net/mac80211/ieee80211_i.h

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
   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 #ifndef IEEE80211_I_H
  13 #define IEEE80211_I_H
  14
  15 #include <linux/kernel.h>
  16 #include <linux/device.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/list.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/types.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/etherdevice.h>
  26 #include <net/wireless.h>
  27 #include <net/iw_handler.h>
  28 #include <net/mac80211.h>
  29 #include "key.h"
  30 #include "sta_info.h"
  31
  32 /* ieee80211.o internal definitions, etc. These are not included into
  33  * low-level drivers. */
  34
  35 struct ieee80211_local;
  36
  37 /* Maximum number of broadcast/multicast frames to buffer when some of the
  38  * associated stations are using power saving. */
  39 #define AP_MAX_BC_BUFFER 128
  40
  41 /* Maximum number of frames buffered to all STAs, including multicast frames.
  42  * Note: increasing this limit increases the potential memory requirement. Each
  43  * frame can be up to about 2 kB long. */
  44 #define TOTAL_MAX_TX_BUFFER 512
  45
  46 /* Required encryption head and tailroom */
  47 #define IEEE80211_ENCRYPT_HEADROOM 8
  48 #define IEEE80211_ENCRYPT_TAILROOM 12
  49
  50 /* IEEE 802.11 (Ch. 9.5 Defragmentation) requires support for concurrent
  51  * reception of at least three fragmented frames. This limit can be increased
  52  * by changing this define, at the cost of slower frame reassembly and
  53  * increased memory use (about 2 kB of RAM per entry). */
  54 #define IEEE80211_FRAGMENT_MAX 4
  55
  56 /*
  57  * Time after which we ignore scan results and no longer report/use
  58  * them in any way.
  59  */
  60 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  61
  62 struct ieee80211_fragment_entry {
  63         unsigned long first_frag_time;
  64         unsigned int seq;
  65         unsigned int rx_queue;
  66         unsigned int last_frag;
  67         unsigned int extra_len;
  68         struct sk_buff_head skb_list;
  69         int ccmp; /* Whether fragments were encrypted with CCMP */
  70         u8 last_pn[6]; /* PN of the last fragment if CCMP was used */
  71 };
  72
  73
  74 struct ieee80211_sta_bss {
  75         struct list_head list;
  76         struct ieee80211_sta_bss *hnext;
  77         size_t ssid_len;
  78
  79         atomic_t users;
  80
  81         u8 bssid[ETH_ALEN];
  82         u8 ssid[IEEE80211_MAX_SSID_LEN];
  83         u8 dtim_period;
  84         u16 capability; /* host byte order */
  85         enum ieee80211_band band;
  86         int freq;
  87         int signal, noise, qual;
  88         u8 *ies; /* all information elements from the last Beacon or Probe
  89                   * Response frames; note Beacon frame is not allowed to
  90                   * override values from Probe Response */
  91         size_t ies_len;
  92         bool wmm_used;
  93 #ifdef CONFIG_MAC80211_MESH
  94         u8 *mesh_id;
  95         size_t mesh_id_len;
  96         u8 *mesh_cfg;
  97 #endif
  98 #define IEEE80211_MAX_SUPP_RATES 32
  99         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
 100         size_t supp_rates_len;
 101         u64 timestamp;
 102         int beacon_int;
 103
 104         unsigned long last_probe_resp;
 105         unsigned long last_update;
 106
 107         /* during assocation, we save an ERP value from a probe response so
 108          * that we can feed ERP info to the driver when handling the
 109          * association completes. these fields probably won't be up-to-date
 110          * otherwise, you probably don't want to use them. */
 111         int has_erp_value;
 112         u8 erp_value;
 113 };
 114
 115 static inline u8 *bss_mesh_cfg(struct ieee80211_sta_bss *bss)
 116 {
 117 #ifdef CONFIG_MAC80211_MESH
 118         return bss->mesh_cfg;
 119 #endif
 120         return NULL;
 121 }
 122
 123 static inline u8 *bss_mesh_id(struct ieee80211_sta_bss *bss)
 124 {
 125 #ifdef CONFIG_MAC80211_MESH
 126         return bss->mesh_id;
 127 #endif
 128         return NULL;
 129 }
 130
 131 static inline u8 bss_mesh_id_len(struct ieee80211_sta_bss *bss)
 132 {
 133 #ifdef CONFIG_MAC80211_MESH
 134         return bss->mesh_id_len;
 135 #endif
 136         return 0;
 137 }
 138
 139
 140 typedef unsigned __bitwise__ ieee80211_tx_result;
 141 #define TX_CONTINUE     ((__force ieee80211_tx_result) 0u)
 142 #define TX_DROP         ((__force ieee80211_tx_result) 1u)
 143 #define TX_QUEUED       ((__force ieee80211_tx_result) 2u)
 144
 145 #define IEEE80211_TX_FRAGMENTED         BIT(0)
 146 #define IEEE80211_TX_UNICAST            BIT(1)
 147 #define IEEE80211_TX_PS_BUFFERED        BIT(2)
