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proc: task_state: deuglify the max_fds calculation
[linux/fpc-iii.git] / net / wireless / util.c
blob5e233a577d0fcd15e39b5eebc5678598c37637df
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_ctl(fc)) {
312 /*
313 * ACK and CTS are 10 bytes, all others 16. To see how
314 * to get this condition consider
315 * subtype mask: 0b0000000011110000 (0x00F0)
316 * ACK subtype: 0b0000000011010000 (0x00D0)
317 * CTS subtype: 0b0000000011000000 (0x00C0)
318 * bits that matter: ^^^ (0x00E0)
319 * value of those: 0b0000000011000000 (0x00C0)
320 */
321 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
322 hdrlen = 10;
323 else
324 hdrlen = 16;
325 }
326 out:
327 return hdrlen;
328 }
329 EXPORT_SYMBOL(ieee80211_hdrlen);
330
331 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
332 {
333 const struct ieee80211_hdr *hdr =
334 (const struct ieee80211_hdr *)skb->data;
335 unsigned int hdrlen;
336
337 if (unlikely(skb->len < 10))
338 return 0;
339 hdrlen = ieee80211_hdrlen(hdr->frame_control);
340 if (unlikely(hdrlen > skb->len))
341 return 0;
342 return hdrlen;
343 }
344 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
345
346 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
347 {
348 int ae = meshhdr->flags & MESH_FLAGS_AE;
349 /* 802.11-2012, 8.2.4.7.3 */
350 switch (ae) {
351 default:
352 case 0:
353 return 6;
354 case MESH_FLAGS_AE_A4:
355 return 12;
356 case MESH_FLAGS_AE_A5_A6:
357 return 18;
358 }
359 }
360 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
361
362 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
363 enum nl80211_iftype iftype)
364 {
365 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
366 u16 hdrlen, ethertype;
367 u8 *payload;
368 u8 dst[ETH_ALEN];
369 u8 src[ETH_ALEN] __aligned(2);
370
371 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
372 return -1;
373
374 hdrlen = ieee80211_hdrlen(hdr->frame_control);
375
376 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
377 * header
378 * IEEE 802.11 address fields:
379 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
380 * 0 0 DA SA BSSID n/a
381 * 0 1 DA BSSID SA n/a
382 * 1 0 BSSID SA DA n/a
383 * 1 1 RA TA DA SA
384 */
385 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
386 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
387
388 switch (hdr->frame_control &
389 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
390 case cpu_to_le16(IEEE80211_FCTL_TODS):
391 if (unlikely(iftype != NL80211_IFTYPE_AP &&
392 iftype != NL80211_IFTYPE_AP_VLAN &&
393 iftype != NL80211_IFTYPE_P2P_GO))
394 return -1;
395 break;
396 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
397 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
398 iftype != NL80211_IFTYPE_MESH_POINT &&
399 iftype != NL80211_IFTYPE_AP_VLAN &&
400 iftype != NL80211_IFTYPE_STATION))
401 return -1;
402 if (iftype == NL80211_IFTYPE_MESH_POINT) {
403 struct ieee80211s_hdr *meshdr =
404 (struct ieee80211s_hdr *) (skb->data + hdrlen);
405 /* make sure meshdr->flags is on the linear part */
406 if (!pskb_may_pull(skb, hdrlen + 1))
407 return -1;
408 if (meshdr->flags & MESH_FLAGS_AE_A4)
409 return -1;
410 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
411 skb_copy_bits(skb, hdrlen +
412 offsetof(struct ieee80211s_hdr, eaddr1),
413 dst, ETH_ALEN);
414 skb_copy_bits(skb, hdrlen +
415 offsetof(struct ieee80211s_hdr, eaddr2),
416 src, ETH_ALEN);
417 }
418 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
419 }
420 break;
421 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
422 if ((iftype != NL80211_IFTYPE_STATION &&
423 iftype != NL80211_IFTYPE_P2P_CLIENT &&
424 iftype != NL80211_IFTYPE_MESH_POINT) ||
425 (is_multicast_ether_addr(dst) &&
426 ether_addr_equal(src, addr)))
427 return -1;
428 if (iftype == NL80211_IFTYPE_MESH_POINT) {
429 struct ieee80211s_hdr *meshdr =
430 (struct ieee80211s_hdr *) (skb->data + hdrlen);
431 /* make sure meshdr->flags is on the linear part */
432 if (!pskb_may_pull(skb, hdrlen + 1))
433 return -1;
434 if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
435 return -1;
436 if (meshdr->flags & MESH_FLAGS_AE_A4)
437 skb_copy_bits(skb, hdrlen +
438 offsetof(struct ieee80211s_hdr, eaddr1),
439 src, ETH_ALEN);
440 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
