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Merge branch 'acpi-ec'
[mirror_ubuntu-bionic-kernel.git] / net / wireless / util.c
1 /*
2 * Wireless utility functions
3 *
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
6 */
7 #include <linux/export.h>
8 #include <linux/bitops.h>
9 #include <linux/etherdevice.h>
10 #include <linux/slab.h>
11 #include <net/cfg80211.h>
12 #include <net/ip.h>
13 #include <net/dsfield.h>
14 #include <linux/if_vlan.h>
15 #include <linux/mpls.h>
16 #include "core.h"
17 #include "rdev-ops.h"
18
19
20 struct ieee80211_rate *
21 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
22 u32 basic_rates, int bitrate)
23 {
24 struct ieee80211_rate *result = &sband->bitrates[0];
25 int i;
26
27 for (i = 0; i < sband->n_bitrates; i++) {
28 if (!(basic_rates & BIT(i)))
29 continue;
30 if (sband->bitrates[i].bitrate > bitrate)
31 continue;
32 result = &sband->bitrates[i];
33 }
34
35 return result;
36 }
37 EXPORT_SYMBOL(ieee80211_get_response_rate);
38
39 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
40 enum nl80211_bss_scan_width scan_width)
41 {
42 struct ieee80211_rate *bitrates;
43 u32 mandatory_rates = 0;
44 enum ieee80211_rate_flags mandatory_flag;
45 int i;
46
47 if (WARN_ON(!sband))
48 return 1;
49
50 if (sband->band == IEEE80211_BAND_2GHZ) {
51 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
52 scan_width == NL80211_BSS_CHAN_WIDTH_10)
53 mandatory_flag = IEEE80211_RATE_MANDATORY_G;
54 else
55 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
56 } else {
57 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
58 }
59
60 bitrates = sband->bitrates;
61 for (i = 0; i < sband->n_bitrates; i++)
62 if (bitrates[i].flags & mandatory_flag)
63 mandatory_rates |= BIT(i);
64 return mandatory_rates;
65 }
66 EXPORT_SYMBOL(ieee80211_mandatory_rates);
67
68 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
69 {
70 /* see 802.11 17.3.8.3.2 and Annex J
71 * there are overlapping channel numbers in 5GHz and 2GHz bands */
72 if (chan <= 0)
73 return 0; /* not supported */
74 switch (band) {
75 case IEEE80211_BAND_2GHZ:
76 if (chan == 14)
77 return 2484;
78 else if (chan < 14)
79 return 2407 + chan * 5;
80 break;
81 case IEEE80211_BAND_5GHZ:
82 if (chan >= 182 && chan <= 196)
83 return 4000 + chan * 5;
84 else
85 return 5000 + chan * 5;
86 break;
87 case IEEE80211_BAND_60GHZ:
88 if (chan < 5)
89 return 56160 + chan * 2160;
90 break;
91 default:
92 ;
93 }
94 return 0; /* not supported */
95 }
96 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
97
98 int ieee80211_frequency_to_channel(int freq)
99 {
100 /* see 802.11 17.3.8.3.2 and Annex J */
101 if (freq == 2484)
102 return 14;
103 else if (freq < 2484)
104 return (freq - 2407) / 5;
105 else if (freq >= 4910 && freq <= 4980)
106 return (freq - 4000) / 5;
107 else if (freq <= 45000) /* DMG band lower limit */
108 return (freq - 5000) / 5;
109 else if (freq >= 58320 && freq <= 64800)
110 return (freq - 56160) / 2160;
111 else
112 return 0;
113 }
114 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
115
116 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
117 int freq)
118 {
119 enum ieee80211_band band;
120 struct ieee80211_supported_band *sband;
121 int i;
122
123 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
124 sband = wiphy->bands[band];
125
126 if (!sband)
127 continue;
128
129 for (i = 0; i < sband->n_channels; i++) {
130 if (sband->channels[i].center_freq == freq)
131 return &sband->channels[i];
132 }
133 }
134
135 return NULL;
136 }
137 EXPORT_SYMBOL(__ieee80211_get_channel);
138
139 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
140 enum ieee80211_band band)
141 {
142 int i, want;
143
144 switch (band) {
145 case IEEE80211_BAND_5GHZ:
146 want = 3;
147 for (i = 0; i < sband->n_bitrates; i++) {
148 if (sband->bitrates[i].bitrate == 60 ||
149 sband->bitrates[i].bitrate == 120 ||
150 sband->bitrates[i].bitrate == 240) {
151 sband->bitrates[i].flags |=
152 IEEE80211_RATE_MANDATORY_A;
153 want--;
154 }
155 }
156 WARN_ON(want);
157 break;
158 case IEEE80211_BAND_2GHZ:
159 want = 7;
160 for (i = 0; i < sband->n_bitrates; i++) {
161 if (sband->bitrates[i].bitrate == 10) {
162 sband->bitrates[i].flags |=
163 IEEE80211_RATE_MANDATORY_B |
164 IEEE80211_RATE_MANDATORY_G;
165 want--;
166 }
167
168 if (sband->bitrates[i].bitrate == 20 ||
169 sband->bitrates[i].bitrate == 55 ||
170 sband->bitrates[i].bitrate == 110 ||
171 sband->bitrates[i].bitrate == 60 ||
172 sband->bitrates[i].bitrate == 120 ||
173 sband->bitrates[i].bitrate == 240) {
174 sband->bitrates[i].flags |=
175 IEEE80211_RATE_MANDATORY_G;
176 want--;
177 }
178
179 if (sband->bitrates[i].bitrate != 10 &&
180 sband->bitrates[i].bitrate != 20 &&
181 sband->bitrates[i].bitrate != 55 &&
182 sband->bitrates[i].bitrate != 110)
183 sband->bitrates[i].flags |=
184 IEEE80211_RATE_ERP_G;
185 }
186 WARN_ON(want != 0 && want != 3 && want != 6);
187 break;
188 case IEEE80211_BAND_60GHZ:
189 /* check for mandatory HT MCS 1..4 */