 148 #define IEEE80211_TX_PROBE_LAST_FRAG    BIT(3)
 149
 150 struct ieee80211_tx_data {
 151         struct sk_buff *skb;
 152         struct net_device *dev;
 153         struct ieee80211_local *local;
 154         struct ieee80211_sub_if_data *sdata;
 155         struct sta_info *sta;
 156         struct ieee80211_key *key;
 157
 158         struct ieee80211_channel *channel;
 159         s8 rate_idx;
 160         /* use this rate (if set) for last fragment; rate can
 161          * be set to lower rate for the first fragments, e.g.,
 162          * when using CTS protection with IEEE 802.11g. */
 163         s8 last_frag_rate_idx;
 164
 165         /* Extra fragments (in addition to the first fragment
 166          * in skb) */
 167         struct sk_buff **extra_frag;
 168         int num_extra_frag;
 169
 170         u16 ethertype;
 171         unsigned int flags;
 172 };
 173
 174
 175 typedef unsigned __bitwise__ ieee80211_rx_result;
 176 #define RX_CONTINUE             ((__force ieee80211_rx_result) 0u)
 177 #define RX_DROP_UNUSABLE        ((__force ieee80211_rx_result) 1u)
 178 #define RX_DROP_MONITOR         ((__force ieee80211_rx_result) 2u)
 179 #define RX_QUEUED               ((__force ieee80211_rx_result) 3u)
 180
 181 #define IEEE80211_RX_IN_SCAN            BIT(0)
 182 /* frame is destined to interface currently processed (incl. multicast frames) */
 183 #define IEEE80211_RX_RA_MATCH           BIT(1)
 184 #define IEEE80211_RX_AMSDU              BIT(2)
 185 #define IEEE80211_RX_CMNTR_REPORTED     BIT(3)
 186 #define IEEE80211_RX_FRAGMENTED         BIT(4)
 187
 188 struct ieee80211_rx_data {
 189         struct sk_buff *skb;
 190         struct net_device *dev;
 191         struct ieee80211_local *local;
 192         struct ieee80211_sub_if_data *sdata;
 193         struct sta_info *sta;
 194         struct ieee80211_key *key;
 195         struct ieee80211_rx_status *status;
 196         struct ieee80211_rate *rate;
 197
 198         u16 ethertype;
 199         unsigned int flags;
 200         int sent_ps_buffered;
 201         int queue;
 202         u32 tkip_iv32;
 203         u16 tkip_iv16;
 204 };
 205
 206 struct ieee80211_tx_stored_packet {
 207         struct sk_buff *skb;
 208         struct sk_buff **extra_frag;
 209         s8 last_frag_rate_idx;
 210         int num_extra_frag;
 211         bool last_frag_rate_ctrl_probe;
 212 };
 213
 214 struct beacon_data {
 215         u8 *head, *tail;
 216         int head_len, tail_len;
 217         int dtim_period;
 218 };
 219
 220 struct ieee80211_if_ap {
 221         struct beacon_data *beacon;
 222
 223         struct list_head vlans;
 224
 225         u8 ssid[IEEE80211_MAX_SSID_LEN];
 226         size_t ssid_len;
 227
 228         /* yes, this looks ugly, but guarantees that we can later use
 229          * bitmap_empty :)
 230          * NB: don't touch this bitmap, use sta_info_{set,clear}_tim_bit */
 231         u8 tim[sizeof(unsigned long) * BITS_TO_LONGS(IEEE80211_MAX_AID + 1)];
 232         struct sk_buff_head ps_bc_buf;
 233         atomic_t num_sta_ps; /* number of stations in PS mode */
 234         int dtim_count;
 235         int num_beacons; /* number of TXed beacon frames for this BSS */
 236 };
 237
 238 struct ieee80211_if_wds {
 239         struct sta_info *sta;
 240         u8 remote_addr[ETH_ALEN];
 241 };
 242
 243 struct ieee80211_if_vlan {
 244         struct list_head list;
 245 };
 246
 247 struct mesh_stats {
 248         __u32 fwded_frames;             /* Mesh forwarded frames */
 249         __u32 dropped_frames_ttl;       /* Not transmitted since mesh_ttl == 0*/
 250         __u32 dropped_frames_no_route;  /* Not transmitted, no route found */
 251         atomic_t estab_plinks;
 252 };
 253
 254 #define PREQ_Q_F_START          0x1
 255 #define PREQ_Q_F_REFRESH        0x2
 256 struct mesh_preq_queue {
 257         struct list_head list;
 258         u8 dst[ETH_ALEN];
 259         u8 flags;
 260 };
 261
 262 struct mesh_config {
 263         /* Timeouts in ms */
 264         /* Mesh plink management parameters */
 265         u16 dot11MeshRetryTimeout;
 266         u16 dot11MeshConfirmTimeout;
 267         u16 dot11MeshHoldingTimeout;
 268         u16 dot11MeshMaxPeerLinks;
 269         u8  dot11MeshMaxRetries;
 270         u8  dot11MeshTTL;
 271         bool auto_open_plinks;
 272         /* HWMP parameters */
 273         u8  dot11MeshHWMPmaxPREQretries;
 274         u32 path_refresh_time;
 275         u16 min_discovery_timeout;
 276         u32 dot11MeshHWMPactivePathTimeout;
 277         u16 dot11MeshHWMPpreqMinInterval;
 278         u16 dot11MeshHWMPnetDiameterTraversalTime;
 279 };
 280
 281
 282 /* flags used in struct ieee80211_if_sta.flags */
 283 #define IEEE80211_STA_SSID_SET          BIT(0)
