xref: /openbmc/linux/net/wireless/util.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
1 /*
2  * Wireless utility functions
3  *
4  * Copyright 2007-2009	Johannes Berg <johannes@sipsolutions.net>
5  */
6 #include <linux/bitops.h>
7 #include <linux/etherdevice.h>
8 #include <net/cfg80211.h>
9 #include <net/ip.h>
10 #include "core.h"
11 
12 struct ieee80211_rate *
13 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
14 			    u32 basic_rates, int bitrate)
15 {
16 	struct ieee80211_rate *result = &sband->bitrates[0];
17 	int i;
18 
19 	for (i = 0; i < sband->n_bitrates; i++) {
20 		if (!(basic_rates & BIT(i)))
21 			continue;
22 		if (sband->bitrates[i].bitrate > bitrate)
23 			continue;
24 		result = &sband->bitrates[i];
25 	}
26 
27 	return result;
28 }
29 EXPORT_SYMBOL(ieee80211_get_response_rate);
30 
31 int ieee80211_channel_to_frequency(int chan)
32 {
33 	if (chan < 14)
34 		return 2407 + chan * 5;
35 
36 	if (chan == 14)
37 		return 2484;
38 
39 	/* FIXME: 802.11j 17.3.8.3.2 */
40 	return (chan + 1000) * 5;
41 }
42 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
43 
44 int ieee80211_frequency_to_channel(int freq)
45 {
46 	if (freq == 2484)
47 		return 14;
48 
49 	if (freq < 2484)
50 		return (freq - 2407) / 5;
51 
52 	/* FIXME: 802.11j 17.3.8.3.2 */
53 	return freq/5 - 1000;
54 }
55 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
56 
57 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
58 						  int freq)
59 {
60 	enum ieee80211_band band;
61 	struct ieee80211_supported_band *sband;
62 	int i;
63 
64 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
65 		sband = wiphy->bands[band];
66 
67 		if (!sband)
68 			continue;
69 
70 		for (i = 0; i < sband->n_channels; i++) {
71 			if (sband->channels[i].center_freq == freq)
72 				return &sband->channels[i];
73 		}
74 	}
75 
76 	return NULL;
77 }
78 EXPORT_SYMBOL(__ieee80211_get_channel);
79 
80 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
81 				     enum ieee80211_band band)
82 {
83 	int i, want;
84 
85 	switch (band) {
86 	case IEEE80211_BAND_5GHZ:
87 		want = 3;
88 		for (i = 0; i < sband->n_bitrates; i++) {
89 			if (sband->bitrates[i].bitrate == 60 ||
90 			    sband->bitrates[i].bitrate == 120 ||
91 			    sband->bitrates[i].bitrate == 240) {
92 				sband->bitrates[i].flags |=
93 					IEEE80211_RATE_MANDATORY_A;
94 				want--;
95 			}
96 		}
97 		WARN_ON(want);
98 		break;
99 	case IEEE80211_BAND_2GHZ:
100 		want = 7;
101 		for (i = 0; i < sband->n_bitrates; i++) {
102 			if (sband->bitrates[i].bitrate == 10) {
103 				sband->bitrates[i].flags |=
104 					IEEE80211_RATE_MANDATORY_B |
105 					IEEE80211_RATE_MANDATORY_G;
106 				want--;
107 			}
108 
109 			if (sband->bitrates[i].bitrate == 20 ||
110 			    sband->bitrates[i].bitrate == 55 ||
111 			    sband->bitrates[i].bitrate == 110 ||
112 			    sband->bitrates[i].bitrate == 60 ||
113 			    sband->bitrates[i].bitrate == 120 ||
114 			    sband->bitrates[i].bitrate == 240) {
115 				sband->bitrates[i].flags |=
116 					IEEE80211_RATE_MANDATORY_G;
117 				want--;
118 			}
119 
120 			if (sband->bitrates[i].bitrate != 10 &&
121 			    sband->bitrates[i].bitrate != 20 &&
122 			    sband->bitrates[i].bitrate != 55 &&
123 			    sband->bitrates[i].bitrate != 110)
124 				sband->bitrates[i].flags |=
125 					IEEE80211_RATE_ERP_G;
126 		}
127 		WARN_ON(want != 0 && want != 3 && want != 6);
128 		break;
129 	case IEEE80211_NUM_BANDS:
130 		WARN_ON(1);
131 		break;
132 	}
133 }
134 
135 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
136 {
137 	enum ieee80211_band band;
138 
139 	for (band = 0; band < IEEE80211_NUM_BANDS; band++)
140 		if (wiphy->bands[band])
141 			set_mandatory_flags_band(wiphy->bands[band], band);
142 }
143 
144 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