190 WARN_ON(!sband->ht_cap.ht_supported);
191 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
192 break;
193 case IEEE80211_NUM_BANDS:
194 WARN_ON(1);
195 break;
196 }
197 }
198
199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
200 {
201 enum ieee80211_band band;
202
203 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
204 if (wiphy->bands[band])
205 set_mandatory_flags_band(wiphy->bands[band], band);
206 }
207
208 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
209 {
210 int i;
211 for (i = 0; i < wiphy->n_cipher_suites; i++)
212 if (cipher == wiphy->cipher_suites[i])
213 return true;
214 return false;
215 }
216
217 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
218 struct key_params *params, int key_idx,
219 bool pairwise, const u8 *mac_addr)
220 {
221 if (key_idx > 5)
222 return -EINVAL;
223
224 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
225 return -EINVAL;
226
227 if (pairwise && !mac_addr)
228 return -EINVAL;
229
230 /*
231 * Disallow pairwise keys with non-zero index unless it's WEP
232 * or a vendor specific cipher (because current deployments use
233 * pairwise WEP keys with non-zero indices and for vendor specific
234 * ciphers this should be validated in the driver or hardware level
235 * - but 802.11i clearly specifies to use zero)
236 */
237 if (pairwise && key_idx &&
238 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
239 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
240 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
241 return -EINVAL;
242
243 switch (params->cipher) {
244 case WLAN_CIPHER_SUITE_WEP40:
245 if (params->key_len != WLAN_KEY_LEN_WEP40)
246 return -EINVAL;
247 break;
248 case WLAN_CIPHER_SUITE_TKIP:
249 if (params->key_len != WLAN_KEY_LEN_TKIP)
250 return -EINVAL;
251 break;
252 case WLAN_CIPHER_SUITE_CCMP:
253 if (params->key_len != WLAN_KEY_LEN_CCMP)
254 return -EINVAL;
255 break;
256 case WLAN_CIPHER_SUITE_WEP104:
257 if (params->key_len != WLAN_KEY_LEN_WEP104)
258 return -EINVAL;
259 break;
260 case WLAN_CIPHER_SUITE_AES_CMAC:
261 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
262 return -EINVAL;
263 break;
264 default:
265 /*
266 * We don't know anything about this algorithm,
267 * allow using it -- but the driver must check
268 * all parameters! We still check below whether
269 * or not the driver supports this algorithm,
270 * of course.
271 */
272 break;
273 }
274
275 if (params->seq) {
276 switch (params->cipher) {
277 case WLAN_CIPHER_SUITE_WEP40:
278 case WLAN_CIPHER_SUITE_WEP104:
279 /* These ciphers do not use key sequence */
280 return -EINVAL;
281 case WLAN_CIPHER_SUITE_TKIP:
282 case WLAN_CIPHER_SUITE_CCMP:
283 case WLAN_CIPHER_SUITE_AES_CMAC:
284 if (params->seq_len != 6)
285 return -EINVAL;
286 break;
287 }
288 }
289
290 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
291 return -EINVAL;
292
293 return 0;
294 }
295
296 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
297 {
298 unsigned int hdrlen = 24;
299
300 if (ieee80211_is_data(fc)) {
301 if (ieee80211_has_a4(fc))
302 hdrlen = 30;
303 if (ieee80211_is_data_qos(fc)) {
304 hdrlen += IEEE80211_QOS_CTL_LEN;
305 if (ieee80211_has_order(fc))
306 hdrlen += IEEE80211_HT_CTL_LEN;
307 }
308 goto out;
309 }
310
311 if (ieee80211_is_mgmt(fc)) {
312 if (ieee80211_has_order(fc))
313 hdrlen += IEEE80211_HT_CTL_LEN;
314 goto out;
315 }
316
317 if (ieee80211_is_ctl(fc)) {
318 /*
319 * ACK and CTS are 10 bytes, all others 16. To see how
320 * to get this condition consider
321 * subtype mask: 0b0000000011110000 (0x00F0)
322 * ACK subtype: 0b0000000011010000 (0x00D0)
323 * CTS subtype: 0b0000000011000000 (0x00C0)
324 * bits that matter: ^^^ (0x00E0)
325 * value of those: 0b0000000011000000 (0x00C0)
326 */
327 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
328 hdrlen = 10;
329 else
330 hdrlen = 16;
331 }
332 out:
333 return hdrlen;
334 }
335 EXPORT_SYMBOL(ieee80211_hdrlen);
336
337 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
338 {
339 const struct ieee80211_hdr *hdr =
340 (const struct ieee80211_hdr *)skb->data;
341 unsigned int hdrlen;
342
343 if (unlikely(skb->len < 10))
344 return 0;
345 hdrlen = ieee80211_hdrlen(hdr->frame_control);
346 if (unlikely(hdrlen > skb->len))
347 return 0;
348 return hdrlen;
349 }
350 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
351
352 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
353 {
354 int ae = meshhdr->flags & MESH_FLAGS_AE;
355 /* 802.11-2012, 8.2.4.7.3 */
356 switch (ae) {
357 default:
358 case 0:
359 return 6;
360 case MESH_FLAGS_AE_A4:
361 return 12;
362 case MESH_FLAGS_AE_A5_A6:
363 return 18;
364 }
365 }
366 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
367
368 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
369 enum nl80211_iftype iftype)
370 {
371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
372 u16 hdrlen, ethertype;
373 u8 *payload;
374 u8 dst[ETH_ALEN];
375 u8 src[ETH_ALEN] __aligned(2);
376
377 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
