1 /*
2  * Marvell Wireless LAN device driver: station event handling
3  *
4  * Copyright (C) 2011-2014, Marvell International Ltd.
5  *
6  * This software file (the "File") is distributed by Marvell International
7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8  * (the "License").  You may use, redistribute and/or modify this File in
9  * accordance with the terms and conditions of the License, a copy of which
10  * is available by writing to the Free Software Foundation, Inc.,
11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13  *
14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
17  * this warranty disclaimer.
18  */
19 
20 #include "decl.h"
21 #include "ioctl.h"
22 #include "util.h"
23 #include "fw.h"
24 #include "main.h"
25 #include "wmm.h"
26 #include "11n.h"
27 
28 /*
29  * This function resets the connection state.
30  *
31  * The function is invoked after receiving a disconnect event from firmware,
32  * and performs the following actions -
33  *      - Set media status to disconnected
34  *      - Clean up Tx and Rx packets
35  *      - Resets SNR/NF/RSSI value in driver
36  *      - Resets security configurations in driver
37  *      - Enables auto data rate
38  *      - Saves the previous SSID and BSSID so that they can
39  *        be used for re-association, if required
40  *      - Erases current SSID and BSSID information
41  *      - Sends a disconnect event to upper layers/applications.
42  */
43 void
mwifiex_reset_connect_state(struct mwifiex_private * priv,u16 reason_code)44 mwifiex_reset_connect_state(struct mwifiex_private *priv, u16 reason_code)
45 {
46 	struct mwifiex_adapter *adapter = priv->adapter;
47 
48 	if (!priv->media_connected)
49 		return;
50 
51 	dev_dbg(adapter->dev, "info: handles disconnect event\n");
52 
53 	priv->media_connected = false;
54 
55 	priv->scan_block = false;
56 
57 	if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
58 	    ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info)) {
59 		mwifiex_disable_all_tdls_links(priv);
60 
61 		if (priv->adapter->auto_tdls)
62 			mwifiex_clean_auto_tdls(priv);
63 	}
64 
65 	/* Free Tx and Rx packets, report disconnect to upper layer */
66 	mwifiex_clean_txrx(priv);
67 
68 	/* Reset SNR/NF/RSSI values */
69 	priv->data_rssi_last = 0;
70 	priv->data_nf_last = 0;
71 	priv->data_rssi_avg = 0;
72 	priv->data_nf_avg = 0;
73 	priv->bcn_rssi_last = 0;
74 	priv->bcn_nf_last = 0;
75 	priv->bcn_rssi_avg = 0;
76 	priv->bcn_nf_avg = 0;
77 	priv->rxpd_rate = 0;
78 	priv->rxpd_htinfo = 0;
79 	priv->sec_info.wpa_enabled = false;
80 	priv->sec_info.wpa2_enabled = false;
81 	priv->wpa_ie_len = 0;
82 
83 	priv->sec_info.wapi_enabled = false;
84 	priv->wapi_ie_len = 0;
85 	priv->sec_info.wapi_key_on = false;
86 
87 	priv->sec_info.encryption_mode = 0;
88 
89 	/* Enable auto data rate */
90 	priv->is_data_rate_auto = true;
91 	priv->data_rate = 0;
92 
93 	if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA ||
94 	     GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) && priv->hist_data)
95 		mwifiex_hist_data_reset(priv);
96 
