Version:  2.0.40 2.2.26 2.4.37 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 3.19

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_mgmt(fc)) {
312                 if (ieee80211_has_order(fc))
313                         hdrlen += IEEE80211_HT_CTL_LEN;
314                 goto out;
315         }
316 
317         if (ieee80211_is_ctl(fc)) {
318                 /*
319                  * ACK and CTS are 10 bytes, all others 16. To see how
320                  * to get this condition consider
321                  *   subtype mask:   0b0000000011110000 (0x00F0)
322                  *   ACK subtype:    0b0000000011010000 (0x00D0)
323                  *   CTS subtype:    0b0000000011000000 (0x00C0)
324                  *   bits that matter:         ^^^      (0x00E0)
325                  *   value of those: 0b0000000011000000 (0x00C0)
326                  */
327                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
328                         hdrlen = 10;
329                 else
330                         hdrlen = 16;
331         }
332 out:
333         return hdrlen;
334 }
335 EXPORT_SYMBOL(ieee80211_hdrlen);
336 
337 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
338 {
339         const struct ieee80211_hdr *hdr =
340                         (const struct ieee80211_hdr *)skb->data;
341         unsigned int hdrlen;
342 
343         if (unlikely(skb->len < 10))
344                 return 0;
345         hdrlen = ieee80211_hdrlen(hdr->frame_control);
346         if (unlikely(hdrlen > skb->len))
347                 return 0;
348         return hdrlen;
349 }
350 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
351 
352 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
353 {
354         int ae = meshhdr->flags & MESH_FLAGS_AE;
355         /* 802.11-2012, 8.2.4.7.3 */
356         switch (ae) {
357         default:
358         case 0:
359                 return 6;
360         case MESH_FLAGS_AE_A4:
361                 return 12;
362         case MESH_FLAGS_AE_A5_A6:
363                 return 18;
364         }
365 }
366 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
367 
368 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
369                            enum nl80211_iftype iftype)
370 {
371         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
372         u16 hdrlen, ethertype;
373         u8 *payload;
374         u8 dst[ETH_ALEN];
375         u8 src[ETH_ALEN] __aligned(2);
376 
377         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
378                 return -1;
379 
380         hdrlen = ieee80211_hdrlen(hdr->frame_control);
381 
382         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
383          * header
384          * IEEE 802.11 address fields:
385          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
386          *   0     0   DA    SA    BSSID n/a
387          *   0     1   DA    BSSID SA    n/a
388          *   1     0   BSSID SA    DA    n/a
389          *   1     1   RA    TA    DA    SA
390          */
391         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
392         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
393 
394         switch (hdr->frame_control &
395                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
396         case cpu_to_le16(IEEE80211_FCTL_TODS):
397                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
398                              iftype != NL80211_IFTYPE_AP_VLAN &&
399                              iftype != NL80211_IFTYPE_P2P_GO))
400                         return -1;
401                 break;
402         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
403                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
404                              iftype != NL80211_IFTYPE_MESH_POINT &&
405                              iftype != NL80211_IFTYPE_AP_VLAN &&
406                              iftype != NL80211_IFTYPE_STATION))
407                         return -1;
408                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
409                         struct ieee80211s_hdr *meshdr =
410                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
411                         /* make sure meshdr->flags is on the linear part */
412                         if (!pskb_may_pull(skb, hdrlen + 1))
413                                 return -1;
414                         if (meshdr->flags & MESH_FLAGS_AE_A4)
415                                 return -1;
416                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
417                                 skb_copy_bits(skb, hdrlen +
418                                         offsetof(struct ieee80211s_hdr, eaddr1),
419                                         dst, ETH_ALEN);
420                                 skb_copy_bits(skb, hdrlen +
421                                         offsetof(struct ieee80211s_hdr, eaddr2),
422                                         src, ETH_ALEN);
423                         }
424                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
425                 }
426                 break;
427         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
428                 if ((iftype != NL80211_IFTYPE_STATION &&
429                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
430                      iftype != NL80211_IFTYPE_MESH_POINT) ||
431                     (is_multicast_ether_addr(dst) &&
432                      ether_addr_equal(src, addr)))
433                         return -1;
434                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
435                         struct ieee80211s_hdr *meshdr =
436                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
437                         /* make sure meshdr->flags is on the linear part */
438                         if (!pskb_may_pull(skb, hdrlen + 1))
439                                 return -1;
440                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
441                                 return -1;
442                         if (meshdr->flags & MESH_FLAGS_AE_A4)
443                                 skb_copy_bits(skb, hdrlen +
444                                         offsetof(struct ieee80211s_hdr, eaddr1),
445                                         src, ETH_ALEN);
446                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
447                 }
448                 break;
449         case cpu_to_le16(0):
450                 if (iftype != NL80211_IFTYPE_ADHOC &&
451                     iftype != NL80211_IFTYPE_STATION &&
452                     iftype != NL80211_IFTYPE_OCB)
453                                 return -1;
454                 break;
455         }
456 
457         if (!pskb_may_pull(skb, hdrlen + 8))
458                 return -1;
459 
460         payload = skb->data + hdrlen;
461         ethertype = (payload[6] << 8) | payload[7];
462 
463         if (likely((ether_addr_equal(payload, rfc1042_header) &&
464                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
465                    ether_addr_equal(payload, bridge_tunnel_header))) {
466                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