378 return -1;
379
380 hdrlen = ieee80211_hdrlen(hdr->frame_control);
381
382 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
383 * header
384 * IEEE 802.11 address fields:
385 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
386 * 0 0 DA SA BSSID n/a
387 * 0 1 DA BSSID SA n/a
388 * 1 0 BSSID SA DA n/a
389 * 1 1 RA TA DA SA
390 */
391 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
392 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
393
394 switch (hdr->frame_control &
395 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
396 case cpu_to_le16(IEEE80211_FCTL_TODS):
397 if (unlikely(iftype != NL80211_IFTYPE_AP &&
398 iftype != NL80211_IFTYPE_AP_VLAN &&
399 iftype != NL80211_IFTYPE_P2P_GO))
400 return -1;
401 break;
402 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
403 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
404 iftype != NL80211_IFTYPE_MESH_POINT &&
405 iftype != NL80211_IFTYPE_AP_VLAN &&
406 iftype != NL80211_IFTYPE_STATION))
407 return -1;
408 if (iftype == NL80211_IFTYPE_MESH_POINT) {
409 struct ieee80211s_hdr *meshdr =
410 (struct ieee80211s_hdr *) (skb->data + hdrlen);
411 /* make sure meshdr->flags is on the linear part */
412 if (!pskb_may_pull(skb, hdrlen + 1))
413 return -1;
414 if (meshdr->flags & MESH_FLAGS_AE_A4)
415 return -1;
416 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
417 skb_copy_bits(skb, hdrlen +
418 offsetof(struct ieee80211s_hdr, eaddr1),
419 dst, ETH_ALEN);
420 skb_copy_bits(skb, hdrlen +
421 offsetof(struct ieee80211s_hdr, eaddr2),
422 src, ETH_ALEN);
423 }
424 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
425 }
426 break;
427 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
428 if ((iftype != NL80211_IFTYPE_STATION &&
429 iftype != NL80211_IFTYPE_P2P_CLIENT &&
430 iftype != NL80211_IFTYPE_MESH_POINT) ||
431 (is_multicast_ether_addr(dst) &&
432 ether_addr_equal(src, addr)))
433 return -1;
434 if (iftype == NL80211_IFTYPE_MESH_POINT) {
435 struct ieee80211s_hdr *meshdr =
436 (struct ieee80211s_hdr *) (skb->data + hdrlen);
437 /* make sure meshdr->flags is on the linear part */
438 if (!pskb_may_pull(skb, hdrlen + 1))
439 return -1;
440 if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
441 return -1;
442 if (meshdr->flags & MESH_FLAGS_AE_A4)
443 skb_copy_bits(skb, hdrlen +
444 offsetof(struct ieee80211s_hdr, eaddr1),
445 src, ETH_ALEN);
446 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
447 }
448 break;
449 case cpu_to_le16(0):
450 if (iftype != NL80211_IFTYPE_ADHOC &&
451 iftype != NL80211_IFTYPE_STATION &&
452 iftype != NL80211_IFTYPE_OCB)
453 return -1;
454 break;
455 }
456
457 if (!pskb_may_pull(skb, hdrlen + 8))
458 return -1;
459
460 payload = skb->data + hdrlen;
461 ethertype = (payload[6] << 8) | payload[7];
462
463 if (likely((ether_addr_equal(payload, rfc1042_header) &&
464 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
465 ether_addr_equal(payload, bridge_tunnel_header))) {
466 /* remove RFC1042 or Bridge-Tunnel encapsulation and
467 * replace EtherType */
468 skb_pull(skb, hdrlen + 6);
469 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
470 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
471 } else {
472 struct ethhdr *ehdr;
473 __be16 len;
474
475 skb_pull(skb, hdrlen);
476 len = htons(skb->len);
477 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
478 memcpy(ehdr->h_dest, dst, ETH_ALEN);
479 memcpy(ehdr->h_source, src, ETH_ALEN);
480 ehdr->h_proto = len;
481 }
482 return 0;
483 }
484 EXPORT_SYMBOL(ieee80211_data_to_8023);
485
486 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
487 enum nl80211_iftype iftype,
488 const u8 *bssid, bool qos)
489 {
490 struct ieee80211_hdr hdr;
491 u16 hdrlen, ethertype;
492 __le16 fc;
493 const u8 *encaps_data;
494 int encaps_len, skip_header_bytes;
495 int nh_pos, h_pos;
496 int head_need;
497
498 if (unlikely(skb->len < ETH_HLEN))
499 return -EINVAL;
500
501 nh_pos = skb_network_header(skb) - skb->data;
502 h_pos = skb_transport_header(skb) - skb->data;
503
504 /* convert Ethernet header to proper 802.11 header (based on
505 * operation mode) */
506 ethertype = (skb->data[12] << 8) | skb->data[13];
507 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
508
509 switch (iftype) {
510 case NL80211_IFTYPE_AP:
511 case NL80211_IFTYPE_AP_VLAN:
512 case NL80211_IFTYPE_P2P_GO:
513 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
514 /* DA BSSID SA */
515 memcpy(hdr.addr1, skb->data, ETH_ALEN);
516 memcpy(hdr.addr2, addr, ETH_ALEN);
517 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
518 hdrlen = 24;
519 break;
520 case NL80211_IFTYPE_STATION:
521 case NL80211_IFTYPE_P2P_CLIENT:
522 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
523 /* BSSID SA DA */
524 memcpy(hdr.addr1, bssid, ETH_ALEN);
525 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
526 memcpy(hdr.addr3, skb->data, ETH_ALEN);
527 hdrlen = 24;
528 break;
529 case NL80211_IFTYPE_OCB:
530 case NL80211_IFTYPE_ADHOC:
531 /* DA SA BSSID */
