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 "ieee80211_i.h"
  13 #include "key.h"
  14 #include "debugfs.h"
  15 #include "debugfs_key.h"
  16
  17 #define KEY_READ(name, prop, buflen, format_string)                     \
  18 static ssize_t key_##name##_read(struct file *file,                     \
  19                                  char __user *userbuf,                  \
  20                                  size_t count, loff_t *ppos)            \
  21 {                                                                       \
  22         char buf[buflen];                                               \
  23         struct ieee80211_key *key = file->private_data;                 \
  24         int res = scnprintf(buf, buflen, format_string, key->prop);     \
  25         return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
  26 }
  27 #define KEY_READ_D(name) KEY_READ(name, name, 20, "%d\n")
  28 #define KEY_READ_X(name) KEY_READ(name, name, 20, "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 }
  35
  36 #define KEY_FILE(name, format)                                          \
  37                  KEY_READ_##format(name)                                \
  38                  KEY_OPS(name)
  39
  40 #define KEY_CONF_READ(name, buflen, format_string)                      \
  41         KEY_READ(conf_##name, conf.name, buflen, format_string)
  42 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, 20, "%d\n")
  43
  44 #define KEY_CONF_OPS(name)                                              \
  45 static const struct file_operations key_ ##name## _ops = {              \
  46         .read = key_conf_##name##_read,                                 \
  47         .open = mac80211_open_file_generic,                             \
  48 }
  49
  50 #define KEY_CONF_FILE(name, format)                                     \
  51                  KEY_CONF_READ_##format(name)                           \
  52                  KEY_CONF_OPS(name)
  53
  54 KEY_CONF_FILE(keylen, D);
  55 KEY_CONF_FILE(keyidx, D);
  56 KEY_CONF_FILE(hw_key_idx, D);
  57 KEY_FILE(flags, X);
  58 KEY_FILE(tx_rx_count, D);
  59 KEY_READ(ifindex, sdata->name, IFNAMSIZ + 2, "%s\n");
  60 KEY_OPS(ifindex);
  61
  62 static ssize_t key_algorithm_read(struct file *file,
  63                                   char __user *userbuf,
  64                                   size_t count, loff_t *ppos)
  65 {
  66         char *alg;
  67         struct ieee80211_key *key = file->private_data;
  68
  69         switch (key->conf.alg) {
  70         case ALG_WEP:
  71                 alg = "WEP\n";
  72                 break;
  73         case ALG_TKIP:
  74                 alg = "TKIP\n";
  75                 break;
  76         case ALG_CCMP:
  77                 alg = "CCMP\n";
  78                 break;
  79         case ALG_AES_CMAC:
  80                 alg = "AES-128-CMAC\n";
  81                 break;
  82         default:
  83                 return 0;
  84         }
  85         return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
  86 }
  87 KEY_OPS(algorithm);
  88
  89 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  90                                 size_t count, loff_t *ppos)
  91 {
  92         const u8 *tpn;
  93         char buf[20];
  94         int len;
  95         struct ieee80211_key *key = file->private_data;
  96
  97         switch (key->conf.alg) {
  98         case ALG_WEP:
  99                 len = scnprintf(buf, sizeof(buf), "\n");
 100                 break;
 101         case ALG_TKIP:
 102                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
 103                                 key->u.tkip.tx.iv32,
 104                                 key->u.tkip.tx.iv16);
 105                 break;
 106         case ALG_CCMP:
 107                 tpn = key->u.ccmp.tx_pn;
 108                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 109                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
 110                 break;
 111         case ALG_AES_CMAC:
 112                 tpn = key->u.aes_cmac.tx_pn;
 113                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 114                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4],
 115                                 tpn[5]);
 116                 break;
 117         default:
 118                 return 0;
 119         }
 120         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 121 }
 122 KEY_OPS(tx_spec);
 123
 124 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 125                                 size_t count, loff_t *ppos)
 126 {
 127         struct ieee80211_key *key = file->private_data;
 128         char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
 129         int i, len;
 130         const u8 *rpn;
 131
 132         switch (key->conf.alg) {
 133         case ALG_WEP:
 134                 len = scnprintf(buf, sizeof(buf), "\n");
 135                 break;
 136         case ALG_TKIP:
 137                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 138                         p += scnprintf(p, sizeof(buf)+buf-p,
 139                                        "%08x %04x\n",
 140                                        key->u.tkip.rx[i].iv32,
 141                                        key->u.tkip.rx[i].iv16);
 142                 len = p - buf;
 143                 break;
 144         case ALG_CCMP:
 145                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
 146                         rpn = key->u.ccmp.rx_pn[i];
