net: add ETH_P_802_3_MIN
[linux-3.10.git] / net / wireless / util.c
1 /*
2  * Wireless utility functions
3  *
4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
5  */
6 #include <linux/export.h>
7 #include <linux/bitops.h>
8 #include <linux/etherdevice.h>
9 #include <linux/slab.h>
10 #include <net/cfg80211.h>
11 #include <net/ip.h>
12 #include <net/dsfield.h>
13 #include "core.h"
14 #include "rdev-ops.h"
15
16
17 struct ieee80211_rate *
18 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
19                             u32 basic_rates, int bitrate)
20 {
21         struct ieee80211_rate *result = &sband->bitrates[0];
22         int i;
23
24         for (i = 0; i < sband->n_bitrates; i++) {
25                 if (!(basic_rates & BIT(i)))
26                         continue;
27                 if (sband->bitrates[i].bitrate > bitrate)
28                         continue;
29                 result = &sband->bitrates[i];
30         }
31
32         return result;
33 }
34 EXPORT_SYMBOL(ieee80211_get_response_rate);
35
36 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
37 {
38         /* see 802.11 17.3.8.3.2 and Annex J
39          * there are overlapping channel numbers in 5GHz and 2GHz bands */
40         if (chan <= 0)
41                 return 0; /* not supported */
42         switch (band) {
43         case IEEE80211_BAND_2GHZ:
44                 if (chan == 14)
45                         return 2484;
46                 else if (chan < 14)
47                         return 2407 + chan * 5;
48                 break;
49         case IEEE80211_BAND_5GHZ:
50                 if (chan >= 182 && chan <= 196)
51                         return 4000 + chan * 5;
52                 else
53                         return 5000 + chan * 5;
54                 break;
55         case IEEE80211_BAND_60GHZ:
56                 if (chan < 5)
57                         return 56160 + chan * 2160;
58                 break;
59         default:
60                 ;
61         }
62         return 0; /* not supported */
63 }
64 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
65
66 int ieee80211_frequency_to_channel(int freq)
67 {
68         /* see 802.11 17.3.8.3.2 and Annex J */
69         if (freq == 2484)
70                 return 14;
71         else if (freq < 2484)
72                 return (freq - 2407) / 5;
73         else if (freq >= 4910 && freq <= 4980)
74                 return (freq - 4000) / 5;
75         else if (freq <= 45000) /* DMG band lower limit */
76                 return (freq - 5000) / 5;
77         else if (freq >= 58320 && freq <= 64800)
78                 return (freq - 56160) / 2160;
79         else
80                 return 0;
81 }
82 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
83
84 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
85                                                   int freq)
86 {
87         enum ieee80211_band band;
88         struct ieee80211_supported_band *sband;
89         int i;
90
91         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
92                 sband = wiphy->bands[band];
93
94                 if (!sband)
95                         continue;
96
97                 for (i = 0; i < sband->n_channels; i++) {
98                         if (sband->channels[i].center_freq == freq)
99                                 return &sband->channels[i];
100                 }
101         }
102
103         return NULL;
104 }
105 EXPORT_SYMBOL(__ieee80211_get_channel);
106
107 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
108                                      enum ieee80211_band band)
109 {
110         int i, want;
111
112         switch (band) {
113         case IEEE80211_BAND_5GHZ:
114                 want = 3;
115                 for (i = 0; i < sband->n_bitrates; i++) {
116                         if (sband->bitrates[i].bitrate == 60 ||
117                             sband->bitrates[i].bitrate == 120 ||
118                             sband->bitrates[i].bitrate == 240) {
119                                 sband->bitrates[i].flags |=
120                                         IEEE80211_RATE_MANDATORY_A;
121                                 want--;
122                         }
123                 }
124                 WARN_ON(want);
125                 break;
126         case IEEE80211_BAND_2GHZ:
127                 want = 7;
128                 for (i = 0; i < sband->n_bitrates; i++) {
129                         if (sband->bitrates[i].bitrate == 10) {
130                                 sband->bitrates[i].flags |=
131                                         IEEE80211_RATE_MANDATORY_B |
132                                         IEEE80211_RATE_MANDATORY_G;
133                                 want--;
134                         }
135
136                         if (sband->bitrates[i].bitrate == 20 ||
137                             sband->bitrates[i].bitrate == 55 ||
138                             sband->bitrates[i].bitrate == 110 ||
139                             sband->bitrates[i].bitrate == 60 ||
140                             sband->bitrates[i].bitrate == 120 ||
141                             sband->bitrates[i].bitrate == 240) {
142                                 sband->bitrates[i].flags |=
143                                         IEEE80211_RATE_MANDATORY_G;
144                                 want--;
145                         }
146
147                         if (sband->bitrates[i].bitrate != 10 &&
148                             sband->bitrates[i].bitrate != 20 &&
149                             sband->bitrates[i].bitrate != 55 &&
150                             sband->bitrates[i].bitrate != 110)
151                                 sband->bitrates[i].flags |=
152                                         IEEE80211_RATE_ERP_G;
153                 }
154                 WARN_ON(want != 0 && want != 3 && want != 6);
155                 break;
156         case IEEE80211_BAND_60GHZ:
157                 /* check for mandatory HT MCS 1..4 */
158                 WARN_ON(!sband->ht_cap.ht_supported);
159                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
160                 break;
161         case IEEE80211_NUM_BANDS:
162                 WARN_ON(1);
163                 break;
164         }
165 }
166
167 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
168 {
169         enum ieee80211_band band;
170
171         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
172                 if (wiphy->bands[band])
173                         set_mandatory_flags_band(wiphy->bands[band], band);
174 }
175
176 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
177 {
178         int i;
179         for (i = 0; i < wiphy->n_cipher_suites; i++)
180                 if (cipher == wiphy->cipher_suites[i])
