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->dev->ifindex, 20, "%d\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         default:
  80                 return 0;
  81         }
  82         return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
  83 }
  84 KEY_OPS(algorithm);
  85
  86 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  87                                 size_t count, loff_t *ppos)
  88 {
  89         const u8 *tpn;
  90         char buf[20];
  91         int len;
  92         struct ieee80211_key *key = file->private_data;
  93
  94         switch (key->conf.alg) {
  95         case ALG_WEP:
  96                 len = scnprintf(buf, sizeof(buf), "\n");
  97                 break;
  98         case ALG_TKIP:
  99                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
 100                                 key->u.tkip.tx.iv32,
 101                                 key->u.tkip.tx.iv16);
 102                 break;
 103         case ALG_CCMP:
 104                 tpn = key->u.ccmp.tx_pn;
 105                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 106                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], 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.alg) {
 124         case ALG_WEP:
 125                 len = scnprintf(buf, sizeof(buf), "\n");
 126                 break;
 127         case ALG_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 ALG_CCMP:
 136                 for (i = 0; i < NUM_RX_DATA_QUEUES; 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         default:
 146                 return 0;
 147         }
 148         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 149 }
 150 KEY_OPS(rx_spec);
 151
 152 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 153                                 size_t count, loff_t *ppos)
 154 {
 155         struct ieee80211_key *key = file->private_data;
 156         char buf[20];
 157         int len;
 158
 159         if (key->conf.alg != ALG_CCMP)
 160                 return 0;
 161         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 162         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 163 }
 164 KEY_OPS(replays);
 165
 166 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 167                             size_t count, loff_t *ppos)
 168 {
 169         struct ieee80211_key *key = file->private_data;
 170         int i, res, bufsize = 2 * key->conf.keylen + 2;
 171         char *buf = kmalloc(bufsize, GFP_KERNEL);
 172         char *p = buf;
 173
 174         for (i = 0; i < key->conf.keylen; i++)
 175                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 176         p += scnprintf(p, bufsize+buf-p, "\n");
 177         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 178         kfree(buf);
 179         return res;
 180 }
 181 KEY_OPS(key);
 182
 183 #define DEBUGFS_ADD(name) \
 184         key->debugfs.name = debugfs_create_file(#name, 0400,\
 185                                 key->debugfs.dir, key, &key_##name##_ops);
 186
 187 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
 188   {
 189         static int keycount;
 190         char buf[50];
 191         struct sta_info *sta;
 192
 193         if (!key->local->debugfs.keys)
 194                 return;
 195
 196         sprintf(buf, "%d", keycount);
 197         key->debugfs.cnt = keycount;
 198         keycount++;
 199         key->debugfs.dir = debugfs_create_dir(buf,
 200                                         key->local->debugfs.keys);
 201
 202         if (!key->debugfs.dir)
 203                 return;
 204
 205         rcu_read_lock();
 206         sta = rcu_dereference(key->sta);
 207         if (sta)
 208                 sprintf(buf, "../../stations/%pM", sta->sta.addr);
 209         rcu_read_unlock();
 210
 211         /* using sta as a boolean is fine outside RCU lock */
 212         if (sta)
 213                 key->debugfs.stalink =
 214                         debugfs_create_symlink("station", key->debugfs.dir, buf);
 215
 216         DEBUGFS_ADD(keylen);
 217         DEBUGFS_ADD(flags);
 218         DEBUGFS_ADD(keyidx);
 219         DEBUGFS_ADD(hw_key_idx);
 220         DEBUGFS_ADD(tx_rx_count);
 221         DEBUGFS_ADD(algorithm);
 222         DEBUGFS_ADD(tx_spec);
 223         DEBUGFS_ADD(rx_spec);
 224         DEBUGFS_ADD(replays);
 225         DEBUGFS_ADD(key);
 226         DEBUGFS_ADD(ifindex);
 227 };
 228
 229 #define DEBUGFS_DEL(name) \
 230         debugfs_remove(key->debugfs.name); key->debugfs.name = NULL;
 231
 232 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 233 {
 234         if (!key)
 235                 return;
 236
 237         DEBUGFS_DEL(keylen);
 238         DEBUGFS_DEL(flags);
 239         DEBUGFS_DEL(keyidx);
 240         DEBUGFS_DEL(hw_key_idx);
 241         DEBUGFS_DEL(tx_rx_count);
 242         DEBUGFS_DEL(algorithm);
 243         DEBUGFS_DEL(tx_spec);
 244         DEBUGFS_DEL(rx_spec);
 245         DEBUGFS_DEL(replays);
 246         DEBUGFS_DEL(key);
 247         DEBUGFS_DEL(ifindex);
 248
 249         debugfs_remove(key->debugfs.stalink);
 250         key->debugfs.stalink = NULL;
 251         debugfs_remove(key->debugfs.dir);
 252         key->debugfs.dir = NULL;
 253 }
 254 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 255 {
 256         char buf[50];
 257         struct ieee80211_key *key;
 258
 259         if (!sdata->debugfsdir)
 260                 return;
 261
 262         /* this is running under the key lock */
 263
 264         key = sdata->default_key;
 265         if (key) {
 266                 sprintf(buf, "../keys/%d", key->debugfs.cnt);
 267                 sdata->common_debugfs.default_key =
 268                         debugfs_create_symlink("default_key",
 269                                                sdata->debugfsdir, buf);
 270         } else
 271                 ieee80211_debugfs_key_remove_default(sdata);
 272 }
 273
 274 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 275 {
 276         if (!sdata)
 277                 return;
 278
 279         debugfs_remove(sdata->common_debugfs.default_key);
 280         sdata->common_debugfs.default_key = NULL;
 281 }
 282
 283 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 284                                    struct sta_info *sta)
 285 {
 286         debugfs_remove(key->debugfs.stalink);
 287         key->debugfs.stalink = NULL;
 288 }