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 = mac80211_open_file_generic,                             \
  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 = mac80211_open_file_generic,                             \
  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         const u8 *tpn;
  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                 tpn = key->u.ccmp.tx_pn;
  98                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
  99                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
 100                 break;
 101         case WLAN_CIPHER_SUITE_AES_CMAC:
 102                 tpn = key->u.aes_cmac.tx_pn;
 103                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 104                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4],
 105                                 tpn[5]);
 106                 break;
 107         default:
 108                 return 0;
 109         }
 110         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 111 }
 112 KEY_OPS(tx_spec);
 113
 114 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 115                                 size_t count, loff_t *ppos)
 116 {
 117         struct ieee80211_key *key = file->private_data;
 118         char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
 119         int i, len;
 120         const u8 *rpn;
 121
 122         switch (key->conf.cipher) {
 123         case WLAN_CIPHER_SUITE_WEP40:
 124         case WLAN_CIPHER_SUITE_WEP104:
 125                 len = scnprintf(buf, sizeof(buf), "\n");
 126                 break;
 127         case WLAN_CIPHER_SUITE_TKIP:
 128                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 129                         p += scnprintf(p, sizeof(buf)+buf-p,
 130                                        "%08x %04x\n",
 131                                        key->u.tkip.rx[i].iv32,
 132                                        key->u.tkip.rx[i].iv16);
 133                 len = p - buf;
 134                 break;
 135         case WLAN_CIPHER_SUITE_CCMP:
 136                 for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) {
 137                         rpn = key->u.ccmp.rx_pn[i];
 138                         p += scnprintf(p, sizeof(buf)+buf-p,
 139                                        "%02x%02x%02x%02x%02x%02x\n",
 140                                        rpn[0], rpn[1], rpn[2],
 141                                        rpn[3], rpn[4], rpn[5]);
 142                 }
 143                 len = p - buf;
 144                 break;
 145         case WLAN_CIPHER_SUITE_AES_CMAC:
 146                 rpn = key->u.aes_cmac.rx_pn;
 147                 p += scnprintf(p, sizeof(buf)+buf-p,
 148                                "%02x%02x%02x%02x%02x%02x\n",
 149                                rpn[0], rpn[1], rpn[2],
 150                                rpn[3], rpn[4], rpn[5]);
 151                 len = p - buf;
 152                 break;
 153         default:
 154                 return 0;
 155         }
 156         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 157 }
 158 KEY_OPS(rx_spec);
 159
 160 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 161                                 size_t count, loff_t *ppos)
 162 {
 163         struct ieee80211_key *key = file->private_data;
 164         char buf[20];
 165         int len;
 166
 167         switch (key->conf.cipher) {
 168         case WLAN_CIPHER_SUITE_CCMP:
 169                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 170                 break;
 171         case WLAN_CIPHER_SUITE_AES_CMAC:
 172                 len = scnprintf(buf, sizeof(buf), "%u\n",
 173                                 key->u.aes_cmac.replays);
 174                 break;
 175         default:
 176                 return 0;
 177         }
 178         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 179 }
 180 KEY_OPS(replays);
 181
 182 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 183                                   size_t count, loff_t *ppos)
 184 {
 185         struct ieee80211_key *key = file->private_data;
 186         char buf[20];
 187         int len;
 188
 189         switch (key->conf.cipher) {
 190         case WLAN_CIPHER_SUITE_AES_CMAC:
 191                 len = scnprintf(buf, sizeof(buf), "%u\n",
 192                                 key->u.aes_cmac.icverrors);
 193                 break;
 194         default:
 195                 return 0;
 196         }
 197         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 198 }
 199 KEY_OPS(icverrors);
 200
 201 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 202                             size_t count, loff_t *ppos)
 203 {
 204         struct ieee80211_key *key = file->private_data;
 205         int i, bufsize = 2 * key->conf.keylen + 2;
 206         char *buf = kmalloc(bufsize, GFP_KERNEL);
