Merge branch 'for-linus' of git://github.com/richardweinberger/linux
[pandora-kernel.git] / net / wireless / util.c
1 /*
2  * Wireless utility functions
3  *
4  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
5  */
6 #include <linux/bitops.h>
7 #include <linux/etherdevice.h>
8 #include <linux/slab.h>
9 #include <linux/crc32.h>
10 #include <net/cfg80211.h>
11 #include <net/ip.h>
12 #include "core.h"
13
14 struct ieee80211_rate *
15 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
16                             u32 basic_rates, int bitrate)
17 {
18         struct ieee80211_rate *result = &sband->bitrates[0];
19         int i;
20
21         for (i = 0; i < sband->n_bitrates; i++) {
22                 if (!(basic_rates & BIT(i)))
23                         continue;
24                 if (sband->bitrates[i].bitrate > bitrate)
25                         continue;
26                 result = &sband->bitrates[i];
27         }
28
29         return result;
30 }
31 EXPORT_SYMBOL(ieee80211_get_response_rate);
32
33 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
34 {
35         /* see 802.11 17.3.8.3.2 and Annex J
36          * there are overlapping channel numbers in 5GHz and 2GHz bands */
37         if (band == IEEE80211_BAND_5GHZ) {
38                 if (chan >= 182 && chan <= 196)
39                         return 4000 + chan * 5;
40                 else
41                         return 5000 + chan * 5;
42         } else { /* IEEE80211_BAND_2GHZ */
43                 if (chan == 14)
44                         return 2484;
45                 else if (chan < 14)
46                         return 2407 + chan * 5;
47                 else
48                         return 0; /* not supported */
49         }
50 }
51 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
52
53 int ieee80211_frequency_to_channel(int freq)
54 {
55         /* see 802.11 17.3.8.3.2 and Annex J */
56         if (freq == 2484)
57                 return 14;
58         else if (freq < 2484)
59                 return (freq - 2407) / 5;
60         else if (freq >= 4910 && freq <= 4980)
61                 return (freq - 4000) / 5;
62         else
63                 return (freq - 5000) / 5;
64 }
65 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
66
67 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
68                                                   int freq)
69 {
70         enum ieee80211_band band;
71         struct ieee80211_supported_band *sband;
72         int i;
73
74         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
75                 sband = wiphy->bands[band];
76
77                 if (!sband)
78                         continue;
79
80                 for (i = 0; i < sband->n_channels; i++) {
81                         if (sband->channels[i].center_freq == freq)
82                                 return &sband->channels[i];
83                 }
84         }
85
86         return NULL;
87 }
88 EXPORT_SYMBOL(__ieee80211_get_channel);
89
90 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
91                                      enum ieee80211_band band)
92 {
93         int i, want;
94
95         switch (band) {
96         case IEEE80211_BAND_5GHZ:
97                 want = 3;
98                 for (i = 0; i < sband->n_bitrates; i++) {
99                         if (sband->bitrates[i].bitrate == 60 ||
100                             sband->bitrates[i].bitrate == 120 ||
101                             sband->bitrates[i].bitrate == 240) {
102                                 sband->bitrates[i].flags |=
103                                         IEEE80211_RATE_MANDATORY_A;
104                                 want--;
105                         }
106                 }
107                 WARN_ON(want);
108                 break;
109         case IEEE80211_BAND_2GHZ:
110                 want = 7;
111                 for (i = 0; i < sband->n_bitrates; i++) {
112                         if (sband->bitrates[i].bitrate == 10) {
113                                 sband->bitrates[i].flags |=
114                                         IEEE80211_RATE_MANDATORY_B |
115                                         IEEE80211_RATE_MANDATORY_G;
116                                 want--;
117                         }
118
119                         if (sband->bitrates[i].bitrate == 20 ||
120                             sband->bitrates[i].bitrate == 55 ||
121                             sband->bitrates[i].bitrate == 110 ||
122                             sband->bitrates[i].bitrate == 60 ||
123                             sband->bitrates[i].bitrate == 120 ||
124                             sband->bitrates[i].bitrate == 240) {
125                                 sband->bitrates[i].flags |=
126                                         IEEE80211_RATE_MANDATORY_G;
127                                 want--;
128                         }
129
130                         if (sband->bitrates[i].bitrate != 10 &&
131                             sband->bitrates[i].bitrate != 20 &&
132                             sband->bitrates[i].bitrate != 55 &&
133                             sband->bitrates[i].bitrate != 110)
134                                 sband->bitrates[i].flags |=
135                                         IEEE80211_RATE_ERP_G;
136                 }
137                 WARN_ON(want != 0 && want != 3 && want != 6);
138                 break;
139         case IEEE80211_NUM_BANDS:
140                 WARN_ON(1);
141                 break;
142         }
143 }
144
145 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
146 {
147         enum ieee80211_band band;
148
149         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
150                 if (wiphy->bands[band])
151                         set_mandatory_flags_band(wiphy->bands[band], band);
152 }
153
154 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
155 {
156         int i;
157         for (i = 0; i < wiphy->n_cipher_suites; i++)
158                 if (cipher == wiphy->cipher_suites[i])
159                         return true;
