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, buflen, 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         int res;                                                        \
  26         struct sta_info *sta = file->private_data;                      \
  27         char buf[buflen];                                               \
  28         res = scnprintf(buf, buflen, format_string, sta->field);        \
  29         return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
  30 }
  31 #define STA_READ_D(name, field) STA_READ(name, 20, field, "%d\n")
  32 #define STA_READ_U(name, field) STA_READ(name, 20, field, "%u\n")
  33 #define STA_READ_S(name, field) STA_READ(name, 20, field, "%s\n")
  34
  35 #define STA_OPS(name)                                                   \
  36 static const struct file_operations sta_ ##name## _ops = {              \
  37         .read = sta_##name##_read,                                      \
  38         .open = mac80211_open_file_generic,                             \
  39 }
  40
  41 #define STA_OPS_RW(name)                                                \
  42 static const struct file_operations sta_ ##name## _ops = {              \
  43         .read = sta_##name##_read,                                      \
  44         .write = sta_##name##_write,                                    \
  45         .open = mac80211_open_file_generic,                             \
  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         char buf[20];
  81         struct sta_info *sta = file->private_data;
  82         int res = scnprintf(buf, sizeof(buf), "%u\n",
  83                             skb_queue_len(&sta->ps_tx_buf));
  84         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  85 }
  86 STA_OPS(num_ps_buf_frames);
  87
  88 static ssize_t sta_inactive_ms_read(struct file *file, char __user *userbuf,
  89                                     size_t count, loff_t *ppos)
  90 {
  91         char buf[20];
  92         struct sta_info *sta = file->private_data;
  93         int res = scnprintf(buf, sizeof(buf), "%d\n",
  94                             jiffies_to_msecs(jiffies - sta->last_rx));
  95         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  96 }
  97 STA_OPS(inactive_ms);
  98
  99 static ssize_t sta_last_seq_ctrl_read(struct file *file, char __user *userbuf,
 100                                       size_t count, loff_t *ppos)
 101 {
 102         char buf[15*NUM_RX_DATA_QUEUES], *p = buf;
 103         int i;
 104         struct sta_info *sta = file->private_data;
 105         for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 106                 p += scnprintf(p, sizeof(buf)+buf-p, "%x ",
 107                                le16_to_cpu(sta->last_seq_ctrl[i]));
 108         p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 109         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 110 }
 111 STA_OPS(last_seq_ctrl);
 112
 113 static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
 114                                         size_t count, loff_t *ppos)
 115 {
 116         char buf[71 + STA_TID_NUM * 40], *p = buf;
 117         int i;
 118         struct sta_info *sta = file->private_data;
 119
 120         spin_lock_bh(&sta->lock);
 121         p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
 122                         sta->ampdu_mlme.dialog_token_allocator + 1);
 123         p += scnprintf(p, sizeof(buf) + buf - p,
 124                        "TID\t\tRX active\tDTKN\tSSN\t\tTX\tDTKN\tpending\n");
 125         for (i = 0; i < STA_TID_NUM; i++) {
 126                 p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
 127                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
 128                                 !!sta->ampdu_mlme.tid_rx[i]);
 129                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 130                                 sta->ampdu_mlme.tid_rx[i] ?
 131                                 sta->ampdu_mlme.tid_rx[i]->dialog_token : 0);
 132                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
 133                                 sta->ampdu_mlme.tid_rx[i] ?
 134                                 sta->ampdu_mlme.tid_rx[i]->ssn : 0);
 135
 136                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
 137                                 !!sta->ampdu_mlme.tid_tx[i]);
 138                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 139                                 sta->ampdu_mlme.tid_tx[i] ?
 140                                 sta->ampdu_mlme.tid_tx[i]->dialog_token : 0);
 141                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
 142                                 sta->ampdu_mlme.tid_tx[i] ?
 143                                 skb_queue_len(&sta->ampdu_mlme.tid_tx[i]->pending) : 0);
 144                 p += scnprintf(p, sizeof(buf) + buf - p, "\n");
 145         }
 146         spin_unlock_bh(&sta->lock);
 147
 148         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 149 }
 150
 151 static ssize_t sta_agg_status_write(struct file *file, const char __user *userbuf,
 152                                     size_t count, loff_t *ppos)
 153 {
 154         char _buf[12], *buf = _buf;
 155         struct sta_info *sta = file->private_data;
 156         bool start, tx;
 157         unsigned long tid;
 158         int ret;
 159
 160         if (count > sizeof(_buf))
 161                 return -EINVAL;
 162
 163         if (copy_from_user(buf, userbuf, count))
 164                 return -EFAULT;
 165
 166         buf[sizeof(_buf) - 1] = '\0';
 167
 168         if (strncmp(buf, "tx ", 3) == 0) {
 169                 buf += 3;
 170                 tx = true;
 171         } else if (strncmp(buf, "rx ", 3) == 0) {
 172                 buf += 3;
 173                 tx = false;
 174         } else
 175                 return -EINVAL;
 176
 177         if (strncmp(buf, "start ", 6) == 0) {
 178                 buf += 6;
 179                 start = true;
 180                 if (!tx)
 181                         return -EINVAL;
 182         } else if (strncmp(buf, "stop ", 5) == 0) {
 183                 buf += 5;
 184                 start = false;
 185         } else
 186                 return -EINVAL;
 187
 188         tid = simple_strtoul(buf, NULL, 0);
 189
 190         if (tid >= STA_TID_NUM)
 191                 return -EINVAL;
 192
 193         if (tx) {
 194                 if (start)
 195                         ret = ieee80211_start_tx_ba_session(&sta->sta, tid);
 196                 else
 197                         ret = ieee80211_stop_tx_ba_session(&sta->sta, tid);
 198         } else {
 199                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 3);
 200                 ret = 0;
 201         }
 202
 203         return ret ?: count;
 204 }
 205 STA_OPS_RW(agg_status);
 206
 207 static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
 208                                 size_t count, loff_t *ppos)
 209 {
 210 #define PRINT_HT_CAP(_cond, _str) \
 211         do { \
 212         if (_cond) \
 213                         p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
 214         } while (0)
 215         char buf[512], *p = buf;
 216         int i;
 217         struct sta_info *sta = file->private_data;
 218         struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
 219
 220         p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
 221                         htc->ht_supported ? "" : "not ");
 222         if (htc->ht_supported) {
 223                 p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
 224
 225                 PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDPC");
 226                 PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
 227                 PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
 228
 229                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
 230                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
 231                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
 232
 233                 PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
 234                 PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
 235                 PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
 236                 PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
 237
 238                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
 239                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
 240                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
 241                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
 242
 243                 PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
 244
 245                 PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
 246                              "3839 bytes");
 247                 PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
 248                              "7935 bytes");
 249
 250                 /*
 251                  * For beacons and probe response this would mean the BSS
 252                  * does or does not allow the usage of DSSS/CCK HT40.