 284 #define IEEE80211_STA_BSSID_SET         BIT(1)
 285 #define IEEE80211_STA_PREV_BSSID_SET    BIT(2)
 286 #define IEEE80211_STA_AUTHENTICATED     BIT(3)
 287 #define IEEE80211_STA_ASSOCIATED        BIT(4)
 288 #define IEEE80211_STA_PROBEREQ_POLL     BIT(5)
 289 #define IEEE80211_STA_CREATE_IBSS       BIT(6)
 290 #define IEEE80211_STA_MIXED_CELL        BIT(7)
 291 #define IEEE80211_STA_WMM_ENABLED       BIT(8)
 292 #define IEEE80211_STA_AUTO_SSID_SEL     BIT(10)
 293 #define IEEE80211_STA_AUTO_BSSID_SEL    BIT(11)
 294 #define IEEE80211_STA_AUTO_CHANNEL_SEL  BIT(12)
 295 #define IEEE80211_STA_PRIVACY_INVOKED   BIT(13)
 296 /* flags for  MLME request*/
 297 #define IEEE80211_STA_REQ_SCAN 0
 298 #define IEEE80211_STA_REQ_DIRECT_PROBE 1
 299 #define IEEE80211_STA_REQ_AUTH 2
 300 #define IEEE80211_STA_REQ_RUN  3
 301
 302 /* flags used for setting mlme state */
 303 enum ieee80211_sta_mlme_state {
 304         IEEE80211_STA_MLME_DISABLED,
 305         IEEE80211_STA_MLME_DIRECT_PROBE,
 306         IEEE80211_STA_MLME_AUTHENTICATE,
 307         IEEE80211_STA_MLME_ASSOCIATE,
 308         IEEE80211_STA_MLME_ASSOCIATED,
 309         IEEE80211_STA_MLME_IBSS_SEARCH,
 310         IEEE80211_STA_MLME_IBSS_JOINED,
 311         IEEE80211_STA_MLME_MESH_UP
 312 };
 313
 314 /* bitfield of allowed auth algs */
 315 #define IEEE80211_AUTH_ALG_OPEN BIT(0)
 316 #define IEEE80211_AUTH_ALG_SHARED_KEY BIT(1)
 317 #define IEEE80211_AUTH_ALG_LEAP BIT(2)
 318
 319 struct ieee80211_if_sta {
 320         struct timer_list timer;
 321         struct work_struct work;
 322         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
 323         u8 ssid[IEEE80211_MAX_SSID_LEN];
 324         enum ieee80211_sta_mlme_state state;
 325         size_t ssid_len;
 326         u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
 327         size_t scan_ssid_len;
 328 #ifdef CONFIG_MAC80211_MESH
 329         struct timer_list mesh_path_timer;
 330         u8 mesh_id[IEEE80211_MAX_MESH_ID_LEN];
 331         size_t mesh_id_len;
 332         /* Active Path Selection Protocol Identifier */
 333         u8 mesh_pp_id[4];
 334         /* Active Path Selection Metric Identifier */
 335         u8 mesh_pm_id[4];
 336         /* Congestion Control Mode Identifier */
 337         u8 mesh_cc_id[4];
 338         /* Local mesh Destination Sequence Number */
 339         u32 dsn;
 340         /* Last used PREQ ID */
 341         u32 preq_id;
 342         atomic_t mpaths;
 343         /* Timestamp of last DSN update */
 344         unsigned long last_dsn_update;
 345         /* Timestamp of last DSN sent */
 346         unsigned long last_preq;
 347         struct mesh_rmc *rmc;
 348         spinlock_t mesh_preq_queue_lock;
 349         struct mesh_preq_queue preq_queue;
 350         int preq_queue_len;
 351         struct mesh_stats mshstats;
 352         struct mesh_config mshcfg;
 353         u32 mesh_seqnum;
 354         bool accepting_plinks;
 355 #endif
 356         u16 aid;
 357         u16 ap_capab, capab;
 358         u8 *extra_ie; /* to be added to the end of AssocReq */
 359         size_t extra_ie_len;
 360
 361         /* The last AssocReq/Resp IEs */
 362         u8 *assocreq_ies, *assocresp_ies;
 363         size_t assocreq_ies_len, assocresp_ies_len;
 364
 365         struct sk_buff_head skb_queue;
 366
 367         int assoc_scan_tries; /* number of scans done pre-association */
 368         int direct_probe_tries; /* retries for direct probes */
 369         int auth_tries; /* retries for auth req */
 370         int assoc_tries; /* retries for assoc req */
 371
 372         unsigned long request;
 373
 374         unsigned long last_probe;
 375
 376         unsigned int flags;
 377
 378         unsigned int auth_algs; /* bitfield of allowed auth algs */
 379         int auth_alg; /* currently used IEEE 802.11 authentication algorithm */
 380         int auth_transaction;
 381
 382         unsigned long ibss_join_req;
 383         struct sk_buff *probe_resp; /* ProbeResp template for IBSS */
 384         u32 supp_rates_bits[IEEE80211_NUM_BANDS];
 385
 386         int wmm_last_param_set;
 387         int num_beacons; /* number of TXed beacon frames by this STA */
 388 };
 389
 390 static inline void ieee80211_if_sta_set_mesh_id(struct ieee80211_if_sta *ifsta,
 391                                                 u8 mesh_id_len, u8 *mesh_id)
 392 {
 393 #ifdef CONFIG_MAC80211_MESH
 394         ifsta->mesh_id_len = mesh_id_len;
 395         memcpy(ifsta->mesh_id, mesh_id, mesh_id_len);
 396 #endif
 397 }
 398
 399 #ifdef CONFIG_MAC80211_MESH
 400 #define IEEE80211_IFSTA_MESH_CTR_INC(sta, name) \
 401         do { (sta)->mshstats.name++; } while (0)
 402 #else
 403 #define IEEE80211_IFSTA_MESH_CTR_INC(sta, name) \
 404         do { } while (0)