181                         return true;
182         return false;
183 }
184
185 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
186                                    struct key_params *params, int key_idx,
187                                    bool pairwise, const u8 *mac_addr)
188 {
189         if (key_idx > 5)
190                 return -EINVAL;
191
192         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
193                 return -EINVAL;
194
195         if (pairwise && !mac_addr)
196                 return -EINVAL;
197
198         /*
199          * Disallow pairwise keys with non-zero index unless it's WEP
200          * or a vendor specific cipher (because current deployments use
201          * pairwise WEP keys with non-zero indices and for vendor specific
202          * ciphers this should be validated in the driver or hardware level
203          * - but 802.11i clearly specifies to use zero)
204          */
205         if (pairwise && key_idx &&
206             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
207              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
208              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
209                 return -EINVAL;
210
211         switch (params->cipher) {
212         case WLAN_CIPHER_SUITE_WEP40:
213                 if (params->key_len != WLAN_KEY_LEN_WEP40)
214                         return -EINVAL;
215                 break;
216         case WLAN_CIPHER_SUITE_TKIP:
217                 if (params->key_len != WLAN_KEY_LEN_TKIP)
218                         return -EINVAL;
219                 break;
220         case WLAN_CIPHER_SUITE_CCMP:
221                 if (params->key_len != WLAN_KEY_LEN_CCMP)
222                         return -EINVAL;
223                 break;
224         case WLAN_CIPHER_SUITE_WEP104:
225                 if (params->key_len != WLAN_KEY_LEN_WEP104)
226                         return -EINVAL;
227                 break;
228         case WLAN_CIPHER_SUITE_AES_CMAC:
229                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
230                         return -EINVAL;
231                 break;
232         default:
233                 /*
234                  * We don't know anything about this algorithm,
235                  * allow using it -- but the driver must check
236                  * all parameters! We still check below whether
237                  * or not the driver supports this algorithm,
238                  * of course.
239                  */
240                 break;
241         }
242
243         if (params->seq) {
244                 switch (params->cipher) {
245                 case WLAN_CIPHER_SUITE_WEP40:
246                 case WLAN_CIPHER_SUITE_WEP104:
247                         /* These ciphers do not use key sequence */
248                         return -EINVAL;
249                 case WLAN_CIPHER_SUITE_TKIP:
250                 case WLAN_CIPHER_SUITE_CCMP:
251                 case WLAN_CIPHER_SUITE_AES_CMAC:
252                         if (params->seq_len != 6)
253                                 return -EINVAL;
254                         break;
255                 }
256         }
257
258         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
259                 return -EINVAL;
260
261         return 0;
262 }
263
264 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
265 {
266         unsigned int hdrlen = 24;
267
268         if (ieee80211_is_data(fc)) {
269                 if (ieee80211_has_a4(fc))
270                         hdrlen = 30;
271                 if (ieee80211_is_data_qos(fc)) {
272                         hdrlen += IEEE80211_QOS_CTL_LEN;
273                         if (ieee80211_has_order(fc))
274                                 hdrlen += IEEE80211_HT_CTL_LEN;
275                 }
276                 goto out;
277         }
278
279         if (ieee80211_is_ctl(fc)) {
280                 /*
281                  * ACK and CTS are 10 bytes, all others 16. To see how
282                  * to get this condition consider
283                  *   subtype mask:   0b0000000011110000 (0x00F0)
284                  *   ACK subtype:    0b0000000011010000 (0x00D0)
285                  *   CTS subtype:    0b0000000011000000 (0x00C0)
286                  *   bits that matter:         ^^^      (0x00E0)
287                  *   value of those: 0b0000000011000000 (0x00C0)
288                  */
289                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
290                         hdrlen = 10;
291                 else
292                         hdrlen = 16;
293         }
294 out:
295         return hdrlen;
296 }
297 EXPORT_SYMBOL(ieee80211_hdrlen);
298
299 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
300 {
301         const struct ieee80211_hdr *hdr =
302                         (const struct ieee80211_hdr *)skb->data;
303         unsigned int hdrlen;
304
305         if (unlikely(skb->len < 10))
306                 return 0;
307         hdrlen = ieee80211_hdrlen(hdr->frame_control);
308         if (unlikely(hdrlen > skb->len))
309                 return 0;
310         return hdrlen;
311 }
312 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
313
314 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
315 {
316         int ae = meshhdr->flags & MESH_FLAGS_AE;
317         /* 802.11-2012, 8.2.4.7.3 */
318         switch (ae) {
319         default:
320         case 0:
321                 return 6;
322         case MESH_FLAGS_AE_A4:
323                 return 12;
324         case MESH_FLAGS_AE_A5_A6:
325                 return 18;
326         }
327 }
328 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
329
330 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
331                            enum nl80211_iftype iftype)
332 {
333         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
334         u16 hdrlen, ethertype;
335         u8 *payload;
336         u8 dst[ETH_ALEN];
337         u8 src[ETH_ALEN] __aligned(2);
338
339         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
340                 return -1;
341
342         hdrlen = ieee80211_hdrlen(hdr->frame_control);
343
344         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
345          * header
346          * IEEE 802.11 address fields:
347          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
348          *   0     0   DA    SA    BSSID n/a
349          *   0     1   DA    BSSID SA    n/a
350          *   1     0   BSSID SA    DA    n/a
351          *   1     1   RA    TA    DA    SA
352          */
353         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
354         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
355
356         switch (hdr->frame_control &
357                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