145 				   struct key_params *params, int key_idx,
146 				   const u8 *mac_addr)
147 {
148 	int i;
149 
150 	if (key_idx > 5)
151 		return -EINVAL;
152 
153 	/*
154 	 * Disallow pairwise keys with non-zero index unless it's WEP
155 	 * (because current deployments use pairwise WEP keys with
156 	 * non-zero indizes but 802.11i clearly specifies to use zero)
157 	 */
158 	if (mac_addr && key_idx &&
159 	    params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
160 	    params->cipher != WLAN_CIPHER_SUITE_WEP104)
161 		return -EINVAL;
162 
163 	switch (params->cipher) {
164 	case WLAN_CIPHER_SUITE_WEP40:
165 		if (params->key_len != WLAN_KEY_LEN_WEP40)
166 			return -EINVAL;
167 		break;
168 	case WLAN_CIPHER_SUITE_TKIP:
169 		if (params->key_len != WLAN_KEY_LEN_TKIP)
170 			return -EINVAL;
171 		break;
172 	case WLAN_CIPHER_SUITE_CCMP:
173 		if (params->key_len != WLAN_KEY_LEN_CCMP)
174 			return -EINVAL;
175 		break;
176 	case WLAN_CIPHER_SUITE_WEP104:
177 		if (params->key_len != WLAN_KEY_LEN_WEP104)
178 			return -EINVAL;
179 		break;
180 	case WLAN_CIPHER_SUITE_AES_CMAC:
181 		if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
182 			return -EINVAL;
183 		break;
184 	default:
185 		return -EINVAL;
186 	}
187 
188 	if (params->seq) {
189 		switch (params->cipher) {
190 		case WLAN_CIPHER_SUITE_WEP40:
191 		case WLAN_CIPHER_SUITE_WEP104:
192 			/* These ciphers do not use key sequence */
193 			return -EINVAL;
194 		case WLAN_CIPHER_SUITE_TKIP:
195 		case WLAN_CIPHER_SUITE_CCMP:
196 		case WLAN_CIPHER_SUITE_AES_CMAC:
197 			if (params->seq_len != 6)
198 				return -EINVAL;
199 			break;
200 		}
201 	}
202 
203 	for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
204 		if (params->cipher == rdev->wiphy.cipher_suites[i])
205 			break;
206 	if (i == rdev->wiphy.n_cipher_suites)
207 		return -EINVAL;
208 
209 	return 0;
210 }
211 
212 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
213 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
214 const unsigned char rfc1042_header[] __aligned(2) =
215 	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
216 EXPORT_SYMBOL(rfc1042_header);
217 
218 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
219 const unsigned char bridge_tunnel_header[] __aligned(2) =
220 	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
221 EXPORT_SYMBOL(bridge_tunnel_header);
222 
223 unsigned int ieee80211_hdrlen(__le16 fc)
224 {
225 	unsigned int hdrlen = 24;
226 
227 	if (ieee80211_is_data(fc)) {
228 		if (ieee80211_has_a4(fc))
229 			hdrlen = 30;
230 		if (ieee80211_is_data_qos(fc))
231 			hdrlen += IEEE80211_QOS_CTL_LEN;
232 		goto out;
233 	}
234 
235 	if (ieee80211_is_ctl(fc)) {
236 		/*
237 		 * ACK and CTS are 10 bytes, all others 16. To see how
238 		 * to get this condition consider
239 		 *   subtype mask:   0b0000000011110000 (0x00F0)
240 		 *   ACK subtype:    0b0000000011010000 (0x00D0)
241 		 *   CTS subtype:    0b0000000011000000 (0x00C0)
242 		 *   bits that matter:         ^^^      (0x00E0)
243 		 *   value of those: 0b0000000011000000 (0x00C0)
244 		 */
245 		if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
246 			hdrlen = 10;
247 		else
248 			hdrlen = 16;
249 	}
250 out:
251 	return hdrlen;
252 }
253 EXPORT_SYMBOL(ieee80211_hdrlen);
254 
255 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
256 {
257 	const struct ieee80211_hdr *hdr =
258 			(const struct ieee80211_hdr *)skb->data;
259 	unsigned int hdrlen;
260 
261 	if (unlikely(skb->len < 10))
262 		return 0;
263 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
264 	if (unlikely(hdrlen > skb->len))
265 		return 0;
266 	return hdrlen;
267 }
268 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
269 
270 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
271 {
272 	int ae = meshhdr->flags & MESH_FLAGS_AE;
