mlme.c 64 KB

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  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. #include <linux/delay.h>
  14. #include <linux/if_ether.h>
  15. #include <linux/skbuff.h>
  16. #include <linux/if_arp.h>
  17. #include <linux/etherdevice.h>
  18. #include <linux/rtnetlink.h>
  19. #include <linux/pm_qos_params.h>
  20. #include <linux/crc32.h>
  21. #include <linux/slab.h>
  22. #include <net/mac80211.h>
  23. #include <asm/unaligned.h>
  24. #include "ieee80211_i.h"
  25. #include "driver-ops.h"
  26. #include "rate.h"
  27. #include "led.h"
  28. #define IEEE80211_MAX_PROBE_TRIES 5
  29. /*
  30. * beacon loss detection timeout
  31. * XXX: should depend on beacon interval
  32. */
  33. #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
  34. /*
  35. * Time the connection can be idle before we probe
  36. * it to see if we can still talk to the AP.
  37. */
  38. #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
  39. /*
  40. * Time we wait for a probe response after sending
  41. * a probe request because of beacon loss or for
  42. * checking the connection still works.
  43. */
  44. #define IEEE80211_PROBE_WAIT (HZ / 2)
  45. /*
  46. * Weight given to the latest Beacon frame when calculating average signal
  47. * strength for Beacon frames received in the current BSS. This must be
  48. * between 1 and 15.
  49. */
  50. #define IEEE80211_SIGNAL_AVE_WEIGHT 3
  51. #define TMR_RUNNING_TIMER 0
  52. #define TMR_RUNNING_CHANSW 1
  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. /* caller must call cfg80211_send_rx_auth() */
  63. RX_MGMT_CFG80211_AUTH,
  64. /* caller must call cfg80211_send_rx_assoc() */
  65. RX_MGMT_CFG80211_ASSOC,
  66. /* caller must call cfg80211_send_deauth() */
  67. RX_MGMT_CFG80211_DEAUTH,
  68. /* caller must call cfg80211_send_disassoc() */
  69. RX_MGMT_CFG80211_DISASSOC,
  70. /* caller must tell cfg80211 about internal error */
  71. RX_MGMT_CFG80211_ASSOC_ERROR,
  72. };
  73. /* utils */
  74. static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  75. {
  76. WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  77. }
  78. /*
  79. * We can have multiple work items (and connection probing)
  80. * scheduling this timer, but we need to take care to only
  81. * reschedule it when it should fire _earlier_ than it was
  82. * asked for before, or if it's not pending right now. This
  83. * function ensures that. Note that it then is required to
  84. * run this function for all timeouts after the first one
  85. * has happened -- the work that runs from this timer will
  86. * do that.
  87. */
  88. static void run_again(struct ieee80211_if_managed *ifmgd,
  89. unsigned long timeout)
  90. {
  91. ASSERT_MGD_MTX(ifmgd);
  92. if (!timer_pending(&ifmgd->timer) ||
  93. time_before(timeout, ifmgd->timer.expires))
  94. mod_timer(&ifmgd->timer, timeout);
  95. }
  96. static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
  97. {
  98. if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
  99. return;
  100. mod_timer(&sdata->u.mgd.bcn_mon_timer,
  101. round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
  102. }
  103. static int ecw2cw(int ecw)
  104. {
  105. return (1 << ecw) - 1;
  106. }
  107. /*
  108. * ieee80211_enable_ht should be called only after the operating band
  109. * has been determined as ht configuration depends on the hw's
  110. * HT abilities for a specific band.
  111. */
  112. static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  113. struct ieee80211_ht_info *hti,
  114. const u8 *bssid, u16 ap_ht_cap_flags)
  115. {
  116. struct ieee80211_local *local = sdata->local;
  117. struct ieee80211_supported_band *sband;
  118. struct sta_info *sta;
  119. u32 changed = 0;
  120. u16 ht_opmode;
  121. bool enable_ht = true;
  122. enum nl80211_channel_type prev_chantype;
  123. enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
  124. sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
  125. prev_chantype = sdata->vif.bss_conf.channel_type;
  126. /* HT is not supported */
  127. if (!sband->ht_cap.ht_supported)
  128. enable_ht = false;
  129. /* check that channel matches the right operating channel */
  130. if (local->hw.conf.channel->center_freq !=
  131. ieee80211_channel_to_frequency(hti->control_chan))
  132. enable_ht = false;
  133. if (enable_ht) {
  134. channel_type = NL80211_CHAN_HT20;
  135. if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
  136. (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
  137. (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
  138. switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
  139. case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
  140. if (!(local->hw.conf.channel->flags &
  141. IEEE80211_CHAN_NO_HT40PLUS))
  142. channel_type = NL80211_CHAN_HT40PLUS;
  143. break;
  144. case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
  145. if (!(local->hw.conf.channel->flags &
  146. IEEE80211_CHAN_NO_HT40MINUS))
  147. channel_type = NL80211_CHAN_HT40MINUS;
  148. break;
  149. }
  150. }
  151. }
  152. if (local->tmp_channel)
  153. local->tmp_channel_type = channel_type;
  154. if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
  155. /* can only fail due to HT40+/- mismatch */
  156. channel_type = NL80211_CHAN_HT20;
  157. WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
  158. }
  159. /* channel_type change automatically detected */
  160. ieee80211_hw_config(local, 0);
  161. if (prev_chantype != channel_type) {
  162. rcu_read_lock();
  163. sta = sta_info_get(sdata, bssid);
  164. if (sta)
  165. rate_control_rate_update(local, sband, sta,
  166. IEEE80211_RC_HT_CHANGED,
  167. channel_type);
  168. rcu_read_unlock();
  169. }
  170. ht_opmode = le16_to_cpu(hti->operation_mode);
  171. /* if bss configuration changed store the new one */
  172. if (sdata->ht_opmode_valid != enable_ht ||
  173. sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
  174. prev_chantype != channel_type) {
  175. changed |= BSS_CHANGED_HT;
  176. sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
  177. sdata->ht_opmode_valid = enable_ht;
  178. }
  179. return changed;
  180. }
  181. /* frame sending functions */
  182. static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
  183. const u8 *bssid, u16 stype, u16 reason,
  184. void *cookie, bool send_frame)
  185. {
  186. struct ieee80211_local *local = sdata->local;
  187. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  188. struct sk_buff *skb;
  189. struct ieee80211_mgmt *mgmt;
  190. skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
  191. if (!skb) {
  192. printk(KERN_DEBUG "%s: failed to allocate buffer for "
  193. "deauth/disassoc frame\n", sdata->name);
  194. return;
  195. }
  196. skb_reserve(skb, local->hw.extra_tx_headroom);
  197. mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
  198. memset(mgmt, 0, 24);
  199. memcpy(mgmt->da, bssid, ETH_ALEN);
  200. memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  201. memcpy(mgmt->bssid, bssid, ETH_ALEN);
  202. mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
  203. skb_put(skb, 2);
  204. /* u.deauth.reason_code == u.disassoc.reason_code */
  205. mgmt->u.deauth.reason_code = cpu_to_le16(reason);
  206. if (stype == IEEE80211_STYPE_DEAUTH)
  207. if (cookie)
  208. __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
  209. else
  210. cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
  211. else
  212. if (cookie)
  213. __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
  214. else
  215. cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
  216. if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
  217. IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
  218. if (send_frame)
  219. ieee80211_tx_skb(sdata, skb);
  220. else
  221. kfree_skb(skb);
  222. }
  223. void ieee80211_send_pspoll(struct ieee80211_local *local,
  224. struct ieee80211_sub_if_data *sdata)
  225. {
  226. struct ieee80211_pspoll *pspoll;
  227. struct sk_buff *skb;
  228. skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
  229. if (!skb)
  230. return;
  231. pspoll = (struct ieee80211_pspoll *) skb->data;
  232. pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
  233. IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
  234. ieee80211_tx_skb(sdata, skb);
  235. }
  236. void ieee80211_send_nullfunc(struct ieee80211_local *local,
  237. struct ieee80211_sub_if_data *sdata,
  238. int powersave)
  239. {
  240. struct sk_buff *skb;
  241. struct ieee80211_hdr_3addr *nullfunc;
  242. skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
  243. if (!skb)
  244. return;
  245. nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
  246. if (powersave)
  247. nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
  248. IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
  249. ieee80211_tx_skb(sdata, skb);
  250. }
  251. static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
  252. struct ieee80211_sub_if_data *sdata)
  253. {
  254. struct sk_buff *skb;
  255. struct ieee80211_hdr *nullfunc;
  256. __le16 fc;
  257. if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
  258. return;
  259. skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
  260. if (!skb) {
  261. printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
  262. "nullfunc frame\n", sdata->name);
  263. return;
  264. }
  265. skb_reserve(skb, local->hw.extra_tx_headroom);
  266. nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
  267. memset(nullfunc, 0, 30);
  268. fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
  269. IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
  270. nullfunc->frame_control = fc;
  271. memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
  272. memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
  273. memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
  274. memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
  275. IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
  276. ieee80211_tx_skb(sdata, skb);
  277. }
  278. /* spectrum management related things */
  279. static void ieee80211_chswitch_work(struct work_struct *work)
  280. {
  281. struct ieee80211_sub_if_data *sdata =
  282. container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
  283. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  284. if (!ieee80211_sdata_running(sdata))
  285. return;
  286. mutex_lock(&ifmgd->mtx);
  287. if (!ifmgd->associated)
  288. goto out;
  289. sdata->local->oper_channel = sdata->local->csa_channel;
  290. if (!sdata->local->ops->channel_switch) {
  291. /* call "hw_config" only if doing sw channel switch */
  292. ieee80211_hw_config(sdata->local,
  293. IEEE80211_CONF_CHANGE_CHANNEL);
  294. }
  295. /* XXX: shouldn't really modify cfg80211-owned data! */
  296. ifmgd->associated->channel = sdata->local->oper_channel;
  297. ieee80211_wake_queues_by_reason(&sdata->local->hw,
  298. IEEE80211_QUEUE_STOP_REASON_CSA);
  299. out:
  300. ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
  301. mutex_unlock(&ifmgd->mtx);
  302. }
  303. void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
  304. {
  305. struct ieee80211_sub_if_data *sdata;
  306. struct ieee80211_if_managed *ifmgd;
  307. sdata = vif_to_sdata(vif);
  308. ifmgd = &sdata->u.mgd;
  309. trace_api_chswitch_done(sdata, success);
  310. if (!success) {
  311. /*
  312. * If the channel switch was not successful, stay
  313. * around on the old channel. We currently lack
  314. * good handling of this situation, possibly we
  315. * should just drop the association.