160         return false;
161 }
162
163 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
164                                    struct key_params *params, int key_idx,
165                                    bool pairwise, const u8 *mac_addr)
166 {
167         if (key_idx > 5)
168                 return -EINVAL;
169
170         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
171                 return -EINVAL;
172
173         if (pairwise && !mac_addr)
174                 return -EINVAL;
175
176         /*
177          * Disallow pairwise keys with non-zero index unless it's WEP
178          * or a vendor specific cipher (because current deployments use
179          * pairwise WEP keys with non-zero indices and for vendor specific
180          * ciphers this should be validated in the driver or hardware level
181          * - but 802.11i clearly specifies to use zero)
182          */
183         if (pairwise && key_idx &&
184             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
185              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
186              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
187                 return -EINVAL;
188
189         switch (params->cipher) {
190         case WLAN_CIPHER_SUITE_WEP40:
191                 if (params->key_len != WLAN_KEY_LEN_WEP40)
192                         return -EINVAL;
193                 break;
194         case WLAN_CIPHER_SUITE_TKIP:
195                 if (params->key_len != WLAN_KEY_LEN_TKIP)
196                         return -EINVAL;
197                 break;
198         case WLAN_CIPHER_SUITE_CCMP:
199                 if (params->key_len != WLAN_KEY_LEN_CCMP)
200                         return -EINVAL;
201                 break;
202         case WLAN_CIPHER_SUITE_WEP104:
203                 if (params->key_len != WLAN_KEY_LEN_WEP104)
204                         return -EINVAL;
205                 break;
206         case WLAN_CIPHER_SUITE_AES_CMAC:
207                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
208                         return -EINVAL;
209                 break;
210         default:
211                 /*
212                  * We don't know anything about this algorithm,
213                  * allow using it -- but the driver must check
214                  * all parameters! We still check below whether
215                  * or not the driver supports this algorithm,
216                  * of course.
217                  */
218                 break;
219         }
220
221         if (params->seq) {
222                 switch (params->cipher) {
223                 case WLAN_CIPHER_SUITE_WEP40:
224                 case WLAN_CIPHER_SUITE_WEP104:
225                         /* These ciphers do not use key sequence */
226                         return -EINVAL;
227                 case WLAN_CIPHER_SUITE_TKIP:
228                 case WLAN_CIPHER_SUITE_CCMP:
229                 case WLAN_CIPHER_SUITE_AES_CMAC:
230                         if (params->seq_len != 6)
231                                 return -EINVAL;
232                         break;
233                 }
234         }
235
236         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
237                 return -EINVAL;
238
239         return 0;
240 }
241
242 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
243 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
244 const unsigned char rfc1042_header[] __aligned(2) =
245         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
246 EXPORT_SYMBOL(rfc1042_header);
247
248 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
249 const unsigned char bridge_tunnel_header[] __aligned(2) =
250         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
251 EXPORT_SYMBOL(bridge_tunnel_header);
252
253 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
254 {
255         unsigned int hdrlen = 24;
256
257         if (ieee80211_is_data(fc)) {
258                 if (ieee80211_has_a4(fc))
259                         hdrlen = 30;
260                 if (ieee80211_is_data_qos(fc)) {
261                         hdrlen += IEEE80211_QOS_CTL_LEN;
262                         if (ieee80211_has_order(fc))
263                                 hdrlen += IEEE80211_HT_CTL_LEN;
264                 }
265                 goto out;
266         }
267
268         if (ieee80211_is_ctl(fc)) {
269                 /*
270                  * ACK and CTS are 10 bytes, all others 16. To see how
271                  * to get this condition consider
272                  *   subtype mask:   0b0000000011110000 (0x00F0)
273                  *   ACK subtype:    0b0000000011010000 (0x00D0)
274                  *   CTS subtype:    0b0000000011000000 (0x00C0)
275                  *   bits that matter:         ^^^      (0x00E0)
276                  *   value of those: 0b0000000011000000 (0x00C0)
277                  */
278                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
279                         hdrlen = 10;
280                 else
281                         hdrlen = 16;
282         }
283 out:
284         return hdrlen;
285 }
286 EXPORT_SYMBOL(ieee80211_hdrlen);
287
288 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
289 {
290         const struct ieee80211_hdr *hdr =
291                         (const struct ieee80211_hdr *)skb->data;
292         unsigned int hdrlen;
293
294         if (unlikely(skb->len < 10))
295                 return 0;
296         hdrlen = ieee80211_hdrlen(hdr->frame_control);
297         if (unlikely(hdrlen > skb->len))
298                 return 0;
299         return hdrlen;
300 }
301 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
302
303 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
304 {
305         int ae = meshhdr->flags & MESH_FLAGS_AE;
306         /* 7.1.3.5a.2 */
307         switch (ae) {
308         case 0:
309                 return 6;
310         case MESH_FLAGS_AE_A4:
311                 return 12;
312         case MESH_FLAGS_AE_A5_A6:
313                 return 18;
