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 #define DEBUGFS_ADD(name, type)\
 166         sdata->debugfs.type.name = debugfs_create_file(#name, 0444,\
 167                 sdata->debugfsdir, sdata, &name##_ops);
 168
 169 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 170 {
 171         DEBUGFS_ADD(channel_use, sta);
 172         DEBUGFS_ADD(drop_unencrypted, sta);
 173         DEBUGFS_ADD(eapol, sta);
 174         DEBUGFS_ADD(ieee8021_x, sta);
 175         DEBUGFS_ADD(state, sta);
 176         DEBUGFS_ADD(bssid, sta);
 177         DEBUGFS_ADD(prev_bssid, sta);
 178         DEBUGFS_ADD(ssid_len, sta);
 179         DEBUGFS_ADD(aid, sta);
 180         DEBUGFS_ADD(ap_capab, sta);
 181         DEBUGFS_ADD(capab, sta);
 182         DEBUGFS_ADD(extra_ie_len, sta);
 183         DEBUGFS_ADD(auth_tries, sta);
 184         DEBUGFS_ADD(assoc_tries, sta);
 185         DEBUGFS_ADD(auth_algs, sta);
 186         DEBUGFS_ADD(auth_alg, sta);
 187         DEBUGFS_ADD(auth_transaction, sta);
 188         DEBUGFS_ADD(flags, sta);
 189 }
 190
 191 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 192 {
 193         DEBUGFS_ADD(channel_use, ap);
 194         DEBUGFS_ADD(drop_unencrypted, ap);
 195         DEBUGFS_ADD(eapol, ap);
 196         DEBUGFS_ADD(ieee8021_x, ap);
 197         DEBUGFS_ADD(num_sta_ps, ap);
 198         DEBUGFS_ADD(dtim_period, ap);
 199         DEBUGFS_ADD(dtim_count, ap);
 200         DEBUGFS_ADD(num_beacons, ap);
 201         DEBUGFS_ADD(force_unicast_rateidx, ap);
 202         DEBUGFS_ADD(max_ratectrl_rateidx, ap);
 203         DEBUGFS_ADD(num_buffered_multicast, ap);
 204         DEBUGFS_ADD(beacon_head_len, ap);
 205         DEBUGFS_ADD(beacon_tail_len, ap);
 206 }
 207
 208 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 209 {
 210         DEBUGFS_ADD(channel_use, wds);
 211         DEBUGFS_ADD(drop_unencrypted, wds);
 212         DEBUGFS_ADD(eapol, wds);
 213         DEBUGFS_ADD(ieee8021_x, wds);
 214         DEBUGFS_ADD(peer, wds);
 215 }
 216
 217 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 218 {
 219         DEBUGFS_ADD(channel_use, vlan);
 220         DEBUGFS_ADD(drop_unencrypted, vlan);
 221         DEBUGFS_ADD(eapol, vlan);
 222         DEBUGFS_ADD(ieee8021_x, vlan);
 223 }
 224
 225 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 226 {
 227 }
 228
 229 static void add_files(struct ieee80211_sub_if_data *sdata)
 230 {
 231         if (!sdata->debugfsdir)
 232                 return;
 233
 234         switch (sdata->type) {
 235         case IEEE80211_IF_TYPE_STA:
 236         case IEEE80211_IF_TYPE_IBSS:
 237                 add_sta_files(sdata);
 238                 break;
 239         case IEEE80211_IF_TYPE_AP:
 240                 add_ap_files(sdata);
 241                 break;
 242         case IEEE80211_IF_TYPE_WDS:
 243                 add_wds_files(sdata);
 244                 break;
 245         case IEEE80211_IF_TYPE_MNTR:
 246                 add_monitor_files(sdata);
 247                 break;
 248         case IEEE80211_IF_TYPE_VLAN:
 249                 add_vlan_files(sdata);
 250                 break;
 251         default:
 252                 break;
 253         }
 254 }
 255
 256 #define DEBUGFS_DEL(name, type)                                 \
 257         do {                                                    \
 258                 debugfs_remove(sdata->debugfs.type.name);       \
 259                 sdata->debugfs.type.name = NULL;                \
 260         } while (0)
 261
 262 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 263 {
 264         DEBUGFS_DEL(channel_use, sta);
 265         DEBUGFS_DEL(drop_unencrypted, sta);
 266         DEBUGFS_DEL(eapol, sta);
 267         DEBUGFS_DEL(ieee8021_x, sta);
 268         DEBUGFS_DEL(state, sta);
 269         DEBUGFS_DEL(bssid, sta);
 270         DEBUGFS_DEL(prev_bssid, sta);
 271         DEBUGFS_DEL(ssid_len, sta);
 272         DEBUGFS_DEL(aid, sta);
 273         DEBUGFS_DEL(ap_capab, sta);
 274         DEBUGFS_DEL(capab, sta);
 275         DEBUGFS_DEL(extra_ie_len, sta);
 276         DEBUGFS_DEL(auth_tries, sta);
 277         DEBUGFS_DEL(assoc_tries, sta);
 278         DEBUGFS_DEL(auth_algs, sta);
 279         DEBUGFS_DEL(auth_alg, sta);
 280         DEBUGFS_DEL(auth_transaction, sta);
 281         DEBUGFS_DEL(flags, sta);
 282 }
 283
 284 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 285 {
 286         DEBUGFS_DEL(channel_use, ap);
 287         DEBUGFS_DEL(drop_unencrypted, ap);