  316. */
  317. sdata->local->csa_channel = sdata->local->oper_channel;
  318. }
  319. ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
  320. }
  321. EXPORT_SYMBOL(ieee80211_chswitch_done);
  322. static void ieee80211_chswitch_timer(unsigned long data)
  323. {
  324. struct ieee80211_sub_if_data *sdata =
  325. (struct ieee80211_sub_if_data *) data;
  326. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  327. if (sdata->local->quiescing) {
  328. set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
  329. return;
  330. }
  331. ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
  332. }
  333. void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
  334. struct ieee80211_channel_sw_ie *sw_elem,
  335. struct ieee80211_bss *bss,
  336. u64 timestamp)
  337. {
  338. struct cfg80211_bss *cbss =
  339. container_of((void *)bss, struct cfg80211_bss, priv);
  340. struct ieee80211_channel *new_ch;
  341. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  342. int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
  343. ASSERT_MGD_MTX(ifmgd);
  344. if (!ifmgd->associated)
  345. return;
  346. if (sdata->local->scanning)
  347. return;
  348. /* Disregard subsequent beacons if we are already running a timer
  349. processing a CSA */
  350. if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
  351. return;
  352. new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
  353. if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
  354. return;
  355. sdata->local->csa_channel = new_ch;
  356. if (sdata->local->ops->channel_switch) {
  357. /* use driver's channel switch callback */
  358. struct ieee80211_channel_switch ch_switch;
  359. memset(&ch_switch, 0, sizeof(ch_switch));
  360. ch_switch.timestamp = timestamp;
  361. if (sw_elem->mode) {
  362. ch_switch.block_tx = true;
  363. ieee80211_stop_queues_by_reason(&sdata->local->hw,
  364. IEEE80211_QUEUE_STOP_REASON_CSA);
  365. }
  366. ch_switch.channel = new_ch;
  367. ch_switch.count = sw_elem->count;
  368. ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
  369. drv_channel_switch(sdata->local, &ch_switch);
  370. return;
  371. }
  372. /* channel switch handled in software */
  373. if (sw_elem->count <= 1) {
  374. ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
  375. } else {
  376. if (sw_elem->mode)
  377. ieee80211_stop_queues_by_reason(&sdata->local->hw,
  378. IEEE80211_QUEUE_STOP_REASON_CSA);
  379. ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
  380. mod_timer(&ifmgd->chswitch_timer,
  381. jiffies +
  382. msecs_to_jiffies(sw_elem->count *
  383. cbss->beacon_interval));
  384. }
  385. }
  386. static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
  387. u16 capab_info, u8 *pwr_constr_elem,
  388. u8 pwr_constr_elem_len)
  389. {
  390. struct ieee80211_conf *conf = &sdata->local->hw.conf;
  391. if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
  392. return;
  393. /* Power constraint IE length should be 1 octet */
  394. if (pwr_constr_elem_len != 1)
  395. return;
  396. if ((*pwr_constr_elem <= conf->channel->max_power) &&
  397. (*pwr_constr_elem != sdata->local->power_constr_level)) {
  398. sdata->local->power_constr_level = *pwr_constr_elem;
  399. ieee80211_hw_config(sdata->local, 0);
  400. }
  401. }
  402. /* powersave */
  403. static void ieee80211_enable_ps(struct ieee80211_local *local,
  404. struct ieee80211_sub_if_data *sdata)
  405. {
  406. struct ieee80211_conf *conf = &local->hw.conf;
  407. /*
  408. * If we are scanning right now then the parameters will
  409. * take effect when scan finishes.
  410. */
  411. if (local->scanning)
  412. return;
  413. if (conf->dynamic_ps_timeout > 0 &&
  414. !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
  415. mod_timer(&local->dynamic_ps_timer, jiffies +
  416. msecs_to_jiffies(conf->dynamic_ps_timeout));
  417. } else {
  418. if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
  419. ieee80211_send_nullfunc(local, sdata, 1);
  420. if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
  421. (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
  422. return;
  423. conf->flags |= IEEE80211_CONF_PS;
  424. ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
  425. }
  426. }
  427. static void ieee80211_change_ps(struct ieee80211_local *local)
  428. {
  429. struct ieee80211_conf *conf = &local->hw.conf;
  430. if (local->ps_sdata) {
  431. ieee80211_enable_ps(local, local->ps_sdata);
  432. } else if (conf->flags & IEEE80211_CONF_PS) {
  433. conf->flags &= ~IEEE80211_CONF_PS;
  434. ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
  435. del_timer_sync(&local->dynamic_ps_timer);
  436. cancel_work_sync(&local->dynamic_ps_enable_work);
  437. }
  438. }
  439. /* need to hold RTNL or interface lock */
  440. void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
  441. {
  442. struct ieee80211_sub_if_data *sdata, *found = NULL;
  443. int count = 0;
  444. int timeout;
  445. if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
  446. local->ps_sdata = NULL;
  447. return;
  448. }
  449. if (!list_empty(&local->work_list)) {
  450. local->ps_sdata = NULL;
  451. goto change;
  452. }
  453. list_for_each_entry(sdata, &local->interfaces, list) {
  454. if (!ieee80211_sdata_running(sdata))
  455. continue;
  456. if (sdata->vif.type != NL80211_IFTYPE_STATION)
  457. continue;
  458. found = sdata;
  459. count++;
  460. }
  461. if (count == 1 && found->u.mgd.powersave &&
  462. found->u.mgd.associated &&
  463. found->u.mgd.associated->beacon_ies &&
  464. !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
  465. IEEE80211_STA_CONNECTION_POLL))) {
  466. s32 beaconint_us;
  467. if (latency < 0)
  468. latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
  469. beaconint_us = ieee80211_tu_to_usec(
  470. found->vif.bss_conf.beacon_int);
  471. timeout = local->hw.conf.dynamic_ps_forced_timeout;
  472. if (timeout < 0) {
  473. /*
  474. * The 2 second value is there for compatibility until
  475. * the PM_QOS_NETWORK_LATENCY is configured with real
  476. * values.