273 	/* 7.1.3.5a.2 */
274 	switch (ae) {
275 	case 0:
276 		return 6;
277 	case MESH_FLAGS_AE_A4:
278 		return 12;
279 	case MESH_FLAGS_AE_A5_A6:
280 		return 18;
281 	case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
282 		return 24;
283 	default:
284 		return 6;
285 	}
286 }
287 
288 int ieee80211_data_to_8023(struct sk_buff *skb, u8 *addr,
289 			   enum nl80211_iftype iftype)
290 {
291 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
292 	u16 hdrlen, ethertype;
293 	u8 *payload;
294 	u8 dst[ETH_ALEN];
295 	u8 src[ETH_ALEN] __aligned(2);
296 
297 	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
298 		return -1;
299 
300 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
301 
302 	/* convert IEEE 802.11 header + possible LLC headers into Ethernet
303 	 * header
304 	 * IEEE 802.11 address fields:
305 	 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
306 	 *   0     0   DA    SA    BSSID n/a
307 	 *   0     1   DA    BSSID SA    n/a
308 	 *   1     0   BSSID SA    DA    n/a
309 	 *   1     1   RA    TA    DA    SA
310 	 */
311 	memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
312 	memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
313 
314 	switch (hdr->frame_control &
315 		cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
316 	case cpu_to_le16(IEEE80211_FCTL_TODS):
317 		if (unlikely(iftype != NL80211_IFTYPE_AP &&
318 			     iftype != NL80211_IFTYPE_AP_VLAN))
319 			return -1;
320 		break;
321 	case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
322 		if (unlikely(iftype != NL80211_IFTYPE_WDS &&
323 			     iftype != NL80211_IFTYPE_MESH_POINT &&
324 			     iftype != NL80211_IFTYPE_AP_VLAN &&
325 			     iftype != NL80211_IFTYPE_STATION))
326 			return -1;
327 		if (iftype == NL80211_IFTYPE_MESH_POINT) {
328 			struct ieee80211s_hdr *meshdr =
329 				(struct ieee80211s_hdr *) (skb->data + hdrlen);
330 			hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
331 			if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
332 				memcpy(dst, meshdr->eaddr1, ETH_ALEN);
333 				memcpy(src, meshdr->eaddr2, ETH_ALEN);
334 			}
335 		}
336 		break;
337 	case cpu_to_le16(IEEE80211_FCTL_FROMDS):
338 		if ((iftype != NL80211_IFTYPE_STATION &&
339 		    iftype != NL80211_IFTYPE_MESH_POINT) ||
340 		    (is_multicast_ether_addr(dst) &&
341 		     !compare_ether_addr(src, addr)))
342 			return -1;
343 		if (iftype == NL80211_IFTYPE_MESH_POINT) {
344 			struct ieee80211s_hdr *meshdr =
345 				(struct ieee80211s_hdr *) (skb->data + hdrlen);
346 			hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
347 			if (meshdr->flags & MESH_FLAGS_AE_A4)
348 				memcpy(src, meshdr->eaddr1, ETH_ALEN);
349 		}
350 		break;
351 	case cpu_to_le16(0):
352 		if (iftype != NL80211_IFTYPE_ADHOC)
353 			return -1;
354 		break;
355 	}
356 
357 	if (unlikely(skb->len - hdrlen < 8))
358 		return -1;
359 
360 	payload = skb->data + hdrlen;
361 	ethertype = (payload[6] << 8) | payload[7];
362 
363 	if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
364 		    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
365 		   compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
366 		/* remove RFC1042 or Bridge-Tunnel encapsulation and
367 		 * replace EtherType */
368 		skb_pull(skb, hdrlen + 6);
369 		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
370 		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
371 	} else {
372 		struct ethhdr *ehdr;
373 		__be16 len;
374 
375 		skb_pull(skb, hdrlen);
376 		len = htons(skb->len);
377 		ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
378 		memcpy(ehdr->h_dest, dst, ETH_ALEN);
379 		memcpy(ehdr->h_source, src, ETH_ALEN);
380 		ehdr->h_proto = len;
381 	}
382 	return 0;
383 }
384 EXPORT_SYMBOL(ieee80211_data_to_8023);
385 
