net/mac80211/debugfs_netdev.c

   1 /*
   2  * Copyright (c) 2006   Jiri Benc <jbenc@suse.cz>
   3  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/device.h>
  12 #include <linux/if.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/rtnetlink.h>
  16 #include <linux/slab.h>
  17 #include <linux/notifier.h>
  18 #include <net/mac80211.h>
  19 #include <net/cfg80211.h>
  20 #include "ieee80211_i.h"
  21 #include "rate.h"
  22 #include "debugfs.h"
  23 #include "debugfs_netdev.h"
  24
  25 static ssize_t ieee80211_if_read(
  26         struct ieee80211_sub_if_data *sdata,
  27         char __user *userbuf,
  28         size_t count, loff_t *ppos,
  29         ssize_t (*format)(const struct ieee80211_sub_if_data *, char *, int))
  30 {
  31         char buf[70];
  32         ssize_t ret = -EINVAL;
  33
  34         read_lock(&dev_base_lock);
  35         if (sdata->dev->reg_state == NETREG_REGISTERED)
  36                 ret = (*format)(sdata, buf, sizeof(buf));
  37         read_unlock(&dev_base_lock);
  38
  39         if (ret >= 0)
  40                 ret = simple_read_from_buffer(userbuf, count, ppos, buf, ret);
  41
  42         return ret;
  43 }
  44
  45 static ssize_t ieee80211_if_write(
  46         struct ieee80211_sub_if_data *sdata,
  47         const char __user *userbuf,
  48         size_t count, loff_t *ppos,
  49         ssize_t (*write)(struct ieee80211_sub_if_data *, const char *, int))
  50 {
  51         u8 *buf;
  52         ssize_t ret;
  53
  54         buf = kmalloc(count, GFP_KERNEL);
  55         if (!buf)
  56                 return -ENOMEM;
  57
  58         ret = -EFAULT;
  59         if (copy_from_user(buf, userbuf, count))
  60                 goto freebuf;
  61
  62         ret = -ENODEV;
  63         rtnl_lock();
  64         if (sdata->dev->reg_state == NETREG_REGISTERED)
  65                 ret = (*write)(sdata, buf, count);
  66         rtnl_unlock();
  67
  68 freebuf:
  69         kfree(buf);
  70         return ret;
  71 }
  72
  73 #define IEEE80211_IF_FMT(name, field, format_string)                    \
  74 static ssize_t ieee80211_if_fmt_##name(                                 \
  75         const struct ieee80211_sub_if_data *sdata, char *buf,           \
  76         int buflen)                                                     \
  77 {                                                                       \
  78         return scnprintf(buf, buflen, format_string, sdata->field);     \
  79 }
  80 #define IEEE80211_IF_FMT_DEC(name, field)                               \
  81                 IEEE80211_IF_FMT(name, field, "%d\n")
  82 #define IEEE80211_IF_FMT_HEX(name, field)                               \
  83                 IEEE80211_IF_FMT(name, field, "%#x\n")
  84 #define IEEE80211_IF_FMT_LHEX(name, field)                              \
  85                 IEEE80211_IF_FMT(name, field, "%#lx\n")
  86 #define IEEE80211_IF_FMT_SIZE(name, field)                              \
  87                 IEEE80211_IF_FMT(name, field, "%zd\n")
  88
  89 #define IEEE80211_IF_FMT_ATOMIC(name, field)                            \
  90 static ssize_t ieee80211_if_fmt_##name(                                 \
  91         const struct ieee80211_sub_if_data *sdata,                      \
  92         char *buf, int buflen)                                          \
  93 {                                                                       \
  94         return scnprintf(buf, buflen, "%d\n", atomic_read(&sdata->field));\
  95 }
  96
  97 #define IEEE80211_IF_FMT_MAC(name, field)                               \
  98 static ssize_t ieee80211_if_fmt_##name(                                 \
  99         const struct ieee80211_sub_if_data *sdata, char *buf,           \
 100         int buflen)                                                     \
 101 {                                                                       \
 102         return scnprintf(buf, buflen, "%pM\n", sdata->field);           \
 103 }
 104
 105 #define IEEE80211_IF_FMT_DEC_DIV_16(name, field)                        \
 106 static ssize_t ieee80211_if_fmt_##name(                                 \
 107         const struct ieee80211_sub_if_data *sdata,                      \