314         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
315                 return 24;
316         default:
317                 return 6;
318         }
319 }
320
321 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
322                            enum nl80211_iftype iftype)
323 {
324         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
325         u16 hdrlen, ethertype;
326         u8 *payload;
327         u8 dst[ETH_ALEN];
328         u8 src[ETH_ALEN] __aligned(2);
329
330         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
331                 return -1;
332
333         hdrlen = ieee80211_hdrlen(hdr->frame_control);
334
335         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
336          * header
337          * IEEE 802.11 address fields:
338          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
339          *   0     0   DA    SA    BSSID n/a
340          *   0     1   DA    BSSID SA    n/a
341          *   1     0   BSSID SA    DA    n/a
342          *   1     1   RA    TA    DA    SA
343          */
344         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
345         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
346
347         switch (hdr->frame_control &
348                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
349         case cpu_to_le16(IEEE80211_FCTL_TODS):
350                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
351                              iftype != NL80211_IFTYPE_AP_VLAN &&
352                              iftype != NL80211_IFTYPE_P2P_GO))
353                         return -1;
354                 break;
355         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
356                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
357                              iftype != NL80211_IFTYPE_MESH_POINT &&
358                              iftype != NL80211_IFTYPE_AP_VLAN &&
359                              iftype != NL80211_IFTYPE_STATION))
360                         return -1;
361                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
362                         struct ieee80211s_hdr *meshdr =
363                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
364                         /* make sure meshdr->flags is on the linear part */
365                         if (!pskb_may_pull(skb, hdrlen + 1))
366                                 return -1;
367                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
368                                 skb_copy_bits(skb, hdrlen +
369                                         offsetof(struct ieee80211s_hdr, eaddr1),
370                                         dst, ETH_ALEN);
371                                 skb_copy_bits(skb, hdrlen +
372                                         offsetof(struct ieee80211s_hdr, eaddr2),
373                                         src, ETH_ALEN);
374                         }
375                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
376                 }
377                 break;
378         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
379                 if ((iftype != NL80211_IFTYPE_STATION &&
380                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
381                      iftype != NL80211_IFTYPE_MESH_POINT) ||
382                     (is_multicast_ether_addr(dst) &&
383                      !compare_ether_addr(src, addr)))
384                         return -1;
385                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
386                         struct ieee80211s_hdr *meshdr =
387                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
388                         /* make sure meshdr->flags is on the linear part */
389                         if (!pskb_may_pull(skb, hdrlen + 1))
390                                 return -1;
391                         if (meshdr->flags & MESH_FLAGS_AE_A4)
392                                 skb_copy_bits(skb, hdrlen +
393                                         offsetof(struct ieee80211s_hdr, eaddr1),
394                                         src, ETH_ALEN);
395                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
396                 }
397                 break;
398         case cpu_to_le16(0):
399                 if (iftype != NL80211_IFTYPE_ADHOC &&
400                     iftype != NL80211_IFTYPE_STATION)
401                                 return -1;
402                 break;
403         }
404
405         if (!pskb_may_pull(skb, hdrlen + 8))
406                 return -1;
407
408         payload = skb->data + hdrlen;
409         ethertype = (payload[6] << 8) | payload[7];
410
411         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
412                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
413                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
414                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
415                  * replace EtherType */
416                 skb_pull(skb, hdrlen + 6);
417                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
418                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
419         } else {
420                 struct ethhdr *ehdr;
421                 __be16 len;
422
423                 skb_pull(skb, hdrlen);
424                 len = htons(skb->len);
425                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
426                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
427                 memcpy(ehdr->h_source, src, ETH_ALEN);
428                 ehdr->h_proto = len;
429         }
430         return 0;
431 }
432 EXPORT_SYMBOL(ieee80211_data_to_8023);
433
434 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
435                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
436 {
437         struct ieee80211_hdr hdr;
438         u16 hdrlen, ethertype;
439         __le16 fc;
440         const u8 *encaps_data;
441         int encaps_len, skip_header_bytes;