 405 #endif
 406
 407 /* flags used in struct ieee80211_sub_if_data.flags */
 408 #define IEEE80211_SDATA_ALLMULTI        BIT(0)
 409 #define IEEE80211_SDATA_PROMISC         BIT(1)
 410 #define IEEE80211_SDATA_USERSPACE_MLME  BIT(2)
 411 #define IEEE80211_SDATA_OPERATING_GMODE BIT(3)
 412 struct ieee80211_sub_if_data {
 413         struct list_head list;
 414
 415         struct wireless_dev wdev;
 416
 417         /* keys */
 418         struct list_head key_list;
 419
 420         struct net_device *dev;
 421         struct ieee80211_local *local;
 422
 423         unsigned int flags;
 424
 425         int drop_unencrypted;
 426
 427         /*
 428          * basic rates of this AP or the AP we're associated to
 429          */
 430         u64 basic_rates;
 431
 432         /* Fragment table for host-based reassembly */
 433         struct ieee80211_fragment_entry fragments[IEEE80211_FRAGMENT_MAX];
 434         unsigned int fragment_next;
 435
 436 #define NUM_DEFAULT_KEYS 4
 437         struct ieee80211_key *keys[NUM_DEFAULT_KEYS];
 438         struct ieee80211_key *default_key;
 439
 440         /* BSS configuration for this interface. */
 441         struct ieee80211_bss_conf bss_conf;
 442
 443         /*
 444          * AP this belongs to: self in AP mode and
 445          * corresponding AP in VLAN mode, NULL for
 446          * all others (might be needed later in IBSS)
 447          */
 448         struct ieee80211_if_ap *bss;
 449
 450         int force_unicast_rateidx; /* forced TX rateidx for unicast frames */
 451         int max_ratectrl_rateidx; /* max TX rateidx for rate control */
 452
 453         union {
 454                 struct ieee80211_if_ap ap;
 455                 struct ieee80211_if_wds wds;
 456                 struct ieee80211_if_vlan vlan;
 457                 struct ieee80211_if_sta sta;
 458                 u32 mntr_flags;
 459         } u;
 460
 461 #ifdef CONFIG_MAC80211_DEBUGFS
 462         struct dentry *debugfsdir;
 463         union {
 464                 struct {
 465                         struct dentry *drop_unencrypted;
 466                         struct dentry *state;
 467                         struct dentry *bssid;
 468                         struct dentry *prev_bssid;
 469                         struct dentry *ssid_len;
 470                         struct dentry *aid;
 471                         struct dentry *ap_capab;
 472                         struct dentry *capab;
 473                         struct dentry *extra_ie_len;
 474                         struct dentry *auth_tries;
 475                         struct dentry *assoc_tries;
 476                         struct dentry *auth_algs;
 477                         struct dentry *auth_alg;
 478                         struct dentry *auth_transaction;
 479                         struct dentry *flags;
 480                         struct dentry *num_beacons_sta;
 481                         struct dentry *force_unicast_rateidx;
 482                         struct dentry *max_ratectrl_rateidx;
 483                 } sta;
 484                 struct {
 485                         struct dentry *drop_unencrypted;
 486                         struct dentry *num_sta_ps;
 487                         struct dentry *dtim_count;
 488                         struct dentry *num_beacons;
 489                         struct dentry *force_unicast_rateidx;
 490                         struct dentry *max_ratectrl_rateidx;
 491                         struct dentry *num_buffered_multicast;
 492                 } ap;
 493                 struct {
 494                         struct dentry *drop_unencrypted;
 495                         struct dentry *peer;
 496                         struct dentry *force_unicast_rateidx;
 497                         struct dentry *max_ratectrl_rateidx;
 498                 } wds;
 499                 struct {
 500                         struct dentry *drop_unencrypted;
 501                         struct dentry *force_unicast_rateidx;
 502                         struct dentry *max_ratectrl_rateidx;
 503                 } vlan;
 504                 struct {
 505                         struct dentry *mode;
 506                 } monitor;
 507         } debugfs;
 508         struct {
 509                 struct dentry *default_key;
 510         } common_debugfs;
 511
 512 #ifdef CONFIG_MAC80211_MESH
 513         struct dentry *mesh_stats_dir;
 514         struct {
 515                 struct dentry *fwded_frames;
 516                 struct dentry *dropped_frames_ttl;
 517                 struct dentry *dropped_frames_no_route;
 518                 struct dentry *estab_plinks;
 519                 struct timer_list mesh_path_timer;
 520         } mesh_stats;
 521
