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 *alg;
  68         struct ieee80211_key *key = file->private_data;
  69
  70         switch (key->conf.alg) {
  71         case ALG_WEP:
  72                 alg = "WEP\n";
  73                 break;
  74         case ALG_TKIP:
  75                 alg = "TKIP\n";
  76                 break;
  77         case ALG_CCMP:
  78                 alg = "CCMP\n";
  79                 break;
  80         case ALG_AES_CMAC:
  81                 alg = "AES-128-CMAC\n";
  82                 break;
  83         default:
  84                 return 0;
  85         }
  86         return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
  87 }
  88 KEY_OPS(algorithm);
  89
  90 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  91                                 size_t count, loff_t *ppos)
  92 {
  93         const u8 *tpn;
  94         char buf[20];
  95         int len;
  96         struct ieee80211_key *key = file->private_data;
  97
  98         switch (key->conf.alg) {
  99         case ALG_WEP:
 100                 len = scnprintf(buf, sizeof(buf), "\n");
 101                 break;
 102         case ALG_TKIP:
 103                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
 104                                 key->u.tkip.tx.iv32,
 105                                 key->u.tkip.tx.iv16);
 106                 break;
 107         case ALG_CCMP:
 108                 tpn = key->u.ccmp.tx_pn;
 109                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 110                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
 111                 break;
 112         case ALG_AES_CMAC:
 113                 tpn = key->u.aes_cmac.tx_pn;
 114                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 115                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4],
 116                                 tpn[5]);
 117                 break;
 118         default:
 119                 return 0;
 120         }
 121         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 122 }
 123 KEY_OPS(tx_spec);
 124
 125 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 126                                 size_t count, loff_t *ppos)
 127 {
 128         struct ieee80211_key *key = file->private_data;
 129         char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
 130         int i, len;
 131         const u8 *rpn;
 132
 133         switch (key->conf.alg) {
 134         case ALG_WEP:
 135                 len = scnprintf(buf, sizeof(buf), "\n");
 136                 break;
 137         case ALG_TKIP:
 138                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 139                         p += scnprintf(p, sizeof(buf)+buf-p,
 140                                        "%08x %04x\n",
 141                                        key->u.tkip.rx[i].iv32,
 142                                        key->u.tkip.rx[i].iv16);
 143                 len = p - buf;
 144                 break;
 145         case ALG_CCMP:
 146                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
 147                         rpn = key->u.ccmp.rx_pn[i];
 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                 }
 153                 len = p - buf;
 154                 break;
 155         case ALG_AES_CMAC:
 156                 rpn = key->u.aes_cmac.rx_pn;
 157                 p += scnprintf(p, sizeof(buf)+buf-p,
 158                                "%02x%02x%02x%02x%02x%02x\n",
 159                                rpn[0], rpn[1], rpn[2],
 160                                rpn[3], rpn[4], rpn[5]);
 161                 len = p - buf;
 162                 break;
 163         default:
 164                 return 0;
 165         }
 166         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 167 }
 168 KEY_OPS(rx_spec);
 169
 170 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 171                                 size_t count, loff_t *ppos)
 172 {
 173         struct ieee80211_key *key = file->private_data;
 174         char buf[20];
 175         int len;
 176
 177         switch (key->conf.alg) {
 178         case ALG_CCMP:
 179                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 180                 break;
 181         case ALG_AES_CMAC:
 182                 len = scnprintf(buf, sizeof(buf), "%u\n",
 183                                 key->u.aes_cmac.replays);
 184                 break;
 185         default:
 186                 return 0;
 187         }
 188         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 189 }
 190 KEY_OPS(replays);
 191
 192 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 193                                   size_t count, loff_t *ppos)
 194 {
 195         struct ieee80211_key *key = file->private_data;
 196         char buf[20];
 197         int len;
 198
 199         switch (key->conf.alg) {
