Version:  2.0.40 2.2.26 2.4.37 3.1 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

Linux/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);
1577 

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