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(ieee802_1x_pac, ieee802_1x_pac, 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.flags & IEEE80211_STA_SSID_SET ? "SSID\n" : "",
 116                  sdata->u.sta.flags & IEEE80211_STA_BSSID_SET ? "BSSID\n" : "",
 117                  sdata->u.sta.flags & IEEE80211_STA_PREV_BSSID_SET ? "prev BSSID\n" : "",
 118                  sdata->u.sta.flags & IEEE80211_STA_AUTHENTICATED ? "AUTH\n" : "",
 119                  sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED ? "ASSOC\n" : "",
 120                  sdata->u.sta.flags & IEEE80211_STA_PROBEREQ_POLL ? "PROBEREQ POLL\n" : "",
 121                  sdata->flags & IEEE80211_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 #define DEBUGFS_ADD(name, type)\
 165         sdata->debugfs.type.name = debugfs_create_file(#name, 0444,\
 166                 sdata->debugfsdir, sdata, &name##_ops);
 167
 168 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 169 {
 170         DEBUGFS_ADD(channel_use, sta);
 171         DEBUGFS_ADD(drop_unencrypted, sta);
 172         DEBUGFS_ADD(ieee802_1x_pac, sta);
 173         DEBUGFS_ADD(state, sta);
 174         DEBUGFS_ADD(bssid, sta);
 175         DEBUGFS_ADD(prev_bssid, sta);
 176         DEBUGFS_ADD(ssid_len, sta);
 177         DEBUGFS_ADD(aid, sta);
 178         DEBUGFS_ADD(ap_capab, sta);
 179         DEBUGFS_ADD(capab, sta);
 180         DEBUGFS_ADD(extra_ie_len, sta);
 181         DEBUGFS_ADD(auth_tries, sta);
 182         DEBUGFS_ADD(assoc_tries, sta);
 183         DEBUGFS_ADD(auth_algs, sta);
 184         DEBUGFS_ADD(auth_alg, sta);
 185         DEBUGFS_ADD(auth_transaction, sta);
 186         DEBUGFS_ADD(flags, sta);
 187 }
 188
 189 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 190 {
 191         DEBUGFS_ADD(channel_use, ap);
 192         DEBUGFS_ADD(drop_unencrypted, ap);
 193         DEBUGFS_ADD(ieee802_1x_pac, ap);
 194         DEBUGFS_ADD(num_sta_ps, ap);
 195         DEBUGFS_ADD(dtim_period, ap);
 196         DEBUGFS_ADD(dtim_count, ap);
 197         DEBUGFS_ADD(num_beacons, ap);
 198         DEBUGFS_ADD(force_unicast_rateidx, ap);
 199         DEBUGFS_ADD(max_ratectrl_rateidx, ap);
 200         DEBUGFS_ADD(num_buffered_multicast, ap);
 201         DEBUGFS_ADD(beacon_head_len, ap);
 202         DEBUGFS_ADD(beacon_tail_len, ap);
 203 }
 204
 205 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 206 {
 207         DEBUGFS_ADD(channel_use, wds);
 208         DEBUGFS_ADD(drop_unencrypted, wds);
 209         DEBUGFS_ADD(ieee802_1x_pac, wds);
 210         DEBUGFS_ADD(peer, wds);
 211 }
 212
 213 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 214 {
 215         DEBUGFS_ADD(channel_use, vlan);
 216         DEBUGFS_ADD(drop_unencrypted, vlan);
 217         DEBUGFS_ADD(ieee802_1x_pac, vlan);
 218 }
 219
 220 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 221 {
 222 }
 223
 224 static void add_files(struct ieee80211_sub_if_data *sdata)
 225 {
 226         if (!sdata->debugfsdir)
 227                 return;
 228
 229         switch (sdata->type) {
 230         case IEEE80211_IF_TYPE_STA:
 231         case IEEE80211_IF_TYPE_IBSS:
 232                 add_sta_files(sdata);
 233                 break;
 234         case IEEE80211_IF_TYPE_AP:
 235                 add_ap_files(sdata);
 236                 break;
 237         case IEEE80211_IF_TYPE_WDS:
 238                 add_wds_files(sdata);
 239                 break;
 240         case IEEE80211_IF_TYPE_MNTR:
 241                 add_monitor_files(sdata);
 242                 break;
 243         case IEEE80211_IF_TYPE_VLAN:
 244                 add_vlan_files(sdata);
 245                 break;
 246         default:
 247                 break;
 248         }
 249 }
 250
 251 #define DEBUGFS_DEL(name, type)                                 \
 252         do {                                                    \
 253                 debugfs_remove(sdata->debugfs.type.name);       \
 254                 sdata->debugfs.type.name = NULL;                \
 255         } while (0)
 256
 257 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 258 {
 259         DEBUGFS_DEL(channel_use, sta);
 260         DEBUGFS_DEL(drop_unencrypted, sta);
 261         DEBUGFS_DEL(ieee802_1x_pac, sta);
 262         DEBUGFS_DEL(state, sta);
 263         DEBUGFS_DEL(bssid, sta);
 264         DEBUGFS_DEL(prev_bssid, sta);
 265         DEBUGFS_DEL(ssid_len, sta);
 266         DEBUGFS_DEL(aid, sta);
 267         DEBUGFS_DEL(ap_capab, sta);
 268         DEBUGFS_DEL(capab, sta);
 269         DEBUGFS_DEL(extra_ie_len, sta);
 270         DEBUGFS_DEL(auth_tries, sta);
 271         DEBUGFS_DEL(assoc_tries, sta);
