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  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/debugfs.h>
  13 #include <linux/ieee80211.h>
  14 #include "ieee80211_i.h"
  15 #include "debugfs.h"
  16 #include "debugfs_sta.h"
  17 #include "sta_info.h"
  18 #include "driver-ops.h"
  19
  20 /* sta attributtes */
  21
  22 #define STA_READ(name, field, format_string)                            \
  23 static ssize_t sta_ ##name## _read(struct file *file,                   \
  24                                    char __user *userbuf,                \
  25                                    size_t count, loff_t *ppos)          \
  26 {                                                                       \
  27         struct sta_info *sta = file->private_data;                      \
  28         return mac80211_format_buffer(userbuf, count, ppos,             \
  29                                       format_string, sta->field);       \
  30 }
  31 #define STA_READ_D(name, field) STA_READ(name, field, "%d\n")
  32
  33 #define STA_OPS(name)                                                   \
  34 static const struct file_operations sta_ ##name## _ops = {              \
  35         .read = sta_##name##_read,                                      \
  36         .open = simple_open,                                            \
  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 = simple_open,                                            \
  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(last_ack_signal, last_ack_signal, 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[12] = {}, *buf = _buf;
 156         struct sta_info *sta = file->private_data;
 157         bool start, tx;
 158         unsigned long tid;
 159         int ret;
 160
 161         if (count > sizeof(_buf))
 162                 return -EINVAL;
 163
 164         if (copy_from_user(buf, userbuf, count))
 165                 return -EFAULT;
 166
 167         buf[sizeof(_buf) - 1] = '\0';
 168
 169         if (strncmp(buf, "tx ", 3) == 0) {
 170                 buf += 3;
 171                 tx = true;
 172         } else if (strncmp(buf, "rx ", 3) == 0) {
 173                 buf += 3;
 174                 tx = false;
 175         } else
 176                 return -EINVAL;
 177
 178         if (strncmp(buf, "start ", 6) == 0) {
 179                 buf += 6;
 180                 start = true;
 181                 if (!tx)
 182                         return -EINVAL;
 183         } else if (strncmp(buf, "stop ", 5) == 0) {
 184                 buf += 5;
 185                 start = false;
 186         } else
 187                 return -EINVAL;
 188
 189         ret = kstrtoul(buf, 0, &tid);
 190         if (ret)
 191                 return ret;
 192
 193         if (tid >= IEEE80211_NUM_TIDS)
 194                 return -EINVAL;
 195
 196         if (tx) {
 197                 if (start)
 198                         ret = ieee80211_start_tx_ba_session(&sta->sta, tid, 5000);
 199                 else
 200                         ret = ieee80211_stop_tx_ba_session(&sta->sta, tid);
 201         } else {
 202                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
 203                                                3, true);
 204                 ret = 0;
 205         }
 206
 207         return ret ?: count;
 208 }
 209 STA_OPS_RW(agg_status);
 210
 211 static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
 212                                 size_t count, loff_t *ppos)
 213 {
 214 #define PRINT_HT_CAP(_cond, _str) \
 215         do { \
 216         if (_cond) \
 217                         p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
 218         } while (0)
 219         char buf[512], *p = buf;
 220         int i;
 221         struct sta_info *sta = file->private_data;
 222         struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
 223
 224         p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
 225                         htc->ht_supported ? "" : "not ");
 226         if (htc->ht_supported) {
 227                 p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
 228
 229                 PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDPC");
 230                 PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
 231                 PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
 232
 233                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
 234                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
 235                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
 236
 237                 PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
 238                 PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
 239                 PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
 240                 PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
 241
 242                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
 243                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
 244                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
 245                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
 246
 247                 PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
 248
 249                 PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
 250                              "3839 bytes");
 251                 PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
 252                              "7935 bytes");
 253
 254                 /*
 255                  * For beacons and probe response this would mean the BSS
 256                  * does or does not allow the usage of DSSS/CCK HT40.
 257                  * Otherwise it means the STA does or does not use
 258                  * DSSS/CCK HT40.