 522         struct dentry *mesh_config_dir;
 523         struct {
 524                 struct dentry *dot11MeshRetryTimeout;
 525                 struct dentry *dot11MeshConfirmTimeout;
 526                 struct dentry *dot11MeshHoldingTimeout;
 527                 struct dentry *dot11MeshMaxRetries;
 528                 struct dentry *dot11MeshTTL;
 529                 struct dentry *auto_open_plinks;
 530                 struct dentry *dot11MeshMaxPeerLinks;
 531                 struct dentry *dot11MeshHWMPactivePathTimeout;
 532                 struct dentry *dot11MeshHWMPpreqMinInterval;
 533                 struct dentry *dot11MeshHWMPnetDiameterTraversalTime;
 534                 struct dentry *dot11MeshHWMPmaxPREQretries;
 535                 struct dentry *path_refresh_time;
 536                 struct dentry *min_discovery_timeout;
 537         } mesh_config;
 538 #endif
 539
 540 #endif
 541         /* must be last, dynamically sized area in this! */
 542         struct ieee80211_vif vif;
 543 };
 544
 545 static inline
 546 struct ieee80211_sub_if_data *vif_to_sdata(struct ieee80211_vif *p)
 547 {
 548         return container_of(p, struct ieee80211_sub_if_data, vif);
 549 }
 550
 551 enum {
 552         IEEE80211_RX_MSG        = 1,
 553         IEEE80211_TX_STATUS_MSG = 2,
 554         IEEE80211_DELBA_MSG     = 3,
 555         IEEE80211_ADDBA_MSG     = 4,
 556 };
 557
 558 /* maximum number of hardware queues we support. */
 559 #define QD_MAX_QUEUES (IEEE80211_MAX_AMPDU_QUEUES + IEEE80211_MAX_QUEUES)
 560
 561 struct ieee80211_local {
 562         /* embed the driver visible part.
 563          * don't cast (use the static inlines below), but we keep
 564          * it first anyway so they become a no-op */
 565         struct ieee80211_hw hw;
 566
 567         const struct ieee80211_ops *ops;
 568
 569         unsigned long queue_pool[BITS_TO_LONGS(QD_MAX_QUEUES)];
 570
 571         struct net_device *mdev; /* wmaster# - "master" 802.11 device */
 572         int open_count;
 573         int monitors, cooked_mntrs;
 574         /* number of interfaces with corresponding FIF_ flags */
 575         int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss;
 576         unsigned int filter_flags; /* FIF_* */
 577         struct iw_statistics wstats;
 578         u8 wstats_flags;
 579         bool tim_in_locked_section; /* see ieee80211_beacon_get() */
 580         int tx_headroom; /* required headroom for hardware/radiotap */
 581
 582         /* Tasklet and skb queue to process calls from IRQ mode. All frames
 583          * added to skb_queue will be processed, but frames in
 584          * skb_queue_unreliable may be dropped if the total length of these
 585          * queues increases over the limit. */
 586 #define IEEE80211_IRQSAFE_QUEUE_LIMIT 128
 587         struct tasklet_struct tasklet;
 588         struct sk_buff_head skb_queue;
 589         struct sk_buff_head skb_queue_unreliable;
 590
 591         /* Station data */
 592         /*
 593          * The lock only protects the list, hash, timer and counter
 594          * against manipulation, reads are done in RCU. Additionally,
 595          * the lock protects each BSS's TIM bitmap.
 596          */
 597         spinlock_t sta_lock;
 598         unsigned long num_sta;
 599         struct list_head sta_list;
 600         struct list_head sta_flush_list;
 601         struct work_struct sta_flush_work;
 602         struct sta_info *sta_hash[STA_HASH_SIZE];
 603         struct timer_list sta_cleanup;
 604
 605         unsigned long queues_pending[BITS_TO_LONGS(IEEE80211_MAX_QUEUES)];
 606         unsigned long queues_pending_run[BITS_TO_LONGS(IEEE80211_MAX_QUEUES)];
 607         struct ieee80211_tx_stored_packet pending_packet[IEEE80211_MAX_QUEUES];
 608         struct tasklet_struct tx_pending_tasklet;
 609
 610         /* number of interfaces with corresponding IFF_ flags */
 611         atomic_t iff_allmultis, iff_promiscs;
 612
 613         struct rate_control_ref *rate_ctrl;
 614
 615         int rts_threshold;
 616         int fragmentation_threshold;
 617         int short_retry_limit; /* dot11ShortRetryLimit */
 618         int long_retry_limit; /* dot11LongRetryLimit */
 619
 620         struct crypto_blkcipher *wep_tx_tfm;
 621         struct crypto_blkcipher *wep_rx_tfm;
 622         u32 wep_iv;
 623
 624         int bridge_packets; /* bridge packets between associated stations and
 625                              * deliver multicast frames both back to wireless
 626                              * media and to the local net stack */
 627
 628         struct list_head interfaces;
 629
 630         /*
 631          * Key lock, protects sdata's key_list and sta_info's
 632          * key pointers (write access, they're RCU.)