97 	if (priv->bss_mode == NL80211_IFTYPE_ADHOC) {
98 		priv->adhoc_state = ADHOC_IDLE;
99 		priv->adhoc_is_link_sensed = false;
100 	}
101 
102 	/*
103 	 * Memorize the previous SSID and BSSID so
104 	 * it could be used for re-assoc
105 	 */
106 
107 	dev_dbg(adapter->dev, "info: previous SSID=%s, SSID len=%u\n",
108 		priv->prev_ssid.ssid, priv->prev_ssid.ssid_len);
109 
110 	dev_dbg(adapter->dev, "info: current SSID=%s, SSID len=%u\n",
111 		priv->curr_bss_params.bss_descriptor.ssid.ssid,
112 		priv->curr_bss_params.bss_descriptor.ssid.ssid_len);
113 
114 	memcpy(&priv->prev_ssid,
115 	       &priv->curr_bss_params.bss_descriptor.ssid,
116 	       sizeof(struct cfg80211_ssid));
117 
118 	memcpy(priv->prev_bssid,
119 	       priv->curr_bss_params.bss_descriptor.mac_address, ETH_ALEN);
120 
121 	/* Need to erase the current SSID and BSSID info */
122 	memset(&priv->curr_bss_params, 0x00, sizeof(priv->curr_bss_params));
123 
124 	adapter->tx_lock_flag = false;
125 	adapter->pps_uapsd_mode = false;
126 
127 	if (adapter->is_cmd_timedout && adapter->curr_cmd)
128 		return;
129 	priv->media_connected = false;
130 	dev_dbg(adapter->dev,
131 		"info: successfully disconnected from %pM: reason code %d\n",
132 		priv->cfg_bssid, reason_code);
133 	if (priv->bss_mode == NL80211_IFTYPE_STATION ||
134 	    priv->bss_mode == NL80211_IFTYPE_P2P_CLIENT) {
135 		cfg80211_disconnected(priv->netdev, reason_code, NULL, 0,
136 				      GFP_KERNEL);
137 	}
138 	eth_zero_addr(priv->cfg_bssid);
139 
140 	mwifiex_stop_net_dev_queue(priv->netdev, adapter);
141 	if (netif_carrier_ok(priv->netdev))
142 		netif_carrier_off(priv->netdev);
143 }
144 
mwifiex_parse_tdls_event(struct mwifiex_private * priv,struct sk_buff * event_skb)145 static int mwifiex_parse_tdls_event(struct mwifiex_private *priv,
146 				    struct sk_buff *event_skb)
147 {
148 	int ret = 0;
149 	struct mwifiex_adapter *adapter = priv->adapter;
150 	struct mwifiex_sta_node *sta_ptr;
151 	struct mwifiex_tdls_generic_event *tdls_evt =
152 			(void *)event_skb->data + sizeof(adapter->event_cause);
153 
154 	/* reserved 2 bytes are not mandatory in tdls event */
155 	if (event_skb->len < (sizeof(struct mwifiex_tdls_generic_event) -
156 			      sizeof(u16) - sizeof(adapter->event_cause))) {
157 		dev_err(adapter->dev, "Invalid event length!\n");
158 		return -1;
159 	}
160 
161 	sta_ptr = mwifiex_get_sta_entry(priv, tdls_evt->peer_mac);
162 	if (!sta_ptr) {
163 		dev_err(adapter->dev, "cannot get sta entry!\n");
164 		return -1;
165 	}
166 
167 	switch (le16_to_cpu(tdls_evt->type)) {
168 	case TDLS_EVENT_LINK_TEAR_DOWN:
169 		cfg80211_tdls_oper_request(priv->netdev,
170 					   tdls_evt->peer_mac,
171 					   NL80211_TDLS_TEARDOWN,
172 					   le16_to_cpu(tdls_evt->u.reason_code),
173 					   GFP_KERNEL);
174 		break;
175 	default:
176 		break;
177 	}
178 
179 	return ret;
180 }
181 
182 /*
183  * This function handles events generated by firmware.
184  *
185  * This is a generic function and handles all events.
186  *
187  * Event specific routines are called by this function based
188  * upon the generated event cause.
