| 1 | /* |
| 2 | * BSS client mode implementation |
| 3 | * Copyright 2003-2008, Jouni Malinen <j@w1.fi> |
| 4 | * Copyright 2004, Instant802 Networks, Inc. |
| 5 | * Copyright 2005, Devicescape Software, Inc. |
| 6 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 7 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/if_ether.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/if_arp.h> |
| 18 | #include <linux/etherdevice.h> |
| 19 | #include <linux/rtnetlink.h> |
| 20 | #include <linux/pm_qos_params.h> |
| 21 | #include <linux/crc32.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <net/mac80211.h> |
| 24 | #include <asm/unaligned.h> |
| 25 | |
| 26 | #include "ieee80211_i.h" |
| 27 | #include "driver-ops.h" |
| 28 | #include "rate.h" |
| 29 | #include "led.h" |
| 30 | |
| 31 | #define IEEE80211_MAX_PROBE_TRIES 5 |
| 32 | |
| 33 | /* |
| 34 | * beacon loss detection timeout |
| 35 | * XXX: should depend on beacon interval |
| 36 | */ |
| 37 | #define IEEE80211_BEACON_LOSS_TIME (2 * HZ) |
| 38 | /* |
| 39 | * Time the connection can be idle before we probe |
| 40 | * it to see if we can still talk to the AP. |
| 41 | */ |
| 42 | #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) |
| 43 | /* |
| 44 | * Time we wait for a probe response after sending |
| 45 | * a probe request because of beacon loss or for |
| 46 | * checking the connection still works. |
| 47 | */ |
| 48 | #define IEEE80211_PROBE_WAIT (HZ / 2) |
| 49 | |
| 50 | #define TMR_RUNNING_TIMER 0 |
| 51 | #define TMR_RUNNING_CHANSW 1 |
| 52 | |
| 53 | /* |
| 54 | * All cfg80211 functions have to be called outside a locked |
| 55 | * section so that they can acquire a lock themselves... This |
| 56 | * is much simpler than queuing up things in cfg80211, but we |
| 57 | * do need some indirection for that here. |
| 58 | */ |
| 59 | enum rx_mgmt_action { |
| 60 | /* no action required */ |
| 61 | RX_MGMT_NONE, |
| 62 | |
| 63 | /* caller must call cfg80211_send_rx_auth() */ |
| 64 | RX_MGMT_CFG80211_AUTH, |
| 65 | |
| 66 | /* caller must call cfg80211_send_rx_assoc() */ |
| 67 | RX_MGMT_CFG80211_ASSOC, |
| 68 | |
| 69 | /* caller must call cfg80211_send_deauth() */ |
| 70 | RX_MGMT_CFG80211_DEAUTH, |
| 71 | |
| 72 | /* caller must call cfg80211_send_disassoc() */ |
| 73 | RX_MGMT_CFG80211_DISASSOC, |
| 74 | |
| 75 | /* caller must tell cfg80211 about internal error */ |
| 76 | RX_MGMT_CFG80211_ASSOC_ERROR, |
| 77 | }; |
| 78 | |
| 79 | /* utils */ |
| 80 | static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) |
| 81 | { |
| 82 | WARN_ON(!mutex_is_locked(&ifmgd->mtx)); |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * We can have multiple work items (and connection probing) |
| 87 | * scheduling this timer, but we need to take care to only |
| 88 | * reschedule it when it should fire _earlier_ than it was |
| 89 | * asked for before, or if it's not pending right now. This |
| 90 | * function ensures that. Note that it then is required to |
| 91 | * run this function for all timeouts after the first one |
| 92 | * has happened -- the work that runs from this timer will |
| 93 | * do that. |
| 94 | */ |
| 95 | static void run_again(struct ieee80211_if_managed *ifmgd, |
| 96 | unsigned long timeout) |
| 97 | { |
| 98 | ASSERT_MGD_MTX(ifmgd); |
| 99 | |
| 100 | if (!timer_pending(&ifmgd->timer) || |
| 101 | time_before(timeout, ifmgd->timer.expires)) |
| 102 | mod_timer(&ifmgd->timer, timeout); |
| 103 | } |
| 104 | |
| 105 | static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata) |
| 106 | { |
| 107 | if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) |
| 108 | return; |
| 109 | |
| 110 | mod_timer(&sdata->u.mgd.bcn_mon_timer, |
| 111 | round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME)); |
| 112 | } |
| 113 | |
| 114 | static int ecw2cw(int ecw) |
| 115 | { |
| 116 | return (1 << ecw) - 1; |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * ieee80211_enable_ht should be called only after the operating band |
| 121 | * has been determined as ht configuration depends on the hw's |
| 122 | * HT abilities for a specific band. |
| 123 | */ |
| 124 | static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, |
| 125 | struct ieee80211_ht_info *hti, |
| 126 | const u8 *bssid, u16 ap_ht_cap_flags) |
| 127 | { |
| 128 | struct ieee80211_local *local = sdata->local; |
| 129 | struct ieee80211_supported_band *sband; |
| 130 | struct sta_info *sta; |
| 131 | u32 changed = 0; |
| 132 | u16 ht_opmode; |
| 133 | bool enable_ht = true, ht_changed; |
| 134 | enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; |
| 135 | |
| 136 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
| 137 | |
| 138 | /* HT is not supported */ |
| 139 | if (!sband->ht_cap.ht_supported) |
| 140 | enable_ht = false; |
| 141 | |
| 142 | /* check that channel matches the right operating channel */ |
| 143 | if (local->hw.conf.channel->center_freq != |
| 144 | ieee80211_channel_to_frequency(hti->control_chan)) |
| 145 | enable_ht = false; |
| 146 | |
| 147 | if (enable_ht) { |
| 148 | channel_type = NL80211_CHAN_HT20; |
| 149 | |
| 150 | if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && |
| 151 | (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && |
| 152 | (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { |
| 153 | switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { |
| 154 | case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: |
| 155 | if (!(local->hw.conf.channel->flags & |
| 156 | IEEE80211_CHAN_NO_HT40PLUS)) |
| 157 | channel_type = NL80211_CHAN_HT40PLUS; |
| 158 | break; |
| 159 | case IEEE80211_HT_PARAM_CHA_SEC_BELOW: |
| 160 | if (!(local->hw.conf.channel->flags & |
| 161 | IEEE80211_CHAN_NO_HT40MINUS)) |
| 162 | channel_type = NL80211_CHAN_HT40MINUS; |
| 163 | break; |
| 164 | } |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | ht_changed = conf_is_ht(&local->hw.conf) != enable_ht || |
| 169 | channel_type != local->hw.conf.channel_type; |
| 170 | |
| 171 | if (local->tmp_channel) |
| 172 | local->tmp_channel_type = channel_type; |
| 173 | local->oper_channel_type = channel_type; |
| 174 | |
| 175 | if (ht_changed) { |
| 176 | /* channel_type change automatically detected */ |
| 177 | ieee80211_hw_config(local, 0); |
| 178 | |
| 179 | rcu_read_lock(); |
| 180 | sta = sta_info_get(sdata, bssid); |
| 181 | if (sta) |
| 182 | rate_control_rate_update(local, sband, sta, |
| 183 | IEEE80211_RC_HT_CHANGED, |
| 184 | local->oper_channel_type); |
| 185 | rcu_read_unlock(); |
| 186 | } |
| 187 | |
| 188 | /* disable HT */ |
| 189 | if (!enable_ht) |
| 190 | return 0; |
| 191 | |
| 192 | ht_opmode = le16_to_cpu(hti->operation_mode); |
| 193 | |
| 194 | /* if bss configuration changed store the new one */ |
| 195 | if (!sdata->ht_opmode_valid || |
| 196 | sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { |
| 197 | changed |= BSS_CHANGED_HT; |
| 198 | sdata->vif.bss_conf.ht_operation_mode = ht_opmode; |
| 199 | sdata->ht_opmode_valid = true; |
| 200 | } |
| 201 | |
| 202 | return changed; |
| 203 | } |
| 204 | |
| 205 | /* frame sending functions */ |
| 206 | |
| 207 | static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, |
| 208 | const u8 *bssid, u16 stype, u16 reason, |
| 209 | void *cookie) |
| 210 | { |
| 211 | struct ieee80211_local *local = sdata->local; |
| 212 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 213 | struct sk_buff *skb; |
| 214 | struct ieee80211_mgmt *mgmt; |
| 215 | |
| 216 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); |
| 217 | if (!skb) { |
| 218 | printk(KERN_DEBUG "%s: failed to allocate buffer for " |
| 219 | "deauth/disassoc frame\n", sdata->name); |
| 220 | return; |
| 221 | } |
| 222 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 223 | |
| 224 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 225 | memset(mgmt, 0, 24); |
| 226 | memcpy(mgmt->da, bssid, ETH_ALEN); |
| 227 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
| 228 | memcpy(mgmt->bssid, bssid, ETH_ALEN); |
| 229 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); |
| 230 | skb_put(skb, 2); |
| 231 | /* u.deauth.reason_code == u.disassoc.reason_code */ |
| 232 | mgmt->u.deauth.reason_code = cpu_to_le16(reason); |
| 233 | |
| 234 | if (stype == IEEE80211_STYPE_DEAUTH) |
| 235 | if (cookie) |
| 236 | __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); |
| 237 | else |
| 238 | cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); |
| 239 | else |
| 240 | if (cookie) |
| 241 | __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); |
| 242 | else |
| 243 | cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); |
| 244 | if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) |
| 245 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
| 246 | ieee80211_tx_skb(sdata, skb); |
| 247 | } |
| 248 | |
| 249 | void ieee80211_send_pspoll(struct ieee80211_local *local, |
| 250 | struct ieee80211_sub_if_data *sdata) |
| 251 | { |
| 252 | struct ieee80211_pspoll *pspoll; |
| 253 | struct sk_buff *skb; |
| 254 | |
| 255 | skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); |
| 256 | if (!skb) |
| 257 | return; |
| 258 | |
| 259 | pspoll = (struct ieee80211_pspoll *) skb->data; |
| 260 | pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); |
| 261 | |
| 262 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
| 263 | ieee80211_tx_skb(sdata, skb); |
| 264 | } |
| 265 | |
| 266 | void ieee80211_send_nullfunc(struct ieee80211_local *local, |
| 267 | struct ieee80211_sub_if_data *sdata, |
| 268 | int powersave) |
| 269 | { |
| 270 | struct sk_buff *skb; |
| 271 | struct ieee80211_hdr_3addr *nullfunc; |
| 272 | |