 633          */
 634         spinlock_t key_lock;
 635
 636
 637         bool sta_sw_scanning;
 638         bool sta_hw_scanning;
 639         int scan_channel_idx;
 640         enum ieee80211_band scan_band;
 641
 642         enum { SCAN_SET_CHANNEL, SCAN_SEND_PROBE } scan_state;
 643         unsigned long last_scan_completed;
 644         struct delayed_work scan_work;
 645         struct ieee80211_sub_if_data *scan_sdata;
 646         struct ieee80211_channel *oper_channel, *scan_channel;
 647         u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
 648         size_t scan_ssid_len;
 649         struct list_head sta_bss_list;
 650         struct ieee80211_sta_bss *sta_bss_hash[STA_HASH_SIZE];
 651         spinlock_t sta_bss_lock;
 652
 653         /* SNMP counters */
 654         /* dot11CountersTable */
 655         u32 dot11TransmittedFragmentCount;
 656         u32 dot11MulticastTransmittedFrameCount;
 657         u32 dot11FailedCount;
 658         u32 dot11RetryCount;
 659         u32 dot11MultipleRetryCount;
 660         u32 dot11FrameDuplicateCount;
 661         u32 dot11ReceivedFragmentCount;
 662         u32 dot11MulticastReceivedFrameCount;
 663         u32 dot11TransmittedFrameCount;
 664         u32 dot11WEPUndecryptableCount;
 665
 666 #ifdef CONFIG_MAC80211_LEDS
 667         int tx_led_counter, rx_led_counter;
 668         struct led_trigger *tx_led, *rx_led, *assoc_led, *radio_led;
 669         char tx_led_name[32], rx_led_name[32],
 670              assoc_led_name[32], radio_led_name[32];
 671 #endif
 672
 673 #ifdef CONFIG_MAC80211_DEBUGFS
 674         struct work_struct sta_debugfs_add;
 675 #endif
 676
 677 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 678         /* TX/RX handler statistics */
 679         unsigned int tx_handlers_drop;
 680         unsigned int tx_handlers_queued;
 681         unsigned int tx_handlers_drop_unencrypted;
 682         unsigned int tx_handlers_drop_fragment;
 683         unsigned int tx_handlers_drop_wep;
 684         unsigned int tx_handlers_drop_not_assoc;
 685         unsigned int tx_handlers_drop_unauth_port;
 686         unsigned int rx_handlers_drop;
 687         unsigned int rx_handlers_queued;
 688         unsigned int rx_handlers_drop_nullfunc;
 689         unsigned int rx_handlers_drop_defrag;
 690         unsigned int rx_handlers_drop_short;
 691         unsigned int rx_handlers_drop_passive_scan;
 692         unsigned int tx_expand_skb_head;
 693         unsigned int tx_expand_skb_head_cloned;
 694         unsigned int rx_expand_skb_head;
 695         unsigned int rx_expand_skb_head2;
 696         unsigned int rx_handlers_fragments;
 697         unsigned int tx_status_drop;
 698 #define I802_DEBUG_INC(c) (c)++
 699 #else /* CONFIG_MAC80211_DEBUG_COUNTERS */
 700 #define I802_DEBUG_INC(c) do { } while (0)
 701 #endif /* CONFIG_MAC80211_DEBUG_COUNTERS */
 702
 703
 704         int total_ps_buffered; /* total number of all buffered unicast and
 705                                 * multicast packets for power saving stations
 706                                 */
 707         int wifi_wme_noack_test;
 708         unsigned int wmm_acm; /* bit field of ACM bits (BIT(802.1D tag)) */
 709
 710 #ifdef CONFIG_MAC80211_DEBUGFS
 711         struct local_debugfsdentries {
 712                 struct dentry *frequency;
 713                 struct dentry *antenna_sel_tx;
 714                 struct dentry *antenna_sel_rx;
 715                 struct dentry *bridge_packets;
 716                 struct dentry *rts_threshold;
 717                 struct dentry *fragmentation_threshold;
 718                 struct dentry *short_retry_limit;
 719                 struct dentry *long_retry_limit;
 720                 struct dentry *total_ps_buffered;
 721                 struct dentry *wep_iv;
 722                 struct dentry *statistics;
 723                 struct local_debugfsdentries_statsdentries {
 724                         struct dentry *transmitted_fragment_count;
 725                         struct dentry *multicast_transmitted_frame_count;
 726                         struct dentry *failed_count;
 727                         struct dentry *retry_count;
 728                         struct dentry *multiple_retry_count;
 729                         struct dentry *frame_duplicate_count;
 730                         struct dentry *received_fragment_count;
 731                         struct dentry *multicast_received_frame_count;
 732                         struct dentry *transmitted_frame_count;
 733                         struct dentry *wep_undecryptable_count;
 734                         struct dentry *num_scans;
 735 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 736                         struct dentry *tx_handlers_drop;
 737                         struct dentry *tx_handlers_queued;
 738                         struct dentry *tx_handlers_drop_unencrypted;
 739                         struct dentry *tx_handlers_drop_fragment;
 740                         struct dentry *tx_handlers_drop_wep;
 741                         struct dentry *tx_handlers_drop_not_assoc;
 742                         struct dentry *tx_handlers_drop_unauth_port;
 743                         struct dentry *rx_handlers_drop;
 744                         struct dentry *rx_handlers_queued;
 745                         struct dentry *rx_handlers_drop_nullfunc;
 746                         struct dentry *rx_handlers_drop_defrag;