 288         DEBUGFS_DEL(eapol, ap);
 289         DEBUGFS_DEL(ieee8021_x, ap);
 290         DEBUGFS_DEL(num_sta_ps, ap);
 291         DEBUGFS_DEL(dtim_period, ap);
 292         DEBUGFS_DEL(dtim_count, ap);
 293         DEBUGFS_DEL(num_beacons, ap);
 294         DEBUGFS_DEL(force_unicast_rateidx, ap);
 295         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 296         DEBUGFS_DEL(num_buffered_multicast, ap);
 297         DEBUGFS_DEL(beacon_head_len, ap);
 298         DEBUGFS_DEL(beacon_tail_len, ap);
 299 }
 300
 301 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 302 {
 303         DEBUGFS_DEL(channel_use, wds);
 304         DEBUGFS_DEL(drop_unencrypted, wds);
 305         DEBUGFS_DEL(eapol, wds);
 306         DEBUGFS_DEL(ieee8021_x, wds);
 307         DEBUGFS_DEL(peer, wds);
 308 }
 309
 310 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 311 {
 312         DEBUGFS_DEL(channel_use, vlan);
 313         DEBUGFS_DEL(drop_unencrypted, vlan);
 314         DEBUGFS_DEL(eapol, vlan);
 315         DEBUGFS_DEL(ieee8021_x, vlan);
 316 }
 317
 318 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 319 {
 320 }
 321
 322 static void del_files(struct ieee80211_sub_if_data *sdata, int type)
 323 {
 324         if (!sdata->debugfsdir)
 325                 return;
 326
 327         switch (type) {
 328         case IEEE80211_IF_TYPE_STA:
 329         case IEEE80211_IF_TYPE_IBSS:
 330                 del_sta_files(sdata);
 331                 break;
 332         case IEEE80211_IF_TYPE_AP:
 333                 del_ap_files(sdata);
 334                 break;
 335         case IEEE80211_IF_TYPE_WDS:
 336                 del_wds_files(sdata);
 337                 break;
 338         case IEEE80211_IF_TYPE_MNTR:
 339                 del_monitor_files(sdata);
 340                 break;
 341         case IEEE80211_IF_TYPE_VLAN:
 342                 del_vlan_files(sdata);
 343                 break;
 344         default:
 345                 break;
 346         }
 347 }
 348
 349 static int notif_registered;
 350
 351 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 352 {
 353         char buf[10+IFNAMSIZ];
 354
 355         if (!notif_registered)
 356                 return;
 357
 358         sprintf(buf, "netdev:%s", sdata->dev->name);
 359         sdata->debugfsdir = debugfs_create_dir(buf,
 360                 sdata->local->hw.wiphy->debugfsdir);
 361 }
 362
 363 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 364 {
 365         del_files(sdata, sdata->type);
 366         debugfs_remove(sdata->debugfsdir);
 367         sdata->debugfsdir = NULL;
 368 }
 369
 370 void ieee80211_debugfs_change_if_type(struct ieee80211_sub_if_data *sdata,
 371                                       int oldtype)
 372 {
 373         del_files(sdata, oldtype);
 374         add_files(sdata);
 375 }
 376
 377 static int netdev_notify(struct notifier_block * nb,
 378                          unsigned long state,
 379                          void *ndev)
 380 {
 381         struct net_device *dev = ndev;
 382         struct dentry *dir;
 383         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 384         char buf[10+IFNAMSIZ];
 385
 386         if (state != NETDEV_CHANGENAME)
 387                 return 0;
 388
 389         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 390                 return 0;
 391
 392         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 393                 return 0;
 394
 395         sprintf(buf, "netdev:%s", dev->name);
 396         dir = sdata->debugfsdir;
 397         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 398                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 399                        "dir to %s\n", buf);
 400
 401         return 0;
 402 }
 403
 404 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 405         .notifier_call = netdev_notify,
 406 };
 407
 408 void ieee80211_debugfs_netdev_init(void)
 409 {
 410         int err;
 411
 412         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 413         if (err) {
 414                 printk(KERN_ERR
 415                        "mac80211: failed to install netdev notifier,"
 416                        " disabling per-netdev debugfs!\n");
 417         } else
 418                 notif_registered = 1;
 419 }
 420
 421 void ieee80211_debugfs_netdev_exit(void)
 422 {
 423         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 424         notif_registered = 0;
 425 }