358         case cpu_to_le16(IEEE80211_FCTL_TODS):
359                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
360                              iftype != NL80211_IFTYPE_AP_VLAN &&
361                              iftype != NL80211_IFTYPE_P2P_GO))
362                         return -1;
363                 break;
364         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
365                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
366                              iftype != NL80211_IFTYPE_MESH_POINT &&
367                              iftype != NL80211_IFTYPE_AP_VLAN &&
368                              iftype != NL80211_IFTYPE_STATION))
369                         return -1;
370                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
371                         struct ieee80211s_hdr *meshdr =
372                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
373                         /* make sure meshdr->flags is on the linear part */
374                         if (!pskb_may_pull(skb, hdrlen + 1))
375                                 return -1;
376                         if (meshdr->flags & MESH_FLAGS_AE_A4)
377                                 return -1;
378                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
379                                 skb_copy_bits(skb, hdrlen +
380                                         offsetof(struct ieee80211s_hdr, eaddr1),
381                                         dst, ETH_ALEN);
382                                 skb_copy_bits(skb, hdrlen +
383                                         offsetof(struct ieee80211s_hdr, eaddr2),
384                                         src, ETH_ALEN);
385                         }
386                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
387                 }
388                 break;
389         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
390                 if ((iftype != NL80211_IFTYPE_STATION &&
391                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
392                      iftype != NL80211_IFTYPE_MESH_POINT) ||
393                     (is_multicast_ether_addr(dst) &&
394                      ether_addr_equal(src, addr)))
395                         return -1;
396                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
397                         struct ieee80211s_hdr *meshdr =
398                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
399                         /* make sure meshdr->flags is on the linear part */
400                         if (!pskb_may_pull(skb, hdrlen + 1))
401                                 return -1;
402                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
403                                 return -1;
404                         if (meshdr->flags & MESH_FLAGS_AE_A4)
405                                 skb_copy_bits(skb, hdrlen +
406                                         offsetof(struct ieee80211s_hdr, eaddr1),
407                                         src, ETH_ALEN);
408                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
409                 }
410                 break;
411         case cpu_to_le16(0):
412                 if (iftype != NL80211_IFTYPE_ADHOC &&
413                     iftype != NL80211_IFTYPE_STATION)
414                                 return -1;
415                 break;
416         }
417
418         if (!pskb_may_pull(skb, hdrlen + 8))
419                 return -1;
420
421         payload = skb->data + hdrlen;
422         ethertype = (payload[6] << 8) | payload[7];
423
424         if (likely((ether_addr_equal(payload, rfc1042_header) &&
425                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
426                    ether_addr_equal(payload, bridge_tunnel_header))) {
427                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
428                  * replace EtherType */
429                 skb_pull(skb, hdrlen + 6);
430                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
431                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
432         } else {
433                 struct ethhdr *ehdr;
434                 __be16 len;
435
436                 skb_pull(skb, hdrlen);
437                 len = htons(skb->len);
438                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
439                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
440                 memcpy(ehdr->h_source, src, ETH_ALEN);
441                 ehdr->h_proto = len;
442         }
443         return 0;
444 }
445 EXPORT_SYMBOL(ieee80211_data_to_8023);
446
447 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
448                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
449 {
450         struct ieee80211_hdr hdr;
451         u16 hdrlen, ethertype;
452         __le16 fc;
453         const u8 *encaps_data;
454         int encaps_len, skip_header_bytes;
455         int nh_pos, h_pos;
456         int head_need;
457
458         if (unlikely(skb->len < ETH_HLEN))
459                 return -EINVAL;
460
461         nh_pos = skb_network_header(skb) - skb->data;
462         h_pos = skb_transport_header(skb) - skb->data;
463
464         /* convert Ethernet header to proper 802.11 header (based on
465          * operation mode) */
466         ethertype = (skb->data[12] << 8) | skb->data[13];
467         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
468
469         switch (iftype) {
470         case NL80211_IFTYPE_AP:
471         case NL80211_IFTYPE_AP_VLAN:
472         case NL80211_IFTYPE_P2P_GO:
473                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
474                 /* DA BSSID SA */
475                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
476                 memcpy(hdr.addr2, addr, ETH_ALEN);
477                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
478                 hdrlen = 24;
479                 break;
480         case NL80211_IFTYPE_STATION:
481         case NL80211_IFTYPE_P2P_CLIENT:
482                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
483                 /* BSSID SA DA */
484                 memcpy(hdr.addr1, bssid, ETH_ALEN);
485                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
486                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
487                 hdrlen = 24;
488                 break;
489         case NL80211_IFTYPE_ADHOC:
490                 /* DA SA BSSID */
491                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
492                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
493                 memcpy(hdr.addr3, bssid, ETH_ALEN);
494                 hdrlen = 24;
495                 break;