532 memcpy(hdr.addr1, skb->data, ETH_ALEN);
533 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
534 memcpy(hdr.addr3, bssid, ETH_ALEN);
535 hdrlen = 24;
536 break;
537 default:
538 return -EOPNOTSUPP;
539 }
540
541 if (qos) {
542 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
543 hdrlen += 2;
544 }
545
546 hdr.frame_control = fc;
547 hdr.duration_id = 0;
548 hdr.seq_ctrl = 0;
549
550 skip_header_bytes = ETH_HLEN;
551 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
552 encaps_data = bridge_tunnel_header;
553 encaps_len = sizeof(bridge_tunnel_header);
554 skip_header_bytes -= 2;
555 } else if (ethertype >= ETH_P_802_3_MIN) {
556 encaps_data = rfc1042_header;
557 encaps_len = sizeof(rfc1042_header);
558 skip_header_bytes -= 2;
559 } else {
560 encaps_data = NULL;
561 encaps_len = 0;
562 }
563
564 skb_pull(skb, skip_header_bytes);
565 nh_pos -= skip_header_bytes;
566 h_pos -= skip_header_bytes;
567
568 head_need = hdrlen + encaps_len - skb_headroom(skb);
569
570 if (head_need > 0 || skb_cloned(skb)) {
571 head_need = max(head_need, 0);
572 if (head_need)
573 skb_orphan(skb);
574
575 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
576 return -ENOMEM;
577
578 skb->truesize += head_need;
579 }
580
581 if (encaps_data) {
582 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
583 nh_pos += encaps_len;
584 h_pos += encaps_len;
585 }
586
587 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
588
589 nh_pos += hdrlen;
590 h_pos += hdrlen;
591
592 /* Update skb pointers to various headers since this modified frame
593 * is going to go through Linux networking code that may potentially
594 * need things like pointer to IP header. */
595 skb_set_mac_header(skb, 0);
596 skb_set_network_header(skb, nh_pos);
597 skb_set_transport_header(skb, h_pos);
598
599 return 0;
600 }
601 EXPORT_SYMBOL(ieee80211_data_from_8023);
602
603
604 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
605 const u8 *addr, enum nl80211_iftype iftype,
606 const unsigned int extra_headroom,
607 bool has_80211_header)
608 {
609 struct sk_buff *frame = NULL;
610 u16 ethertype;
611 u8 *payload;
612 const struct ethhdr *eth;
613 int remaining, err;
614 u8 dst[ETH_ALEN], src[ETH_ALEN];
615
616 if (has_80211_header) {
617 err = ieee80211_data_to_8023(skb, addr, iftype);
618 if (err)
619 goto out;
620
621 /* skip the wrapping header */
622 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
623 if (!eth)
624 goto out;
625 } else {
626 eth = (struct ethhdr *) skb->data;
627 }
628
629 while (skb != frame) {
630 u8 padding;
631 __be16 len = eth->h_proto;
632 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
633
634 remaining = skb->len;
635 memcpy(dst, eth->h_dest, ETH_ALEN);
636 memcpy(src, eth->h_source, ETH_ALEN);
637
638 padding = (4 - subframe_len) & 0x3;
639 /* the last MSDU has no padding */
640 if (subframe_len > remaining)
641 goto purge;
642
643 skb_pull(skb, sizeof(struct ethhdr));
644 /* reuse skb for the last subframe */
645 if (remaining <= subframe_len + padding)
646 frame = skb;
647 else {
648 unsigned int hlen = ALIGN(extra_headroom, 4);
649 /*
650 * Allocate and reserve two bytes more for payload
651 * alignment since sizeof(struct ethhdr) is 14.
652 */
653 frame = dev_alloc_skb(hlen + subframe_len + 2);
654 if (!frame)
655 goto purge;
656
657 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
658 memcpy(skb_put(frame, ntohs(len)), skb->data,
659 ntohs(len));
660
661 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
662 padding);
663 if (!eth) {
664 dev_kfree_skb(frame);
665 goto purge;
666 }
667 }
668
669 skb_reset_network_header(frame);
670 frame->dev = skb->dev;
671 frame->priority = skb->priority;
672
673 payload = frame->data;
674 ethertype = (payload[6] << 8) | payload[7];
675
676 if (likely((ether_addr_equal(payload, rfc1042_header) &&
677 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
678 ether_addr_equal(payload, bridge_tunnel_header))) {
679 /* remove RFC1042 or Bridge-Tunnel
680 * encapsulation and replace EtherType */
681 skb_pull(frame, 6);
682 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
683 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
684 } else {
685 memcpy(skb_push(frame, sizeof(__be16)), &len,
686 sizeof(__be16));
687 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
688 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
689 }
690 __skb_queue_tail(list, frame);
691 }
692
693 return;
694
695 purge:
696 __skb_queue_purge(list);
697 out:
698 dev_kfree_skb(skb);
699 }
700 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
701
702 /* Given a data frame determine the 802.1p/1d tag to use. */
703 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
704 struct cfg80211_qos_map *qos_map)
705 {
706 unsigned int dscp;
707 unsigned char vlan_priority;
708
709 /* skb->priority values from 256->263 are magic values to
710 * directly indicate a specific 802.1d priority. This is used
711 * to allow 802.1d priority to be passed directly in from VLAN
712 * tags, etc.