189  *
190  * For the following events, the function just forwards them to upper
191  * layers, optionally recording the change -
192  *      - EVENT_LINK_SENSED
193  *      - EVENT_MIC_ERR_UNICAST
194  *      - EVENT_MIC_ERR_MULTICAST
195  *      - EVENT_PORT_RELEASE
196  *      - EVENT_RSSI_LOW
197  *      - EVENT_SNR_LOW
198  *      - EVENT_MAX_FAIL
199  *      - EVENT_RSSI_HIGH
200  *      - EVENT_SNR_HIGH
201  *      - EVENT_DATA_RSSI_LOW
202  *      - EVENT_DATA_SNR_LOW
203  *      - EVENT_DATA_RSSI_HIGH
204  *      - EVENT_DATA_SNR_HIGH
205  *      - EVENT_LINK_QUALITY
206  *      - EVENT_PRE_BEACON_LOST
207  *      - EVENT_IBSS_COALESCED
208  *      - EVENT_WEP_ICV_ERR
209  *      - EVENT_BW_CHANGE
210  *      - EVENT_HOSTWAKE_STAIE
211   *
212  * For the following events, no action is taken -
213  *      - EVENT_MIB_CHANGED
214  *      - EVENT_INIT_DONE
215  *      - EVENT_DUMMY_HOST_WAKEUP_SIGNAL
216  *
217  * Rest of the supported events requires driver handling -
218  *      - EVENT_DEAUTHENTICATED
219  *      - EVENT_DISASSOCIATED
220  *      - EVENT_LINK_LOST
221  *      - EVENT_PS_SLEEP
222  *      - EVENT_PS_AWAKE
223  *      - EVENT_DEEP_SLEEP_AWAKE
224  *      - EVENT_HS_ACT_REQ
225  *      - EVENT_ADHOC_BCN_LOST
226  *      - EVENT_BG_SCAN_REPORT
227  *      - EVENT_WMM_STATUS_CHANGE
228  *      - EVENT_ADDBA
229  *      - EVENT_DELBA
230  *      - EVENT_BA_STREAM_TIEMOUT
231  *      - EVENT_AMSDU_AGGR_CTRL
232  */
mwifiex_process_sta_event(struct mwifiex_private * priv)233 int mwifiex_process_sta_event(struct mwifiex_private *priv)
234 {
235 	struct mwifiex_adapter *adapter = priv->adapter;
236 	int ret = 0;
237 	u32 eventcause = adapter->event_cause;
238 	u16 ctrl, reason_code;
239 
240 	switch (eventcause) {
241 	case EVENT_DUMMY_HOST_WAKEUP_SIGNAL:
242 		dev_err(adapter->dev,
243 			"invalid EVENT: DUMMY_HOST_WAKEUP_SIGNAL, ignore it\n");
244 		break;
245 	case EVENT_LINK_SENSED:
246 		dev_dbg(adapter->dev, "event: LINK_SENSED\n");
247 		if (!netif_carrier_ok(priv->netdev))
248 			netif_carrier_on(priv->netdev);
249 		mwifiex_wake_up_net_dev_queue(priv->netdev, adapter);
250 		break;
251 
252 	case EVENT_DEAUTHENTICATED:
253 		dev_dbg(adapter->dev, "event: Deauthenticated\n");
254 		if (priv->wps.session_enable) {
255 			dev_dbg(adapter->dev,
256 				"info: receive deauth event in wps session\n");
257 			break;
258 		}
259 		adapter->dbg.num_event_deauth++;
260 		if (priv->media_connected) {
261 			reason_code =
262 				le16_to_cpu(*(__le16 *)adapter->event_body);
263 			mwifiex_reset_connect_state(priv, reason_code);
264 		}
265 		break;
266 
267 	case EVENT_DISASSOCIATED:
268 		dev_dbg(adapter->dev, "event: Disassociated\n");
269 		if (priv->wps.session_enable) {
270 			dev_dbg(adapter->dev,
271 				"info: receive disassoc event in wps session\n");
272 			break;
273 		}
274 		adapter->dbg.num_event_disassoc++;
275 		if (priv->media_connected) {