496         default:
497                 return -EOPNOTSUPP;
498         }
499
500         if (qos) {
501                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
502                 hdrlen += 2;
503         }
504
505         hdr.frame_control = fc;
506         hdr.duration_id = 0;
507         hdr.seq_ctrl = 0;
508
509         skip_header_bytes = ETH_HLEN;
510         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
511                 encaps_data = bridge_tunnel_header;
512                 encaps_len = sizeof(bridge_tunnel_header);
513                 skip_header_bytes -= 2;
514         } else if (ethertype >= ETH_P_802_3_MIN) {
515                 encaps_data = rfc1042_header;
516                 encaps_len = sizeof(rfc1042_header);
517                 skip_header_bytes -= 2;
518         } else {
519                 encaps_data = NULL;
520                 encaps_len = 0;
521         }
522
523         skb_pull(skb, skip_header_bytes);
524         nh_pos -= skip_header_bytes;
525         h_pos -= skip_header_bytes;
526
527         head_need = hdrlen + encaps_len - skb_headroom(skb);
528
529         if (head_need > 0 || skb_cloned(skb)) {
530                 head_need = max(head_need, 0);
531                 if (head_need)
532                         skb_orphan(skb);
533
534                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
535                         return -ENOMEM;
536
537                 skb->truesize += head_need;
538         }
539
540         if (encaps_data) {
541                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
542                 nh_pos += encaps_len;
543                 h_pos += encaps_len;
544         }
545
546         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
547
548         nh_pos += hdrlen;
549         h_pos += hdrlen;
550
551         /* Update skb pointers to various headers since this modified frame
552          * is going to go through Linux networking code that may potentially
553          * need things like pointer to IP header. */
554         skb_set_mac_header(skb, 0);
555         skb_set_network_header(skb, nh_pos);
556         skb_set_transport_header(skb, h_pos);
557
558         return 0;
559 }
560 EXPORT_SYMBOL(ieee80211_data_from_8023);
561
562
563 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
564                               const u8 *addr, enum nl80211_iftype iftype,
565                               const unsigned int extra_headroom,
566                               bool has_80211_header)
567 {
568         struct sk_buff *frame = NULL;
569         u16 ethertype;
570         u8 *payload;
571         const struct ethhdr *eth;
572         int remaining, err;
573         u8 dst[ETH_ALEN], src[ETH_ALEN];
574
575         if (has_80211_header) {
576                 err = ieee80211_data_to_8023(skb, addr, iftype);
577                 if (err)
578                         goto out;
579
580                 /* skip the wrapping header */
581                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
582                 if (!eth)
583                         goto out;
584         } else {
585                 eth = (struct ethhdr *) skb->data;
586         }
587
588         while (skb != frame) {
589                 u8 padding;
590                 __be16 len = eth->h_proto;
591                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
592
593                 remaining = skb->len;
594                 memcpy(dst, eth->h_dest, ETH_ALEN);
595                 memcpy(src, eth->h_source, ETH_ALEN);
596
597                 padding = (4 - subframe_len) & 0x3;
598                 /* the last MSDU has no padding */
599                 if (subframe_len > remaining)
600                         goto purge;
601
602                 skb_pull(skb, sizeof(struct ethhdr));
603                 /* reuse skb for the last subframe */
604                 if (remaining <= subframe_len + padding)
605                         frame = skb;
606                 else {
607                         unsigned int hlen = ALIGN(extra_headroom, 4);
608                         /*
609                          * Allocate and reserve two bytes more for payload
610                          * alignment since sizeof(struct ethhdr) is 14.
611                          */
612                         frame = dev_alloc_skb(hlen + subframe_len + 2);
613                         if (!frame)
614                                 goto purge;
615
616                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
617                         memcpy(skb_put(frame, ntohs(len)), skb->data,
618                                 ntohs(len));
619
620                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
621                                                         padding);
622                         if (!eth) {
623                                 dev_kfree_skb(frame);
624                                 goto purge;
625                         }
626                 }
627
628                 skb_reset_network_header(frame);
629                 frame->dev = skb->dev;
630                 frame->priority = skb->priority;
631
632                 payload = frame->data;
633                 ethertype = (payload[6] << 8) | payload[7];
634
635                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
636                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
637                            ether_addr_equal(payload, bridge_tunnel_header))) {
638                         /* remove RFC1042 or Bridge-Tunnel
639                          * encapsulation and replace EtherType */
640                         skb_pull(frame, 6);
641                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
642                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
643                 } else {
644                         memcpy(skb_push(frame, sizeof(__be16)), &len,
645                                 sizeof(__be16));
646                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
647                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
648                 }
649                 __skb_queue_tail(list, frame);
650         }
651
652         return;
653
654  purge:
655         __skb_queue_purge(list);
656  out:
657         dev_kfree_skb(skb);
658 }
659 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
660
661 /* Given a data frame determine the 802.1p/1d tag to use. */
662 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
663 {
664         unsigned int dscp;
665
666         /* skb->priority values from 256->263 are magic values to
667          * directly indicate a specific 802.1d priority.  This is used
668          * to allow 802.1d priority to be passed directly in from VLAN
669          * tags, etc.
