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  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  * Copyright(c) 2016 Intel Deutschland GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/debugfs.h>
  14 #include <linux/ieee80211.h>
  15 #include "ieee80211_i.h"
  16 #include "debugfs.h"
  17 #include "debugfs_sta.h"
  18 #include "sta_info.h"
  19 #include "driver-ops.h"
  20
  21 /* sta attributtes */
  22
  23 #define STA_READ(name, field, format_string)                            \
  24 static ssize_t sta_ ##name## _read(struct file *file,                   \
  25                                    char __user *userbuf,                \
  26                                    size_t count, loff_t *ppos)          \
  27 {                                                                       \
  28         struct sta_info *sta = file->private_data;                      \
  29         return mac80211_format_buffer(userbuf, count, ppos,             \
  30                                       format_string, sta->field);       \
  31 }
  32 #define STA_READ_D(name, field) STA_READ(name, field, "%d\n")
  33
  34 #define STA_OPS(name)                                                   \
  35 static const struct file_operations sta_ ##name## _ops = {              \
  36         .read = sta_##name##_read,                                      \
  37         .open = simple_open,                                            \
  38         .llseek = generic_file_llseek,                                  \
  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 = simple_open,                                            \
  46         .llseek = generic_file_llseek,                                  \
  47 }
  48
  49 #define STA_FILE(name, field, format)                                   \
  50                 STA_READ_##format(name, field)                          \
  51                 STA_OPS(name)
  52
  53 STA_FILE(aid, sta.aid, D);
  54
  55 static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
  56                               size_t count, loff_t *ppos)
  57 {
  58         char buf[121];
  59         struct sta_info *sta = file->private_data;
  60
  61 #define TEST(flg) \
  62         test_sta_flag(sta, WLAN_STA_##flg) ? #flg "\n" : ""
  63
  64         int res = scnprintf(buf, sizeof(buf),
  65                             "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
  66                             TEST(AUTH), TEST(ASSOC), TEST(PS_STA),
  67                             TEST(PS_DRIVER), TEST(AUTHORIZED),
  68                             TEST(SHORT_PREAMBLE),
  69                             sta->sta.wme ? "WME\n" : "",
  70                             TEST(WDS), TEST(CLEAR_PS_FILT),
  71                             TEST(MFP), TEST(BLOCK_BA), TEST(PSPOLL),
  72                             TEST(UAPSD), TEST(SP), TEST(TDLS_PEER),
  73                             TEST(TDLS_PEER_AUTH), TEST(TDLS_INITIATOR),
  74                             TEST(TDLS_CHAN_SWITCH), TEST(TDLS_OFF_CHANNEL),
  75                             TEST(4ADDR_EVENT), TEST(INSERTED),
  76                             TEST(RATE_CONTROL), TEST(TOFFSET_KNOWN),
  77                             TEST(MPSP_OWNER), TEST(MPSP_RECIPIENT));
  78 #undef TEST
  79         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  80 }
  81 STA_OPS(flags);
  82
  83 static ssize_t sta_num_ps_buf_frames_read(struct file *file,
  84                                           char __user *userbuf,
  85                                           size_t count, loff_t *ppos)
  86 {
  87         struct sta_info *sta = file->private_data;
  88         char buf[17*IEEE80211_NUM_ACS], *p = buf;
  89         int ac;
  90
  91         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
  92                 p += scnprintf(p, sizeof(buf)+buf-p, "AC%d: %d\n", ac,
  93                                skb_queue_len(&sta->ps_tx_buf[ac]) +
  94                                skb_queue_len(&sta->tx_filtered[ac]));
  95         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
  96 }
  97 STA_OPS(num_ps_buf_frames);
  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*IEEE80211_NUM_TIDS], *p = buf;
 103         int i;
 104         struct sta_info *sta = file->private_data;
 105         for (i = 0; i < IEEE80211_NUM_TIDS; 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 + IEEE80211_NUM_TIDS * 40], *p = buf;
 117         int i;
 118         struct sta_info *sta = file->private_data;
 119         struct tid_ampdu_rx *tid_rx;
 120         struct tid_ampdu_tx *tid_tx;
 121
 122         rcu_read_lock();
 123
 124         p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
 125                         sta->ampdu_mlme.dialog_token_allocator + 1);
 126         p += scnprintf(p, sizeof(buf) + buf - p,
 127                        "TID\t\tRX\tDTKN\tSSN\t\tTX\tDTKN\tpending\n");
 128
 129         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 130                 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[i]);
 131                 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[i]);
 132
 133                 p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
 134                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_rx);
 135                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 136                                 tid_rx ? tid_rx->dialog_token : 0);
 137                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