467                  * replace EtherType */
468                 skb_pull(skb, hdrlen + 6);
469                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
470                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
471         } else {
472                 struct ethhdr *ehdr;
473                 __be16 len;
474 
475                 skb_pull(skb, hdrlen);
476                 len = htons(skb->len);
477                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
478                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
479                 memcpy(ehdr->h_source, src, ETH_ALEN);
480                 ehdr->h_proto = len;
481         }
482         return 0;
483 }
484 EXPORT_SYMBOL(ieee80211_data_to_8023);
485 
486 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
487                              enum nl80211_iftype iftype,
488                              const u8 *bssid, bool qos)
489 {
490         struct ieee80211_hdr hdr;
491         u16 hdrlen, ethertype;
492         __le16 fc;
493         const u8 *encaps_data;
494         int encaps_len, skip_header_bytes;
495         int nh_pos, h_pos;
496         int head_need;
497 
498         if (unlikely(skb->len < ETH_HLEN))
499                 return -EINVAL;
500 
501         nh_pos = skb_network_header(skb) - skb->data;
502         h_pos = skb_transport_header(skb) - skb->data;
503 
504         /* convert Ethernet header to proper 802.11 header (based on
505          * operation mode) */
506         ethertype = (skb->data[12] << 8) | skb->data[13];
507         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
508 
509         switch (iftype) {
510         case NL80211_IFTYPE_AP:
511         case NL80211_IFTYPE_AP_VLAN:
512         case NL80211_IFTYPE_P2P_GO:
513                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
514                 /* DA BSSID SA */
515                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
516                 memcpy(hdr.addr2, addr, ETH_ALEN);
517                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
518                 hdrlen = 24;
519                 break;
520         case NL80211_IFTYPE_STATION:
521         case NL80211_IFTYPE_P2P_CLIENT:
522                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
523                 /* BSSID SA DA */
524                 memcpy(hdr.addr1, bssid, ETH_ALEN);
525                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
526                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
527                 hdrlen = 24;
528                 break;
529         case NL80211_IFTYPE_OCB:
530         case NL80211_IFTYPE_ADHOC:
531                 /* DA SA BSSID */
532                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
533                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
534                 memcpy(hdr.addr3, bssid, ETH_ALEN);
535                 hdrlen = 24;
536                 break;
537         default:
538                 return -EOPNOTSUPP;
539         }
540 
541         if (qos) {
542                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
543                 hdrlen += 2;
544         }
545 
546         hdr.frame_control = fc;
547         hdr.duration_id = 0;
548         hdr.seq_ctrl = 0;
549 
550         skip_header_bytes = ETH_HLEN;
551         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
552                 encaps_data = bridge_tunnel_header;
553                 encaps_len = sizeof(bridge_tunnel_header);
554                 skip_header_bytes -= 2;
555         } else if (ethertype >= ETH_P_802_3_MIN) {
556                 encaps_data = rfc1042_header;
557                 encaps_len = sizeof(rfc1042_header);
558                 skip_header_bytes -= 2;
559         } else {
560                 encaps_data = NULL;
561                 encaps_len = 0;
562         }
563 
564         skb_pull(skb, skip_header_bytes);
565         nh_pos -= skip_header_bytes;
566         h_pos -= skip_header_bytes;
567 
568         head_need = hdrlen + encaps_len - skb_headroom(skb);
569 
570         if (head_need > 0 || skb_cloned(skb)) {
571                 head_need = max(head_need, 0);
572                 if (head_need)
573                         skb_orphan(skb);
574 
575                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
576                         return -ENOMEM;
577 
578                 skb->truesize += head_need;
579         }
580 
581         if (encaps_data) {
582                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
583                 nh_pos += encaps_len;
584                 h_pos += encaps_len;
585         }
586 
587         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
588 
589         nh_pos += hdrlen;
590         h_pos += hdrlen;
591 
592         /* Update skb pointers to various headers since this modified frame
593          * is going to go through Linux networking code that may potentially
594          * need things like pointer to IP header. */
595         skb_set_mac_header(skb, 0);
596         skb_set_network_header(skb, nh_pos);
597         skb_set_transport_header(skb, h_pos);
598 
599         return 0;
600 }
601 EXPORT_SYMBOL(ieee80211_data_from_8023);
602 
603 
604 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
605                               const u8 *addr, enum nl80211_iftype iftype,
606                               const unsigned int extra_headroom,
607                               bool has_80211_header)
608 {
609         struct sk_buff *frame = NULL;
610         u16 ethertype;
611         u8 *payload;
612         const struct ethhdr *eth;
613         int remaining, err;
614         u8 dst[ETH_ALEN], src[ETH_ALEN];
615 
616         if (has_80211_header) {
617                 err = ieee80211_data_to_8023(skb, addr, iftype);
618                 if (err)
619                         goto out;
620 
621                 /* skip the wrapping header */
622                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
623                 if (!eth)
624                         goto out;
625         } else {
626                 eth = (struct ethhdr *) skb->data;
627         }
628 
629         while (skb != frame) {
630                 u8 padding;
631                 __be16 len = eth->h_proto;
632                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
633 
634                 remaining = skb->len;
635                 memcpy(dst, eth->h_dest, ETH_ALEN);
636                 memcpy(src, eth->h_source, ETH_ALEN);
637 
638                 padding = (4 - subframe_len) & 0x3;
639                 /* the last MSDU has no padding */
640                 if (subframe_len > remaining)
641                         goto purge;
642 
643                 skb_pull(skb, sizeof(struct ethhdr));
644                 /* reuse skb for the last subframe */
645                 if (remaining <= subframe_len + padding)
646                         frame = skb;
647                 else {
648                         unsigned int hlen = ALIGN(extra_headroom, 4);
649                         /*
650                          * Allocate and reserve two bytes more for payload
651                          * alignment since sizeof(struct ethhdr) is 14.
