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 *alg;
  70         struct ieee80211_key *key = file->private_data;
  71
  72         switch (key->conf.alg) {
  73         case ALG_WEP:
  74                 alg = "WEP\n";
  75                 break;
  76         case ALG_TKIP:
  77                 alg = "TKIP\n";
  78                 break;
  79         case ALG_CCMP:
  80                 alg = "CCMP\n";
  81                 break;
  82         case ALG_AES_CMAC:
  83                 alg = "AES-128-CMAC\n";
  84                 break;
  85         default:
  86                 return 0;
  87         }
  88         return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
  89 }
  90 KEY_OPS(algorithm);
  91
  92 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  93                                 size_t count, loff_t *ppos)
  94 {
  95         const u8 *tpn;
  96         char buf[20];
  97         int len;
  98         struct ieee80211_key *key = file->private_data;
  99
 100         switch (key->conf.alg) {
 101         case ALG_WEP:
 102                 len = scnprintf(buf, sizeof(buf), "\n");
 103                 break;
 104         case ALG_TKIP:
 105                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
 106                                 key->u.tkip.tx.iv32,
 107                                 key->u.tkip.tx.iv16);
 108                 break;
 109         case ALG_CCMP:
 110                 tpn = key->u.ccmp.tx_pn;
 111                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 112                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
 113                 break;
 114         case ALG_AES_CMAC:
 115                 tpn = key->u.aes_cmac.tx_pn;
 116                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 117                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4],
 118                                 tpn[5]);
 119                 break;
 120         default:
 121                 return 0;
 122         }
 123         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 124 }
 125 KEY_OPS(tx_spec);
 126
 127 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 128                                 size_t count, loff_t *ppos)
 129 {
 130         struct ieee80211_key *key = file->private_data;
 131         char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
 132         int i, len;
 133         const u8 *rpn;
 134
 135         switch (key->conf.alg) {
 136         case ALG_WEP:
 137                 len = scnprintf(buf, sizeof(buf), "\n");
 138                 break;
 139         case ALG_TKIP:
 140                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 141                         p += scnprintf(p, sizeof(buf)+buf-p,
 142                                        "%08x %04x\n",
 143                                        key->u.tkip.rx[i].iv32,
 144                                        key->u.tkip.rx[i].iv16);
 145                 len = p - buf;
 146                 break;
 147         case ALG_CCMP:
 148                 for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) {
 149                         rpn = key->u.ccmp.rx_pn[i];
 150                         p += scnprintf(p, sizeof(buf)+buf-p,
 151                                        "%02x%02x%02x%02x%02x%02x\n",
 152                                        rpn[0], rpn[1], rpn[2],
 153                                        rpn[3], rpn[4], rpn[5]);
 154                 }
 155                 len = p - buf;
 156                 break;
 157         case ALG_AES_CMAC:
 158                 rpn = key->u.aes_cmac.rx_pn;
 159                 p += scnprintf(p, sizeof(buf)+buf-p,
 160                                "%02x%02x%02x%02x%02x%02x\n",
 161                                rpn[0], rpn[1], rpn[2],
 162                                rpn[3], rpn[4], rpn[5]);
 163                 len = p - buf;
 164                 break;
 165         default:
 166                 return 0;
 167         }
 168         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 169 }
 170 KEY_OPS(rx_spec);
 171
 172 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 173                                 size_t count, loff_t *ppos)
 174 {
 175         struct ieee80211_key *key = file->private_data;
 176         char buf[20];
 177         int len;
 178
 179         switch (key->conf.alg) {
 180         case ALG_CCMP:
 181                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 182                 break;
 183         case ALG_AES_CMAC:
 184                 len = scnprintf(buf, sizeof(buf), "%u\n",
 185                                 key->u.aes_cmac.replays);
 186                 break;
 187         default:
 188                 return 0;
 189         }
 190         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 191 }
 192 KEY_OPS(replays);
 193
 194 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 195                                   size_t count, loff_t *ppos)
 196 {
 197         struct ieee80211_key *key = file->private_data;