386 int ieee80211_data_from_8023(struct sk_buff *skb, u8 *addr,
387 			     enum nl80211_iftype iftype, u8 *bssid, bool qos)
388 {
389 	struct ieee80211_hdr hdr;
390 	u16 hdrlen, ethertype;
391 	__le16 fc;
392 	const u8 *encaps_data;
393 	int encaps_len, skip_header_bytes;
394 	int nh_pos, h_pos;
395 	int head_need;
396 
397 	if (unlikely(skb->len < ETH_HLEN))
398 		return -EINVAL;
399 
400 	nh_pos = skb_network_header(skb) - skb->data;
401 	h_pos = skb_transport_header(skb) - skb->data;
402 
403 	/* convert Ethernet header to proper 802.11 header (based on
404 	 * operation mode) */
405 	ethertype = (skb->data[12] << 8) | skb->data[13];
406 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
407 
408 	switch (iftype) {
409 	case NL80211_IFTYPE_AP:
410 	case NL80211_IFTYPE_AP_VLAN:
411 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
412 		/* DA BSSID SA */
413 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
414 		memcpy(hdr.addr2, addr, ETH_ALEN);
415 		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
416 		hdrlen = 24;
417 		break;
418 	case NL80211_IFTYPE_STATION:
419 		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
420 		/* BSSID SA DA */
421 		memcpy(hdr.addr1, bssid, ETH_ALEN);
422 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
423 		memcpy(hdr.addr3, skb->data, ETH_ALEN);
424 		hdrlen = 24;
425 		break;
426 	case NL80211_IFTYPE_ADHOC:
427 		/* DA SA BSSID */
428 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
429 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
430 		memcpy(hdr.addr3, bssid, ETH_ALEN);
431 		hdrlen = 24;
432 		break;
433 	default:
434 		return -EOPNOTSUPP;
435 	}
436 
437 	if (qos) {
438 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
439 		hdrlen += 2;
440 	}
441 
442 	hdr.frame_control = fc;
443 	hdr.duration_id = 0;
444 	hdr.seq_ctrl = 0;
445 
446 	skip_header_bytes = ETH_HLEN;
447 	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
448 		encaps_data = bridge_tunnel_header;
449 		encaps_len = sizeof(bridge_tunnel_header);
450 		skip_header_bytes -= 2;
451 	} else if (ethertype > 0x600) {
452 		encaps_data = rfc1042_header;
453 		encaps_len = sizeof(rfc1042_header);
454 		skip_header_bytes -= 2;
455 	} else {
456 		encaps_data = NULL;
457 		encaps_len = 0;
458 	}
459 
460 	skb_pull(skb, skip_header_bytes);
461 	nh_pos -= skip_header_bytes;
462 	h_pos -= skip_header_bytes;
463 
464 	head_need = hdrlen + encaps_len - skb_headroom(skb);
465 
466 	if (head_need > 0 || skb_cloned(skb)) {
467 		head_need = max(head_need, 0);
468 		if (head_need)
469 			skb_orphan(skb);
470 
471 		if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
472 			printk(KERN_ERR "failed to reallocate Tx buffer\n");
473 			return -ENOMEM;
474 		}
475 		skb->truesize += head_need;
476 	}
477 
478 	if (encaps_data) {
479 		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
480 		nh_pos += encaps_len;
481 		h_pos += encaps_len;
482 	}
483 
484 	memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
485 
486 	nh_pos += hdrlen;
487 	h_pos += hdrlen;
488 
489 	/* Update skb pointers to various headers since this modified frame
490 	 * is going to go through Linux networking code that may potentially
491 	 * need things like pointer to IP header. */
492 	skb_set_mac_header(skb, 0);
493 	skb_set_network_header(skb, nh_pos);
494 	skb_set_transport_header(skb, h_pos);
495 
496 	return 0;
497 }
498 EXPORT_SYMBOL(ieee80211_data_from_8023);
499 
500 /* Given a data frame determine the 802.1p/1d tag to use. */
501 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
502 {
503 	unsigned int dscp;
504 
505 	/* skb->priority values from 256->263 are magic values to
506 	 * directly indicate a specific 802.1d priority.  This is used
507 	 * to allow 802.1d priority to be passed directly in from VLAN
508 	 * tags, etc.
