Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 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

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, u8 *bssid, bool qos)
480 {
481         struct ieee80211_hdr hdr;
482         u16 hdrlen, ethertype;
483         __le16 fc;
484         const u8 *encaps_data;
485         int encaps_len, skip_header_bytes;
486         int nh_pos, h_pos;
487         int head_need;
488 
489         if (unlikely(skb->len < ETH_HLEN))
490                 return -EINVAL;
491 
492         nh_pos = skb_network_header(skb) - skb->data;
493         h_pos = skb_transport_header(skb) - skb->data;
494 
495         /* convert Ethernet header to proper 802.11 header (based on
496          * operation mode) */
497         ethertype = (skb->data[12] << 8) | skb->data[13];
498         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
499 
500         switch (iftype) {
501         case NL80211_IFTYPE_AP:
502         case NL80211_IFTYPE_AP_VLAN:
503         case NL80211_IFTYPE_P2P_GO:
504                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
505                 /* DA BSSID SA */
506                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
507                 memcpy(hdr.addr2, addr, ETH_ALEN);
508                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
509                 hdrlen = 24;
510                 break;
511         case NL80211_IFTYPE_STATION:
512         case NL80211_IFTYPE_P2P_CLIENT:
513                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
514                 /* BSSID SA DA */
515                 memcpy(hdr.addr1, bssid, ETH_ALEN);
516                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
517                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
518                 hdrlen = 24;
519                 break;
520         case NL80211_IFTYPE_ADHOC:
521                 /* DA SA BSSID */
522                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
523                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
524                 memcpy(hdr.addr3, bssid, ETH_ALEN);
525                 hdrlen = 24;
526                 break;
527         default:
528                 return -EOPNOTSUPP;
529         }
530 
531         if (qos) {
532                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
533                 hdrlen += 2;
534         }
535 
536         hdr.frame_control = fc;
537         hdr.duration_id = 0;
538         hdr.seq_ctrl = 0;
539 
540         skip_header_bytes = ETH_HLEN;
541         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
542                 encaps_data = bridge_tunnel_header;
543                 encaps_len = sizeof(bridge_tunnel_header);
544                 skip_header_bytes -= 2;
545         } else if (ethertype >= ETH_P_802_3_MIN) {
546                 encaps_data = rfc1042_header;
547                 encaps_len = sizeof(rfc1042_header);
548                 skip_header_bytes -= 2;
549         } else {
550                 encaps_data = NULL;
551                 encaps_len = 0;
552         }
553 
554         skb_pull(skb, skip_header_bytes);
555         nh_pos -= skip_header_bytes;
556         h_pos -= skip_header_bytes;
557 
558         head_need = hdrlen + encaps_len - skb_headroom(skb);
559 
560         if (head_need > 0 || skb_cloned(skb)) {
561                 head_need = max(head_need, 0);
562                 if (head_need)
563                         skb_orphan(skb);
564 
565                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
566                         return -ENOMEM;
567 
568                 skb->truesize += head_need;
569         }
570 
571         if (encaps_data) {
572                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
573                 nh_pos += encaps_len;
574                 h_pos += encaps_len;
575         }
576 
577         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
578 
579         nh_pos += hdrlen;
580         h_pos += hdrlen;
581 
582         /* Update skb pointers to various headers since this modified frame
583          * is going to go through Linux networking code that may potentially
584          * need things like pointer to IP header. */
585         skb_set_mac_header(skb, 0);
586         skb_set_network_header(skb, nh_pos);
587         skb_set_transport_header(skb, h_pos);
588 
589         return 0;
590 }
591 EXPORT_SYMBOL(ieee80211_data_from_8023);
592 
593 
594 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
595                               const u8 *addr, enum nl80211_iftype iftype,