441 }
442 break;
443 case cpu_to_le16(0):
444 if (iftype != NL80211_IFTYPE_ADHOC &&
445 iftype != NL80211_IFTYPE_STATION)
446 return -1;
447 break;
448 }
449
450 if (!pskb_may_pull(skb, hdrlen + 8))
451 return -1;
452
453 payload = skb->data + hdrlen;
454 ethertype = (payload[6] << 8) | payload[7];
455
456 if (likely((ether_addr_equal(payload, rfc1042_header) &&
457 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
458 ether_addr_equal(payload, bridge_tunnel_header))) {
459 /* remove RFC1042 or Bridge-Tunnel encapsulation and
460 * replace EtherType */
461 skb_pull(skb, hdrlen + 6);
462 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
463 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
464 } else {
465 struct ethhdr *ehdr;
466 __be16 len;
467
468 skb_pull(skb, hdrlen);
469 len = htons(skb->len);
470 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
471 memcpy(ehdr->h_dest, dst, ETH_ALEN);
472 memcpy(ehdr->h_source, src, ETH_ALEN);
473 ehdr->h_proto = len;
474 }
475 return 0;
476 }
477 EXPORT_SYMBOL(ieee80211_data_to_8023);
478
479 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
480 enum nl80211_iftype iftype,
481 const u8 *bssid, bool qos)
482 {
483 struct ieee80211_hdr hdr;
484 u16 hdrlen, ethertype;
485 __le16 fc;
486 const u8 *encaps_data;
487 int encaps_len, skip_header_bytes;
488 int nh_pos, h_pos;
489 int head_need;
490
491 if (unlikely(skb->len < ETH_HLEN))
492 return -EINVAL;
493
494 nh_pos = skb_network_header(skb) - skb->data;
495 h_pos = skb_transport_header(skb) - skb->data;
496
497 /* convert Ethernet header to proper 802.11 header (based on
498 * operation mode) */
499 ethertype = (skb->data[12] << 8) | skb->data[13];
500 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
501
502 switch (iftype) {
503 case NL80211_IFTYPE_AP:
504 case NL80211_IFTYPE_AP_VLAN:
505 case NL80211_IFTYPE_P2P_GO:
506 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
507 /* DA BSSID SA */
508 memcpy(hdr.addr1, skb->data, ETH_ALEN);
509 memcpy(hdr.addr2, addr, ETH_ALEN);
510 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
511 hdrlen = 24;
512 break;
513 case NL80211_IFTYPE_STATION:
514 case NL80211_IFTYPE_P2P_CLIENT:
515 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
516 /* BSSID SA DA */
517 memcpy(hdr.addr1, bssid, ETH_ALEN);
518 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
519 memcpy(hdr.addr3, skb->data, ETH_ALEN);
520 hdrlen = 24;
521 break;
522 case NL80211_IFTYPE_ADHOC:
523 /* DA SA BSSID */
524 memcpy(hdr.addr1, skb->data, ETH_ALEN);
525 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
526 memcpy(hdr.addr3, bssid, ETH_ALEN);
527 hdrlen = 24;
528 break;
529 default:
530 return -EOPNOTSUPP;
531 }
532
533 if (qos) {
534 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
535 hdrlen += 2;
536 }
537
538 hdr.frame_control = fc;
539 hdr.duration_id = 0;
540 hdr.seq_ctrl = 0;
541
542 skip_header_bytes = ETH_HLEN;
543 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
544 encaps_data = bridge_tunnel_header;
545 encaps_len = sizeof(bridge_tunnel_header);
546 skip_header_bytes -= 2;
547 } else if (ethertype >= ETH_P_802_3_MIN) {
548 encaps_data = rfc1042_header;
549 encaps_len = sizeof(rfc1042_header);
550 skip_header_bytes -= 2;
551 } else {
552 encaps_data = NULL;
553 encaps_len = 0;
554 }
555
556 skb_pull(skb, skip_header_bytes);
557 nh_pos -= skip_header_bytes;
558 h_pos -= skip_header_bytes;
559
560 head_need = hdrlen + encaps_len - skb_headroom(skb);
561
562 if (head_need > 0 || skb_cloned(skb)) {
563 head_need = max(head_need, 0);
564 if (head_need)
565 skb_orphan(skb);
566
567 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
568 return -ENOMEM;
569
570 skb->truesize += head_need;
571 }
572
573 if (encaps_data) {
574 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
575 nh_pos += encaps_len;
576 h_pos += encaps_len;
577 }
578
579 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
580
581 nh_pos += hdrlen;
582 h_pos += hdrlen;
583
584 /* Update skb pointers to various headers since this modified frame
585 * is going to go through Linux networking code that may potentially
586 * need things like pointer to IP header. */
587 skb_set_mac_header(skb, 0);
588 skb_set_network_header(skb, nh_pos);
589 skb_set_transport_header(skb, h_pos);
