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virtio_ring: Make interrupt suppression spec compliant
[linux/fpc-iii.git] / net / wireless / util.c
blob8edce22d1b9316bf79e99411ffe3ce66e3ae0a6f
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 == NL80211_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 nl80211_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 NL80211_BAND_2GHZ:
76 if (chan == 14)
77 return 2484;
78 else if (chan < 14)
79 return 2407 + chan * 5;
80 break;
81 case NL80211_BAND_5GHZ:
82 if (chan >= 182 && chan <= 196)
83 return 4000 + chan * 5;
84 else
85 return 5000 + chan * 5;
86 break;
87 case NL80211_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 nl80211_band band;
120 struct ieee80211_supported_band *sband;
121 int i;
122
123 for (band = 0; band < NUM_NL80211_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 nl80211_band band)
141 {
142 int i, want;
143
144 switch (band) {
145 case NL80211_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 NL80211_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 NL80211_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 NUM_NL80211_BANDS:
194 WARN_ON(1);
195 break;
196 }
197 }
198
199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
200 {
201 enum nl80211_band band;
202
203 for (band = 0; band < NUM_NL80211_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 < 0 || 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 switch (params->cipher) {
231 case WLAN_CIPHER_SUITE_TKIP:
232 case WLAN_CIPHER_SUITE_CCMP:
233 case WLAN_CIPHER_SUITE_CCMP_256:
234 case WLAN_CIPHER_SUITE_GCMP:
235 case WLAN_CIPHER_SUITE_GCMP_256:
236 /* Disallow pairwise keys with non-zero index unless it's WEP
237 * or a vendor specific cipher (because current deployments use
238 * pairwise WEP keys with non-zero indices and for vendor
239 * specific ciphers this should be validated in the driver or
240 * hardware level - but 802.11i clearly specifies to use zero)
241 */
242 if (pairwise && key_idx)
243 return -EINVAL;
244 break;
245 case WLAN_CIPHER_SUITE_AES_CMAC:
246 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
247 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
248 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
249 /* Disallow BIP (group-only) cipher as pairwise cipher */
250 if (pairwise)
251 return -EINVAL;
252 if (key_idx < 4)
253 return -EINVAL;
254 break;
255 case WLAN_CIPHER_SUITE_WEP40:
256 case WLAN_CIPHER_SUITE_WEP104:
257 if (key_idx > 3)
258 return -EINVAL;
259 default:
260 break;
261 }
262
263 switch (params->cipher) {
264 case WLAN_CIPHER_SUITE_WEP40:
265 if (params->key_len != WLAN_KEY_LEN_WEP40)
266 return -EINVAL;
267 break;
268 case WLAN_CIPHER_SUITE_TKIP:
269 if (params->key_len != WLAN_KEY_LEN_TKIP)
270 return -EINVAL;
271 break;
272 case WLAN_CIPHER_SUITE_CCMP:
273 if (params->key_len != WLAN_KEY_LEN_CCMP)
274 return -EINVAL;
275 break;
276 case WLAN_CIPHER_SUITE_CCMP_256:
277 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
278 return -EINVAL;
279 break;
280 case WLAN_CIPHER_SUITE_GCMP:
281 if (params->key_len != WLAN_KEY_LEN_GCMP)
282 return -EINVAL;
283 break;
284 case WLAN_CIPHER_SUITE_GCMP_256:
285 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
286 return -EINVAL;
287 break;
288 case WLAN_CIPHER_SUITE_WEP104:
289 if (params->key_len != WLAN_KEY_LEN_WEP104)
290 return -EINVAL;
291 break;
292 case WLAN_CIPHER_SUITE_AES_CMAC:
293 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
294 return -EINVAL;
295 break;
296 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
297 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
298 return -EINVAL;
299 break;
300 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
301 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
302 return -EINVAL;
303 break;
304 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
305 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
306 return -EINVAL;
307 break;
308 default:
309 /*
310 * We don't know anything about this algorithm,
311 * allow using it -- but the driver must check
312 * all parameters! We still check below whether
313 * or not the driver supports this algorithm,
314 * of course.
315 */
316 break;
317 }
318
319 if (params->seq) {
320 switch (params->cipher) {
321 case WLAN_CIPHER_SUITE_WEP40:
322 case WLAN_CIPHER_SUITE_WEP104:
323 /* These ciphers do not use key sequence */
324 return -EINVAL;
325 case WLAN_CIPHER_SUITE_TKIP:
326 case WLAN_CIPHER_SUITE_CCMP:
327 case WLAN_CIPHER_SUITE_CCMP_256:
328 case WLAN_CIPHER_SUITE_GCMP:
329 case WLAN_CIPHER_SUITE_GCMP_256:
330 case WLAN_CIPHER_SUITE_AES_CMAC:
331 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
332 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
333 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
334 if (params->seq_len != 6)
335 return -EINVAL;
336 break;
337 }
338 }
339
340 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
341 return -EINVAL;
342
343 return 0;
344 }
345
346 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
347 {
348 unsigned int hdrlen = 24;
349
350 if (ieee80211_is_data(fc)) {
351 if (ieee80211_has_a4(fc))
352 hdrlen = 30;
353 if (ieee80211_is_data_qos(fc)) {
354 hdrlen += IEEE80211_QOS_CTL_LEN;
355 if (ieee80211_has_order(fc))