 259                  */
 260                 PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
 261                 PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
 262
 263                 /* BIT(13) is reserved */
 264
 265                 PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
 266
 267                 PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
 268
 269                 p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
 270                                 htc->ampdu_factor, htc->ampdu_density);
 271                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
 272
 273                 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
 274                         p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
 275                                         htc->mcs.rx_mask[i]);
 276                 p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 277
 278                 /* If not set this is meaningless */
 279                 if (le16_to_cpu(htc->mcs.rx_highest)) {
 280                         p += scnprintf(p, sizeof(buf)+buf-p,
 281                                        "MCS rx highest: %d Mbps\n",
 282                                        le16_to_cpu(htc->mcs.rx_highest));
 283                 }
 284
 285                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
 286                                 htc->mcs.tx_params);
 287         }
 288
 289         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 290 }
 291 STA_OPS(ht_capa);
 292
 293 static ssize_t sta_vht_capa_read(struct file *file, char __user *userbuf,
 294                                  size_t count, loff_t *ppos)
 295 {
 296         char buf[128], *p = buf;
 297         struct sta_info *sta = file->private_data;
 298         struct ieee80211_sta_vht_cap *vhtc = &sta->sta.vht_cap;
 299
 300         p += scnprintf(p, sizeof(buf) + buf - p, "VHT %ssupported\n",
 301                         vhtc->vht_supported ? "" : "not ");
 302         if (vhtc->vht_supported) {
 303                 p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.8x\n", vhtc->cap);
 304
 305                 p += scnprintf(p, sizeof(buf)+buf-p, "RX MCS: %.4x\n",
 306                                le16_to_cpu(vhtc->vht_mcs.rx_mcs_map));
 307                 if (vhtc->vht_mcs.rx_highest)
 308                         p += scnprintf(p, sizeof(buf)+buf-p,
 309                                        "MCS RX highest: %d Mbps\n",
 310                                        le16_to_cpu(vhtc->vht_mcs.rx_highest));
 311                 p += scnprintf(p, sizeof(buf)+buf-p, "TX MCS: %.4x\n",
 312                                le16_to_cpu(vhtc->vht_mcs.tx_mcs_map));
 313                 if (vhtc->vht_mcs.tx_highest)
 314                         p += scnprintf(p, sizeof(buf)+buf-p,
 315                                        "MCS TX highest: %d Mbps\n",
 316                                        le16_to_cpu(vhtc->vht_mcs.tx_highest));
 317         }
 318
 319         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 320 }
 321 STA_OPS(vht_capa);
 322
 323
 324 #define DEBUGFS_ADD(name) \
 325         debugfs_create_file(#name, 0400, \
 326                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
 327
 328 #define DEBUGFS_ADD_COUNTER(name, field)                                \
 329         if (sizeof(sta->field) == sizeof(u32))                          \
 330                 debugfs_create_u32(#name, 0400, sta->debugfs.dir,       \
 331                         (u32 *) &sta->field);                           \
 332         else                                                            \
 333                 debugfs_create_u64(#name, 0400, sta->debugfs.dir,       \
 334                         (u64 *) &sta->field);
 335
 336 void ieee80211_sta_debugfs_add(struct sta_info *sta)
 337 {
 338         struct ieee80211_local *local = sta->local;
 339         struct ieee80211_sub_if_data *sdata = sta->sdata;
 340         struct dentry *stations_dir = sta->sdata->debugfs.subdir_stations;
 341         u8 mac[3*ETH_ALEN];
 342
 343         sta->debugfs.add_has_run = true;
 344
 345         if (!stations_dir)
 346                 return;
 347
 348         snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);
 349
 350         /*
 351          * This might fail due to a race condition:
 352          * When mac80211 unlinks a station, the debugfs entries
 353          * remain, but it is already possible to link a new
 354          * station with the same address which triggers adding
 355          * it to debugfs; therefore, if the old station isn't
 356          * destroyed quickly enough the old station's debugfs
 357          * dir might still be around.
 358          */
 359         sta->debugfs.dir = debugfs_create_dir(mac, stations_dir);
 360         if (!sta->debugfs.dir)
 361                 return;
 362
 363         DEBUGFS_ADD(flags);
 364         DEBUGFS_ADD(num_ps_buf_frames);
 365         DEBUGFS_ADD(last_seq_ctrl);
 366         DEBUGFS_ADD(agg_status);
 367         DEBUGFS_ADD(ht_capa);
 368         DEBUGFS_ADD(vht_capa);
 369         DEBUGFS_ADD(last_ack_signal);
 370
 371         DEBUGFS_ADD_COUNTER(rx_duplicates, num_duplicates);
 372         DEBUGFS_ADD_COUNTER(rx_fragments, rx_fragments);
 373         DEBUGFS_ADD_COUNTER(tx_filtered, tx_filtered_count);
 374
 375         if (sizeof(sta->driver_buffered_tids) == sizeof(u32))
 376                 debugfs_create_x32("driver_buffered_tids", 0400,
 377                                    sta->debugfs.dir,
 378                                    (u32 *)&sta->driver_buffered_tids);
 379         else
 380                 debugfs_create_x64("driver_buffered_tids", 0400,
 381                                    sta->debugfs.dir,
 382                                    (u64 *)&sta->driver_buffered_tids);
 383
 384         drv_sta_add_debugfs(local, sdata, &sta->sta, sta->debugfs.dir);
 385 }
 386
 387 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 388 {
 389         struct ieee80211_local *local = sta->local;
 390         struct ieee80211_sub_if_data *sdata = sta->sdata;
 391
 392         drv_sta_remove_debugfs(local, sdata, &sta->sta, sta->debugfs.dir);
 393         debugfs_remove_recursive(sta->debugfs.dir);
 394         sta->debugfs.dir = NULL;
 395 }