590
591 return 0;
592 }
593 EXPORT_SYMBOL(ieee80211_data_from_8023);
594
595
596 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
597 const u8 *addr, enum nl80211_iftype iftype,
598 const unsigned int extra_headroom,
599 bool has_80211_header)
600 {
601 struct sk_buff *frame = NULL;
602 u16 ethertype;
603 u8 *payload;
604 const struct ethhdr *eth;
605 int remaining, err;
606 u8 dst[ETH_ALEN], src[ETH_ALEN];
607
608 if (has_80211_header) {
609 err = ieee80211_data_to_8023(skb, addr, iftype);
610 if (err)
611 goto out;
612
613 /* skip the wrapping header */
614 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
615 if (!eth)
616 goto out;
617 } else {
618 eth = (struct ethhdr *) skb->data;
619 }
620
621 while (skb != frame) {
622 u8 padding;
623 __be16 len = eth->h_proto;
624 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
625
626 remaining = skb->len;
627 memcpy(dst, eth->h_dest, ETH_ALEN);
628 memcpy(src, eth->h_source, ETH_ALEN);
629
630 padding = (4 - subframe_len) & 0x3;
631 /* the last MSDU has no padding */
632 if (subframe_len > remaining)
633 goto purge;
634
635 skb_pull(skb, sizeof(struct ethhdr));
636 /* reuse skb for the last subframe */
637 if (remaining <= subframe_len + padding)
638 frame = skb;
639 else {
640 unsigned int hlen = ALIGN(extra_headroom, 4);
641 /*
642 * Allocate and reserve two bytes more for payload
643 * alignment since sizeof(struct ethhdr) is 14.
644 */
645 frame = dev_alloc_skb(hlen + subframe_len + 2);
646 if (!frame)
647 goto purge;
648
649 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
650 memcpy(skb_put(frame, ntohs(len)), skb->data,
651 ntohs(len));
652
653 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
654 padding);
655 if (!eth) {
656 dev_kfree_skb(frame);
657 goto purge;
658 }
659 }
660
661 skb_reset_network_header(frame);
662 frame->dev = skb->dev;
663 frame->priority = skb->priority;
664
665 payload = frame->data;
666 ethertype = (payload[6] << 8) | payload[7];
667
668 if (likely((ether_addr_equal(payload, rfc1042_header) &&
669 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
670 ether_addr_equal(payload, bridge_tunnel_header))) {
671 /* remove RFC1042 or Bridge-Tunnel
672 * encapsulation and replace EtherType */
673 skb_pull(frame, 6);
674 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
675 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
676 } else {
677 memcpy(skb_push(frame, sizeof(__be16)), &len,
678 sizeof(__be16));
679 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
680 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
681 }
682 __skb_queue_tail(list, frame);
683 }
684
685 return;
686
687 purge:
688 __skb_queue_purge(list);
689 out:
690 dev_kfree_skb(skb);
691 }
692 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
693
694 /* Given a data frame determine the 802.1p/1d tag to use. */
695 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
696 struct cfg80211_qos_map *qos_map)
697 {
698 unsigned int dscp;
699 unsigned char vlan_priority;
700
701 /* skb->priority values from 256->263 are magic values to
702 * directly indicate a specific 802.1d priority. This is used
703 * to allow 802.1d priority to be passed directly in from VLAN
704 * tags, etc.
705 */
706 if (skb->priority >= 256 && skb->priority <= 263)
707 return skb->priority - 256;
708
709 if (vlan_tx_tag_present(skb)) {
710 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
711 >> VLAN_PRIO_SHIFT;
712 if (vlan_priority > 0)
713 return vlan_priority;
714 }
715
716 switch (skb->protocol) {
717 case htons(ETH_P_IP):
718 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
719 break;
720 case htons(ETH_P_IPV6):
721 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
722 break;
723 case htons(ETH_P_MPLS_UC):
724 case htons(ETH_P_MPLS_MC): {
725 struct mpls_label mpls_tmp, *mpls;
726
727 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
728 sizeof(*mpls), &mpls_tmp);
729 if (!mpls)
730 return 0;
731
732 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
733 >> MPLS_LS_TC_SHIFT;
734 }
735 case htons(ETH_P_80221):
736 /* 802.21 is always network control traffic */
737 return 7;
738 default:
739 return 0;
740 }
741
742 if (qos_map) {
743 unsigned int i, tmp_dscp = dscp >> 2;
744
745 for (i = 0; i < qos_map->num_des; i++) {