| 273 | skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); |
| 274 | if (!skb) |
| 275 | return; |
| 276 | |
| 277 | nullfunc = (struct ieee80211_hdr_3addr *) skb->data; |
| 278 | if (powersave) |
| 279 | nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); |
| 280 | |
| 281 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
| 282 | ieee80211_tx_skb(sdata, skb); |
| 283 | } |
| 284 | |
| 285 | static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, |
| 286 | struct ieee80211_sub_if_data *sdata) |
| 287 | { |
| 288 | struct sk_buff *skb; |
| 289 | struct ieee80211_hdr *nullfunc; |
| 290 | __le16 fc; |
| 291 | |
| 292 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) |
| 293 | return; |
| 294 | |
| 295 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); |
| 296 | if (!skb) { |
| 297 | printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " |
| 298 | "nullfunc frame\n", sdata->name); |
| 299 | return; |
| 300 | } |
| 301 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 302 | |
| 303 | nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); |
| 304 | memset(nullfunc, 0, 30); |
| 305 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | |
| 306 | IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
| 307 | nullfunc->frame_control = fc; |
| 308 | memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); |
| 309 | memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); |
| 310 | memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); |
| 311 | memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); |
| 312 | |
| 313 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
| 314 | ieee80211_tx_skb(sdata, skb); |
| 315 | } |
| 316 | |
| 317 | /* spectrum management related things */ |
| 318 | static void ieee80211_chswitch_work(struct work_struct *work) |
| 319 | { |
| 320 | struct ieee80211_sub_if_data *sdata = |
| 321 | container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); |
| 322 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 323 | |
| 324 | if (!ieee80211_sdata_running(sdata)) |
| 325 | return; |
| 326 | |
| 327 | mutex_lock(&ifmgd->mtx); |
| 328 | if (!ifmgd->associated) |
| 329 | goto out; |
| 330 | |
| 331 | sdata->local->oper_channel = sdata->local->csa_channel; |
| 332 | ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL); |
| 333 | |
| 334 | /* XXX: shouldn't really modify cfg80211-owned data! */ |
| 335 | ifmgd->associated->channel = sdata->local->oper_channel; |
| 336 | |
| 337 | ieee80211_wake_queues_by_reason(&sdata->local->hw, |
| 338 | IEEE80211_QUEUE_STOP_REASON_CSA); |
| 339 | out: |
| 340 | ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; |
| 341 | mutex_unlock(&ifmgd->mtx); |
| 342 | } |
| 343 | |
| 344 | static void ieee80211_chswitch_timer(unsigned long data) |
| 345 | { |
| 346 | struct ieee80211_sub_if_data *sdata = |
| 347 | (struct ieee80211_sub_if_data *) data; |
| 348 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 349 | |
| 350 | if (sdata->local->quiescing) { |
| 351 | set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); |
| 352 | return; |
| 353 | } |
| 354 | |
| 355 | ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); |
| 356 | } |
| 357 | |
| 358 | void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, |
| 359 | struct ieee80211_channel_sw_ie *sw_elem, |
| 360 | struct ieee80211_bss *bss) |
| 361 | { |
| 362 | struct cfg80211_bss *cbss = |
| 363 | container_of((void *)bss, struct cfg80211_bss, priv); |
| 364 | struct ieee80211_channel *new_ch; |
| 365 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 366 | int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num); |
| 367 | |
| 368 | ASSERT_MGD_MTX(ifmgd); |
| 369 | |
| 370 | if (!ifmgd->associated) |
| 371 | return; |
| 372 | |
| 373 | if (sdata->local->scanning) |
| 374 | return; |
| 375 | |
| 376 | /* Disregard subsequent beacons if we are already running a timer |
| 377 | processing a CSA */ |
| 378 | |
| 379 | if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) |
| 380 | return; |
| 381 | |
| 382 | new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); |
| 383 | if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) |
| 384 | return; |
| 385 | |
| 386 | sdata->local->csa_channel = new_ch; |
| 387 | |
| 388 | if (sw_elem->count <= 1) { |
| 389 | ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); |
| 390 | } else { |
| 391 | ieee80211_stop_queues_by_reason(&sdata->local->hw, |
| 392 | IEEE80211_QUEUE_STOP_REASON_CSA); |
| 393 | ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; |
| 394 | mod_timer(&ifmgd->chswitch_timer, |
| 395 | jiffies + |
| 396 | msecs_to_jiffies(sw_elem->count * |
| 397 | cbss->beacon_interval)); |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, |
| 402 | u16 capab_info, u8 *pwr_constr_elem, |
| 403 | u8 pwr_constr_elem_len) |
| 404 | { |
| 405 | struct ieee80211_conf *conf = &sdata->local->hw.conf; |
| 406 | |
| 407 | if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) |
| 408 | return; |
| 409 | |
| 410 | /* Power constraint IE length should be 1 octet */ |
| 411 | if (pwr_constr_elem_len != 1) |
| 412 | return; |
| 413 | |
| 414 | if ((*pwr_constr_elem <= conf->channel->max_power) && |
| 415 | (*pwr_constr_elem != sdata->local->power_constr_level)) { |
| 416 | sdata->local->power_constr_level = *pwr_constr_elem; |
| 417 | ieee80211_hw_config(sdata->local, 0); |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | /* powersave */ |
| 422 | static void ieee80211_enable_ps(struct ieee80211_local *local, |
| 423 | struct ieee80211_sub_if_data *sdata) |
| 424 | { |
| 425 | struct ieee80211_conf *conf = &local->hw.conf; |
| 426 | |
| 427 | /* |
| 428 | * If we are scanning right now then the parameters will |
| 429 | * take effect when scan finishes. |
| 430 | */ |
| 431 | if (local->scanning) |
| 432 | return; |
| 433 | |
| 434 | if (conf->dynamic_ps_timeout > 0 && |
| 435 | !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { |
| 436 | mod_timer(&local->dynamic_ps_timer, jiffies + |
| 437 | msecs_to_jiffies(conf->dynamic_ps_timeout)); |
| 438 | } else { |
| 439 | if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) |
| 440 | ieee80211_send_nullfunc(local, sdata, 1); |
| 441 | |
| 442 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
| 443 | (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) |
| 444 | return; |
| 445 | |
| 446 | conf->flags |= IEEE80211_CONF_PS; |
| 447 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | static void ieee80211_change_ps(struct ieee80211_local *local) |
| 452 | { |
| 453 | struct ieee80211_conf *conf = &local->hw.conf; |
| 454 | |
| 455 | if (local->ps_sdata) { |
| 456 | ieee80211_enable_ps(local, local->ps_sdata); |
| 457 | } else if (conf->flags & IEEE80211_CONF_PS) { |
| 458 | conf->flags &= ~IEEE80211_CONF_PS; |
| 459 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); |
| 460 | del_timer_sync(&local->dynamic_ps_timer); |
| 461 | cancel_work_sync(&local->dynamic_ps_enable_work); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | /* need to hold RTNL or interface lock */ |
| 466 | void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) |
| 467 | { |
| 468 | struct ieee80211_sub_if_data *sdata, *found = NULL; |
| 469 | int count = 0; |
| 470 | |
| 471 | if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { |
| 472 | local->ps_sdata = NULL; |
| 473 | return; |
| 474 | } |
| 475 | |
| 476 | if (!list_empty(&local->work_list)) { |
| 477 | local->ps_sdata = NULL; |
| 478 | goto change; |
| 479 | } |
| 480 | |
| 481 | list_for_each_entry(sdata, &local->interfaces, list) { |
| 482 | if (!ieee80211_sdata_running(sdata)) |
| 483 | continue; |
| 484 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| 485 | continue; |
| 486 | found = sdata; |
| 487 | count++; |
| 488 | } |
| 489 | |
| 490 | if (count == 1 && found->u.mgd.powersave && |
| 491 | found->u.mgd.associated && |
| 492 | found->u.mgd.associated->beacon_ies && |
| 493 | !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | |
| 494 | IEEE80211_STA_CONNECTION_POLL))) { |
| 495 | s32 beaconint_us; |
| 496 | |
| 497 | if (latency < 0) |
| 498 | latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY); |
| 499 | |
| 500 | beaconint_us = ieee80211_tu_to_usec( |
| 501 | found->vif.bss_conf.beacon_int); |
| 502 | |
| 503 | if (beaconint_us > latency) { |
| 504 | local->ps_sdata = NULL; |
| 505 | } else { |
| 506 | struct ieee80211_bss *bss; |
| 507 | int maxslp = 1; |
| 508 | u8 dtimper; |
| 509 | |
| 510 | bss = (void *)found->u.mgd.associated->priv; |
| 511 | dtimper = bss->dtim_period; |
| 512 | |
| 513 | /* If the TIM IE is invalid, pretend the value is 1 */ |
| 514 | if (!dtimper) |
| 515 | dtimper = 1; |
| 516 | else if (dtimper > 1) |
| 517 | maxslp = min_t(int, dtimper, |
| 518 | latency / beaconint_us); |
| 519 | |
| 520 | local->hw.conf.max_sleep_period = maxslp; |
| 521 | local->hw.conf.ps_dtim_period = dtimper; |
| 522 | local->ps_sdata = found; |
| 523 | } |
| 524 | } else { |
| 525 | local->ps_sdata = NULL; |
| 526 | } |
| 527 | |
| 528 | change: |
| 529 | ieee80211_change_ps(local); |
| 530 | } |
| 531 | |
| 532 | void ieee80211_dynamic_ps_disable_work(struct work_struct *work) |
| 533 | { |
| 534 | struct ieee80211_local *local = |
| 535 | container_of(work, struct ieee80211_local, |
| 536 | dynamic_ps_disable_work); |
| 537 | |
| 538 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
| 539 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; |
| 540 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); |
| 541 | } |
| 542 | |
| 543 | ieee80211_wake_queues_by_reason(&local->hw, |
| 544 | IEEE80211_QUEUE_STOP_REASON_PS); |
| 545 | } |
| 546 | |
