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   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_LU(name, field) STA_READ(name, 20, field, "%lu\n")
  34 #define STA_READ_S(name, field) STA_READ(name, 20, field, "%s\n")
  35
  36 #define STA_OPS(name)                                                   \
  37 static const struct file_operations sta_ ##name## _ops = {              \
  38         .read = sta_##name##_read,                                      \
  39         .open = mac80211_open_file_generic,                             \
  40 }
  41
  42 #define STA_FILE(name, field, format)                                   \
  43                 STA_READ_##format(name, field)                          \
  44                 STA_OPS(name)
  45
  46 STA_FILE(aid, sta.aid, D);
  47 STA_FILE(dev, sdata->name, S);
  48 STA_FILE(rx_packets, rx_packets, LU);
  49 STA_FILE(tx_packets, tx_packets, LU);
  50 STA_FILE(rx_bytes, rx_bytes, LU);
  51 STA_FILE(tx_bytes, tx_bytes, LU);
  52 STA_FILE(rx_duplicates, num_duplicates, LU);
  53 STA_FILE(rx_fragments, rx_fragments, LU);
  54 STA_FILE(rx_dropped, rx_dropped, LU);
  55 STA_FILE(tx_fragments, tx_fragments, LU);
  56 STA_FILE(tx_filtered, tx_filtered_count, LU);
  57 STA_FILE(tx_retry_failed, tx_retry_failed, LU);
  58 STA_FILE(tx_retry_count, tx_retry_count, LU);
  59 STA_FILE(last_signal, last_signal, D);
  60 STA_FILE(wep_weak_iv_count, wep_weak_iv_count, LU);
  61
  62 static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
  63                               size_t count, loff_t *ppos)
  64 {
  65         char buf[100];
  66         struct sta_info *sta = file->private_data;
  67         u32 staflags = get_sta_flags(sta);
  68         int res = scnprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s",
  69                 staflags & WLAN_STA_AUTH ? "AUTH\n" : "",
  70                 staflags & WLAN_STA_ASSOC ? "ASSOC\n" : "",
  71                 staflags & WLAN_STA_PS_STA ? "PS (sta)\n" : "",
  72                 staflags & WLAN_STA_PS_DRIVER ? "PS (driver)\n" : "",
  73                 staflags & WLAN_STA_AUTHORIZED ? "AUTHORIZED\n" : "",
  74                 staflags & WLAN_STA_SHORT_PREAMBLE ? "SHORT PREAMBLE\n" : "",
  75                 staflags & WLAN_STA_WME ? "WME\n" : "",
  76                 staflags & WLAN_STA_WDS ? "WDS\n" : "",
  77                 staflags & WLAN_STA_MFP ? "MFP\n" : "");
  78         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  79 }
  80 STA_OPS(flags);
  81
  82 static ssize_t sta_num_ps_buf_frames_read(struct file *file,
  83                                           char __user *userbuf,
  84                                           size_t count, loff_t *ppos)
  85 {
  86         char buf[20];
  87         struct sta_info *sta = file->private_data;
  88         int res = scnprintf(buf, sizeof(buf), "%u\n",
  89                             skb_queue_len(&sta->ps_tx_buf));
  90         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  91 }
  92 STA_OPS(num_ps_buf_frames);
  93
  94 static ssize_t sta_inactive_ms_read(struct file *file, char __user *userbuf,
  95                                     size_t count, loff_t *ppos)
  96 {
  97         char buf[20];
  98         struct sta_info *sta = file->private_data;
  99         int res = scnprintf(buf, sizeof(buf), "%d\n",
 100                             jiffies_to_msecs(jiffies - sta->last_rx));
 101         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 102 }
 103 STA_OPS(inactive_ms);
 104
 105 static ssize_t sta_last_seq_ctrl_read(struct file *file, char __user *userbuf,
 106                                       size_t count, loff_t *ppos)
 107 {
 108         char buf[15*NUM_RX_DATA_QUEUES], *p = buf;
 109         int i;
 110         struct sta_info *sta = file->private_data;
 111         for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 112                 p += scnprintf(p, sizeof(buf)+buf-p, "%x ",
 113                                le16_to_cpu(sta->last_seq_ctrl[i]));
 114         p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 115         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 116 }
 117 STA_OPS(last_seq_ctrl);
 118
 119 static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
 120                                         size_t count, loff_t *ppos)
 121 {
 122         char buf[64 + STA_TID_NUM * 40], *p = buf;
 123         int i;
 124         struct sta_info *sta = file->private_data;
 125
 126         spin_lock_bh(&sta->lock);
 127         p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
 128                         sta->ampdu_mlme.dialog_token_allocator + 1);
 129         p += scnprintf(p, sizeof(buf) + buf - p,
 130                        "TID\t\tRX\tDTKN\tSSN\t\tTX\tDTKN\tSSN\tpending\n");
 131         for (i = 0; i < STA_TID_NUM; i++) {
 132                 p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
 133                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
 134                                 sta->ampdu_mlme.tid_state_rx[i]);
 135                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 136                                 sta->ampdu_mlme.tid_state_rx[i] ?
 137                                 sta->ampdu_mlme.tid_rx[i]->dialog_token : 0);
 138                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
 139                                 sta->ampdu_mlme.tid_state_rx[i] ?