746 if (tmp_dscp == qos_map->dscp_exception[i].dscp)
747 return qos_map->dscp_exception[i].up;
748 }
749
750 for (i = 0; i < 8; i++) {
751 if (tmp_dscp >= qos_map->up[i].low &&
752 tmp_dscp <= qos_map->up[i].high)
753 return i;
754 }
755 }
756
757 return dscp >> 5;
758 }
759 EXPORT_SYMBOL(cfg80211_classify8021d);
760
761 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
762 {
763 const struct cfg80211_bss_ies *ies;
764
765 ies = rcu_dereference(bss->ies);
766 if (!ies)
767 return NULL;
768
769 return cfg80211_find_ie(ie, ies->data, ies->len);
770 }
771 EXPORT_SYMBOL(ieee80211_bss_get_ie);
772
773 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
774 {
775 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
776 struct net_device *dev = wdev->netdev;
777 int i;
778
779 if (!wdev->connect_keys)
780 return;
781
782 for (i = 0; i < 6; i++) {
783 if (!wdev->connect_keys->params[i].cipher)
784 continue;
785 if (rdev_add_key(rdev, dev, i, false, NULL,
786 &wdev->connect_keys->params[i])) {
787 netdev_err(dev, "failed to set key %d\n", i);
788 continue;
789 }
790 if (wdev->connect_keys->def == i)
791 if (rdev_set_default_key(rdev, dev, i, true, true)) {
792 netdev_err(dev, "failed to set defkey %d\n", i);
793 continue;
794 }
795 if (wdev->connect_keys->defmgmt == i)
796 if (rdev_set_default_mgmt_key(rdev, dev, i))
797 netdev_err(dev, "failed to set mgtdef %d\n", i);
798 }
799
800 kzfree(wdev->connect_keys);
801 wdev->connect_keys = NULL;
802 }
803
804 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
805 {
806 struct cfg80211_event *ev;
807 unsigned long flags;
808 const u8 *bssid = NULL;
809
810 spin_lock_irqsave(&wdev->event_lock, flags);
811 while (!list_empty(&wdev->event_list)) {
812 ev = list_first_entry(&wdev->event_list,
813 struct cfg80211_event, list);
814 list_del(&ev->list);
815 spin_unlock_irqrestore(&wdev->event_lock, flags);
816
817 wdev_lock(wdev);
818 switch (ev->type) {
819 case EVENT_CONNECT_RESULT:
820 if (!is_zero_ether_addr(ev->cr.bssid))
821 bssid = ev->cr.bssid;
822 __cfg80211_connect_result(
823 wdev->netdev, bssid,
824 ev->cr.req_ie, ev->cr.req_ie_len,
825 ev->cr.resp_ie, ev->cr.resp_ie_len,
826 ev->cr.status,
827 ev->cr.status == WLAN_STATUS_SUCCESS,
828 NULL);
829 break;
830 case EVENT_ROAMED:
831 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
832 ev->rm.req_ie_len, ev->rm.resp_ie,
833 ev->rm.resp_ie_len);
834 break;
835 case EVENT_DISCONNECTED:
836 __cfg80211_disconnected(wdev->netdev,
837 ev->dc.ie, ev->dc.ie_len,
838 ev->dc.reason, true);
839 break;
840 case EVENT_IBSS_JOINED:
841 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
842 ev->ij.channel);
843 break;
844 case EVENT_STOPPED:
845 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
846 break;
847 }
848 wdev_unlock(wdev);
849
850 kfree(ev);
851
852 spin_lock_irqsave(&wdev->event_lock, flags);
853 }
854 spin_unlock_irqrestore(&wdev->event_lock, flags);
855 }
856
857 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
858 {
859 struct wireless_dev *wdev;
860
861 ASSERT_RTNL();
862
863 list_for_each_entry(wdev, &rdev->wdev_list, list)
864 cfg80211_process_wdev_events(wdev);
865 }
866
867 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
868 struct net_device *dev, enum nl80211_iftype ntype,
869 u32 *flags, struct vif_params *params)
870 {
871 int err;
872 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
873
874 ASSERT_RTNL();
875
876 /* don't support changing VLANs, you just re-create them */
877 if (otype == NL80211_IFTYPE_AP_VLAN)
878 return -EOPNOTSUPP;
879
880 /* cannot change into P2P device type */
881 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
882 return -EOPNOTSUPP;
883
884 if (!rdev->ops->change_virtual_intf ||
885 !(rdev->wiphy.interface_modes & (1 << ntype)))
886 return -EOPNOTSUPP;
887
888 /* if it's part of a bridge, reject changing type to station/ibss */
889 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
890 (ntype == NL80211_IFTYPE_ADHOC ||
891 ntype == NL80211_IFTYPE_STATION ||
892 ntype == NL80211_IFTYPE_P2P_CLIENT))
893 return -EBUSY;
894
895 if (ntype != otype && netif_running(dev)) {
896 dev->ieee80211_ptr->use_4addr = false;
897 dev->ieee80211_ptr->mesh_id_up_len = 0;
898 wdev_lock(dev->ieee80211_ptr);
899 rdev_set_qos_map(rdev, dev, NULL);