 108         char *buf, int buflen)                                          \
 109 {                                                                       \
 110         return scnprintf(buf, buflen, "%d\n", sdata->field / 16);       \
 111 }
 112
 113 #define __IEEE80211_IF_FILE(name, _write)                               \
 114 static ssize_t ieee80211_if_read_##name(struct file *file,              \
 115                                         char __user *userbuf,           \
 116                                         size_t count, loff_t *ppos)     \
 117 {                                                                       \
 118         return ieee80211_if_read(file->private_data,                    \
 119                                  userbuf, count, ppos,                  \
 120                                  ieee80211_if_fmt_##name);              \
 121 }                                                                       \
 122 static const struct file_operations name##_ops = {                      \
 123         .read = ieee80211_if_read_##name,                               \
 124         .write = (_write),                                              \
 125         .open = mac80211_open_file_generic,                             \
 126         .llseek = generic_file_llseek,                                  \
 127 }
 128
 129 #define __IEEE80211_IF_FILE_W(name)                                     \
 130 static ssize_t ieee80211_if_write_##name(struct file *file,             \
 131                                          const char __user *userbuf,    \
 132                                          size_t count, loff_t *ppos)    \
 133 {                                                                       \
 134         return ieee80211_if_write(file->private_data, userbuf, count,   \
 135                                   ppos, ieee80211_if_parse_##name);     \
 136 }                                                                       \
 137 __IEEE80211_IF_FILE(name, ieee80211_if_write_##name)
 138
 139
 140 #define IEEE80211_IF_FILE(name, field, format)                          \
 141                 IEEE80211_IF_FMT_##format(name, field)                  \
 142                 __IEEE80211_IF_FILE(name, NULL)
 143
 144 /* common attributes */
 145 IEEE80211_IF_FILE(drop_unencrypted, drop_unencrypted, DEC);
 146 IEEE80211_IF_FILE(rc_rateidx_mask_2ghz, rc_rateidx_mask[IEEE80211_BAND_2GHZ],
 147                   HEX);
 148 IEEE80211_IF_FILE(rc_rateidx_mask_5ghz, rc_rateidx_mask[IEEE80211_BAND_5GHZ],
 149                   HEX);
 150 IEEE80211_IF_FILE(flags, flags, HEX);
 151 IEEE80211_IF_FILE(state, state, LHEX);
 152 IEEE80211_IF_FILE(channel_type, vif.bss_conf.channel_type, DEC);
 153
 154 /* STA attributes */
 155 IEEE80211_IF_FILE(bssid, u.mgd.bssid, MAC);
 156 IEEE80211_IF_FILE(aid, u.mgd.aid, DEC);
 157 IEEE80211_IF_FILE(last_beacon, u.mgd.last_beacon_signal, DEC);
 158 IEEE80211_IF_FILE(ave_beacon, u.mgd.ave_beacon_signal, DEC_DIV_16);
 159
 160 static int ieee80211_set_smps(struct ieee80211_sub_if_data *sdata,
 161                               enum ieee80211_smps_mode smps_mode)
 162 {
 163         struct ieee80211_local *local = sdata->local;
 164         int err;
 165
 166         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_STATIC_SMPS) &&
 167             smps_mode == IEEE80211_SMPS_STATIC)
 168                 return -EINVAL;
 169
 170         /* auto should be dynamic if in PS mode */
 171         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) &&
 172             (smps_mode == IEEE80211_SMPS_DYNAMIC ||
 173              smps_mode == IEEE80211_SMPS_AUTOMATIC))
 174                 return -EINVAL;
 175
 176         /* supported only on managed interfaces for now */
 177         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 178                 return -EOPNOTSUPP;
 179
 180         mutex_lock(&local->iflist_mtx);
 181         err = __ieee80211_request_smps(sdata, smps_mode);
 182         mutex_unlock(&local->iflist_mtx);
 183
 184         return err;
 185 }
 186
 187 static const char *smps_modes[IEEE80211_SMPS_NUM_MODES] = {
 188         [IEEE80211_SMPS_AUTOMATIC] = "auto",
 189         [IEEE80211_SMPS_OFF] = "off",
 190         [IEEE80211_SMPS_STATIC] = "static",
 191         [IEEE80211_SMPS_DYNAMIC] = "dynamic",