670          */
671         if (skb->priority >= 256 && skb->priority <= 263)
672                 return skb->priority - 256;
673
674         switch (skb->protocol) {
675         case htons(ETH_P_IP):
676                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
677                 break;
678         case htons(ETH_P_IPV6):
679                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
680                 break;
681         default:
682                 return 0;
683         }
684
685         return dscp >> 5;
686 }
687 EXPORT_SYMBOL(cfg80211_classify8021d);
688
689 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
690 {
691         const struct cfg80211_bss_ies *ies;
692
693         ies = rcu_dereference(bss->ies);
694         if (!ies)
695                 return NULL;
696
697         return cfg80211_find_ie(ie, ies->data, ies->len);
698 }
699 EXPORT_SYMBOL(ieee80211_bss_get_ie);
700
701 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
702 {
703         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
704         struct net_device *dev = wdev->netdev;
705         int i;
706
707         if (!wdev->connect_keys)
708                 return;
709
710         for (i = 0; i < 6; i++) {
711                 if (!wdev->connect_keys->params[i].cipher)
712                         continue;
713                 if (rdev_add_key(rdev, dev, i, false, NULL,
714                                  &wdev->connect_keys->params[i])) {
715                         netdev_err(dev, "failed to set key %d\n", i);
716                         continue;
717                 }
718                 if (wdev->connect_keys->def == i)
719                         if (rdev_set_default_key(rdev, dev, i, true, true)) {
720                                 netdev_err(dev, "failed to set defkey %d\n", i);
721                                 continue;
722                         }
723                 if (wdev->connect_keys->defmgmt == i)
724                         if (rdev_set_default_mgmt_key(rdev, dev, i))
725                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
726         }
727
728         kfree(wdev->connect_keys);
729         wdev->connect_keys = NULL;
730 }
731
732 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
733 {
734         struct cfg80211_event *ev;
735         unsigned long flags;
736         const u8 *bssid = NULL;
737
738         spin_lock_irqsave(&wdev->event_lock, flags);
739         while (!list_empty(&wdev->event_list)) {
740                 ev = list_first_entry(&wdev->event_list,
741                                       struct cfg80211_event, list);
742                 list_del(&ev->list);
743                 spin_unlock_irqrestore(&wdev->event_lock, flags);
744
745                 wdev_lock(wdev);
746                 switch (ev->type) {
747                 case EVENT_CONNECT_RESULT:
748                         if (!is_zero_ether_addr(ev->cr.bssid))
749                                 bssid = ev->cr.bssid;
750                         __cfg80211_connect_result(
751                                 wdev->netdev, bssid,
752                                 ev->cr.req_ie, ev->cr.req_ie_len,
753                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
754                                 ev->cr.status,
755                                 ev->cr.status == WLAN_STATUS_SUCCESS,
756                                 NULL);
757                         break;
758                 case EVENT_ROAMED:
759                         __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
760                                           ev->rm.req_ie_len, ev->rm.resp_ie,
761                                           ev->rm.resp_ie_len);
762                         break;
763                 case EVENT_DISCONNECTED:
764                         __cfg80211_disconnected(wdev->netdev,
765                                                 ev->dc.ie, ev->dc.ie_len,
766                                                 ev->dc.reason, true);
767                         break;
768                 case EVENT_IBSS_JOINED:
769                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
770                         break;
771                 }
772                 wdev_unlock(wdev);
773
774                 kfree(ev);
775
776                 spin_lock_irqsave(&wdev->event_lock, flags);
777         }
778         spin_unlock_irqrestore(&wdev->event_lock, flags);
779 }
780
781 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
782 {
783         struct wireless_dev *wdev;
784
785         ASSERT_RTNL();
786         ASSERT_RDEV_LOCK(rdev);
787
788         mutex_lock(&rdev->devlist_mtx);
789
790         list_for_each_entry(wdev, &rdev->wdev_list, list)
791                 cfg80211_process_wdev_events(wdev);
792
793         mutex_unlock(&rdev->devlist_mtx);
794 }
795
796 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
797                           struct net_device *dev, enum nl80211_iftype ntype,
798                           u32 *flags, struct vif_params *params)
799 {
800         int err;
801         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
802
803         ASSERT_RDEV_LOCK(rdev);
804
805         /* don't support changing VLANs, you just re-create them */
806         if (otype == NL80211_IFTYPE_AP_VLAN)
807                 return -EOPNOTSUPP;
808
809         /* cannot change into P2P device type */
810         if (ntype == NL80211_IFTYPE_P2P_DEVICE)
811                 return -EOPNOTSUPP;
812
813         if (!rdev->ops->change_virtual_intf ||
814             !(rdev->wiphy.interface_modes & (1 << ntype)))
815                 return -EOPNOTSUPP;
816
817         /* if it's part of a bridge, reject changing type to station/ibss */
818         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
819             (ntype == NL80211_IFTYPE_ADHOC ||
820              ntype == NL80211_IFTYPE_STATION ||
821              ntype == NL80211_IFTYPE_P2P_CLIENT))
822                 return -EBUSY;
823
824         if (ntype != otype && netif_running(dev)) {
825                 mutex_lock(&rdev->devlist_mtx);
826                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
827                                                     ntype);
828                 mutex_unlock(&rdev->devlist_mtx);
829                 if (err)
830                         return err;
831
832                 dev->ieee80211_ptr->use_4addr = false;
833                 dev->ieee80211_ptr->mesh_id_up_len = 0;
834
835                 switch (otype) {
836                 case NL80211_IFTYPE_AP:
837                         cfg80211_stop_ap(rdev, dev);
838                         break;
839                 case NL80211_IFTYPE_ADHOC:
840                         cfg80211_leave_ibss(rdev, dev, false);
841                         break;
842                 case NL80211_IFTYPE_STATION:
843                 case NL80211_IFTYPE_P2P_CLIENT:
844                         cfg80211_disconnect(rdev, dev,
845                                             WLAN_REASON_DEAUTH_LEAVING, true);
846                         break;
847                 case NL80211_IFTYPE_MESH_POINT:
848                         /* mesh should be handled? */
849                         break;
850                 default:
851                         break;
852                 }
853
854                 cfg80211_process_rdev_events(rdev);
855         }
856
857         err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
858
859         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
860
861         if (!err && params && params->use_4addr != -1)
862                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