356 hdrlen += IEEE80211_HT_CTL_LEN;
357 }
358 goto out;
359 }
360
361 if (ieee80211_is_mgmt(fc)) {
362 if (ieee80211_has_order(fc))
363 hdrlen += IEEE80211_HT_CTL_LEN;
364 goto out;
365 }
366
367 if (ieee80211_is_ctl(fc)) {
368 /*
369 * ACK and CTS are 10 bytes, all others 16. To see how
370 * to get this condition consider
371 * subtype mask: 0b0000000011110000 (0x00F0)
372 * ACK subtype: 0b0000000011010000 (0x00D0)
373 * CTS subtype: 0b0000000011000000 (0x00C0)
374 * bits that matter: ^^^ (0x00E0)
375 * value of those: 0b0000000011000000 (0x00C0)
376 */
377 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
378 hdrlen = 10;
379 else
380 hdrlen = 16;
381 }
382 out:
383 return hdrlen;
384 }
385 EXPORT_SYMBOL(ieee80211_hdrlen);
386
387 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
388 {
389 const struct ieee80211_hdr *hdr =
390 (const struct ieee80211_hdr *)skb->data;
391 unsigned int hdrlen;
392
393 if (unlikely(skb->len < 10))
394 return 0;
395 hdrlen = ieee80211_hdrlen(hdr->frame_control);
396 if (unlikely(hdrlen > skb->len))
397 return 0;
398 return hdrlen;
399 }
400 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
401
402 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
403 {
404 int ae = flags & MESH_FLAGS_AE;
405 /* 802.11-2012, 8.2.4.7.3 */
406 switch (ae) {
407 default:
408 case 0:
409 return 6;
410 case MESH_FLAGS_AE_A4:
411 return 12;
412 case MESH_FLAGS_AE_A5_A6:
413 return 18;
414 }
415 }
416
417 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
418 {
419 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
420 }
421 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
422
423 static int __ieee80211_data_to_8023(struct sk_buff *skb, struct ethhdr *ehdr,
424 const u8 *addr, enum nl80211_iftype iftype)
425 {
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
427 struct {
428 u8 hdr[ETH_ALEN] __aligned(2);
429 __be16 proto;
430 } payload;
431 struct ethhdr tmp;
432 u16 hdrlen;
433 u8 mesh_flags = 0;
434
435 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
436 return -1;
437
438 hdrlen = ieee80211_hdrlen(hdr->frame_control);
439 if (skb->len < hdrlen + 8)
440 return -1;
441
442 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
443 * header
444 * IEEE 802.11 address fields:
445 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
446 * 0 0 DA SA BSSID n/a
447 * 0 1 DA BSSID SA n/a
448 * 1 0 BSSID SA DA n/a
449 * 1 1 RA TA DA SA
450 */
451 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
452 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
453
454 if (iftype == NL80211_IFTYPE_MESH_POINT)
455 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
456
457 switch (hdr->frame_control &
458 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
459 case cpu_to_le16(IEEE80211_FCTL_TODS):
460 if (unlikely(iftype != NL80211_IFTYPE_AP &&
461 iftype != NL80211_IFTYPE_AP_VLAN &&
462 iftype != NL80211_IFTYPE_P2P_GO))
463 return -1;
464 break;
465 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
466 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
467 iftype != NL80211_IFTYPE_MESH_POINT &&
468 iftype != NL80211_IFTYPE_AP_VLAN &&
469 iftype != NL80211_IFTYPE_STATION))
470 return -1;
471 if (iftype == NL80211_IFTYPE_MESH_POINT) {
472 if (mesh_flags & MESH_FLAGS_AE_A4)
473 return -1;
474 if (mesh_flags & MESH_FLAGS_AE_A5_A6) {
475 skb_copy_bits(skb, hdrlen +
476 offsetof(struct ieee80211s_hdr, eaddr1),
477 tmp.h_dest, 2 * ETH_ALEN);
478 }
479 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
480 }
481 break;
482 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
483 if ((iftype != NL80211_IFTYPE_STATION &&
484 iftype != NL80211_IFTYPE_P2P_CLIENT &&
485 iftype != NL80211_IFTYPE_MESH_POINT) ||
486 (is_multicast_ether_addr(tmp.h_dest) &&
487 ether_addr_equal(tmp.h_source, addr)))
488 return -1;
489 if (iftype == NL80211_IFTYPE_MESH_POINT) {
490 if (mesh_flags & MESH_FLAGS_AE_A5_A6)
491 return -1;
492 if (mesh_flags & MESH_FLAGS_AE_A4)
493 skb_copy_bits(skb, hdrlen +
494 offsetof(struct ieee80211s_hdr, eaddr1),
495 tmp.h_source, ETH_ALEN);
496 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
497 }
498 break;
499 case cpu_to_le16(0):
500 if (iftype != NL80211_IFTYPE_ADHOC &&
501 iftype != NL80211_IFTYPE_STATION &&
502 iftype != NL80211_IFTYPE_OCB)
503 return -1;
504 break;
505 }
506
507 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
508 tmp.h_proto = payload.proto;
509
510 if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
511 tmp.h_proto != htons(ETH_P_AARP) &&
512 tmp.h_proto != htons(ETH_P_IPX)) ||
513 ether_addr_equal(payload.hdr, bridge_tunnel_header)))
514 /* remove RFC1042 or Bridge-Tunnel encapsulation and
515 * replace EtherType */
516 hdrlen += ETH_ALEN + 2;
517 else
518 tmp.h_proto = htons(skb->len - hdrlen);
519
520 pskb_pull(skb, hdrlen);
521
522 if (!ehdr)
523 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
524 memcpy(ehdr, &tmp, sizeof(tmp));
525
526 return 0;
527 }
528
529 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
530 enum nl80211_iftype iftype)
531 {
532 return __ieee80211_data_to_8023(skb, NULL, addr, iftype);
533 }
534 EXPORT_SYMBOL(ieee80211_data_to_8023);
535
536 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