509 	 */
510 	if (skb->priority >= 256 && skb->priority <= 263)
511 		return skb->priority - 256;
512 
513 	switch (skb->protocol) {
514 	case htons(ETH_P_IP):
515 		dscp = ip_hdr(skb)->tos & 0xfc;
516 		break;
517 	default:
518 		return 0;
519 	}
520 
521 	return dscp >> 5;
522 }
523 EXPORT_SYMBOL(cfg80211_classify8021d);
524 
525 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
526 {
527 	u8 *end, *pos;
528 
529 	pos = bss->information_elements;
530 	if (pos == NULL)
531 		return NULL;
532 	end = pos + bss->len_information_elements;
533 
534 	while (pos + 1 < end) {
535 		if (pos + 2 + pos[1] > end)
536 			break;
537 		if (pos[0] == ie)
538 			return pos;
539 		pos += 2 + pos[1];
540 	}
541 
542 	return NULL;
543 }
544 EXPORT_SYMBOL(ieee80211_bss_get_ie);
545 
546 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
547 {
548 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
549 	struct net_device *dev = wdev->netdev;
550 	int i;
551 
552 	if (!wdev->connect_keys)
553 		return;
554 
555 	for (i = 0; i < 6; i++) {
556 		if (!wdev->connect_keys->params[i].cipher)
557 			continue;
558 		if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
559 					&wdev->connect_keys->params[i])) {
560 			printk(KERN_ERR "%s: failed to set key %d\n",
561 				dev->name, i);
562 			continue;
563 		}
564 		if (wdev->connect_keys->def == i)
565 			if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
566 				printk(KERN_ERR "%s: failed to set defkey %d\n",
567 					dev->name, i);
568 				continue;
569 			}
570 		if (wdev->connect_keys->defmgmt == i)
571 			if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
572 				printk(KERN_ERR "%s: failed to set mgtdef %d\n",
573 					dev->name, i);
574 	}
575 
576 	kfree(wdev->connect_keys);
577 	wdev->connect_keys = NULL;
578 }
579 
580 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
581 {
582 	struct cfg80211_event *ev;
583 	unsigned long flags;
584 	const u8 *bssid = NULL;
585 
586 	spin_lock_irqsave(&wdev->event_lock, flags);
587 	while (!list_empty(&wdev->event_list)) {
588 		ev = list_first_entry(&wdev->event_list,
589 				      struct cfg80211_event, list);
590 		list_del(&ev->list);
591 		spin_unlock_irqrestore(&wdev->event_lock, flags);
592 
593 		wdev_lock(wdev);
594 		switch (ev->type) {
595 		case EVENT_CONNECT_RESULT:
596 			if (!is_zero_ether_addr(ev->cr.bssid))
597 				bssid = ev->cr.bssid;
598 			__cfg80211_connect_result(
599 				wdev->netdev, bssid,
600 				ev->cr.req_ie, ev->cr.req_ie_len,
601 				ev->cr.resp_ie, ev->cr.resp_ie_len,
602 				ev->cr.status,
603 				ev->cr.status == WLAN_STATUS_SUCCESS,
604 				NULL);
605 			break;
606 		case EVENT_ROAMED:
607 			__cfg80211_roamed(wdev, ev->rm.bssid,
608 					  ev->rm.req_ie, ev->rm.req_ie_len,
609 					  ev->rm.resp_ie, ev->rm.resp_ie_len);
610 			break;
611 		case EVENT_DISCONNECTED:
612 			__cfg80211_disconnected(wdev->netdev,
613 						ev->dc.ie, ev->dc.ie_len,
614 						ev->dc.reason, true);
