summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/quantenna/qtnfmac/event.c
blob: 43d2e7fd6e0211766d4140841a2450f74c1a0788 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
/*
 * Copyright (c) 2015-2016 Quantenna Communications, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "cfg80211.h"
#include "core.h"
#include "qlink.h"
#include "bus.h"
#include "trans.h"
#include "util.h"
#include "event.h"

static int
qtnf_event_handle_sta_assoc(struct qtnf_wmac *mac, struct qtnf_vif *vif,
			    const struct qlink_event_sta_assoc *sta_assoc,
			    u16 len)
{
	const u8 *sta_addr;
	u16 frame_control;
	struct station_info sinfo = { 0 };
	size_t payload_len;
	u16 tlv_type;
	u16 tlv_value_len;
	size_t tlv_full_len;
	const struct qlink_tlv_hdr *tlv;

	if (unlikely(len < sizeof(*sta_assoc))) {
		pr_err("VIF%u.%u: payload is too short (%u < %zu)\n",
		       mac->macid, vif->vifid, len, sizeof(*sta_assoc));
		return -EINVAL;
	}

	if (vif->wdev.iftype != NL80211_IFTYPE_AP) {
		pr_err("VIF%u.%u: STA_ASSOC event when not in AP mode\n",
		       mac->macid, vif->vifid);
		return -EPROTO;
	}

	if (!(vif->bss_status & QTNF_STATE_AP_START)) {
		pr_err("VIF%u.%u: STA_ASSOC event when AP is not started\n",
		       mac->macid, vif->vifid);
		return -EPROTO;
	}

	sta_addr = sta_assoc->sta_addr;
	frame_control = le16_to_cpu(sta_assoc->frame_control);

	pr_debug("VIF%u.%u: MAC:%pM FC:%x\n", mac->macid, vif->vifid, sta_addr,
		 frame_control);

	qtnf_sta_list_add(&vif->sta_list, sta_addr);

	sinfo.assoc_req_ies = NULL;
	sinfo.assoc_req_ies_len = 0;

	payload_len = len - sizeof(*sta_assoc);
	tlv = (struct qlink_tlv_hdr *)sta_assoc->ies;

	while (payload_len >= sizeof(struct qlink_tlv_hdr)) {
		tlv_type = le16_to_cpu(tlv->type);
		tlv_value_len = le16_to_cpu(tlv->len);
		tlv_full_len = tlv_value_len + sizeof(struct qlink_tlv_hdr);

		if (tlv_full_len > payload_len) {
			pr_warn("VIF%u.%u: malformed TLV 0x%.2X; LEN: %u\n",
				mac->macid, vif->vifid, tlv_type,
				tlv_value_len);
			return -EINVAL;
		}

		if (tlv_type == QTN_TLV_ID_IE_SET) {
			sinfo.assoc_req_ies = tlv->val;
			sinfo.assoc_req_ies_len = tlv_value_len;
		}

		payload_len -= tlv_full_len;
		tlv = (struct qlink_tlv_hdr *)(tlv->val + tlv_value_len);
	}

	if (payload_len) {
		pr_warn("VIF%u.%u: malformed TLV buf; bytes left: %zu\n",
			mac->macid, vif->vifid, payload_len);
		return -EINVAL;
	}

	cfg80211_new_sta(vif->netdev, sta_assoc->sta_addr, &sinfo,
			 GFP_KERNEL);

	return 0;
}

static int
qtnf_event_handle_sta_deauth(struct qtnf_wmac *mac, struct qtnf_vif *vif,
			     const struct qlink_event_sta_deauth *sta_deauth,
			     u16 len)
{
	const u8 *sta_addr;
	u16 reason;

	if (unlikely(len < sizeof(*sta_deauth))) {
		pr_err("VIF%u.%u: payload is too short (%u < %zu)\n",
		       mac->macid, vif->vifid, len,
		       sizeof(struct qlink_event_sta_deauth));
		return -EINVAL;
	}

	if (vif->wdev.iftype != NL80211_IFTYPE_AP) {
		pr_err("VIF%u.%u: STA_DEAUTH event when not in AP mode\n",
		       mac->macid, vif->vifid);
		return -EPROTO;
	}

	if (!(vif->bss_status & QTNF_STATE_AP_START)) {
		pr_err("VIF%u.%u: STA_DEAUTH event when AP is not started\n",
		       mac->macid, vif->vifid);
		return -EPROTO;
	}

	sta_addr = sta_deauth->sta_addr;
	reason = le16_to_cpu(sta_deauth->reason);