596                               const unsigned int extra_headroom,
597                               bool has_80211_header)
598 {
599         struct sk_buff *frame = NULL;
600         u16 ethertype;
601         u8 *payload;
602         const struct ethhdr *eth;
603         int remaining, err;
604         u8 dst[ETH_ALEN], src[ETH_ALEN];
605 
606         if (has_80211_header) {
607                 err = ieee80211_data_to_8023(skb, addr, iftype);
608                 if (err)
609                         goto out;
610 
611                 /* skip the wrapping header */
612                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
613                 if (!eth)
614                         goto out;
615         } else {
616                 eth = (struct ethhdr *) skb->data;
617         }
618 
619         while (skb != frame) {
620                 u8 padding;
621                 __be16 len = eth->h_proto;
622                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
623 
624                 remaining = skb->len;
625                 memcpy(dst, eth->h_dest, ETH_ALEN);
626                 memcpy(src, eth->h_source, ETH_ALEN);
627 
628                 padding = (4 - subframe_len) & 0x3;
629                 /* the last MSDU has no padding */
630                 if (subframe_len > remaining)
631                         goto purge;
632 
633                 skb_pull(skb, sizeof(struct ethhdr));
634                 /* reuse skb for the last subframe */
635                 if (remaining <= subframe_len + padding)
636                         frame = skb;
637                 else {
638                         unsigned int hlen = ALIGN(extra_headroom, 4);
639                         /*
640                          * Allocate and reserve two bytes more for payload
641                          * alignment since sizeof(struct ethhdr) is 14.
642                          */
643                         frame = dev_alloc_skb(hlen + subframe_len + 2);
644                         if (!frame)
645                                 goto purge;
646 
647                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
648                         memcpy(skb_put(frame, ntohs(len)), skb->data,
649                                 ntohs(len));
650 
651                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
652                                                         padding);
653                         if (!eth) {
654                                 dev_kfree_skb(frame);
655                                 goto purge;
656                         }
657                 }
658 
659                 skb_reset_network_header(frame);
660                 frame->dev = skb->dev;
661                 frame->priority = skb->priority;
662 
663                 payload = frame->data;
664                 ethertype = (payload[6] << 8) | payload[7];
665 
666                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
667                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
668                            ether_addr_equal(payload, bridge_tunnel_header))) {
669                         /* remove RFC1042 or Bridge-Tunnel
670                          * encapsulation and replace EtherType */
671                         skb_pull(frame, 6);
672                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
673                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
674                 } else {
675                         memcpy(skb_push(frame, sizeof(__be16)), &len,
676                                 sizeof(__be16));
677                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
678                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
679                 }
680                 __skb_queue_tail(list, frame);
681         }
682 
683         return;
684 
685  purge:
686         __skb_queue_purge(list);
687  out:
688         dev_kfree_skb(skb);
689 }
690 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
691 
692 /* Given a data frame determine the 802.1p/1d tag to use. */
693 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
694                                     struct cfg80211_qos_map *qos_map)
695 {
696         unsigned int dscp;
697         unsigned char vlan_priority;
698 
699         /* skb->priority values from 256->263 are magic values to
700          * directly indicate a specific 802.1d priority.  This is used
701          * to allow 802.1d priority to be passed directly in from VLAN
702          * tags, etc.