  477. */
  478. if (latency == 2000000000)
  479. timeout = 100;
  480. else if (latency <= 50000)
  481. timeout = 300;
  482. else if (latency <= 100000)
  483. timeout = 100;
  484. else if (latency <= 500000)
  485. timeout = 50;
  486. else
  487. timeout = 0;
  488. }
  489. local->hw.conf.dynamic_ps_timeout = timeout;
  490. if (beaconint_us > latency) {
  491. local->ps_sdata = NULL;
  492. } else {
  493. struct ieee80211_bss *bss;
  494. int maxslp = 1;
  495. u8 dtimper;
  496. bss = (void *)found->u.mgd.associated->priv;
  497. dtimper = bss->dtim_period;
  498. /* If the TIM IE is invalid, pretend the value is 1 */
  499. if (!dtimper)
  500. dtimper = 1;
  501. else if (dtimper > 1)
  502. maxslp = min_t(int, dtimper,
  503. latency / beaconint_us);
  504. local->hw.conf.max_sleep_period = maxslp;
  505. local->hw.conf.ps_dtim_period = dtimper;
  506. local->ps_sdata = found;
  507. }
  508. } else {
  509. local->ps_sdata = NULL;
  510. }
  511. change:
  512. ieee80211_change_ps(local);
  513. }
  514. void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
  515. {
  516. struct ieee80211_local *local =
  517. container_of(work, struct ieee80211_local,
  518. dynamic_ps_disable_work);
  519. if (local->hw.conf.flags & IEEE80211_CONF_PS) {
  520. local->hw.conf.flags &= ~IEEE80211_CONF_PS;
  521. ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
  522. }
  523. ieee80211_wake_queues_by_reason(&local->hw,
  524. IEEE80211_QUEUE_STOP_REASON_PS);
  525. }
  526. void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
  527. {
  528. struct ieee80211_local *local =
  529. container_of(work, struct ieee80211_local,
  530. dynamic_ps_enable_work);
  531. struct ieee80211_sub_if_data *sdata = local->ps_sdata;
  532. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  533. /* can only happen when PS was just disabled anyway */
  534. if (!sdata)
  535. return;
  536. if (local->hw.conf.flags & IEEE80211_CONF_PS)
  537. return;
  538. if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
  539. (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
  540. ieee80211_send_nullfunc(local, sdata, 1);
  541. if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
  542. (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
  543. (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
  544. ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
  545. local->hw.conf.flags |= IEEE80211_CONF_PS;
  546. ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
  547. }
  548. }
  549. void ieee80211_dynamic_ps_timer(unsigned long data)
  550. {
  551. struct ieee80211_local *local = (void *) data;
  552. if (local->quiescing || local->suspended)
  553. return;
  554. ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
  555. }
  556. /* MLME */
  557. static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
  558. struct ieee80211_if_managed *ifmgd,
  559. u8 *wmm_param, size_t wmm_param_len)
  560. {
  561. struct ieee80211_tx_queue_params params;
  562. size_t left;
  563. int count;
  564. u8 *pos, uapsd_queues = 0;
  565. if (!local->ops->conf_tx)
  566. return;
  567. if (local->hw.queues < 4)
  568. return;
  569. if (!wmm_param)
  570. return;
  571. if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
  572. return;
  573. if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
  574. uapsd_queues = local->uapsd_queues;
  575. count = wmm_param[6] & 0x0f;
  576. if (count == ifmgd->wmm_last_param_set)
  577. return;
  578. ifmgd->wmm_last_param_set = count;
  579. pos = wmm_param + 8;
  580. left = wmm_param_len - 8;
  581. memset(&params, 0, sizeof(params));
  582. local->wmm_acm = 0;
  583. for (; left >= 4; left -= 4, pos += 4) {
  584. int aci = (pos[0] >> 5) & 0x03;
  585. int acm = (pos[0] >> 4) & 0x01;
  586. bool uapsd = false;
  587. int queue;
  588. switch (aci) {
  589. case 1: /* AC_BK */
  590. queue = 3;
  591. if (acm)
  592. local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
  593. if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
  594. uapsd = true;
  595. break;
  596. case 2: /* AC_VI */
  597. queue = 1;
  598. if (acm)
  599. local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
  600. if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
  601. uapsd = true;
  602. break;
  603. case 3: /* AC_VO */
  604. queue = 0;
  605. if (acm)
  606. local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
  607. if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
  608. uapsd = true;
  609. break;
  610. case 0: /* AC_BE */
  611. default:
  612. queue = 2;
  613. if (acm)
  614. local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
  615. if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
  616. uapsd = true;
  617. break;
  618. }
  619. params.aifs = pos[0] & 0x0f;
  620. params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
  621. params.cw_min = ecw2cw(pos[1] & 0x0f);
  622. params.txop = get_unaligned_le16(pos + 2);
  623. params.uapsd = uapsd;
  624. #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  625. printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
  626. "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
  627. wiphy_name(local->hw.wiphy), queue, aci, acm,
  628. params.aifs, params.cw_min, params.cw_max, params.txop,
  629. params.uapsd);
  630. #endif
  631. if (drv_conf_tx(local, queue, &params))
  632. printk(KERN_DEBUG "%s: failed to set TX queue "
  633. "parameters for queue %d\n",
  634. wiphy_name(local->hw.wiphy), queue);
  635. }
  636. /* enable WMM or activate new settings */
  637. local->hw.conf.flags |= IEEE80211_CONF_QOS;
  638. drv_config(local, IEEE80211_CONF_CHANGE_QOS);
  639. }
  640. static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
  641. u16 capab, bool erp_valid, u8 erp)
  642. {
  643. struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
  644. u32 changed = 0;
  645. bool use_protection;
  646. bool use_short_preamble;
  647. bool use_short_slot;
  648. if (erp_valid) {
  649. use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
  650. use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
  651. } else {
  652. use_protection = false;
  653. use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
  654. }
  655. use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
  656. if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
  657. use_short_slot = true;
  658. if (use_protection != bss_conf->use_cts_prot) {
  659. bss_conf->use_cts_prot = use_protection;
  660. changed |= BSS_CHANGED_ERP_CTS_PROT;
  661. }
  662. if (use_short_preamble != bss_conf->use_short_preamble) {
  663. bss_conf->use_short_preamble = use_short_preamble;
  664. changed |= BSS_CHANGED_ERP_PREAMBLE;
  665. }
  666. if (use_short_slot != bss_conf->use_short_slot) {
  667. bss_conf->use_short_slot = use_short_slot;
  668. changed |= BSS_CHANGED_ERP_SLOT;
  669. }
  670. return changed;
  671. }
  672. static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
  673. struct cfg80211_bss *cbss,
  674. u32 bss_info_changed)
  675. {
  676. struct ieee80211_bss *bss = (void *)cbss->priv;
  677. struct ieee80211_local *local = sdata->local;
  678. bss_info_changed |= BSS_CHANGED_ASSOC;
  679. /* set timing information */
  680. sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
  681. sdata->vif.bss_conf.timestamp = cbss->tsf;
  682. bss_info_changed |= BSS_CHANGED_BEACON_INT;
  683. bss_info_changed |= ieee80211_handle_bss_capability(sdata,
  684. cbss->capability, bss->has_erp_value, bss->erp_value);
  685. sdata->u.mgd.associated = cbss;
  686. memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
  687. sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
  688. /* just to be sure */
  689. sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
  690. IEEE80211_STA_BEACON_POLL);
  691. /*
  692. * Always handle WMM once after association regardless
  693. * of the first value the AP uses. Setting -1 here has
  694. * that effect because the AP values is an unsigned
  695. * 4-bit value.
  696. */
  697. sdata->u.mgd.wmm_last_param_set = -1;
  698. ieee80211_led_assoc(local, 1);
  699. sdata->vif.bss_conf.assoc = 1;
  700. /*
  701. * For now just always ask the driver to update the basic rateset
  702. * when we have associated, we aren't checking whether it actually
  703. * changed or not.
  704. */
  705. bss_info_changed |= BSS_CHANGED_BASIC_RATES;
  706. /* And the BSSID changed - we're associated now */
  707. bss_info_changed |= BSS_CHANGED_BSSID;
  708. /* Tell the driver to monitor connection quality (if supported) */
  709. if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
  710. sdata->vif.bss_conf.cqm_rssi_thold)
  711. bss_info_changed |= BSS_CHANGED_CQM;
  712. ieee80211_bss_info_change_notify(sdata, bss_info_changed);
  713. mutex_lock(&local->iflist_mtx);
  714. ieee80211_recalc_ps(local, -1);
  715. ieee80211_recalc_smps(local, sdata);
  716. mutex_unlock(&local->iflist_mtx);
  717. netif_tx_start_all_queues(sdata->dev);
  718. netif_carrier_on(sdata->dev);
  719. }
  720. static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
  721. bool remove_sta)
  722. {
  723. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  724. struct ieee80211_local *local = sdata->local;
  725. struct sta_info *sta;
  726. u32 changed = 0, config_changed = 0;
  727. u8 bssid[ETH_ALEN];
  728. ASSERT_MGD_MTX(ifmgd);
  729. if (WARN_ON(!ifmgd->associated))
  730. return;
  731. memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
  732. ifmgd->associated = NULL;
  733. memset(ifmgd->bssid, 0, ETH_ALEN);
  734. /*
  735. * we need to commit the associated = NULL change because the
  736. * scan code uses that to determine whether this iface should
  737. * go to/wake up from powersave or not -- and could otherwise
  738. * wake the queues erroneously.
  739. */
  740. smp_mb();
  741. /*
  742. * Thus, we can only afterwards stop the queues -- to account
  743. * for the case where another CPU is finishing a scan at this
  744. * time -- we don't want the scan code to enable queues.