	pr_debug("VIF%u.%u: MAC:%pM reason:%x\n", mac->macid, vif->vifid,
		 sta_addr, reason);

	if (qtnf_sta_list_del(&vif->sta_list, sta_addr))
		cfg80211_del_sta(vif->netdev, sta_deauth->sta_addr,
				 GFP_KERNEL);

	return 0;
}

static int
qtnf_event_handle_bss_join(struct qtnf_vif *vif,
			   const struct qlink_event_bss_join *join_info,
			   u16 len)
{
	if (unlikely(len < sizeof(*join_info))) {
		pr_err("VIF%u.%u: payload is too short (%u < %zu)\n",
		       vif->mac->macid, vif->vifid, len,
		       sizeof(struct qlink_event_bss_join));
		return -EINVAL;
	}

	if (vif->wdev.iftype != NL80211_IFTYPE_STATION) {
		pr_err("VIF%u.%u: BSS_JOIN event when not in STA mode\n",
		       vif->mac->macid, vif->vifid);
		return -EPROTO;
	}

	if (vif->sta_state != QTNF_STA_CONNECTING) {
		pr_err("VIF%u.%u: BSS_JOIN event when STA is not connecting\n",
		       vif->mac->macid, vif->vifid);
		return -EPROTO;
	}

	pr_debug("VIF%u.%u: BSSID:%pM\n", vif->mac->macid, vif->vifid,
		 join_info->bssid);

	cfg80211_connect_result(vif->netdev, join_info->bssid, NULL, 0, NULL,
				0, le16_to_cpu(join_info->status), GFP_KERNEL);

	if (le16_to_cpu(join_info->status) == WLAN_STATUS_SUCCESS) {
		vif->sta_state = QTNF_STA_CONNECTED;
		netif_carrier_on(vif->netdev);
	} else {
		vif->sta_state = QTNF_STA_DISCONNECTED;
	}

	return 0;
}

static int
qtnf_event_handle_bss_leave(struct qtnf_vif *vif,
			    const struct qlink_event_bss_leave *leave_info,
			    u16 len)
{
	if (unlikely(len < sizeof(*leave_info))) {
		pr_err("VIF%u.%u: payload is too short (%u < %zu)\n",
		       vif->mac->macid, vif->vifid, len,
		       sizeof(struct qlink_event_bss_leave));
		return -EINVAL;
	}

	if (vif->wdev.iftype != NL80211_IFTYPE_STATION) {
		pr_err("VIF%u.%u: BSS_LEAVE event when not in STA mode\n",
		       vif->mac->macid, vif->vifid);
		return -EPROTO;
	}

	if (vif->sta_state != QTNF_STA_CONNECTED) {
		pr_err("VIF%u.%u: BSS_LEAVE event when STA is not connected\n",
		       vif->mac->macid, vif->vifid);
		return -EPROTO;
	}

	pr_debug("VIF%u.%u: disconnected\n", vif->mac->macid, vif->vifid);

	cfg80211_disconnected(vif->netdev, le16_to_cpu(leave_info->reason),
			      NULL, 0, 0, GFP_KERNEL);

	vif->sta_state = QTNF_STA_DISCONNECTED;
	netif_carrier_off(vif->netdev);

	return 0;
}

static int
qtnf_event_handle_mgmt_received(struct qtnf_vif *vif,
				const struct qlink_event_rxmgmt *rxmgmt,
				u16 len)
{
	const size_t min_len = sizeof(*rxmgmt) +
			       sizeof(struct ieee80211_hdr_3addr);
	const struct ieee80211_hdr_3addr *frame = (void *)rxmgmt->frame_data;
	const u16 frame_len = len - sizeof(*rxmgmt);
	enum nl80211_rxmgmt_flags flags = 0;

	if (unlikely(len < min_len)) {
		pr_err("VIF%u.%u: payload is too short (%u < %zu)\n",
		       vif->mac->macid, vif->vifid, len, min_len);
		return -EINVAL;
	}

	if (le32_to_cpu(rxmgmt->flags) & QLINK_RXMGMT_FLAG_ANSWERED)
		flags |= NL80211_RXMGMT_FLAG_ANSWERED;

	pr_debug("%s LEN:%u FC:%.4X SA:%pM\n", vif->netdev->name, frame_len,
		 le16_to_cpu(frame->frame_control), frame->addr2);

	cfg80211_rx_mgmt(&vif->wdev, le32_to_cpu(rxmgmt->freq),
			 le32_to_cpu(rxmgmt->sig_dbm), rxmgmt->frame_data,
			 frame_len, flags);