703          */
704         if (skb->priority >= 256 && skb->priority <= 263)
705                 return skb->priority - 256;
706 
707         if (vlan_tx_tag_present(skb)) {
708                 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
709                         >> VLAN_PRIO_SHIFT;
710                 if (vlan_priority > 0)
711                         return vlan_priority;
712         }
713 
714         switch (skb->protocol) {
715         case htons(ETH_P_IP):
716                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
717                 break;
718         case htons(ETH_P_IPV6):
719                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
720                 break;
721         case htons(ETH_P_MPLS_UC):
722         case htons(ETH_P_MPLS_MC): {
723                 struct mpls_label mpls_tmp, *mpls;
724 
725                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
726                                           sizeof(*mpls), &mpls_tmp);
727                 if (!mpls)
728                         return 0;
729 
730                 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
731                         >> MPLS_LS_TC_SHIFT;
732         }
733         case htons(ETH_P_80221):
734                 /* 802.21 is always network control traffic */
735                 return 7;
736         default:
737                 return 0;
738         }
739 
740         if (qos_map) {
741                 unsigned int i, tmp_dscp = dscp >> 2;
742 
743                 for (i = 0; i < qos_map->num_des; i++) {
744                         if (tmp_dscp == qos_map->dscp_exception[i].dscp)
745                                 return qos_map->dscp_exception[i].up;
746                 }
747 
748                 for (i = 0; i < 8; i++) {
749                         if (tmp_dscp >= qos_map->up[i].low &&
750                             tmp_dscp <= qos_map->up[i].high)
751                                 return i;
752                 }
753         }
754 
755         return dscp >> 5;
756 }
757 EXPORT_SYMBOL(cfg80211_classify8021d);
758 
759 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
760 {
761         const struct cfg80211_bss_ies *ies;
762 
763         ies = rcu_dereference(bss->ies);
764         if (!ies)
765                 return NULL;
766 
767         return cfg80211_find_ie(ie, ies->data, ies->len);
768 }
769 EXPORT_SYMBOL(ieee80211_bss_get_ie);
770 
771 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
772 {
773         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
774         struct net_device *dev = wdev->netdev;
775         int i;
776 
777         if (!wdev->connect_keys)
778                 return;
779 
780         for (i = 0; i < 6; i++) {
781                 if (!wdev->connect_keys->params[i].cipher)
782                         continue;
783                 if (rdev_add_key(rdev, dev, i, false, NULL,
784                                  &wdev->connect_keys->params[i])) {
785                         netdev_err(dev, "failed to set key %d\n", i);
786                         continue;
787                 }
788                 if (wdev->connect_keys->def == i)
789                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
790                                 netdev_err(dev, "failed to set defkey %d\n", i);
791                                 continue;
792                         }
793                 if (wdev->connect_keys->defmgmt == i)
794                         if (rdev_set_default_mgmt_key(rdev, dev, i))
795                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
796         }
797 
798         kfree(wdev->connect_keys);
799         wdev->connect_keys = NULL;
800 }
801 
802 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
803 {
804         struct cfg80211_event *ev;
805         unsigned long flags;
806         const u8 *bssid = NULL;
807 
808         spin_lock_irqsave(&wdev->event_lock, flags);
809         while (!list_empty(&wdev->event_list)) {
810                 ev = list_first_entry(&wdev->event_list,
811                                       struct cfg80211_event, list);
812                 list_del(&ev->list);
813                 spin_unlock_irqrestore(&wdev->event_lock, flags);
814 
815                 wdev_lock(wdev);
816                 switch (ev->type) {
817                 case EVENT_CONNECT_RESULT:
818                         if (!is_zero_ether_addr(ev->cr.bssid))
819                                 bssid = ev->cr.bssid;
820                         __cfg80211_connect_result(
821                                 wdev->netdev, bssid,
822                                 ev->cr.req_ie, ev->cr.req_ie_len,
823                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
824                                 ev->cr.status,
825                                 ev->cr.status == WLAN_STATUS_SUCCESS,