713 */
714 if (skb->priority >= 256 && skb->priority <= 263)
715 return skb->priority - 256;
716
717 if (vlan_tx_tag_present(skb)) {
718 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
719 >> VLAN_PRIO_SHIFT;
720 if (vlan_priority > 0)
721 return vlan_priority;
722 }
723
724 switch (skb->protocol) {
725 case htons(ETH_P_IP):
726 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
727 break;
728 case htons(ETH_P_IPV6):
729 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
730 break;
731 case htons(ETH_P_MPLS_UC):
732 case htons(ETH_P_MPLS_MC): {
733 struct mpls_label mpls_tmp, *mpls;
734
735 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
736 sizeof(*mpls), &mpls_tmp);
737 if (!mpls)
738 return 0;
739
740 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
741 >> MPLS_LS_TC_SHIFT;
742 }
743 case htons(ETH_P_80221):
744 /* 802.21 is always network control traffic */
745 return 7;
746 default:
747 return 0;
748 }
749
750 if (qos_map) {
751 unsigned int i, tmp_dscp = dscp >> 2;
752
753 for (i = 0; i < qos_map->num_des; i++) {
754 if (tmp_dscp == qos_map->dscp_exception[i].dscp)
755 return qos_map->dscp_exception[i].up;
756 }
757
758 for (i = 0; i < 8; i++) {
759 if (tmp_dscp >= qos_map->up[i].low &&
760 tmp_dscp <= qos_map->up[i].high)
761 return i;
762 }
763 }
764
765 return dscp >> 5;
766 }
767 EXPORT_SYMBOL(cfg80211_classify8021d);
768
769 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
770 {
771 const struct cfg80211_bss_ies *ies;
772
773 ies = rcu_dereference(bss->ies);
774 if (!ies)
775 return NULL;
776
777 return cfg80211_find_ie(ie, ies->data, ies->len);
778 }
779 EXPORT_SYMBOL(ieee80211_bss_get_ie);
780
781 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
782 {
783 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
784 struct net_device *dev = wdev->netdev;
785 int i;
786
787 if (!wdev->connect_keys)
788 return;
789
790 for (i = 0; i < 6; i++) {
791 if (!wdev->connect_keys->params[i].cipher)
792 continue;
793 if (rdev_add_key(rdev, dev, i, false, NULL,
794 &wdev->connect_keys->params[i])) {
795 netdev_err(dev, "failed to set key %d\n", i);
796 continue;
797 }
798 if (wdev->connect_keys->def == i)
799 if (rdev_set_default_key(rdev, dev, i, true, true)) {
800 netdev_err(dev, "failed to set defkey %d\n", i);
801 continue;
802 }
803 if (wdev->connect_keys->defmgmt == i)
804 if (rdev_set_default_mgmt_key(rdev, dev, i))
805 netdev_err(dev, "failed to set mgtdef %d\n", i);
806 }
807
808 kzfree(wdev->connect_keys);
809 wdev->connect_keys = NULL;
810 }
811
812 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
813 {
814 struct cfg80211_event *ev;
815 unsigned long flags;
816 const u8 *bssid = NULL;
817
818 spin_lock_irqsave(&wdev->event_lock, flags);
819 while (!list_empty(&wdev->event_list)) {
820 ev = list_first_entry(&wdev->event_list,
821 struct cfg80211_event, list);
822 list_del(&ev->list);
823 spin_unlock_irqrestore(&wdev->event_lock, flags);
824
825 wdev_lock(wdev);
826 switch (ev->type) {
827 case EVENT_CONNECT_RESULT:
828 if (!is_zero_ether_addr(ev->cr.bssid))
829 bssid = ev->cr.bssid;
830 __cfg80211_connect_result(
831 wdev->netdev, bssid,
832 ev->cr.req_ie, ev->cr.req_ie_len,
833 ev->cr.resp_ie, ev->cr.resp_ie_len,
834 ev->cr.status,
835 ev->cr.status == WLAN_STATUS_SUCCESS,
836 NULL);
837 break;
838 case EVENT_ROAMED:
839 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
840 ev->rm.req_ie_len, ev->rm.resp_ie,
841 ev->rm.resp_ie_len);
842 break;
843 case EVENT_DISCONNECTED:
844 __cfg80211_disconnected(wdev->netdev,
845 ev->dc.ie, ev->dc.ie_len,
846 ev->dc.reason, true);
847 break;
848 case EVENT_IBSS_JOINED:
849 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
850 ev->ij.channel);
851 break;
852 case EVENT_STOPPED:
853 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
854 break;
855 }
856 wdev_unlock(wdev);
857
858 kfree(ev);
859
860 spin_lock_irqsave(&wdev->event_lock, flags);
861 }
862 spin_unlock_irqrestore(&wdev->event_lock, flags);
863 }
864
865 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
866 {
867 struct wireless_dev *wdev;
868
869 ASSERT_RTNL();
870
871 list_for_each_entry(wdev, &rdev->wdev_list, list)
872 cfg80211_process_wdev_events(wdev);
873 }
874
875 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
876 struct net_device *dev, enum nl80211_iftype ntype,
877 u32 *flags, struct vif_params *params)
878 {
879 int err;
880 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
881
882 ASSERT_RTNL();
883
884 /* don't support changing VLANs, you just re-create them */
885 if (otype == NL80211_IFTYPE_AP_VLAN)
886 return -EOPNOTSUPP;
887
888 /* cannot change into P2P device type */
889 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
890 return -EOPNOTSUPP;
891
892 if (!rdev->ops->change_virtual_intf ||
893 !(rdev->wiphy.interface_modes & (1 << ntype)))
894 return -EOPNOTSUPP;
895
896 /* if it's part of a bridge, reject changing type to station/ibss */
897 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
898 (ntype == NL80211_IFTYPE_ADHOC ||
899 ntype == NL80211_IFTYPE_STATION ||
900 ntype == NL80211_IFTYPE_P2P_CLIENT))
901 return -EBUSY;
902
903 if (ntype != otype && netif_running(dev)) {
904 dev->ieee80211_ptr->use_4addr = false;
905 dev->ieee80211_ptr->mesh_id_up_len = 0;
906 wdev_lock(dev->ieee80211_ptr);
907 rdev_set_qos_map(rdev, dev, NULL);
908 wdev_unlock(dev->ieee80211_ptr);
909
910 switch (otype) {