  745. */
  746. netif_tx_stop_all_queues(sdata->dev);
  747. netif_carrier_off(sdata->dev);
  748. rcu_read_lock();
  749. sta = sta_info_get(sdata, bssid);
  750. if (sta) {
  751. set_sta_flags(sta, WLAN_STA_DISASSOC);
  752. ieee80211_sta_tear_down_BA_sessions(sta);
  753. }
  754. rcu_read_unlock();
  755. changed |= ieee80211_reset_erp_info(sdata);
  756. ieee80211_led_assoc(local, 0);
  757. changed |= BSS_CHANGED_ASSOC;
  758. sdata->vif.bss_conf.assoc = false;
  759. ieee80211_set_wmm_default(sdata);
  760. /* channel(_type) changes are handled by ieee80211_hw_config */
  761. WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
  762. /* on the next assoc, re-program HT parameters */
  763. sdata->ht_opmode_valid = false;
  764. local->power_constr_level = 0;
  765. del_timer_sync(&local->dynamic_ps_timer);
  766. cancel_work_sync(&local->dynamic_ps_enable_work);
  767. if (local->hw.conf.flags & IEEE80211_CONF_PS) {
  768. local->hw.conf.flags &= ~IEEE80211_CONF_PS;
  769. config_changed |= IEEE80211_CONF_CHANGE_PS;
  770. }
  771. ieee80211_hw_config(local, config_changed);
  772. /* The BSSID (not really interesting) and HT changed */
  773. changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
  774. ieee80211_bss_info_change_notify(sdata, changed);
  775. if (remove_sta)
  776. sta_info_destroy_addr(sdata, bssid);
  777. }
  778. void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
  779. struct ieee80211_hdr *hdr)
  780. {
  781. /*
  782. * We can postpone the mgd.timer whenever receiving unicast frames
  783. * from AP because we know that the connection is working both ways
  784. * at that time. But multicast frames (and hence also beacons) must
  785. * be ignored here, because we need to trigger the timer during
  786. * data idle periods for sending the periodic probe request to the
  787. * AP we're connected to.
  788. */
  789. if (is_multicast_ether_addr(hdr->addr1))
  790. return;
  791. if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
  792. return;
  793. mod_timer(&sdata->u.mgd.conn_mon_timer,
  794. round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
  795. }
  796. static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
  797. {
  798. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  799. const u8 *ssid;
  800. ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
  801. ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
  802. ssid + 2, ssid[1], NULL, 0);
  803. ifmgd->probe_send_count++;
  804. ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
  805. run_again(ifmgd, ifmgd->probe_timeout);
  806. }
  807. static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
  808. bool beacon)
  809. {
  810. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  811. bool already = false;
  812. if (!ieee80211_sdata_running(sdata))
  813. return;
  814. if (sdata->local->scanning)
  815. return;
  816. if (sdata->local->tmp_channel)
  817. return;
  818. mutex_lock(&ifmgd->mtx);
  819. if (!ifmgd->associated)
  820. goto out;
  821. #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  822. if (beacon && net_ratelimit())
  823. printk(KERN_DEBUG "%s: detected beacon loss from AP "
  824. "- sending probe request\n", sdata->name);
  825. #endif
  826. /*
  827. * The driver/our work has already reported this event or the
  828. * connection monitoring has kicked in and we have already sent
  829. * a probe request. Or maybe the AP died and the driver keeps
  830. * reporting until we disassociate...
  831. *
  832. * In either case we have to ignore the current call to this
  833. * function (except for setting the correct probe reason bit)
  834. * because otherwise we would reset the timer every time and
  835. * never check whether we received a probe response!
  836. */
  837. if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
  838. IEEE80211_STA_CONNECTION_POLL))
  839. already = true;
  840. if (beacon)
  841. ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
  842. else
  843. ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
  844. if (already)
  845. goto out;
  846. mutex_lock(&sdata->local->iflist_mtx);
  847. ieee80211_recalc_ps(sdata->local, -1);
  848. mutex_unlock(&sdata->local->iflist_mtx);
  849. ifmgd->probe_send_count = 0;
  850. ieee80211_mgd_probe_ap_send(sdata);
  851. out:
  852. mutex_unlock(&ifmgd->mtx);
  853. }
  854. static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
  855. {
  856. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  857. struct ieee80211_local *local = sdata->local;
  858. u8 bssid[ETH_ALEN];
  859. mutex_lock(&ifmgd->mtx);
  860. if (!ifmgd->associated) {
  861. mutex_unlock(&ifmgd->mtx);
  862. return;
  863. }
  864. memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
  865. printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
  866. ieee80211_set_disassoc(sdata, true);
  867. ieee80211_recalc_idle(local);
  868. mutex_unlock(&ifmgd->mtx);
  869. /*
  870. * must be outside lock due to cfg80211,
  871. * but that's not a problem.
  872. */
  873. ieee80211_send_deauth_disassoc(sdata, bssid,
  874. IEEE80211_STYPE_DEAUTH,
  875. WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
  876. NULL, true);
  877. }
  878. void ieee80211_beacon_connection_loss_work(struct work_struct *work)
  879. {
  880. struct ieee80211_sub_if_data *sdata =
  881. container_of(work, struct ieee80211_sub_if_data,
  882. u.mgd.beacon_connection_loss_work);
  883. if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
  884. __ieee80211_connection_loss(sdata);
  885. else
  886. ieee80211_mgd_probe_ap(sdata, true);
  887. }
  888. void ieee80211_beacon_loss(struct ieee80211_vif *vif)
  889. {
  890. struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
  891. struct ieee80211_hw *hw = &sdata->local->hw;
  892. trace_api_beacon_loss(sdata);
  893. WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
  894. ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
  895. }
  896. EXPORT_SYMBOL(ieee80211_beacon_loss);
  897. void ieee80211_connection_loss(struct ieee80211_vif *vif)
  898. {
  899. struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
  900. struct ieee80211_hw *hw = &sdata->local->hw;
  901. trace_api_connection_loss(sdata);
  902. WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
  903. ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
  904. }
  905. EXPORT_SYMBOL(ieee80211_connection_loss);
  906. static enum rx_mgmt_action __must_check
  907. ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
  908. struct ieee80211_mgmt *mgmt, size_t len)
  909. {
  910. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  911. const u8 *bssid = NULL;
  912. u16 reason_code;
  913. if (len < 24 + 2)
  914. return RX_MGMT_NONE;
  915. ASSERT_MGD_MTX(ifmgd);
  916. bssid = ifmgd->associated->bssid;
  917. reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
  918. printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
  919. sdata->name, bssid, reason_code);
  920. ieee80211_set_disassoc(sdata, true);
  921. ieee80211_recalc_idle(sdata->local);
  922. return RX_MGMT_CFG80211_DEAUTH;
  923. }
  924. static enum rx_mgmt_action __must_check
  925. ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
  926. struct ieee80211_mgmt *mgmt, size_t len)
  927. {
  928. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  929. u16 reason_code;
  930. if (len < 24 + 2)
  931. return RX_MGMT_NONE;
  932. ASSERT_MGD_MTX(ifmgd);
  933. if (WARN_ON(!ifmgd->associated))
  934. return RX_MGMT_NONE;
  935. if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
  936. return RX_MGMT_NONE;
  937. reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
  938. printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
  939. sdata->name, mgmt->sa, reason_code);
  940. ieee80211_set_disassoc(sdata, true);
  941. ieee80211_recalc_idle(sdata->local);
  942. return RX_MGMT_CFG80211_DISASSOC;
  943. }
  944. static bool ieee80211_assoc_success(struct ieee80211_work *wk,
  945. struct ieee80211_mgmt *mgmt, size_t len)
  946. {
  947. struct ieee80211_sub_if_data *sdata = wk->sdata;
  948. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  949. struct ieee80211_local *local = sdata->local;
  950. struct ieee80211_supported_band *sband;
  951. struct sta_info *sta;
  952. struct cfg80211_bss *cbss = wk->assoc.bss;
  953. u8 *pos;
  954. u32 rates, basic_rates;
  955. u16 capab_info, aid;
  956. struct ieee802_11_elems elems;
  957. struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
  958. u32 changed = 0;
  959. int i, j, err;
  960. bool have_higher_than_11mbit = false;
  961. u16 ap_ht_cap_flags;
  962. /* AssocResp and ReassocResp have identical structure */
  963. aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
  964. capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
  965. if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
  966. printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
  967. "set\n", sdata->name, aid);
  968. aid &= ~(BIT(15) | BIT(14));
  969. pos = mgmt->u.assoc_resp.variable;
  970. ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
  971. if (!elems.supp_rates) {
  972. printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
  973. sdata->name);
  974. return false;
  975. }
  976. ifmgd->aid = aid;
  977. sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
  978. if (!sta) {
  979. printk(KERN_DEBUG "%s: failed to alloc STA entry for"
  980. " the AP\n", sdata->name);
  981. return false;
  982. }
  983. set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
  984. WLAN_STA_ASSOC_AP);
  985. if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
  986. set_sta_flags(sta, WLAN_STA_AUTHORIZED);
  987. rates = 0;
  988. basic_rates = 0;
  989. sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
  990. for (i = 0; i < elems.supp_rates_len; i++) {
  991. int rate = (elems.supp_rates[i] & 0x7f) * 5;
  992. bool is_basic = !!(elems.supp_rates[i] & 0x80);
  993. if (rate > 110)
  994. have_higher_than_11mbit = true;
  995. for (j = 0; j < sband->n_bitrates; j++) {
  996. if (sband->bitrates[j].bitrate == rate) {
  997. rates |= BIT(j);
  998. if (is_basic)
  999. basic_rates |= BIT(j);
  1000. break;
  1001. }
  1002. }
  1003. }
  1004. for (i = 0; i < elems.ext_supp_rates_len; i++) {
  1005. int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
  1006. bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
  1007. if (rate > 110)
  1008. have_higher_than_11mbit = true;
  1009. for (j = 0; j < sband->n_bitrates; j++) {
  1010. if (sband->bitrates[j].bitrate == rate) {
  1011. rates |= BIT(j);
  1012. if (is_basic)
  1013. basic_rates |= BIT(j);
  1014. break;
  1015. }
  1016. }
  1017. }
  1018. sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
  1019. sdata->vif.bss_conf.basic_rates = basic_rates;
  1020. /* cf. IEEE 802.11 9.2.12 */
  1021. if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
  1022. have_higher_than_11mbit)
  1023. sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
  1024. else
  1025. sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
  1026. if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
  1027. ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
  1028. elems.ht_cap_elem, &sta->sta.ht_cap);
  1029. ap_ht_cap_flags = sta->sta.ht_cap.cap;
  1030. rate_control_rate_init(sta);
  1031. if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
  1032. set_sta_flags(sta, WLAN_STA_MFP);
  1033. if (elems.wmm_param)
  1034. set_sta_flags(sta, WLAN_STA_WME);
  1035. err = sta_info_insert(sta);
  1036. sta = NULL;
  1037. if (err) {
  1038. printk(KERN_DEBUG "%s: failed to insert STA entry for"
  1039. " the AP (error %d)\n", sdata->name, err);
  1040. return false;
  1041. }
  1042. if (elems.wmm_param)
  1043. ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
  1044. elems.wmm_param_len);
  1045. else
  1046. ieee80211_set_wmm_default(sdata);
  1047. local->oper_channel = wk->chan;
  1048. if (elems.ht_info_elem && elems.wmm_param &&
  1049. (sdata->local->hw.queues >= 4) &&
  1050. !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
  1051. changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
  1052. cbss->bssid, ap_ht_cap_flags);
  1053. /* set AID and assoc capability,
  1054. * ieee80211_set_associated() will tell the driver */
  1055. bss_conf->aid = aid;
  1056. bss_conf->assoc_capability = capab_info;
  1057. ieee80211_set_associated(sdata, cbss, changed);
  1058. /*
  1059. * If we're using 4-addr mode, let the AP know that we're
  1060. * doing so, so that it can create the STA VLAN on its side
  1061. */
  1062. if (ifmgd->use_4addr)
  1063. ieee80211_send_4addr_nullfunc(local, sdata);
  1064. /*
  1065. * Start timer to probe the connection to the AP now.
