net/mac80211/debugfs_sta.c

   1 /*
   2  * Copyright 2003-2005  Devicescape Software, Inc.
   3  * Copyright (c) 2006   Jiri Benc <jbenc@suse.cz>
   4  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/debugfs.h>
  12 #include <linux/ieee80211.h>
  13 #include "ieee80211_i.h"
  14 #include "debugfs.h"
  15 #include "debugfs_sta.h"
  16 #include "sta_info.h"
  17
  18 /* sta attributtes */
  19
  20 #define STA_READ(name, field, format_string)                            \
  21 static ssize_t sta_ ##name## _read(struct file *file,                   \
  22                                    char __user *userbuf,                \
  23                                    size_t count, loff_t *ppos)          \
  24 {                                                                       \
  25         struct sta_info *sta = file->private_data;                      \
  26         return mac80211_format_buffer(userbuf, count, ppos,             \
  27                                       format_string, sta->field);       \
  28 }
  29 #define STA_READ_D(name, field) STA_READ(name, field, "%d\n")
  30 #define STA_READ_U(name, field) STA_READ(name, field, "%u\n")
  31 #define STA_READ_S(name, field) STA_READ(name, field, "%s\n")
  32
  33 #define STA_OPS(name)                                                   \
  34 static const struct file_operations sta_ ##name## _ops = {              \
  35         .read = sta_##name##_read,                                      \
  36         .open = mac80211_open_file_generic,                             \
  37         .llseek = generic_file_llseek,                                  \
  38 }
  39
  40 #define STA_OPS_RW(name)                                                \
  41 static const struct file_operations sta_ ##name## _ops = {              \
  42         .read = sta_##name##_read,                                      \
  43         .write = sta_##name##_write,                                    \
  44         .open = mac80211_open_file_generic,                             \
  45         .llseek = generic_file_llseek,                                  \
  46 }
  47
  48 #define STA_FILE(name, field, format)                                   \
  49                 STA_READ_##format(name, field)                          \
  50                 STA_OPS(name)
  51
  52 STA_FILE(aid, sta.aid, D);
  53 STA_FILE(dev, sdata->name, S);
  54 STA_FILE(last_signal, last_signal, D);
  55
  56 static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
  57                               size_t count, loff_t *ppos)
  58 {
  59         char buf[100];
  60         struct sta_info *sta = file->private_data;
  61         u32 staflags = get_sta_flags(sta);
  62         int res = scnprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s",
  63                 staflags & WLAN_STA_AUTH ? "AUTH\n" : "",
  64                 staflags & WLAN_STA_ASSOC ? "ASSOC\n" : "",
  65                 staflags & WLAN_STA_PS_STA ? "PS (sta)\n" : "",
  66                 staflags & WLAN_STA_PS_DRIVER ? "PS (driver)\n" : "",
  67                 staflags & WLAN_STA_AUTHORIZED ? "AUTHORIZED\n" : "",
  68                 staflags & WLAN_STA_SHORT_PREAMBLE ? "SHORT PREAMBLE\n" : "",
  69                 staflags & WLAN_STA_WME ? "WME\n" : "",
  70                 staflags & WLAN_STA_WDS ? "WDS\n" : "",
  71                 staflags & WLAN_STA_MFP ? "MFP\n" : "");
  72         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  73 }
  74 STA_OPS(flags);
  75
  76 static ssize_t sta_num_ps_buf_frames_read(struct file *file,
  77                                           char __user *userbuf,
  78                                           size_t count, loff_t *ppos)
  79 {
  80         struct sta_info *sta = file->private_data;
  81         return mac80211_format_buffer(userbuf, count, ppos, "%u\n",
  82                                       skb_queue_len(&sta->ps_tx_buf));
  83 }
  84 STA_OPS(num_ps_buf_frames);
  85
  86 static ssize_t sta_inactive_ms_read(struct file *file, char __user *userbuf,
  87                                     size_t count, loff_t *ppos)
  88 {
  89         struct sta_info *sta = file->private_data;
  90         return mac80211_format_buffer(userbuf, count, ppos, "%d\n",
  91                                       jiffies_to_msecs(jiffies - sta->last_rx));
  92 }
  93 STA_OPS(inactive_ms);
  94
  95 static ssize_t sta_last_seq_ctrl_read(struct file *file, char __user *userbuf,
  96                                       size_t count, loff_t *ppos)
  97 {
  98         char buf[15*NUM_RX_DATA_QUEUES], *p = buf;
  99         int i;
 100         struct sta_info *sta = file->private_data;
 101         for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 102                 p += scnprintf(p, sizeof(buf)+buf-p, "%x ",
 103                                le16_to_cpu(sta->last_seq_ctrl[i]));
 104         p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 105         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 106 }
 107 STA_OPS(last_seq_ctrl);
 108
 109 static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
 110                                         size_t count, loff_t *ppos)
 111 {
 112         char buf[71 + STA_TID_NUM * 40], *p = buf;
 113         int i;
 114         struct sta_info *sta = file->private_data;
 115         struct tid_ampdu_rx *tid_rx;
 116         struct tid_ampdu_tx *tid_tx;
 117
 118         rcu_read_lock();
 119
 120         p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
 121                         sta->ampdu_mlme.dialog_token_allocator + 1);