 192 };
 193
 194 static ssize_t ieee80211_if_fmt_smps(const struct ieee80211_sub_if_data *sdata,
 195                                      char *buf, int buflen)
 196 {
 197         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 198                 return -EOPNOTSUPP;
 199
 200         return snprintf(buf, buflen, "request: %s\nused: %s\n",
 201                         smps_modes[sdata->u.mgd.req_smps],
 202                         smps_modes[sdata->u.mgd.ap_smps]);
 203 }
 204
 205 static ssize_t ieee80211_if_parse_smps(struct ieee80211_sub_if_data *sdata,
 206                                        const char *buf, int buflen)
 207 {
 208         enum ieee80211_smps_mode mode;
 209
 210         for (mode = 0; mode < IEEE80211_SMPS_NUM_MODES; mode++) {
 211                 if (strncmp(buf, smps_modes[mode], buflen) == 0) {
 212                         int err = ieee80211_set_smps(sdata, mode);
 213                         if (!err)
 214                                 return buflen;
 215                         return err;
 216                 }
 217         }
 218
 219         return -EINVAL;
 220 }
 221
 222 __IEEE80211_IF_FILE_W(smps);
 223
 224 static ssize_t ieee80211_if_fmt_tkip_mic_test(
 225         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 226 {
 227         return -EOPNOTSUPP;
 228 }
 229
 230 static int hwaddr_aton(const char *txt, u8 *addr)
 231 {
 232         int i;
 233
 234         for (i = 0; i < ETH_ALEN; i++) {
 235                 int a, b;
 236
 237                 a = hex_to_bin(*txt++);
 238                 if (a < 0)
 239                         return -1;
 240                 b = hex_to_bin(*txt++);
 241                 if (b < 0)
 242                         return -1;
 243                 *addr++ = (a << 4) | b;
 244                 if (i < 5 && *txt++ != ':')
 245                         return -1;
 246         }
 247
 248         return 0;
 249 }
 250
 251 static ssize_t ieee80211_if_parse_tkip_mic_test(
 252         struct ieee80211_sub_if_data *sdata, const char *buf, int buflen)
 253 {
 254         struct ieee80211_local *local = sdata->local;
 255         u8 addr[ETH_ALEN];
 256         struct sk_buff *skb;
 257         struct ieee80211_hdr *hdr;
 258         __le16 fc;
 259
 260         /*
 261          * Assume colon-delimited MAC address with possible white space
 262          * following.
 263          */
 264         if (buflen < 3 * ETH_ALEN - 1)
 265                 return -EINVAL;
 266         if (hwaddr_aton(buf, addr) < 0)
 267                 return -EINVAL;
 268
 269         if (!ieee80211_sdata_running(sdata))
 270                 return -ENOTCONN;
 271
 272         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24 + 100);
 273         if (!skb)
 274                 return -ENOMEM;
 275         skb_reserve(skb, local->hw.extra_tx_headroom);
 276
 277         hdr = (struct ieee80211_hdr *) skb_put(skb, 24);
 278         memset(hdr, 0, 24);
 279         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 280
 281         switch (sdata->vif.type) {
 282         case NL80211_IFTYPE_AP:
 283                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 284                 /* DA BSSID SA */
 285                 memcpy(hdr->addr1, addr, ETH_ALEN);
 286                 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
 287                 memcpy(hdr->addr3, sdata->vif.addr, ETH_ALEN);
 288                 break;
 289         case NL80211_IFTYPE_STATION:
 290                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 291                 /* BSSID SA DA */
 292                 if (sdata->vif.bss_conf.bssid == NULL) {
 293                         dev_kfree_skb(skb);
 294                         return -ENOTCONN;
 295                 }
 296                 memcpy(hdr->addr1, sdata->vif.bss_conf.bssid, ETH_ALEN);
 297                 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
 298                 memcpy(hdr->addr3, addr, ETH_ALEN);
 299                 break;
 300         default:
 301                 dev_kfree_skb(skb);
 302                 return -EOPNOTSUPP;
 303         }
 304         hdr->frame_control = fc;
 305
 306         /*
 307          * Add some length to the test frame to make it look bit more valid.
