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/notifier.h>
  17 #include <net/mac80211.h>
  18 #include <net/cfg80211.h>
  19 #include "ieee80211_i.h"
  20 #include "ieee80211_rate.h"
  21 #include "debugfs.h"
  22 #include "debugfs_netdev.h"
  23
  24 static ssize_t ieee80211_if_read(
  25         struct ieee80211_sub_if_data *sdata,
  26         char __user *userbuf,
  27         size_t count, loff_t *ppos,
  28         ssize_t (*format)(const struct ieee80211_sub_if_data *, char *, int))
  29 {
  30         char buf[70];
  31         ssize_t ret = -EINVAL;
  32
  33         read_lock(&dev_base_lock);
  34         if (sdata->dev->reg_state == NETREG_REGISTERED) {
  35                 ret = (*format)(sdata, buf, sizeof(buf));
  36                 ret = simple_read_from_buffer(userbuf, count, ppos, buf, ret);
  37         }
  38         read_unlock(&dev_base_lock);
  39         return ret;
  40 }
  41
  42 #define IEEE80211_IF_FMT(name, field, format_string)                    \
  43 static ssize_t ieee80211_if_fmt_##name(                                 \
  44         const struct ieee80211_sub_if_data *sdata, char *buf,           \
  45         int buflen)                                                     \
  46 {                                                                       \
  47         return scnprintf(buf, buflen, format_string, sdata->field);     \
  48 }
  49 #define IEEE80211_IF_FMT_DEC(name, field)                               \
  50                 IEEE80211_IF_FMT(name, field, "%d\n")
  51 #define IEEE80211_IF_FMT_HEX(name, field)                               \
  52                 IEEE80211_IF_FMT(name, field, "%#x\n")
  53 #define IEEE80211_IF_FMT_SIZE(name, field)                              \
  54                 IEEE80211_IF_FMT(name, field, "%zd\n")
  55
  56 #define IEEE80211_IF_FMT_ATOMIC(name, field)                            \
  57 static ssize_t ieee80211_if_fmt_##name(                                 \
  58         const struct ieee80211_sub_if_data *sdata,                      \
  59         char *buf, int buflen)                                          \
  60 {                                                                       \
  61         return scnprintf(buf, buflen, "%d\n", atomic_read(&sdata->field));\
  62 }
  63
  64 #define IEEE80211_IF_FMT_MAC(name, field)                               \
  65 static ssize_t ieee80211_if_fmt_##name(                                 \
  66         const struct ieee80211_sub_if_data *sdata, char *buf,           \
  67         int buflen)                                                     \
  68 {                                                                       \
  69         DECLARE_MAC_BUF(mac);                                           \
  70         return scnprintf(buf, buflen, "%s\n", print_mac(mac, sdata->field));\
  71 }
  72
  73 #define __IEEE80211_IF_FILE(name)                                       \
  74 static ssize_t ieee80211_if_read_##name(struct file *file,              \
  75                                         char __user *userbuf,           \
  76                                         size_t count, loff_t *ppos)     \
  77 {                                                                       \
  78         return ieee80211_if_read(file->private_data,                    \
  79                                  userbuf, count, ppos,                  \
  80                                  ieee80211_if_fmt_##name);              \
  81 }                                                                       \
  82 static const struct file_operations name##_ops = {                      \
  83         .read = ieee80211_if_read_##name,                               \
  84         .open = mac80211_open_file_generic,                             \
  85 }
  86
  87 #define IEEE80211_IF_FILE(name, field, format)                          \
  88                 IEEE80211_IF_FMT_##format(name, field)                  \
  89                 __IEEE80211_IF_FILE(name)
