Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/net/wireless/util.c

  1 /*
  2  * Wireless utility functions
  3  *
  4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
  5  * Copyright 2013-2014  Intel Mobile Communications GmbH
  6  */
  7 #include <linux/export.h>
  8 #include <linux/bitops.h>
  9 #include <linux/etherdevice.h>
 10 #include <linux/slab.h>
 11 #include <net/cfg80211.h>
 12 #include <net/ip.h>
 13 #include <net/dsfield.h>
 14 #include <linux/if_vlan.h>
 15 #include <linux/mpls.h>
 16 #include "core.h"
 17 #include "rdev-ops.h"
 18 
 19 
 20 struct ieee80211_rate *
 21 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
 22                             u32 basic_rates, int bitrate)
 23 {
 24         struct ieee80211_rate *result = &sband->bitrates[0];
 25         int i;
 26 
 27         for (i = 0; i < sband->n_bitrates; i++) {
 28                 if (!(basic_rates & BIT(i)))
 29                         continue;
 30                 if (sband->bitrates[i].bitrate > bitrate)
 31                         continue;
 32                 result = &sband->bitrates[i];
 33         }
 34 
 35         return result;
 36 }
 37 EXPORT_SYMBOL(ieee80211_get_response_rate);
 38 
 39 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
 40                               enum nl80211_bss_scan_width scan_width)
 41 {
 42         struct ieee80211_rate *bitrates;
 43         u32 mandatory_rates = 0;
 44         enum ieee80211_rate_flags mandatory_flag;
 45         int i;
 46 
 47         if (WARN_ON(!sband))
 48                 return 1;
 49 
 50         if (sband->band == IEEE80211_BAND_2GHZ) {
 51                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
 52                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
 53                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
 54                 else
 55                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 56         } else {
 57                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 58         }
 59 
 60         bitrates = sband->bitrates;
 61         for (i = 0; i < sband->n_bitrates; i++)
 62                 if (bitrates[i].flags & mandatory_flag)
 63                         mandatory_rates |= BIT(i);
 64         return mandatory_rates;
 65 }
 66 EXPORT_SYMBOL(ieee80211_mandatory_rates);
 67 
 68 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
 69 {
 70         /* see 802.11 17.3.8.3.2 and Annex J
 71          * there are overlapping channel numbers in 5GHz and 2GHz bands */
 72         if (chan <= 0)
 73                 return 0; /* not supported */
 74         switch (band) {
 75         case IEEE80211_BAND_2GHZ:
 76                 if (chan == 14)
 77                         return 2484;
 78                 else if (chan < 14)
 79                         return 2407 + chan * 5;
 80                 break;
 81         case IEEE80211_BAND_5GHZ:
 82                 if (chan >= 182 && chan <= 196)
 83                         return 4000 + chan * 5;
 84                 else
 85                         return 5000 + chan * 5;
 86                 break;
 87         case IEEE80211_BAND_60GHZ:
 88                 if (chan < 5)
 89                         return 56160 + chan * 2160;
 90                 break;
 91         default:
 92                 ;
 93         }
 94         return 0; /* not supported */
 95 }
 96 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
 97 
 98 int ieee80211_frequency_to_channel(int freq)
 99 {
100         /* see 802.11 17.3.8.3.2 and Annex J */
101         if (freq == 2484)
102                 return 14;
103         else if (freq < 2484)
104                 return (freq - 2407) / 5;
105         else if (freq >= 4910 && freq <= 4980)
106                 return (freq - 4000) / 5;
107         else if (freq <= 45000) /* DMG band lower limit */
108                 return (freq - 5000) / 5;
109         else if (freq >= 58320 && freq <= 64800)
110                 return (freq - 56160) / 2160;
111         else
112                 return 0;
113 }
114 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
115 
116 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
117                                                   int freq)
118 {
119         enum ieee80211_band band;
120         struct ieee80211_supported_band *sband;
121         int i;
122 
123         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
124                 sband = wiphy->bands[band];
125 
126                 if (!sband)
127                         continue;
128 
129                 for (i = 0; i < sband->n_channels; i++) {
130                         if (sband->channels[i].center_freq == freq)
131                                 return &sband->channels[i];
132                 }
133         }
134 
135         return NULL;
136 }
137 EXPORT_SYMBOL(__ieee80211_get_channel);
138 
139 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
140                                      enum ieee80211_band band)
141 {
142         int i, want;
143 
144         switch (band) {
145         case IEEE80211_BAND_5GHZ:
146                 want = 3;
147                 for (i = 0; i < sband->n_bitrates; i++) {
148                         if (sband->bitrates[i].bitrate == 60 ||
149                             sband->bitrates[i].bitrate == 120 ||
150                             sband->bitrates[i].bitrate == 240) {
151                                 sband->bitrates[i].flags |=
152                                         IEEE80211_RATE_MANDATORY_A;
153                                 want--;
154                         }
155                 }
156                 WARN_ON(want);
157                 break;
158         case IEEE80211_BAND_2GHZ:
159                 want = 7;
160                 for (i = 0; i < sband->n_bitrates; i++) {
161                         if (sband->bitrates[i].bitrate == 10) {
162                                 sband->bitrates[i].flags |=
163                                         IEEE80211_RATE_MANDATORY_B |
164                                         IEEE80211_RATE_MANDATORY_G;