 207         char *p = buf;
 208         ssize_t res;
 209
 210         if (!buf)
 211                 return -ENOMEM;
 212
 213         for (i = 0; i < key->conf.keylen; i++)
 214                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 215         p += scnprintf(p, bufsize+buf-p, "\n");
 216         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 217         kfree(buf);
 218         return res;
 219 }
 220 KEY_OPS(key);
 221
 222 #define DEBUGFS_ADD(name) \
 223         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 224                             key, &key_##name##_ops);
 225
 226 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 227   {
 228         static int keycount;
 229         char buf[50];
 230         struct sta_info *sta;
 231
 232         if (!key->local->debugfs.keys)
 233                 return;
 234
 235         sprintf(buf, "%d", keycount);
 236         key->debugfs.cnt = keycount;
 237         keycount++;
 238         key->debugfs.dir = debugfs_create_dir(buf,
 239                                         key->local->debugfs.keys);
 240
 241         if (!key->debugfs.dir)
 242                 return;
 243
 244         rcu_read_lock();
 245         sta = rcu_dereference(key->sta);
 246         if (sta)
 247                 sprintf(buf, "../../stations/%pM", sta->sta.addr);
 248         rcu_read_unlock();
 249
 250         /* using sta as a boolean is fine outside RCU lock */
 251         if (sta)
 252                 key->debugfs.stalink =
 253                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 254
 255         DEBUGFS_ADD(keylen);
 256         DEBUGFS_ADD(flags);
 257         DEBUGFS_ADD(keyidx);
 258         DEBUGFS_ADD(hw_key_idx);
 259         DEBUGFS_ADD(tx_rx_count);
 260         DEBUGFS_ADD(algorithm);
 261         DEBUGFS_ADD(tx_spec);
 262         DEBUGFS_ADD(rx_spec);
 263         DEBUGFS_ADD(replays);
 264         DEBUGFS_ADD(icverrors);
 265         DEBUGFS_ADD(key);
 266         DEBUGFS_ADD(ifindex);
 267 };
 268
 269 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 270 {
 271         if (!key)
 272                 return;
 273
 274         debugfs_remove_recursive(key->debugfs.dir);
 275         key->debugfs.dir = NULL;
 276 }
 277
 278 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata)
 279 {
 280         char buf[50];
 281         struct ieee80211_key *key;
 282
 283         if (!sdata->debugfs.dir)
 284                 return;
 285
 286         lockdep_assert_held(&sdata->local->key_mtx);
 287
 288         if (sdata->default_unicast_key) {
 289                 key = sdata->default_unicast_key;
 290                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 291                 sdata->debugfs.default_unicast_key =
 292                         debugfs_create_symlink("default_unicast_key",
 293                                                sdata->debugfs.dir, buf);
 294         } else {
 295                 debugfs_remove(sdata->debugfs.default_unicast_key);
 296                 sdata->debugfs.default_unicast_key = NULL;
 297         }
 298
 299         if (sdata->default_multicast_key) {
 300                 key = sdata->default_multicast_key;
 301                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 302                 sdata->debugfs.default_multicast_key =
 303                         debugfs_create_symlink("default_multicast_key",
 304                                                sdata->debugfs.dir, buf);
 305         } else {
 306                 debugfs_remove(sdata->debugfs.default_multicast_key);
 307                 sdata->debugfs.default_multicast_key = NULL;
 308         }
 309 }
 310
 311 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 312 {
 313         char buf[50];
 314         struct ieee80211_key *key;
 315
 316         if (!sdata->debugfs.dir)
 317                 return;
 318
 319         /* this is running under the key lock */
 320
 321         key = sdata->default_mgmt_key;
 322         if (key) {
 323                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 324                 sdata->debugfs.default_mgmt_key =
 325                         debugfs_create_symlink("default_mgmt_key",
 326                                                sdata->debugfs.dir, buf);
 327         } else
 328                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 329 }
 330
 331 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 332 {
 333         if (!sdata)
 334                 return;
 335
 336         debugfs_remove(sdata->debugfs.default_mgmt_key);
 337         sdata->debugfs.default_mgmt_key = NULL;
 338 }
 339
 340 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 341                                    struct sta_info *sta)
 342 {
 343         debugfs_remove(key->debugfs.stalink);
 344         key->debugfs.stalink = NULL;
 345 }