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
  95 /* STA/IBSS attributes */
  96 IEEE80211_IF_FILE(state, u.sta.state, DEC);
  97 IEEE80211_IF_FILE(bssid, u.sta.bssid, MAC);
  98 IEEE80211_IF_FILE(prev_bssid, u.sta.prev_bssid, MAC);
  99 IEEE80211_IF_FILE(ssid_len, u.sta.ssid_len, SIZE);
 100 IEEE80211_IF_FILE(aid, u.sta.aid, DEC);
 101 IEEE80211_IF_FILE(ap_capab, u.sta.ap_capab, HEX);
 102 IEEE80211_IF_FILE(capab, u.sta.capab, HEX);
 103 IEEE80211_IF_FILE(extra_ie_len, u.sta.extra_ie_len, SIZE);
 104 IEEE80211_IF_FILE(auth_tries, u.sta.auth_tries, DEC);
 105 IEEE80211_IF_FILE(assoc_tries, u.sta.assoc_tries, DEC);
 106 IEEE80211_IF_FILE(auth_algs, u.sta.auth_algs, HEX);
 107 IEEE80211_IF_FILE(auth_alg, u.sta.auth_alg, DEC);
 108 IEEE80211_IF_FILE(auth_transaction, u.sta.auth_transaction, DEC);
 109
 110 static ssize_t ieee80211_if_fmt_flags(
 111         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 112 {
 113         return scnprintf(buf, buflen, "%s%s%s%s%s%s%s\n",
 114                  sdata->u.sta.flags & IEEE80211_STA_SSID_SET ? "SSID\n" : "",
 115                  sdata->u.sta.flags & IEEE80211_STA_BSSID_SET ? "BSSID\n" : "",
 116                  sdata->u.sta.flags & IEEE80211_STA_PREV_BSSID_SET ? "prev BSSID\n" : "",
 117                  sdata->u.sta.flags & IEEE80211_STA_AUTHENTICATED ? "AUTH\n" : "",
 118                  sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED ? "ASSOC\n" : "",
 119                  sdata->u.sta.flags & IEEE80211_STA_PROBEREQ_POLL ? "PROBEREQ POLL\n" : "",
 120                  sdata->bss_conf.use_cts_prot ? "CTS prot\n" : "");
 121 }
 122 __IEEE80211_IF_FILE(flags);
 123
 124 /* AP attributes */
 125 IEEE80211_IF_FILE(num_sta_ps, u.ap.num_sta_ps, ATOMIC);
 126 IEEE80211_IF_FILE(dtim_count, u.ap.dtim_count, DEC);
 127 IEEE80211_IF_FILE(num_beacons, u.ap.num_beacons, DEC);
 128 IEEE80211_IF_FILE(force_unicast_rateidx, u.ap.force_unicast_rateidx, DEC);
 129 IEEE80211_IF_FILE(max_ratectrl_rateidx, u.ap.max_ratectrl_rateidx, DEC);
 130
 131 static ssize_t ieee80211_if_fmt_num_buffered_multicast(
 132         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 133 {
 134         return scnprintf(buf, buflen, "%u\n",
 135                          skb_queue_len(&sdata->u.ap.ps_bc_buf));
 136 }
 137 __IEEE80211_IF_FILE(num_buffered_multicast);
 138
 139 /* WDS attributes */
 140 IEEE80211_IF_FILE(peer, u.wds.remote_addr, MAC);
 141
 142 #define DEBUGFS_ADD(name, type)\
 143         sdata->debugfs.type.name = debugfs_create_file(#name, 0444,\
 144                 sdata->debugfsdir, sdata, &name##_ops);
 145
 146 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 147 {
 148         DEBUGFS_ADD(channel_use, sta);
 149         DEBUGFS_ADD(drop_unencrypted, sta);
 150         DEBUGFS_ADD(state, sta);
 151         DEBUGFS_ADD(bssid, sta);
 152         DEBUGFS_ADD(prev_bssid, sta);
 153         DEBUGFS_ADD(ssid_len, sta);
 154         DEBUGFS_ADD(aid, sta);
 155         DEBUGFS_ADD(ap_capab, sta);
 156         DEBUGFS_ADD(capab, sta);
 157         DEBUGFS_ADD(extra_ie_len, sta);
 158         DEBUGFS_ADD(auth_tries, sta);
 159         DEBUGFS_ADD(assoc_tries, sta);
 160         DEBUGFS_ADD(auth_algs, sta);
 161         DEBUGFS_ADD(auth_alg, sta);
 162         DEBUGFS_ADD(auth_transaction, sta);
 163         DEBUGFS_ADD(flags, sta);
 164 }
 165
 166 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 167 {
 168         DEBUGFS_ADD(channel_use, ap);