 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                 }
 152                 len = p - buf;
 153                 break;
 154         case ALG_AES_CMAC:
 155                 rpn = key->u.aes_cmac.rx_pn;
 156                 p += scnprintf(p, sizeof(buf)+buf-p,
 157                                "%02x%02x%02x%02x%02x%02x\n",
 158                                rpn[0], rpn[1], rpn[2],
 159                                rpn[3], rpn[4], rpn[5]);
 160                 len = p - buf;
 161                 break;
 162         default:
 163                 return 0;
 164         }
 165         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 166 }
 167 KEY_OPS(rx_spec);
 168
 169 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 170                                 size_t count, loff_t *ppos)
 171 {
 172         struct ieee80211_key *key = file->private_data;
 173         char buf[20];
 174         int len;
 175
 176         switch (key->conf.alg) {
 177         case ALG_CCMP:
 178                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 179                 break;
 180         case ALG_AES_CMAC:
 181                 len = scnprintf(buf, sizeof(buf), "%u\n",
 182                                 key->u.aes_cmac.replays);
 183                 break;
 184         default:
 185                 return 0;
 186         }
 187         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 188 }
 189 KEY_OPS(replays);
 190
 191 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 192                                   size_t count, loff_t *ppos)
 193 {
 194         struct ieee80211_key *key = file->private_data;
 195         char buf[20];
 196         int len;
 197
 198         switch (key->conf.alg) {
 199         case ALG_AES_CMAC:
 200                 len = scnprintf(buf, sizeof(buf), "%u\n",
 201                                 key->u.aes_cmac.icverrors);
 202                 break;
 203         default:
 204                 return 0;
 205         }
 206         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 207 }
 208 KEY_OPS(icverrors);
 209
 210 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 211                             size_t count, loff_t *ppos)
 212 {
 213         struct ieee80211_key *key = file->private_data;
 214         int i, res, bufsize = 2 * key->conf.keylen + 2;
 215         char *buf = kmalloc(bufsize, GFP_KERNEL);
 216         char *p = buf;
 217
 218         for (i = 0; i < key->conf.keylen; i++)
 219                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 220         p += scnprintf(p, bufsize+buf-p, "\n");
 221         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 222         kfree(buf);
 223         return res;
 224 }
 225 KEY_OPS(key);
 226
 227 #define DEBUGFS_ADD(name) \
 228         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 229                             key, &key_##name##_ops);
 230
 231 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 232   {
 233         static int keycount;
 234         char buf[50];
 235         struct sta_info *sta;
 236
 237         if (!key->local->debugfs.keys)
 238                 return;
 239
 240         sprintf(buf, "%d", keycount);
 241         key->debugfs.cnt = keycount;
 242         keycount++;
 243         key->debugfs.dir = debugfs_create_dir(buf,
 244                                         key->local->debugfs.keys);
 245
 246         if (!key->debugfs.dir)
 247                 return;
 248
 249         rcu_read_lock();
 250         sta = rcu_dereference(key->sta);
 251         if (sta)
 252                 sprintf(buf, "../../stations/%pM", sta->sta.addr);
 253         rcu_read_unlock();
 254
 255         /* using sta as a boolean is fine outside RCU lock */
 256         if (sta)
 257                 key->debugfs.stalink =
 258                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 259
 260         DEBUGFS_ADD(keylen);
 261         DEBUGFS_ADD(flags);
 262         DEBUGFS_ADD(keyidx);
 263         DEBUGFS_ADD(hw_key_idx);
 264         DEBUGFS_ADD(tx_rx_count);
 265         DEBUGFS_ADD(algorithm);
 266         DEBUGFS_ADD(tx_spec);
 267         DEBUGFS_ADD(rx_spec);
 268         DEBUGFS_ADD(replays);
 269         DEBUGFS_ADD(icverrors);
 270         DEBUGFS_ADD(key);
 271         DEBUGFS_ADD(ifindex);
 272 };
 273
 274 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 275 {
 276         if (!key)
 277                 return;
 278
 279         debugfs_remove_recursive(key->debugfs.dir);
 280         key->debugfs.dir = NULL;
 281 }
 282 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 283 {
 284         char buf[50];
 285         struct ieee80211_key *key;
 286
 287         if (!sdata->debugfs.dir)
 288                 return;
 289
 290         /* this is running under the key lock */
 291
 292         key = sdata->default_key;
 293         if (key) {
 294                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 295                 sdata->debugfs.default_key =
 296                         debugfs_create_symlink("default_key",
 297                                                sdata->debugfs.dir, buf);
 298         } else
 299                 ieee80211_debugfs_key_remove_default(sdata);
 300 }
 301
 302 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 303 {
 304         if (!sdata)
 305                 return;
 306
 307         debugfs_remove(sdata->debugfs.default_key);
 308         sdata->debugfs.default_key = NULL;
 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 }