652                          */
653                         frame = dev_alloc_skb(hlen + subframe_len + 2);
654                         if (!frame)
655                                 goto purge;
656 
657                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
658                         memcpy(skb_put(frame, ntohs(len)), skb->data,
659                                 ntohs(len));
660 
661                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
662                                                         padding);
663                         if (!eth) {
664                                 dev_kfree_skb(frame);
665                                 goto purge;
666                         }
667                 }
668 
669                 skb_reset_network_header(frame);
670                 frame->dev = skb->dev;
671                 frame->priority = skb->priority;
672 
673                 payload = frame->data;
674                 ethertype = (payload[6] << 8) | payload[7];
675 
676                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
677                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
678                            ether_addr_equal(payload, bridge_tunnel_header))) {
679                         /* remove RFC1042 or Bridge-Tunnel
680                          * encapsulation and replace EtherType */
681                         skb_pull(frame, 6);
682                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
683                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
684                 } else {
685                         memcpy(skb_push(frame, sizeof(__be16)), &len,
686                                 sizeof(__be16));
687                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
688                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
689                 }
690                 __skb_queue_tail(list, frame);
691         }
692 
693         return;
694 
695  purge:
696         __skb_queue_purge(list);
697  out:
698         dev_kfree_skb(skb);
699 }
700 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
701 
702 /* Given a data frame determine the 802.1p/1d tag to use. */
703 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
704                                     struct cfg80211_qos_map *qos_map)
705 {
706         unsigned int dscp;
707         unsigned char vlan_priority;
708 
709         /* skb->priority values from 256->263 are magic values to
710          * directly indicate a specific 802.1d priority.  This is used
711          * to allow 802.1d priority to be passed directly in from VLAN
712          * tags, etc.
713          */
714         if (skb->priority >= 256 && skb->priority <= 263)
715                 return skb->priority - 256;
716 
717         if (vlan_tx_tag_present(skb)) {
718                 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
719                         >> VLAN_PRIO_SHIFT;
720                 if (vlan_priority > 0)
721                         return vlan_priority;
722         }
723 
724         switch (skb->protocol) {
725         case htons(ETH_P_IP):
726                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
727                 break;
728         case htons(ETH_P_IPV6):
729                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
730                 break;
731         case htons(ETH_P_MPLS_UC):
732         case htons(ETH_P_MPLS_MC): {
733                 struct mpls_label mpls_tmp, *mpls;
734 
735                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
736                                           sizeof(*mpls), &mpls_tmp);
737                 if (!mpls)
738                         return 0;
739 
740                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
741                         >> MPLS_LS_TC_SHIFT;
742         }
743         case htons(ETH_P_80221):
744                 /* 802.21 is always network control traffic */
745                 return 7;
746         default:
747                 return 0;
748         }
749 
750         if (qos_map) {
751                 unsigned int i, tmp_dscp = dscp >> 2;
752 
753                 for (i = 0; i < qos_map->num_des; i++) {
754                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
755                                 return qos_map->dscp_exception[i].up;
756                 }
757 
758                 for (i = 0; i < 8; i++) {
759                         if (tmp_dscp >= qos_map->up[i].low &&
760                             tmp_dscp <= qos_map->up[i].high)
761                                 return i;
762                 }
763         }
764 
765         return dscp >> 5;
766 }
767 EXPORT_SYMBOL(cfg80211_classify8021d);
768 
769 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
770 {
771         const struct cfg80211_bss_ies *ies;
772 
773         ies = rcu_dereference(bss->ies);
774         if (!ies)
775                 return NULL;
776 
777         return cfg80211_find_ie(ie, ies->data, ies->len);
778 }
779 EXPORT_SYMBOL(ieee80211_bss_get_ie);
780 
781 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
782 {
783         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
784         struct net_device *dev = wdev->netdev;
785         int i;
786 
787         if (!wdev->connect_keys)
788                 return;
789 
790         for (i = 0; i < 6; i++) {
791                 if (!wdev->connect_keys->params[i].cipher)
792                         continue;
793                 if (rdev_add_key(rdev, dev, i, false, NULL,
794                                  &wdev->connect_keys->params[i])) {
795                         netdev_err(dev, "failed to set key %d\n", i);
796                         continue;
797                 }
798                 if (wdev->connect_keys->def == i)
799                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
800                                 netdev_err(dev, "failed to set defkey %d\n", i);
801                                 continue;
802                         }
803                 if (wdev->connect_keys->defmgmt == i)