826                                 NULL);
827                         break;
828                 case EVENT_ROAMED:
829                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
830                                           ev->rm.req_ie_len, ev->rm.resp_ie,
831                                           ev->rm.resp_ie_len);
832                         break;
833                 case EVENT_DISCONNECTED:
834                         __cfg80211_disconnected(wdev->netdev,
835                                                 ev->dc.ie, ev->dc.ie_len,
836                                                 ev->dc.reason, true);
837                         break;
838                 case EVENT_IBSS_JOINED:
839                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
840                                                ev->ij.channel);
841                         break;
842                 }
843                 wdev_unlock(wdev);
844 
845                 kfree(ev);
846 
847                 spin_lock_irqsave(&wdev->event_lock, flags);
848         }
849         spin_unlock_irqrestore(&wdev->event_lock, flags);
850 }
851 
852 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
853 {
854         struct wireless_dev *wdev;
855 
856         ASSERT_RTNL();
857 
858         list_for_each_entry(wdev, &rdev->wdev_list, list)
859                 cfg80211_process_wdev_events(wdev);
860 }
861 
862 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
863                           struct net_device *dev, enum nl80211_iftype ntype,
864                           u32 *flags, struct vif_params *params)
865 {
866         int err;
867         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
868 
869         ASSERT_RTNL();
870 
871         /* don't support changing VLANs, you just re-create them */
872         if (otype == NL80211_IFTYPE_AP_VLAN)
873                 return -EOPNOTSUPP;
874 
875         /* cannot change into P2P device type */
876         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
877                 return -EOPNOTSUPP;
878 
879         if (!rdev->ops->change_virtual_intf ||
880             !(rdev->wiphy.interface_modes & (1 << ntype)))
881                 return -EOPNOTSUPP;
882 
883         /* if it's part of a bridge, reject changing type to station/ibss */
884         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
885             (ntype == NL80211_IFTYPE_ADHOC ||
886              ntype == NL80211_IFTYPE_STATION ||
887              ntype == NL80211_IFTYPE_P2P_CLIENT))
888                 return -EBUSY;
889 
890         if (ntype != otype && netif_running(dev)) {
891                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
892                                                     ntype);
893                 if (err)
894                         return err;
895 
896                 dev->ieee80211_ptr->use_4addr = false;
897                 dev->ieee80211_ptr->mesh_id_up_len = 0;
898                 wdev_lock(dev->ieee80211_ptr);
899                 rdev_set_qos_map(rdev, dev, NULL);
900                 wdev_unlock(dev->ieee80211_ptr);
901 
902                 switch (otype) {
903                 case NL80211_IFTYPE_AP:
904                         cfg80211_stop_ap(rdev, dev, true);
905                         break;
906                 case NL80211_IFTYPE_ADHOC:
907                         cfg80211_leave_ibss(rdev, dev, false);
908                         break;
909                 case NL80211_IFTYPE_STATION:
910                 case NL80211_IFTYPE_P2P_CLIENT:
911                         wdev_lock(dev->ieee80211_ptr);
912                         cfg80211_disconnect(rdev, dev,
913                                             WLAN_REASON_DEAUTH_LEAVING, true);
914                         wdev_unlock(dev->ieee80211_ptr);
915                         break;
916                 case NL80211_IFTYPE_MESH_POINT:
917                         /* mesh should be handled? */
918                         break;
919                 default:
920                         break;
921                 }
922 
923                 cfg80211_process_rdev_events(rdev);
924         }
925 
926         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
927 
928         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
929 
930         if (!err && params && params->use_4addr != -1)
931                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
932 
933         if (!err) {
934                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
935                 switch (ntype) {
936                 case NL80211_IFTYPE_STATION:
937                         if (dev->ieee80211_ptr->use_4addr)
938                                 break;
939                         /* fall through */
940                 case NL80211_IFTYPE_P2P_CLIENT:
941                 case NL80211_IFTYPE_ADHOC:
942                         dev->priv_flags |= IFF_DONT_BRIDGE;
943                         break;
944                 case NL80211_IFTYPE_P2P_GO:
945                 case NL80211_IFTYPE_AP:
946                 case NL80211_IFTYPE_AP_VLAN:
947                 case NL80211_IFTYPE_WDS:
948                 case NL80211_IFTYPE_MESH_POINT:
949                         /* bridging OK */
950                         break;
951                 case NL80211_IFTYPE_MONITOR:
952                         /* monitor can't bridge anyway */
953                         break;
954                 case NL80211_IFTYPE_UNSPECIFIED:
955                 case NUM_NL80211_IFTYPES:
956                         /* not happening */
957                         break;
958                 case NL80211_IFTYPE_P2P_DEVICE:
959                         WARN_ON(1);
960                         break;
961                 }
962         }
963 
964         if (!err && ntype != otype && netif_running(dev)) {
965                 cfg80211_update_iface_num(rdev, ntype, 1);
966                 cfg80211_update_iface_num(rdev, otype, -1);
967         }
968 
969         return err;
970 }
971 
972 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
973 {
974         static const u32 __mcs2bitrate[] = {
975                 /* control PHY */
976                 [0] =   275,
977                 /* SC PHY */
978                 [1] =  3850,
979                 [2] =  7700,
980                 [3] =  9625,
981                 [4] = 11550,
982                 [5] = 12512, /* 1251.25 mbps */
983                 [6] = 15400,
984                 [7] = 19250,
985                 [8] = 23100,
986                 [9] = 25025,
987                 [10] = 30800,
988                 [11] = 38500,
989                 [12] = 46200,
990                 /* OFDM PHY */
991                 [13] =  6930,
992                 [14] =  8662, /* 866.25 mbps */
993                 [15] = 13860,
994                 [16] = 17325,
995                 [17] = 20790,
996                 [18] = 27720,
997                 [19] = 34650,
998                 [20] = 41580,
999                 [21] = 45045,
1000                 [22] = 51975,
1001                 [23] = 62370,
1002                 [24] = 67568, /* 6756.75 mbps */
1003                 /* LP-SC PHY */
1004                 [25] =  6260,
1005                 [26] =  8340,
1006                 [27] = 11120,
1007                 [28] = 12510,
1008                 [29] = 16680,
1009                 [30] = 22240,
1010                 [31] = 25030,
1011         };
1012 
1013         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1014                 return 0;
1015 
1016         return __mcs2bitrate[rate->mcs];
1017 }
1018 
1019 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1020 {
1021         static const u32 base[4][10] = {
1022                 {   6500000,
1023                    13000000,
1024                    19500000,
1025                    26000000,
1026                    39000000,
1027                    52000000,
1028                    58500000,
1029                    65000000,
1030                    78000000,
1031                    0,
1032                 },
1033                 {  13500000,
1034                    27000000,
1035                    40500000,
1036                    54000000,
1037                    81000000,
1038                   108000000,
1039                   121500000,
1040                   135000000,
1041                   162000000,
1042                   180000000,
1043                 },
1044                 {  29300000,
1045                    58500000,
1046                    87800000,
1047                   117000000,
1048                   175500000,
1049                   234000000,
1050                   263300000,
1051                   292500000,
1052                   351000000,
1053                   390000000,
1054                 },
1055                 {  58500000,
1056                   117000000,
1057                   175500000,
1058                   234000000,
1059                   351000000,
1060                   468000000,
1061                   526500000,
1062                   585000000,
1063                   702000000,
1064                   780000000,
1065                 },
1066         };
1067         u32 bitrate;
1068         int idx;
1069 
1070         if (WARN_ON_ONCE(rate->mcs > 9))
1071                 return 0;
1072 
1073         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1074                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1075                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1076                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1077 
1078         bitrate = base[idx][rate->mcs];
1079         bitrate *= rate->nss;
1080 
1081         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1082                 bitrate = (bitrate / 9) * 10;