911 case NL80211_IFTYPE_AP:
912 cfg80211_stop_ap(rdev, dev, true);
913 break;
914 case NL80211_IFTYPE_ADHOC:
915 cfg80211_leave_ibss(rdev, dev, false);
916 break;
917 case NL80211_IFTYPE_STATION:
918 case NL80211_IFTYPE_P2P_CLIENT:
919 wdev_lock(dev->ieee80211_ptr);
920 cfg80211_disconnect(rdev, dev,
921 WLAN_REASON_DEAUTH_LEAVING, true);
922 wdev_unlock(dev->ieee80211_ptr);
923 break;
924 case NL80211_IFTYPE_MESH_POINT:
925 /* mesh should be handled? */
926 break;
927 default:
928 break;
929 }
930
931 cfg80211_process_rdev_events(rdev);
932 }
933
934 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
935
936 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
937
938 if (!err && params && params->use_4addr != -1)
939 dev->ieee80211_ptr->use_4addr = params->use_4addr;
940
941 if (!err) {
942 dev->priv_flags &= ~IFF_DONT_BRIDGE;
943 switch (ntype) {
944 case NL80211_IFTYPE_STATION:
945 if (dev->ieee80211_ptr->use_4addr)
946 break;
947 /* fall through */
948 case NL80211_IFTYPE_OCB:
949 case NL80211_IFTYPE_P2P_CLIENT:
950 case NL80211_IFTYPE_ADHOC:
951 dev->priv_flags |= IFF_DONT_BRIDGE;
952 break;
953 case NL80211_IFTYPE_P2P_GO:
954 case NL80211_IFTYPE_AP:
955 case NL80211_IFTYPE_AP_VLAN:
956 case NL80211_IFTYPE_WDS:
957 case NL80211_IFTYPE_MESH_POINT:
958 /* bridging OK */
959 break;
960 case NL80211_IFTYPE_MONITOR:
961 /* monitor can't bridge anyway */
962 break;
963 case NL80211_IFTYPE_UNSPECIFIED:
964 case NUM_NL80211_IFTYPES:
965 /* not happening */
966 break;
967 case NL80211_IFTYPE_P2P_DEVICE:
968 WARN_ON(1);
969 break;
970 }
971 }
972
973 if (!err && ntype != otype && netif_running(dev)) {
974 cfg80211_update_iface_num(rdev, ntype, 1);
975 cfg80211_update_iface_num(rdev, otype, -1);
976 }
977
978 return err;
979 }
980
981 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
982 {
983 static const u32 __mcs2bitrate[] = {
984 /* control PHY */
985 [0] = 275,
986 /* SC PHY */
987 [1] = 3850,
988 [2] = 7700,
989 [3] = 9625,
990 [4] = 11550,
991 [5] = 12512, /* 1251.25 mbps */
992 [6] = 15400,
993 [7] = 19250,
994 [8] = 23100,
995 [9] = 25025,
996 [10] = 30800,
997 [11] = 38500,
998 [12] = 46200,
999 /* OFDM PHY */
1000 [13] = 6930,
1001 [14] = 8662, /* 866.25 mbps */
1002 [15] = 13860,
1003 [16] = 17325,
1004 [17] = 20790,
1005 [18] = 27720,
1006 [19] = 34650,
1007 [20] = 41580,
1008 [21] = 45045,
1009 [22] = 51975,
1010 [23] = 62370,
1011 [24] = 67568, /* 6756.75 mbps */
1012 /* LP-SC PHY */
1013 [25] = 6260,
1014 [26] = 8340,
1015 [27] = 11120,
1016 [28] = 12510,
1017 [29] = 16680,
1018 [30] = 22240,
1019 [31] = 25030,
1020 };
1021
1022 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1023 return 0;
1024
1025 return __mcs2bitrate[rate->mcs];
1026 }
1027
1028 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1029 {
1030 static const u32 base[4][10] = {
1031 { 6500000,
1032 13000000,
1033 19500000,
1034 26000000,
1035 39000000,
1036 52000000,
1037 58500000,
1038 65000000,
1039 78000000,
1040 0,
1041 },
1042 { 13500000,
1043 27000000,
1044 40500000,
1045 54000000,
1046 81000000,
1047 108000000,
1048 121500000,
1049 135000000,
1050 162000000,
1051 180000000,
1052 },
1053 { 29300000,
1054 58500000,
1055 87800000,
1056 117000000,
1057 175500000,
1058 234000000,
1059 263300000,
1060 292500000,
1061 351000000,
1062 390000000,
1063 },
1064 { 58500000,
1065 117000000,
1066 175500000,
1067 234000000,
1068 351000000,
1069 468000000,
1070 526500000,
1071 585000000,
1072 702000000,
1073 780000000,
1074 },
1075 };
1076 u32 bitrate;
1077 int idx;
1078
1079 if (WARN_ON_ONCE(rate->mcs > 9))
1080 return 0;
1081
1082 idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1083 RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1084 rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1085 rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1086
1087 bitrate = base[idx][rate->mcs];
1088 bitrate *= rate->nss;
1089
1090 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1091 bitrate = (bitrate / 9) * 10;
1092
1093 /* do NOT round down here */
1094 return (bitrate + 50000) / 100000;
1095 }
1096
1097 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1098 {
1099 int modulation, streams, bitrate;
1100
1101 if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1102 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1103 return rate->legacy;
1104 if (rate->flags & RATE_INFO_FLAGS_60G)
1105 return cfg80211_calculate_bitrate_60g(rate);
1106 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1107 return cfg80211_calculate_bitrate_vht(rate);
1108
1109 /* the formula below does only work for MCS values smaller than 32 */
1110 if (WARN_ON_ONCE(rate->mcs >= 32))
1111 return 0;
1112
1113 modulation = rate->mcs & 7;
1114 streams = (rate->mcs >> 3) + 1;
1115
1116 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1117 13500000 : 6500000;
1118
1119 if (modulation < 4)
1120 bitrate *= (modulation + 1);
1121 else if (modulation == 4)
1122 bitrate *= (modulation + 2);
1123 else
1124 bitrate *= (modulation + 3);
1125
1126 bitrate *= streams;
1127
1128 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1129 bitrate = (bitrate / 9) * 10;
1130
1131 /* do NOT round down here */
1132 return (bitrate + 50000) / 100000;
1133 }
1134 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1135
1136 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1137 enum ieee80211_p2p_attr_id attr,
1138 u8 *buf, unsigned int bufsize)