 138                                 tid_rx ? tid_rx->ssn : 0);
 139
 140                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_tx);
 141                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 142                                 tid_tx ? tid_tx->dialog_token : 0);
 143                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
 144                                 tid_tx ? skb_queue_len(&tid_tx->pending) : 0);
 145                 p += scnprintf(p, sizeof(buf) + buf - p, "\n");
 146         }
 147         rcu_read_unlock();
 148
 149         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 150 }
 151
 152 static ssize_t sta_agg_status_write(struct file *file, const char __user *userbuf,
 153                                     size_t count, loff_t *ppos)
 154 {
 155         char _buf[25] = {}, *buf = _buf;
 156         struct sta_info *sta = file->private_data;
 157         bool start, tx;
 158         unsigned long tid;
 159         char *pos;
 160         int ret, timeout = 5000;
 161
 162         if (count > sizeof(_buf))
 163                 return -EINVAL;
 164
 165         if (copy_from_user(buf, userbuf, count))
 166                 return -EFAULT;
 167
 168         buf[sizeof(_buf) - 1] = '\0';
 169         pos = buf;
 170         buf = strsep(&pos, " ");
 171         if (!buf)
 172                 return -EINVAL;
 173
 174         if (!strcmp(buf, "tx"))
 175                 tx = true;
 176         else if (!strcmp(buf, "rx"))
 177                 tx = false;
 178         else
 179                 return -EINVAL;
 180
 181         buf = strsep(&pos, " ");
 182         if (!buf)
 183                 return -EINVAL;
 184         if (!strcmp(buf, "start")) {
 185                 start = true;
 186                 if (!tx)
 187                         return -EINVAL;
 188         } else if (!strcmp(buf, "stop")) {
 189                 start = false;
 190         } else {
 191                 return -EINVAL;
 192         }
 193
 194         buf = strsep(&pos, " ");
 195         if (!buf)
 196                 return -EINVAL;
 197         if (sscanf(buf, "timeout=%d", &timeout) == 1) {
 198                 buf = strsep(&pos, " ");
 199                 if (!buf || !tx || !start)
 200                         return -EINVAL;
 201         }
 202
 203         ret = kstrtoul(buf, 0, &tid);
 204         if (ret || tid >= IEEE80211_NUM_TIDS)
 205                 return -EINVAL;
 206
 207         if (tx) {
 208                 if (start)
 209                         ret = ieee80211_start_tx_ba_session(&sta->sta, tid,
 210                                                             timeout);
 211                 else
 212                         ret = ieee80211_stop_tx_ba_session(&sta->sta, tid);
 213         } else {
 214                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
 215                                                3, true);
 216                 ret = 0;
 217         }
 218
 219         return ret ?: count;
 220 }
 221 STA_OPS_RW(agg_status);
 222
 223 static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
 224                                 size_t count, loff_t *ppos)
 225 {
 226 #define PRINT_HT_CAP(_cond, _str) \
 227         do { \
 228         if (_cond) \
 229                         p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
 230         } while (0)
 231         char buf[512], *p = buf;
 232         int i;
 233         struct sta_info *sta = file->private_data;
 234         struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
 235
 236         p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
 237                         htc->ht_supported ? "" : "not ");
 238         if (htc->ht_supported) {
 239                 p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
 240
 241                 PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDPC");
 242                 PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
 243                 PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
 244
 245                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
 246                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
 247                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
 248
 249                 PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
 250                 PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
 251                 PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
 252                 PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
 253
 254                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
 255                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
 256                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
 257                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
 258
 259                 PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
 260
 261                 PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
 262                              "3839 bytes");
 263                 PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
 264                              "7935 bytes");
 265
 266                 /*
 267                  * For beacons and probe response this would mean the BSS
 268                  * does or does not allow the usage of DSSS/CCK HT40.
 269                  * Otherwise it means the STA does or does not use
 270                  * DSSS/CCK HT40.