863
864         if (!err) {
865                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
866                 switch (ntype) {
867                 case NL80211_IFTYPE_STATION:
868                         if (dev->ieee80211_ptr->use_4addr)
869                                 break;
870                         /* fall through */
871                 case NL80211_IFTYPE_P2P_CLIENT:
872                 case NL80211_IFTYPE_ADHOC:
873                         dev->priv_flags |= IFF_DONT_BRIDGE;
874                         break;
875                 case NL80211_IFTYPE_P2P_GO:
876                 case NL80211_IFTYPE_AP:
877                 case NL80211_IFTYPE_AP_VLAN:
878                 case NL80211_IFTYPE_WDS:
879                 case NL80211_IFTYPE_MESH_POINT:
880                         /* bridging OK */
881                         break;
882                 case NL80211_IFTYPE_MONITOR:
883                         /* monitor can't bridge anyway */
884                         break;
885                 case NL80211_IFTYPE_UNSPECIFIED:
886                 case NUM_NL80211_IFTYPES:
887                         /* not happening */
888                         break;
889                 case NL80211_IFTYPE_P2P_DEVICE:
890                         WARN_ON(1);
891                         break;
892                 }
893         }
894
895         if (!err && ntype != otype && netif_running(dev)) {
896                 cfg80211_update_iface_num(rdev, ntype, 1);
897                 cfg80211_update_iface_num(rdev, otype, -1);
898         }
899
900         return err;
901 }
902
903 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
904 {
905         static const u32 __mcs2bitrate[] = {
906                 /* control PHY */
907                 [0] =   275,
908                 /* SC PHY */
909                 [1] =  3850,
910                 [2] =  7700,
911                 [3] =  9625,
912                 [4] = 11550,
913                 [5] = 12512, /* 1251.25 mbps */
914                 [6] = 15400,
915                 [7] = 19250,
916                 [8] = 23100,
917                 [9] = 25025,
918                 [10] = 30800,
919                 [11] = 38500,
920                 [12] = 46200,
921                 /* OFDM PHY */
922                 [13] =  6930,
923                 [14] =  8662, /* 866.25 mbps */
924                 [15] = 13860,
925                 [16] = 17325,
926                 [17] = 20790,
927                 [18] = 27720,
928                 [19] = 34650,
929                 [20] = 41580,
930                 [21] = 45045,
931                 [22] = 51975,
932                 [23] = 62370,
933                 [24] = 67568, /* 6756.75 mbps */
934                 /* LP-SC PHY */
935                 [25] =  6260,
936                 [26] =  8340,
937                 [27] = 11120,
938                 [28] = 12510,
939                 [29] = 16680,
940                 [30] = 22240,
941                 [31] = 25030,
942         };
943
944         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
945                 return 0;
946
947         return __mcs2bitrate[rate->mcs];
948 }
949
950 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
951 {
952         static const u32 base[4][10] = {
953                 {   6500000,
954                    13000000,
955                    19500000,
956                    26000000,
957                    39000000,
958                    52000000,
959                    58500000,
960                    65000000,
961                    78000000,
962                    0,
963                 },
964                 {  13500000,
965                    27000000,
966                    40500000,
967                    54000000,
968                    81000000,
969                   108000000,
970                   121500000,
971                   135000000,
972                   162000000,
973                   180000000,
974                 },
975                 {  29300000,
976                    58500000,
977                    87800000,
978                   117000000,
979                   175500000,
980                   234000000,
981                   263300000,
982                   292500000,
983                   351000000,
984                   390000000,
985                 },
986                 {  58500000,
987                   117000000,
988                   175500000,
989                   234000000,
990                   351000000,
991                   468000000,
992                   526500000,
993                   585000000,
994                   702000000,
995                   780000000,
996                 },
997         };
998         u32 bitrate;
999         int idx;
1000
1001         if (WARN_ON_ONCE(rate->mcs > 9))
1002                 return 0;
1003
1004         idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1005                              RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1006                   rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1007                   rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1008
1009         bitrate = base[idx][rate->mcs];
1010         bitrate *= rate->nss;
1011
1012         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1013                 bitrate = (bitrate / 9) * 10;
1014
1015         /* do NOT round down here */
1016         return (bitrate + 50000) / 100000;
1017 }
1018
1019 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1020 {
1021         int modulation, streams, bitrate;
1022
1023         if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1024             !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1025                 return rate->legacy;
1026         if (rate->flags & RATE_INFO_FLAGS_60G)
1027                 return cfg80211_calculate_bitrate_60g(rate);
1028         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1029                 return cfg80211_calculate_bitrate_vht(rate);
1030
1031         /* the formula below does only work for MCS values smaller than 32 */
1032         if (WARN_ON_ONCE(rate->mcs >= 32))
1033                 return 0;
1034
1035         modulation = rate->mcs & 7;
1036         streams = (rate->mcs >> 3) + 1;
1037
1038         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1039                         13500000 : 6500000;
1040
1041         if (modulation < 4)
1042                 bitrate *= (modulation + 1);
1043         else if (modulation == 4)
1044                 bitrate *= (modulation + 2);
1045         else
1046                 bitrate *= (modulation + 3);
1047
1048         bitrate *= streams;
1049
1050         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1051                 bitrate = (bitrate / 9) * 10;
1052
1053         /* do NOT round down here */
1054         return (bitrate + 50000) / 100000;
1055 }
1056 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1057
1058 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1059                           enum ieee80211_p2p_attr_id attr,
1060                           u8 *buf, unsigned int bufsize)
1061 {
1062         u8 *out = buf;
1063         u16 attr_remaining = 0;
1064         bool desired_attr = false;
1065         u16 desired_len = 0;
1066
1067         while (len > 0) {
1068                 unsigned int iedatalen;
1069                 unsigned int copy;
1070                 const u8 *iedata;
1071
1072                 if (len < 2)
1073                         return -EILSEQ;
1074                 iedatalen = ies[1];
1075                 if (iedatalen + 2 > len)
1076                         return -EILSEQ;
1077