 308          * The exact contents does not matter since the recipient is required
 309          * to drop this because of the Michael MIC failure.
 310          */
 311         memset(skb_put(skb, 50), 0, 50);
 312
 313         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_TKIP_MIC_FAILURE;
 314
 315         ieee80211_tx_skb(sdata, skb);
 316
 317         return buflen;
 318 }
 319
 320 __IEEE80211_IF_FILE_W(tkip_mic_test);
 321
 322 /* AP attributes */
 323 IEEE80211_IF_FILE(num_sta_ps, u.ap.num_sta_ps, ATOMIC);
 324 IEEE80211_IF_FILE(dtim_count, u.ap.dtim_count, DEC);
 325
 326 static ssize_t ieee80211_if_fmt_num_buffered_multicast(
 327         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 328 {
 329         return scnprintf(buf, buflen, "%u\n",
 330                          skb_queue_len(&sdata->u.ap.ps_bc_buf));
 331 }
 332 __IEEE80211_IF_FILE(num_buffered_multicast, NULL);
 333
 334 /* WDS attributes */
 335 IEEE80211_IF_FILE(peer, u.wds.remote_addr, MAC);
 336
 337 #ifdef CONFIG_MAC80211_MESH
 338 /* Mesh stats attributes */
 339 IEEE80211_IF_FILE(fwded_mcast, u.mesh.mshstats.fwded_mcast, DEC);
 340 IEEE80211_IF_FILE(fwded_unicast, u.mesh.mshstats.fwded_unicast, DEC);
 341 IEEE80211_IF_FILE(fwded_frames, u.mesh.mshstats.fwded_frames, DEC);
 342 IEEE80211_IF_FILE(dropped_frames_ttl, u.mesh.mshstats.dropped_frames_ttl, DEC);
 343 IEEE80211_IF_FILE(dropped_frames_no_route,
 344                 u.mesh.mshstats.dropped_frames_no_route, DEC);
 345 IEEE80211_IF_FILE(estab_plinks, u.mesh.mshstats.estab_plinks, ATOMIC);
 346
 347 /* Mesh parameters */
 348 IEEE80211_IF_FILE(dot11MeshMaxRetries,
 349                 u.mesh.mshcfg.dot11MeshMaxRetries, DEC);
 350 IEEE80211_IF_FILE(dot11MeshRetryTimeout,
 351                 u.mesh.mshcfg.dot11MeshRetryTimeout, DEC);
 352 IEEE80211_IF_FILE(dot11MeshConfirmTimeout,
 353                 u.mesh.mshcfg.dot11MeshConfirmTimeout, DEC);
 354 IEEE80211_IF_FILE(dot11MeshHoldingTimeout,
 355                 u.mesh.mshcfg.dot11MeshHoldingTimeout, DEC);
 356 IEEE80211_IF_FILE(dot11MeshTTL, u.mesh.mshcfg.dot11MeshTTL, DEC);
 357 IEEE80211_IF_FILE(element_ttl, u.mesh.mshcfg.element_ttl, DEC);
 358 IEEE80211_IF_FILE(auto_open_plinks, u.mesh.mshcfg.auto_open_plinks, DEC);
 359 IEEE80211_IF_FILE(dot11MeshMaxPeerLinks,
 360                 u.mesh.mshcfg.dot11MeshMaxPeerLinks, DEC);
 361 IEEE80211_IF_FILE(dot11MeshHWMPactivePathTimeout,
 362                 u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout, DEC);
 363 IEEE80211_IF_FILE(dot11MeshHWMPpreqMinInterval,
 364                 u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval, DEC);
 365 IEEE80211_IF_FILE(dot11MeshHWMPnetDiameterTraversalTime,
 366                 u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime, DEC);
 367 IEEE80211_IF_FILE(dot11MeshHWMPmaxPREQretries,
 368                 u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries, DEC);
 369 IEEE80211_IF_FILE(path_refresh_time,
 370                 u.mesh.mshcfg.path_refresh_time, DEC);
 371 IEEE80211_IF_FILE(min_discovery_timeout,
 372                 u.mesh.mshcfg.min_discovery_timeout, DEC);
 373 IEEE80211_IF_FILE(dot11MeshHWMPRootMode,
 374                 u.mesh.mshcfg.dot11MeshHWMPRootMode, DEC);