 272         DEBUGFS_DEL(auth_algs, sta);
 273         DEBUGFS_DEL(auth_alg, sta);
 274         DEBUGFS_DEL(auth_transaction, sta);
 275         DEBUGFS_DEL(flags, sta);
 276 }
 277
 278 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 279 {
 280         DEBUGFS_DEL(channel_use, ap);
 281         DEBUGFS_DEL(drop_unencrypted, ap);
 282         DEBUGFS_DEL(ieee802_1x_pac, ap);
 283         DEBUGFS_DEL(num_sta_ps, ap);
 284         DEBUGFS_DEL(dtim_period, ap);
 285         DEBUGFS_DEL(dtim_count, ap);
 286         DEBUGFS_DEL(num_beacons, ap);
 287         DEBUGFS_DEL(force_unicast_rateidx, ap);
 288         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 289         DEBUGFS_DEL(num_buffered_multicast, ap);
 290         DEBUGFS_DEL(beacon_head_len, ap);
 291         DEBUGFS_DEL(beacon_tail_len, ap);
 292 }
 293
 294 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 295 {
 296         DEBUGFS_DEL(channel_use, wds);
 297         DEBUGFS_DEL(drop_unencrypted, wds);
 298         DEBUGFS_DEL(ieee802_1x_pac, wds);
 299         DEBUGFS_DEL(peer, wds);
 300 }
 301
 302 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 303 {
 304         DEBUGFS_DEL(channel_use, vlan);
 305         DEBUGFS_DEL(drop_unencrypted, vlan);
 306         DEBUGFS_DEL(ieee802_1x_pac, vlan);
 307 }
 308
 309 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 310 {
 311 }
 312
 313 static void del_files(struct ieee80211_sub_if_data *sdata, int type)
 314 {
 315         if (!sdata->debugfsdir)
 316                 return;
 317
 318         switch (type) {
 319         case IEEE80211_IF_TYPE_STA:
 320         case IEEE80211_IF_TYPE_IBSS:
 321                 del_sta_files(sdata);
 322                 break;
 323         case IEEE80211_IF_TYPE_AP:
 324                 del_ap_files(sdata);
 325                 break;
 326         case IEEE80211_IF_TYPE_WDS:
 327                 del_wds_files(sdata);
 328                 break;
 329         case IEEE80211_IF_TYPE_MNTR:
 330                 del_monitor_files(sdata);
 331                 break;
 332         case IEEE80211_IF_TYPE_VLAN:
 333                 del_vlan_files(sdata);
 334                 break;
 335         default:
 336                 break;
 337         }
 338 }
 339
 340 static int notif_registered;
 341
 342 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 343 {
 344         char buf[10+IFNAMSIZ];
 345
 346         if (!notif_registered)
 347                 return;
 348
 349         sprintf(buf, "netdev:%s", sdata->dev->name);
 350         sdata->debugfsdir = debugfs_create_dir(buf,
 351                 sdata->local->hw.wiphy->debugfsdir);
 352 }
 353
 354 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 355 {
 356         del_files(sdata, sdata->type);
 357         debugfs_remove(sdata->debugfsdir);
 358         sdata->debugfsdir = NULL;
 359 }
 360
 361 void ieee80211_debugfs_change_if_type(struct ieee80211_sub_if_data *sdata,
 362                                       int oldtype)
 363 {
 364         del_files(sdata, oldtype);
 365         add_files(sdata);
 366 }
 367
 368 static int netdev_notify(struct notifier_block * nb,
 369                          unsigned long state,
 370                          void *ndev)
 371 {
 372         struct net_device *dev = ndev;
 373         struct dentry *dir;
 374         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 375         char buf[10+IFNAMSIZ];
 376
 377         if (state != NETDEV_CHANGENAME)
 378                 return 0;
 379
 380         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 381                 return 0;
 382
 383         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 384                 return 0;
 385
 386         sprintf(buf, "netdev:%s", dev->name);
 387         dir = sdata->debugfsdir;
 388         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 389                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 390                        "dir to %s\n", buf);
 391
 392         return 0;
 393 }
 394
 395 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 396         .notifier_call = netdev_notify,
 397 };
 398
 399 void ieee80211_debugfs_netdev_init(void)
 400 {
 401         int err;
 402
 403         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 404         if (err) {
 405                 printk(KERN_ERR
 406                        "mac80211: failed to install netdev notifier,"
 407                        " disabling per-netdev debugfs!\n");
 408         } else
 409                 notif_registered = 1;
 410 }
 411
 412 void ieee80211_debugfs_netdev_exit(void)
 413 {
 414         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 415         notif_registered = 0;
 416 }