276 			reason_code =
277 				le16_to_cpu(*(__le16 *)adapter->event_body);
278 			mwifiex_reset_connect_state(priv, reason_code);
279 		}
280 		break;
281 
282 	case EVENT_LINK_LOST:
283 		dev_dbg(adapter->dev, "event: Link lost\n");
284 		adapter->dbg.num_event_link_lost++;
285 		if (priv->media_connected) {
286 			reason_code =
287 				le16_to_cpu(*(__le16 *)adapter->event_body);
288 			mwifiex_reset_connect_state(priv, reason_code);
289 		}
290 		break;
291 
292 	case EVENT_PS_SLEEP:
293 		dev_dbg(adapter->dev, "info: EVENT: SLEEP\n");
294 
295 		adapter->ps_state = PS_STATE_PRE_SLEEP;
296 
297 		mwifiex_check_ps_cond(adapter);
298 		break;
299 
300 	case EVENT_PS_AWAKE:
301 		dev_dbg(adapter->dev, "info: EVENT: AWAKE\n");
302 		if (!adapter->pps_uapsd_mode &&
303 		    priv->media_connected && adapter->sleep_period.period) {
304 				adapter->pps_uapsd_mode = true;
305 				dev_dbg(adapter->dev,
306 					"event: PPS/UAPSD mode activated\n");
307 		}
308 		adapter->tx_lock_flag = false;
309 		if (adapter->pps_uapsd_mode && adapter->gen_null_pkt) {
310 			if (mwifiex_check_last_packet_indication(priv)) {
311 				if (adapter->data_sent) {
312 					adapter->ps_state = PS_STATE_AWAKE;
313 					adapter->pm_wakeup_card_req = false;
314 					adapter->pm_wakeup_fw_try = false;
315 					del_timer(&adapter->wakeup_timer);
316 					break;
317 				}
318 				if (!mwifiex_send_null_packet
319 					(priv,
320 					 MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
321 					 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET))
322 						adapter->ps_state =
323 							PS_STATE_SLEEP;
324 					return 0;
325 			}
326 		}
327 		adapter->ps_state = PS_STATE_AWAKE;
328 		adapter->pm_wakeup_card_req = false;
329 		adapter->pm_wakeup_fw_try = false;
330 		del_timer(&adapter->wakeup_timer);
331 
332 		break;
333 
334 	case EVENT_DEEP_SLEEP_AWAKE:
335 		adapter->if_ops.wakeup_complete(adapter);
336 		dev_dbg(adapter->dev, "event: DS_AWAKE\n");
337 		if (adapter->is_deep_sleep)
338 			adapter->is_deep_sleep = false;
339 		break;
340 
341 	case EVENT_HS_ACT_REQ:
342 		dev_dbg(adapter->dev, "event: HS_ACT_REQ\n");
343 		ret = mwifiex_send_cmd(priv, HostCmd_CMD_802_11_HS_CFG_ENH,
344 				       0, 0, NULL, false);
345 		break;
346 
347 	case EVENT_MIC_ERR_UNICAST:
348 		dev_dbg(adapter->dev, "event: UNICAST MIC ERROR\n");
349 		cfg80211_michael_mic_failure(priv->netdev, priv->cfg_bssid,
350 					     NL80211_KEYTYPE_PAIRWISE,
351 					     -1, NULL, GFP_KERNEL);
352 		break;
353 
354 	case EVENT_MIC_ERR_MULTICAST:
355 		dev_dbg(adapter->dev, "event: MULTICAST MIC ERROR\n");
356 		cfg80211_michael_mic_failure(priv->netdev, priv->cfg_bssid,
357 					     NL80211_KEYTYPE_GROUP,
358 					     -1, NULL, GFP_KERNEL);
359 		break;
360 	case EVENT_MIB_CHANGED:
361 	case EVENT_INIT_DONE:
362 		break;
363 
364 	case EVENT_ADHOC_BCN_LOST:
365 		dev_dbg(adapter->dev, "event: ADHOC_BCN_LOST\n");