	return 0;
}

static int
qtnf_event_handle_scan_results(struct qtnf_vif *vif,
			       const struct qlink_event_scan_result *sr,
			       u16 len)
{
	struct cfg80211_bss *bss;
	struct ieee80211_channel *channel;
	struct wiphy *wiphy = priv_to_wiphy(vif->mac);
	enum cfg80211_bss_frame_type frame_type;
	size_t payload_len;
	u16 tlv_type;
	u16 tlv_value_len;
	size_t tlv_full_len;
	const struct qlink_tlv_hdr *tlv;

	const u8 *ies = NULL;
	size_t ies_len = 0;

	if (len < sizeof(*sr)) {
		pr_err("VIF%u.%u: payload is too short\n", vif->mac->macid,
		       vif->vifid);
		return -EINVAL;
	}

	channel = ieee80211_get_channel(wiphy, le16_to_cpu(sr->freq));
	if (!channel) {
		pr_err("VIF%u.%u: channel at %u MHz not found\n",
		       vif->mac->macid, vif->vifid, le16_to_cpu(sr->freq));
		return -EINVAL;
	}

	switch (sr->frame_type) {
	case QLINK_BSS_FTYPE_BEACON:
		frame_type = CFG80211_BSS_FTYPE_BEACON;
		break;
	case QLINK_BSS_FTYPE_PRESP:
		frame_type = CFG80211_BSS_FTYPE_PRESP;
		break;
	default:
		frame_type = CFG80211_BSS_FTYPE_UNKNOWN;
	}

	payload_len = len - sizeof(*sr);
	tlv = (struct qlink_tlv_hdr *)sr->payload;

	while (payload_len >= sizeof(struct qlink_tlv_hdr)) {
		tlv_type = le16_to_cpu(tlv->type);
		tlv_value_len = le16_to_cpu(tlv->len);
		tlv_full_len = tlv_value_len + sizeof(struct qlink_tlv_hdr);

		if (tlv_full_len > payload_len) {
			pr_warn("VIF%u.%u: malformed TLV 0x%.2X; LEN: %u\n",
				vif->mac->macid, vif->vifid, tlv_type,
				tlv_value_len);
			return -EINVAL;
		}

		if (tlv_type == QTN_TLV_ID_IE_SET) {
			ies = tlv->val;
			ies_len = tlv_value_len;
		}

		payload_len -= tlv_full_len;
		tlv = (struct qlink_tlv_hdr *)(tlv->val + tlv_value_len);
	}

	if (payload_len) {
		pr_warn("VIF%u.%u: malformed TLV buf; bytes left: %zu\n",
			vif->mac->macid, vif->vifid, payload_len);
		return -EINVAL;
	}

	bss = cfg80211_inform_bss(wiphy, channel, frame_type,
				  sr->bssid, get_unaligned_le64(&sr->tsf),
				  le16_to_cpu(sr->capab),
				  le16_to_cpu(sr->bintval), ies, ies_len,
				  sr->signal, GFP_KERNEL);
	if (!bss)
		return -ENOMEM;

	cfg80211_put_bss(wiphy, bss);

	return 0;
}

static int
qtnf_event_handle_scan_complete(struct qtnf_wmac *mac,
				const struct qlink_event_scan_complete *status,
				u16 len)
{
	if (len < sizeof(*status)) {
		pr_err("MAC%u: payload is too short\n", mac->macid);
		return -EINVAL;
	}

	qtnf_scan_done(mac, le32_to_cpu(status->flags) & QLINK_SCAN_ABORTED);

	return 0;
}

static int
qtnf_event_handle_freq_change(struct qtnf_wmac *mac,
			      const struct qlink_event_freq_change *data,
			      u16 len)
{
	struct wiphy *wiphy = priv_to_wiphy(mac);
	struct cfg80211_chan_def chandef;
	struct ieee80211_channel *chan;
	struct qtnf_vif *vif;
	int freq;
	int i;

	if (len < sizeof(*data)) {
		pr_err("payload is too short\n");
		return -EINVAL;
	}

	freq = le32_to_cpu(data->freq);
	chan = ieee80211_get_channel(wiphy, freq);
	if (!chan) {
		pr_err("channel at %d MHz not found\n", freq);
		return -EINVAL;
	}

	pr_debug("MAC%d switch to new channel %u MHz\n", mac->macid, freq);

	if (mac->status & QTNF_MAC_CSA_ACTIVE) {
		mac->status &= ~QTNF_MAC_CSA_ACTIVE;
		if (chan->hw_value != mac->csa_chandef.chan->hw_value)
			pr_warn("unexpected switch to %u during CSA to %u\n",
				chan->hw_value,
				mac->csa_chandef.chan->hw_value);
	}