 375 #endif
 376
 377
 378 #define DEBUGFS_ADD(name) \
 379         debugfs_create_file(#name, 0400, sdata->debugfs.dir, \
 380                             sdata, &name##_ops);
 381
 382 #define DEBUGFS_ADD_MODE(name, mode) \
 383         debugfs_create_file(#name, mode, sdata->debugfs.dir, \
 384                             sdata, &name##_ops);
 385
 386 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 387 {
 388         DEBUGFS_ADD(drop_unencrypted);
 389         DEBUGFS_ADD(flags);
 390         DEBUGFS_ADD(state);
 391         DEBUGFS_ADD(channel_type);
 392         DEBUGFS_ADD(rc_rateidx_mask_2ghz);
 393         DEBUGFS_ADD(rc_rateidx_mask_5ghz);
 394
 395         DEBUGFS_ADD(bssid);
 396         DEBUGFS_ADD(aid);
 397         DEBUGFS_ADD(last_beacon);
 398         DEBUGFS_ADD(ave_beacon);
 399         DEBUGFS_ADD_MODE(smps, 0600);
 400         DEBUGFS_ADD_MODE(tkip_mic_test, 0200);
 401 }
 402
 403 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 404 {
 405         DEBUGFS_ADD(drop_unencrypted);
 406         DEBUGFS_ADD(flags);
 407         DEBUGFS_ADD(state);
 408         DEBUGFS_ADD(channel_type);
 409         DEBUGFS_ADD(rc_rateidx_mask_2ghz);
 410         DEBUGFS_ADD(rc_rateidx_mask_5ghz);
 411
 412         DEBUGFS_ADD(num_sta_ps);
 413         DEBUGFS_ADD(dtim_count);
 414         DEBUGFS_ADD(num_buffered_multicast);
 415         DEBUGFS_ADD_MODE(tkip_mic_test, 0200);
 416 }
 417
 418 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 419 {
 420         DEBUGFS_ADD(drop_unencrypted);
 421         DEBUGFS_ADD(flags);
 422         DEBUGFS_ADD(state);
 423         DEBUGFS_ADD(channel_type);
 424         DEBUGFS_ADD(rc_rateidx_mask_2ghz);
 425         DEBUGFS_ADD(rc_rateidx_mask_5ghz);
 426
 427         DEBUGFS_ADD(peer);
 428 }
 429
 430 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 431 {
 432         DEBUGFS_ADD(drop_unencrypted);
 433         DEBUGFS_ADD(flags);
 434         DEBUGFS_ADD(state);
 435         DEBUGFS_ADD(channel_type);
 436         DEBUGFS_ADD(rc_rateidx_mask_2ghz);
 437         DEBUGFS_ADD(rc_rateidx_mask_5ghz);
 438 }
 439
 440 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 441 {
 442         DEBUGFS_ADD(flags);
 443         DEBUGFS_ADD(state);
 444         DEBUGFS_ADD(channel_type);
 445 }
 446
 447 #ifdef CONFIG_MAC80211_MESH
 448
 449 static void add_mesh_stats(struct ieee80211_sub_if_data *sdata)
 450 {
 451         struct dentry *dir = debugfs_create_dir("mesh_stats",
 452                                                 sdata->debugfs.dir);
 453
 454 #define MESHSTATS_ADD(name)\
 455         debugfs_create_file(#name, 0400, dir, sdata, &name##_ops);
 456
 457         MESHSTATS_ADD(fwded_mcast);
 458         MESHSTATS_ADD(fwded_unicast);
 459         MESHSTATS_ADD(fwded_frames);
 460         MESHSTATS_ADD(dropped_frames_ttl);
 461         MESHSTATS_ADD(dropped_frames_no_route);
 462         MESHSTATS_ADD(estab_plinks);
 463 #undef MESHSTATS_ADD
 464 }
 465
 466 static void add_mesh_config(struct ieee80211_sub_if_data *sdata)
 467 {
 468         struct dentry *dir = debugfs_create_dir("mesh_config",
 469                                                 sdata->debugfs.dir);
 470
 471 #define MESHPARAMS_ADD(name) \
