ppos)
 115 {
 116         struct ieee80211_key *key = file->private_data;
 117         char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
 118         int i, len;
 119         const u8 *rpn;
 120
 121         switch (key->conf.cipher) {
 122         case WLAN_CIPHER_SUITE_WEP40:
 123         case WLAN_CIPHER_SUITE_WEP104:
 124                 len = scnprintf(buf, sizeof(buf), "\n");
 125                 break;
 126         case WLAN_CIPHER_SUITE_TKIP:
 127                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 128                         p += scnprintf(p, sizeof(buf)+buf-p,
 129                                        "%08x %04x\n",
 130                                        key->u.tkip.rx[i].iv32,
 131                                        key->u.tkip.rx[i].iv16);
 132                 len = p - buf;
 133                 break;
 134         case WLAN_CIPHER_SUITE_CCMP:
 135                 for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) {
 136                         rpn = key->u.ccmp.rx_pn[i];
 137                         p += scnprintf(p, sizeof(buf)+buf-p,
 138                                        "%02x%02x%02x%02x%02x%02x\n",
 139                                        rpn[0], rpn[1], rpn[2],
 140                                        rpn[3], rpn[4], rpn[5]);
 141                 }
 142                 len = p - buf;
 143                 break;
 144         case WLAN_CIPHER_SUITE_AES_CMAC:
 145                 rpn = key->u.aes_cmac.rx_pn;
 146                 p += scnprintf(p, sizeof(buf)+buf-p,
 147                                "%02x%02x%02x%02x%02x%02x\n",
 148                                rpn[0], rpn[1], rpn[2],
 149                                rpn[3], rpn[4], rpn[5]);
 150                 len = p - buf;
 151                 break;
 152         default:
 153                 return 0;
 154         }
 155         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 156 }
 157 KEY_OPS(rx_spec);
 158
 159 static ssize_t key_replays_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[20];
 164         int len;
 165
 166         switch (key->conf.cipher) {
 167         case WLAN_CIPHER_SUITE_CCMP:
 168                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 169                 break;
 170         case WLAN_CIPHER_SUITE_AES_CMAC:
 171                 len = scnprintf(buf, sizeof(buf), "%u\n",
 172                                 key->u.aes_cmac.replays);
 173                 break;
 174         default:
 175                 return 0;
 176         }
 177         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 178 }
 179 KEY_OPS(replays);
 180
 181 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 182                                   size_t count, loff_t *ppos)
 183 {
 184         struct ieee80211_key *key = file->private_data;
 185         char buf[20];
 186         int len;
 187
 188         switch (key->conf.cipher) {
 189         case WLAN_CIPHER_SUITE_AES_CMAC:
 190                 len = scnprintf(buf, sizeof(buf), "%u\n",
 191                                 key->u.aes_cmac.icverrors);
 192                 break;
 193         default:
 194                 return 0;
 195         }
 196         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 197 }
 198 KEY_OPS(icverrors);
 199
 200 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 201                             size_t count, loff_t *ppos)
 202 {
 203         struct ieee80211_key *key = file->private_data;
 204         int i, res, bufsize = 2 * key->conf.keylen + 2;
 205         char *buf = kmalloc(bufsize, GFP_KERNEL);
 206         char *p = buf;
 207
 208         for (i = 0; i < key->conf.keylen; i++)
 209                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 210         p += scnprintf(p, bufsize+buf-p, "\n");
 211         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 212         kfree(buf);
 213         return res;
 214 }
 215 KEY_OPS(key);
 216
 217 #define DEBUGFS_ADD(name) \
 218         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 219                             key, &key_##name##_ops);
 220
 221 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 222   {
 223         static int keycount;
 224         char buf[50];
 225         struct sta_info *sta;
 226
 227         if (!key->local->debugfs.keys)
 228                 return;
 229
 230         sprintf(buf, "%d", keycount);
 231         key->debugfs.cnt = keycount;
 232         keycount++;
 233         key->debugfs.dir = debugfs_create_dir(buf,
 234                                         key->local->debugfs.keys);
 235
 236         if (!key->debugfs.dir)
 237                 return;
 238
 239         rcu_read_lock();
 240         sta = rcu_dereference(key->sta);
 241         if (sta)
 242                 sprintf(buf, "../../stations/%pM", sta->sta.addr);
 243         rcu_read_unlock();
 244
 245         /* using sta as a boolean is fine outside RCU lock */
 246         if (sta)
 247                 key->debugfs.stalink =
 248                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 249
 250         DEBUGFS_ADD(keylen);
 251         DEBUGFS_ADD(flags);
 252         DEBUGFS_ADD(keyidx);
 253         DEBUGFS_ADD(hw_key_idx);
 254         DEBUGFS_ADD(tx_rx_count);
 255         DEBUGFS_ADD(algorithm);
 256         DEBUGFS_ADD(tx_spec);
 257         DEBUGFS_ADD(rx_spec);
 258         DEBUGFS_ADD(replays);
 259         DEBUGFS_ADD(icverrors);
 260         DEBUGFS_ADD(key);
 261         DEBUGFS_ADD(ifindex);
 262 };
 263
 264 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 265 {
 266         if (!key)
 267                 return;
 268
 269         debugfs_remove_recursive(key->debugfs.dir);
 270         key->debugfs.dir = NULL;
 271 }
 272 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 273 {
 274         char buf[50];
 275         struct ieee80211_key *key;
 276
 277         if (!sdata->debugfs.dir)
 278                 return;
 279
 280         /* this is running under the key lock */
 281
 282         key = sdata->default_key;
 283         if (key) {
 284                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 285                 sdata->debugfs.default_key =
 286                         debugfs_create_symlink("default_key",
 287                                                sdata->debugfs.dir, buf);
 288         } else
 289                 ieee80211_debugfs_key_remove_default(sdata);
 290 }
 291
 292 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 293 {
 294         if (!sdata)
 295                 return;
 296
 297         debugfs_remove(sdata->debugfs.default_key);
 298         sdata->debugfs.default_key = NULL;
 299 }
 300
 301 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 302 {
 303         char buf[50];
 304         struct ieee80211_key *key;
 305
 306         if (!sdata->debugfs.dir)
 307                 return;
 308
 309         /* this is running under the key lock */
 310
 311         key = sdata->default_mgmt_key;
 312         if (key) {
 313                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 314                 sdata->debugfs.default_mgmt_key =
 315                         debugfs_create_symlink("default_mgmt_key",
 316                                                sdata->debugfs.dir, buf);
 317         } else
 318                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 319 }
 320
 321 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 322 {
 323         if (!sdata)
 324                 return;
 325
 326         debugfs_remove(sdata->debugfs.default_mgmt_key);
 327         sdata->debugfs.default_mgmt_key = NULL;
 328 }
 329
 330 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 331                                    struct sta_info *sta)
 332 {
 333         debugfs_remove(key->debugfs.stalink);
 334         key->debugfs.stalink = NULL;
 335 }