537 enum nl80211_iftype iftype,
538 const u8 *bssid, bool qos)
539 {
540 struct ieee80211_hdr hdr;
541 u16 hdrlen, ethertype;
542 __le16 fc;
543 const u8 *encaps_data;
544 int encaps_len, skip_header_bytes;
545 int nh_pos, h_pos;
546 int head_need;
547
548 if (unlikely(skb->len < ETH_HLEN))
549 return -EINVAL;
550
551 nh_pos = skb_network_header(skb) - skb->data;
552 h_pos = skb_transport_header(skb) - skb->data;
553
554 /* convert Ethernet header to proper 802.11 header (based on
555 * operation mode) */
556 ethertype = (skb->data[12] << 8) | skb->data[13];
557 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
558
559 switch (iftype) {
560 case NL80211_IFTYPE_AP:
561 case NL80211_IFTYPE_AP_VLAN:
562 case NL80211_IFTYPE_P2P_GO:
563 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
564 /* DA BSSID SA */
565 memcpy(hdr.addr1, skb->data, ETH_ALEN);
566 memcpy(hdr.addr2, addr, ETH_ALEN);
567 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
568 hdrlen = 24;
569 break;
570 case NL80211_IFTYPE_STATION:
571 case NL80211_IFTYPE_P2P_CLIENT:
572 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
573 /* BSSID SA DA */
574 memcpy(hdr.addr1, bssid, ETH_ALEN);
575 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
576 memcpy(hdr.addr3, skb->data, ETH_ALEN);
577 hdrlen = 24;
578 break;
579 case NL80211_IFTYPE_OCB:
580 case NL80211_IFTYPE_ADHOC:
581 /* DA SA BSSID */
582 memcpy(hdr.addr1, skb->data, ETH_ALEN);
583 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
584 memcpy(hdr.addr3, bssid, ETH_ALEN);
585 hdrlen = 24;
586 break;
587 default:
588 return -EOPNOTSUPP;
589 }
590
591 if (qos) {
592 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
593 hdrlen += 2;
594 }
595
596 hdr.frame_control = fc;
597 hdr.duration_id = 0;
598 hdr.seq_ctrl = 0;
599
600 skip_header_bytes = ETH_HLEN;
601 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
602 encaps_data = bridge_tunnel_header;
603 encaps_len = sizeof(bridge_tunnel_header);
604 skip_header_bytes -= 2;
605 } else if (ethertype >= ETH_P_802_3_MIN) {
606 encaps_data = rfc1042_header;
607 encaps_len = sizeof(rfc1042_header);
608 skip_header_bytes -= 2;
609 } else {
610 encaps_data = NULL;
611 encaps_len = 0;
612 }
613
614 skb_pull(skb, skip_header_bytes);
615 nh_pos -= skip_header_bytes;
616 h_pos -= skip_header_bytes;
617
618 head_need = hdrlen + encaps_len - skb_headroom(skb);
619
620 if (head_need > 0 || skb_cloned(skb)) {
621 head_need = max(head_need, 0);
622 if (head_need)
623 skb_orphan(skb);
624
625 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
626 return -ENOMEM;
627
628 skb->truesize += head_need;
629 }
630
631 if (encaps_data) {
632 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
633 nh_pos += encaps_len;
634 h_pos += encaps_len;
635 }
636
637 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
638
639 nh_pos += hdrlen;
640 h_pos += hdrlen;
641
642 /* Update skb pointers to various headers since this modified frame
643 * is going to go through Linux networking code that may potentially
644 * need things like pointer to IP header. */
645 skb_reset_mac_header(skb);
646 skb_set_network_header(skb, nh_pos);
647 skb_set_transport_header(skb, h_pos);
648
649 return 0;
650 }
651 EXPORT_SYMBOL(ieee80211_data_from_8023);
652
653 static void
654 __frame_add_frag(struct sk_buff *skb, struct page *page,
655 void *ptr, int len, int size)
656 {
657 struct skb_shared_info *sh = skb_shinfo(skb);
658 int page_offset;
659
660 page_ref_inc(page);
661 page_offset = ptr - page_address(page);
662 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
663 }
664
665 static void
666 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
667 int offset, int len)
668 {
669 struct skb_shared_info *sh = skb_shinfo(skb);
670 const skb_frag_t *frag = &sh->frags[-1];
671 struct page *frag_page;
672 void *frag_ptr;
673 int frag_len, frag_size;
674 int head_size = skb->len - skb->data_len;
675 int cur_len;
676
677 frag_page = virt_to_head_page(skb->head);
678 frag_ptr = skb->data;
679 frag_size = head_size;
680
681 while (offset >= frag_size) {
682 offset -= frag_size;
683 frag++;
684 frag_page = skb_frag_page(frag);
685 frag_ptr = skb_frag_address(frag);
686 frag_size = skb_frag_size(frag);
687 }
688
689 frag_ptr += offset;
690 frag_len = frag_size - offset;
691
692 cur_len = min(len, frag_len);
693
694 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
695 len -= cur_len;
696
697 while (len > 0) {
698 frag++;
699 frag_len = skb_frag_size(frag);
700 cur_len = min(len, frag_len);
701 __frame_add_frag(frame, skb_frag_page(frag),
702 skb_frag_address(frag), cur_len, frag_len);
703 len -= cur_len;
704 }
705 }
706
707 static struct sk_buff *
708 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
709 int offset, int len, bool reuse_frag)
710 {
711 struct sk_buff *frame;
712 int cur_len = len;
713
714 if (skb->len - offset < len)
715 return NULL;
716
717 /*
718 * When reusing framents, copy some data to the head to simplify
719 * ethernet header handling and speed up protocol header processing
720 * in the stack later.
721 */
722 if (reuse_frag)
723 cur_len = min_t(int, len, 32);
724
725 /*
726 * Allocate and reserve two bytes more for payload
727 * alignment since sizeof(struct ethhdr) is 14.