804                         if (rdev_set_default_mgmt_key(rdev, dev, i))
805                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
806         }
807 
808         kzfree(wdev->connect_keys);
809         wdev->connect_keys = NULL;
810 }
811 
812 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
813 {
814         struct cfg80211_event *ev;
815         unsigned long flags;
816         const u8 *bssid = NULL;
817 
818         spin_lock_irqsave(&wdev->event_lock, flags);
819         while (!list_empty(&wdev->event_list)) {
820                 ev = list_first_entry(&wdev->event_list,
821                                       struct cfg80211_event, list);
822                 list_del(&ev->list);
823                 spin_unlock_irqrestore(&wdev->event_lock, flags);
824 
825                 wdev_lock(wdev);
826                 switch (ev->type) {
827                 case EVENT_CONNECT_RESULT:
828                         if (!is_zero_ether_addr(ev->cr.bssid))
829                                 bssid = ev->cr.bssid;
830                         __cfg80211_connect_result(
831                                 wdev->netdev, bssid,
832                                 ev->cr.req_ie, ev->cr.req_ie_len,
833                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
834                                 ev->cr.status,
835                                 ev->cr.status == WLAN_STATUS_SUCCESS,
836                                 NULL);
837                         break;
838                 case EVENT_ROAMED:
839                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
840                                           ev->rm.req_ie_len, ev->rm.resp_ie,
841                                           ev->rm.resp_ie_len);
842                         break;
843                 case EVENT_DISCONNECTED:
844                         __cfg80211_disconnected(wdev->netdev,
845                                                 ev->dc.ie, ev->dc.ie_len,
846                                                 ev->dc.reason, true);
847                         break;
848                 case EVENT_IBSS_JOINED:
849                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
850                                                ev->ij.channel);
851                         break;
852                 case EVENT_STOPPED:
853                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
854                         break;
855                 }
856                 wdev_unlock(wdev);
857 
858                 kfree(ev);
859 
860                 spin_lock_irqsave(&wdev->event_lock, flags);
861         }
862         spin_unlock_irqrestore(&wdev->event_lock, flags);
863 }
864 
865 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
866 {
867         struct wireless_dev *wdev;
868 
869         ASSERT_RTNL();
870 
871         list_for_each_entry(wdev, &rdev->wdev_list, list)
872                 cfg80211_process_wdev_events(wdev);
873 }
874 
875 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
876                           struct net_device *dev, enum nl80211_iftype ntype,
877                           u32 *flags, struct vif_params *params)
878 {
879         int err;
880         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
881 
882         ASSERT_RTNL();
883 
884         /* don't support changing VLANs, you just re-create them */
885         if (otype == NL80211_IFTYPE_AP_VLAN)
886                 return -EOPNOTSUPP;
887 
888         /* cannot change into P2P device type */
889         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
890                 return -EOPNOTSUPP;
891 
892         if (!rdev->ops->change_virtual_intf ||
893             !(rdev->wiphy.interface_modes & (1 << ntype)))
894                 return -EOPNOTSUPP;
895 
896         /* if it's part of a bridge, reject changing type to station/ibss */
897         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
898             (ntype == NL80211_IFTYPE_ADHOC ||
899              ntype == NL80211_IFTYPE_STATION ||
900              ntype == NL80211_IFTYPE_P2P_CLIENT))
901                 return -EBUSY;
902 
903         if (ntype != otype && netif_running(dev)) {
904                 dev->ieee80211_ptr->use_4addr = false;
905                 dev->ieee80211_ptr->mesh_id_up_len = 0;
906                 wdev_lock(dev->ieee80211_ptr);
907                 rdev_set_qos_map(rdev, dev, NULL);
908                 wdev_unlock(dev->ieee80211_ptr);
909 
910                 switch (otype) {
911                 case NL80211_IFTYPE_AP:
912                         cfg80211_stop_ap(rdev, dev, true);
913                         break;
914                 case NL80211_IFTYPE_ADHOC:
915                         cfg80211_leave_ibss(rdev, dev, false);
916                         break;
917                 case NL80211_IFTYPE_STATION:
918                 case NL80211_IFTYPE_P2P_CLIENT:
919                         wdev_lock(dev->ieee80211_ptr);
920                         cfg80211_disconnect(rdev, dev,
921                                             WLAN_REASON_DEAUTH_LEAVING, true);
922                         wdev_unlock(dev->ieee80211_ptr);
923                         break;
924                 case NL80211_IFTYPE_MESH_POINT:
925                         /* mesh should be handled? */
926                         break;
927                 default:
928                         break;
929                 }
930 
931                 cfg80211_process_rdev_events(rdev);
932         }
933 
934         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
935 
936         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
937 
938         if (!err && params && params->use_4addr != -1)
939                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
940 
941         if (!err) {
942                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
943                 switch (ntype) {
944                 case NL80211_IFTYPE_STATION:
945                         if (dev->ieee80211_ptr->use_4addr)
946                                 break;
947                         /* fall through */