| 547 | void ieee80211_dynamic_ps_enable_work(struct work_struct *work) |
| 548 | { |
| 549 | struct ieee80211_local *local = |
| 550 | container_of(work, struct ieee80211_local, |
| 551 | dynamic_ps_enable_work); |
| 552 | struct ieee80211_sub_if_data *sdata = local->ps_sdata; |
| 553 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 554 | |
| 555 | /* can only happen when PS was just disabled anyway */ |
| 556 | if (!sdata) |
| 557 | return; |
| 558 | |
| 559 | if (local->hw.conf.flags & IEEE80211_CONF_PS) |
| 560 | return; |
| 561 | |
| 562 | if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && |
| 563 | (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) |
| 564 | ieee80211_send_nullfunc(local, sdata, 1); |
| 565 | |
| 566 | if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && |
| 567 | (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || |
| 568 | (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { |
| 569 | ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; |
| 570 | local->hw.conf.flags |= IEEE80211_CONF_PS; |
| 571 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | void ieee80211_dynamic_ps_timer(unsigned long data) |
| 576 | { |
| 577 | struct ieee80211_local *local = (void *) data; |
| 578 | |
| 579 | if (local->quiescing || local->suspended) |
| 580 | return; |
| 581 | |
| 582 | ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); |
| 583 | } |
| 584 | |
| 585 | /* MLME */ |
| 586 | static void ieee80211_sta_wmm_params(struct ieee80211_local *local, |
| 587 | struct ieee80211_if_managed *ifmgd, |
| 588 | u8 *wmm_param, size_t wmm_param_len) |
| 589 | { |
| 590 | struct ieee80211_tx_queue_params params; |
| 591 | size_t left; |
| 592 | int count; |
| 593 | u8 *pos, uapsd_queues = 0; |
| 594 | |
| 595 | if (local->hw.queues < 4) |
| 596 | return; |
| 597 | |
| 598 | if (!wmm_param) |
| 599 | return; |
| 600 | |
| 601 | if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) |
| 602 | return; |
| 603 | |
| 604 | if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) |
| 605 | uapsd_queues = local->uapsd_queues; |
| 606 | |
| 607 | count = wmm_param[6] & 0x0f; |
| 608 | if (count == ifmgd->wmm_last_param_set) |
| 609 | return; |
| 610 | ifmgd->wmm_last_param_set = count; |
| 611 | |
| 612 | pos = wmm_param + 8; |
| 613 | left = wmm_param_len - 8; |
| 614 | |
| 615 | memset(¶ms, 0, sizeof(params)); |
| 616 | |
| 617 | local->wmm_acm = 0; |
| 618 | for (; left >= 4; left -= 4, pos += 4) { |
| 619 | int aci = (pos[0] >> 5) & 0x03; |
| 620 | int acm = (pos[0] >> 4) & 0x01; |
| 621 | bool uapsd = false; |
| 622 | int queue; |
| 623 | |
| 624 | switch (aci) { |
| 625 | case 1: /* AC_BK */ |
| 626 | queue = 3; |
| 627 | if (acm) |
| 628 | local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ |
| 629 | if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) |
| 630 | uapsd = true; |
| 631 | break; |
| 632 | case 2: /* AC_VI */ |
| 633 | queue = 1; |
| 634 | if (acm) |
| 635 | local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ |
| 636 | if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) |
| 637 | uapsd = true; |
| 638 | break; |
| 639 | case 3: /* AC_VO */ |
| 640 | queue = 0; |
| 641 | if (acm) |
| 642 | local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ |
| 643 | if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) |
| 644 | uapsd = true; |
| 645 | break; |
| 646 | case 0: /* AC_BE */ |
| 647 | default: |
| 648 | queue = 2; |
| 649 | if (acm) |
| 650 | local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ |
| 651 | if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) |
| 652 | uapsd = true; |
| 653 | break; |
| 654 | } |
| 655 | |
| 656 | params.aifs = pos[0] & 0x0f; |
| 657 | params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); |
| 658 | params.cw_min = ecw2cw(pos[1] & 0x0f); |
| 659 | params.txop = get_unaligned_le16(pos + 2); |
| 660 | params.uapsd = uapsd; |
| 661 | |
| 662 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 663 | printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d " |
| 664 | "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", |
| 665 | wiphy_name(local->hw.wiphy), queue, aci, acm, |
| 666 | params.aifs, params.cw_min, params.cw_max, params.txop, |
| 667 | params.uapsd); |
| 668 | #endif |
| 669 | if (drv_conf_tx(local, queue, ¶ms) && local->ops->conf_tx) |
| 670 | printk(KERN_DEBUG "%s: failed to set TX queue " |
| 671 | "parameters for queue %d\n", |
| 672 | wiphy_name(local->hw.wiphy), queue); |
| 673 | } |
| 674 | } |
| 675 | |
| 676 | static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, |
| 677 | u16 capab, bool erp_valid, u8 erp) |
| 678 | { |
| 679 | struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; |
| 680 | u32 changed = 0; |
| 681 | bool use_protection; |
| 682 | bool use_short_preamble; |
| 683 | bool use_short_slot; |
| 684 | |
| 685 | if (erp_valid) { |
| 686 | use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; |
| 687 | use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; |
| 688 | } else { |
| 689 | use_protection = false; |
| 690 | use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); |
| 691 | } |
| 692 | |
| 693 | use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); |
| 694 | if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) |
| 695 | use_short_slot = true; |
| 696 | |
| 697 | if (use_protection != bss_conf->use_cts_prot) { |
| 698 | bss_conf->use_cts_prot = use_protection; |
| 699 | changed |= BSS_CHANGED_ERP_CTS_PROT; |
| 700 | } |
| 701 | |
| 702 | if (use_short_preamble != bss_conf->use_short_preamble) { |
| 703 | bss_conf->use_short_preamble = use_short_preamble; |
| 704 | changed |= BSS_CHANGED_ERP_PREAMBLE; |
| 705 | } |
| 706 | |
| 707 | if (use_short_slot != bss_conf->use_short_slot) { |
| 708 | bss_conf->use_short_slot = use_short_slot; |
| 709 | changed |= BSS_CHANGED_ERP_SLOT; |
| 710 | } |
| 711 | |
| 712 | return changed; |
| 713 | } |
| 714 | |
| 715 | static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, |
| 716 | struct cfg80211_bss *cbss, |
| 717 | u32 bss_info_changed) |
| 718 | { |
| 719 | struct ieee80211_bss *bss = (void *)cbss->priv; |
| 720 | struct ieee80211_local *local = sdata->local; |
| 721 | |
| 722 | bss_info_changed |= BSS_CHANGED_ASSOC; |
| 723 | /* set timing information */ |
| 724 | sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; |
| 725 | sdata->vif.bss_conf.timestamp = cbss->tsf; |
| 726 | |
| 727 | bss_info_changed |= BSS_CHANGED_BEACON_INT; |
| 728 | bss_info_changed |= ieee80211_handle_bss_capability(sdata, |
| 729 | cbss->capability, bss->has_erp_value, bss->erp_value); |
| 730 | |
| 731 | sdata->u.mgd.associated = cbss; |
| 732 | memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); |
| 733 | |
| 734 | /* just to be sure */ |
| 735 | sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | |
| 736 | IEEE80211_STA_BEACON_POLL); |
| 737 | |
| 738 | /* |
| 739 | * Always handle WMM once after association regardless |
| 740 | * of the first value the AP uses. Setting -1 here has |
| 741 | * that effect because the AP values is an unsigned |
| 742 | * 4-bit value. |
| 743 | */ |
| 744 | sdata->u.mgd.wmm_last_param_set = -1; |
| 745 | |
| 746 | ieee80211_led_assoc(local, 1); |
| 747 | |
| 748 | sdata->vif.bss_conf.assoc = 1; |
| 749 | /* |
| 750 | * For now just always ask the driver to update the basic rateset |
| 751 | * when we have associated, we aren't checking whether it actually |
| 752 | * changed or not. |
| 753 | */ |
| 754 | bss_info_changed |= BSS_CHANGED_BASIC_RATES; |
| 755 | |
| 756 | /* And the BSSID changed - we're associated now */ |
| 757 | bss_info_changed |= BSS_CHANGED_BSSID; |
| 758 | |
| 759 | ieee80211_bss_info_change_notify(sdata, bss_info_changed); |
| 760 | |
| 761 | mutex_lock(&local->iflist_mtx); |
| 762 | ieee80211_recalc_ps(local, -1); |
| 763 | ieee80211_recalc_smps(local, sdata); |
| 764 | mutex_unlock(&local->iflist_mtx); |
| 765 | |
| 766 | netif_tx_start_all_queues(sdata->dev); |
| 767 | netif_carrier_on(sdata->dev); |
| 768 | } |
| 769 | |
| 770 | static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata) |
| 771 | { |
| 772 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 773 | struct ieee80211_local *local = sdata->local; |
| 774 | struct sta_info *sta; |
| 775 | u32 changed = 0, config_changed = 0; |
| 776 | u8 bssid[ETH_ALEN]; |
| 777 | |
| 778 | ASSERT_MGD_MTX(ifmgd); |
| 779 | |
| 780 | if (WARN_ON(!ifmgd->associated)) |
| 781 | return; |
| 782 | |
| 783 | memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); |
| 784 | |
| 785 | ifmgd->associated = NULL; |
| 786 | memset(ifmgd->bssid, 0, ETH_ALEN); |
| 787 | |
| 788 | /* |
| 789 | * we need to commit the associated = NULL change because the |
| 790 | * scan code uses that to determine whether this iface should |
| 791 | * go to/wake up from powersave or not -- and could otherwise |
| 792 | * wake the queues erroneously. |
| 793 | */ |
| 794 | smp_mb(); |
| 795 | |
| 796 | /* |
| 797 | * Thus, we can only afterwards stop the queues -- to account |
| 798 | * for the case where another CPU is finishing a scan at this |
| 799 | * time -- we don't want the scan code to enable queues. |
| 800 | */ |
| 801 | |
| 802 | netif_tx_stop_all_queues(sdata->dev); |
| 803 | netif_carrier_off(sdata->dev); |
| 804 | |
| 805 | rcu_read_lock(); |
| 806 | sta = sta_info_get(sdata, bssid); |
| 807 | if (sta) { |
| 808 | set_sta_flags(sta, WLAN_STA_DISASSOC); |
| 809 | ieee80211_sta_tear_down_BA_sessions(sta); |
| 810 | } |
| 811 | rcu_read_unlock(); |
| 812 | |
| 813 | changed |= ieee80211_reset_erp_info(sdata); |
| 814 | |
| 815 | ieee80211_led_assoc(local, 0); |