728 */
729 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
730 if (!frame)
731 return NULL;
732
733 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
734 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
735
736 len -= cur_len;
737 if (!len)
738 return frame;
739
740 offset += cur_len;
741 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
742
743 return frame;
744 }
745
746 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
747 const u8 *addr, enum nl80211_iftype iftype,
748 const unsigned int extra_headroom,
749 bool has_80211_header)
750 {
751 unsigned int hlen = ALIGN(extra_headroom, 4);
752 struct sk_buff *frame = NULL;
753 u16 ethertype;
754 u8 *payload;
755 int offset = 0, remaining, err;
756 struct ethhdr eth;
757 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
758 bool reuse_skb = false;
759 bool last = false;
760
761 if (has_80211_header) {
762 err = __ieee80211_data_to_8023(skb, &eth, addr, iftype);
763 if (err)
764 goto out;
765 }
766
767 while (!last) {
768 unsigned int subframe_len;
769 int len;
770 u8 padding;
771
772 skb_copy_bits(skb, offset, &eth, sizeof(eth));
773 len = ntohs(eth.h_proto);
774 subframe_len = sizeof(struct ethhdr) + len;
775 padding = (4 - subframe_len) & 0x3;
776
777 /* the last MSDU has no padding */
778 remaining = skb->len - offset;
779 if (subframe_len > remaining)
780 goto purge;
781
782 offset += sizeof(struct ethhdr);
783 /* reuse skb for the last subframe */
784 last = remaining <= subframe_len + padding;
785 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
786 skb_pull(skb, offset);
787 frame = skb;
788 reuse_skb = true;
789 } else {
790 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
791 reuse_frag);
792 if (!frame)
793 goto purge;
794
795 offset += len + padding;
796 }
797
798 skb_reset_network_header(frame);
799 frame->dev = skb->dev;
800 frame->priority = skb->priority;
801
802 payload = frame->data;
803 ethertype = (payload[6] << 8) | payload[7];
804 if (likely((ether_addr_equal(payload, rfc1042_header) &&
805 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
806 ether_addr_equal(payload, bridge_tunnel_header))) {
807 eth.h_proto = htons(ethertype);
808 skb_pull(frame, ETH_ALEN + 2);
809 }
810
811 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
812 __skb_queue_tail(list, frame);
813 }
814
815 if (!reuse_skb)
816 dev_kfree_skb(skb);
817
818 return;
819
820 purge:
821 __skb_queue_purge(list);
822 out:
823 dev_kfree_skb(skb);
824 }
825 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
826
827 /* Given a data frame determine the 802.1p/1d tag to use. */
828 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
829 struct cfg80211_qos_map *qos_map)
830 {
831 unsigned int dscp;
832 unsigned char vlan_priority;
833
834 /* skb->priority values from 256->263 are magic values to
835 * directly indicate a specific 802.1d priority. This is used
836 * to allow 802.1d priority to be passed directly in from VLAN
837 * tags, etc.
838 */
839 if (skb->priority >= 256 && skb->priority <= 263)
840 return skb->priority - 256;
841
842 if (skb_vlan_tag_present(skb)) {
843 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
844 >> VLAN_PRIO_SHIFT;
845 if (vlan_priority > 0)
846 return vlan_priority;
847 }
848
849 switch (skb->protocol) {
850 case htons(ETH_P_IP):
851 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
852 break;
853 case htons(ETH_P_IPV6):
854 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
855 break;
856 case htons(ETH_P_MPLS_UC):
857 case htons(ETH_P_MPLS_MC): {
858 struct mpls_label mpls_tmp, *mpls;
859
860 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
861 sizeof(*mpls), &mpls_tmp);
862 if (!mpls)
863 return 0;
864
865 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
866 >> MPLS_LS_TC_SHIFT;
867 }
868 case htons(ETH_P_80221):
869 /* 802.21 is always network control traffic */
870 return 7;
871 default:
872 return 0;
873 }
874
875 if (qos_map) {
876 unsigned int i, tmp_dscp = dscp >> 2;
877
878 for (i = 0; i < qos_map->num_des; i++) {
879 if (tmp_dscp == qos_map->dscp_exception[i].dscp)
880 return qos_map->dscp_exception[i].up;
881 }
882
883 for (i = 0; i < 8; i++) {
884 if (tmp_dscp >= qos_map->up[i].low &&
885 tmp_dscp <= qos_map->up[i].high)
886 return i;
887 }
888 }
889
890 return dscp >> 5;
891 }
892 EXPORT_SYMBOL(cfg80211_classify8021d);
893
894 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
895 {
896 const struct cfg80211_bss_ies *ies;
897
898 ies = rcu_dereference(bss->ies);
899 if (!ies)
900 return NULL;
901
902 return cfg80211_find_ie(ie, ies->data, ies->len);
903 }
904 EXPORT_SYMBOL(ieee80211_bss_get_ie);
905
906 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
907 {
908 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
909 struct net_device *dev = wdev->netdev;
910 int i;
911
912 if (!wdev->connect_keys)
913 return;
914
915 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
916 if (!wdev->connect_keys->params[i].cipher)
917 continue;
918 if (rdev_add_key(rdev, dev, i, false, NULL,
919 &wdev->connect_keys->params[i])) {
920 netdev_err(dev, "failed to set key %d\n", i);
921 continue;
922 }
923 if (wdev->connect_keys->def == i)
924 if (rdev_set_default_key(rdev, dev, i, true, true)) {
925 netdev_err(dev, "failed to set defkey %d\n", i);
926 continue;
927 }
928 }
929
930 kzfree(wdev->connect_keys);