  90
  91 /* common attributes */
  92 IEEE80211_IF_FILE(channel_use, channel_use, DEC);
  93 IEEE80211_IF_FILE(drop_unencrypted, drop_unencrypted, DEC);
  94 IEEE80211_IF_FILE(eapol, eapol, DEC);
  95 IEEE80211_IF_FILE(ieee8021_x, ieee802_1x, DEC);
  96
  97 /* STA/IBSS attributes */
  98 IEEE80211_IF_FILE(state, u.sta.state, DEC);
  99 IEEE80211_IF_FILE(bssid, u.sta.bssid, MAC);
 100 IEEE80211_IF_FILE(prev_bssid, u.sta.prev_bssid, MAC);
 101 IEEE80211_IF_FILE(ssid_len, u.sta.ssid_len, SIZE);
 102 IEEE80211_IF_FILE(aid, u.sta.aid, DEC);
 103 IEEE80211_IF_FILE(ap_capab, u.sta.ap_capab, HEX);
 104 IEEE80211_IF_FILE(capab, u.sta.capab, HEX);
 105 IEEE80211_IF_FILE(extra_ie_len, u.sta.extra_ie_len, SIZE);
 106 IEEE80211_IF_FILE(auth_tries, u.sta.auth_tries, DEC);
 107 IEEE80211_IF_FILE(assoc_tries, u.sta.assoc_tries, DEC);
 108 IEEE80211_IF_FILE(auth_algs, u.sta.auth_algs, HEX);
 109 IEEE80211_IF_FILE(auth_alg, u.sta.auth_alg, DEC);
 110 IEEE80211_IF_FILE(auth_transaction, u.sta.auth_transaction, DEC);
 111
 112 static ssize_t ieee80211_if_fmt_flags(
 113         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 114 {
 115         return scnprintf(buf, buflen, "%s%s%s%s%s%s%s\n",
 116                  sdata->u.sta.flags & IEEE80211_STA_SSID_SET ? "SSID\n" : "",
 117                  sdata->u.sta.flags & IEEE80211_STA_BSSID_SET ? "BSSID\n" : "",
 118                  sdata->u.sta.flags & IEEE80211_STA_PREV_BSSID_SET ? "prev BSSID\n" : "",
 119                  sdata->u.sta.flags & IEEE80211_STA_AUTHENTICATED ? "AUTH\n" : "",
 120                  sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED ? "ASSOC\n" : "",
 121                  sdata->u.sta.flags & IEEE80211_STA_PROBEREQ_POLL ? "PROBEREQ POLL\n" : "",
 122                  sdata->flags & IEEE80211_SDATA_USE_PROTECTION ? "CTS prot\n" : "");
 123 }
 124 __IEEE80211_IF_FILE(flags);
 125
 126 /* AP attributes */
 127 IEEE80211_IF_FILE(num_sta_ps, u.ap.num_sta_ps, ATOMIC);
 128 IEEE80211_IF_FILE(dtim_period, u.ap.dtim_period, DEC);
 129 IEEE80211_IF_FILE(dtim_count, u.ap.dtim_count, DEC);
 130 IEEE80211_IF_FILE(num_beacons, u.ap.num_beacons, DEC);
 131 IEEE80211_IF_FILE(force_unicast_rateidx, u.ap.force_unicast_rateidx, DEC);
 132 IEEE80211_IF_FILE(max_ratectrl_rateidx, u.ap.max_ratectrl_rateidx, DEC);
 133
 134 static ssize_t ieee80211_if_fmt_num_buffered_multicast(
 135         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 136 {
 137         return scnprintf(buf, buflen, "%u\n",
 138                          skb_queue_len(&sdata->u.ap.ps_bc_buf));
 139 }
 140 __IEEE80211_IF_FILE(num_buffered_multicast);
 141
 142 static ssize_t ieee80211_if_fmt_beacon_head_len(
 143         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 144 {
 145         if (sdata->u.ap.beacon_head)
 146                 return scnprintf(buf, buflen, "%d\n",
 147                                  sdata->u.ap.beacon_head_len);
 148         return scnprintf(buf, buflen, "\n");
 149 }
 150 __IEEE80211_IF_FILE(beacon_head_len);
 151
 152 static ssize_t ieee80211_if_fmt_beacon_tail_len(
 153         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 154 {
 155         if (sdata->u.ap.beacon_tail)
 156                 return scnprintf(buf, buflen, "%d\n",
 157                                  sdata->u.ap.beacon_tail_len);
 158         return scnprintf(buf, buflen, "\n");
 159 }
 160 __IEEE80211_IF_FILE(beacon_tail_len);
 161
 162 /* WDS attributes */
 163 IEEE80211_IF_FILE(peer, u.wds.remote_addr, MAC);
 164
 165 /* VLAN attributes */
 166 IEEE80211_IF_FILE(vlan_id, u.vlan.id, DEC);
 167
 168 /* MONITOR attributes */
 169 static ssize_t ieee80211_if_fmt_mode(
 170         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 171 {
 172         struct ieee80211_local *local = sdata->local;
 173
 174         return scnprintf(buf, buflen, "%s\n",
 175                          ((local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) ||
 176                           local->open_count == local->monitors) ?