1083 
1084         /* do NOT round down here */
1085         return (bitrate + 50000) / 100000;
1086 }
1087 
1088 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1089 {
1090         int modulation, streams, bitrate;
1091 
1092         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1093             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1094                 return rate->legacy;
1095         if (rate->flags & RATE_INFO_FLAGS_60G)
1096                 return cfg80211_calculate_bitrate_60g(rate);
1097         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1098                 return cfg80211_calculate_bitrate_vht(rate);
1099 
1100         /* the formula below does only work for MCS values smaller than 32 */
1101         if (WARN_ON_ONCE(rate->mcs >= 32))
1102                 return 0;
1103 
1104         modulation = rate->mcs & 7;
1105         streams = (rate->mcs >> 3) + 1;
1106 
1107         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1108                         13500000 : 6500000;
1109 
1110         if (modulation < 4)
1111                 bitrate *= (modulation + 1);
1112         else if (modulation == 4)
1113                 bitrate *= (modulation + 2);
1114         else
1115                 bitrate *= (modulation + 3);
1116 
1117         bitrate *= streams;
1118 
1119         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1120                 bitrate = (bitrate / 9) * 10;
1121 
1122         /* do NOT round down here */
1123         return (bitrate + 50000) / 100000;
1124 }
1125 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1126 
1127 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1128                           enum ieee80211_p2p_attr_id attr,
1129                           u8 *buf, unsigned int bufsize)
1130 {
1131         u8 *out = buf;
1132         u16 attr_remaining = 0;
1133         bool desired_attr = false;
1134         u16 desired_len = 0;
1135 
1136         while (len > 0) {
1137                 unsigned int iedatalen;
1138                 unsigned int copy;
1139                 const u8 *iedata;
1140 
1141                 if (len < 2)
1142                         return -EILSEQ;
1143                 iedatalen = ies[1];
1144                 if (iedatalen + 2 > len)
1145                         return -EILSEQ;
1146 
1147                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1148                         goto cont;
1149 
1150                 if (iedatalen < 4)
1151                         goto cont;
1152 
1153                 iedata = ies + 2;
1154 
1155                 /* check WFA OUI, P2P subtype */
1156                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1157                     iedata[2] != 0x9a || iedata[3] != 0x09)
1158                         goto cont;
1159 
1160                 iedatalen -= 4;
1161                 iedata += 4;
1162 
1163                 /* check attribute continuation into this IE */
1164                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1165                 if (copy && desired_attr) {
1166                         desired_len += copy;
1167                         if (out) {
1168                                 memcpy(out, iedata, min(bufsize, copy));
1169                                 out += min(bufsize, copy);
1170                                 bufsize -= min(bufsize, copy);
1171                         }
1172 
1173 
1174                         if (copy == attr_remaining)
1175                                 return desired_len;
1176                 }
1177 
1178                 attr_remaining -= copy;
1179                 if (attr_remaining)
1180                         goto cont;
1181 
1182                 iedatalen -= copy;
1183                 iedata += copy;
1184 
1185                 while (iedatalen > 0) {
1186                         u16 attr_len;
1187 
1188                         /* P2P attribute ID & size must fit */
1189                         if (iedatalen < 3)
1190                                 return -EILSEQ;
1191                         desired_attr = iedata[0] == attr;
1192                         attr_len = get_unaligned_le16(iedata + 1);
1193                         iedatalen -= 3;
1194                         iedata += 3;
1195 
1196                         copy = min_t(unsigned int, attr_len, iedatalen);
1197 
1198                         if (desired_attr) {
1199                                 desired_len += copy;
1200                                 if (out) {
1201                                         memcpy(out, iedata, min(bufsize, copy));
1202                                         out += min(bufsize, copy);
1203                                         bufsize -= min(bufsize, copy);
1204                                 }
1205 
1206                                 if (copy == attr_len)