 122         p += scnprintf(p, sizeof(buf) + buf - p,
 123                        "TID\t\tRX active\tDTKN\tSSN\t\tTX\tDTKN\tpending\n");
 124
 125         for (i = 0; i < STA_TID_NUM; i++) {
 126                 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[i]);
 127                 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[i]);
 128
 129                 p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
 130                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_rx);
 131                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 132                                 tid_rx ? tid_rx->dialog_token : 0);
 133                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
 134                                 tid_rx ? tid_rx->ssn : 0);
 135
 136                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_tx);
 137                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 138                                 tid_tx ? tid_tx->dialog_token : 0);
 139                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
 140                                 tid_tx ? skb_queue_len(&tid_tx->pending) : 0);
 141                 p += scnprintf(p, sizeof(buf) + buf - p, "\n");
 142         }
 143         rcu_read_unlock();
 144
 145         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 146 }
 147
 148 static ssize_t sta_agg_status_write(struct file *file, const char __user *userbuf,
 149                                     size_t count, loff_t *ppos)
 150 {
 151         char _buf[12], *buf = _buf;
 152         struct sta_info *sta = file->private_data;
 153         bool start, tx;
 154         unsigned long tid;
 155         int ret;
 156
 157         if (count > sizeof(_buf))
 158                 return -EINVAL;
 159
 160         if (copy_from_user(buf, userbuf, count))
 161                 return -EFAULT;
 162
 163         buf[sizeof(_buf) - 1] = '\0';
 164
 165         if (strncmp(buf, "tx ", 3) == 0) {
 166                 buf += 3;
 167                 tx = true;
 168         } else if (strncmp(buf, "rx ", 3) == 0) {
 169                 buf += 3;
 170                 tx = false;
 171         } else
 172                 return -EINVAL;
 173
 174         if (strncmp(buf, "start ", 6) == 0) {
 175                 buf += 6;
 176                 start = true;
 177                 if (!tx)
 178                         return -EINVAL;
 179         } else if (strncmp(buf, "stop ", 5) == 0) {
 180                 buf += 5;
 181                 start = false;
 182         } else
 183                 return -EINVAL;
 184
 185         tid = simple_strtoul(buf, NULL, 0);
 186
 187         if (tid >= STA_TID_NUM)
 188                 return -EINVAL;
 189
 190         if (tx) {
 191                 if (start)
 192                         ret = ieee80211_start_tx_ba_session(&sta->sta, tid, 5000);
 193                 else
 194                         ret = ieee80211_stop_tx_ba_session(&sta->sta, tid);
 195         } else {
 196                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
 197                                                3, true);
 198                 ret = 0;
 199         }
 200
 201         return ret ?: count;
 202 }
 203 STA_OPS_RW(agg_status);
 204
 205 static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
 206                                 size_t count, loff_t *ppos)
 207 {
 208 #define PRINT_HT_CAP(_cond, _str) \
 209         do { \
 210         if (_cond) \
 211                         p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
 212         } while (0)
 213         char buf[512], *p = buf;
 214         int i;
 215         struct sta_info *sta = file->private_data;
 216         struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
 217
 218         p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
 219                         htc->ht_supported ? "" : "not ");
 220         if (htc->ht_supported) {
 221                 p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
 222
 223                 PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDPC");
 224                 PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
 225                 PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
 226
 227                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
 228                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
 229                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
 230
 231                 PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
 232                 PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
 233                 PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
 234                 PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
 235
 236                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
 237                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
 238                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
 239                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
 240
 241                 PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
 242
 243                 PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
 244                              "3839 bytes");
 245                 PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
 246                              "7935 bytes");
 247
 248                 /*
 249                  * For beacons and probe response this would mean the BSS
 250                  * does or does not allow the usage of DSSS/CCK HT40.