 747                         struct dentry *rx_handlers_drop_short;
 748                         struct dentry *rx_handlers_drop_passive_scan;
 749                         struct dentry *tx_expand_skb_head;
 750                         struct dentry *tx_expand_skb_head_cloned;
 751                         struct dentry *rx_expand_skb_head;
 752                         struct dentry *rx_expand_skb_head2;
 753                         struct dentry *rx_handlers_fragments;
 754                         struct dentry *tx_status_drop;
 755 #endif
 756                         struct dentry *dot11ACKFailureCount;
 757                         struct dentry *dot11RTSFailureCount;
 758                         struct dentry *dot11FCSErrorCount;
 759                         struct dentry *dot11RTSSuccessCount;
 760                 } stats;
 761                 struct dentry *stations;
 762                 struct dentry *keys;
 763         } debugfs;
 764 #endif
 765 };
 766
 767 static inline struct ieee80211_sub_if_data *
 768 IEEE80211_DEV_TO_SUB_IF(struct net_device *dev)
 769 {
 770         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 771
 772         BUG_ON(!local || local->mdev == dev);
 773
 774         return netdev_priv(dev);
 775 }
 776
 777 /* this struct represents 802.11n's RA/TID combination */
 778 struct ieee80211_ra_tid {
 779         u8 ra[ETH_ALEN];
 780         u16 tid;
 781 };
 782
 783 /* Parsed Information Elements */
 784 struct ieee802_11_elems {
 785         u8 *ie_start;
 786         size_t total_len;
 787
 788         /* pointers to IEs */
 789         u8 *ssid;
 790         u8 *supp_rates;
 791         u8 *fh_params;
 792         u8 *ds_params;
 793         u8 *cf_params;
 794         u8 *tim;
 795         u8 *ibss_params;
 796         u8 *challenge;
 797         u8 *wpa;
 798         u8 *rsn;
 799         u8 *erp_info;
 800         u8 *ext_supp_rates;
 801         u8 *wmm_info;
 802         u8 *wmm_param;
 803         u8 *ht_cap_elem;
 804         u8 *ht_info_elem;
 805         u8 *mesh_config;
 806         u8 *mesh_id;
 807         u8 *peer_link;
 808         u8 *preq;
 809         u8 *prep;
 810         u8 *perr;
 811         u8 *ch_switch_elem;
 812         u8 *country_elem;
 813         u8 *pwr_constr_elem;
 814         u8 *quiet_elem;         /* first quite element */
 815
 816         /* length of them, respectively */
 817         u8 ssid_len;
 818         u8 supp_rates_len;
 819         u8 fh_params_len;
 820         u8 ds_params_len;
 821         u8 cf_params_len;
 822         u8 tim_len;
 823         u8 ibss_params_len;
 824         u8 challenge_len;
 825         u8 wpa_len;
 826         u8 rsn_len;
 827         u8 erp_info_len;
 828         u8 ext_supp_rates_len;
 829         u8 wmm_info_len;
 830         u8 wmm_param_len;
 831         u8 ht_cap_elem_len;
 832         u8 ht_info_elem_len;
 833         u8 mesh_config_len;
 834         u8 mesh_id_len;
 835         u8 peer_link_len;
 836         u8 preq_len;
 837         u8 prep_len;
 838         u8 perr_len;
 839         u8 ch_switch_elem_len;
 840         u8 country_elem_len;
 841         u8 pwr_constr_elem_len;
 842         u8 quiet_elem_len;
 843         u8 num_of_quiet_elem;   /* can be more the one */
 844 };
 845
 846 static inline struct ieee80211_local *hw_to_local(
 847         struct ieee80211_hw *hw)
 848 {
 849         return container_of(hw, struct ieee80211_local, hw);
 850 }
 851
 852 static inline struct ieee80211_hw *local_to_hw(
 853         struct ieee80211_local *local)
 854 {
 855         return &local->hw;
 856 }
 857
 858 struct sta_attribute {
 859         struct attribute attr;
 860         ssize_t (*show)(const struct sta_info *, char *buf);
 861         ssize_t (*store)(struct sta_info *, const char *buf, size_t count);
 862 };
 863
 864 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
 865 {
 866         return compare_ether_addr(raddr, addr) == 0 ||
 867                is_broadcast_ether_addr(raddr);
 868 }
 869
 870
 871 /* ieee80211.c */
 872 int ieee80211_hw_config(struct ieee80211_local *local);
 873 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed);
 874 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx);
 875 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 876                         struct ieee80211_ht_info *req_ht_cap,
 877                         struct ieee80211_ht_bss_info *req_bss_cap);
 878
 879 /* ieee80211_ioctl.c */
 880 extern const struct iw_handler_def ieee80211_iw_handler_def;
 881 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freq);
 882
 883 /* ieee80211_sta.c */
 884 void ieee80211_sta_timer(unsigned long data);
 885 void ieee80211_sta_work(struct work_struct *work);
 886 void ieee80211_sta_scan_work(struct work_struct *work);
 887 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 888                            struct ieee80211_rx_status *rx_status);
 889 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len);
 890 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len);
 891 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid);
 892 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len);
 893 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
 894                             struct ieee80211_if_sta *ifsta);
 895 int ieee80211_sta_scan_results(struct ieee80211_local *local,
 896                                struct iw_request_info *info,