948                 case NL80211_IFTYPE_OCB:
949                 case NL80211_IFTYPE_P2P_CLIENT:
950                 case NL80211_IFTYPE_ADHOC:
951                         dev->priv_flags |= IFF_DONT_BRIDGE;
952                         break;
953                 case NL80211_IFTYPE_P2P_GO:
954                 case NL80211_IFTYPE_AP:
955                 case NL80211_IFTYPE_AP_VLAN:
956                 case NL80211_IFTYPE_WDS:
957                 case NL80211_IFTYPE_MESH_POINT:
958                         /* bridging OK */
959                         break;
960                 case NL80211_IFTYPE_MONITOR:
961                         /* monitor can't bridge anyway */
962                         break;
963                 case NL80211_IFTYPE_UNSPECIFIED:
964                 case NUM_NL80211_IFTYPES:
965                         /* not happening */
966                         break;
967                 case NL80211_IFTYPE_P2P_DEVICE:
968                         WARN_ON(1);
969                         break;
970                 }
971         }
972 
973         if (!err && ntype != otype && netif_running(dev)) {
974                 cfg80211_update_iface_num(rdev, ntype, 1);
975                 cfg80211_update_iface_num(rdev, otype, -1);
976         }
977 
978         return err;
979 }
980 
981 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
982 {
983         static const u32 __mcs2bitrate[] = {
984                 /* control PHY */
985                 [0] =   275,
986                 /* SC PHY */
987                 [1] =  3850,
988                 [2] =  7700,
989                 [3] =  9625,
990                 [4] = 11550,
991                 [5] = 12512, /* 1251.25 mbps */
992                 [6] = 15400,
993                 [7] = 19250,
994                 [8] = 23100,
995                 [9] = 25025,
996                 [10] = 30800,
997                 [11] = 38500,
998                 [12] = 46200,
999                 /* OFDM PHY */
1000                 [13] =  6930,
1001                 [14] =  8662, /* 866.25 mbps */
1002                 [15] = 13860,
1003                 [16] = 17325,
1004                 [17] = 20790,
1005                 [18] = 27720,
1006                 [19] = 34650,
1007                 [20] = 41580,
1008                 [21] = 45045,
1009                 [22] = 51975,
1010                 [23] = 62370,
1011                 [24] = 67568, /* 6756.75 mbps */
1012                 /* LP-SC PHY */
1013                 [25] =  6260,
1014                 [26] =  8340,
1015                 [27] = 11120,
1016                 [28] = 12510,
1017                 [29] = 16680,
1018                 [30] = 22240,
1019                 [31] = 25030,
1020         };
1021 
1022         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1023                 return 0;
1024 
1025         return __mcs2bitrate[rate->mcs];
1026 }
1027 
1028 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1029 {
1030         static const u32 base[4][10] = {
1031                 {   6500000,
1032                    13000000,
1033                    19500000,
1034                    26000000,
1035                    39000000,
1036                    52000000,
1037                    58500000,
1038                    65000000,
1039                    78000000,
1040                    0,
1041                 },
1042                 {  13500000,
1043                    27000000,
1044                    40500000,
1045                    54000000,
1046                    81000000,
1047                   108000000,
1048                   121500000,
1049                   135000000,
1050                   162000000,
1051                   180000000,
1052                 },
1053                 {  29300000,
1054                    58500000,
1055                    87800000,
1056                   117000000,
1057                   175500000,
1058                   234000000,
1059                   263300000,
1060                   292500000,
1061                   351000000,
1062                   390000000,
1063                 },
1064                 {  58500000,
1065                   117000000,
1066                   175500000,
1067                   234000000,
1068                   351000000,
1069                   468000000,
1070                   526500000,
1071                   585000000,
1072                   702000000,
1073                   780000000,
1074                 },
1075         };
1076         u32 bitrate;
1077         int idx;
1078 
1079         if (WARN_ON_ONCE(rate->mcs > 9))
1080                 return 0;
1081 
1082         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1083                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1084                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1085                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1086 
1087         bitrate = base[idx][rate->mcs];
1088         bitrate *= rate->nss;
1089 
1090         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1091                 bitrate = (bitrate / 9) * 10;
1092 
1093         /* do NOT round down here */
1094         return (bitrate + 50000) / 100000;
1095 }
1096 
1097 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1098 {
1099         int modulation, streams, bitrate;
1100 
1101         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1102             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1103                 return rate->legacy;
1104         if (rate->flags & RATE_INFO_FLAGS_60G)
1105                 return cfg80211_calculate_bitrate_60g(rate);
1106         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1107                 return cfg80211_calculate_bitrate_vht(rate);
1108 
1109         /* the formula below does only work for MCS values smaller than 32 */
1110         if (WARN_ON_ONCE(rate->mcs >= 32))
1111                 return 0;
1112 
1113         modulation = rate->mcs & 7;
1114         streams = (rate->mcs >> 3) + 1;
1115 
1116         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1117                         13500000 : 6500000;
