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         .llseek = generic_file_llseek,                                  \
  36 }
  37
  38 #define KEY_FILE(name, format)                                          \
  39                  KEY_READ_##format(name)                                \
  40                  KEY_OPS(name)
  41
  42 #define KEY_CONF_READ(name, buflen, format_string)                      \
  43         KEY_READ(conf_##name, conf.name, buflen, format_string)
  44 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, 20, "%d\n")
  45
  46 #define KEY_CONF_OPS(name)                                              \
  47 static const struct file_operations key_ ##name## _ops = {              \
  48         .read = key_conf_##name##_read,                                 \
  49         .open = mac80211_open_file_generic,                             \
  50         .llseek = generic_file_llseek,                                  \
  51 }
  52
  53 #define KEY_CONF_FILE(name, format)                                     \
  54                  KEY_CONF_READ_##format(name)                           \
  55                  KEY_CONF_OPS(name)
  56
  57 KEY_CONF_FILE(keylen, D);
  58 KEY_CONF_FILE(keyidx, D);
  59 KEY_CONF_FILE(hw_key_idx, D);
  60 KEY_FILE(flags, X);
  61 KEY_FILE(tx_rx_count, D);
  62 KEY_READ(ifindex, sdata->name, IFNAMSIZ + 2, "%s\n");
  63 KEY_OPS(ifindex);
  64
  65 static ssize_t key_algorithm_read(struct file *file,
  66                                   char __user *userbuf,
  67                                   size_t count, loff_t *ppos)
  68 {
  69         char buf[15];
  70         struct ieee80211_key *key = file->private_data;
  71         u32 c = key->conf.cipher;
  72
  73         sprintf(buf, "%.2x-%.2x-%.2x:%d\n",
  74                 c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff);
  75         return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
  76 }
  77 KEY_OPS(algorithm);
  78
  79 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  80                                 size_t count, loff_t *ppos)
  81 {
  82         const u8 *tpn;
  83         char buf[20];
  84         int len;
  85         struct ieee80211_key *key = file->private_data;
  86
  87         switch (key->conf.cipher) {
  88         case WLAN_CIPHER_SUITE_WEP40:
  89         case WLAN_CIPHER_SUITE_WEP104:
  90                 len = scnprintf(buf, sizeof(buf), "\n");
  91                 break;
  92         case WLAN_CIPHER_SUITE_TKIP:
  93                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
  94                                 key->u.tkip.tx.iv32,
  95                                 key->u.tkip.tx.iv16);
  96                 break;
  97         case WLAN_CIPHER_SUITE_CCMP:
  98                 tpn = key->u.ccmp.tx_pn;
  99                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 100                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
 101                 break;
 102         case WLAN_CIPHER_SUITE_AES_CMAC:
 103                 tpn = key->u.aes_cmac.tx_pn;
 104                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 105                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4],
 106                                 tpn[5]);
 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*NUM_RX_DATA_QUEUES+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 < NUM_RX_DATA_QUEUES; 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 < NUM_RX_DATA_QUEUES + 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_key_read(struct file *file, char __user *userbuf,
 203                             size_t count, loff_t *ppos)
 204 {
 205         struct ieee80211_key *key = file->private_data;
 206         int i, res, bufsize = 2 * key->conf.keylen + 2;
 207         char *buf = kmalloc(bufsize, GFP_KERNEL);
 208         char *p = buf;
 209
 210         for (i = 0; i < key->conf.keylen; i++)
 211                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 212         p += scnprintf(p, bufsize+buf-p, "\n");
 213         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 214         kfree(buf);
 215         return res;
 216 }
 217 KEY_OPS(key);
 218
 219 #define DEBUGFS_ADD(name) \
 220         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 221                             key, &key_##name##_ops);
 222
 223 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 224   {
 225         static int keycount;
 226         char buf[50];
 227         struct sta_info *sta;
 228
 229         if (!key->local->debugfs.keys)
 230                 return;
 231
 232         sprintf(buf, "%d", keycount);
 233         key->debugfs.cnt = keycount;
 234         keycount++;
 235         key->debugfs.dir = debugfs_create_dir(buf,
 236                                         key->local->debugfs.keys);
 237
 238         if (!key->debugfs.dir)
 239                 return;
 240
 241         rcu_read_lock();
 242         sta = rcu_dereference(key->sta);
 243         if (sta)
 244                 sprintf(buf, "../../stations/%pM", sta->sta.addr);
 245         rcu_read_unlock();
 246
 247         /* using sta as a boolean is fine outside RCU lock */
 248         if (sta)
 249                 key->debugfs.stalink =
 250                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 251
 252         DEBUGFS_ADD(keylen);
 253         DEBUGFS_ADD(flags);
 254         DEBUGFS_ADD(keyidx);
 255         DEBUGFS_ADD(hw_key_idx);
 256         DEBUGFS_ADD(tx_rx_count);
 257         DEBUGFS_ADD(algorithm);
 258         DEBUGFS_ADD(tx_spec);
 259         DEBUGFS_ADD(rx_spec);
 260         DEBUGFS_ADD(replays);
 261         DEBUGFS_ADD(icverrors);
 262         DEBUGFS_ADD(key);
 263         DEBUGFS_ADD(ifindex);
 264 };
 265
 266 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 267 {
 268         if (!key)
 269                 return;
 270
 271         debugfs_remove_recursive(key->debugfs.dir);
 272         key->debugfs.dir = NULL;
 273 }
 274 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 275 {
 276         char buf[50];
 277         struct ieee80211_key *key;
 278
 279         if (!sdata->debugfs.dir)
 280                 return;
 281
 282         /* this is running under the key lock */
 283
 284         key = sdata->default_key;
 285         if (key) {
 286                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 287                 sdata->debugfs.default_key =
 288                         debugfs_create_symlink("default_key",
 289                                                sdata->debugfs.dir, buf);
 290         } else
 291                 ieee80211_debugfs_key_remove_default(sdata);
 292 }
 293
 294 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 295 {
 296         if (!sdata)
 297                 return;
 298
 299         debugfs_remove(sdata->debugfs.default_key);
 300         sdata->debugfs.default_key = NULL;
 301 }
 302
 303 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 304 {
 305         char buf[50];
 306         struct ieee80211_key *key;
 307
 308         if (!sdata->debugfs.dir)
 309                 return;
 310
 311         /* this is running under the key lock */
 312
 313         key = sdata->default_mgmt_key;
 314         if (key) {
 315                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 316                 sdata->debugfs.default_mgmt_key =
 317                         debugfs_create_symlink("default_mgmt_key",
 318                                                sdata->debugfs.dir, buf);
 319         } else
 320                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 321 }
 322
 323 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 324 {
 325         if (!sdata)
 326                 return;
 327
 328         debugfs_remove(sdata->debugfs.default_mgmt_key);
 329         sdata->debugfs.default_mgmt_key = NULL;
 330 }
 331
 332 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 333                                    struct sta_info *sta)
 334 {
 335         debugfs_remove(key->debugfs.stalink);
 336         key->debugfs.stalink = NULL;
 337 }