 251                  * Otherwise it means the STA does or does not use
 252                  * DSSS/CCK HT40.
 253                  */
 254                 PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
 255                 PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
 256
 257                 /* BIT(13) is reserved */
 258
 259                 PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
 260
 261                 PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
 262
 263                 p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
 264                                 htc->ampdu_factor, htc->ampdu_density);
 265                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
 266
 267                 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
 268                         p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
 269                                         htc->mcs.rx_mask[i]);
 270                 p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 271
 272                 /* If not set this is meaningless */
 273                 if (le16_to_cpu(htc->mcs.rx_highest)) {
 274                         p += scnprintf(p, sizeof(buf)+buf-p,
 275                                        "MCS rx highest: %d Mbps\n",
 276                                        le16_to_cpu(htc->mcs.rx_highest));
 277                 }
 278
 279                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
 280                                 htc->mcs.tx_params);
 281         }
 282
 283         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 284 }
 285 STA_OPS(ht_capa);
 286
 287 #define DEBUGFS_ADD(name) \
 288         debugfs_create_file(#name, 0400, \
 289                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
 290
 291 #define DEBUGFS_ADD_COUNTER(name, field)                                \
 292         if (sizeof(sta->field) == sizeof(u32))                          \
 293                 debugfs_create_u32(#name, 0400, sta->debugfs.dir,       \
 294                         (u32 *) &sta->field);                           \
 295         else                                                            \
 296                 debugfs_create_u64(#name, 0400, sta->debugfs.dir,       \
 297                         (u64 *) &sta->field);
 298
 299 void ieee80211_sta_debugfs_add(struct sta_info *sta)
 300 {
 301         struct dentry *stations_dir = sta->sdata->debugfs.subdir_stations;
 302         u8 mac[3*ETH_ALEN];
 303
 304         sta->debugfs.add_has_run = true;
 305
 306         if (!stations_dir)
 307                 return;
 308
 309         snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);
 310
 311         /*
 312          * This might fail due to a race condition:
 313          * When mac80211 unlinks a station, the debugfs entries
 314          * remain, but it is already possible to link a new
 315          * station with the same address which triggers adding
 316          * it to debugfs; therefore, if the old station isn't
 317          * destroyed quickly enough the old station's debugfs
 318          * dir might still be around.
 319          */
 320         sta->debugfs.dir = debugfs_create_dir(mac, stations_dir);
 321         if (!sta->debugfs.dir)
 322                 return;
 323
 324         DEBUGFS_ADD(flags);
 325         DEBUGFS_ADD(num_ps_buf_frames);
 326         DEBUGFS_ADD(inactive_ms);
 327         DEBUGFS_ADD(last_seq_ctrl);
 328         DEBUGFS_ADD(agg_status);
 329         DEBUGFS_ADD(dev);
 330         DEBUGFS_ADD(last_signal);
 331         DEBUGFS_ADD(ht_capa);
 332
 333         DEBUGFS_ADD_COUNTER(rx_packets, rx_packets);
 334         DEBUGFS_ADD_COUNTER(tx_packets, tx_packets);
 335         DEBUGFS_ADD_COUNTER(rx_bytes, rx_bytes);
 336         DEBUGFS_ADD_COUNTER(tx_bytes, tx_bytes);
 337         DEBUGFS_ADD_COUNTER(rx_duplicates, num_duplicates);
 338         DEBUGFS_ADD_COUNTER(rx_fragments, rx_fragments);
 339         DEBUGFS_ADD_COUNTER(rx_dropped, rx_dropped);
 340         DEBUGFS_ADD_COUNTER(tx_fragments, tx_fragments);
 341         DEBUGFS_ADD_COUNTER(tx_filtered, tx_filtered_count);
 342         DEBUGFS_ADD_COUNTER(tx_retry_failed, tx_retry_failed);
 343         DEBUGFS_ADD_COUNTER(tx_retry_count, tx_retry_count);
 344         DEBUGFS_ADD_COUNTER(wep_weak_iv_count, wep_weak_iv_count);
 345 }
 346
 347 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 348 {
 349         debugfs_remove_recursive(sta->debugfs.dir);
 350         sta->debugfs.dir = NULL;
 351 }