| 816 | changed |= BSS_CHANGED_ASSOC; |
| 817 | sdata->vif.bss_conf.assoc = false; |
| 818 | |
| 819 | ieee80211_set_wmm_default(sdata); |
| 820 | |
| 821 | /* channel(_type) changes are handled by ieee80211_hw_config */ |
| 822 | local->oper_channel_type = NL80211_CHAN_NO_HT; |
| 823 | |
| 824 | /* on the next assoc, re-program HT parameters */ |
| 825 | sdata->ht_opmode_valid = false; |
| 826 | |
| 827 | local->power_constr_level = 0; |
| 828 | |
| 829 | del_timer_sync(&local->dynamic_ps_timer); |
| 830 | cancel_work_sync(&local->dynamic_ps_enable_work); |
| 831 | |
| 832 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
| 833 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; |
| 834 | config_changed |= IEEE80211_CONF_CHANGE_PS; |
| 835 | } |
| 836 | |
| 837 | ieee80211_hw_config(local, config_changed); |
| 838 | |
| 839 | /* And the BSSID changed -- not very interesting here */ |
| 840 | changed |= BSS_CHANGED_BSSID; |
| 841 | ieee80211_bss_info_change_notify(sdata, changed); |
| 842 | |
| 843 | sta_info_destroy_addr(sdata, bssid); |
| 844 | } |
| 845 | |
| 846 | void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, |
| 847 | struct ieee80211_hdr *hdr) |
| 848 | { |
| 849 | /* |
| 850 | * We can postpone the mgd.timer whenever receiving unicast frames |
| 851 | * from AP because we know that the connection is working both ways |
| 852 | * at that time. But multicast frames (and hence also beacons) must |
| 853 | * be ignored here, because we need to trigger the timer during |
| 854 | * data idle periods for sending the periodic probe request to the |
| 855 | * AP we're connected to. |
| 856 | */ |
| 857 | if (is_multicast_ether_addr(hdr->addr1)) |
| 858 | return; |
| 859 | |
| 860 | mod_timer(&sdata->u.mgd.conn_mon_timer, |
| 861 | round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); |
| 862 | } |
| 863 | |
| 864 | static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) |
| 865 | { |
| 866 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 867 | const u8 *ssid; |
| 868 | |
| 869 | ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); |
| 870 | ieee80211_send_probe_req(sdata, ifmgd->associated->bssid, |
| 871 | ssid + 2, ssid[1], NULL, 0); |
| 872 | |
| 873 | ifmgd->probe_send_count++; |
| 874 | ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT; |
| 875 | run_again(ifmgd, ifmgd->probe_timeout); |
| 876 | } |
| 877 | |
| 878 | static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, |
| 879 | bool beacon) |
| 880 | { |
| 881 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 882 | bool already = false; |
| 883 | |
| 884 | if (!ieee80211_sdata_running(sdata)) |
| 885 | return; |
| 886 | |
| 887 | if (sdata->local->scanning) |
| 888 | return; |
| 889 | |
| 890 | if (sdata->local->tmp_channel) |
| 891 | return; |
| 892 | |
| 893 | mutex_lock(&ifmgd->mtx); |
| 894 | |
| 895 | if (!ifmgd->associated) |
| 896 | goto out; |
| 897 | |
| 898 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 899 | if (beacon && net_ratelimit()) |
| 900 | printk(KERN_DEBUG "%s: detected beacon loss from AP " |
| 901 | "- sending probe request\n", sdata->name); |
| 902 | #endif |
| 903 | |
| 904 | /* |
| 905 | * The driver/our work has already reported this event or the |
| 906 | * connection monitoring has kicked in and we have already sent |
| 907 | * a probe request. Or maybe the AP died and the driver keeps |
| 908 | * reporting until we disassociate... |
| 909 | * |
| 910 | * In either case we have to ignore the current call to this |
| 911 | * function (except for setting the correct probe reason bit) |
| 912 | * because otherwise we would reset the timer every time and |
| 913 | * never check whether we received a probe response! |
| 914 | */ |
| 915 | if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | |
| 916 | IEEE80211_STA_CONNECTION_POLL)) |
| 917 | already = true; |
| 918 | |
| 919 | if (beacon) |
| 920 | ifmgd->flags |= IEEE80211_STA_BEACON_POLL; |
| 921 | else |
| 922 | ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; |
| 923 | |
| 924 | if (already) |
| 925 | goto out; |
| 926 | |
| 927 | mutex_lock(&sdata->local->iflist_mtx); |
| 928 | ieee80211_recalc_ps(sdata->local, -1); |
| 929 | mutex_unlock(&sdata->local->iflist_mtx); |
| 930 | |
| 931 | ifmgd->probe_send_count = 0; |
| 932 | ieee80211_mgd_probe_ap_send(sdata); |
| 933 | out: |
| 934 | mutex_unlock(&ifmgd->mtx); |
| 935 | } |
| 936 | |
| 937 | void ieee80211_beacon_loss_work(struct work_struct *work) |
| 938 | { |
| 939 | struct ieee80211_sub_if_data *sdata = |
| 940 | container_of(work, struct ieee80211_sub_if_data, |
| 941 | u.mgd.beacon_loss_work); |
| 942 | |
| 943 | ieee80211_mgd_probe_ap(sdata, true); |
| 944 | } |
| 945 | |
| 946 | void ieee80211_beacon_loss(struct ieee80211_vif *vif) |
| 947 | { |
| 948 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 949 | |
| 950 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work); |
| 951 | } |
| 952 | EXPORT_SYMBOL(ieee80211_beacon_loss); |
| 953 | |
| 954 | static enum rx_mgmt_action __must_check |
| 955 | ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, |
| 956 | struct ieee80211_mgmt *mgmt, size_t len) |
| 957 | { |
| 958 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 959 | const u8 *bssid = NULL; |
| 960 | u16 reason_code; |
| 961 | |
| 962 | if (len < 24 + 2) |
| 963 | return RX_MGMT_NONE; |
| 964 | |
| 965 | ASSERT_MGD_MTX(ifmgd); |
| 966 | |
| 967 | bssid = ifmgd->associated->bssid; |
| 968 | |
| 969 | reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); |
| 970 | |
| 971 | printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", |
| 972 | sdata->name, bssid, reason_code); |
| 973 | |
| 974 | ieee80211_set_disassoc(sdata); |
| 975 | ieee80211_recalc_idle(sdata->local); |
| 976 | |
| 977 | return RX_MGMT_CFG80211_DEAUTH; |
| 978 | } |
| 979 | |
| 980 | |
| 981 | static enum rx_mgmt_action __must_check |
| 982 | ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, |
| 983 | struct ieee80211_mgmt *mgmt, size_t len) |
| 984 | { |
| 985 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 986 | u16 reason_code; |
| 987 | |
| 988 | if (len < 24 + 2) |
| 989 | return RX_MGMT_NONE; |
| 990 | |
| 991 | ASSERT_MGD_MTX(ifmgd); |
| 992 | |
| 993 | if (WARN_ON(!ifmgd->associated)) |
| 994 | return RX_MGMT_NONE; |
| 995 | |
| 996 | if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) |
| 997 | return RX_MGMT_NONE; |
| 998 | |
| 999 | reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); |
| 1000 | |
| 1001 | printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", |
| 1002 | sdata->name, mgmt->sa, reason_code); |
| 1003 | |
| 1004 | ieee80211_set_disassoc(sdata); |
| 1005 | ieee80211_recalc_idle(sdata->local); |
| 1006 | return RX_MGMT_CFG80211_DISASSOC; |
| 1007 | } |
| 1008 | |
| 1009 | |
| 1010 | static bool ieee80211_assoc_success(struct ieee80211_work *wk, |
| 1011 | struct ieee80211_mgmt *mgmt, size_t len) |
| 1012 | { |
| 1013 | struct ieee80211_sub_if_data *sdata = wk->sdata; |
| 1014 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1015 | struct ieee80211_local *local = sdata->local; |
| 1016 | struct ieee80211_supported_band *sband; |
| 1017 | struct sta_info *sta; |
| 1018 | struct cfg80211_bss *cbss = wk->assoc.bss; |
| 1019 | u8 *pos; |
| 1020 | u32 rates, basic_rates; |
| 1021 | u16 capab_info, aid; |
| 1022 | struct ieee802_11_elems elems; |
| 1023 | struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; |
| 1024 | u32 changed = 0; |
| 1025 | int i, j, err; |
| 1026 | bool have_higher_than_11mbit = false; |
| 1027 | u16 ap_ht_cap_flags; |
| 1028 | |
| 1029 | /* AssocResp and ReassocResp have identical structure */ |
| 1030 | |
| 1031 | aid = le16_to_cpu(mgmt->u.assoc_resp.aid); |
| 1032 | capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); |
| 1033 | |
| 1034 | if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) |
| 1035 | printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " |
| 1036 | "set\n", sdata->name, aid); |
| 1037 | aid &= ~(BIT(15) | BIT(14)); |
| 1038 | |
| 1039 | pos = mgmt->u.assoc_resp.variable; |
| 1040 | ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); |
| 1041 | |
| 1042 | if (!elems.supp_rates) { |
| 1043 | printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", |
| 1044 | sdata->name); |
| 1045 | return false; |
| 1046 | } |
| 1047 | |
| 1048 | ifmgd->aid = aid; |
| 1049 | |
| 1050 | sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); |
| 1051 | if (!sta) { |
| 1052 | printk(KERN_DEBUG "%s: failed to alloc STA entry for" |
| 1053 | " the AP\n", sdata->name); |
| 1054 | return false; |
| 1055 | } |
| 1056 | |
| 1057 | set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | |
| 1058 | WLAN_STA_ASSOC_AP); |
| 1059 | if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) |
| 1060 | set_sta_flags(sta, WLAN_STA_AUTHORIZED); |
| 1061 | |
| 1062 | rates = 0; |
| 1063 | basic_rates = 0; |
| 1064 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
| 1065 | |
| 1066 | for (i = 0; i < elems.supp_rates_len; i++) { |
| 1067 | int rate = (elems.supp_rates[i] & 0x7f) * 5; |
| 1068 | bool is_basic = !!(elems.supp_rates[i] & 0x80); |
| 1069 | |
| 1070 | if (rate > 110) |
| 1071 | have_higher_than_11mbit = true; |
| 1072 | |
| 1073 | for (j = 0; j < sband->n_bitrates; j++) { |
| 1074 | if (sband->bitrates[j].bitrate == rate) { |
| 1075 | rates |= BIT(j); |
| 1076 | if (is_basic) |
| 1077 | basic_rates |= BIT(j); |
| 1078 | break; |
| 1079 | } |
| 1080 | } |
| 1081 | } |
| 1082 | |
| 1083 | for (i = 0; i < elems.ext_supp_rates_len; i++) { |
| 1084 | int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; |