  1066. * Also start the timer that will detect beacon loss.
  1067. */
  1068. ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
  1069. mod_beacon_timer(sdata);
  1070. return true;
  1071. }
  1072. static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
  1073. struct ieee80211_mgmt *mgmt,
  1074. size_t len,
  1075. struct ieee80211_rx_status *rx_status,
  1076. struct ieee802_11_elems *elems,
  1077. bool beacon)
  1078. {
  1079. struct ieee80211_local *local = sdata->local;
  1080. int freq;
  1081. struct ieee80211_bss *bss;
  1082. struct ieee80211_channel *channel;
  1083. bool need_ps = false;
  1084. if (sdata->u.mgd.associated) {
  1085. bss = (void *)sdata->u.mgd.associated->priv;
  1086. /* not previously set so we may need to recalc */
  1087. need_ps = !bss->dtim_period;
  1088. }
  1089. if (elems->ds_params && elems->ds_params_len == 1)
  1090. freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
  1091. else
  1092. freq = rx_status->freq;
  1093. channel = ieee80211_get_channel(local->hw.wiphy, freq);
  1094. if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
  1095. return;
  1096. bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
  1097. channel, beacon);
  1098. if (bss)
  1099. ieee80211_rx_bss_put(local, bss);
  1100. if (!sdata->u.mgd.associated)
  1101. return;
  1102. if (need_ps) {
  1103. mutex_lock(&local->iflist_mtx);
  1104. ieee80211_recalc_ps(local, -1);
  1105. mutex_unlock(&local->iflist_mtx);
  1106. }
  1107. if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
  1108. (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
  1109. ETH_ALEN) == 0)) {
  1110. struct ieee80211_channel_sw_ie *sw_elem =
  1111. (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
  1112. ieee80211_sta_process_chanswitch(sdata, sw_elem,
  1113. bss, rx_status->mactime);
  1114. }
  1115. }
  1116. static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
  1117. struct sk_buff *skb)
  1118. {
  1119. struct ieee80211_mgmt *mgmt = (void *)skb->data;
  1120. struct ieee80211_if_managed *ifmgd;
  1121. struct ieee80211_rx_status *rx_status = (void *) skb->cb;
  1122. size_t baselen, len = skb->len;
  1123. struct ieee802_11_elems elems;
  1124. ifmgd = &sdata->u.mgd;
  1125. ASSERT_MGD_MTX(ifmgd);
  1126. if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
  1127. return; /* ignore ProbeResp to foreign address */
  1128. baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
  1129. if (baselen > len)
  1130. return;
  1131. ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
  1132. &elems);
  1133. ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
  1134. if (ifmgd->associated &&
  1135. memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
  1136. ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
  1137. IEEE80211_STA_CONNECTION_POLL)) {
  1138. ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
  1139. IEEE80211_STA_BEACON_POLL);
  1140. mutex_lock(&sdata->local->iflist_mtx);
  1141. ieee80211_recalc_ps(sdata->local, -1);
  1142. mutex_unlock(&sdata->local->iflist_mtx);
  1143. if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
  1144. return;
  1145. /*
  1146. * We've received a probe response, but are not sure whether
  1147. * we have or will be receiving any beacons or data, so let's
  1148. * schedule the timers again, just in case.
  1149. */
  1150. mod_beacon_timer(sdata);
  1151. mod_timer(&ifmgd->conn_mon_timer,
  1152. round_jiffies_up(jiffies +
  1153. IEEE80211_CONNECTION_IDLE_TIME));
  1154. }
  1155. }
  1156. /*
  1157. * This is the canonical list of information elements we care about,
  1158. * the filter code also gives us all changes to the Microsoft OUI
  1159. * (00:50:F2) vendor IE which is used for WMM which we need to track.
  1160. *
  1161. * We implement beacon filtering in software since that means we can
  1162. * avoid processing the frame here and in cfg80211, and userspace
  1163. * will not be able to tell whether the hardware supports it or not.
  1164. *
  1165. * XXX: This list needs to be dynamic -- userspace needs to be able to
  1166. * add items it requires. It also needs to be able to tell us to
  1167. * look out for other vendor IEs.
  1168. */
  1169. static const u64 care_about_ies =
  1170. (1ULL << WLAN_EID_COUNTRY) |
  1171. (1ULL << WLAN_EID_ERP_INFO) |
  1172. (1ULL << WLAN_EID_CHANNEL_SWITCH) |
  1173. (1ULL << WLAN_EID_PWR_CONSTRAINT) |
  1174. (1ULL << WLAN_EID_HT_CAPABILITY) |
  1175. (1ULL << WLAN_EID_HT_INFORMATION);
  1176. static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
  1177. struct ieee80211_mgmt *mgmt,
  1178. size_t len,
  1179. struct ieee80211_rx_status *rx_status)
  1180. {
  1181. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1182. struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
  1183. size_t baselen;
  1184. struct ieee802_11_elems elems;
  1185. struct ieee80211_local *local = sdata->local;
  1186. u32 changed = 0;
  1187. bool erp_valid, directed_tim = false;
  1188. u8 erp_value = 0;
  1189. u32 ncrc;
  1190. u8 *bssid;
  1191. ASSERT_MGD_MTX(ifmgd);
  1192. /* Process beacon from the current BSS */
  1193. baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
  1194. if (baselen > len)
  1195. return;
  1196. if (rx_status->freq != local->hw.conf.channel->center_freq)
  1197. return;
  1198. /*
  1199. * We might have received a number of frames, among them a
  1200. * disassoc frame and a beacon...
  1201. */
  1202. if (!ifmgd->associated)
  1203. return;
  1204. bssid = ifmgd->associated->bssid;
  1205. /*
  1206. * And in theory even frames from a different AP we were just
  1207. * associated to a split-second ago!
  1208. */
  1209. if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
  1210. return;
  1211. /* Track average RSSI from the Beacon frames of the current AP */
  1212. ifmgd->last_beacon_signal = rx_status->signal;
  1213. if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
  1214. ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
  1215. ifmgd->ave_beacon_signal = rx_status->signal;
  1216. ifmgd->last_cqm_event_signal = 0;
  1217. } else {
  1218. ifmgd->ave_beacon_signal =
  1219. (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
  1220. (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
  1221. ifmgd->ave_beacon_signal) / 16;
  1222. }
  1223. if (bss_conf->cqm_rssi_thold &&
  1224. !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
  1225. int sig = ifmgd->ave_beacon_signal / 16;
  1226. int last_event = ifmgd->last_cqm_event_signal;
  1227. int thold = bss_conf->cqm_rssi_thold;
  1228. int hyst = bss_conf->cqm_rssi_hyst;
  1229. if (sig < thold &&
  1230. (last_event == 0 || sig < last_event - hyst)) {
  1231. ifmgd->last_cqm_event_signal = sig;
  1232. ieee80211_cqm_rssi_notify(
  1233. &sdata->vif,
  1234. NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
  1235. GFP_KERNEL);
  1236. } else if (sig > thold &&
  1237. (last_event == 0 || sig > last_event + hyst)) {
  1238. ifmgd->last_cqm_event_signal = sig;
  1239. ieee80211_cqm_rssi_notify(
  1240. &sdata->vif,
  1241. NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
  1242. GFP_KERNEL);
  1243. }
  1244. }
  1245. if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
  1246. #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  1247. if (net_ratelimit()) {
  1248. printk(KERN_DEBUG "%s: cancelling probereq poll due "
  1249. "to a received beacon\n", sdata->name);
  1250. }
  1251. #endif
  1252. ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
  1253. mutex_lock(&local->iflist_mtx);
  1254. ieee80211_recalc_ps(local, -1);
  1255. mutex_unlock(&local->iflist_mtx);
  1256. }
  1257. /*
  1258. * Push the beacon loss detection into the future since
  1259. * we are processing a beacon from the AP just now.