931 wdev->connect_keys = NULL;
932 }
933
934 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
935 {
936 struct cfg80211_event *ev;
937 unsigned long flags;
938 const u8 *bssid = NULL;
939
940 spin_lock_irqsave(&wdev->event_lock, flags);
941 while (!list_empty(&wdev->event_list)) {
942 ev = list_first_entry(&wdev->event_list,
943 struct cfg80211_event, list);
944 list_del(&ev->list);
945 spin_unlock_irqrestore(&wdev->event_lock, flags);
946
947 wdev_lock(wdev);
948 switch (ev->type) {
949 case EVENT_CONNECT_RESULT:
950 if (!is_zero_ether_addr(ev->cr.bssid))
951 bssid = ev->cr.bssid;
952 __cfg80211_connect_result(
953 wdev->netdev, bssid,
954 ev->cr.req_ie, ev->cr.req_ie_len,
955 ev->cr.resp_ie, ev->cr.resp_ie_len,
956 ev->cr.status,
957 ev->cr.status == WLAN_STATUS_SUCCESS,
958 ev->cr.bss);
959 break;
960 case EVENT_ROAMED:
961 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
962 ev->rm.req_ie_len, ev->rm.resp_ie,
963 ev->rm.resp_ie_len);
964 break;
965 case EVENT_DISCONNECTED:
966 __cfg80211_disconnected(wdev->netdev,
967 ev->dc.ie, ev->dc.ie_len,
968 ev->dc.reason,
969 !ev->dc.locally_generated);
970 break;
971 case EVENT_IBSS_JOINED:
972 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
973 ev->ij.channel);
974 break;
975 case EVENT_STOPPED:
976 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
977 break;
978 }
979 wdev_unlock(wdev);
980
981 kfree(ev);
982
983 spin_lock_irqsave(&wdev->event_lock, flags);
984 }
985 spin_unlock_irqrestore(&wdev->event_lock, flags);
986 }
987
988 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
989 {
990 struct wireless_dev *wdev;
991
992 ASSERT_RTNL();
993
994 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
995 cfg80211_process_wdev_events(wdev);
996 }
997
998 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
999 struct net_device *dev, enum nl80211_iftype ntype,
1000 u32 *flags, struct vif_params *params)
1001 {
1002 int err;
1003 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
1004
1005 ASSERT_RTNL();
1006
1007 /* don't support changing VLANs, you just re-create them */
1008 if (otype == NL80211_IFTYPE_AP_VLAN)
1009 return -EOPNOTSUPP;
1010
1011 /* cannot change into P2P device or NAN */
1012 if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
1013 ntype == NL80211_IFTYPE_NAN)
1014 return -EOPNOTSUPP;
1015
1016 if (!rdev->ops->change_virtual_intf ||
1017 !(rdev->wiphy.interface_modes & (1 << ntype)))
1018 return -EOPNOTSUPP;
1019
1020 /* if it's part of a bridge, reject changing type to station/ibss */
1021 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
1022 (ntype == NL80211_IFTYPE_ADHOC ||
1023 ntype == NL80211_IFTYPE_STATION ||
1024 ntype == NL80211_IFTYPE_P2P_CLIENT))
1025 return -EBUSY;
1026
1027 if (ntype != otype) {
1028 dev->ieee80211_ptr->use_4addr = false;
1029 dev->ieee80211_ptr->mesh_id_up_len = 0;
1030 wdev_lock(dev->ieee80211_ptr);
1031 rdev_set_qos_map(rdev, dev, NULL);
1032 wdev_unlock(dev->ieee80211_ptr);
1033
1034 switch (otype) {
1035 case NL80211_IFTYPE_AP:
1036 cfg80211_stop_ap(rdev, dev, true);
1037 break;
1038 case NL80211_IFTYPE_ADHOC:
1039 cfg80211_leave_ibss(rdev, dev, false);
1040 break;
1041 case NL80211_IFTYPE_STATION:
1042 case NL80211_IFTYPE_P2P_CLIENT:
1043 wdev_lock(dev->ieee80211_ptr);
1044 cfg80211_disconnect(rdev, dev,
1045 WLAN_REASON_DEAUTH_LEAVING, true);
1046 wdev_unlock(dev->ieee80211_ptr);
1047 break;
1048 case NL80211_IFTYPE_MESH_POINT:
1049 /* mesh should be handled? */
1050 break;
1051 default:
1052 break;
1053 }
1054
1055 cfg80211_process_rdev_events(rdev);
1056 }
1057
1058 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
1059
1060 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1061
1062 if (!err && params && params->use_4addr != -1)
1063 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1064
1065 if (!err) {
1066 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1067 switch (ntype) {
1068 case NL80211_IFTYPE_STATION:
1069 if (dev->ieee80211_ptr->use_4addr)
1070 break;
1071 /* fall through */
1072 case NL80211_IFTYPE_OCB:
1073 case NL80211_IFTYPE_P2P_CLIENT:
1074 case NL80211_IFTYPE_ADHOC:
1075 dev->priv_flags |= IFF_DONT_BRIDGE;
1076 break;
1077 case NL80211_IFTYPE_P2P_GO:
1078 case NL80211_IFTYPE_AP:
1079 case NL80211_IFTYPE_AP_VLAN:
1080 case NL80211_IFTYPE_WDS:
1081 case NL80211_IFTYPE_MESH_POINT:
1082 /* bridging OK */
1083 break;
1084 case NL80211_IFTYPE_MONITOR:
1085 /* monitor can't bridge anyway */
1086 break;
1087 case NL80211_IFTYPE_UNSPECIFIED:
1088 case NUM_NL80211_IFTYPES:
1089 /* not happening */
1090 break;
1091 case NL80211_IFTYPE_P2P_DEVICE:
1092 case NL80211_IFTYPE_NAN:
1093 WARN_ON(1);
1094 break;
1095 }
1096 }
1097
1098 if (!err && ntype != otype && netif_running(dev)) {
1099 cfg80211_update_iface_num(rdev, ntype, 1);
1100 cfg80211_update_iface_num(rdev, otype, -1);
1101 }
1102
1103 return err;
1104 }
1105
1106 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1107 {
1108 static const u32 __mcs2bitrate[] = {
1109 /* control PHY */
1110 [0] = 275,
1111 /* SC PHY */
1112 [1] = 3850,
1113 [2] = 7700,
1114 [3] = 9625,
1115 [4] = 11550,
1116 [5] = 12512, /* 1251.25 mbps */
1117 [6] = 15400,
1118 [7] = 19250,
1119 [8] = 23100,
1120 [9] = 25025,
1121 [10] = 30800,
1122 [11] = 38500,
1123 [12] = 46200,
1124 /* OFDM PHY */
1125 [13] = 6930,