 472         debugfs_create_file(#name, 0600, dir, sdata, &name##_ops);
 473
 474         MESHPARAMS_ADD(dot11MeshMaxRetries);
 475         MESHPARAMS_ADD(dot11MeshRetryTimeout);
 476         MESHPARAMS_ADD(dot11MeshConfirmTimeout);
 477         MESHPARAMS_ADD(dot11MeshHoldingTimeout);
 478         MESHPARAMS_ADD(dot11MeshTTL);
 479         MESHPARAMS_ADD(element_ttl);
 480         MESHPARAMS_ADD(auto_open_plinks);
 481         MESHPARAMS_ADD(dot11MeshMaxPeerLinks);
 482         MESHPARAMS_ADD(dot11MeshHWMPactivePathTimeout);
 483         MESHPARAMS_ADD(dot11MeshHWMPpreqMinInterval);
 484         MESHPARAMS_ADD(dot11MeshHWMPnetDiameterTraversalTime);
 485         MESHPARAMS_ADD(dot11MeshHWMPmaxPREQretries);
 486         MESHPARAMS_ADD(path_refresh_time);
 487         MESHPARAMS_ADD(min_discovery_timeout);
 488
 489 #undef MESHPARAMS_ADD
 490 }
 491 #endif
 492
 493 static void add_files(struct ieee80211_sub_if_data *sdata)
 494 {
 495         if (!sdata->debugfs.dir)
 496                 return;
 497
 498         switch (sdata->vif.type) {
 499         case NL80211_IFTYPE_MESH_POINT:
 500 #ifdef CONFIG_MAC80211_MESH
 501                 add_mesh_stats(sdata);
 502                 add_mesh_config(sdata);
 503 #endif
 504                 break;
 505         case NL80211_IFTYPE_STATION:
 506                 add_sta_files(sdata);
 507                 break;
 508         case NL80211_IFTYPE_ADHOC:
 509                 /* XXX */
 510                 break;
 511         case NL80211_IFTYPE_AP:
 512                 add_ap_files(sdata);
 513                 break;
 514         case NL80211_IFTYPE_WDS:
 515                 add_wds_files(sdata);
 516                 break;
 517         case NL80211_IFTYPE_MONITOR:
 518                 add_monitor_files(sdata);
 519                 break;
 520         case NL80211_IFTYPE_AP_VLAN:
 521                 add_vlan_files(sdata);
 522                 break;
 523         default:
 524                 break;
 525         }
 526 }
 527
 528 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 529 {
 530         char buf[10+IFNAMSIZ];
 531
 532         sprintf(buf, "netdev:%s", sdata->name);
 533         sdata->debugfs.dir = debugfs_create_dir(buf,
 534                 sdata->local->hw.wiphy->debugfsdir);
 535         if (sdata->debugfs.dir)
 536                 sdata->debugfs.subdir_stations = debugfs_create_dir("stations",
 537                         sdata->debugfs.dir);
 538         add_files(sdata);
 539 }
 540
 541 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 542 {
 543         if (!sdata->debugfs.dir)
 544                 return;
 545
 546         debugfs_remove_recursive(sdata->debugfs.dir);
 547         sdata->debugfs.dir = NULL;
 548 }
 549
 550 void ieee80211_debugfs_rename_netdev(struct ieee80211_sub_if_data *sdata)
 551 {
 552         struct dentry *dir;
 553         char buf[10 + IFNAMSIZ];
 554
 555         dir = sdata->debugfs.dir;
 556
 557         if (!dir)
 558                 return;
 559
 560         sprintf(buf, "netdev:%s", sdata->name);
 561         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 562                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 563                        "dir to %s\n", buf);
 564 }