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->bss_conf.use_cts_prot ? "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_count, u.ap.dtim_count, DEC);
 128 IEEE80211_IF_FILE(num_beacons, u.ap.num_beacons, DEC);
 129 IEEE80211_IF_FILE(force_unicast_rateidx, u.ap.force_unicast_rateidx, DEC);
 130 IEEE80211_IF_FILE(max_ratectrl_rateidx, u.ap.max_ratectrl_rateidx, DEC);
 131
 132 static ssize_t ieee80211_if_fmt_num_buffered_multicast(
 133         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 134 {
 135         return scnprintf(buf, buflen, "%u\n",
 136                          skb_queue_len(&sdata->u.ap.ps_bc_buf));
 137 }
 138 __IEEE80211_IF_FILE(num_buffered_multicast);
 139
 140 /* WDS attributes */
 141 IEEE80211_IF_FILE(peer, u.wds.remote_addr, MAC);
 142
 143 #define DEBUGFS_ADD(name, type)\
 144         sdata->debugfs.type.name = debugfs_create_file(#name, 0444,\
 145                 sdata->debugfsdir, sdata, &name##_ops);
 146
 147 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 148 {
 149         DEBUGFS_ADD(channel_use, sta);
 150         DEBUGFS_ADD(drop_unencrypted, sta);
 151         DEBUGFS_ADD(ieee802_1x_pac, sta);
 152         DEBUGFS_ADD(state, sta);
 153         DEBUGFS_ADD(bssid, sta);
 154         DEBUGFS_ADD(prev_bssid, sta);
 155         DEBUGFS_ADD(ssid_len, sta);
 156         DEBUGFS_ADD(aid, sta);
 157         DEBUGFS_ADD(ap_capab, sta);
 158         DEBUGFS_ADD(capab, sta);
 159         DEBUGFS_ADD(extra_ie_len, sta);
 160         DEBUGFS_ADD(auth_tries, sta);
 161         DEBUGFS_ADD(assoc_tries, sta);
 162         DEBUGFS_ADD(auth_algs, sta);
 163         DEBUGFS_ADD(auth_alg, sta);
 164         DEBUGFS_ADD(auth_transaction, sta);
 165         DEBUGFS_ADD(flags, sta);
 166 }
 167
 168 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 169 {
 170         DEBUGFS_ADD(channel_use, ap);
 171         DEBUGFS_ADD(drop_unencrypted, ap);
 172         DEBUGFS_ADD(ieee802_1x_pac, ap);
 173         DEBUGFS_ADD(num_sta_ps, ap);
 174         DEBUGFS_ADD(dtim_count, ap);
 175         DEBUGFS_ADD(num_beacons, ap);
 176         DEBUGFS_ADD(force_unicast_rateidx, ap);
 177         DEBUGFS_ADD(max_ratectrl_rateidx, ap);
 178         DEBUGFS_ADD(num_buffered_multicast, ap);
 179 }
 180
 181 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 182 {
 183         DEBUGFS_ADD(channel_use, wds);
 184         DEBUGFS_ADD(drop_unencrypted, wds);
 185         DEBUGFS_ADD(ieee802_1x_pac, wds);
 186         DEBUGFS_ADD(peer, wds);
 187 }
 188
 189 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 190 {
 191         DEBUGFS_ADD(channel_use, vlan);
 192         DEBUGFS_ADD(drop_unencrypted, vlan);
 193         DEBUGFS_ADD(ieee802_1x_pac, vlan);
 194 }
 195
 196 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 197 {
 198 }
 199
 200 static void add_files(struct ieee80211_sub_if_data *sdata)
 201 {
 202         if (!sdata->debugfsdir)
 203                 return;
 204
 205         switch (sdata->vif.type) {
 206         case IEEE80211_IF_TYPE_STA:
 207         case IEEE80211_IF_TYPE_IBSS:
 208                 add_sta_files(sdata);
 209                 break;
 210         case IEEE80211_IF_TYPE_AP:
 211                 add_ap_files(sdata);
 212                 break;
 213         case IEEE80211_IF_TYPE_WDS:
 214                 add_wds_files(sdata);
 215                 break;
 216         case IEEE80211_IF_TYPE_MNTR:
 217                 add_monitor_files(sdata);
 218                 break;
 219         case IEEE80211_IF_TYPE_VLAN:
 220                 add_vlan_files(sdata);
 221                 break;
 222         default:
 223                 break;
 224         }
 225 }
 226
 227 #define DEBUGFS_DEL(name, type)                                 \
 228         do {                                                    \
 229                 debugfs_remove(sdata->debugfs.type.name);       \
 230                 sdata->debugfs.type.name = NULL;                \
 231         } while (0)
 232
 233 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 234 {
 235         DEBUGFS_DEL(channel_use, sta);
 236         DEBUGFS_DEL(drop_unencrypted, sta);
 237         DEBUGFS_DEL(ieee802_1x_pac, sta);
 238         DEBUGFS_DEL(state, sta);
 239         DEBUGFS_DEL(bssid, sta);
 240         DEBUGFS_DEL(prev_bssid, sta);
 241         DEBUGFS_DEL(ssid_len, sta);
 242         DEBUGFS_DEL(aid, sta);
 243         DEBUGFS_DEL(ap_capab, sta);
 244         DEBUGFS_DEL(capab, sta);
 245         DEBUGFS_DEL(extra_ie_len, sta);
 246         DEBUGFS_DEL(auth_tries, sta);
 247         DEBUGFS_DEL(assoc_tries, sta);