1126 [14] = 8662, /* 866.25 mbps */
1127 [15] = 13860,
1128 [16] = 17325,
1129 [17] = 20790,
1130 [18] = 27720,
1131 [19] = 34650,
1132 [20] = 41580,
1133 [21] = 45045,
1134 [22] = 51975,
1135 [23] = 62370,
1136 [24] = 67568, /* 6756.75 mbps */
1137 /* LP-SC PHY */
1138 [25] = 6260,
1139 [26] = 8340,
1140 [27] = 11120,
1141 [28] = 12510,
1142 [29] = 16680,
1143 [30] = 22240,
1144 [31] = 25030,
1145 };
1146
1147 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1148 return 0;
1149
1150 return __mcs2bitrate[rate->mcs];
1151 }
1152
1153 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1154 {
1155 static const u32 base[4][10] = {
1156 { 6500000,
1157 13000000,
1158 19500000,
1159 26000000,
1160 39000000,
1161 52000000,
1162 58500000,
1163 65000000,
1164 78000000,
1165 0,
1166 },
1167 { 13500000,
1168 27000000,
1169 40500000,
1170 54000000,
1171 81000000,
1172 108000000,
1173 121500000,
1174 135000000,
1175 162000000,
1176 180000000,
1177 },
1178 { 29300000,
1179 58500000,
1180 87800000,
1181 117000000,
1182 175500000,
1183 234000000,
1184 263300000,
1185 292500000,
1186 351000000,
1187 390000000,
1188 },
1189 { 58500000,
1190 117000000,
1191 175500000,
1192 234000000,
1193 351000000,
1194 468000000,
1195 526500000,
1196 585000000,
1197 702000000,
1198 780000000,
1199 },
1200 };
1201 u32 bitrate;
1202 int idx;
1203
1204 if (WARN_ON_ONCE(rate->mcs > 9))
1205 return 0;
1206
1207 switch (rate->bw) {
1208 case RATE_INFO_BW_160:
1209 idx = 3;
1210 break;
1211 case RATE_INFO_BW_80:
1212 idx = 2;
1213 break;
1214 case RATE_INFO_BW_40:
1215 idx = 1;
1216 break;
1217 case RATE_INFO_BW_5:
1218 case RATE_INFO_BW_10:
1219 default:
1220 WARN_ON(1);
1221 /* fall through */
1222 case RATE_INFO_BW_20:
1223 idx = 0;
1224 }
1225
1226 bitrate = base[idx][rate->mcs];
1227 bitrate *= rate->nss;
1228
1229 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1230 bitrate = (bitrate / 9) * 10;
1231
1232 /* do NOT round down here */
1233 return (bitrate + 50000) / 100000;
1234 }
1235
1236 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1237 {
1238 int modulation, streams, bitrate;
1239
1240 if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1241 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1242 return rate->legacy;
1243 if (rate->flags & RATE_INFO_FLAGS_60G)
1244 return cfg80211_calculate_bitrate_60g(rate);
1245 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1246 return cfg80211_calculate_bitrate_vht(rate);
1247
1248 /* the formula below does only work for MCS values smaller than 32 */
1249 if (WARN_ON_ONCE(rate->mcs >= 32))
1250 return 0;
1251
1252 modulation = rate->mcs & 7;
1253 streams = (rate->mcs >> 3) + 1;
1254
1255 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1256
1257 if (modulation < 4)
1258 bitrate *= (modulation + 1);
1259 else if (modulation == 4)
1260 bitrate *= (modulation + 2);
1261 else
1262 bitrate *= (modulation + 3);
1263
1264 bitrate *= streams;
1265
1266 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1267 bitrate = (bitrate / 9) * 10;
1268
1269 /* do NOT round down here */
1270 return (bitrate + 50000) / 100000;
1271 }
1272 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1273
1274 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1275 enum ieee80211_p2p_attr_id attr,
1276 u8 *buf, unsigned int bufsize)
1277 {
1278 u8 *out = buf;
1279 u16 attr_remaining = 0;
1280 bool desired_attr = false;
1281 u16 desired_len = 0;
1282
1283 while (len > 0) {
1284 unsigned int iedatalen;
1285 unsigned int copy;
1286 const u8 *iedata;
1287
1288 if (len < 2)
1289 return -EILSEQ;
1290 iedatalen = ies[1];
1291 if (iedatalen + 2 > len)
1292 return -EILSEQ;
1293
1294 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1295 goto cont;
1296
1297 if (iedatalen < 4)
1298 goto cont;
1299
1300 iedata = ies + 2;
1301
1302 /* check WFA OUI, P2P subtype */
1303 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1304 iedata[2] != 0x9a || iedata[3] != 0x09)
1305 goto cont;
1306
1307 iedatalen -= 4;
1308 iedata += 4;
1309
1310 /* check attribute continuation into this IE */
1311 copy = min_t(unsigned int, attr_remaining, iedatalen);
1312 if (copy && desired_attr) {
1313 desired_len += copy;
1314 if (out) {
1315 memcpy(out, iedata, min(bufsize, copy));
1316 out += min(bufsize, copy);
1317 bufsize -= min(bufsize, copy);
1318 }
1319
1320
1321 if (copy == attr_remaining)
1322 return desired_len;
1323 }
1324
1325 attr_remaining -= copy;
1326 if (attr_remaining)
1327 goto cont;
1328
1329 iedatalen -= copy;
1330 iedata += copy;
1331
1332 while (iedatalen > 0) {
1333 u16 attr_len;
1334
1335 /* P2P attribute ID & size must fit */
1336 if (iedatalen < 3)
1337 return -EILSEQ;
1338 desired_attr = iedata[0] == attr;
1339 attr_len = get_unaligned_le16(iedata + 1);
1340 iedatalen -= 3;
1341 iedata += 3;
1342
1343 copy = min_t(unsigned int, attr_len, iedatalen);
1344
1345 if (desired_attr) {
1346 desired_len += copy;
1347 if (out) {
1348 memcpy(out, iedata, min(bufsize, copy));
1349 out += min(bufsize, copy);
1350 bufsize -= min(bufsize, copy);
1351 }
1352
1353 if (copy == attr_len)
1354 return desired_len;
1355 }
1356
1357 iedata += copy;
1358 iedatalen -= copy;
1359 attr_remaining = attr_len - copy;
1360 }
1361
1362 cont:
1363 len -= ies[1] + 2;
1364 ies += ies[1] + 2;
1365 }
1366
1367 if (attr_remaining && desired_attr)
1368 return -EILSEQ;
1369