 253                  * Otherwise it means the STA does or does not use
 254                  * DSSS/CCK HT40.
 255                  */
 256                 PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
 257                 PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
 258
 259                 /* BIT(13) is reserved */
 260
 261                 PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
 262
 263                 PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
 264
 265                 p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
 266                                 htc->ampdu_factor, htc->ampdu_density);
 267                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
 268
 269                 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
 270                         p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
 271                                         htc->mcs.rx_mask[i]);
 272                 p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 273
 274                 /* If not set this is meaningless */
 275                 if (le16_to_cpu(htc->mcs.rx_highest)) {
 276                         p += scnprintf(p, sizeof(buf)+buf-p,
 277                                        "MCS rx highest: %d Mbps\n",
 278                                        le16_to_cpu(htc->mcs.rx_highest));
 279                 }
 280
 281                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
 282                                 htc->mcs.tx_params);
 283         }
 284
 285         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 286 }
 287 STA_OPS(ht_capa);
 288
 289 #define DEBUGFS_ADD(name) \
 290         debugfs_create_file(#name, 0400, \
 291                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
 292
 293 #define DEBUGFS_ADD_COUNTER(name, field)                                \
 294         if (sizeof(sta->field) == sizeof(u32))                          \
 295                 debugfs_create_u32(#name, 0400, sta->debugfs.dir,       \
 296                         (u32 *) &sta->field);                           \
 297         else                                                            \
 298                 debugfs_create_u64(#name, 0400, sta->debugfs.dir,       \
 299                         (u64 *) &sta->field);
 300
 301 void ieee80211_sta_debugfs_add(struct sta_info *sta)
 302 {
 303         struct dentry *stations_dir = sta->local->debugfs.stations;
 304         u8 mac[3*ETH_ALEN];
 305
 306         sta->debugfs.add_has_run = true;
 307
 308         if (!stations_dir)
 309                 return;
 310
 311         snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);
 312
 313         /*
 314          * This might fail due to a race condition:
 315          * When mac80211 unlinks a station, the debugfs entries
 316          * remain, but it is already possible to link a new
 317          * station with the same address which triggers adding
 318          * it to debugfs; therefore, if the old station isn't
 319          * destroyed quickly enough the old station's debugfs
 320          * dir might still be around.
 321          */
 322         sta->debugfs.dir = debugfs_create_dir(mac, stations_dir);
 323         if (!sta->debugfs.dir)
 324                 return;
 325
 326         DEBUGFS_ADD(flags);
 327         DEBUGFS_ADD(num_ps_buf_frames);
 328         DEBUGFS_ADD(inactive_ms);
 329         DEBUGFS_ADD(last_seq_ctrl);
 330         DEBUGFS_ADD(agg_status);
 331         DEBUGFS_ADD(dev);
 332         DEBUGFS_ADD(last_signal);
 333         DEBUGFS_ADD(ht_capa);
 334
 335         DEBUGFS_ADD_COUNTER(rx_packets, rx_packets);
 336         DEBUGFS_ADD_COUNTER(tx_packets, tx_packets);
 337         DEBUGFS_ADD_COUNTER(rx_bytes, rx_bytes);
 338         DEBUGFS_ADD_COUNTER(tx_bytes, tx_bytes);
 339         DEBUGFS_ADD_COUNTER(rx_duplicates, num_duplicates);
 340         DEBUGFS_ADD_COUNTER(rx_fragments, rx_fragments);
 341         DEBUGFS_ADD_COUNTER(rx_dropped, rx_dropped);
 342         DEBUGFS_ADD_COUNTER(tx_fragments, tx_fragments);
 343         DEBUGFS_ADD_COUNTER(tx_filtered, tx_filtered_count);
 344         DEBUGFS_ADD_COUNTER(tx_retry_failed, tx_retry_failed);
 345         DEBUGFS_ADD_COUNTER(tx_retry_count, tx_retry_count);
 346         DEBUGFS_ADD_COUNTER(wep_weak_iv_count, wep_weak_iv_count);
 347 }
 348
 349 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 350 {
 351         debugfs_remove_recursive(sta->debugfs.dir);
 352         sta->debugfs.dir = NULL;
 353 }