 140                                 sta->ampdu_mlme.tid_rx[i]->ssn : 0);
 141
 142                 p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
 143                                 sta->ampdu_mlme.tid_state_tx[i]);
 144                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
 145                                 sta->ampdu_mlme.tid_state_tx[i] ?
 146                                 sta->ampdu_mlme.tid_tx[i]->dialog_token : 0);
 147                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
 148                                 sta->ampdu_mlme.tid_state_tx[i] ?
 149                                 sta->ampdu_mlme.tid_tx[i]->ssn : 0);
 150                 p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
 151                                 sta->ampdu_mlme.tid_state_tx[i] ?
 152                                 skb_queue_len(&sta->ampdu_mlme.tid_tx[i]->pending) : 0);
 153                 p += scnprintf(p, sizeof(buf) + buf - p, "\n");
 154         }
 155         spin_unlock_bh(&sta->lock);
 156
 157         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 158 }
 159 STA_OPS(agg_status);
 160
 161 static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
 162                                 size_t count, loff_t *ppos)
 163 {
 164 #define PRINT_HT_CAP(_cond, _str) \
 165         do { \
 166         if (_cond) \
 167                         p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
 168         } while (0)
 169         char buf[512], *p = buf;
 170         int i;
 171         struct sta_info *sta = file->private_data;
 172         struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
 173
 174         p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
 175                         htc->ht_supported ? "" : "not ");
 176         if (htc->ht_supported) {
 177                 p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
 178
 179                 PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDCP");
 180                 PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
 181                 PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
 182
 183                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
 184                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
 185                 PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
 186
 187                 PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
 188                 PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
 189                 PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
 190                 PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
 191
 192                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
 193                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
 194                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
 195                 PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
 196
 197                 PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
 198
 199                 PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
 200                              "3839 bytes");
 201                 PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
 202                              "7935 bytes");
 203
 204                 /*
 205                  * For beacons and probe response this would mean the BSS
 206                  * does or does not allow the usage of DSSS/CCK HT40.
 207                  * Otherwise it means the STA does or does not use
 208                  * DSSS/CCK HT40.
 209                  */
 210                 PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
 211                 PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
 212
 213                 /* BIT(13) is reserved */
 214
 215                 PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
 216
 217                 PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
 218
 219                 p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
 220                                 htc->ampdu_factor, htc->ampdu_density);
 221                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
 222
 223                 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
 224                         p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
 225                                         htc->mcs.rx_mask[i]);
 226                 p += scnprintf(p, sizeof(buf)+buf-p, "\n");
 227
 228                 /* If not set this is meaningless */
 229                 if (le16_to_cpu(htc->mcs.rx_highest)) {
 230                         p += scnprintf(p, sizeof(buf)+buf-p,
 231                                        "MCS rx highest: %d Mbps\n",
 232                                        le16_to_cpu(htc->mcs.rx_highest));
 233                 }
 234
 235                 p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
 236                                 htc->mcs.tx_params);
 237         }
 238
 239         return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
 240 }
 241 STA_OPS(ht_capa);
 242
 243 #define DEBUGFS_ADD(name) \
 244         debugfs_create_file(#name, 0400, \
 245                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
 246
 247
 248 void ieee80211_sta_debugfs_add(struct sta_info *sta)
 249 {
 250         struct dentry *stations_dir = sta->local->debugfs.stations;
 251         u8 mac[3*ETH_ALEN];
 252
 253         sta->debugfs.add_has_run = true;
 254
 255         if (!stations_dir)
 256                 return;
 257
 258         snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);
 259
 260         /*
 261          * This might fail due to a race condition:
 262          * When mac80211 unlinks a station, the debugfs entries
 263          * remain, but it is already possible to link a new
 264          * station with the same address which triggers adding
 265          * it to debugfs; therefore, if the old station isn't
 266          * destroyed quickly enough the old station's debugfs
 267          * dir might still be around.
 268          */
 269         sta->debugfs.dir = debugfs_create_dir(mac, stations_dir);
 270         if (!sta->debugfs.dir)
 271                 return;
 272
 273         DEBUGFS_ADD(flags);
 274         DEBUGFS_ADD(num_ps_buf_frames);
 275         DEBUGFS_ADD(inactive_ms);
 276         DEBUGFS_ADD(last_seq_ctrl);
 277         DEBUGFS_ADD(agg_status);
 278         DEBUGFS_ADD(dev);
 279         DEBUGFS_ADD(rx_packets);
 280         DEBUGFS_ADD(tx_packets);
 281         DEBUGFS_ADD(rx_bytes);
 282         DEBUGFS_ADD(tx_bytes);
 283         DEBUGFS_ADD(rx_duplicates);
 284         DEBUGFS_ADD(rx_fragments);
 285         DEBUGFS_ADD(rx_dropped);
 286         DEBUGFS_ADD(tx_fragments);
 287         DEBUGFS_ADD(tx_filtered);
 288         DEBUGFS_ADD(tx_retry_failed);
 289         DEBUGFS_ADD(tx_retry_count);
 290         DEBUGFS_ADD(last_signal);
 291         DEBUGFS_ADD(wep_weak_iv_count);
 292         DEBUGFS_ADD(ht_capa);
 293 }
 294
 295 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 296 {
 297         debugfs_remove_recursive(sta->debugfs.dir);
 298         sta->debugfs.dir = NULL;
 299 }