442         int nh_pos, h_pos;
443         int head_need;
444
445         if (unlikely(skb->len < ETH_HLEN))
446                 return -EINVAL;
447
448         nh_pos = skb_network_header(skb) - skb->data;
449         h_pos = skb_transport_header(skb) - skb->data;
450
451         /* convert Ethernet header to proper 802.11 header (based on
452          * operation mode) */
453         ethertype = (skb->data[12] << 8) | skb->data[13];
454         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
455
456         switch (iftype) {
457         case NL80211_IFTYPE_AP:
458         case NL80211_IFTYPE_AP_VLAN:
459         case NL80211_IFTYPE_P2P_GO:
460                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
461                 /* DA BSSID SA */
462                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
463                 memcpy(hdr.addr2, addr, ETH_ALEN);
464                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
465                 hdrlen = 24;
466                 break;
467         case NL80211_IFTYPE_STATION:
468         case NL80211_IFTYPE_P2P_CLIENT:
469                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
470                 /* BSSID SA DA */
471                 memcpy(hdr.addr1, bssid, ETH_ALEN);
472                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
473                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
474                 hdrlen = 24;
475                 break;
476         case NL80211_IFTYPE_ADHOC:
477                 /* DA SA BSSID */
478                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
479                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
480                 memcpy(hdr.addr3, bssid, ETH_ALEN);
481                 hdrlen = 24;
482                 break;
483         default:
484                 return -EOPNOTSUPP;
485         }
486
487         if (qos) {
488                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
489                 hdrlen += 2;
490         }
491
492         hdr.frame_control = fc;
493         hdr.duration_id = 0;
494         hdr.seq_ctrl = 0;
495
496         skip_header_bytes = ETH_HLEN;
497         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
498                 encaps_data = bridge_tunnel_header;
499                 encaps_len = sizeof(bridge_tunnel_header);
500                 skip_header_bytes -= 2;
501         } else if (ethertype > 0x600) {
502                 encaps_data = rfc1042_header;
503                 encaps_len = sizeof(rfc1042_header);
504                 skip_header_bytes -= 2;
505         } else {
506                 encaps_data = NULL;
507                 encaps_len = 0;
508         }
509
510         skb_pull(skb, skip_header_bytes);
511         nh_pos -= skip_header_bytes;
512         h_pos -= skip_header_bytes;
513
514         head_need = hdrlen + encaps_len - skb_headroom(skb);
515
516         if (head_need > 0 || skb_cloned(skb)) {
517                 head_need = max(head_need, 0);
518                 if (head_need)
519                         skb_orphan(skb);
520
521                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
522                         return -ENOMEM;
523
524                 skb->truesize += head_need;
525         }
526
527         if (encaps_data) {
528                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
529                 nh_pos += encaps_len;
530                 h_pos += encaps_len;
531         }
532
533         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
534
535         nh_pos += hdrlen;
536         h_pos += hdrlen;
537
538         /* Update skb pointers to various headers since this modified frame
539          * is going to go through Linux networking code that may potentially
540          * need things like pointer to IP header. */
541         skb_set_mac_header(skb, 0);
542         skb_set_network_header(skb, nh_pos);
543         skb_set_transport_header(skb, h_pos);
544
545         return 0;
546 }
547 EXPORT_SYMBOL(ieee80211_data_from_8023);
548
549
550 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
551                               const u8 *addr, enum nl80211_iftype iftype,
552                               const unsigned int extra_headroom,
553                               bool has_80211_header)
554 {
555         struct sk_buff *frame = NULL;
556         u16 ethertype;
557         u8 *payload;
558         const struct ethhdr *eth;
559         int remaining, err;
560         u8 dst[ETH_ALEN], src[ETH_ALEN];
561
562         if (has_80211_header) {
563                 err = ieee80211_data_to_8023(skb, addr, iftype);
564                 if (err)
565                         goto out;
566
567                 /* skip the wrapping header */
568                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
569                 if (!eth)
570                         goto out;
571         } else {
572                 eth = (struct ethhdr *) skb->data;
573         }
574
575         while (skb != frame) {
576                 u8 padding;
577                 __be16 len = eth->h_proto;
578                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
579
580                 remaining = skb->len;
581                 memcpy(dst, eth->h_dest, ETH_ALEN);
582                 memcpy(src, eth->h_source, ETH_ALEN);
583
584                 padding = (4 - subframe_len) & 0x3;
585                 /* the last MSDU has no padding */
586                 if (subframe_len > remaining)
587                         goto purge;
588
589                 skb_pull(skb, sizeof(struct ethhdr));
590                 /* reuse skb for the last subframe */
591                 if (remaining <= subframe_len + padding)
592                         frame = skb;
593                 else {
594                         unsigned int hlen = ALIGN(extra_headroom, 4);
595                         /*
596                          * Allocate and reserve two bytes more for payload
597                          * alignment since sizeof(struct ethhdr) is 14.