1139 {
1140 u8 *out = buf;
1141 u16 attr_remaining = 0;
1142 bool desired_attr = false;
1143 u16 desired_len = 0;
1144
1145 while (len > 0) {
1146 unsigned int iedatalen;
1147 unsigned int copy;
1148 const u8 *iedata;
1149
1150 if (len < 2)
1151 return -EILSEQ;
1152 iedatalen = ies[1];
1153 if (iedatalen + 2 > len)
1154 return -EILSEQ;
1155
1156 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1157 goto cont;
1158
1159 if (iedatalen < 4)
1160 goto cont;
1161
1162 iedata = ies + 2;
1163
1164 /* check WFA OUI, P2P subtype */
1165 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1166 iedata[2] != 0x9a || iedata[3] != 0x09)
1167 goto cont;
1168
1169 iedatalen -= 4;
1170 iedata += 4;
1171
1172 /* check attribute continuation into this IE */
1173 copy = min_t(unsigned int, attr_remaining, iedatalen);
1174 if (copy && desired_attr) {
1175 desired_len += copy;
1176 if (out) {
1177 memcpy(out, iedata, min(bufsize, copy));
1178 out += min(bufsize, copy);
1179 bufsize -= min(bufsize, copy);
1180 }
1181
1182
1183 if (copy == attr_remaining)
1184 return desired_len;
1185 }
1186
1187 attr_remaining -= copy;
1188 if (attr_remaining)
1189 goto cont;
1190
1191 iedatalen -= copy;
1192 iedata += copy;
1193
1194 while (iedatalen > 0) {
1195 u16 attr_len;
1196
1197 /* P2P attribute ID & size must fit */
1198 if (iedatalen < 3)
1199 return -EILSEQ;
1200 desired_attr = iedata[0] == attr;
1201 attr_len = get_unaligned_le16(iedata + 1);
1202 iedatalen -= 3;
1203 iedata += 3;
1204
1205 copy = min_t(unsigned int, attr_len, iedatalen);
1206
1207 if (desired_attr) {
1208 desired_len += copy;
1209 if (out) {
1210 memcpy(out, iedata, min(bufsize, copy));
1211 out += min(bufsize, copy);
1212 bufsize -= min(bufsize, copy);
1213 }
1214
1215 if (copy == attr_len)
1216 return desired_len;
1217 }
1218
1219 iedata += copy;
1220 iedatalen -= copy;
1221 attr_remaining = attr_len - copy;
1222 }
1223
1224 cont:
1225 len -= ies[1] + 2;
1226 ies += ies[1] + 2;
1227 }
1228
1229 if (attr_remaining && desired_attr)
1230 return -EILSEQ;
1231
1232 return -ENOENT;
1233 }
1234 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1235
1236 bool ieee80211_operating_class_to_band(u8 operating_class,
1237 enum ieee80211_band *band)
1238 {
1239 switch (operating_class) {
1240 case 112:
1241 case 115 ... 127:
1242 *band = IEEE80211_BAND_5GHZ;
1243 return true;
1244 case 81:
1245 case 82:
1246 case 83:
1247 case 84:
1248 *band = IEEE80211_BAND_2GHZ;
1249 return true;
1250 case 180:
1251 *band = IEEE80211_BAND_60GHZ;
1252 return true;
1253 }
1254
1255 return false;
1256 }
1257 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1258
1259 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1260 u32 beacon_int)
1261 {
1262 struct wireless_dev *wdev;
1263 int res = 0;
1264
1265 if (!beacon_int)
1266 return -EINVAL;
1267
1268 list_for_each_entry(wdev, &rdev->wdev_list, list) {
1269 if (!wdev->beacon_interval)
1270 continue;
1271 if (wdev->beacon_interval != beacon_int) {
1272 res = -EINVAL;
1273 break;
1274 }
1275 }
1276
1277 return res;
1278 }
1279
1280 int cfg80211_iter_combinations(struct wiphy *wiphy,
1281 const int num_different_channels,
1282 const u8 radar_detect,
1283 const int iftype_num[NUM_NL80211_IFTYPES],
1284 void (*iter)(const struct ieee80211_iface_combination *c,
1285 void *data),
1286 void *data)
1287 {
1288 const struct ieee80211_regdomain *regdom;
1289 enum nl80211_dfs_regions region = 0;
1290 int i, j, iftype;
1291 int num_interfaces = 0;
1292 u32 used_iftypes = 0;
1293
1294 if (radar_detect) {
1295 rcu_read_lock();
1296 regdom = rcu_dereference(cfg80211_regdomain);
1297 if (regdom)
1298 region = regdom->dfs_region;
1299 rcu_read_unlock();
1300 }
1301
1302 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1303 num_interfaces += iftype_num[iftype];
1304 if (iftype_num[iftype] > 0 &&
1305 !(wiphy->software_iftypes & BIT(iftype)))
1306 used_iftypes |= BIT(iftype);
1307 }
1308
1309 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1310 const struct ieee80211_iface_combination *c;
1311 struct ieee80211_iface_limit *limits;
1312 u32 all_iftypes = 0;
1313
1314 c = &wiphy->iface_combinations[i];
1315
1316 if (num_interfaces > c->max_interfaces)
1317 continue;
1318 if (num_different_channels > c->num_different_channels)
1319 continue;
1320
1321 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1322 GFP_KERNEL);
1323 if (!limits)
1324 return -ENOMEM;
1325
1326 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1327 if (wiphy->software_iftypes & BIT(iftype))
1328 continue;
1329 for (j = 0; j < c->n_limits; j++) {
1330 all_iftypes |= limits[j].types;
1331 if (!(limits[j].types & BIT(iftype)))
1332 continue;
1333 if (limits[j].max < iftype_num[iftype])
1334 goto cont;
1335 limits[j].max -= iftype_num[iftype];
1336 }
1337 }
1338
1339 if (radar_detect != (c->radar_detect_widths & radar_detect))
1340 goto cont;
1341
1342 if (radar_detect && c->radar_detect_regions &&
1343 !(c->radar_detect_regions & BIT(region)))
1344 goto cont;
1345
1346 /* Finally check that all iftypes that we're currently
1347 * using are actually part of this combination. If they
1348 * aren't then we can't use this combination and have
1349 * to continue to the next.
1350 */
1351 if ((all_iftypes & used_iftypes) != used_iftypes)
1352 goto cont;
1353
1354 /* This combination covered all interface types and
1355 * supported the requested numbers, so we're good.
