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