 200         case ALG_AES_CMAC:
 201                 len = scnprintf(buf, sizeof(buf), "%u\n",
 202                                 key->u.aes_cmac.icverrors);
 203                 break;
 204         default:
 205                 return 0;
 206         }
 207         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 208 }
 209 KEY_OPS(icverrors);
 210
 211 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 212                             size_t count, loff_t *ppos)
 213 {
 214         struct ieee80211_key *key = file->private_data;
 215         int i, res, bufsize = 2 * key->conf.keylen + 2;
 216         char *buf = kmalloc(bufsize, GFP_KERNEL);
 217         char *p = buf;
 218
 219         for (i = 0; i < key->conf.keylen; i++)
 220                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 221         p += scnprintf(p, bufsize+buf-p, "\n");
 222         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 223         kfree(buf);
 224         return res;
 225 }
 226 KEY_OPS(key);
 227
 228 #define DEBUGFS_ADD(name) \
 229         debugfs_create_file(#name, 0400, key->debugfs.dir, \
 230                             key, &key_##name##_ops);
 231
 232 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 233   {
 234         static int keycount;
 235         char buf[50];
 236         struct sta_info *sta;
 237
 238         if (!key->local->debugfs.keys)
 239                 return;
 240
 241         sprintf(buf, "%d", keycount);
 242         key->debugfs.cnt = keycount;
 243         keycount++;
 244         key->debugfs.dir = debugfs_create_dir(buf,
 245                                         key->local->debugfs.keys);
 246
 247         if (!key->debugfs.dir)
 248                 return;
 249
 250         rcu_read_lock();
 251         sta = rcu_dereference(key->sta);
 252         if (sta)
 253                 sprintf(buf, "../../stations/%pM", sta->sta.addr);
 254         rcu_read_unlock();
 255
 256         /* using sta as a boolean is fine outside RCU lock */
 257         if (sta)
 258                 key->debugfs.stalink =
 259                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 260
 261         DEBUGFS_ADD(keylen);
 262         DEBUGFS_ADD(flags);
 263         DEBUGFS_ADD(keyidx);
 264         DEBUGFS_ADD(hw_key_idx);
 265         DEBUGFS_ADD(tx_rx_count);
 266         DEBUGFS_ADD(algorithm);
 267         DEBUGFS_ADD(tx_spec);
 268         DEBUGFS_ADD(rx_spec);
 269         DEBUGFS_ADD(replays);
 270         DEBUGFS_ADD(icverrors);
 271         DEBUGFS_ADD(key);
 272         DEBUGFS_ADD(ifindex);
 273 };
 274
 275 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 276 {
 277         if (!key)
 278                 return;
 279
 280         debugfs_remove_recursive(key->debugfs.dir);
 281         key->debugfs.dir = NULL;
 282 }
 283 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 284 {
 285         char buf[50];
 286         struct ieee80211_key *key;
 287
 288         if (!sdata->debugfs.dir)
 289                 return;
 290
 291         /* this is running under the key lock */
 292
 293         key = sdata->default_key;
 294         if (key) {
 295                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 296                 sdata->debugfs.default_key =
 297                         debugfs_create_symlink("default_key",
 298                                                sdata->debugfs.dir, buf);
 299         } else
 300                 ieee80211_debugfs_key_remove_default(sdata);
 301 }
 302
 303 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 304 {
 305         if (!sdata)
 306                 return;
 307
 308         debugfs_remove(sdata->debugfs.default_key);
 309         sdata->debugfs.default_key = NULL;
 310 }
 311
 312 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata)
 313 {
 314         char buf[50];
 315         struct ieee80211_key *key;
 316
 317         if (!sdata->debugfs.dir)
 318                 return;
 319
 320         /* this is running under the key lock */
 321
 322         key = sdata->default_mgmt_key;
 323         if (key) {
 324                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 325                 sdata->debugfs.default_mgmt_key =
 326                         debugfs_create_symlink("default_mgmt_key",
 327                                                sdata->debugfs.dir, buf);
 328         } else
 329                 ieee80211_debugfs_key_remove_mgmt_default(sdata);
 330 }
 331
 332 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata)
 333 {
 334         if (!sdata)
 335                 return;
 336
 337         debugfs_remove(sdata->debugfs.default_mgmt_key);
 338         sdata->debugfs.default_mgmt_key = NULL;
 339 }
 340
 341 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 342                                    struct sta_info *sta)
 343 {
 344         debugfs_remove(key->debugfs.stalink);
 345         key->debugfs.stalink = NULL;
 346 }