 177                          "hard" : "soft");
 178 }
 179 __IEEE80211_IF_FILE(mode);
 180
 181
 182 #define DEBUGFS_ADD(name, type)\
 183         sdata->debugfs.type.name = debugfs_create_file(#name, 0444,\
 184                 sdata->debugfsdir, sdata, &name##_ops);
 185
 186 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 187 {
 188         DEBUGFS_ADD(channel_use, sta);
 189         DEBUGFS_ADD(drop_unencrypted, sta);
 190         DEBUGFS_ADD(eapol, sta);
 191         DEBUGFS_ADD(ieee8021_x, sta);
 192         DEBUGFS_ADD(state, sta);
 193         DEBUGFS_ADD(bssid, sta);
 194         DEBUGFS_ADD(prev_bssid, sta);
 195         DEBUGFS_ADD(ssid_len, sta);
 196         DEBUGFS_ADD(aid, sta);
 197         DEBUGFS_ADD(ap_capab, sta);
 198         DEBUGFS_ADD(capab, sta);
 199         DEBUGFS_ADD(extra_ie_len, sta);
 200         DEBUGFS_ADD(auth_tries, sta);
 201         DEBUGFS_ADD(assoc_tries, sta);
 202         DEBUGFS_ADD(auth_algs, sta);
 203         DEBUGFS_ADD(auth_alg, sta);
 204         DEBUGFS_ADD(auth_transaction, sta);
 205         DEBUGFS_ADD(flags, sta);
 206 }
 207
 208 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 209 {
 210         DEBUGFS_ADD(channel_use, ap);
 211         DEBUGFS_ADD(drop_unencrypted, ap);
 212         DEBUGFS_ADD(eapol, ap);
 213         DEBUGFS_ADD(ieee8021_x, ap);
 214         DEBUGFS_ADD(num_sta_ps, ap);
 215         DEBUGFS_ADD(dtim_period, ap);
 216         DEBUGFS_ADD(dtim_count, ap);
 217         DEBUGFS_ADD(num_beacons, ap);
 218         DEBUGFS_ADD(force_unicast_rateidx, ap);
 219         DEBUGFS_ADD(max_ratectrl_rateidx, ap);
 220         DEBUGFS_ADD(num_buffered_multicast, ap);
 221         DEBUGFS_ADD(beacon_head_len, ap);
 222         DEBUGFS_ADD(beacon_tail_len, ap);
 223 }
 224
 225 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 226 {
 227         DEBUGFS_ADD(channel_use, wds);
 228         DEBUGFS_ADD(drop_unencrypted, wds);
 229         DEBUGFS_ADD(eapol, wds);
 230         DEBUGFS_ADD(ieee8021_x, wds);
 231         DEBUGFS_ADD(peer, wds);
 232 }
 233
 234 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 235 {
 236         DEBUGFS_ADD(channel_use, vlan);
 237         DEBUGFS_ADD(drop_unencrypted, vlan);
 238         DEBUGFS_ADD(eapol, vlan);
 239         DEBUGFS_ADD(ieee8021_x, vlan);
 240         DEBUGFS_ADD(vlan_id, vlan);
 241 }
 242
 243 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 244 {
 245         DEBUGFS_ADD(mode, monitor);
 246 }
 247
 248 static void add_files(struct ieee80211_sub_if_data *sdata)
 249 {
 250         if (!sdata->debugfsdir)
 251                 return;
 252
 253         switch (sdata->type) {
 254         case IEEE80211_IF_TYPE_STA:
 255         case IEEE80211_IF_TYPE_IBSS:
 256                 add_sta_files(sdata);
 257                 break;
 258         case IEEE80211_IF_TYPE_AP:
 259                 add_ap_files(sdata);
 260                 break;
 261         case IEEE80211_IF_TYPE_WDS:
 262                 add_wds_files(sdata);
 263                 break;
 264         case IEEE80211_IF_TYPE_MNTR:
 265                 add_monitor_files(sdata);
 266                 break;
 267         case IEEE80211_IF_TYPE_VLAN:
 268                 add_vlan_files(sdata);
 269                 break;
 270         default:
 271                 break;
 272         }
 273 }
 274
 275 #define DEBUGFS_DEL(name, type)                                 \
 276         do {                                                    \
 277                 debugfs_remove(sdata->debugfs.type.name);       \
 278                 sdata->debugfs.type.name = NULL;                \
 279         } while (0)
 280
 281 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 282 {
 283         DEBUGFS_DEL(channel_use, sta);
 284         DEBUGFS_DEL(drop_unencrypted, sta);
 285         DEBUGFS_DEL(eapol, sta);
 286         DEBUGFS_DEL(ieee8021_x, sta);
 287         DEBUGFS_DEL(state, sta);
 288         DEBUGFS_DEL(bssid, sta);
 289         DEBUGFS_DEL(prev_bssid, sta);
 290         DEBUGFS_DEL(ssid_len, sta);
 291         DEBUGFS_DEL(aid, sta);
 292         DEBUGFS_DEL(ap_capab, sta);
 293         DEBUGFS_DEL(capab, sta);
 294         DEBUGFS_DEL(extra_ie_len, sta);
 295         DEBUGFS_DEL(auth_tries, sta);
 296         DEBUGFS_DEL(assoc_tries, sta);
 297         DEBUGFS_DEL(auth_algs, sta);
 298         DEBUGFS_DEL(auth_alg, sta);
 299         DEBUGFS_DEL(auth_transaction, sta);
 300         DEBUGFS_DEL(flags, sta);
 301 }
 302
 303 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 304 {
 305         DEBUGFS_DEL(channel_use, ap);