1118 
1119         if (modulation < 4)
1120                 bitrate *= (modulation + 1);
1121         else if (modulation == 4)
1122                 bitrate *= (modulation + 2);
1123         else
1124                 bitrate *= (modulation + 3);
1125 
1126         bitrate *= streams;
1127 
1128         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1129                 bitrate = (bitrate / 9) * 10;
1130 
1131         /* do NOT round down here */
1132         return (bitrate + 50000) / 100000;
1133 }
1134 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1135 
1136 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1137                           enum ieee80211_p2p_attr_id attr,
1138                           u8 *buf, unsigned int bufsize)
1139 {
1140         u8 *out = buf;
1141         u16 attr_remaining = 0;
1142         bool desired_attr = false;
1143         u16 desired_len = 0;
1144 
1145         while (len > 0) {
1146                 unsigned int iedatalen;
1147                 unsigned int copy;
1148                 const u8 *iedata;
1149 
1150                 if (len < 2)
1151                         return -EILSEQ;
1152                 iedatalen = ies[1];
1153                 if (iedatalen + 2 > len)
1154                         return -EILSEQ;
1155 
1156                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1157                         goto cont;
1158 
1159                 if (iedatalen < 4)
1160                         goto cont;
1161 
1162                 iedata = ies + 2;
1163 
1164                 /* check WFA OUI, P2P subtype */
1165                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1166                     iedata[2] != 0x9a || iedata[3] != 0x09)
1167                         goto cont;
1168 
1169                 iedatalen -= 4;
1170                 iedata += 4;
1171 
1172                 /* check attribute continuation into this IE */
1173                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1174                 if (copy && desired_attr) {
1175                         desired_len += copy;
1176                         if (out) {
1177                                 memcpy(out, iedata, min(bufsize, copy));
1178                                 out += min(bufsize, copy);
1179                                 bufsize -= min(bufsize, copy);
1180                         }
1181 
1182 
1183                         if (copy == attr_remaining)
1184                                 return desired_len;
1185                 }
1186 
1187                 attr_remaining -= copy;
1188                 if (attr_remaining)
1189                         goto cont;
1190 
1191                 iedatalen -= copy;
1192                 iedata += copy;
1193 
1194                 while (iedatalen > 0) {
1195                         u16 attr_len;
1196 
1197                         /* P2P attribute ID & size must fit */
1198                         if (iedatalen < 3)
1199                                 return -EILSEQ;
1200                         desired_attr = iedata[0] == attr;
1201                         attr_len = get_unaligned_le16(iedata + 1);
1202                         iedatalen -= 3;
1203                         iedata += 3;
1204 
1205                         copy = min_t(unsigned int, attr_len, iedatalen);
1206 
1207                         if (desired_attr) {
1208                                 desired_len += copy;
1209                                 if (out) {
1210                                         memcpy(out, iedata, min(bufsize, copy));
1211                                         out += min(bufsize, copy);
1212                                         bufsize -= min(bufsize, copy);
1213                                 }
1214 
1215                                 if (copy == attr_len)
1216                                         return desired_len;
1217                         }
1218 
1219                         iedata += copy;
1220                         iedatalen -= copy;
1221                         attr_remaining = attr_len - copy;
1222                 }
1223 
1224  cont:
1225                 len -= ies[1] + 2;
1226                 ies += ies[1] + 2;
1227         }
1228 
1229         if (attr_remaining && desired_attr)
1230                 return -EILSEQ;
1231 
1232         return -ENOENT;
1233 }
1234 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1235 
1236 bool ieee80211_operating_class_to_band(u8 operating_class,
1237                                        enum ieee80211_band *band)
1238 {
1239         switch (operating_class) {
1240         case 112:
1241         case 115 ... 127:
1242                 *band = IEEE80211_BAND_5GHZ;
1243                 return true;
1244         case 81:
1245         case 82:
1246         case 83:
1247         case 84:
1248                 *band = IEEE80211_BAND_2GHZ;
1249                 return true;
1250         case 180:
1251                 *band = IEEE80211_BAND_60GHZ;
1252                 return true;
1253         }
1254 
1255         return false;
1256 }
1257 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1258 
1259 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1260                                  u32 beacon_int)
1261 {
1262         struct wireless_dev *wdev;
1263         int res = 0;
1264 
1265         if (!beacon_int)
1266                 return -EINVAL;
1267 
1268         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1269                 if (!wdev->beacon_interval)
1270                         continue;
1271                 if (wdev->beacon_interval != beacon_int) {
1272                         res = -EINVAL;
1273                         break;
1274                 }
1275         }
1276 
1277         return res;
1278 }
1279 
1280 int cfg80211_iter_combinations(struct wiphy *wiphy,
1281                                const int num_different_channels,
1282                                const u8 radar_detect,
1283                                const int iftype_num[NUM_NL80211_IFTYPES],
1284                                void (*iter)(const struct ieee80211_iface_combination *c,