	/* FIXME: need to figure out proper nl80211_channel_type value */
	cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_HT20);
	/* fall-back to minimal safe chandef description */
	if (!cfg80211_chandef_valid(&chandef))
		cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_HT20);

	memcpy(&mac->chandef, &chandef, sizeof(mac->chandef));

	for (i = 0; i < QTNF_MAX_INTF; i++) {
		vif = &mac->iflist[i];
		if (vif->wdev.iftype == NL80211_IFTYPE_UNSPECIFIED)
			continue;

		if (vif->netdev) {
			mutex_lock(&vif->wdev.mtx);
			cfg80211_ch_switch_notify(vif->netdev, &chandef);
			mutex_unlock(&vif->wdev.mtx);
		}
	}

	return 0;
}

static int qtnf_event_parse(struct qtnf_wmac *mac,
			    const struct sk_buff *event_skb)
{
	const struct qlink_event *event;
	struct qtnf_vif *vif = NULL;
	int ret = -1;
	u16 event_id;
	u16 event_len;

	event = (const struct qlink_event *)event_skb->data;
	event_id = le16_to_cpu(event->event_id);
	event_len = le16_to_cpu(event->mhdr.len);

	if (likely(event->vifid < QTNF_MAX_INTF)) {
		vif = &mac->iflist[event->vifid];
	} else {
		pr_err("invalid vif(%u)\n", event->vifid);
		return -EINVAL;
	}

	switch (event_id) {
	case QLINK_EVENT_STA_ASSOCIATED:
		ret = qtnf_event_handle_sta_assoc(mac, vif, (const void *)event,
						  event_len);
		break;
	case QLINK_EVENT_STA_DEAUTH:
		ret = qtnf_event_handle_sta_deauth(mac, vif,
						   (const void *)event,
						   event_len);
		break;
	case QLINK_EVENT_MGMT_RECEIVED:
		ret = qtnf_event_handle_mgmt_received(vif, (const void *)event,
						      event_len);
		break;
	case QLINK_EVENT_SCAN_RESULTS:
		ret = qtnf_event_handle_scan_results(vif, (const void *)event,
						     event_len);
		break;
	case QLINK_EVENT_SCAN_COMPLETE:
		ret = qtnf_event_handle_scan_complete(mac, (const void *)event,
						      event_len);
		break;
	case QLINK_EVENT_BSS_JOIN:
		ret = qtnf_event_handle_bss_join(vif, (const void *)event,
						 event_len);
		break;
	case QLINK_EVENT_BSS_LEAVE:
		ret = qtnf_event_handle_bss_leave(vif, (const void *)event,
						  event_len);
		break;
	case QLINK_EVENT_FREQ_CHANGE:
		ret = qtnf_event_handle_freq_change(mac, (const void *)event,
						    event_len);
		break;
	default:
		pr_warn("unknown event type: %x\n", event_id);
		break;
	}

	return ret;
}

static int qtnf_event_process_skb(struct qtnf_bus *bus,
				  const struct sk_buff *skb)
{
	const struct qlink_event *event;
	struct qtnf_wmac *mac;
	int res;

	if (unlikely(!skb || skb->len < sizeof(*event))) {
		pr_err("invalid event buffer\n");
		return -EINVAL;
	}

	event = (struct qlink_event *)skb->data;

	mac = qtnf_core_get_mac(bus, event->macid);

	pr_debug("new event id:%x len:%u mac:%u vif:%u\n",
		 le16_to_cpu(event->event_id), le16_to_cpu(event->mhdr.len),
		 event->macid, event->vifid);

	if (unlikely(!mac))
		return -ENXIO;

	qtnf_bus_lock(bus);
	res = qtnf_event_parse(mac, skb);
	qtnf_bus_unlock(bus);

	return res;
}

void qtnf_event_work_handler(struct work_struct *work)
{
	struct qtnf_bus *bus = container_of(work, struct qtnf_bus, event_work);
	struct sk_buff_head *event_queue = &bus->trans.event_queue;
	struct sk_buff *current_event_skb = skb_dequeue(event_queue);

	while (current_event_skb) {
		qtnf_event_process_skb(bus, current_event_skb);
		dev_kfree_skb_any(current_event_skb);
		current_event_skb = skb_dequeue(event_queue);
	}
}