 169         DEBUGFS_ADD(drop_unencrypted, ap);
 170         DEBUGFS_ADD(num_sta_ps, ap);
 171         DEBUGFS_ADD(dtim_count, ap);
 172         DEBUGFS_ADD(num_beacons, ap);
 173         DEBUGFS_ADD(force_unicast_rateidx, ap);
 174         DEBUGFS_ADD(max_ratectrl_rateidx, ap);
 175         DEBUGFS_ADD(num_buffered_multicast, ap);
 176 }
 177
 178 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 179 {
 180         DEBUGFS_ADD(channel_use, wds);
 181         DEBUGFS_ADD(drop_unencrypted, wds);
 182         DEBUGFS_ADD(peer, wds);
 183 }
 184
 185 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 186 {
 187         DEBUGFS_ADD(channel_use, vlan);
 188         DEBUGFS_ADD(drop_unencrypted, vlan);
 189 }
 190
 191 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 192 {
 193 }
 194
 195 static void add_files(struct ieee80211_sub_if_data *sdata)
 196 {
 197         if (!sdata->debugfsdir)
 198                 return;
 199
 200         switch (sdata->vif.type) {
 201         case IEEE80211_IF_TYPE_STA:
 202         case IEEE80211_IF_TYPE_IBSS:
 203                 add_sta_files(sdata);
 204                 break;
 205         case IEEE80211_IF_TYPE_AP:
 206                 add_ap_files(sdata);
 207                 break;
 208         case IEEE80211_IF_TYPE_WDS:
 209                 add_wds_files(sdata);
 210                 break;
 211         case IEEE80211_IF_TYPE_MNTR:
 212                 add_monitor_files(sdata);
 213                 break;
 214         case IEEE80211_IF_TYPE_VLAN:
 215                 add_vlan_files(sdata);
 216                 break;
 217         default:
 218                 break;
 219         }
 220 }
 221
 222 #define DEBUGFS_DEL(name, type)                                 \
 223         do {                                                    \
 224                 debugfs_remove(sdata->debugfs.type.name);       \
 225                 sdata->debugfs.type.name = NULL;                \
 226         } while (0)
 227
 228 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 229 {
 230         DEBUGFS_DEL(channel_use, sta);
 231         DEBUGFS_DEL(drop_unencrypted, sta);
 232         DEBUGFS_DEL(state, sta);
 233         DEBUGFS_DEL(bssid, sta);
 234         DEBUGFS_DEL(prev_bssid, sta);
 235         DEBUGFS_DEL(ssid_len, sta);
 236         DEBUGFS_DEL(aid, sta);
 237         DEBUGFS_DEL(ap_capab, sta);
 238         DEBUGFS_DEL(capab, sta);
 239         DEBUGFS_DEL(extra_ie_len, sta);
 240         DEBUGFS_DEL(auth_tries, sta);
 241         DEBUGFS_DEL(assoc_tries, sta);
 242         DEBUGFS_DEL(auth_algs, sta);
 243         DEBUGFS_DEL(auth_alg, sta);
 244         DEBUGFS_DEL(auth_transaction, sta);
 245         DEBUGFS_DEL(flags, sta);
 246 }
 247
 248 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 249 {
 250         DEBUGFS_DEL(channel_use, ap);
 251         DEBUGFS_DEL(drop_unencrypted, ap);
 252         DEBUGFS_DEL(num_sta_ps, ap);
 253         DEBUGFS_DEL(dtim_count, ap);
 254         DEBUGFS_DEL(num_beacons, ap);
 255         DEBUGFS_DEL(force_unicast_rateidx, ap);
 256         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 257         DEBUGFS_DEL(num_buffered_multicast, ap);
 258 }
 259
 260 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 261 {
 262         DEBUGFS_DEL(channel_use, wds);
 263         DEBUGFS_DEL(drop_unencrypted, wds);
 264         DEBUGFS_DEL(peer, wds);
 265 }
 266
 267 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 268 {
 269         DEBUGFS_DEL(channel_use, vlan);