615 			break;
616 		case EVENT_IBSS_JOINED:
617 			__cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
618 			break;
619 		}
620 		wdev_unlock(wdev);
621 
622 		kfree(ev);
623 
624 		spin_lock_irqsave(&wdev->event_lock, flags);
625 	}
626 	spin_unlock_irqrestore(&wdev->event_lock, flags);
627 }
628 
629 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
630 {
631 	struct wireless_dev *wdev;
632 
633 	ASSERT_RTNL();
634 	ASSERT_RDEV_LOCK(rdev);
635 
636 	mutex_lock(&rdev->devlist_mtx);
637 
638 	list_for_each_entry(wdev, &rdev->netdev_list, list)
639 		cfg80211_process_wdev_events(wdev);
640 
641 	mutex_unlock(&rdev->devlist_mtx);
642 }
643 
644 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
645 			  struct net_device *dev, enum nl80211_iftype ntype,
646 			  u32 *flags, struct vif_params *params)
647 {
648 	int err;
649 	enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
650 
651 	ASSERT_RDEV_LOCK(rdev);
652 
653 	/* don't support changing VLANs, you just re-create them */
654 	if (otype == NL80211_IFTYPE_AP_VLAN)
655 		return -EOPNOTSUPP;
656 
657 	if (!rdev->ops->change_virtual_intf ||
658 	    !(rdev->wiphy.interface_modes & (1 << ntype)))
659 		return -EOPNOTSUPP;
660 
661 	/* if it's part of a bridge, reject changing type to station/ibss */
662 	if (dev->br_port && (ntype == NL80211_IFTYPE_ADHOC ||
663 			     ntype == NL80211_IFTYPE_STATION))
664 		return -EBUSY;
665 
666 	if (ntype != otype) {
667 		dev->ieee80211_ptr->use_4addr = false;
668 
669 		switch (otype) {
670 		case NL80211_IFTYPE_ADHOC:
671 			cfg80211_leave_ibss(rdev, dev, false);
672 			break;
673 		case NL80211_IFTYPE_STATION:
674 			cfg80211_disconnect(rdev, dev,
675 					    WLAN_REASON_DEAUTH_LEAVING, true);
676 			break;
677 		case NL80211_IFTYPE_MESH_POINT:
678 			/* mesh should be handled? */
679 			break;
680 		default:
681 			break;
682 		}
683 
684 		cfg80211_process_rdev_events(rdev);
685 	}
686 
687 	err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
688 					     ntype, flags, params);
689 
690 	WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
691 
692 	if (!err && params && params->use_4addr != -1)
693 		dev->ieee80211_ptr->use_4addr = params->use_4addr;
694 
695 	if (!err) {
696 		dev->priv_flags &= ~IFF_DONT_BRIDGE;
697 		switch (ntype) {
698 		case NL80211_IFTYPE_STATION:
699 			if (dev->ieee80211_ptr->use_4addr)
700 				break;
701 			/* fall through */
702 		case NL80211_IFTYPE_ADHOC:
703 			dev->priv_flags |= IFF_DONT_BRIDGE;
704 			break;
705 		case NL80211_IFTYPE_AP:
706 		case NL80211_IFTYPE_AP_VLAN:
707 		case NL80211_IFTYPE_WDS:
708 		case NL80211_IFTYPE_MESH_POINT:
709 			/* bridging OK */
710 			break;
711 		case NL80211_IFTYPE_MONITOR:
712 			/* monitor can't bridge anyway */
713 			break;
714 		case NL80211_IFTYPE_UNSPECIFIED:
715 		case __NL80211_IFTYPE_AFTER_LAST:
716 			/* not happening */
717 			break;
718 		}
719 	}
720 
721 	return err;
722 }
723