 248         DEBUGFS_DEL(auth_algs, sta);
 249         DEBUGFS_DEL(auth_alg, sta);
 250         DEBUGFS_DEL(auth_transaction, sta);
 251         DEBUGFS_DEL(flags, sta);
 252 }
 253
 254 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 255 {
 256         DEBUGFS_DEL(channel_use, ap);
 257         DEBUGFS_DEL(drop_unencrypted, ap);
 258         DEBUGFS_DEL(ieee802_1x_pac, ap);
 259         DEBUGFS_DEL(num_sta_ps, ap);
 260         DEBUGFS_DEL(dtim_count, ap);
 261         DEBUGFS_DEL(num_beacons, ap);
 262         DEBUGFS_DEL(force_unicast_rateidx, ap);
 263         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 264         DEBUGFS_DEL(num_buffered_multicast, ap);
 265 }
 266
 267 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 268 {
 269         DEBUGFS_DEL(channel_use, wds);
 270         DEBUGFS_DEL(drop_unencrypted, wds);
 271         DEBUGFS_DEL(ieee802_1x_pac, wds);
 272         DEBUGFS_DEL(peer, wds);
 273 }
 274
 275 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 276 {
 277         DEBUGFS_DEL(channel_use, vlan);
 278         DEBUGFS_DEL(drop_unencrypted, vlan);
 279         DEBUGFS_DEL(ieee802_1x_pac, vlan);
 280 }
 281
 282 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 283 {
 284 }
 285
 286 static void del_files(struct ieee80211_sub_if_data *sdata, int type)
 287 {
 288         if (!sdata->debugfsdir)
 289                 return;
 290
 291         switch (type) {
 292         case IEEE80211_IF_TYPE_STA:
 293         case IEEE80211_IF_TYPE_IBSS:
 294                 del_sta_files(sdata);
 295                 break;
 296         case IEEE80211_IF_TYPE_AP:
 297                 del_ap_files(sdata);
 298                 break;
 299         case IEEE80211_IF_TYPE_WDS:
 300                 del_wds_files(sdata);
 301                 break;
 302         case IEEE80211_IF_TYPE_MNTR:
 303                 del_monitor_files(sdata);
 304                 break;
 305         case IEEE80211_IF_TYPE_VLAN:
 306                 del_vlan_files(sdata);
 307                 break;
 308         default:
 309                 break;
 310         }
 311 }
 312
 313 static int notif_registered;
 314
 315 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 316 {
 317         char buf[10+IFNAMSIZ];
 318
 319         if (!notif_registered)
 320                 return;
 321
 322         sprintf(buf, "netdev:%s", sdata->dev->name);
 323         sdata->debugfsdir = debugfs_create_dir(buf,
 324                 sdata->local->hw.wiphy->debugfsdir);
 325 }
 326
 327 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 328 {
 329         del_files(sdata, sdata->vif.type);
 330         debugfs_remove(sdata->debugfsdir);
 331         sdata->debugfsdir = NULL;
 332 }
 333
 334 void ieee80211_debugfs_change_if_type(struct ieee80211_sub_if_data *sdata,
 335                                       int oldtype)
 336 {
 337         del_files(sdata, oldtype);
 338         add_files(sdata);
 339 }
 340
 341 static int netdev_notify(struct notifier_block * nb,
 342                          unsigned long state,
 343                          void *ndev)
 344 {
 345         struct net_device *dev = ndev;
 346         struct dentry *dir;
 347         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 348         char buf[10+IFNAMSIZ];
 349
 350         if (state != NETDEV_CHANGENAME)
 351                 return 0;
 352
 353         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 354                 return 0;
 355
 356         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 357                 return 0;
 358
 359         sprintf(buf, "netdev:%s", dev->name);
 360         dir = sdata->debugfsdir;
 361         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 362                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 363                        "dir to %s\n", buf);
 364
 365         return 0;
 366 }
 367
 368 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 369         .notifier_call = netdev_notify,
 370 };
 371
 372 void ieee80211_debugfs_netdev_init(void)
 373 {
 374         int err;
 375
 376         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 377         if (err) {
 378                 printk(KERN_ERR
 379                        "mac80211: failed to install netdev notifier,"
 380                        " disabling per-netdev debugfs!\n");
 381         } else
 382                 notif_registered = 1;
 383 }
 384
 385 void ieee80211_debugfs_netdev_exit(void)
 386 {
 387         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 388         notif_registered = 0;
 389 }