 270         DEBUGFS_DEL(drop_unencrypted, vlan);
 271 }
 272
 273 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 274 {
 275 }
 276
 277 static void del_files(struct ieee80211_sub_if_data *sdata, int type)
 278 {
 279         if (!sdata->debugfsdir)
 280                 return;
 281
 282         switch (type) {
 283         case IEEE80211_IF_TYPE_STA:
 284         case IEEE80211_IF_TYPE_IBSS:
 285                 del_sta_files(sdata);
 286                 break;
 287         case IEEE80211_IF_TYPE_AP:
 288                 del_ap_files(sdata);
 289                 break;
 290         case IEEE80211_IF_TYPE_WDS:
 291                 del_wds_files(sdata);
 292                 break;
 293         case IEEE80211_IF_TYPE_MNTR:
 294                 del_monitor_files(sdata);
 295                 break;
 296         case IEEE80211_IF_TYPE_VLAN:
 297                 del_vlan_files(sdata);
 298                 break;
 299         default:
 300                 break;
 301         }
 302 }
 303
 304 static int notif_registered;
 305
 306 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 307 {
 308         char buf[10+IFNAMSIZ];
 309
 310         if (!notif_registered)
 311                 return;
 312
 313         sprintf(buf, "netdev:%s", sdata->dev->name);
 314         sdata->debugfsdir = debugfs_create_dir(buf,
 315                 sdata->local->hw.wiphy->debugfsdir);
 316 }
 317
 318 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 319 {
 320         del_files(sdata, sdata->vif.type);
 321         debugfs_remove(sdata->debugfsdir);
 322         sdata->debugfsdir = NULL;
 323 }
 324
 325 void ieee80211_debugfs_change_if_type(struct ieee80211_sub_if_data *sdata,
 326                                       int oldtype)
 327 {
 328         del_files(sdata, oldtype);
 329         add_files(sdata);
 330 }
 331
 332 static int netdev_notify(struct notifier_block * nb,
 333                          unsigned long state,
 334                          void *ndev)
 335 {
 336         struct net_device *dev = ndev;
 337         struct dentry *dir;
 338         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 339         char buf[10+IFNAMSIZ];
 340
 341         if (state != NETDEV_CHANGENAME)
 342                 return 0;
 343
 344         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 345                 return 0;
 346
 347         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 348                 return 0;
 349
 350         sprintf(buf, "netdev:%s", dev->name);
 351         dir = sdata->debugfsdir;
 352         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 353                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 354                        "dir to %s\n", buf);
 355
 356         return 0;
 357 }
 358
 359 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 360         .notifier_call = netdev_notify,
 361 };
 362
 363 void ieee80211_debugfs_netdev_init(void)
 364 {
 365         int err;
 366
 367         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 368         if (err) {
 369                 printk(KERN_ERR
 370                        "mac80211: failed to install netdev notifier,"
 371                        " disabling per-netdev debugfs!\n");
 372         } else
 373                 notif_registered = 1;
 374 }
 375
 376 void ieee80211_debugfs_netdev_exit(void)
 377 {
 378         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 379         notif_registered = 0;
 380 }