1370 return -ENOENT;
1371 }
1372 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1373
1374 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1375 {
1376 int i;
1377
1378 for (i = 0; i < n_ids; i++)
1379 if (ids[i] == id)
1380 return true;
1381 return false;
1382 }
1383
1384 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1385 const u8 *ids, int n_ids,
1386 const u8 *after_ric, int n_after_ric,
1387 size_t offset)
1388 {
1389 size_t pos = offset;
1390
1391 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1392 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1393 pos += 2 + ies[pos + 1];
1394
1395 while (pos < ielen &&
1396 !ieee80211_id_in_list(after_ric, n_after_ric,
1397 ies[pos]))
1398 pos += 2 + ies[pos + 1];
1399 } else {
1400 pos += 2 + ies[pos + 1];
1401 }
1402 }
1403
1404 return pos;
1405 }
1406 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1407
1408 bool ieee80211_operating_class_to_band(u8 operating_class,
1409 enum nl80211_band *band)
1410 {
1411 switch (operating_class) {
1412 case 112:
1413 case 115 ... 127:
1414 case 128 ... 130:
1415 *band = NL80211_BAND_5GHZ;
1416 return true;
1417 case 81:
1418 case 82:
1419 case 83:
1420 case 84:
1421 *band = NL80211_BAND_2GHZ;
1422 return true;
1423 case 180:
1424 *band = NL80211_BAND_60GHZ;
1425 return true;
1426 }
1427
1428 return false;
1429 }
1430 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1431
1432 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1433 u8 *op_class)
1434 {
1435 u8 vht_opclass;
1436 u16 freq = chandef->center_freq1;
1437
1438 if (freq >= 2412 && freq <= 2472) {
1439 if (chandef->width > NL80211_CHAN_WIDTH_40)
1440 return false;
1441
1442 /* 2.407 GHz, channels 1..13 */
1443 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1444 if (freq > chandef->chan->center_freq)
1445 *op_class = 83; /* HT40+ */
1446 else
1447 *op_class = 84; /* HT40- */
1448 } else {
1449 *op_class = 81;
1450 }
1451
1452 return true;
1453 }
1454
1455 if (freq == 2484) {
1456 if (chandef->width > NL80211_CHAN_WIDTH_40)
1457 return false;
1458
1459 *op_class = 82; /* channel 14 */
1460 return true;
1461 }
1462
1463 switch (chandef->width) {
1464 case NL80211_CHAN_WIDTH_80:
1465 vht_opclass = 128;
1466 break;
1467 case NL80211_CHAN_WIDTH_160:
1468 vht_opclass = 129;
1469 break;
1470 case NL80211_CHAN_WIDTH_80P80:
1471 vht_opclass = 130;
1472 break;
1473 case NL80211_CHAN_WIDTH_10:
1474 case NL80211_CHAN_WIDTH_5:
1475 return false; /* unsupported for now */
1476 default:
1477 vht_opclass = 0;
1478 break;
1479 }
1480
1481 /* 5 GHz, channels 36..48 */
1482 if (freq >= 5180 && freq <= 5240) {
1483 if (vht_opclass) {
1484 *op_class = vht_opclass;
1485 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1486 if (freq > chandef->chan->center_freq)
1487 *op_class = 116;
1488 else
1489 *op_class = 117;
1490 } else {
1491 *op_class = 115;
1492 }
1493
1494 return true;
1495 }
1496
1497 /* 5 GHz, channels 52..64 */
1498 if (freq >= 5260 && freq <= 5320) {
1499 if (vht_opclass) {
1500 *op_class = vht_opclass;
1501 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1502 if (freq > chandef->chan->center_freq)
1503 *op_class = 119;
1504 else
1505 *op_class = 120;
1506 } else {
1507 *op_class = 118;
1508 }
1509
1510 return true;
1511 }
1512
1513 /* 5 GHz, channels 100..144 */
1514 if (freq >= 5500 && freq <= 5720) {
1515 if (vht_opclass) {
1516 *op_class = vht_opclass;
1517 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1518 if (freq > chandef->chan->center_freq)
1519 *op_class = 122;
1520 else
1521 *op_class = 123;
1522 } else {
1523 *op_class = 121;
1524 }
1525
1526 return true;
1527 }
1528
1529 /* 5 GHz, channels 149..169 */
1530 if (freq >= 5745 && freq <= 5845) {
1531 if (vht_opclass) {
1532 *op_class = vht_opclass;
1533 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1534 if (freq > chandef->chan->center_freq)
1535 *op_class = 126;
1536 else
1537 *op_class = 127;
1538 } else if (freq <= 5805) {
1539 *op_class = 124;
1540 } else {
1541 *op_class = 125;
1542 }
1543
1544 return true;
1545 }
1546
1547 /* 56.16 GHz, channel 1..4 */
1548 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1549 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1550 return false;
1551
1552 *op_class = 180;
1553 return true;
1554 }
1555
1556 /* not supported yet */
1557 return false;
1558 }
1559 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1560
1561 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1562 u32 beacon_int)
1563 {
1564 struct wireless_dev *wdev;
1565 int res = 0;
1566
1567 if (beacon_int < 10 || beacon_int > 10000)
1568 return -EINVAL;
1569
1570 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1571 if (!wdev->beacon_interval)
1572 continue;
1573 if (wdev->beacon_interval != beacon_int) {
1574 res = -EINVAL;
1575 break;
1576 }
1577 }
1578
1579 return res;
1580 }
1581
1582 int cfg80211_iter_combinations(struct wiphy *wiphy,
1583 const int num_different_channels,
1584 const u8 radar_detect,
1585 const int iftype_num[NUM_NL80211_IFTYPES],
1586 void (*iter)(const struct ieee80211_iface_combination *c,
1587 void *data),
1588 void *data)
1589 {
1590 const struct ieee80211_regdomain *regdom;
1591 enum nl80211_dfs_regions region = 0;
1592 int i, j, iftype;
1593 int num_interfaces = 0;
1594 u32 used_iftypes = 0;
1595
1596 if (radar_detect) {
1597 rcu_read_lock();