900 wdev_unlock(dev->ieee80211_ptr);
901
902 switch (otype) {
903 case NL80211_IFTYPE_AP:
904 cfg80211_stop_ap(rdev, dev, true);
905 break;
906 case NL80211_IFTYPE_ADHOC:
907 cfg80211_leave_ibss(rdev, dev, false);
908 break;
909 case NL80211_IFTYPE_STATION:
910 case NL80211_IFTYPE_P2P_CLIENT:
911 wdev_lock(dev->ieee80211_ptr);
912 cfg80211_disconnect(rdev, dev,
913 WLAN_REASON_DEAUTH_LEAVING, true);
914 wdev_unlock(dev->ieee80211_ptr);
915 break;
916 case NL80211_IFTYPE_MESH_POINT:
917 /* mesh should be handled? */
918 break;
919 default:
920 break;
921 }
922
923 cfg80211_process_rdev_events(rdev);
924 }
925
926 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
927
928 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
929
930 if (!err && params && params->use_4addr != -1)
931 dev->ieee80211_ptr->use_4addr = params->use_4addr;
932
933 if (!err) {
934 dev->priv_flags &= ~IFF_DONT_BRIDGE;
935 switch (ntype) {
936 case NL80211_IFTYPE_STATION:
937 if (dev->ieee80211_ptr->use_4addr)
938 break;
939 /* fall through */
940 case NL80211_IFTYPE_P2P_CLIENT:
941 case NL80211_IFTYPE_ADHOC:
942 dev->priv_flags |= IFF_DONT_BRIDGE;
943 break;
944 case NL80211_IFTYPE_P2P_GO:
945 case NL80211_IFTYPE_AP:
946 case NL80211_IFTYPE_AP_VLAN:
947 case NL80211_IFTYPE_WDS:
948 case NL80211_IFTYPE_MESH_POINT:
949 /* bridging OK */
950 break;
951 case NL80211_IFTYPE_MONITOR:
952 /* monitor can't bridge anyway */
953 break;
954 case NL80211_IFTYPE_UNSPECIFIED:
955 case NUM_NL80211_IFTYPES:
956 /* not happening */
957 break;
958 case NL80211_IFTYPE_P2P_DEVICE:
959 WARN_ON(1);
960 break;
961 }
962 }
963
964 if (!err && ntype != otype && netif_running(dev)) {
965 cfg80211_update_iface_num(rdev, ntype, 1);
966 cfg80211_update_iface_num(rdev, otype, -1);
967 }
968
969 return err;
970 }
971
972 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
973 {
974 static const u32 __mcs2bitrate[] = {
975 /* control PHY */
976 [0] = 275,
977 /* SC PHY */
978 [1] = 3850,
979 [2] = 7700,
980 [3] = 9625,
981 [4] = 11550,
982 [5] = 12512, /* 1251.25 mbps */
983 [6] = 15400,
984 [7] = 19250,
985 [8] = 23100,
986 [9] = 25025,
987 [10] = 30800,
988 [11] = 38500,
989 [12] = 46200,
990 /* OFDM PHY */
991 [13] = 6930,
992 [14] = 8662, /* 866.25 mbps */
993 [15] = 13860,
994 [16] = 17325,
995 [17] = 20790,
996 [18] = 27720,
997 [19] = 34650,
998 [20] = 41580,
999 [21] = 45045,
1000 [22] = 51975,
1001 [23] = 62370,
1002 [24] = 67568, /* 6756.75 mbps */
1003 /* LP-SC PHY */
1004 [25] = 6260,
1005 [26] = 8340,
1006 [27] = 11120,
1007 [28] = 12510,
1008 [29] = 16680,
1009 [30] = 22240,
1010 [31] = 25030,
1011 };
1012
1013 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1014 return 0;
1015
1016 return __mcs2bitrate[rate->mcs];
1017 }
1018
1019 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1020 {
1021 static const u32 base[4][10] = {
1022 { 6500000,
1023 13000000,
1024 19500000,
1025 26000000,
1026 39000000,
1027 52000000,
1028 58500000,
1029 65000000,
1030 78000000,
1031 0,
1032 },
1033 { 13500000,
1034 27000000,
1035 40500000,
1036 54000000,
1037 81000000,
1038 108000000,
1039 121500000,
1040 135000000,
1041 162000000,
1042 180000000,
1043 },
1044 { 29300000,
1045 58500000,
1046 87800000,
1047 117000000,
1048 175500000,
1049 234000000,
1050 263300000,
1051 292500000,
1052 351000000,
1053 390000000,
1054 },
1055 { 58500000,
1056 117000000,
1057 175500000,
1058 234000000,
1059 351000000,
1060 468000000,
1061 526500000,
1062 585000000,
1063 702000000,
1064 780000000,
1065 },
1066 };
1067 u32 bitrate;
1068 int idx;
1069
1070 if (WARN_ON_ONCE(rate->mcs > 9))
1071 return 0;
1072
1073 idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1074 RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1075 rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1076 rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1077
1078 bitrate = base[idx][rate->mcs];
1079 bitrate *= rate->nss;
1080
1081 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1082 bitrate = (bitrate / 9) * 10;
1083
1084 /* do NOT round down here */
1085 return (bitrate + 50000) / 100000;
1086 }
1087
1088 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1089 {
1090 int modulation, streams, bitrate;
1091
1092 if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1093 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1094 return rate->legacy;