 271                  */
 272                 PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
 273                 PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
 274
 275                 /* BIT(13) is reserved */
 276
 277                 PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
 278
 279                 PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
 280
 281                 p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
 282                                 htc->ampdu_factor, htc->ampdu_density);
 283                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
 284
 285                 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
 286                         p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
 287                                         htc->mcs.rx_mask[i]);
 288                 p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 289
 290                 /* If not set this is meaningless */
 291                 if (le16_to_cpu(htc->mcs.rx_highest)) {
 292                         p += scnprintf(p, sizeof(buf)+buf-p,
 293                                        "MCS rx highest: %d Mbps\n",
 294                                        le16_to_cpu(htc->mcs.rx_highest));
 295                 }
 296
 297                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
 298                                 htc->mcs.tx_params);
 299         }
 300
 301         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 302 }
 303 STA_OPS(ht_capa);
 304
 305 static ssize_t sta_vht_capa_read(struct file *file, char __user *userbuf,
 306                                  size_t count, loff_t *ppos)
 307 {
 308         char buf[128], *p = buf;
 309         struct sta_info *sta = file->private_data;
 310         struct ieee80211_sta_vht_cap *vhtc = &sta->sta.vht_cap;
 311
 312         p += scnprintf(p, sizeof(buf) + buf - p, "VHT %ssupported\n",
 313                         vhtc->vht_supported ? "" : "not ");
 314         if (vhtc->vht_supported) {
 315                 p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.8x\n", vhtc->cap);
 316
 317                 p += scnprintf(p, sizeof(buf)+buf-p, "RX MCS: %.4x\n",
 318                                le16_to_cpu(vhtc->vht_mcs.rx_mcs_map));
 319                 if (vhtc->vht_mcs.rx_highest)
 320                         p += scnprintf(p, sizeof(buf)+buf-p,
 321                                        "MCS RX highest: %d Mbps\n",
 322                                        le16_to_cpu(vhtc->vht_mcs.rx_highest));
 323                 p += scnprintf(p, sizeof(buf)+buf-p, "TX MCS: %.4x\n",
 324                                le16_to_cpu(vhtc->vht_mcs.tx_mcs_map));
 325                 if (vhtc->vht_mcs.tx_highest)
 326                         p += scnprintf(p, sizeof(buf)+buf-p,
 327                                        "MCS TX highest: %d Mbps\n",
 328                                        le16_to_cpu(vhtc->vht_mcs.tx_highest));
 329         }
 330
 331         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 332 }
 333 STA_OPS(vht_capa);
 334
 335
 336 #define DEBUGFS_ADD(name) \
 337         debugfs_create_file(#name, 0400, \
 338                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
 339
 340 #define DEBUGFS_ADD_COUNTER(name, field)                                \
 341         if (sizeof(sta->field) == sizeof(u32))                          \
 342                 debugfs_create_u32(#name, 0400, sta->debugfs.dir,       \
 343                         (u32 *) &sta->field);                           \
 344         else                                                            \
 345                 debugfs_create_u64(#name, 0400, sta->debugfs.dir,       \
 346                         (u64 *) &sta->field);
 347
 348 void ieee80211_sta_debugfs_add(struct sta_info *sta)
 349 {
 350         struct ieee80211_local *local = sta->local;
 351         struct ieee80211_sub_if_data *sdata = sta->sdata;
 352         struct dentry *stations_dir = sta->sdata->debugfs.subdir_stations;
 353         u8 mac[3*ETH_ALEN];
 354
 355         if (!stations_dir)
 356                 return;
 357
 358         snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);
 359
 360         /*
 361          * This might fail due to a race condition:
 362          * When mac80211 unlinks a station, the debugfs entries
 363          * remain, but it is already possible to link a new
 364          * station with the same address which triggers adding
 365          * it to debugfs; therefore, if the old station isn't
 366          * destroyed quickly enough the old station's debugfs
 367          * dir might still be around.
 368          */
 369         sta->debugfs.dir = debugfs_create_dir(mac, stations_dir);
 370         if (!sta->debugfs.dir)
 371                 return;
 372
 373         DEBUGFS_ADD(flags);
 374         DEBUGFS_ADD(num_ps_buf_frames);
 375         DEBUGFS_ADD(last_seq_ctrl);
 376         DEBUGFS_ADD(agg_status);
 377         DEBUGFS_ADD(ht_capa);
 378         DEBUGFS_ADD(vht_capa);
 379
 380         DEBUGFS_ADD_COUNTER(rx_duplicates, rx_stats.num_duplicates);
 381         DEBUGFS_ADD_COUNTER(rx_fragments, rx_stats.fragments);
 382         DEBUGFS_ADD_COUNTER(tx_filtered, status_stats.filtered);
 383
 384         if (sizeof(sta->driver_buffered_tids) == sizeof(u32))
 385                 debugfs_create_x32("driver_buffered_tids", 0400,
 386                                    sta->debugfs.dir,
 387                                    (u32 *)&sta->driver_buffered_tids);
 388         else
 389                 debugfs_create_x64("driver_buffered_tids", 0400,
 390                                    sta->debugfs.dir,
 391                                    (u64 *)&sta->driver_buffered_tids);
 392
 393         drv_sta_add_debugfs(local, sdata, &sta->sta, sta->debugfs.dir);
 394 }
 395
 396 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 397 {
 398         struct ieee80211_local *local = sta->local;
 399         struct ieee80211_sub_if_data *sdata = sta->sdata;
 400
 401         drv_sta_remove_debugfs(local, sdata, &sta->sta, sta->debugfs.dir);
 402         debugfs_remove_recursive(sta->debugfs.dir);
 403         sta->debugfs.dir = NULL;
 404 }