1207                                         return desired_len;
1208                         }
1209 
1210                         iedata += copy;
1211                         iedatalen -= copy;
1212                         attr_remaining = attr_len - copy;
1213                 }
1214 
1215  cont:
1216                 len -= ies[1] + 2;
1217                 ies += ies[1] + 2;
1218         }
1219 
1220         if (attr_remaining && desired_attr)
1221                 return -EILSEQ;
1222 
1223         return -ENOENT;
1224 }
1225 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1226 
1227 bool ieee80211_operating_class_to_band(u8 operating_class,
1228                                        enum ieee80211_band *band)
1229 {
1230         switch (operating_class) {
1231         case 112:
1232         case 115 ... 127:
1233                 *band = IEEE80211_BAND_5GHZ;
1234                 return true;
1235         case 81:
1236         case 82:
1237         case 83:
1238         case 84:
1239                 *band = IEEE80211_BAND_2GHZ;
1240                 return true;
1241         case 180:
1242                 *band = IEEE80211_BAND_60GHZ;
1243                 return true;
1244         }
1245 
1246         return false;
1247 }
1248 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1249 
1250 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1251                                  u32 beacon_int)
1252 {
1253         struct wireless_dev *wdev;
1254         int res = 0;
1255 
1256         if (!beacon_int)
1257                 return -EINVAL;
1258 
1259         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1260                 if (!wdev->beacon_interval)
1261                         continue;
1262                 if (wdev->beacon_interval != beacon_int) {
1263                         res = -EINVAL;
1264                         break;
1265                 }
1266         }
1267 
1268         return res;
1269 }
1270 
1271 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1272                                  struct wireless_dev *wdev,
1273                                  enum nl80211_iftype iftype,
1274                                  struct ieee80211_channel *chan,
1275                                  enum cfg80211_chan_mode chanmode,
1276                                  u8 radar_detect)
1277 {
1278         struct wireless_dev *wdev_iter;
1279         u32 used_iftypes = BIT(iftype);
1280         int num[NUM_NL80211_IFTYPES];
1281         struct ieee80211_channel
1282                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1283         struct ieee80211_channel *ch;
1284         enum cfg80211_chan_mode chmode;
1285         int num_different_channels = 0;
1286         int total = 1;
1287         int i, j;
1288 
1289         ASSERT_RTNL();
1290 
1291         if (WARN_ON(hweight32(radar_detect) > 1))
1292                 return -EINVAL;
1293 
1294         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
1295                 return -EINVAL;
1296 
1297         /* Always allow software iftypes */
1298         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1299                 if (radar_detect)
1300                         return -EINVAL;
1301                 return 0;
1302         }
1303 
1304         memset(num, 0, sizeof(num));
1305         memset(used_channels, 0, sizeof(used_channels));
1306 
1307         num[iftype] = 1;
1308 
1309         switch (chanmode) {
1310         case CHAN_MODE_UNDEFINED:
1311                 break;
1312         case CHAN_MODE_SHARED:
1313                 WARN_ON(!chan);
1314                 used_channels[0] = chan;
1315                 num_different_channels++;
1316                 break;
1317         case CHAN_MODE_EXCLUSIVE:
1318                 num_different_channels++;
1319                 break;
1320         }
1321 
1322         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1323                 if (wdev_iter == wdev)
1324                         continue;
1325                 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1326                         if (!wdev_iter->p2p_started)
1327                                 continue;
1328                 } else if (wdev_iter->netdev) {
1329                         if (!netif_running(wdev_iter->netdev))
1330                                 continue;
1331                 } else {
1332                         WARN_ON(1);
1333                 }
1334 
1335                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1336                         continue;
1337 
1338                 /*
1339                  * We may be holding the "wdev" mutex, but now need to lock
1340                  * wdev_iter. This is OK because once we get here wdev_iter
1341                  * is not wdev (tested above), but we need to use the nested
1342                  * locking for lockdep.