1356 */
1357
1358 (*iter)(c, data);
1359 cont:
1360 kfree(limits);
1361 }
1362
1363 return 0;
1364 }
1365 EXPORT_SYMBOL(cfg80211_iter_combinations);
1366
1367 static void
1368 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1369 void *data)
1370 {
1371 int *num = data;
1372 (*num)++;
1373 }
1374
1375 int cfg80211_check_combinations(struct wiphy *wiphy,
1376 const int num_different_channels,
1377 const u8 radar_detect,
1378 const int iftype_num[NUM_NL80211_IFTYPES])
1379 {
1380 int err, num = 0;
1381
1382 err = cfg80211_iter_combinations(wiphy, num_different_channels,
1383 radar_detect, iftype_num,
1384 cfg80211_iter_sum_ifcombs, &num);
1385 if (err)
1386 return err;
1387 if (num == 0)
1388 return -EBUSY;
1389
1390 return 0;
1391 }
1392 EXPORT_SYMBOL(cfg80211_check_combinations);
1393
1394 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1395 struct wireless_dev *wdev,
1396 enum nl80211_iftype iftype,
1397 struct ieee80211_channel *chan,
1398 enum cfg80211_chan_mode chanmode,
1399 u8 radar_detect)
1400 {
1401 struct wireless_dev *wdev_iter;
1402 int num[NUM_NL80211_IFTYPES];
1403 struct ieee80211_channel
1404 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1405 struct ieee80211_channel *ch;
1406 enum cfg80211_chan_mode chmode;
1407 int num_different_channels = 0;
1408 int total = 1;
1409 int i;
1410
1411 ASSERT_RTNL();
1412
1413 if (WARN_ON(hweight32(radar_detect) > 1))
1414 return -EINVAL;
1415
1416 if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1417 return -EINVAL;
1418
1419 /* Always allow software iftypes */
1420 if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1421 if (radar_detect)
1422 return -EINVAL;
1423 return 0;
1424 }
1425
1426 memset(num, 0, sizeof(num));
1427 memset(used_channels, 0, sizeof(used_channels));
1428
1429 num[iftype] = 1;
1430
1431 /* TODO: We'll probably not need this anymore, since this
1432 * should only be called with CHAN_MODE_UNDEFINED. There are
1433 * still a couple of pending calls where other chanmodes are
1434 * used, but we should get rid of them.
1435 */
1436 switch (chanmode) {
1437 case CHAN_MODE_UNDEFINED:
1438 break;
1439 case CHAN_MODE_SHARED:
1440 WARN_ON(!chan);
1441 used_channels[0] = chan;
1442 num_different_channels++;
1443 break;
1444 case CHAN_MODE_EXCLUSIVE:
1445 num_different_channels++;
1446 break;
1447 }
1448
1449 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1450 if (wdev_iter == wdev)
1451 continue;
1452 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1453 if (!wdev_iter->p2p_started)
1454 continue;
1455 } else if (wdev_iter->netdev) {
1456 if (!netif_running(wdev_iter->netdev))
1457 continue;
1458 } else {
1459 WARN_ON(1);
1460 }
1461
1462 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1463 continue;
1464
1465 /*
1466 * We may be holding the "wdev" mutex, but now need to lock
1467 * wdev_iter. This is OK because once we get here wdev_iter
1468 * is not wdev (tested above), but we need to use the nested
1469 * locking for lockdep.
1470 */
1471 mutex_lock_nested(&wdev_iter->mtx, 1);
1472 __acquire(wdev_iter->mtx);
1473 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1474 wdev_unlock(wdev_iter);
1475
1476 switch (chmode) {
1477 case CHAN_MODE_UNDEFINED:
1478 break;
1479 case CHAN_MODE_SHARED:
1480 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1481 if (!used_channels[i] || used_channels[i] == ch)
1482 break;
1483
1484 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1485 return -EBUSY;
1486
1487 if (used_channels[i] == NULL) {
1488 used_channels[i] = ch;
1489 num_different_channels++;
1490 }
1491 break;
1492 case CHAN_MODE_EXCLUSIVE:
1493 num_different_channels++;
1494 break;
1495 }
1496
1497 num[wdev_iter->iftype]++;
1498 total++;
1499 }
1500
1501 if (total == 1 && !radar_detect)
1502 return 0;
1503
1504 return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
1505 radar_detect, num);
1506 }
1507
1508 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1509 const u8 *rates, unsigned int n_rates,
1510 u32 *mask)
1511 {
1512 int i, j;
1513
1514 if (!sband)
1515 return -EINVAL;
1516
1517 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1518 return -EINVAL;
1519
1520 *mask = 0;
1521
1522 for (i = 0; i < n_rates; i++) {
1523 int rate = (rates[i] & 0x7f) * 5;
1524 bool found = false;
1525
1526 for (j = 0; j < sband->n_bitrates; j++) {
1527 if (sband->bitrates[j].bitrate == rate) {
1528 found = true;
1529 *mask |= BIT(j);
1530 break;
1531 }
1532 }
1533 if (!found)
1534 return -EINVAL;
1535 }
1536
1537 /*
1538 * mask must have at least one bit set here since we
1539 * didn't accept a 0-length rates array nor allowed
1540 * entries in the array that didn't exist
1541 */
1542
1543 return 0;
1544 }
1545
1546 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1547 {
1548 enum ieee80211_band band;
1549 unsigned int n_channels = 0;
1550
1551 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1552 if (wiphy->bands[band])
1553 n_channels += wiphy->bands[band]->n_channels;
1554
1555 return n_channels;
1556 }
1557 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1558
1559 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1560 struct station_info *sinfo)
1561 {
1562 struct cfg80211_registered_device *rdev;
1563 struct wireless_dev *wdev;
1564
1565 wdev = dev->ieee80211_ptr;
1566 if (!wdev)
1567 return -EOPNOTSUPP;
1568
1569 rdev = wiphy_to_rdev(wdev->wiphy);
1570 if (!rdev->ops->get_station)
1571 return -EOPNOTSUPP;
1572
1573 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1574 }
1575 EXPORT_SYMBOL(cfg80211_get_station);
1576
1577 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1578 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1579 const unsigned char rfc1042_header[] __aligned(2) =
1580 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1581 EXPORT_SYMBOL(rfc1042_header);
1582
1583 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1584 const unsigned char bridge_tunnel_header[] __aligned(2) =
1585 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1586 EXPORT_SYMBOL(bridge_tunnel_header);
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