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, 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
  60 static ssize_t key_algorithm_read(struct file *file,
  61                                   char __user *userbuf,
  62                                   size_t count, loff_t *ppos)
  63 {
  64         char *alg;
  65         struct ieee80211_key *key = file->private_data;
  66
  67         switch (key->conf.alg) {
  68         case ALG_WEP:
  69                 alg = "WEP\n";
  70                 break;
  71         case ALG_TKIP:
  72                 alg = "TKIP\n";
  73                 break;
  74         case ALG_CCMP:
  75                 alg = "CCMP\n";
  76                 break;
  77         default:
  78                 return 0;
  79         }
  80         return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
  81 }
  82 KEY_OPS(algorithm);
  83
  84 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
  85                                 size_t count, loff_t *ppos)
  86 {
  87         const u8 *tpn;
  88         char buf[20];
  89         int len;
  90         struct ieee80211_key *key = file->private_data;
  91
  92         switch (key->conf.alg) {
  93         case ALG_WEP:
  94                 len = scnprintf(buf, sizeof(buf), "\n");
  95                 break;
  96         case ALG_TKIP:
  97                 len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
  98                                 key->u.tkip.iv32,
  99                                 key->u.tkip.iv16);
 100                 break;
 101         case ALG_CCMP:
 102                 tpn = key->u.ccmp.tx_pn;
 103                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
 104                                 tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
 105                 break;
 106         default:
 107                 return 0;
 108         }
 109         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 110 }
 111 KEY_OPS(tx_spec);
 112
 113 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
 114                                 size_t count, loff_t *ppos)
 115 {
 116         struct ieee80211_key *key = file->private_data;
 117         char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
 118         int i, len;
 119         const u8 *rpn;
 120
 121         switch (key->conf.alg) {
 122         case ALG_WEP:
 123                 len = scnprintf(buf, sizeof(buf), "\n");
 124                 break;
 125         case ALG_TKIP:
 126                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 127                         p += scnprintf(p, sizeof(buf)+buf-p,
 128                                        "%08x %04x\n",
 129                                        key->u.tkip.iv32_rx[i],
 130                                        key->u.tkip.iv16_rx[i]);
 131                 len = p - buf;
 132                 break;
 133         case ALG_CCMP:
 134                 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
 135                         rpn = key->u.ccmp.rx_pn[i];
 136                         p += scnprintf(p, sizeof(buf)+buf-p,
 137                                        "%02x%02x%02x%02x%02x%02x\n",
 138                                        rpn[0], rpn[1], rpn[2],
 139                                        rpn[3], rpn[4], rpn[5]);
 140                 }
 141                 len = p - buf;
 142                 break;
 143         default:
 144                 return 0;
 145         }
 146         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 147 }
 148 KEY_OPS(rx_spec);
 149
 150 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
 151                                 size_t count, loff_t *ppos)
 152 {
 153         struct ieee80211_key *key = file->private_data;
 154         char buf[20];
 155         int len;
 156
 157         if (key->conf.alg != ALG_CCMP)
 158                 return 0;
 159         len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
 160         return simple_read_from_buffer(userbuf, count, ppos, buf, len);
 161 }
 162 KEY_OPS(replays);
 163
 164 static ssize_t key_key_read(struct file *file, char __user *userbuf,
 165                             size_t count, loff_t *ppos)
 166 {
 167         struct ieee80211_key *key = file->private_data;
 168         int i, res, bufsize = 2 * key->conf.keylen + 2;
 169         char *buf = kmalloc(bufsize, GFP_KERNEL);
 170         char *p = buf;
 171
 172         for (i = 0; i < key->conf.keylen; i++)
 173                 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
 174         p += scnprintf(p, bufsize+buf-p, "\n");
 175         res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 176         kfree(buf);
 177         return res;
 178 }
 179 KEY_OPS(key);
 180
 181 #define DEBUGFS_ADD(name) \
 182         key->debugfs.name = debugfs_create_file(#name, 0400,\
 183                                 key->debugfs.dir, key, &key_##name##_ops);
 184
 185 void ieee80211_debugfs_key_add(struct ieee80211_local *local,
 186                                struct ieee80211_key *key)
 187 {
 188         static int keycount;
 189         char buf[20];
 190
 191         if (!local->debugfs.keys)
 192                 return;
 193
 194         sprintf(buf, "%d", keycount);
 195         keycount++;
 196         key->debugfs.dir = debugfs_create_dir(buf,
 197                                         local->debugfs.keys);
 198
 199         if (!key->debugfs.dir)
 200                 return;
 201
 202         DEBUGFS_ADD(keylen);
 203         DEBUGFS_ADD(flags);
 204         DEBUGFS_ADD(keyidx);
 205         DEBUGFS_ADD(hw_key_idx);
 206         DEBUGFS_ADD(tx_rx_count);
 207         DEBUGFS_ADD(algorithm);
 208         DEBUGFS_ADD(tx_spec);
 209         DEBUGFS_ADD(rx_spec);
 210         DEBUGFS_ADD(replays);
 211         DEBUGFS_ADD(key);
 212 };
 213
 214 #define DEBUGFS_DEL(name) \
 215         debugfs_remove(key->debugfs.name); key->debugfs.name = NULL;
 216
 217 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
 218 {
 219         if (!key)
 220                 return;
 221
 222         DEBUGFS_DEL(keylen);
 223         DEBUGFS_DEL(flags);
 224         DEBUGFS_DEL(keyidx);
 225         DEBUGFS_DEL(hw_key_idx);
 226         DEBUGFS_DEL(tx_rx_count);
 227         DEBUGFS_DEL(algorithm);
 228         DEBUGFS_DEL(tx_spec);
 229         DEBUGFS_DEL(rx_spec);
 230         DEBUGFS_DEL(replays);
 231         DEBUGFS_DEL(key);
 232
 233         debugfs_remove(key->debugfs.stalink);
 234         key->debugfs.stalink = NULL;
 235         debugfs_remove(key->debugfs.dir);
 236         key->debugfs.dir = NULL;
 237 }
 238 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
 239 {
 240         char buf[50];
 241
 242         if (!sdata->debugfsdir)
 243                 return;
 244
 245         sprintf(buf, "../keys/%d", sdata->default_key->conf.keyidx);
 246         sdata->debugfs.default_key =
 247                 debugfs_create_symlink("default_key", sdata->debugfsdir, buf);
 248 }
 249 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
 250 {
 251         if (!sdata)
 252                 return;
 253
 254         debugfs_remove(sdata->debugfs.default_key);
 255         sdata->debugfs.default_key = NULL;
 256 }
 257 void ieee80211_debugfs_key_sta_link(struct ieee80211_key *key,
 258                                     struct sta_info *sta)
 259 {
 260         char buf[50];
 261
 262         if (!key->debugfs.dir)
 263                 return;
 264
 265         sprintf(buf, "../../stations/" MAC_FMT, MAC_ARG(sta->addr));
 266         key->debugfs.stalink =
 267                 debugfs_create_symlink("station", key->debugfs.dir, buf);
 268 }
 269
 270 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
 271                                    struct sta_info *sta)
 272 {
 273         debugfs_remove(key->debugfs.stalink);
 274         key->debugfs.stalink = NULL;
 275 }