| 1085 | bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); |
| 1086 | |
| 1087 | if (rate > 110) |
| 1088 | have_higher_than_11mbit = true; |
| 1089 | |
| 1090 | for (j = 0; j < sband->n_bitrates; j++) { |
| 1091 | if (sband->bitrates[j].bitrate == rate) { |
| 1092 | rates |= BIT(j); |
| 1093 | if (is_basic) |
| 1094 | basic_rates |= BIT(j); |
| 1095 | break; |
| 1096 | } |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | sta->sta.supp_rates[local->hw.conf.channel->band] = rates; |
| 1101 | sdata->vif.bss_conf.basic_rates = basic_rates; |
| 1102 | |
| 1103 | /* cf. IEEE 802.11 9.2.12 */ |
| 1104 | if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && |
| 1105 | have_higher_than_11mbit) |
| 1106 | sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; |
| 1107 | else |
| 1108 | sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; |
| 1109 | |
| 1110 | if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) |
| 1111 | ieee80211_ht_cap_ie_to_sta_ht_cap(sband, |
| 1112 | elems.ht_cap_elem, &sta->sta.ht_cap); |
| 1113 | |
| 1114 | ap_ht_cap_flags = sta->sta.ht_cap.cap; |
| 1115 | |
| 1116 | rate_control_rate_init(sta); |
| 1117 | |
| 1118 | if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) |
| 1119 | set_sta_flags(sta, WLAN_STA_MFP); |
| 1120 | |
| 1121 | if (elems.wmm_param) |
| 1122 | set_sta_flags(sta, WLAN_STA_WME); |
| 1123 | |
| 1124 | err = sta_info_insert(sta); |
| 1125 | sta = NULL; |
| 1126 | if (err) { |
| 1127 | printk(KERN_DEBUG "%s: failed to insert STA entry for" |
| 1128 | " the AP (error %d)\n", sdata->name, err); |
| 1129 | return false; |
| 1130 | } |
| 1131 | |
| 1132 | if (elems.wmm_param) |
| 1133 | ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param, |
| 1134 | elems.wmm_param_len); |
| 1135 | else |
| 1136 | ieee80211_set_wmm_default(sdata); |
| 1137 | |
| 1138 | local->oper_channel = wk->chan; |
| 1139 | |
| 1140 | if (elems.ht_info_elem && elems.wmm_param && |
| 1141 | (sdata->local->hw.queues >= 4) && |
| 1142 | !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) |
| 1143 | changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, |
| 1144 | cbss->bssid, ap_ht_cap_flags); |
| 1145 | |
| 1146 | /* set AID and assoc capability, |
| 1147 | * ieee80211_set_associated() will tell the driver */ |
| 1148 | bss_conf->aid = aid; |
| 1149 | bss_conf->assoc_capability = capab_info; |
| 1150 | ieee80211_set_associated(sdata, cbss, changed); |
| 1151 | |
| 1152 | /* |
| 1153 | * If we're using 4-addr mode, let the AP know that we're |
| 1154 | * doing so, so that it can create the STA VLAN on its side |
| 1155 | */ |
| 1156 | if (ifmgd->use_4addr) |
| 1157 | ieee80211_send_4addr_nullfunc(local, sdata); |
| 1158 | |
| 1159 | /* |
| 1160 | * Start timer to probe the connection to the AP now. |
| 1161 | * Also start the timer that will detect beacon loss. |
| 1162 | */ |
| 1163 | ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); |
| 1164 | mod_beacon_timer(sdata); |
| 1165 | |
| 1166 | return true; |
| 1167 | } |
| 1168 | |
| 1169 | |
| 1170 | static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, |
| 1171 | struct ieee80211_mgmt *mgmt, |
| 1172 | size_t len, |
| 1173 | struct ieee80211_rx_status *rx_status, |
| 1174 | struct ieee802_11_elems *elems, |
| 1175 | bool beacon) |
| 1176 | { |
| 1177 | struct ieee80211_local *local = sdata->local; |
| 1178 | int freq; |
| 1179 | struct ieee80211_bss *bss; |
| 1180 | struct ieee80211_channel *channel; |
| 1181 | bool need_ps = false; |
| 1182 | |
| 1183 | if (sdata->u.mgd.associated) { |
| 1184 | bss = (void *)sdata->u.mgd.associated->priv; |
| 1185 | /* not previously set so we may need to recalc */ |
| 1186 | need_ps = !bss->dtim_period; |
| 1187 | } |
| 1188 | |
| 1189 | if (elems->ds_params && elems->ds_params_len == 1) |
| 1190 | freq = ieee80211_channel_to_frequency(elems->ds_params[0]); |
| 1191 | else |
| 1192 | freq = rx_status->freq; |
| 1193 | |
| 1194 | channel = ieee80211_get_channel(local->hw.wiphy, freq); |
| 1195 | |
| 1196 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
| 1197 | return; |
| 1198 | |
| 1199 | bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, |
| 1200 | channel, beacon); |
| 1201 | if (bss) |
| 1202 | ieee80211_rx_bss_put(local, bss); |
| 1203 | |
| 1204 | if (!sdata->u.mgd.associated) |
| 1205 | return; |
| 1206 | |
| 1207 | if (need_ps) { |
| 1208 | mutex_lock(&local->iflist_mtx); |
| 1209 | ieee80211_recalc_ps(local, -1); |
| 1210 | mutex_unlock(&local->iflist_mtx); |
| 1211 | } |
| 1212 | |
| 1213 | if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && |
| 1214 | (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, |
| 1215 | ETH_ALEN) == 0)) { |
| 1216 | struct ieee80211_channel_sw_ie *sw_elem = |
| 1217 | (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; |
| 1218 | ieee80211_sta_process_chanswitch(sdata, sw_elem, bss); |
| 1219 | } |
| 1220 | } |
| 1221 | |
| 1222 | |
| 1223 | static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, |
| 1224 | struct sk_buff *skb) |
| 1225 | { |
| 1226 | struct ieee80211_mgmt *mgmt = (void *)skb->data; |
| 1227 | struct ieee80211_if_managed *ifmgd; |
| 1228 | struct ieee80211_rx_status *rx_status = (void *) skb->cb; |
| 1229 | size_t baselen, len = skb->len; |
| 1230 | struct ieee802_11_elems elems; |
| 1231 | |
| 1232 | ifmgd = &sdata->u.mgd; |
| 1233 | |
| 1234 | ASSERT_MGD_MTX(ifmgd); |
| 1235 | |
| 1236 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
| 1237 | return; /* ignore ProbeResp to foreign address */ |
| 1238 | |
| 1239 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; |
| 1240 | if (baselen > len) |
| 1241 | return; |
| 1242 | |
| 1243 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, |
| 1244 | &elems); |
| 1245 | |
| 1246 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); |
| 1247 | |
| 1248 | if (ifmgd->associated && |
| 1249 | memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 && |
| 1250 | ifmgd->flags & (IEEE80211_STA_BEACON_POLL | |
| 1251 | IEEE80211_STA_CONNECTION_POLL)) { |
| 1252 | ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | |
| 1253 | IEEE80211_STA_BEACON_POLL); |
| 1254 | mutex_lock(&sdata->local->iflist_mtx); |
| 1255 | ieee80211_recalc_ps(sdata->local, -1); |
| 1256 | mutex_unlock(&sdata->local->iflist_mtx); |
| 1257 | /* |
| 1258 | * We've received a probe response, but are not sure whether |
| 1259 | * we have or will be receiving any beacons or data, so let's |
| 1260 | * schedule the timers again, just in case. |
| 1261 | */ |
| 1262 | mod_beacon_timer(sdata); |
| 1263 | mod_timer(&ifmgd->conn_mon_timer, |
| 1264 | round_jiffies_up(jiffies + |
| 1265 | IEEE80211_CONNECTION_IDLE_TIME)); |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | /* |
| 1270 | * This is the canonical list of information elements we care about, |
| 1271 | * the filter code also gives us all changes to the Microsoft OUI |
| 1272 | * (00:50:F2) vendor IE which is used for WMM which we need to track. |
| 1273 | * |
| 1274 | * We implement beacon filtering in software since that means we can |
| 1275 | * avoid processing the frame here and in cfg80211, and userspace |
| 1276 | * will not be able to tell whether the hardware supports it or not. |
| 1277 | * |
| 1278 | * XXX: This list needs to be dynamic -- userspace needs to be able to |
| 1279 | * add items it requires. It also needs to be able to tell us to |
| 1280 | * look out for other vendor IEs. |
| 1281 | */ |
| 1282 | static const u64 care_about_ies = |
| 1283 | (1ULL << WLAN_EID_COUNTRY) | |
| 1284 | (1ULL << WLAN_EID_ERP_INFO) | |
| 1285 | (1ULL << WLAN_EID_CHANNEL_SWITCH) | |
| 1286 | (1ULL << WLAN_EID_PWR_CONSTRAINT) | |
| 1287 | (1ULL << WLAN_EID_HT_CAPABILITY) | |
| 1288 | (1ULL << WLAN_EID_HT_INFORMATION); |
| 1289 | |
| 1290 | static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, |
| 1291 | struct ieee80211_mgmt *mgmt, |
| 1292 | size_t len, |
| 1293 | struct ieee80211_rx_status *rx_status) |
| 1294 | { |
| 1295 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1296 | size_t baselen; |
| 1297 | struct ieee802_11_elems elems; |
| 1298 | struct ieee80211_local *local = sdata->local; |
| 1299 | u32 changed = 0; |
| 1300 | bool erp_valid, directed_tim = false; |
| 1301 | u8 erp_value = 0; |
| 1302 | u32 ncrc; |
| 1303 | u8 *bssid; |
| 1304 | |
| 1305 | ASSERT_MGD_MTX(ifmgd); |
| 1306 | |
| 1307 | /* Process beacon from the current BSS */ |
| 1308 | baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; |
| 1309 | if (baselen > len) |
| 1310 | return; |
| 1311 | |
| 1312 | if (rx_status->freq != local->hw.conf.channel->center_freq) |
| 1313 | return; |
| 1314 | |
| 1315 | /* |
| 1316 | * We might have received a number of frames, among them a |
| 1317 | * disassoc frame and a beacon... |
| 1318 | */ |
| 1319 | if (!ifmgd->associated) |
| 1320 | return; |
| 1321 | |
| 1322 | bssid = ifmgd->associated->bssid; |
| 1323 | |
| 1324 | /* |
| 1325 | * And in theory even frames from a different AP we were just |
| 1326 | * associated to a split-second ago! |
| 1327 | */ |
| 1328 | if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) |
| 1329 | return; |
| 1330 | |
| 1331 | if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { |
| 1332 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 1333 | if (net_ratelimit()) { |
| 1334 | printk(KERN_DEBUG "%s: cancelling probereq poll due " |
| 1335 | "to a received beacon\n", sdata->name); |
| 1336 | } |
| 1337 | #endif |
| 1338 | ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; |
| 1339 | mutex_lock(&local->iflist_mtx); |
| 1340 | ieee80211_recalc_ps(local, -1); |
| 1341 | mutex_unlock(&local->iflist_mtx); |
| 1342 | } |
| 1343 | |
| 1344 | /* |