1285                                             void *data),
1286                                void *data)
1287 {
1288         const struct ieee80211_regdomain *regdom;
1289         enum nl80211_dfs_regions region = 0;
1290         int i, j, iftype;
1291         int num_interfaces = 0;
1292         u32 used_iftypes = 0;
1293 
1294         if (radar_detect) {
1295                 rcu_read_lock();
1296                 regdom = rcu_dereference(cfg80211_regdomain);
1297                 if (regdom)
1298                         region = regdom->dfs_region;
1299                 rcu_read_unlock();
1300         }
1301 
1302         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1303                 num_interfaces += iftype_num[iftype];
1304                 if (iftype_num[iftype] > 0 &&
1305                     !(wiphy->software_iftypes & BIT(iftype)))
1306                         used_iftypes |= BIT(iftype);
1307         }
1308 
1309         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1310                 const struct ieee80211_iface_combination *c;
1311                 struct ieee80211_iface_limit *limits;
1312                 u32 all_iftypes = 0;
1313 
1314                 c = &wiphy->iface_combinations[i];
1315 
1316                 if (num_interfaces > c->max_interfaces)
1317                         continue;
1318                 if (num_different_channels > c->num_different_channels)
1319                         continue;
1320 
1321                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1322                                  GFP_KERNEL);
1323                 if (!limits)
1324                         return -ENOMEM;
1325 
1326                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1327                         if (wiphy->software_iftypes & BIT(iftype))
1328                                 continue;
1329                         for (j = 0; j < c->n_limits; j++) {
1330                                 all_iftypes |= limits[j].types;
1331                                 if (!(limits[j].types & BIT(iftype)))
1332                                         continue;
1333                                 if (limits[j].max < iftype_num[iftype])
1334                                         goto cont;
1335                                 limits[j].max -= iftype_num[iftype];
1336                         }
1337                 }
1338 
1339                 if (radar_detect != (c->radar_detect_widths & radar_detect))
1340                         goto cont;
1341 
1342                 if (radar_detect && c->radar_detect_regions &&
1343                     !(c->radar_detect_regions & BIT(region)))
1344                         goto cont;
1345 
1346                 /* Finally check that all iftypes that we're currently
1347                  * using are actually part of this combination. If they
1348                  * aren't then we can't use this combination and have
1349                  * to continue to the next.
1350                  */
1351                 if ((all_iftypes & used_iftypes) != used_iftypes)
1352                         goto cont;
1353 
1354                 /* This combination covered all interface types and
1355                  * supported the requested numbers, so we're good.
1356                  */
1357 
1358                 (*iter)(c, data);
1359  cont:
1360                 kfree(limits);
1361         }
1362 
1363         return 0;
1364 }
1365 EXPORT_SYMBOL(cfg80211_iter_combinations);
1366 
1367 static void
1368 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1369                           void *data)
1370 {
1371         int *num = data;
1372         (*num)++;
1373 }
1374 
1375 int cfg80211_check_combinations(struct wiphy *wiphy,
1376                                 const int num_different_channels,
1377                                 const u8 radar_detect,
1378                                 const int iftype_num[NUM_NL80211_IFTYPES])
1379 {
1380         int err, num = 0;
1381 
1382         err = cfg80211_iter_combinations(wiphy, num_different_channels,
1383                                          radar_detect, iftype_num,
1384                                          cfg80211_iter_sum_ifcombs, &num);
1385         if (err)
1386                 return err;
1387         if (num == 0)
1388                 return -EBUSY;
1389 
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(cfg80211_check_combinations);
1393 
1394 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1395                                  struct wireless_dev *wdev,
1396                                  enum nl80211_iftype iftype,
1397                                  struct ieee80211_channel *chan,
1398                                  enum cfg80211_chan_mode chanmode,
1399                                  u8 radar_detect)
1400 {
1401         struct wireless_dev *wdev_iter;
1402         int num[NUM_NL80211_IFTYPES];
1403         struct ieee80211_channel
1404                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1405         struct ieee80211_channel *ch;
1406         enum cfg80211_chan_mode chmode;
1407         int num_different_channels = 0;
1408         int total = 1;
1409         int i;
1410 
1411         ASSERT_RTNL();
1412 
1413         if (WARN_ON(hweight32(radar_detect) > 1))
1414                 return -EINVAL;
1415 
1416         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1417                 return -EINVAL;
1418 
1419         /* Always allow software iftypes */
1420         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1421                 if (radar_detect)
1422                         return -EINVAL;
1423                 return 0;
1424         }
1425 
1426         memset(num, 0, sizeof(num));
1427         memset(used_channels, 0, sizeof(used_channels));
1428 
1429         num[iftype] = 1;
1430 
1431         /* TODO: We'll probably not need this anymore, since this
1432          * should only be called with CHAN_MODE_UNDEFINED. There are
1433          * still a couple of pending calls where other chanmodes are
1434          * used, but we should get rid of them.