366 		priv->adhoc_is_link_sensed = false;
367 		mwifiex_clean_txrx(priv);
368 		mwifiex_stop_net_dev_queue(priv->netdev, adapter);
369 		if (netif_carrier_ok(priv->netdev))
370 			netif_carrier_off(priv->netdev);
371 		break;
372 
373 	case EVENT_BG_SCAN_REPORT:
374 		dev_dbg(adapter->dev, "event: BGS_REPORT\n");
375 		ret = mwifiex_send_cmd(priv, HostCmd_CMD_802_11_BG_SCAN_QUERY,
376 				       HostCmd_ACT_GEN_GET, 0, NULL, false);
377 		break;
378 
379 	case EVENT_PORT_RELEASE:
380 		dev_dbg(adapter->dev, "event: PORT RELEASE\n");
381 		break;
382 
383 	case EVENT_EXT_SCAN_REPORT:
384 		dev_dbg(adapter->dev, "event: EXT_SCAN Report\n");
385 		if (adapter->ext_scan)
386 			ret = mwifiex_handle_event_ext_scan_report(priv,
387 						adapter->event_skb->data);
388 
389 		break;
390 
391 	case EVENT_WMM_STATUS_CHANGE:
392 		dev_dbg(adapter->dev, "event: WMM status changed\n");
393 		ret = mwifiex_send_cmd(priv, HostCmd_CMD_WMM_GET_STATUS,
394 				       0, 0, NULL, false);
395 		break;
396 
397 	case EVENT_RSSI_LOW:
398 		cfg80211_cqm_rssi_notify(priv->netdev,
399 					 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
400 					 GFP_KERNEL);
401 		mwifiex_send_cmd(priv, HostCmd_CMD_RSSI_INFO,
402 				 HostCmd_ACT_GEN_GET, 0, NULL, false);
403 		priv->subsc_evt_rssi_state = RSSI_LOW_RECVD;
404 		dev_dbg(adapter->dev, "event: Beacon RSSI_LOW\n");
405 		break;
406 	case EVENT_SNR_LOW:
407 		dev_dbg(adapter->dev, "event: Beacon SNR_LOW\n");
408 		break;
409 	case EVENT_MAX_FAIL:
410 		dev_dbg(adapter->dev, "event: MAX_FAIL\n");
411 		break;
412 	case EVENT_RSSI_HIGH:
413 		cfg80211_cqm_rssi_notify(priv->netdev,
414 					 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
415 					 GFP_KERNEL);
416 		mwifiex_send_cmd(priv, HostCmd_CMD_RSSI_INFO,
417 				 HostCmd_ACT_GEN_GET, 0, NULL, false);
418 		priv->subsc_evt_rssi_state = RSSI_HIGH_RECVD;
419 		dev_dbg(adapter->dev, "event: Beacon RSSI_HIGH\n");
420 		break;
421 	case EVENT_SNR_HIGH:
422 		dev_dbg(adapter->dev, "event: Beacon SNR_HIGH\n");
423 		break;
424 	case EVENT_DATA_RSSI_LOW:
425 		dev_dbg(adapter->dev, "event: Data RSSI_LOW\n");
426 		break;
427 	case EVENT_DATA_SNR_LOW:
428 		dev_dbg(adapter->dev, "event: Data SNR_LOW\n");
429 		break;
430 	case EVENT_DATA_RSSI_HIGH:
431 		dev_dbg(adapter->dev, "event: Data RSSI_HIGH\n");
432 		break;
433 	case EVENT_DATA_SNR_HIGH:
434 		dev_dbg(adapter->dev, "event: Data SNR_HIGH\n");
435 		break;
436 	case EVENT_LINK_QUALITY:
437 		dev_dbg(adapter->dev, "event: Link Quality\n");
438 		break;
439 	case EVENT_PRE_BEACON_LOST:
440 		dev_dbg(adapter->dev, "event: Pre-Beacon Lost\n");
441 		break;
442 	case EVENT_IBSS_COALESCED:
443 		dev_dbg(adapter->dev, "event: IBSS_COALESCED\n");
444 		ret = mwifiex_send_cmd(priv,
445 				HostCmd_CMD_802_11_IBSS_COALESCING_STATUS,
446 				HostCmd_ACT_GEN_GET, 0, NULL, false);
447 		break;