  1260. */
  1261. mod_beacon_timer(sdata);
  1262. ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
  1263. ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
  1264. len - baselen, &elems,
  1265. care_about_ies, ncrc);
  1266. if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
  1267. directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
  1268. ifmgd->aid);
  1269. if (ncrc != ifmgd->beacon_crc) {
  1270. ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
  1271. true);
  1272. ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
  1273. elems.wmm_param_len);
  1274. }
  1275. if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
  1276. if (directed_tim) {
  1277. if (local->hw.conf.dynamic_ps_timeout > 0) {
  1278. local->hw.conf.flags &= ~IEEE80211_CONF_PS;
  1279. ieee80211_hw_config(local,
  1280. IEEE80211_CONF_CHANGE_PS);
  1281. ieee80211_send_nullfunc(local, sdata, 0);
  1282. } else {
  1283. local->pspolling = true;
  1284. /*
  1285. * Here is assumed that the driver will be
  1286. * able to send ps-poll frame and receive a
  1287. * response even though power save mode is
  1288. * enabled, but some drivers might require
  1289. * to disable power save here. This needs
  1290. * to be investigated.
  1291. */
  1292. ieee80211_send_pspoll(local, sdata);
  1293. }
  1294. }
  1295. }
  1296. if (ncrc == ifmgd->beacon_crc)
  1297. return;
  1298. ifmgd->beacon_crc = ncrc;
  1299. if (elems.erp_info && elems.erp_info_len >= 1) {
  1300. erp_valid = true;
  1301. erp_value = elems.erp_info[0];
  1302. } else {
  1303. erp_valid = false;
  1304. }
  1305. changed |= ieee80211_handle_bss_capability(sdata,
  1306. le16_to_cpu(mgmt->u.beacon.capab_info),
  1307. erp_valid, erp_value);
  1308. if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
  1309. !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
  1310. struct sta_info *sta;
  1311. struct ieee80211_supported_band *sband;
  1312. u16 ap_ht_cap_flags;
  1313. rcu_read_lock();
  1314. sta = sta_info_get(sdata, bssid);
  1315. if (WARN_ON(!sta)) {
  1316. rcu_read_unlock();
  1317. return;
  1318. }
  1319. sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
  1320. ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
  1321. elems.ht_cap_elem, &sta->sta.ht_cap);
  1322. ap_ht_cap_flags = sta->sta.ht_cap.cap;
  1323. rcu_read_unlock();
  1324. changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
  1325. bssid, ap_ht_cap_flags);
  1326. }
  1327. /* Note: country IE parsing is done for us by cfg80211 */
  1328. if (elems.country_elem) {
  1329. /* TODO: IBSS also needs this */
  1330. if (elems.pwr_constr_elem)
  1331. ieee80211_handle_pwr_constr(sdata,
  1332. le16_to_cpu(mgmt->u.probe_resp.capab_info),
  1333. elems.pwr_constr_elem,
  1334. elems.pwr_constr_elem_len);
  1335. }
  1336. ieee80211_bss_info_change_notify(sdata, changed);
  1337. }
  1338. ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
  1339. struct sk_buff *skb)
  1340. {
  1341. struct ieee80211_local *local = sdata->local;
  1342. struct ieee80211_mgmt *mgmt;
  1343. u16 fc;
  1344. if (skb->len < 24)
  1345. return RX_DROP_MONITOR;
  1346. mgmt = (struct ieee80211_mgmt *) skb->data;
  1347. fc = le16_to_cpu(mgmt->frame_control);
  1348. switch (fc & IEEE80211_FCTL_STYPE) {
  1349. case IEEE80211_STYPE_PROBE_RESP:
  1350. case IEEE80211_STYPE_BEACON:
  1351. case IEEE80211_STYPE_DEAUTH:
  1352. case IEEE80211_STYPE_DISASSOC:
  1353. case IEEE80211_STYPE_ACTION:
  1354. skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
  1355. ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
  1356. return RX_QUEUED;
  1357. }
  1358. return RX_DROP_MONITOR;
  1359. }
  1360. static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
  1361. struct sk_buff *skb)
  1362. {
  1363. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1364. struct ieee80211_rx_status *rx_status;
  1365. struct ieee80211_mgmt *mgmt;
  1366. enum rx_mgmt_action rma = RX_MGMT_NONE;
  1367. u16 fc;
  1368. rx_status = (struct ieee80211_rx_status *) skb->cb;
  1369. mgmt = (struct ieee80211_mgmt *) skb->data;
  1370. fc = le16_to_cpu(mgmt->frame_control);
  1371. mutex_lock(&ifmgd->mtx);
  1372. if (ifmgd->associated &&
  1373. memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
  1374. switch (fc & IEEE80211_FCTL_STYPE) {
  1375. case IEEE80211_STYPE_BEACON:
  1376. ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
  1377. rx_status);
  1378. break;
  1379. case IEEE80211_STYPE_PROBE_RESP:
  1380. ieee80211_rx_mgmt_probe_resp(sdata, skb);
  1381. break;
  1382. case IEEE80211_STYPE_DEAUTH:
  1383. rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
  1384. break;
  1385. case IEEE80211_STYPE_DISASSOC:
  1386. rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
  1387. break;
  1388. case IEEE80211_STYPE_ACTION:
  1389. if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
  1390. break;
  1391. ieee80211_sta_process_chanswitch(sdata,
  1392. &mgmt->u.action.u.chan_switch.sw_elem,
  1393. (void *)ifmgd->associated->priv,
  1394. rx_status->mactime);
  1395. break;
  1396. }
  1397. mutex_unlock(&ifmgd->mtx);
  1398. switch (rma) {
  1399. case RX_MGMT_NONE:
  1400. /* no action */
  1401. break;
  1402. case RX_MGMT_CFG80211_DEAUTH:
  1403. cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
  1404. break;
  1405. case RX_MGMT_CFG80211_DISASSOC:
  1406. cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
  1407. break;
  1408. default:
  1409. WARN(1, "unexpected: %d", rma);
  1410. }
  1411. goto out;
  1412. }
  1413. mutex_unlock(&ifmgd->mtx);
  1414. if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
  1415. (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
  1416. cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
  1417. out:
  1418. kfree_skb(skb);
  1419. }
  1420. static void ieee80211_sta_timer(unsigned long data)
  1421. {
  1422. struct ieee80211_sub_if_data *sdata =
  1423. (struct ieee80211_sub_if_data *) data;
  1424. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1425. struct ieee80211_local *local = sdata->local;
  1426. if (local->quiescing) {
  1427. set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
  1428. return;
  1429. }
  1430. ieee80211_queue_work(&local->hw, &ifmgd->work);
  1431. }
  1432. static void ieee80211_sta_work(struct work_struct *work)
  1433. {
  1434. struct ieee80211_sub_if_data *sdata =
  1435. container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
  1436. struct ieee80211_local *local = sdata->local;
  1437. struct ieee80211_if_managed *ifmgd;
  1438. struct sk_buff *skb;
  1439. if (!ieee80211_sdata_running(sdata))
  1440. return;
  1441. if (local->scanning)
  1442. return;
  1443. if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
  1444. return;
  1445. /*
  1446. * ieee80211_queue_work() should have picked up most cases,
  1447. * here we'll pick the the rest.
  1448. */
  1449. if (WARN(local->suspended, "STA MLME work scheduled while "
  1450. "going to suspend\n"))
  1451. return;
  1452. ifmgd = &sdata->u.mgd;
  1453. /* first process frames to avoid timing out while a frame is pending */
  1454. while ((skb = skb_dequeue(&ifmgd->skb_queue)))
  1455. ieee80211_sta_rx_queued_mgmt(sdata, skb);
  1456. /* then process the rest of the work */
  1457. mutex_lock(&ifmgd->mtx);
  1458. if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
  1459. IEEE80211_STA_CONNECTION_POLL) &&
  1460. ifmgd->associated) {
  1461. u8 bssid[ETH_ALEN];
  1462. memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
  1463. if (time_is_after_jiffies(ifmgd->probe_timeout))
  1464. run_again(ifmgd, ifmgd->probe_timeout);
  1465. else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
  1466. #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  1467. printk(KERN_DEBUG "No probe response from AP %pM"
  1468. " after %dms, try %d\n", bssid,
  1469. (1000 * IEEE80211_PROBE_WAIT)/HZ,
  1470. ifmgd->probe_send_count);
  1471. #endif
  1472. ieee80211_mgd_probe_ap_send(sdata);
  1473. } else {
  1474. /*
  1475. * We actually lost the connection ... or did we?