598                          */
599                         frame = dev_alloc_skb(hlen + subframe_len + 2);
600                         if (!frame)
601                                 goto purge;
602
603                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
604                         memcpy(skb_put(frame, ntohs(len)), skb->data,
605                                 ntohs(len));
606
607                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
608                                                         padding);
609                         if (!eth) {
610                                 dev_kfree_skb(frame);
611                                 goto purge;
612                         }
613                 }
614
615                 skb_reset_network_header(frame);
616                 frame->dev = skb->dev;
617                 frame->priority = skb->priority;
618
619                 payload = frame->data;
620                 ethertype = (payload[6] << 8) | payload[7];
621
622                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
623                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
624                            compare_ether_addr(payload,
625                                               bridge_tunnel_header) == 0)) {
626                         /* remove RFC1042 or Bridge-Tunnel
627                          * encapsulation and replace EtherType */
628                         skb_pull(frame, 6);
629                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
630                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
631                 } else {
632                         memcpy(skb_push(frame, sizeof(__be16)), &len,
633                                 sizeof(__be16));
634                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
635                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
636                 }
637                 __skb_queue_tail(list, frame);
638         }
639
640         return;
641
642  purge:
643         __skb_queue_purge(list);
644  out:
645         dev_kfree_skb(skb);
646 }
647 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
648
649 /* Given a data frame determine the 802.1p/1d tag to use. */
650 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
651 {
652         unsigned int dscp;
653
654         /* skb->priority values from 256->263 are magic values to
655          * directly indicate a specific 802.1d priority.  This is used
656          * to allow 802.1d priority to be passed directly in from VLAN
657          * tags, etc.
658          */
659         if (skb->priority >= 256 && skb->priority <= 263)
660                 return skb->priority - 256;
661
662         switch (skb->protocol) {
663         case htons(ETH_P_IP):
664                 dscp = ip_hdr(skb)->tos & 0xfc;
665                 break;
666         default:
667                 return 0;
668         }
669
670         return dscp >> 5;
671 }
672 EXPORT_SYMBOL(cfg80211_classify8021d);
673
674 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
675 {
676         u8 *end, *pos;
677
678         pos = bss->information_elements;
679         if (pos == NULL)
680                 return NULL;
681         end = pos + bss->len_information_elements;
682
683         while (pos + 1 < end) {
684                 if (pos + 2 + pos[1] > end)
685                         break;
686                 if (pos[0] == ie)
687                         return pos;
688                 pos += 2 + pos[1];
689         }
690
691         return NULL;
692 }
693 EXPORT_SYMBOL(ieee80211_bss_get_ie);
694
695 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
696 {
697         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
698         struct net_device *dev = wdev->netdev;
699         int i;
700
701         if (!wdev->connect_keys)
702                 return;
703
704         for (i = 0; i < 6; i++) {
705                 if (!wdev->connect_keys->params[i].cipher)
706                         continue;
707                 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
708                                         &wdev->connect_keys->params[i])) {
709                         netdev_err(dev, "failed to set key %d\n", i);
710                         continue;
711                 }
712                 if (wdev->connect_keys->def == i)
713                         if (rdev->ops->set_default_key(wdev->wiphy, dev,
714                                                        i, true, true)) {
715                                 netdev_err(dev, "failed to set defkey %d\n", i);
716                                 continue;
717                         }
718                 if (wdev->connect_keys->defmgmt == i)
719                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
720                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
721         }
722
723         kfree(wdev->connect_keys);
724         wdev->connect_keys = NULL;
725 }
726
727 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
728 {
729         struct cfg80211_event *ev;
730         unsigned long flags;
731         const u8 *bssid = NULL;
732
733         spin_lock_irqsave(&wdev->event_lock, flags);
734         while (!list_empty(&wdev->event_list)) {
735                 ev = list_first_entry(&wdev->event_list,
736                                       struct cfg80211_event, list);
737                 list_del(&ev->list);
738                 spin_unlock_irqrestore(&wdev->event_lock, flags);
739
740                 wdev_lock(wdev);
741                 switch (ev->type) {
742                 case EVENT_CONNECT_RESULT:
743                         if (!is_zero_ether_addr(ev->cr.bssid))
744                                 bssid = ev->cr.bssid;
745                         __cfg80211_connect_result(
746                                 wdev->netdev, bssid,
747                                 ev->cr.req_ie, ev->cr.req_ie_len,
748                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