448 	case EVENT_ADDBA:
449 		dev_dbg(adapter->dev, "event: ADDBA Request\n");
450 		mwifiex_send_cmd(priv, HostCmd_CMD_11N_ADDBA_RSP,
451 				 HostCmd_ACT_GEN_SET, 0,
452 				 adapter->event_body, false);
453 		break;
454 	case EVENT_DELBA:
455 		dev_dbg(adapter->dev, "event: DELBA Request\n");
456 		mwifiex_11n_delete_ba_stream(priv, adapter->event_body);
457 		break;
458 	case EVENT_BA_STREAM_TIEMOUT:
459 		dev_dbg(adapter->dev, "event:  BA Stream timeout\n");
460 		mwifiex_11n_ba_stream_timeout(priv,
461 					      (struct host_cmd_ds_11n_batimeout
462 					       *)
463 					      adapter->event_body);
464 		break;
465 	case EVENT_AMSDU_AGGR_CTRL:
466 		ctrl = le16_to_cpu(*(__le16 *)adapter->event_body);
467 		dev_dbg(adapter->dev, "event: AMSDU_AGGR_CTRL %d\n", ctrl);
468 
469 		adapter->tx_buf_size =
470 				min_t(u16, adapter->curr_tx_buf_size, ctrl);
471 		dev_dbg(adapter->dev, "event: tx_buf_size %d\n",
472 			adapter->tx_buf_size);
473 		break;
474 
475 	case EVENT_WEP_ICV_ERR:
476 		dev_dbg(adapter->dev, "event: WEP ICV error\n");
477 		break;
478 
479 	case EVENT_BW_CHANGE:
480 		dev_dbg(adapter->dev, "event: BW Change\n");
481 		break;
482 
483 	case EVENT_HOSTWAKE_STAIE:
484 		dev_dbg(adapter->dev, "event: HOSTWAKE_STAIE %d\n", eventcause);
485 		break;
486 
487 	case EVENT_REMAIN_ON_CHAN_EXPIRED:
488 		dev_dbg(adapter->dev, "event: Remain on channel expired\n");
489 		cfg80211_remain_on_channel_expired(&priv->wdev,
490 						   priv->roc_cfg.cookie,
491 						   &priv->roc_cfg.chan,
492 						   GFP_ATOMIC);
493 
494 		memset(&priv->roc_cfg, 0x00, sizeof(struct mwifiex_roc_cfg));
495 
496 		break;
497 
498 	case EVENT_CHANNEL_SWITCH_ANN:
499 		dev_dbg(adapter->dev, "event: Channel Switch Announcement\n");
500 		priv->csa_expire_time =
501 				jiffies + msecs_to_jiffies(DFS_CHAN_MOVE_TIME);
502 		priv->csa_chan = priv->curr_bss_params.bss_descriptor.channel;
503 		ret = mwifiex_send_cmd(priv, HostCmd_CMD_802_11_DEAUTHENTICATE,
504 			HostCmd_ACT_GEN_SET, 0,
505 			priv->curr_bss_params.bss_descriptor.mac_address,
506 			false);
507 		break;
508 
509 	case EVENT_TDLS_GENERIC_EVENT:
510 		ret = mwifiex_parse_tdls_event(priv, adapter->event_skb);
511 		break;
512 
513 	case EVENT_TX_STATUS_REPORT:
514 		dev_dbg(adapter->dev, "event: TX_STATUS Report\n");
515 		mwifiex_parse_tx_status_event(priv, adapter->event_body);
516 		break;
517 
518 	case EVENT_CHANNEL_REPORT_RDY:
519 		dev_dbg(adapter->dev, "event: Channel Report\n");
520 		ret = mwifiex_11h_handle_chanrpt_ready(priv,
521 						       adapter->event_skb);
522 		break;
523 	case EVENT_RADAR_DETECTED:
524 		dev_dbg(adapter->dev, "event: Radar detected\n");
525 		ret = mwifiex_11h_handle_radar_detected(priv,
526 							adapter->event_skb);
527 		break;
528 	default:
529 		dev_dbg(adapter->dev, "event: unknown event id: %#x\n",
530 			eventcause);
531 		break;
532 	}
533 
534 	return ret;
535 }
536