| 1345 | * Push the beacon loss detection into the future since |
| 1346 | * we are processing a beacon from the AP just now. |
| 1347 | */ |
| 1348 | mod_beacon_timer(sdata); |
| 1349 | |
| 1350 | ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); |
| 1351 | ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, |
| 1352 | len - baselen, &elems, |
| 1353 | care_about_ies, ncrc); |
| 1354 | |
| 1355 | if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) |
| 1356 | directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, |
| 1357 | ifmgd->aid); |
| 1358 | |
| 1359 | if (ncrc != ifmgd->beacon_crc) { |
| 1360 | ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, |
| 1361 | true); |
| 1362 | |
| 1363 | ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param, |
| 1364 | elems.wmm_param_len); |
| 1365 | } |
| 1366 | |
| 1367 | if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { |
| 1368 | if (directed_tim) { |
| 1369 | if (local->hw.conf.dynamic_ps_timeout > 0) { |
| 1370 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; |
| 1371 | ieee80211_hw_config(local, |
| 1372 | IEEE80211_CONF_CHANGE_PS); |
| 1373 | ieee80211_send_nullfunc(local, sdata, 0); |
| 1374 | } else { |
| 1375 | local->pspolling = true; |
| 1376 | |
| 1377 | /* |
| 1378 | * Here is assumed that the driver will be |
| 1379 | * able to send ps-poll frame and receive a |
| 1380 | * response even though power save mode is |
| 1381 | * enabled, but some drivers might require |
| 1382 | * to disable power save here. This needs |
| 1383 | * to be investigated. |
| 1384 | */ |
| 1385 | ieee80211_send_pspoll(local, sdata); |
| 1386 | } |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | if (ncrc == ifmgd->beacon_crc) |
| 1391 | return; |
| 1392 | ifmgd->beacon_crc = ncrc; |
| 1393 | |
| 1394 | if (elems.erp_info && elems.erp_info_len >= 1) { |
| 1395 | erp_valid = true; |
| 1396 | erp_value = elems.erp_info[0]; |
| 1397 | } else { |
| 1398 | erp_valid = false; |
| 1399 | } |
| 1400 | changed |= ieee80211_handle_bss_capability(sdata, |
| 1401 | le16_to_cpu(mgmt->u.beacon.capab_info), |
| 1402 | erp_valid, erp_value); |
| 1403 | |
| 1404 | |
| 1405 | if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && |
| 1406 | !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { |
| 1407 | struct sta_info *sta; |
| 1408 | struct ieee80211_supported_band *sband; |
| 1409 | u16 ap_ht_cap_flags; |
| 1410 | |
| 1411 | rcu_read_lock(); |
| 1412 | |
| 1413 | sta = sta_info_get(sdata, bssid); |
| 1414 | if (WARN_ON(!sta)) { |
| 1415 | rcu_read_unlock(); |
| 1416 | return; |
| 1417 | } |
| 1418 | |
| 1419 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
| 1420 | |
| 1421 | ieee80211_ht_cap_ie_to_sta_ht_cap(sband, |
| 1422 | elems.ht_cap_elem, &sta->sta.ht_cap); |
| 1423 | |
| 1424 | ap_ht_cap_flags = sta->sta.ht_cap.cap; |
| 1425 | |
| 1426 | rcu_read_unlock(); |
| 1427 | |
| 1428 | changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, |
| 1429 | bssid, ap_ht_cap_flags); |
| 1430 | } |
| 1431 | |
| 1432 | /* Note: country IE parsing is done for us by cfg80211 */ |
| 1433 | if (elems.country_elem) { |
| 1434 | /* TODO: IBSS also needs this */ |
| 1435 | if (elems.pwr_constr_elem) |
| 1436 | ieee80211_handle_pwr_constr(sdata, |
| 1437 | le16_to_cpu(mgmt->u.probe_resp.capab_info), |
| 1438 | elems.pwr_constr_elem, |
| 1439 | elems.pwr_constr_elem_len); |
| 1440 | } |
| 1441 | |
| 1442 | ieee80211_bss_info_change_notify(sdata, changed); |
| 1443 | } |
| 1444 | |
| 1445 | ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, |
| 1446 | struct sk_buff *skb) |
| 1447 | { |
| 1448 | struct ieee80211_local *local = sdata->local; |
| 1449 | struct ieee80211_mgmt *mgmt; |
| 1450 | u16 fc; |
| 1451 | |
| 1452 | if (skb->len < 24) |
| 1453 | return RX_DROP_MONITOR; |
| 1454 | |
| 1455 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 1456 | fc = le16_to_cpu(mgmt->frame_control); |
| 1457 | |
| 1458 | switch (fc & IEEE80211_FCTL_STYPE) { |
| 1459 | case IEEE80211_STYPE_PROBE_RESP: |
| 1460 | case IEEE80211_STYPE_BEACON: |
| 1461 | case IEEE80211_STYPE_DEAUTH: |
| 1462 | case IEEE80211_STYPE_DISASSOC: |
| 1463 | case IEEE80211_STYPE_ACTION: |
| 1464 | skb_queue_tail(&sdata->u.mgd.skb_queue, skb); |
| 1465 | ieee80211_queue_work(&local->hw, &sdata->u.mgd.work); |
| 1466 | return RX_QUEUED; |
| 1467 | } |
| 1468 | |
| 1469 | return RX_DROP_MONITOR; |
| 1470 | } |
| 1471 | |
| 1472 | static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, |
| 1473 | struct sk_buff *skb) |
| 1474 | { |
| 1475 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1476 | struct ieee80211_rx_status *rx_status; |
| 1477 | struct ieee80211_mgmt *mgmt; |
| 1478 | enum rx_mgmt_action rma = RX_MGMT_NONE; |
| 1479 | u16 fc; |
| 1480 | |
| 1481 | rx_status = (struct ieee80211_rx_status *) skb->cb; |
| 1482 | mgmt = (struct ieee80211_mgmt *) skb->data; |
| 1483 | fc = le16_to_cpu(mgmt->frame_control); |
| 1484 | |
| 1485 | mutex_lock(&ifmgd->mtx); |
| 1486 | |
| 1487 | if (ifmgd->associated && |
| 1488 | memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { |
| 1489 | switch (fc & IEEE80211_FCTL_STYPE) { |
| 1490 | case IEEE80211_STYPE_BEACON: |
| 1491 | ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, |
| 1492 | rx_status); |
| 1493 | break; |
| 1494 | case IEEE80211_STYPE_PROBE_RESP: |
| 1495 | ieee80211_rx_mgmt_probe_resp(sdata, skb); |
| 1496 | break; |
| 1497 | case IEEE80211_STYPE_DEAUTH: |
| 1498 | rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); |
| 1499 | break; |
| 1500 | case IEEE80211_STYPE_DISASSOC: |
| 1501 | rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); |
| 1502 | break; |
| 1503 | case IEEE80211_STYPE_ACTION: |
| 1504 | if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) |
| 1505 | break; |
| 1506 | |
| 1507 | ieee80211_sta_process_chanswitch(sdata, |
| 1508 | &mgmt->u.action.u.chan_switch.sw_elem, |
| 1509 | (void *)ifmgd->associated->priv); |
| 1510 | break; |
| 1511 | } |
| 1512 | mutex_unlock(&ifmgd->mtx); |
| 1513 | |
| 1514 | switch (rma) { |
| 1515 | case RX_MGMT_NONE: |
| 1516 | /* no action */ |
| 1517 | break; |
| 1518 | case RX_MGMT_CFG80211_DEAUTH: |
| 1519 | cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); |
| 1520 | break; |
| 1521 | case RX_MGMT_CFG80211_DISASSOC: |
| 1522 | cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); |
| 1523 | break; |
| 1524 | default: |
| 1525 | WARN(1, "unexpected: %d", rma); |
| 1526 | } |
| 1527 | goto out; |
| 1528 | } |
| 1529 | |
| 1530 | mutex_unlock(&ifmgd->mtx); |
| 1531 | |
| 1532 | if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && |
| 1533 | (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) |
| 1534 | cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); |
| 1535 | |
| 1536 | out: |
| 1537 | kfree_skb(skb); |
| 1538 | } |
| 1539 | |
| 1540 | static void ieee80211_sta_timer(unsigned long data) |
| 1541 | { |
| 1542 | struct ieee80211_sub_if_data *sdata = |
| 1543 | (struct ieee80211_sub_if_data *) data; |
| 1544 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1545 | struct ieee80211_local *local = sdata->local; |
| 1546 | |
| 1547 | if (local->quiescing) { |
| 1548 | set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); |
| 1549 | return; |
| 1550 | } |
| 1551 | |
| 1552 | ieee80211_queue_work(&local->hw, &ifmgd->work); |
| 1553 | } |
| 1554 | |
| 1555 | static void ieee80211_sta_work(struct work_struct *work) |
| 1556 | { |
| 1557 | struct ieee80211_sub_if_data *sdata = |
| 1558 | container_of(work, struct ieee80211_sub_if_data, u.mgd.work); |
| 1559 | struct ieee80211_local *local = sdata->local; |
| 1560 | struct ieee80211_if_managed *ifmgd; |
| 1561 | struct sk_buff *skb; |
| 1562 | |
| 1563 | if (!ieee80211_sdata_running(sdata)) |
| 1564 | return; |
| 1565 | |
| 1566 | if (local->scanning) |
| 1567 | return; |
| 1568 | |
| 1569 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) |
| 1570 | return; |
| 1571 | |
| 1572 | /* |
| 1573 | * ieee80211_queue_work() should have picked up most cases, |
| 1574 | * here we'll pick the the rest. |
| 1575 | */ |
| 1576 | if (WARN(local->suspended, "STA MLME work scheduled while " |
| 1577 | "going to suspend\n")) |
| 1578 | return; |
| 1579 | |
| 1580 | ifmgd = &sdata->u.mgd; |
| 1581 | |
| 1582 | /* first process frames to avoid timing out while a frame is pending */ |
| 1583 | while ((skb = skb_dequeue(&ifmgd->skb_queue))) |
| 1584 | ieee80211_sta_rx_queued_mgmt(sdata, skb); |
| 1585 | |
| 1586 | /* then process the rest of the work */ |
| 1587 | mutex_lock(&ifmgd->mtx); |
| 1588 | |
| 1589 | if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | |
| 1590 | IEEE80211_STA_CONNECTION_POLL) && |
| 1591 | ifmgd->associated) { |
| 1592 | u8 bssid[ETH_ALEN]; |
| 1593 | |
| 1594 | memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); |
| 1595 | if (time_is_after_jiffies(ifmgd->probe_timeout)) |
| 1596 | run_again(ifmgd, ifmgd->probe_timeout); |
| 1597 | |
| 1598 | else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) { |
| 1599 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 1600 | printk(KERN_DEBUG "No probe response from AP %pM" |
| 1601 | " after %dms, try %d\n", bssid, |
| 1602 | (1000 * IEEE80211_PROBE_WAIT)/HZ, |
| 1603 | ifmgd->probe_send_count); |
| 1604 | #endif |
| 1605 | ieee80211_mgd_probe_ap_send(sdata); |
| 1606 | } else { |
| 1607 | /* |
| 1608 | * We actually lost the connection ... or did we? |
| 1609 | * Let's make sure! |
| 1610 | */ |
| 1611 | ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | |
| 1612 | IEEE80211_STA_BEACON_POLL); |
| 1613 | printk(KERN_DEBUG "No probe response from AP %pM" |
| 1614 | " after %dms, disconnecting.\n", |