749                                 ev->cr.status,
750                                 ev->cr.status == WLAN_STATUS_SUCCESS,
751                                 NULL);
752                         break;
753                 case EVENT_ROAMED:
754                         __cfg80211_roamed(wdev, ev->rm.channel, ev->rm.bssid,
755                                           ev->rm.req_ie, ev->rm.req_ie_len,
756                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
757                         break;
758                 case EVENT_DISCONNECTED:
759                         __cfg80211_disconnected(wdev->netdev,
760                                                 ev->dc.ie, ev->dc.ie_len,
761                                                 ev->dc.reason, true);
762                         break;
763                 case EVENT_IBSS_JOINED:
764                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
765                         break;
766                 }
767                 wdev_unlock(wdev);
768
769                 kfree(ev);
770
771                 spin_lock_irqsave(&wdev->event_lock, flags);
772         }
773         spin_unlock_irqrestore(&wdev->event_lock, flags);
774 }
775
776 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
777 {
778         struct wireless_dev *wdev;
779
780         ASSERT_RTNL();
781         ASSERT_RDEV_LOCK(rdev);
782
783         mutex_lock(&rdev->devlist_mtx);
784
785         list_for_each_entry(wdev, &rdev->netdev_list, list)
786                 cfg80211_process_wdev_events(wdev);
787
788         mutex_unlock(&rdev->devlist_mtx);
789 }
790
791 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
792                           struct net_device *dev, enum nl80211_iftype ntype,
793                           u32 *flags, struct vif_params *params)
794 {
795         int err;
796         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
797
798         ASSERT_RDEV_LOCK(rdev);
799
800         /* don't support changing VLANs, you just re-create them */
801         if (otype == NL80211_IFTYPE_AP_VLAN)
802                 return -EOPNOTSUPP;
803
804         if (!rdev->ops->change_virtual_intf ||
805             !(rdev->wiphy.interface_modes & (1 << ntype)))
806                 return -EOPNOTSUPP;
807
808         /* if it's part of a bridge, reject changing type to station/ibss */
809         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
810             (ntype == NL80211_IFTYPE_ADHOC ||
811              ntype == NL80211_IFTYPE_STATION ||
812              ntype == NL80211_IFTYPE_P2P_CLIENT))
813                 return -EBUSY;
814
815         if (ntype != otype) {
816                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
817                                                     ntype);
818                 if (err)
819                         return err;
820
821                 dev->ieee80211_ptr->use_4addr = false;
822                 dev->ieee80211_ptr->mesh_id_up_len = 0;
823
824                 switch (otype) {
825                 case NL80211_IFTYPE_ADHOC:
826                         cfg80211_leave_ibss(rdev, dev, false);
827                         break;
828                 case NL80211_IFTYPE_STATION:
829                 case NL80211_IFTYPE_P2P_CLIENT:
830                         cfg80211_disconnect(rdev, dev,
831                                             WLAN_REASON_DEAUTH_LEAVING, true);
832                         break;
833                 case NL80211_IFTYPE_MESH_POINT:
834                         /* mesh should be handled? */
835                         break;
836                 default:
837                         break;
838                 }
839
840                 cfg80211_process_rdev_events(rdev);
841         }
842
843         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
844                                              ntype, flags, params);
845
846         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
847
848         if (!err && params && params->use_4addr != -1)
849                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
850
851         if (!err) {
852                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
853                 switch (ntype) {
854                 case NL80211_IFTYPE_STATION:
855                         if (dev->ieee80211_ptr->use_4addr)
856                                 break;
857                         /* fall through */
858                 case NL80211_IFTYPE_P2P_CLIENT:
859                 case NL80211_IFTYPE_ADHOC:
860                         dev->priv_flags |= IFF_DONT_BRIDGE;
861                         break;
862                 case NL80211_IFTYPE_P2P_GO:
863                 case NL80211_IFTYPE_AP:
864                 case NL80211_IFTYPE_AP_VLAN:
865                 case NL80211_IFTYPE_WDS:
866                 case NL80211_IFTYPE_MESH_POINT:
867                         /* bridging OK */
868                         break;
869                 case NL80211_IFTYPE_MONITOR:
870                         /* monitor can't bridge anyway */
871                         break;
872                 case NL80211_IFTYPE_UNSPECIFIED:
873                 case NUM_NL80211_IFTYPES:
874                         /* not happening */
875                         break;
876                 }
877         }
878
879         return err;
880 }
881
882 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
883 {
884         int modulation, streams, bitrate;
885
886         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
887                 return rate->legacy;
888
889         /* the formula below does only work for MCS values smaller than 32 */
890         if (rate->mcs >= 32)
891                 return 0;
892
893         modulation = rate->mcs & 7;
894         streams = (rate->mcs >> 3) + 1;
895
896         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
897                         13500000 : 6500000;
898
899         if (modulation < 4)
900                 bitrate *= (modulation + 1);
901         else if (modulation == 4)