1078                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1079                         goto cont;
1080
1081                 if (iedatalen < 4)
1082                         goto cont;
1083
1084                 iedata = ies + 2;
1085
1086                 /* check WFA OUI, P2P subtype */
1087                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1088                     iedata[2] != 0x9a || iedata[3] != 0x09)
1089                         goto cont;
1090
1091                 iedatalen -= 4;
1092                 iedata += 4;
1093
1094                 /* check attribute continuation into this IE */
1095                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1096                 if (copy && desired_attr) {
1097                         desired_len += copy;
1098                         if (out) {
1099                                 memcpy(out, iedata, min(bufsize, copy));
1100                                 out += min(bufsize, copy);
1101                                 bufsize -= min(bufsize, copy);
1102                         }
1103
1104
1105                         if (copy == attr_remaining)
1106                                 return desired_len;
1107                 }
1108
1109                 attr_remaining -= copy;
1110                 if (attr_remaining)
1111                         goto cont;
1112
1113                 iedatalen -= copy;
1114                 iedata += copy;
1115
1116                 while (iedatalen > 0) {
1117                         u16 attr_len;
1118
1119                         /* P2P attribute ID & size must fit */
1120                         if (iedatalen < 3)
1121                                 return -EILSEQ;
1122                         desired_attr = iedata[0] == attr;
1123                         attr_len = get_unaligned_le16(iedata + 1);
1124                         iedatalen -= 3;
1125                         iedata += 3;
1126
1127                         copy = min_t(unsigned int, attr_len, iedatalen);
1128
1129                         if (desired_attr) {
1130                                 desired_len += copy;
1131                                 if (out) {
1132                                         memcpy(out, iedata, min(bufsize, copy));
1133                                         out += min(bufsize, copy);
1134                                         bufsize -= min(bufsize, copy);
1135                                 }
1136
1137                                 if (copy == attr_len)
1138                                         return desired_len;
1139                         }
1140
1141                         iedata += copy;
1142                         iedatalen -= copy;
1143                         attr_remaining = attr_len - copy;
1144                 }
1145
1146  cont:
1147                 len -= ies[1] + 2;
1148                 ies += ies[1] + 2;
1149         }
1150
1151         if (attr_remaining && desired_attr)
1152                 return -EILSEQ;
1153
1154         return -ENOENT;
1155 }
1156 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1157
1158 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1159                                  u32 beacon_int)
1160 {
1161         struct wireless_dev *wdev;
1162         int res = 0;
1163
1164         if (!beacon_int)
1165                 return -EINVAL;
1166
1167         mutex_lock(&rdev->devlist_mtx);
1168
1169         list_for_each_entry(wdev, &rdev->wdev_list, list) {
1170                 if (!wdev->beacon_interval)
1171                         continue;
1172                 if (wdev->beacon_interval != beacon_int) {
1173                         res = -EINVAL;
1174                         break;
1175                 }
1176         }
1177
1178         mutex_unlock(&rdev->devlist_mtx);
1179
1180         return res;
1181 }
1182
1183 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1184                                  struct wireless_dev *wdev,
1185                                  enum nl80211_iftype iftype,
1186                                  struct ieee80211_channel *chan,
1187                                  enum cfg80211_chan_mode chanmode,
1188                                  u8 radar_detect)
1189 {
1190         struct wireless_dev *wdev_iter;
1191         u32 used_iftypes = BIT(iftype);
1192         int num[NUM_NL80211_IFTYPES];
1193         struct ieee80211_channel
1194                         *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1195         struct ieee80211_channel *ch;
1196         enum cfg80211_chan_mode chmode;
1197         int num_different_channels = 0;
1198         int total = 1;
1199         bool radar_required;
1200         int i, j;
1201
1202         ASSERT_RTNL();
1203         lockdep_assert_held(&rdev->devlist_mtx);
1204
1205         if (WARN_ON(hweight32(radar_detect) > 1))
1206                 return -EINVAL;
1207
1208         switch (iftype) {
1209         case NL80211_IFTYPE_ADHOC:
1210         case NL80211_IFTYPE_AP:
1211         case NL80211_IFTYPE_AP_VLAN:
1212         case NL80211_IFTYPE_MESH_POINT:
1213         case NL80211_IFTYPE_P2P_GO:
1214         case NL80211_IFTYPE_WDS:
1215                 radar_required = !!(chan &&
1216                                     (chan->flags & IEEE80211_CHAN_RADAR));
1217                 break;
1218         case NL80211_IFTYPE_P2P_CLIENT:
1219         case NL80211_IFTYPE_STATION:
1220         case NL80211_IFTYPE_P2P_DEVICE:
1221         case NL80211_IFTYPE_MONITOR:
1222                 radar_required = false;
1223                 break;
1224         case NUM_NL80211_IFTYPES:
1225         case NL80211_IFTYPE_UNSPECIFIED:
1226         default:
1227                 return -EINVAL;
1228         }
1229
1230         if (radar_required && !radar_detect)
1231                 return -EINVAL;
1232
1233         /* Always allow software iftypes */
1234         if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1235                 if (radar_detect)
1236                         return -EINVAL;
1237                 return 0;
1238         }
1239
1240         memset(num, 0, sizeof(num));
1241         memset(used_channels, 0, sizeof(used_channels));
1242
1243         num[iftype] = 1;
1244
1245         switch (chanmode) {
1246         case CHAN_MODE_UNDEFINED:
1247                 break;
1248         case CHAN_MODE_SHARED:
1249                 WARN_ON(!chan);
1250                 used_channels[0] = chan;
1251                 num_different_channels++;
1252                 break;
1253         case CHAN_MODE_EXCLUSIVE:
1254                 num_different_channels++;
1255                 break;
1256         }
1257
1258         list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1259                 if (wdev_iter == wdev)
1260                         continue;
1261                 if (wdev_iter->netdev) {
1262                         if (!netif_running(wdev_iter->netdev))
1263                                 continue;
1264                 } else if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1265                         if (!wdev_iter->p2p_started)
1266                                 continue;
1267                 } else {
1268                         WARN_ON(1);
1269                 }
1270
1271                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1272                         continue;
1273
1274                 /*
1275                  * We may be holding the "wdev" mutex, but now need to lock
1276                  * wdev_iter. This is OK because once we get here wdev_iter
1277                  * is not wdev (tested above), but we need to use the nested
1278                  * locking for lockdep.