  1476. * Let's make sure!
  1477. */
  1478. ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
  1479. IEEE80211_STA_BEACON_POLL);
  1480. printk(KERN_DEBUG "No probe response from AP %pM"
  1481. " after %dms, disconnecting.\n",
  1482. bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
  1483. ieee80211_set_disassoc(sdata, true);
  1484. ieee80211_recalc_idle(local);
  1485. mutex_unlock(&ifmgd->mtx);
  1486. /*
  1487. * must be outside lock due to cfg80211,
  1488. * but that's not a problem.
  1489. */
  1490. ieee80211_send_deauth_disassoc(sdata, bssid,
  1491. IEEE80211_STYPE_DEAUTH,
  1492. WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
  1493. NULL, true);
  1494. mutex_lock(&ifmgd->mtx);
  1495. }
  1496. }
  1497. mutex_unlock(&ifmgd->mtx);
  1498. }
  1499. static void ieee80211_sta_bcn_mon_timer(unsigned long data)
  1500. {
  1501. struct ieee80211_sub_if_data *sdata =
  1502. (struct ieee80211_sub_if_data *) data;
  1503. struct ieee80211_local *local = sdata->local;
  1504. if (local->quiescing)
  1505. return;
  1506. ieee80211_queue_work(&sdata->local->hw,
  1507. &sdata->u.mgd.beacon_connection_loss_work);
  1508. }
  1509. static void ieee80211_sta_conn_mon_timer(unsigned long data)
  1510. {
  1511. struct ieee80211_sub_if_data *sdata =
  1512. (struct ieee80211_sub_if_data *) data;
  1513. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1514. struct ieee80211_local *local = sdata->local;
  1515. if (local->quiescing)
  1516. return;
  1517. ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
  1518. }
  1519. static void ieee80211_sta_monitor_work(struct work_struct *work)
  1520. {
  1521. struct ieee80211_sub_if_data *sdata =
  1522. container_of(work, struct ieee80211_sub_if_data,
  1523. u.mgd.monitor_work);
  1524. ieee80211_mgd_probe_ap(sdata, false);
  1525. }
  1526. static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
  1527. {
  1528. if (sdata->vif.type == NL80211_IFTYPE_STATION) {
  1529. sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
  1530. IEEE80211_STA_CONNECTION_POLL);
  1531. /* let's probe the connection once */
  1532. ieee80211_queue_work(&sdata->local->hw,
  1533. &sdata->u.mgd.monitor_work);
  1534. /* and do all the other regular work too */
  1535. ieee80211_queue_work(&sdata->local->hw,
  1536. &sdata->u.mgd.work);
  1537. }
  1538. }
  1539. #ifdef CONFIG_PM
  1540. void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
  1541. {
  1542. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1543. /*
  1544. * we need to use atomic bitops for the running bits
  1545. * only because both timers might fire at the same
  1546. * time -- the code here is properly synchronised.
  1547. */
  1548. cancel_work_sync(&ifmgd->work);
  1549. cancel_work_sync(&ifmgd->beacon_connection_loss_work);
  1550. if (del_timer_sync(&ifmgd->timer))
  1551. set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
  1552. cancel_work_sync(&ifmgd->chswitch_work);
  1553. if (del_timer_sync(&ifmgd->chswitch_timer))
  1554. set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
  1555. cancel_work_sync(&ifmgd->monitor_work);
  1556. /* these will just be re-established on connection */
  1557. del_timer_sync(&ifmgd->conn_mon_timer);
  1558. del_timer_sync(&ifmgd->bcn_mon_timer);
  1559. }
  1560. void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
  1561. {
  1562. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1563. if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
  1564. add_timer(&ifmgd->timer);
  1565. if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
  1566. add_timer(&ifmgd->chswitch_timer);
  1567. }
  1568. #endif
  1569. /* interface setup */
  1570. void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
  1571. {
  1572. struct ieee80211_if_managed *ifmgd;
  1573. ifmgd = &sdata->u.mgd;
  1574. INIT_WORK(&ifmgd->work, ieee80211_sta_work);
  1575. INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
  1576. INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
  1577. INIT_WORK(&ifmgd->beacon_connection_loss_work,
  1578. ieee80211_beacon_connection_loss_work);
  1579. setup_timer(&ifmgd->timer, ieee80211_sta_timer,
  1580. (unsigned long) sdata);
  1581. setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
  1582. (unsigned long) sdata);
  1583. setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
  1584. (unsigned long) sdata);
  1585. setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
  1586. (unsigned long) sdata);
  1587. skb_queue_head_init(&ifmgd->skb_queue);
  1588. ifmgd->flags = 0;
  1589. mutex_init(&ifmgd->mtx);
  1590. if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
  1591. ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
  1592. else
  1593. ifmgd->req_smps = IEEE80211_SMPS_OFF;
  1594. }
  1595. /* scan finished notification */
  1596. void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
  1597. {
  1598. struct ieee80211_sub_if_data *sdata = local->scan_sdata;
  1599. /* Restart STA timers */
  1600. rcu_read_lock();
  1601. list_for_each_entry_rcu(sdata, &local->interfaces, list)
  1602. ieee80211_restart_sta_timer(sdata);
  1603. rcu_read_unlock();
  1604. }
  1605. int ieee80211_max_network_latency(struct notifier_block *nb,
  1606. unsigned long data, void *dummy)
  1607. {
  1608. s32 latency_usec = (s32) data;
  1609. struct ieee80211_local *local =
  1610. container_of(nb, struct ieee80211_local,
  1611. network_latency_notifier);
  1612. mutex_lock(&local->iflist_mtx);
  1613. ieee80211_recalc_ps(local, latency_usec);
  1614. mutex_unlock(&local->iflist_mtx);
  1615. return 0;
  1616. }
  1617. /* config hooks */
  1618. static enum work_done_result
  1619. ieee80211_probe_auth_done(struct ieee80211_work *wk,
  1620. struct sk_buff *skb)
  1621. {
  1622. if (!skb) {
  1623. cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
  1624. return WORK_DONE_DESTROY;
  1625. }
  1626. if (wk->type == IEEE80211_WORK_AUTH) {
  1627. cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
  1628. return WORK_DONE_DESTROY;
  1629. }
  1630. mutex_lock(&wk->sdata->u.mgd.mtx);
  1631. ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
  1632. mutex_unlock(&wk->sdata->u.mgd.mtx);
  1633. wk->type = IEEE80211_WORK_AUTH;
  1634. wk->probe_auth.tries = 0;
  1635. return WORK_DONE_REQUEUE;
  1636. }
  1637. int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
  1638. struct cfg80211_auth_request *req)
  1639. {
  1640. const u8 *ssid;
  1641. struct ieee80211_work *wk;
  1642. u16 auth_alg;
  1643. if (req->local_state_change)
  1644. return 0; /* no need to update mac80211 state */
  1645. switch (req->auth_type) {
  1646. case NL80211_AUTHTYPE_OPEN_SYSTEM:
  1647. auth_alg = WLAN_AUTH_OPEN;
  1648. break;
  1649. case NL80211_AUTHTYPE_SHARED_KEY:
  1650. auth_alg = WLAN_AUTH_SHARED_KEY;
  1651. break;
  1652. case NL80211_AUTHTYPE_FT:
  1653. auth_alg = WLAN_AUTH_FT;
  1654. break;
  1655. case NL80211_AUTHTYPE_NETWORK_EAP:
  1656. auth_alg = WLAN_AUTH_LEAP;
  1657. break;
  1658. default:
  1659. return -EOPNOTSUPP;
  1660. }
  1661. wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
  1662. if (!wk)
  1663. return -ENOMEM;
  1664. memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
  1665. if (req->ie && req->ie_len) {
  1666. memcpy(wk->ie, req->ie, req->ie_len);
  1667. wk->ie_len = req->ie_len;
  1668. }
  1669. if (req->key && req->key_len) {
  1670. wk->probe_auth.key_len = req->key_len;
  1671. wk->probe_auth.key_idx = req->key_idx;
  1672. memcpy(wk->probe_auth.key, req->key, req->key_len);
  1673. }
  1674. ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
  1675. memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
  1676. wk->probe_auth.ssid_len = ssid[1];
  1677. wk->probe_auth.algorithm = auth_alg;
  1678. wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
  1679. /* if we already have a probe, don't probe again */
  1680. if (req->bss->proberesp_ies)
  1681. wk->type = IEEE80211_WORK_AUTH;
  1682. else
  1683. wk->type = IEEE80211_WORK_DIRECT_PROBE;
  1684. wk->chan = req->bss->channel;
  1685. wk->sdata = sdata;
  1686. wk->done = ieee80211_probe_auth_done;
  1687. ieee80211_add_work(wk);
  1688. return 0;
  1689. }
  1690. static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
  1691. struct sk_buff *skb)
  1692. {
  1693. struct ieee80211_mgmt *mgmt;
  1694. u16 status;
  1695. if (!skb) {
  1696. cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
  1697. return WORK_DONE_DESTROY;
  1698. }
  1699. mgmt = (void *)skb->data;
  1700. status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
  1701. if (status == WLAN_STATUS_SUCCESS) {
  1702. mutex_lock(&wk->sdata->u.mgd.mtx);
  1703. if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
  1704. mutex_unlock(&wk->sdata->u.mgd.mtx);
  1705. /* oops -- internal error -- send timeout for now */
  1706. cfg80211_send_assoc_timeout(wk->sdata->dev,
  1707. wk->filter_ta);
  1708. return WORK_DONE_DESTROY;
  1709. }
  1710. mutex_unlock(&wk->sdata->u.mgd.mtx);
  1711. }
  1712. cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
  1713. return WORK_DONE_DESTROY;
  1714. }
  1715. int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
  1716. struct cfg80211_assoc_request *req)
  1717. {
  1718. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1719. struct ieee80211_bss *bss = (void *)req->bss->priv;
  1720. struct ieee80211_work *wk;
  1721. const u8 *ssid;
  1722. int i;
  1723. mutex_lock(&ifmgd->mtx);
  1724. if (ifmgd->associated) {
  1725. if (!req->prev_bssid ||
  1726. memcmp(req->prev_bssid, ifmgd->associated->bssid,
  1727. ETH_ALEN)) {
  1728. /*
  1729. * We are already associated and the request was not a
  1730. * reassociation request from the current BSS, so
  1731. * reject it.