 897                                char *buf, size_t len);
 898 ieee80211_rx_result ieee80211_sta_rx_scan(
 899         struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 900         struct ieee80211_rx_status *rx_status);
 901 void ieee80211_rx_bss_list_init(struct ieee80211_local *local);
 902 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local);
 903 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len);
 904 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 905                                         struct sk_buff *skb, u8 *bssid,
 906                                         u8 *addr, u64 supp_rates);
 907 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason);
 908 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason);
 909 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 910                                       u32 changed);
 911 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata);
 912 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
 913                                    struct ieee80211_ht_info *ht_info);
 914 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
 915                         struct ieee80211_ht_addt_info *ht_add_info_ie,
 916                         struct ieee80211_ht_bss_info *bss_info);
 917 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
 918                                   u16 tid, u8 dialog_token, u16 start_seq_num,
 919                                   u16 agg_size, u16 timeout);
 920 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
 921                                 u16 initiator, u16 reason_code);
 922 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn);
 923
 924 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *da,
 925                                 u16 tid, u16 initiator, u16 reason);
 926 void sta_addba_resp_timer_expired(unsigned long data);
 927 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr);
 928 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
 929                             struct ieee802_11_elems *elems,
 930                             enum ieee80211_band band);
 931 void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 932                 int encrypt);
 933 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 934                               u8 *ssid, size_t ssid_len);
 935 void ieee802_11_parse_elems(u8 *start, size_t len,
 936                             struct ieee802_11_elems *elems);
 937 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local);
 938 int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
 939                              u8 *ssid, size_t ssid_len);
 940 struct ieee80211_sta_bss *
 941 ieee80211_bss_info_update(struct ieee80211_local *local,
 942                           struct ieee80211_rx_status *rx_status,
 943                           struct ieee80211_mgmt *mgmt,
 944                           size_t len,
 945                           struct ieee802_11_elems *elems,
 946                           int freq, bool beacon);
 947 struct ieee80211_sta_bss *
 948 ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
 949                      u8 *ssid, u8 ssid_len);
 950 struct ieee80211_sta_bss *
 951 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
 952                      u8 *ssid, u8 ssid_len);
 953 void ieee80211_rx_bss_put(struct ieee80211_local *local,
 954                           struct ieee80211_sta_bss *bss);
 955
 956 #ifdef CONFIG_MAC80211_MESH
 957 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
 958 #else
 959 static inline void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 960 {}
 961 #endif
 962
 963 /* interface handling */
 964 void ieee80211_if_setup(struct net_device *dev);
 965 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 966                      struct net_device **new_dev, enum ieee80211_if_types type,
 967                      struct vif_params *params);
 968 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 969                              enum ieee80211_if_types type);
 970 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata);
 971 void ieee80211_remove_interfaces(struct ieee80211_local *local);
 972
 973 /* tx handling */
 974 void ieee80211_clear_tx_pending(struct ieee80211_local *local);
 975 void ieee80211_tx_pending(unsigned long data);
 976 int ieee80211_master_start_xmit(struct sk_buff *skb, struct net_device *dev);
 977 int ieee80211_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev);
 978 int ieee80211_subif_start_xmit(struct sk_buff *skb, struct net_device *dev);
 979
 980 /* utility functions/constants */
 981 extern void *mac80211_wiphy_privid; /* for wiphy privid */
 982 extern const unsigned char rfc1042_header[6];
 983 extern const unsigned char bridge_tunnel_header[6];
 984 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
 985                         enum ieee80211_if_types type);
 986 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 987                              int rate, int erp, int short_preamble);
 988 void mac80211_ev_michael_mic_failure(struct ieee80211_sub_if_data *sdata, int keyidx,
 989                                      struct ieee80211_hdr *hdr);
 990 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata);
 991
 992 #ifdef CONFIG_MAC80211_NOINLINE
 993 #define debug_noinline noinline
 994 #else
 995 #define debug_noinline
 996 #endif
 997
 998 #endif /* IEEE80211_I_H */