| 1615 | bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ); |
| 1616 | ieee80211_set_disassoc(sdata); |
| 1617 | ieee80211_recalc_idle(local); |
| 1618 | mutex_unlock(&ifmgd->mtx); |
| 1619 | /* |
| 1620 | * must be outside lock due to cfg80211, |
| 1621 | * but that's not a problem. |
| 1622 | */ |
| 1623 | ieee80211_send_deauth_disassoc(sdata, bssid, |
| 1624 | IEEE80211_STYPE_DEAUTH, |
| 1625 | WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, |
| 1626 | NULL); |
| 1627 | mutex_lock(&ifmgd->mtx); |
| 1628 | } |
| 1629 | } |
| 1630 | |
| 1631 | mutex_unlock(&ifmgd->mtx); |
| 1632 | } |
| 1633 | |
| 1634 | static void ieee80211_sta_bcn_mon_timer(unsigned long data) |
| 1635 | { |
| 1636 | struct ieee80211_sub_if_data *sdata = |
| 1637 | (struct ieee80211_sub_if_data *) data; |
| 1638 | struct ieee80211_local *local = sdata->local; |
| 1639 | |
| 1640 | if (local->quiescing) |
| 1641 | return; |
| 1642 | |
| 1643 | ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work); |
| 1644 | } |
| 1645 | |
| 1646 | static void ieee80211_sta_conn_mon_timer(unsigned long data) |
| 1647 | { |
| 1648 | struct ieee80211_sub_if_data *sdata = |
| 1649 | (struct ieee80211_sub_if_data *) data; |
| 1650 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1651 | struct ieee80211_local *local = sdata->local; |
| 1652 | |
| 1653 | if (local->quiescing) |
| 1654 | return; |
| 1655 | |
| 1656 | ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); |
| 1657 | } |
| 1658 | |
| 1659 | static void ieee80211_sta_monitor_work(struct work_struct *work) |
| 1660 | { |
| 1661 | struct ieee80211_sub_if_data *sdata = |
| 1662 | container_of(work, struct ieee80211_sub_if_data, |
| 1663 | u.mgd.monitor_work); |
| 1664 | |
| 1665 | ieee80211_mgd_probe_ap(sdata, false); |
| 1666 | } |
| 1667 | |
| 1668 | static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) |
| 1669 | { |
| 1670 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
| 1671 | sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | |
| 1672 | IEEE80211_STA_CONNECTION_POLL); |
| 1673 | |
| 1674 | /* let's probe the connection once */ |
| 1675 | ieee80211_queue_work(&sdata->local->hw, |
| 1676 | &sdata->u.mgd.monitor_work); |
| 1677 | /* and do all the other regular work too */ |
| 1678 | ieee80211_queue_work(&sdata->local->hw, |
| 1679 | &sdata->u.mgd.work); |
| 1680 | } |
| 1681 | } |
| 1682 | |
| 1683 | #ifdef CONFIG_PM |
| 1684 | void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) |
| 1685 | { |
| 1686 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1687 | |
| 1688 | /* |
| 1689 | * we need to use atomic bitops for the running bits |
| 1690 | * only because both timers might fire at the same |
| 1691 | * time -- the code here is properly synchronised. |
| 1692 | */ |
| 1693 | |
| 1694 | cancel_work_sync(&ifmgd->work); |
| 1695 | cancel_work_sync(&ifmgd->beacon_loss_work); |
| 1696 | if (del_timer_sync(&ifmgd->timer)) |
| 1697 | set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); |
| 1698 | |
| 1699 | cancel_work_sync(&ifmgd->chswitch_work); |
| 1700 | if (del_timer_sync(&ifmgd->chswitch_timer)) |
| 1701 | set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); |
| 1702 | |
| 1703 | cancel_work_sync(&ifmgd->monitor_work); |
| 1704 | /* these will just be re-established on connection */ |
| 1705 | del_timer_sync(&ifmgd->conn_mon_timer); |
| 1706 | del_timer_sync(&ifmgd->bcn_mon_timer); |
| 1707 | } |
| 1708 | |
| 1709 | void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) |
| 1710 | { |
| 1711 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1712 | |
| 1713 | if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) |
| 1714 | add_timer(&ifmgd->timer); |
| 1715 | if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) |
| 1716 | add_timer(&ifmgd->chswitch_timer); |
| 1717 | } |
| 1718 | #endif |
| 1719 | |
| 1720 | /* interface setup */ |
| 1721 | void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) |
| 1722 | { |
| 1723 | struct ieee80211_if_managed *ifmgd; |
| 1724 | |
| 1725 | ifmgd = &sdata->u.mgd; |
| 1726 | INIT_WORK(&ifmgd->work, ieee80211_sta_work); |
| 1727 | INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); |
| 1728 | INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); |
| 1729 | INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work); |
| 1730 | setup_timer(&ifmgd->timer, ieee80211_sta_timer, |
| 1731 | (unsigned long) sdata); |
| 1732 | setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, |
| 1733 | (unsigned long) sdata); |
| 1734 | setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, |
| 1735 | (unsigned long) sdata); |
| 1736 | setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, |
| 1737 | (unsigned long) sdata); |
| 1738 | skb_queue_head_init(&ifmgd->skb_queue); |
| 1739 | |
| 1740 | ifmgd->flags = 0; |
| 1741 | |
| 1742 | mutex_init(&ifmgd->mtx); |
| 1743 | |
| 1744 | if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) |
| 1745 | ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; |
| 1746 | else |
| 1747 | ifmgd->req_smps = IEEE80211_SMPS_OFF; |
| 1748 | } |
| 1749 | |
| 1750 | /* scan finished notification */ |
| 1751 | void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) |
| 1752 | { |
| 1753 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; |
| 1754 | |
| 1755 | /* Restart STA timers */ |
| 1756 | rcu_read_lock(); |
| 1757 | list_for_each_entry_rcu(sdata, &local->interfaces, list) |
| 1758 | ieee80211_restart_sta_timer(sdata); |
| 1759 | rcu_read_unlock(); |
| 1760 | } |
| 1761 | |
| 1762 | int ieee80211_max_network_latency(struct notifier_block *nb, |
| 1763 | unsigned long data, void *dummy) |
| 1764 | { |
| 1765 | s32 latency_usec = (s32) data; |
| 1766 | struct ieee80211_local *local = |
| 1767 | container_of(nb, struct ieee80211_local, |
| 1768 | network_latency_notifier); |
| 1769 | |
| 1770 | mutex_lock(&local->iflist_mtx); |
| 1771 | ieee80211_recalc_ps(local, latency_usec); |
| 1772 | mutex_unlock(&local->iflist_mtx); |
| 1773 | |
| 1774 | return 0; |
| 1775 | } |
| 1776 | |
| 1777 | /* config hooks */ |
| 1778 | static enum work_done_result |
| 1779 | ieee80211_probe_auth_done(struct ieee80211_work *wk, |
| 1780 | struct sk_buff *skb) |
| 1781 | { |
| 1782 | if (!skb) { |
| 1783 | cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); |
| 1784 | return WORK_DONE_DESTROY; |
| 1785 | } |
| 1786 | |
| 1787 | if (wk->type == IEEE80211_WORK_AUTH) { |
| 1788 | cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); |
| 1789 | return WORK_DONE_DESTROY; |
| 1790 | } |
| 1791 | |
| 1792 | mutex_lock(&wk->sdata->u.mgd.mtx); |
| 1793 | ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); |
| 1794 | mutex_unlock(&wk->sdata->u.mgd.mtx); |
| 1795 | |
| 1796 | wk->type = IEEE80211_WORK_AUTH; |
| 1797 | wk->probe_auth.tries = 0; |
| 1798 | return WORK_DONE_REQUEUE; |
| 1799 | } |
| 1800 | |
| 1801 | int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, |
| 1802 | struct cfg80211_auth_request *req) |
| 1803 | { |
| 1804 | const u8 *ssid; |
| 1805 | struct ieee80211_work *wk; |
| 1806 | u16 auth_alg; |
| 1807 | |
| 1808 | switch (req->auth_type) { |
| 1809 | case NL80211_AUTHTYPE_OPEN_SYSTEM: |
| 1810 | auth_alg = WLAN_AUTH_OPEN; |
| 1811 | break; |
| 1812 | case NL80211_AUTHTYPE_SHARED_KEY: |
| 1813 | auth_alg = WLAN_AUTH_SHARED_KEY; |
| 1814 | break; |
| 1815 | case NL80211_AUTHTYPE_FT: |
| 1816 | auth_alg = WLAN_AUTH_FT; |
| 1817 | break; |
| 1818 | case NL80211_AUTHTYPE_NETWORK_EAP: |
| 1819 | auth_alg = WLAN_AUTH_LEAP; |
| 1820 | break; |
| 1821 | default: |
| 1822 | return -EOPNOTSUPP; |
| 1823 | } |
| 1824 | |
| 1825 | wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); |
| 1826 | if (!wk) |
| 1827 | return -ENOMEM; |
| 1828 | |
| 1829 | memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); |
| 1830 | |
| 1831 | if (req->ie && req->ie_len) { |
| 1832 | memcpy(wk->ie, req->ie, req->ie_len); |
| 1833 | wk->ie_len = req->ie_len; |
| 1834 | } |
| 1835 | |
| 1836 | if (req->key && req->key_len) { |
| 1837 | wk->probe_auth.key_len = req->key_len; |
| 1838 | wk->probe_auth.key_idx = req->key_idx; |
| 1839 | memcpy(wk->probe_auth.key, req->key, req->key_len); |
| 1840 | } |
| 1841 | |
| 1842 | ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); |
| 1843 | memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); |
| 1844 | wk->probe_auth.ssid_len = ssid[1]; |
| 1845 | |
| 1846 | wk->probe_auth.algorithm = auth_alg; |
| 1847 | wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; |
| 1848 | |
| 1849 | /* if we already have a probe, don't probe again */ |
| 1850 | if (req->bss->proberesp_ies) |
| 1851 | wk->type = IEEE80211_WORK_AUTH; |
| 1852 | else |
| 1853 | wk->type = IEEE80211_WORK_DIRECT_PROBE; |
| 1854 | wk->chan = req->bss->channel; |
| 1855 | wk->sdata = sdata; |
| 1856 | wk->done = ieee80211_probe_auth_done; |
| 1857 | |
| 1858 | ieee80211_add_work(wk); |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
| 1862 | static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, |
| 1863 | struct sk_buff *skb) |
| 1864 | { |
| 1865 | struct ieee80211_mgmt *mgmt; |
| 1866 | u16 status; |
| 1867 | |
| 1868 | if (!skb) { |
| 1869 | cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); |
| 1870 | return WORK_DONE_DESTROY; |
| 1871 | } |
| 1872 | |
| 1873 | mgmt = (void *)skb->data; |
| 1874 | status = le16_to_cpu(mgmt->u.assoc_resp.status_code); |
| 1875 | |
| 1876 | if (status == WLAN_STATUS_SUCCESS) { |
| 1877 | mutex_lock(&wk->sdata->u.mgd.mtx); |
| 1878 | if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { |
| 1879 | mutex_unlock(&wk->sdata->u.mgd.mtx); |
| 1880 | /* oops -- internal error -- send timeout for now */ |