165                                 want--;
166                         }
167 
168                         if (sband->bitrates[i].bitrate == 20 ||
169                             sband->bitrates[i].bitrate == 55 ||
170                             sband->bitrates[i].bitrate == 110 ||
171                             sband->bitrates[i].bitrate == 60 ||
172                             sband->bitrates[i].bitrate == 120 ||
173                             sband->bitrates[i].bitrate == 240) {
174                                 sband->bitrates[i].flags |=
175                                         IEEE80211_RATE_MANDATORY_G;
176                                 want--;
177                         }
178 
179                         if (sband->bitrates[i].bitrate != 10 &&
180                             sband->bitrates[i].bitrate != 20 &&
181                             sband->bitrates[i].bitrate != 55 &&
182                             sband->bitrates[i].bitrate != 110)
183                                 sband->bitrates[i].flags |=
184                                         IEEE80211_RATE_ERP_G;
185                 }
186                 WARN_ON(want != 0 && want != 3 && want != 6);
187                 break;
188         case IEEE80211_BAND_60GHZ:
189                 /* check for mandatory HT MCS 1..4 */
190                 WARN_ON(!sband->ht_cap.ht_supported);
191                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
192                 break;
193         case IEEE80211_NUM_BANDS:
194                 WARN_ON(1);
195                 break;
196         }
197 }
198 
199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
200 {
201         enum ieee80211_band band;
202 
203         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
204                 if (wiphy->bands[band])
205                         set_mandatory_flags_band(wiphy->bands[band], band);
206 }
207 
208 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
209 {
210         int i;
211         for (i = 0; i < wiphy->n_cipher_suites; i++)
212                 if (cipher == wiphy->cipher_suites[i])
213                         return true;
214         return false;
215 }
216 
217 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
218                                    struct key_params *params, int key_idx,
219                                    bool pairwise, const u8 *mac_addr)
220 {
221         if (key_idx > 5)
222                 return -EINVAL;
223 
224         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
225                 return -EINVAL;
226 
227         if (pairwise && !mac_addr)
228                 return -EINVAL;
229 
230         /*
231          * Disallow pairwise keys with non-zero index unless it's WEP
232          * or a vendor specific cipher (because current deployments use
233          * pairwise WEP keys with non-zero indices and for vendor specific
234          * ciphers this should be validated in the driver or hardware level
235          * - but 802.11i clearly specifies to use zero)
236          */
237         if (pairwise && key_idx &&
238             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
239              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
240              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
241                 return -EINVAL;
242 
243         switch (params->cipher) {
244         case WLAN_CIPHER_SUITE_WEP40:
245                 if (params->key_len != WLAN_KEY_LEN_WEP40)
246                         return -EINVAL;
247                 break;
248         case WLAN_CIPHER_SUITE_TKIP:
249                 if (params->key_len != WLAN_KEY_LEN_TKIP)
250                         return -EINVAL;
251                 break;
252         case WLAN_CIPHER_SUITE_CCMP:
253                 if (params->key_len != WLAN_KEY_LEN_CCMP)
254                         return -EINVAL;
255                 break;
256         case WLAN_CIPHER_SUITE_WEP104:
257                 if (params->key_len != WLAN_KEY_LEN_WEP104)
258                         return -EINVAL;
259                 break;
260         case WLAN_CIPHER_SUITE_AES_CMAC:
261                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
262                         return -EINVAL;
263                 break;
264         default:
265                 /*
266                  * We don't know anything about this algorithm,
267                  * allow using it -- but the driver must check
268                  * all parameters! We still check below whether
269                  * or not the driver supports this algorithm,
270                  * of course.
271                  */
272                 break;
273         }
274 
275         if (params->seq) {
276                 switch (params->cipher) {
277                 case WLAN_CIPHER_SUITE_WEP40:
278                 case WLAN_CIPHER_SUITE_WEP104:
279                         /* These ciphers do not use key sequence */
280                         return -EINVAL;
281                 case WLAN_CIPHER_SUITE_TKIP:
282                 case WLAN_CIPHER_SUITE_CCMP:
283                 case WLAN_CIPHER_SUITE_AES_CMAC:
284                         if (params->seq_len != 6)
285                                 return -EINVAL;
286                         break;
287                 }
288         }
289 
290         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
291                 return -EINVAL;
292 
293         return 0;
294 }
295 
296 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
297 {
298         unsigned int hdrlen = 24;
299 
300         if (ieee80211_is_data(fc)) {
301                 if (ieee80211_has_a4(fc))
302                         hdrlen = 30;
303                 if (ieee80211_is_data_qos(fc)) {
304                         hdrlen += IEEE80211_QOS_CTL_LEN;
305                         if (ieee80211_has_order(fc))
306                                 hdrlen += IEEE80211_HT_CTL_LEN;
307                 }
308                 goto out;
309         }
310 
311         if (ieee80211_is_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);
1578 

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