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 "ieee80211_key.h"
  14 #include "debugfs.h"
  15 #include "debugfs_key.h"
  16
  17 #define KEY_READ(name, 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->name);     \
  25         return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
  26 }
  27 #define KEY_READ_D(name) KEY_READ(name, 20, "%d\n")
  28
  29 #define KEY_OPS(name)                                                   \
  30 static const struct file_operations key_ ##name## _ops = {              \
  31         .read = key_##name##_read,                                      \
  32         .open = mac80211_open_file_generic,                             \
  33 }
  34
  35 #define KEY_FILE(name, format)                                          \
  36                  KEY_READ_##format(name)                                \
  37                  KEY_OPS(name)
  38
  39 KEY_FILE(keylen, D);
  40 KEY_FILE(force_sw_encrypt, D);
  41 KEY_FILE(keyidx, D);
  42 KEY_FILE(hw_key_idx, D);
  43 KEY_FILE(tx_rx_count, D);
  44
  45 static ssize_t key_algorithm_read(struct file *file,
  46                                   char __user *userbuf,
  47                                   size_t count, loff_t *ppos)
  48 {
  49         char *alg;
  50         struct ieee80211_key *key = file->private_data;
  51
  52         switch (key->alg) {
  53         case ALG_WEP:
  54                 alg = "WEP\n";
  55                 break;
  56         case ALG_TKIP:
  57                 alg = "TKIP\n";
  58                 break;
  59         case ALG_CCMP:
  60                 alg = "CCMP\n";
  61                 break;
  62         default:
  63                 return 0;
  64         }
  65         return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
  66 }
  67 KEY_OPS(algorithm);
  68
  69 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  70                                 size_t count, loff_t *ppos)
  71 {
  72         const u8 *tpn;
  73         char buf[20];
  74         int len;
  75         struct ieee80211_key *key = file->private_data;
  76
  77         switch (key->alg) {
  78         case ALG_WEP:
  79                 len = scnprintf(buf, sizeof(buf), "\n");
  80                 break;
  81         case ALG_TKIP:
  82                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
  83                                 key->u.tkip.iv32,
  84                                 key->u.tkip.iv16);
  85                 break;
  86         case ALG_CCMP:
  87                 tpn = key->u.ccmp.tx_pn;
  88                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
  89                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
  90                 break;
  91         default:
  92                 return 0;
  93         }
  94         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
  95 }
  96 KEY_OPS(tx_spec);
  97
  98 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
  99                                 size_t count, loff_t *ppos)
 100 {
 101         struct ieee80211_key *key = file->private_data;
 102         char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
 103         int i, len;
 104         const u8 *rpn;
 105
 106         switch (key->alg) {
 107         case ALG_WEP:
 108                 len = scnprintf(buf, sizeof(buf), "\n");
 109                 break;
 110         case ALG_TKIP:
 111                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 112                         p += scnprintf(p, sizeof(buf)+buf-p,
 113                                        "%08x %04x\n",
 114                                        key->u.tkip.iv32_rx[i],
 115                                        key->u.tkip.iv16_rx[i]);
 116                 len = p - buf;
 117                 break;
 118         case ALG_CCMP:
 119                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
 120                         rpn = key->u.ccmp.rx_pn[i];
 121                         p += scnprintf(p, sizeof(buf)+buf-p,
 122                                        "%02x%02x%02x%02x%02x%02x\n",
 123                                        rpn[0], rpn[1], rpn[2],
 124                                        rpn[3], rpn[4], rpn[5]);
 125                 }
 126                 len = p - buf;
 127                 break;
 128         default:
 129                 return 0;
 130         }