 198         char buf[20];
 199         int len;
 200
 201         switch (key->conf.alg) {
 202         case ALG_AES_CMAC:
 203                 len = scnprintf(buf, sizeof(buf), "%u\n",
 204                                 key->u.aes_cmac.icverrors);
 205                 break;
 206         default:
 207                 return 0;
 208         }
 209         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 210 }
 211 KEY_OPS(icverrors);
 212
 213 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 214                             size_t count, loff_t *ppos)
 215 {
 216         struct ieee80211_key *key = file->private_data;
 217         int i, res, bufsize = 2 * key->conf.keylen + 2;
 218         char *buf = kmalloc(bufsize, GFP_KERNEL);
 219         char *p = buf;
 220
 221         for (i = 0; i < key->conf.keylen; i++)
 222                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 223         p += scnprintf(p, bufsize+buf-p, "\n");
 224         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 225         kfree(buf);
 226         return res;
 227 }
 228 KEY_OPS(key);
 229
 230 #define DEBUGFS_ADD(name) \
 231         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 232                             key, &key_##name##_ops);
 233
 234 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 235   {
 236         static int keycount;
 237         char buf[50];
 238         struct sta_info *sta;
 239
 240         if (!key->local->debugfs.keys)
 241                 return;
 242
 243         sprintf(buf, "%d", keycount);
 244         key->debugfs.cnt = keycount;
 245         keycount++;
 246         key->debugfs.dir = debugfs_create_dir(buf,
 247                                         key->local->debugfs.keys);
 248
 249         if (!key->debugfs.dir)
 250                 return;
 251
 252         rcu_read_lock();
 253         sta = rcu_dereference(key->sta);
 254         if (sta)
 255                 sprintf(buf, "../../stations/%pM", sta->sta.addr);
 256         rcu_read_unlock();
 257
 258         /* using sta as a boolean is fine outside RCU lock */
 259         if (sta)
 260                 key->debugfs.stalink =
 261                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 262
 263         DEBUGFS_ADD(keylen);
 264         DEBUGFS_ADD(flags);
 265         DEBUGFS_ADD(keyidx);
 266         DEBUGFS_ADD(hw_key_idx);
 267         DEBUGFS_ADD(tx_rx_count);
 268         DEBUGFS_ADD(algorithm);
 269         DEBUGFS_ADD(tx_spec);
 270         DEBUGFS_ADD(rx_spec);
 271         DEBUGFS_ADD(replays);
 272         DEBUGFS_ADD(icverrors);
 273         DEBUGFS_ADD(key);
 274         DEBUGFS_ADD(ifindex);
 275 };
 276
 277 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 278 {
 279         if (!key)
 280                 return;
 281
 282         debugfs_remove_recursive(key->debugfs.dir);
 283         key->debugfs.dir = NULL;
 284 }
 285 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 286 {
 287         char buf[50];
 288         struct ieee80211_key *key;
 289
 290         if (!sdata->debugfs.dir)
 291                 return;
 292
 293         /* this is running under the key lock */
 294
 295         key = sdata->default_key;
 296         if (key) {
 297                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 298                 sdata->debugfs.default_key =
 299                         debugfs_create_symlink("default_key",
 300                                                sdata->debugfs.dir, buf);
 301         } else
 302                 ieee80211_debugfs_key_remove_default(sdata);
 303 }
 304
 305 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 306 {
 307         if (!sdata)
 308                 return;
 309
 310         debugfs_remove(sdata->debugfs.default_key);
 311         sdata->debugfs.default_key = NULL;
 312 }
 313
 314 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 315 {
 316         char buf[50];
 317         struct ieee80211_key *key;
 318
 319         if (!sdata->debugfs.dir)
 320                 return;
 321
 322         /* this is running under the key lock */
 323
 324         key = sdata->default_mgmt_key;
 325         if (key) {
 326                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 327                 sdata->debugfs.default_mgmt_key =
 328                         debugfs_create_symlink("default_mgmt_key",
 329                                                sdata->debugfs.dir, buf);
 330         } else
 331                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 332 }
 333
 334 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 335 {
 336         if (!sdata)
 337                 return;
 338
 339         debugfs_remove(sdata->debugfs.default_mgmt_key);
 340         sdata->debugfs.default_mgmt_key = NULL;
 341 }
 342
 343 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 344                                    struct sta_info *sta)
 345 {
 346         debugfs_remove(key->debugfs.stalink);
 347         key->debugfs.stalink = NULL;
 348 }