  1732. */
  1733. mutex_unlock(&ifmgd->mtx);
  1734. return -EALREADY;
  1735. }
  1736. /* Trying to reassociate - clear previous association state */
  1737. ieee80211_set_disassoc(sdata, true);
  1738. }
  1739. mutex_unlock(&ifmgd->mtx);
  1740. wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
  1741. if (!wk)
  1742. return -ENOMEM;
  1743. ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
  1744. ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
  1745. for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
  1746. if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
  1747. req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
  1748. req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
  1749. ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
  1750. if (req->ie && req->ie_len) {
  1751. memcpy(wk->ie, req->ie, req->ie_len);
  1752. wk->ie_len = req->ie_len;
  1753. } else
  1754. wk->ie_len = 0;
  1755. wk->assoc.bss = req->bss;
  1756. memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
  1757. /* new association always uses requested smps mode */
  1758. if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
  1759. if (ifmgd->powersave)
  1760. ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
  1761. else
  1762. ifmgd->ap_smps = IEEE80211_SMPS_OFF;
  1763. } else
  1764. ifmgd->ap_smps = ifmgd->req_smps;
  1765. wk->assoc.smps = ifmgd->ap_smps;
  1766. /*
  1767. * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
  1768. * We still associate in non-HT mode (11a/b/g) if any one of these
  1769. * ciphers is configured as pairwise.
  1770. * We can set this to true for non-11n hardware, that'll be checked
  1771. * separately along with the peer capabilities.
  1772. */
  1773. wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
  1774. wk->assoc.capability = req->bss->capability;
  1775. wk->assoc.wmm_used = bss->wmm_used;
  1776. wk->assoc.supp_rates = bss->supp_rates;
  1777. wk->assoc.supp_rates_len = bss->supp_rates_len;
  1778. wk->assoc.ht_information_ie =
  1779. ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
  1780. if (bss->wmm_used && bss->uapsd_supported &&
  1781. (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
  1782. wk->assoc.uapsd_used = true;
  1783. ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
  1784. } else {
  1785. wk->assoc.uapsd_used = false;
  1786. ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
  1787. }
  1788. ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
  1789. memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
  1790. wk->assoc.ssid_len = ssid[1];
  1791. if (req->prev_bssid)
  1792. memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
  1793. wk->type = IEEE80211_WORK_ASSOC;
  1794. wk->chan = req->bss->channel;
  1795. wk->sdata = sdata;
  1796. wk->done = ieee80211_assoc_done;
  1797. if (req->use_mfp) {
  1798. ifmgd->mfp = IEEE80211_MFP_REQUIRED;
  1799. ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
  1800. } else {
  1801. ifmgd->mfp = IEEE80211_MFP_DISABLED;
  1802. ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
  1803. }
  1804. if (req->crypto.control_port)
  1805. ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
  1806. else
  1807. ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
  1808. ieee80211_add_work(wk);
  1809. return 0;
  1810. }
  1811. int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
  1812. struct cfg80211_deauth_request *req,
  1813. void *cookie)
  1814. {
  1815. struct ieee80211_local *local = sdata->local;
  1816. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1817. struct ieee80211_work *wk;
  1818. const u8 *bssid = req->bss->bssid;
  1819. mutex_lock(&ifmgd->mtx);
  1820. if (ifmgd->associated == req->bss) {
  1821. bssid = req->bss->bssid;
  1822. ieee80211_set_disassoc(sdata, true);
  1823. mutex_unlock(&ifmgd->mtx);
  1824. } else {
  1825. bool not_auth_yet = false;
  1826. mutex_unlock(&ifmgd->mtx);
  1827. mutex_lock(&local->work_mtx);
  1828. list_for_each_entry(wk, &local->work_list, list) {
  1829. if (wk->sdata != sdata)
  1830. continue;
  1831. if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
  1832. wk->type != IEEE80211_WORK_AUTH &&
  1833. wk->type != IEEE80211_WORK_ASSOC)
  1834. continue;
  1835. if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
  1836. continue;
  1837. not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
  1838. list_del_rcu(&wk->list);
  1839. free_work(wk);
  1840. break;
  1841. }
  1842. mutex_unlock(&local->work_mtx);
  1843. /*
  1844. * If somebody requests authentication and we haven't
  1845. * sent out an auth frame yet there's no need to send
  1846. * out a deauth frame either. If the state was PROBE,
  1847. * then this is the case. If it's AUTH we have sent a
  1848. * frame, and if it's IDLE we have completed the auth
  1849. * process already.
  1850. */
  1851. if (not_auth_yet) {
  1852. __cfg80211_auth_canceled(sdata->dev, bssid);
  1853. return 0;
  1854. }
  1855. }
  1856. printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
  1857. sdata->name, bssid, req->reason_code);
  1858. ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
  1859. req->reason_code, cookie,
  1860. !req->local_state_change);
  1861. ieee80211_recalc_idle(sdata->local);
  1862. return 0;
  1863. }
  1864. int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
  1865. struct cfg80211_disassoc_request *req,
  1866. void *cookie)
  1867. {
  1868. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1869. u8 bssid[ETH_ALEN];
  1870. mutex_lock(&ifmgd->mtx);
  1871. /*
  1872. * cfg80211 should catch this ... but it's racy since
  1873. * we can receive a disassoc frame, process it, hand it
  1874. * to cfg80211 while that's in a locked section already
  1875. * trying to tell us that the user wants to disconnect.
  1876. */
  1877. if (ifmgd->associated != req->bss) {
  1878. mutex_unlock(&ifmgd->mtx);
  1879. return -ENOLINK;
  1880. }
  1881. printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
  1882. sdata->name, req->bss->bssid, req->reason_code);
  1883. memcpy(bssid, req->bss->bssid, ETH_ALEN);
  1884. ieee80211_set_disassoc(sdata, false);
  1885. mutex_unlock(&ifmgd->mtx);
  1886. ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
  1887. IEEE80211_STYPE_DISASSOC, req->reason_code,
  1888. cookie, !req->local_state_change);
  1889. sta_info_destroy_addr(sdata, bssid);
  1890. ieee80211_recalc_idle(sdata->local);
  1891. return 0;
  1892. }
  1893. int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
  1894. struct ieee80211_channel *chan,
  1895. enum nl80211_channel_type channel_type,
  1896. const u8 *buf, size_t len, u64 *cookie)
  1897. {
  1898. struct ieee80211_local *local = sdata->local;
  1899. struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  1900. struct sk_buff *skb;
  1901. /* Check that we are on the requested channel for transmission */
  1902. if ((chan != local->tmp_channel ||
  1903. channel_type != local->tmp_channel_type) &&
  1904. (chan != local->oper_channel ||
  1905. channel_type != local->_oper_channel_type))
  1906. return -EBUSY;
  1907. skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
  1908. if (!skb)
  1909. return -ENOMEM;
  1910. skb_reserve(skb, local->hw.extra_tx_headroom);
  1911. memcpy(skb_put(skb, len), buf, len);
  1912. if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
  1913. IEEE80211_SKB_CB(skb)->flags |=
  1914. IEEE80211_TX_INTFL_DONT_ENCRYPT;
  1915. IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
  1916. IEEE80211_TX_CTL_REQ_TX_STATUS;
  1917. skb->dev = sdata->dev;
  1918. ieee80211_tx_skb(sdata, skb);
  1919. *cookie = (unsigned long) skb;
  1920. return 0;
  1921. }
  1922. void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
  1923. enum nl80211_cqm_rssi_threshold_event rssi_event,
  1924. gfp_t gfp)
  1925. {
  1926. struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
  1927. trace_api_cqm_rssi_notify(sdata, rssi_event);
  1928. cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
  1929. }
  1930. EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);