1435          */
1436         switch (chanmode) {
1437         case CHAN_MODE_UNDEFINED:
1438                 break;
1439         case CHAN_MODE_SHARED:
1440                 WARN_ON(!chan);
1441                 used_channels[0] = chan;
1442                 num_different_channels++;
1443                 break;
1444         case CHAN_MODE_EXCLUSIVE:
1445                 num_different_channels++;
1446                 break;
1447         }
1448 
1449         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1450                 if (wdev_iter == wdev)
1451                         continue;
1452                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1453                         if (!wdev_iter->p2p_started)
1454                                 continue;
1455                 } else if (wdev_iter->netdev) {
1456                         if (!netif_running(wdev_iter->netdev))
1457                                 continue;
1458                 } else {
1459                         WARN_ON(1);
1460                 }
1461 
1462                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1463                         continue;
1464 
1465                 /*
1466                  * We may be holding the "wdev" mutex, but now need to lock
1467                  * wdev_iter. This is OK because once we get here wdev_iter
1468                  * is not wdev (tested above), but we need to use the nested
1469                  * locking for lockdep.
1470                  */
1471                 mutex_lock_nested(&wdev_iter->mtx, 1);
1472                 __acquire(wdev_iter->mtx);
1473                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1474                 wdev_unlock(wdev_iter);
1475 
1476                 switch (chmode) {
1477                 case CHAN_MODE_UNDEFINED:
1478                         break;
1479                 case CHAN_MODE_SHARED:
1480                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1481                                 if (!used_channels[i] || used_channels[i] == ch)
1482                                         break;
1483 
1484                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1485                                 return -EBUSY;
1486 
1487                         if (used_channels[i] == NULL) {
1488                                 used_channels[i] = ch;
1489                                 num_different_channels++;
1490                         }
1491                         break;
1492                 case CHAN_MODE_EXCLUSIVE:
1493                         num_different_channels++;
1494                         break;
1495                 }
1496 
1497                 num[wdev_iter->iftype]++;
1498                 total++;
1499         }
1500 
1501         if (total == 1 && !radar_detect)
1502                 return 0;
1503 
1504         return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
1505                                            radar_detect, num);
1506 }
1507 
1508 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1509                            const u8 *rates, unsigned int n_rates,
1510                            u32 *mask)
1511 {
1512         int i, j;
1513 
1514         if (!sband)
1515                 return -EINVAL;
1516 
1517         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1518                 return -EINVAL;
1519 
1520         *mask = 0;
1521 
1522         for (i = 0; i < n_rates; i++) {
1523                 int rate = (rates[i] & 0x7f) * 5;
1524                 bool found = false;
1525 
1526                 for (j = 0; j < sband->n_bitrates; j++) {
1527                         if (sband->bitrates[j].bitrate == rate) {
1528                                 found = true;
1529                                 *mask |= BIT(j);
1530                                 break;
1531                         }
1532                 }
1533                 if (!found)
1534                         return -EINVAL;
1535         }
1536 
1537         /*
1538          * mask must have at least one bit set here since we
1539          * didn't accept a 0-length rates array nor allowed
1540          * entries in the array that didn't exist
1541          */
1542 
1543         return 0;
1544 }
1545 
1546 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1547 {
1548         enum ieee80211_band band;
1549         unsigned int n_channels = 0;
1550 
1551         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1552                 if (wiphy->bands[band])
1553                         n_channels += wiphy->bands[band]->n_channels;
1554 
1555         return n_channels;
1556 }
1557 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1558 
1559 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1560                          struct station_info *sinfo)
1561 {
1562         struct cfg80211_registered_device *rdev;
1563         struct wireless_dev *wdev;
1564 
1565         wdev = dev->ieee80211_ptr;
1566         if (!wdev)
1567                 return -EOPNOTSUPP;
1568 
1569         rdev = wiphy_to_rdev(wdev->wiphy);
1570         if (!rdev->ops->get_station)
1571                 return -EOPNOTSUPP;
1572 
1573         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1574 }
1575 EXPORT_SYMBOL(cfg80211_get_station);
1576 
1577 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1578 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1579 const unsigned char rfc1042_header[] __aligned(2) =
1580         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1581 EXPORT_SYMBOL(rfc1042_header);
1582 
1583 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1584 const unsigned char bridge_tunnel_header[] __aligned(2) =
1585         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1586 EXPORT_SYMBOL(bridge_tunnel_header);
1587 

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