1095 if (rate->flags & RATE_INFO_FLAGS_60G)
1096 return cfg80211_calculate_bitrate_60g(rate);
1097 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1098 return cfg80211_calculate_bitrate_vht(rate);
1099
1100 /* the formula below does only work for MCS values smaller than 32 */
1101 if (WARN_ON_ONCE(rate->mcs >= 32))
1102 return 0;
1103
1104 modulation = rate->mcs & 7;
1105 streams = (rate->mcs >> 3) + 1;
1106
1107 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1108 13500000 : 6500000;
1109
1110 if (modulation < 4)
1111 bitrate *= (modulation + 1);
1112 else if (modulation == 4)
1113 bitrate *= (modulation + 2);
1114 else
1115 bitrate *= (modulation + 3);
1116
1117 bitrate *= streams;
1118
1119 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1120 bitrate = (bitrate / 9) * 10;
1121
1122 /* do NOT round down here */
1123 return (bitrate + 50000) / 100000;
1124 }
1125 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1126
1127 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1128 enum ieee80211_p2p_attr_id attr,
1129 u8 *buf, unsigned int bufsize)
1130 {
1131 u8 *out = buf;
1132 u16 attr_remaining = 0;
1133 bool desired_attr = false;
1134 u16 desired_len = 0;
1135
1136 while (len > 0) {
1137 unsigned int iedatalen;
1138 unsigned int copy;
1139 const u8 *iedata;
1140
1141 if (len < 2)
1142 return -EILSEQ;
1143 iedatalen = ies[1];
1144 if (iedatalen + 2 > len)
1145 return -EILSEQ;
1146
1147 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1148 goto cont;
1149
1150 if (iedatalen < 4)
1151 goto cont;
1152
1153 iedata = ies + 2;
1154
1155 /* check WFA OUI, P2P subtype */
1156 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1157 iedata[2] != 0x9a || iedata[3] != 0x09)
1158 goto cont;
1159
1160 iedatalen -= 4;
1161 iedata += 4;
1162
1163 /* check attribute continuation into this IE */
1164 copy = min_t(unsigned int, attr_remaining, iedatalen);
1165 if (copy && desired_attr) {
1166 desired_len += copy;
1167 if (out) {
1168 memcpy(out, iedata, min(bufsize, copy));
1169 out += min(bufsize, copy);
1170 bufsize -= min(bufsize, copy);
1171 }
1172
1173
1174 if (copy == attr_remaining)
1175 return desired_len;
1176 }
1177
1178 attr_remaining -= copy;
1179 if (attr_remaining)
1180 goto cont;
1181
1182 iedatalen -= copy;
1183 iedata += copy;
1184
1185 while (iedatalen > 0) {
1186 u16 attr_len;
1187
1188 /* P2P attribute ID & size must fit */
1189 if (iedatalen < 3)
1190 return -EILSEQ;
1191 desired_attr = iedata[0] == attr;
1192 attr_len = get_unaligned_le16(iedata + 1);
1193 iedatalen -= 3;
1194 iedata += 3;
1195
1196 copy = min_t(unsigned int, attr_len, iedatalen);
1197
1198 if (desired_attr) {
1199 desired_len += copy;
1200 if (out) {
1201 memcpy(out, iedata, min(bufsize, copy));
1202 out += min(bufsize, copy);
1203 bufsize -= min(bufsize, copy);
1204 }
1205
1206 if (copy == attr_len)
1207 return desired_len;
1208 }
1209
1210 iedata += copy;
1211 iedatalen -= copy;
1212 attr_remaining = attr_len - copy;
1213 }
1214
1215 cont:
1216 len -= ies[1] + 2;
1217 ies += ies[1] + 2;
1218 }
1219
1220 if (attr_remaining && desired_attr)
1221 return -EILSEQ;
1222
1223 return -ENOENT;
1224 }
1225 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1226
1227 bool ieee80211_operating_class_to_band(u8 operating_class,
1228 enum ieee80211_band *band)
1229 {
1230 switch (operating_class) {
1231 case 112:
1232 case 115 ... 127:
1233 *band = IEEE80211_BAND_5GHZ;
1234 return true;
1235 case 81:
1236 case 82:
1237 case 83:
1238 case 84:
1239 *band = IEEE80211_BAND_2GHZ;
1240 return true;
1241 case 180:
1242 *band = IEEE80211_BAND_60GHZ;
1243 return true;
1244 }
1245
1246 return false;
1247 }
1248 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1249
1250 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1251 u32 beacon_int)
1252 {
1253 struct wireless_dev *wdev;
1254 int res = 0;
1255
1256 if (!beacon_int)
1257 return -EINVAL;
1258
1259 list_for_each_entry(wdev, &rdev->wdev_list, list) {
1260 if (!wdev->beacon_interval)
1261 continue;
1262 if (wdev->beacon_interval != beacon_int) {
1263 res = -EINVAL;
1264 break;
1265 }
1266 }
1267
1268 return res;
1269 }
1270
1271 int cfg80211_iter_combinations(struct wiphy *wiphy,
1272 const int num_different_channels,