1279                  */
1280                 mutex_lock_nested(&wdev_iter->mtx, 1);
1281                 __acquire(wdev_iter->mtx);
1282                 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1283                 wdev_unlock(wdev_iter);
1284
1285                 switch (chmode) {
1286                 case CHAN_MODE_UNDEFINED:
1287                         break;
1288                 case CHAN_MODE_SHARED:
1289                         for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1290                                 if (!used_channels[i] || used_channels[i] == ch)
1291                                         break;
1292
1293                         if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1294                                 return -EBUSY;
1295
1296                         if (used_channels[i] == NULL) {
1297                                 used_channels[i] = ch;
1298                                 num_different_channels++;
1299                         }
1300                         break;
1301                 case CHAN_MODE_EXCLUSIVE:
1302                         num_different_channels++;
1303                         break;
1304                 }
1305
1306                 num[wdev_iter->iftype]++;
1307                 total++;
1308                 used_iftypes |= BIT(wdev_iter->iftype);
1309         }
1310
1311         if (total == 1 && !radar_detect)
1312                 return 0;
1313
1314         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1315                 const struct ieee80211_iface_combination *c;
1316                 struct ieee80211_iface_limit *limits;
1317                 u32 all_iftypes = 0;
1318
1319                 c = &rdev->wiphy.iface_combinations[i];
1320
1321                 if (total > c->max_interfaces)
1322                         continue;
1323                 if (num_different_channels > c->num_different_channels)
1324                         continue;
1325
1326                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1327                                  GFP_KERNEL);
1328                 if (!limits)
1329                         return -ENOMEM;
1330
1331                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1332                         if (rdev->wiphy.software_iftypes & BIT(iftype))
1333                                 continue;
1334                         for (j = 0; j < c->n_limits; j++) {
1335                                 all_iftypes |= limits[j].types;
1336                                 if (!(limits[j].types & BIT(iftype)))
1337                                         continue;
1338                                 if (limits[j].max < num[iftype])
1339                                         goto cont;
1340                                 limits[j].max -= num[iftype];
1341                         }
1342                 }
1343
1344                 if (radar_detect && !(c->radar_detect_widths & radar_detect))
1345                         goto cont;
1346
1347                 /*
1348                  * Finally check that all iftypes that we're currently
1349                  * using are actually part of this combination. If they
1350                  * aren't then we can't use this combination and have
1351                  * to continue to the next.
1352                  */
1353                 if ((all_iftypes & used_iftypes) != used_iftypes)
1354                         goto cont;
1355
1356                 /*
1357                  * This combination covered all interface types and
1358                  * supported the requested numbers, so we're good.
1359                  */
1360                 kfree(limits);
1361                 return 0;
1362  cont:
1363                 kfree(limits);
1364         }
1365
1366         return -EBUSY;
1367 }
1368
1369 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1370                            const u8 *rates, unsigned int n_rates,
1371                            u32 *mask)
1372 {
1373         int i, j;
1374
1375         if (!sband)
1376                 return -EINVAL;
1377
1378         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1379                 return -EINVAL;
1380
1381         *mask = 0;
1382
1383         for (i = 0; i < n_rates; i++) {
1384                 int rate = (rates[i] & 0x7f) * 5;
1385                 bool found = false;
1386
1387                 for (j = 0; j < sband->n_bitrates; j++) {
1388                         if (sband->bitrates[j].bitrate == rate) {
1389                                 found = true;
1390                                 *mask |= BIT(j);
1391                                 break;
1392                         }
1393                 }
1394                 if (!found)
1395                         return -EINVAL;
1396         }
1397
1398         /*
1399          * mask must have at least one bit set here since we
1400          * didn't accept a 0-length rates array nor allowed
1401          * entries in the array that didn't exist
1402          */
1403
1404         return 0;
1405 }
1406
1407 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1408 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1409 const unsigned char rfc1042_header[] __aligned(2) =
1410         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1411 EXPORT_SYMBOL(rfc1042_header);
1412
1413 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1414 const unsigned char bridge_tunnel_header[] __aligned(2) =
1415         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1416 EXPORT_SYMBOL(bridge_tunnel_header);