1343                  */
1344                 mutex_lock_nested(&wdev_iter->mtx, 1);
1345                 __acquire(wdev_iter->mtx);
1346                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
1347                 wdev_unlock(wdev_iter);
1348 
1349                 switch (chmode) {
1350                 case CHAN_MODE_UNDEFINED:
1351                         break;
1352                 case CHAN_MODE_SHARED:
1353                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1354                                 if (!used_channels[i] || used_channels[i] == ch)
1355                                         break;
1356 
1357                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1358                                 return -EBUSY;
1359 
1360                         if (used_channels[i] == NULL) {
1361                                 used_channels[i] = ch;
1362                                 num_different_channels++;
1363                         }
1364                         break;
1365                 case CHAN_MODE_EXCLUSIVE:
1366                         num_different_channels++;
1367                         break;
1368                 }
1369 
1370                 num[wdev_iter->iftype]++;
1371                 total++;
1372                 used_iftypes |= BIT(wdev_iter->iftype);
1373         }
1374 
1375         if (total == 1 && !radar_detect)
1376                 return 0;
1377 
1378         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1379                 const struct ieee80211_iface_combination *c;
1380                 struct ieee80211_iface_limit *limits;
1381                 u32 all_iftypes = 0;
1382 
1383                 c = &rdev->wiphy.iface_combinations[i];
1384 
1385                 if (total > c->max_interfaces)
1386                         continue;
1387                 if (num_different_channels > c->num_different_channels)
1388                         continue;
1389 
1390                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1391                                  GFP_KERNEL);
1392                 if (!limits)
1393                         return -ENOMEM;
1394 
1395                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1396                         if (rdev->wiphy.software_iftypes & BIT(iftype))
1397                                 continue;
1398                         for (j = 0; j < c->n_limits; j++) {
1399                                 all_iftypes |= limits[j].types;
1400                                 if (!(limits[j].types & BIT(iftype)))
1401                                         continue;
1402                                 if (limits[j].max < num[iftype])
1403                                         goto cont;
1404                                 limits[j].max -= num[iftype];
1405                         }
1406                 }
1407 
1408                 if (radar_detect && !(c->radar_detect_widths & radar_detect))
1409                         goto cont;
1410 
1411                 /*
1412                  * Finally check that all iftypes that we're currently
1413                  * using are actually part of this combination. If they
1414                  * aren't then we can't use this combination and have
1415                  * to continue to the next.
1416                  */
1417                 if ((all_iftypes & used_iftypes) != used_iftypes)
1418                         goto cont;
1419 
1420                 /*
1421                  * This combination covered all interface types and
1422                  * supported the requested numbers, so we're good.
1423                  */
1424                 kfree(limits);
1425                 return 0;
1426  cont:
1427                 kfree(limits);
1428         }
1429 
1430         return -EBUSY;
1431 }
1432 
1433 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1434                            const u8 *rates, unsigned int n_rates,
1435                            u32 *mask)
1436 {
1437         int i, j;
1438 
1439         if (!sband)
1440                 return -EINVAL;
1441 
1442         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1443                 return -EINVAL;
1444 
1445         *mask = 0;
1446 
1447         for (i = 0; i < n_rates; i++) {
1448                 int rate = (rates[i] & 0x7f) * 5;
1449                 bool found = false;
1450 
1451                 for (j = 0; j < sband->n_bitrates; j++) {
1452                         if (sband->bitrates[j].bitrate == rate) {
1453                                 found = true;
1454                                 *mask |= BIT(j);
1455                                 break;
1456                         }
1457                 }
1458                 if (!found)
1459                         return -EINVAL;
1460         }
1461 
1462         /*
1463          * mask must have at least one bit set here since we
1464          * didn't accept a 0-length rates array nor allowed
1465          * entries in the array that didn't exist
1466          */
1467 
1468         return 0;
1469 }
1470 
1471 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1472 {
1473         enum ieee80211_band band;
1474         unsigned int n_channels = 0;
1475 
1476         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1477                 if (wiphy->bands[band])
1478                         n_channels += wiphy->bands[band]->n_channels;
1479 
1480         return n_channels;
1481 }
1482 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1483 
1484 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1485 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1486 const unsigned char rfc1042_header[] __aligned(2) =
1487         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1488 EXPORT_SYMBOL(rfc1042_header);
1489 
1490 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1491 const unsigned char bridge_tunnel_header[] __aligned(2) =
1492         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1493 EXPORT_SYMBOL(bridge_tunnel_header);
1494 

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