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