1598 regdom = rcu_dereference(cfg80211_regdomain);
1599 if (regdom)
1600 region = regdom->dfs_region;
1601 rcu_read_unlock();
1602 }
1603
1604 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1605 num_interfaces += iftype_num[iftype];
1606 if (iftype_num[iftype] > 0 &&
1607 !(wiphy->software_iftypes & BIT(iftype)))
1608 used_iftypes |= BIT(iftype);
1609 }
1610
1611 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1612 const struct ieee80211_iface_combination *c;
1613 struct ieee80211_iface_limit *limits;
1614 u32 all_iftypes = 0;
1615
1616 c = &wiphy->iface_combinations[i];
1617
1618 if (num_interfaces > c->max_interfaces)
1619 continue;
1620 if (num_different_channels > c->num_different_channels)
1621 continue;
1622
1623 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1624 GFP_KERNEL);
1625 if (!limits)
1626 return -ENOMEM;
1627
1628 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1629 if (wiphy->software_iftypes & BIT(iftype))
1630 continue;
1631 for (j = 0; j < c->n_limits; j++) {
1632 all_iftypes |= limits[j].types;
1633 if (!(limits[j].types & BIT(iftype)))
1634 continue;
1635 if (limits[j].max < iftype_num[iftype])
1636 goto cont;
1637 limits[j].max -= iftype_num[iftype];
1638 }
1639 }
1640
1641 if (radar_detect != (c->radar_detect_widths & radar_detect))
1642 goto cont;
1643
1644 if (radar_detect && c->radar_detect_regions &&
1645 !(c->radar_detect_regions & BIT(region)))
1646 goto cont;
1647
1648 /* Finally check that all iftypes that we're currently
1649 * using are actually part of this combination. If they
1650 * aren't then we can't use this combination and have
1651 * to continue to the next.
1652 */
1653 if ((all_iftypes & used_iftypes) != used_iftypes)
1654 goto cont;
1655
1656 /* This combination covered all interface types and
1657 * supported the requested numbers, so we're good.
1658 */
1659
1660 (*iter)(c, data);
1661 cont:
1662 kfree(limits);
1663 }
1664
1665 return 0;
1666 }
1667 EXPORT_SYMBOL(cfg80211_iter_combinations);
1668
1669 static void
1670 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1671 void *data)
1672 {
1673 int *num = data;
1674 (*num)++;
1675 }
1676
1677 int cfg80211_check_combinations(struct wiphy *wiphy,
1678 const int num_different_channels,
1679 const u8 radar_detect,
1680 const int iftype_num[NUM_NL80211_IFTYPES])
1681 {
1682 int err, num = 0;
1683
1684 err = cfg80211_iter_combinations(wiphy, num_different_channels,
1685 radar_detect, iftype_num,
1686 cfg80211_iter_sum_ifcombs, &num);
1687 if (err)
1688 return err;
1689 if (num == 0)
1690 return -EBUSY;
1691
1692 return 0;
1693 }
1694 EXPORT_SYMBOL(cfg80211_check_combinations);
1695
1696 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1697 const u8 *rates, unsigned int n_rates,
1698 u32 *mask)
1699 {
1700 int i, j;
1701
1702 if (!sband)
1703 return -EINVAL;
1704
1705 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1706 return -EINVAL;
1707
1708 *mask = 0;
1709
1710 for (i = 0; i < n_rates; i++) {
1711 int rate = (rates[i] & 0x7f) * 5;
1712 bool found = false;
1713
1714 for (j = 0; j < sband->n_bitrates; j++) {
1715 if (sband->bitrates[j].bitrate == rate) {
1716 found = true;
1717 *mask |= BIT(j);
1718 break;
1719 }
1720 }
1721 if (!found)
1722 return -EINVAL;
1723 }
1724
1725 /*
1726 * mask must have at least one bit set here since we
1727 * didn't accept a 0-length rates array nor allowed
1728 * entries in the array that didn't exist
1729 */
1730
1731 return 0;
1732 }
1733
1734 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1735 {
1736 enum nl80211_band band;
1737 unsigned int n_channels = 0;
1738
1739 for (band = 0; band < NUM_NL80211_BANDS; band++)
1740 if (wiphy->bands[band])
1741 n_channels += wiphy->bands[band]->n_channels;
1742
1743 return n_channels;
1744 }
1745 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1746
1747 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1748 struct station_info *sinfo)
1749 {
1750 struct cfg80211_registered_device *rdev;
1751 struct wireless_dev *wdev;
1752
1753 wdev = dev->ieee80211_ptr;
1754 if (!wdev)
1755 return -EOPNOTSUPP;
1756
1757 rdev = wiphy_to_rdev(wdev->wiphy);
1758 if (!rdev->ops->get_station)
1759 return -EOPNOTSUPP;
1760
1761 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1762 }
1763 EXPORT_SYMBOL(cfg80211_get_station);
1764
1765 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1766 {
1767 int i;
1768
1769 if (!f)
1770 return;
1771
1772 kfree(f->serv_spec_info);
1773 kfree(f->srf_bf);
1774 kfree(f->srf_macs);
1775 for (i = 0; i < f->num_rx_filters; i++)
1776 kfree(f->rx_filters[i].filter);
1777
1778 for (i = 0; i < f->num_tx_filters; i++)
1779 kfree(f->tx_filters[i].filter);
1780
1781 kfree(f->rx_filters);
1782 kfree(f->tx_filters);
1783 kfree(f);
1784 }
1785 EXPORT_SYMBOL(cfg80211_free_nan_func);
1786
1787 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1788 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1789 const unsigned char rfc1042_header[] __aligned(2) =
1790 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1791 EXPORT_SYMBOL(rfc1042_header);
1792
1793 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1794 const unsigned char bridge_tunnel_header[] __aligned(2) =
1795 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1796 EXPORT_SYMBOL(bridge_tunnel_header);
Linux with added FPC-III support