1273 const u8 radar_detect,
1274 const int iftype_num[NUM_NL80211_IFTYPES],
1275 void (*iter)(const struct ieee80211_iface_combination *c,
1276 void *data),
1277 void *data)
1278 {
1279 const struct ieee80211_regdomain *regdom;
1280 enum nl80211_dfs_regions region = 0;
1281 int i, j, iftype;
1282 int num_interfaces = 0;
1283 u32 used_iftypes = 0;
1284
1285 if (radar_detect) {
1286 rcu_read_lock();
1287 regdom = rcu_dereference(cfg80211_regdomain);
1288 if (regdom)
1289 region = regdom->dfs_region;
1290 rcu_read_unlock();
1291 }
1292
1293 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1294 num_interfaces += iftype_num[iftype];
1295 if (iftype_num[iftype] > 0 &&
1296 !(wiphy->software_iftypes & BIT(iftype)))
1297 used_iftypes |= BIT(iftype);
1298 }
1299
1300 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1301 const struct ieee80211_iface_combination *c;
1302 struct ieee80211_iface_limit *limits;
1303 u32 all_iftypes = 0;
1304
1305 c = &wiphy->iface_combinations[i];
1306
1307 if (num_interfaces > c->max_interfaces)
1308 continue;
1309 if (num_different_channels > c->num_different_channels)
1310 continue;
1311
1312 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1313 GFP_KERNEL);
1314 if (!limits)
1315 return -ENOMEM;
1316
1317 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1318 if (wiphy->software_iftypes & BIT(iftype))
1319 continue;
1320 for (j = 0; j < c->n_limits; j++) {
1321 all_iftypes |= limits[j].types;
1322 if (!(limits[j].types & BIT(iftype)))
1323 continue;
1324 if (limits[j].max < iftype_num[iftype])
1325 goto cont;
1326 limits[j].max -= iftype_num[iftype];
1327 }
1328 }
1329
1330 if (radar_detect != (c->radar_detect_widths & radar_detect))
1331 goto cont;
1332
1333 if (radar_detect && c->radar_detect_regions &&
1334 !(c->radar_detect_regions & BIT(region)))
1335 goto cont;
1336
1337 /* Finally check that all iftypes that we're currently
1338 * using are actually part of this combination. If they
1339 * aren't then we can't use this combination and have
1340 * to continue to the next.
1341 */
1342 if ((all_iftypes & used_iftypes) != used_iftypes)
1343 goto cont;
1344
1345 /* This combination covered all interface types and
1346 * supported the requested numbers, so we're good.
1347 */
1348
1349 (*iter)(c, data);
1350 cont:
1351 kfree(limits);
1352 }
1353
1354 return 0;
1355 }
1356 EXPORT_SYMBOL(cfg80211_iter_combinations);
1357
1358 static void
1359 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1360 void *data)
1361 {
1362 int *num = data;
1363 (*num)++;
1364 }
1365
1366 int cfg80211_check_combinations(struct wiphy *wiphy,
1367 const int num_different_channels,
1368 const u8 radar_detect,
1369 const int iftype_num[NUM_NL80211_IFTYPES])
1370 {
1371 int err, num = 0;
1372
1373 err = cfg80211_iter_combinations(wiphy, num_different_channels,
1374 radar_detect, iftype_num,
1375 cfg80211_iter_sum_ifcombs, &num);
1376 if (err)
1377 return err;
1378 if (num == 0)
1379 return -EBUSY;
1380
1381 return 0;
1382 }
1383 EXPORT_SYMBOL(cfg80211_check_combinations);
1384
1385 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1386 struct wireless_dev *wdev,
1387 enum nl80211_iftype iftype,
1388 struct ieee80211_channel *chan,
1389 enum cfg80211_chan_mode chanmode,
1390 u8 radar_detect)
1391 {
1392 struct wireless_dev *wdev_iter;
1393 int num[NUM_NL80211_IFTYPES];
1394 struct ieee80211_channel
1395 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1396 struct ieee80211_channel *ch;
1397 enum cfg80211_chan_mode chmode;
1398 int num_different_channels = 0;
1399 int total = 1;
1400 int i;
1401
1402 ASSERT_RTNL();
1403
1404 if (WARN_ON(hweight32(radar_detect) > 1))
1405 return -EINVAL;
1406
1407 if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1408 return -EINVAL;
1409
1410 /* Always allow software iftypes */
1411 if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1412 if (radar_detect)
1413 return -EINVAL;
1414 return 0;
1415 }
1416
1417 memset(num, 0, sizeof(num));
1418 memset(used_channels, 0, sizeof(used_channels));
1419
1420 num[iftype] = 1;
1421
1422 /* TODO: We'll probably not need this anymore, since this
1423 * should only be called with CHAN_MODE_UNDEFINED. There are
1424 * still a couple of pending calls where other chanmodes are
1425 * used, but we should get rid of them.