| 1881 | cfg80211_send_assoc_timeout(wk->sdata->dev, |
| 1882 | wk->filter_ta); |
| 1883 | return WORK_DONE_DESTROY; |
| 1884 | } |
| 1885 | mutex_unlock(&wk->sdata->u.mgd.mtx); |
| 1886 | } |
| 1887 | |
| 1888 | cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); |
| 1889 | return WORK_DONE_DESTROY; |
| 1890 | } |
| 1891 | |
| 1892 | int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, |
| 1893 | struct cfg80211_assoc_request *req) |
| 1894 | { |
| 1895 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 1896 | struct ieee80211_bss *bss = (void *)req->bss->priv; |
| 1897 | struct ieee80211_work *wk; |
| 1898 | const u8 *ssid; |
| 1899 | int i; |
| 1900 | |
| 1901 | mutex_lock(&ifmgd->mtx); |
| 1902 | if (ifmgd->associated) { |
| 1903 | if (!req->prev_bssid || |
| 1904 | memcmp(req->prev_bssid, ifmgd->associated->bssid, |
| 1905 | ETH_ALEN)) { |
| 1906 | /* |
| 1907 | * We are already associated and the request was not a |
| 1908 | * reassociation request from the current BSS, so |
| 1909 | * reject it. |
| 1910 | */ |
| 1911 | mutex_unlock(&ifmgd->mtx); |
| 1912 | return -EALREADY; |
| 1913 | } |
| 1914 | |
| 1915 | /* Trying to reassociate - clear previous association state */ |
| 1916 | ieee80211_set_disassoc(sdata); |
| 1917 | } |
| 1918 | mutex_unlock(&ifmgd->mtx); |
| 1919 | |
| 1920 | wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); |
| 1921 | if (!wk) |
| 1922 | return -ENOMEM; |
| 1923 | |
| 1924 | ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; |
| 1925 | ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; |
| 1926 | |
| 1927 | for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) |
| 1928 | if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || |
| 1929 | req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || |
| 1930 | req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) |
| 1931 | ifmgd->flags |= IEEE80211_STA_DISABLE_11N; |
| 1932 | |
| 1933 | |
| 1934 | if (req->ie && req->ie_len) { |
| 1935 | memcpy(wk->ie, req->ie, req->ie_len); |
| 1936 | wk->ie_len = req->ie_len; |
| 1937 | } else |
| 1938 | wk->ie_len = 0; |
| 1939 | |
| 1940 | wk->assoc.bss = req->bss; |
| 1941 | |
| 1942 | memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); |
| 1943 | |
| 1944 | /* new association always uses requested smps mode */ |
| 1945 | if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { |
| 1946 | if (ifmgd->powersave) |
| 1947 | ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; |
| 1948 | else |
| 1949 | ifmgd->ap_smps = IEEE80211_SMPS_OFF; |
| 1950 | } else |
| 1951 | ifmgd->ap_smps = ifmgd->req_smps; |
| 1952 | |
| 1953 | wk->assoc.smps = ifmgd->ap_smps; |
| 1954 | /* |
| 1955 | * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. |
| 1956 | * We still associate in non-HT mode (11a/b/g) if any one of these |
| 1957 | * ciphers is configured as pairwise. |
| 1958 | * We can set this to true for non-11n hardware, that'll be checked |
| 1959 | * separately along with the peer capabilities. |
| 1960 | */ |
| 1961 | wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); |
| 1962 | wk->assoc.capability = req->bss->capability; |
| 1963 | wk->assoc.wmm_used = bss->wmm_used; |
| 1964 | wk->assoc.supp_rates = bss->supp_rates; |
| 1965 | wk->assoc.supp_rates_len = bss->supp_rates_len; |
| 1966 | wk->assoc.ht_information_ie = |
| 1967 | ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); |
| 1968 | |
| 1969 | if (bss->wmm_used && bss->uapsd_supported && |
| 1970 | (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { |
| 1971 | wk->assoc.uapsd_used = true; |
| 1972 | ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; |
| 1973 | } else { |
| 1974 | wk->assoc.uapsd_used = false; |
| 1975 | ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; |
| 1976 | } |
| 1977 | |
| 1978 | ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); |
| 1979 | memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); |
| 1980 | wk->assoc.ssid_len = ssid[1]; |
| 1981 | |
| 1982 | if (req->prev_bssid) |
| 1983 | memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); |
| 1984 | |
| 1985 | wk->type = IEEE80211_WORK_ASSOC; |
| 1986 | wk->chan = req->bss->channel; |
| 1987 | wk->sdata = sdata; |
| 1988 | wk->done = ieee80211_assoc_done; |
| 1989 | |
| 1990 | if (req->use_mfp) { |
| 1991 | ifmgd->mfp = IEEE80211_MFP_REQUIRED; |
| 1992 | ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; |
| 1993 | } else { |
| 1994 | ifmgd->mfp = IEEE80211_MFP_DISABLED; |
| 1995 | ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; |
| 1996 | } |
| 1997 | |
| 1998 | if (req->crypto.control_port) |
| 1999 | ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; |
| 2000 | else |
| 2001 | ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; |
| 2002 | |
| 2003 | ieee80211_add_work(wk); |
| 2004 | return 0; |
| 2005 | } |
| 2006 | |
| 2007 | int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, |
| 2008 | struct cfg80211_deauth_request *req, |
| 2009 | void *cookie) |
| 2010 | { |
| 2011 | struct ieee80211_local *local = sdata->local; |
| 2012 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 2013 | struct ieee80211_work *wk; |
| 2014 | const u8 *bssid = req->bss->bssid; |
| 2015 | |
| 2016 | mutex_lock(&ifmgd->mtx); |
| 2017 | |
| 2018 | if (ifmgd->associated == req->bss) { |
| 2019 | bssid = req->bss->bssid; |
| 2020 | ieee80211_set_disassoc(sdata); |
| 2021 | mutex_unlock(&ifmgd->mtx); |
| 2022 | } else { |
| 2023 | bool not_auth_yet = false; |
| 2024 | |
| 2025 | mutex_unlock(&ifmgd->mtx); |
| 2026 | |
| 2027 | mutex_lock(&local->work_mtx); |
| 2028 | list_for_each_entry(wk, &local->work_list, list) { |
| 2029 | if (wk->sdata != sdata) |
| 2030 | continue; |
| 2031 | |
| 2032 | if (wk->type != IEEE80211_WORK_DIRECT_PROBE && |
| 2033 | wk->type != IEEE80211_WORK_AUTH) |
| 2034 | continue; |
| 2035 | |
| 2036 | if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) |
| 2037 | continue; |
| 2038 | |
| 2039 | not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; |
| 2040 | list_del_rcu(&wk->list); |
| 2041 | free_work(wk); |
| 2042 | break; |
| 2043 | } |
| 2044 | mutex_unlock(&local->work_mtx); |
| 2045 | |
| 2046 | /* |
| 2047 | * If somebody requests authentication and we haven't |
| 2048 | * sent out an auth frame yet there's no need to send |
| 2049 | * out a deauth frame either. If the state was PROBE, |
| 2050 | * then this is the case. If it's AUTH we have sent a |
| 2051 | * frame, and if it's IDLE we have completed the auth |
| 2052 | * process already. |
| 2053 | */ |
| 2054 | if (not_auth_yet) { |
| 2055 | __cfg80211_auth_canceled(sdata->dev, bssid); |
| 2056 | return 0; |
| 2057 | } |
| 2058 | } |
| 2059 | |
| 2060 | printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", |
| 2061 | sdata->name, bssid, req->reason_code); |
| 2062 | |
| 2063 | ieee80211_send_deauth_disassoc(sdata, bssid, |
| 2064 | IEEE80211_STYPE_DEAUTH, req->reason_code, |
| 2065 | cookie); |
| 2066 | |
| 2067 | ieee80211_recalc_idle(sdata->local); |
| 2068 | |
| 2069 | return 0; |
| 2070 | } |
| 2071 | |
| 2072 | int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, |
| 2073 | struct cfg80211_disassoc_request *req, |
| 2074 | void *cookie) |
| 2075 | { |
| 2076 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 2077 | |
| 2078 | mutex_lock(&ifmgd->mtx); |
| 2079 | |
| 2080 | /* |
| 2081 | * cfg80211 should catch this ... but it's racy since |
| 2082 | * we can receive a disassoc frame, process it, hand it |
| 2083 | * to cfg80211 while that's in a locked section already |
| 2084 | * trying to tell us that the user wants to disconnect. |
| 2085 | */ |
| 2086 | if (ifmgd->associated != req->bss) { |
| 2087 | mutex_unlock(&ifmgd->mtx); |
| 2088 | return -ENOLINK; |
| 2089 | } |
| 2090 | |
| 2091 | printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", |
| 2092 | sdata->name, req->bss->bssid, req->reason_code); |
| 2093 | |
| 2094 | ieee80211_set_disassoc(sdata); |
| 2095 | |
| 2096 | mutex_unlock(&ifmgd->mtx); |
| 2097 | |
| 2098 | ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, |
| 2099 | IEEE80211_STYPE_DISASSOC, req->reason_code, |
| 2100 | cookie); |
| 2101 | |
| 2102 | ieee80211_recalc_idle(sdata->local); |
| 2103 | |
| 2104 | return 0; |
| 2105 | } |
| 2106 | |
| 2107 | int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata, |
| 2108 | struct ieee80211_channel *chan, |
| 2109 | enum nl80211_channel_type channel_type, |
| 2110 | const u8 *buf, size_t len, u64 *cookie) |
| 2111 | { |
| 2112 | struct ieee80211_local *local = sdata->local; |
| 2113 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| 2114 | struct sk_buff *skb; |
| 2115 | |
| 2116 | /* Check that we are on the requested channel for transmission */ |
| 2117 | if ((chan != local->tmp_channel || |
| 2118 | channel_type != local->tmp_channel_type) && |
| 2119 | (chan != local->oper_channel || |
| 2120 | channel_type != local->oper_channel_type)) |
| 2121 | return -EBUSY; |
| 2122 | |
| 2123 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + len); |
| 2124 | if (!skb) |
| 2125 | return -ENOMEM; |
| 2126 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 2127 | |
| 2128 | memcpy(skb_put(skb, len), buf, len); |
| 2129 | |
| 2130 | if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) |
| 2131 | IEEE80211_SKB_CB(skb)->flags |= |
| 2132 | IEEE80211_TX_INTFL_DONT_ENCRYPT; |
| 2133 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX | |
| 2134 | IEEE80211_TX_CTL_REQ_TX_STATUS; |
| 2135 | skb->dev = sdata->dev; |
| 2136 | ieee80211_tx_skb(sdata, skb); |
| 2137 | |
| 2138 | *cookie = (unsigned long) skb; |
| 2139 | return 0; |
| 2140 | } |