 131         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 132 }
 133 KEY_OPS(rx_spec);
 134
 135 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 136                                 size_t count, loff_t *ppos)
 137 {
 138         struct ieee80211_key *key = file->private_data;
 139         char buf[20];
 140         int len;
 141
 142         if (key->alg != ALG_CCMP)
 143                 return 0;
 144         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 145         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 146 }
 147 KEY_OPS(replays);
 148
 149 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 150                             size_t count, loff_t *ppos)
 151 {
 152         struct ieee80211_key *key = file->private_data;
 153         int i, res, bufsize = 2*key->keylen+2;
 154         char *buf = kmalloc(bufsize, GFP_KERNEL);
 155         char *p = buf;
 156
 157         for (i = 0; i < key->keylen; i++)
 158                 p += scnprintf(p, bufsize+buf-p, "%02x", key->key[i]);
 159         p += scnprintf(p, bufsize+buf-p, "\n");
 160         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 161         kfree(buf);
 162         return res;
 163 }
 164 KEY_OPS(key);
 165
 166 #define DEBUGFS_ADD(name) \
 167         key->debugfs.name = debugfs_create_file(#name, 0400,\
 168                                 key->debugfs.dir, key, &key_##name##_ops);
 169
 170 void ieee80211_debugfs_key_add(struct ieee80211_local *local,
 171                                struct ieee80211_key *key)
 172 {
 173         static int keycount;
 174         char buf[20];
 175
 176         if (!local->debugfs.keys)
 177                 return;
 178
 179         sprintf(buf, "%d", keycount);
 180         keycount++;
 181         key->debugfs.dir = debugfs_create_dir(buf,
 182                                         local->debugfs.keys);
 183
 184         if (!key->debugfs.dir)
 185                 return;
 186
 187         DEBUGFS_ADD(keylen);
 188         DEBUGFS_ADD(force_sw_encrypt);
 189         DEBUGFS_ADD(keyidx);
 190         DEBUGFS_ADD(hw_key_idx);
 191         DEBUGFS_ADD(tx_rx_count);
 192         DEBUGFS_ADD(algorithm);
 193         DEBUGFS_ADD(tx_spec);
 194         DEBUGFS_ADD(rx_spec);
 195         DEBUGFS_ADD(replays);
 196         DEBUGFS_ADD(key);
 197 };
 198
 199 #define DEBUGFS_DEL(name) \
 200         debugfs_remove(key->debugfs.name); key->debugfs.name = NULL;
 201
 202 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 203 {
 204         if (!key)
 205                 return;
 206
 207         DEBUGFS_DEL(keylen);
 208         DEBUGFS_DEL(force_sw_encrypt);
 209         DEBUGFS_DEL(keyidx);
 210         DEBUGFS_DEL(hw_key_idx);
 211         DEBUGFS_DEL(tx_rx_count);
 212         DEBUGFS_DEL(algorithm);
 213         DEBUGFS_DEL(tx_spec);
 214         DEBUGFS_DEL(rx_spec);
 215         DEBUGFS_DEL(replays);
 216         DEBUGFS_DEL(key);
 217
 218         debugfs_remove(key->debugfs.stalink);
 219         key->debugfs.stalink = NULL;
 220         debugfs_remove(key->debugfs.dir);
 221         key->debugfs.dir = NULL;
 222 }
 223 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 224 {
 225         char buf[50];
 226
 227         if (!sdata->debugfsdir)
 228                 return;
 229
 230         sprintf(buf, "../keys/%d", sdata->default_key->keyidx);
 231         sdata->debugfs.default_key =
 232                 debugfs_create_symlink("default_key", sdata->debugfsdir, buf);
 233 }
 234 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 235 {
 236         if (!sdata)
 237                 return;
 238
 239         debugfs_remove(sdata->debugfs.default_key);
 240         sdata->debugfs.default_key = NULL;
 241 }
 242 void ieee80211_debugfs_key_sta_link(struct ieee80211_key *key,
 243                                     struct sta_info *sta)
 244 {
 245         char buf[50];
 246
 247         if (!key->debugfs.dir)
 248                 return;
 249
 250         sprintf(buf, "../../stations/" MAC_FMT, MAC_ARG(sta->addr));
 251         key->debugfs.stalink =
 252                 debugfs_create_symlink("station", key->debugfs.dir, buf);
 253 }
 254
 255 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 256                                    struct sta_info *sta)
 257 {
 258         debugfs_remove(key->debugfs.stalink);
 259         key->debugfs.stalink = NULL;
 260 }