1426 */
1427 switch (chanmode) {
1428 case CHAN_MODE_UNDEFINED:
1429 break;
1430 case CHAN_MODE_SHARED:
1431 WARN_ON(!chan);
1432 used_channels[0] = chan;
1433 num_different_channels++;
1434 break;
1435 case CHAN_MODE_EXCLUSIVE:
1436 num_different_channels++;
1437 break;
1438 }
1439
1440 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1441 if (wdev_iter == wdev)
1442 continue;
1443 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1444 if (!wdev_iter->p2p_started)
1445 continue;
1446 } else if (wdev_iter->netdev) {
1447 if (!netif_running(wdev_iter->netdev))
1448 continue;
1449 } else {
1450 WARN_ON(1);
1451 }
1452
1453 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1454 continue;
1455
1456 /*
1457 * We may be holding the "wdev" mutex, but now need to lock
1458 * wdev_iter. This is OK because once we get here wdev_iter
1459 * is not wdev (tested above), but we need to use the nested
1460 * locking for lockdep.
1461 */
1462 mutex_lock_nested(&wdev_iter->mtx, 1);
1463 __acquire(wdev_iter->mtx);
1464 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1465 wdev_unlock(wdev_iter);
1466
1467 switch (chmode) {
1468 case CHAN_MODE_UNDEFINED:
1469 break;
1470 case CHAN_MODE_SHARED:
1471 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1472 if (!used_channels[i] || used_channels[i] == ch)
1473 break;
1474
1475 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1476 return -EBUSY;
1477
1478 if (used_channels[i] == NULL) {
1479 used_channels[i] = ch;
1480 num_different_channels++;
1481 }
1482 break;
1483 case CHAN_MODE_EXCLUSIVE:
1484 num_different_channels++;
1485 break;
1486 }
1487
1488 num[wdev_iter->iftype]++;
1489 total++;
1490 }
1491
1492 if (total == 1 && !radar_detect)
1493 return 0;
1494
1495 return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
1496 radar_detect, num);
1497 }
1498
1499 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1500 const u8 *rates, unsigned int n_rates,
1501 u32 *mask)
1502 {
1503 int i, j;
1504
1505 if (!sband)
1506 return -EINVAL;
1507
1508 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1509 return -EINVAL;
1510
1511 *mask = 0;
1512
1513 for (i = 0; i < n_rates; i++) {
1514 int rate = (rates[i] & 0x7f) * 5;
1515 bool found = false;
1516
1517 for (j = 0; j < sband->n_bitrates; j++) {
1518 if (sband->bitrates[j].bitrate == rate) {
1519 found = true;
1520 *mask |= BIT(j);
1521 break;
1522 }
1523 }
1524 if (!found)
1525 return -EINVAL;
1526 }
1527
1528 /*
1529 * mask must have at least one bit set here since we
1530 * didn't accept a 0-length rates array nor allowed
1531 * entries in the array that didn't exist
1532 */
1533
1534 return 0;
1535 }
1536
1537 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1538 {
1539 enum ieee80211_band band;
1540 unsigned int n_channels = 0;
1541
1542 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1543 if (wiphy->bands[band])
1544 n_channels += wiphy->bands[band]->n_channels;
1545
1546 return n_channels;
1547 }
1548 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1549
1550 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1551 struct station_info *sinfo)
1552 {
1553 struct cfg80211_registered_device *rdev;
1554 struct wireless_dev *wdev;
1555
1556 wdev = dev->ieee80211_ptr;
1557 if (!wdev)
1558 return -EOPNOTSUPP;
1559
1560 rdev = wiphy_to_rdev(wdev->wiphy);
1561 if (!rdev->ops->get_station)
1562 return -EOPNOTSUPP;
1563
1564 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1565 }
1566 EXPORT_SYMBOL(cfg80211_get_station);
1567
1568 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1569 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1570 const unsigned char rfc1042_header[] __aligned(2) =
1571 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1572 EXPORT_SYMBOL(rfc1042_header);
1573
1574 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1575 const unsigned char bridge_tunnel_header[] __aligned(2) =
1576 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1577 EXPORT_SYMBOL(bridge_tunnel_header);
Linux with added FPC-III support