 306         DEBUGFS_DEL(drop_unencrypted, ap);
 307         DEBUGFS_DEL(eapol, ap);
 308         DEBUGFS_DEL(ieee8021_x, ap);
 309         DEBUGFS_DEL(num_sta_ps, ap);
 310         DEBUGFS_DEL(dtim_period, ap);
 311         DEBUGFS_DEL(dtim_count, ap);
 312         DEBUGFS_DEL(num_beacons, ap);
 313         DEBUGFS_DEL(force_unicast_rateidx, ap);
 314         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 315         DEBUGFS_DEL(num_buffered_multicast, ap);
 316         DEBUGFS_DEL(beacon_head_len, ap);
 317         DEBUGFS_DEL(beacon_tail_len, ap);
 318 }
 319
 320 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 321 {
 322         DEBUGFS_DEL(channel_use, wds);
 323         DEBUGFS_DEL(drop_unencrypted, wds);
 324         DEBUGFS_DEL(eapol, wds);
 325         DEBUGFS_DEL(ieee8021_x, wds);
 326         DEBUGFS_DEL(peer, wds);
 327 }
 328
 329 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 330 {
 331         DEBUGFS_DEL(channel_use, vlan);
 332         DEBUGFS_DEL(drop_unencrypted, vlan);
 333         DEBUGFS_DEL(eapol, vlan);
 334         DEBUGFS_DEL(ieee8021_x, vlan);
 335         DEBUGFS_DEL(vlan_id, vlan);
 336 }
 337
 338 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 339 {
 340         DEBUGFS_DEL(mode, monitor);
 341 }
 342
 343 static void del_files(struct ieee80211_sub_if_data *sdata, int type)
 344 {
 345         if (!sdata->debugfsdir)
 346                 return;
 347
 348         switch (type) {
 349         case IEEE80211_IF_TYPE_STA:
 350         case IEEE80211_IF_TYPE_IBSS:
 351                 del_sta_files(sdata);
 352                 break;
 353         case IEEE80211_IF_TYPE_AP:
 354                 del_ap_files(sdata);
 355                 break;
 356         case IEEE80211_IF_TYPE_WDS:
 357                 del_wds_files(sdata);
 358                 break;
 359         case IEEE80211_IF_TYPE_MNTR:
 360                 del_monitor_files(sdata);
 361                 break;
 362         case IEEE80211_IF_TYPE_VLAN:
 363                 del_vlan_files(sdata);
 364                 break;
 365         default:
 366                 break;
 367         }
 368 }
 369
 370 static int notif_registered;
 371
 372 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 373 {
 374         char buf[10+IFNAMSIZ];
 375
 376         if (!notif_registered)
 377                 return;
 378
 379         sprintf(buf, "netdev:%s", sdata->dev->name);
 380         sdata->debugfsdir = debugfs_create_dir(buf,
 381                 sdata->local->hw.wiphy->debugfsdir);
 382 }
 383
 384 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 385 {
 386         del_files(sdata, sdata->type);
 387         debugfs_remove(sdata->debugfsdir);
 388         sdata->debugfsdir = NULL;
 389 }
 390
 391 void ieee80211_debugfs_change_if_type(struct ieee80211_sub_if_data *sdata,
 392                                       int oldtype)
 393 {
 394         del_files(sdata, oldtype);
 395         add_files(sdata);
 396 }
 397
 398 static int netdev_notify(struct notifier_block * nb,
 399                          unsigned long state,
 400                          void *ndev)
 401 {
 402         struct net_device *dev = ndev;
 403         struct dentry *dir;
 404         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 405         char buf[10+IFNAMSIZ];
 406
 407         if (state != NETDEV_CHANGENAME)
 408                 return 0;
 409
 410         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 411                 return 0;
 412
 413         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 414                 return 0;
 415
 416         sprintf(buf, "netdev:%s", dev->name);
 417         dir = sdata->debugfsdir;
 418         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 419                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 420                        "dir to %s\n", buf);
 421
 422         return 0;
 423 }
 424
 425 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 426         .notifier_call = netdev_notify,
 427 };
 428
 429 void ieee80211_debugfs_netdev_init(void)
 430 {
 431         int err;
 432
 433         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 434         if (err) {
 435                 printk(KERN_ERR
 436                        "mac80211: failed to install netdev notifier,"
 437                        " disabling per-netdev debugfs!\n");
 438         } else
 439                 notif_registered = 1;
 440 }
 441
 442 void ieee80211_debugfs_netdev_exit(void)
 443 {
 444         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 445         notif_registered = 0;
 446 }