902                 bitrate *= (modulation + 2);
903         else
904                 bitrate *= (modulation + 3);
905
906         bitrate *= streams;
907
908         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
909                 bitrate = (bitrate / 9) * 10;
910
911         /* do NOT round down here */
912         return (bitrate + 50000) / 100000;
913 }
914
915 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
916                                  u32 beacon_int)
917 {
918         struct wireless_dev *wdev;
919         int res = 0;
920
921         if (!beacon_int)
922                 return -EINVAL;
923
924         mutex_lock(&rdev->devlist_mtx);
925
926         list_for_each_entry(wdev, &rdev->netdev_list, list) {
927                 if (!wdev->beacon_interval)
928                         continue;
929                 if (wdev->beacon_interval != beacon_int) {
930                         res = -EINVAL;
931                         break;
932                 }
933         }
934
935         mutex_unlock(&rdev->devlist_mtx);
936
937         return res;
938 }
939
940 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
941                                   struct wireless_dev *wdev,
942                                   enum nl80211_iftype iftype)
943 {
944         struct wireless_dev *wdev_iter;
945         int num[NUM_NL80211_IFTYPES];
946         int total = 1;
947         int i, j;
948
949         ASSERT_RTNL();
950
951         /* Always allow software iftypes */
952         if (rdev->wiphy.software_iftypes & BIT(iftype))
953                 return 0;
954
955         /*
956          * Drivers will gradually all set this flag, until all
957          * have it we only enforce for those that set it.
958          */
959         if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS))
960                 return 0;
961
962         memset(num, 0, sizeof(num));
963
964         num[iftype] = 1;
965
966         mutex_lock(&rdev->devlist_mtx);
967         list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
968                 if (wdev_iter == wdev)
969                         continue;
970                 if (!netif_running(wdev_iter->netdev))
971                         continue;
972
973                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
974                         continue;
975
976                 num[wdev_iter->iftype]++;
977                 total++;
978         }
979         mutex_unlock(&rdev->devlist_mtx);
980
981         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
982                 const struct ieee80211_iface_combination *c;
983                 struct ieee80211_iface_limit *limits;
984
985                 c = &rdev->wiphy.iface_combinations[i];
986
987                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
988                                  GFP_KERNEL);
989                 if (!limits)
990                         return -ENOMEM;
991                 if (total > c->max_interfaces)
992                         goto cont;
993
994                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
995                         if (rdev->wiphy.software_iftypes & BIT(iftype))
996                                 continue;
997                         for (j = 0; j < c->n_limits; j++) {
998                                 if (!(limits[j].types & iftype))
999                                         continue;
1000                                 if (limits[j].max < num[iftype])
1001                                         goto cont;
1002                                 limits[j].max -= num[iftype];
1003                         }
1004                 }
1005                 /* yay, it fits */
1006                 kfree(limits);
1007                 return 0;
1008  cont:
1009                 kfree(limits);
1010         }
1011
1012         return -EBUSY;
1013 }
1014
1015 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1016                            const u8 *rates, unsigned int n_rates,
1017                            u32 *mask)
1018 {
1019         int i, j;
1020
1021         if (!sband)
1022                 return -EINVAL;
1023
1024         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1025                 return -EINVAL;
1026
1027         *mask = 0;
1028
1029         for (i = 0; i < n_rates; i++) {
1030                 int rate = (rates[i] & 0x7f) * 5;
1031                 bool found = false;
1032
1033                 for (j = 0; j < sband->n_bitrates; j++) {
1034                         if (sband->bitrates[j].bitrate == rate) {
1035                                 found = true;
1036                                 *mask |= BIT(j);
1037                                 break;
1038                         }
1039                 }
1040                 if (!found)
1041                         return -EINVAL;
1042         }
1043
1044         /*
1045          * mask must have at least one bit set here since we
1046          * didn't accept a 0-length rates array nor allowed
1047          * entries in the array that didn't exist
1048          */
1049
1050         return 0;
1051 }
1052
1053 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
1054                                struct ieee802_11_elems *elems,
1055                                u64 filter, u32 crc)
1056 {
1057         size_t left = len;
1058         u8 *pos = start;
1059         bool calc_crc = filter != 0;
1060
1061         memset(elems, 0, sizeof(*elems));
1062         elems->ie_start = start;
1063         elems->total_len = len;
1064
1065         while (left >= 2) {
1066                 u8 id, elen;
1067
1068                 id = *pos++;
1069                 elen = *pos++;
1070                 left -= 2;
1071
1072                 if (elen > left)
1073                         break;
1074
1075                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
1076                         crc = crc32_be(crc, pos - 2, elen + 2);
1077
1078                 switch (id) {
1079                 case WLAN_EID_SSID:
1080                         elems->ssid = pos;
1081                         elems->ssid_len = elen;
1082                         break;
1083                 case WLAN_EID_SUPP_RATES:
1084                         elems->supp_rates = pos;
1085                         elems->supp_rates_len = elen;
1086                         break;
1087                 case WLAN_EID_FH_PARAMS:
1088                         elems->fh_params = pos;
1089                         elems->fh_params_len = elen;
1090                         break;
1091                 case WLAN_EID_DS_PARAMS:
1092                         elems->ds_params = pos;
1093                         elems->ds_params_len = elen;
1094                         break;
1095                 case WLAN_EID_CF_PARAMS:
1096                         elems->cf_params = pos;
1097                         elems->cf_params_len = elen;
1098                         break;
1099                 case WLAN_EID_TIM:
1100                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
1101                                 elems->tim = (void *)pos;
1102                                 elems->tim_len = elen;
1103                         }
1104                         break;
1105                 case WLAN_EID_IBSS_PARAMS:
1106                         elems->ibss_params = pos;
1107                         elems->ibss_params_len = elen;
1108                         break;
1109                 case WLAN_EID_CHALLENGE:
1110                         elems->challenge = pos;
1111                         elems->challenge_len = elen;
1112                         break;
1113                 case WLAN_EID_VENDOR_SPECIFIC:
1114                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
1115                             pos[2] == 0xf2) {
1116                                 /* Microsoft OUI (00:50:F2) */
1117
1118                                 if (calc_crc)
1119                                         crc = crc32_be(crc, pos - 2, elen + 2);
1120
1121                                 if (pos[3] == 1) {
1122                                         /* OUI Type 1 - WPA IE */
1123                                         elems->wpa = pos;
1124                                         elems->wpa_len = elen;
1125                                 } else if (elen >= 5 && pos[3] == 2) {
1126                                         /* OUI Type 2 - WMM IE */
1127                                         if (pos[4] == 0) {
1128                                                 elems->wmm_info = pos;
1129                                                 elems->wmm_info_len = elen;
1130                                         } else if (pos[4] == 1) {
1131                                                 elems->wmm_param = pos;
1132                                                 elems->wmm_param_len = elen;
1133                                         }
1134                                 }
1135                         }
1136                         break;
1137                 case WLAN_EID_RSN:
1138                         elems->rsn = pos;
1139                         elems->rsn_len = elen;
1140                         break;
1141                 case WLAN_EID_ERP_INFO:
1142                         elems->erp_info = pos;
1143                         elems->erp_info_len = elen;
1144                         break;
1145                 case WLAN_EID_EXT_SUPP_RATES:
1146                         elems->ext_supp_rates = pos;
1147                         elems->ext_supp_rates_len = elen;
1148                         break;
1149                 case WLAN_EID_HT_CAPABILITY:
1150                         if (elen >= sizeof(struct ieee80211_ht_cap))
1151                                 elems->ht_cap_elem = (void *)pos;
1152                         break;
1153                 case WLAN_EID_HT_INFORMATION:
1154                         if (elen >= sizeof(struct ieee80211_ht_info))
1155                                 elems->ht_info_elem = (void *)pos;
1156                         break;
1157                 case WLAN_EID_MESH_ID:
1158                         elems->mesh_id = pos;
1159                         elems->mesh_id_len = elen;
1160                         break;
1161                 case WLAN_EID_MESH_CONFIG:
1162                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
1163                                 elems->mesh_config = (void *)pos;
1164                         break;
1165                 case WLAN_EID_PEER_MGMT:
1166                         elems->peering = pos;
1167                         elems->peering_len = elen;
1168                         break;
1169                 case WLAN_EID_PREQ:
1170                         elems->preq = pos;
1171                         elems->preq_len = elen;
1172                         break;
1173                 case WLAN_EID_PREP:
1174                         elems->prep = pos;
1175                         elems->prep_len = elen;
1176                         break;
1177                 case WLAN_EID_PERR:
1178                         elems->perr = pos;
1179                         elems->perr_len = elen;
1180                         break;
1181                 case WLAN_EID_RANN:
1182                         if (elen >= sizeof(struct ieee80211_rann_ie))
1183                                 elems->rann = (void *)pos;
1184                         break;
1185                 case WLAN_EID_CHANNEL_SWITCH:
1186                         elems->ch_switch_elem = pos;
1187                         elems->ch_switch_elem_len = elen;
1188                         break;
1189                 case WLAN_EID_QUIET:
1190                         if (!elems->quiet_elem) {
1191                                 elems->quiet_elem = pos;
1192                                 elems->quiet_elem_len = elen;
1193                         }
1194                         elems->num_of_quiet_elem++;
1195                         break;
1196                 case WLAN_EID_COUNTRY:
1197                         elems->country_elem = pos;
1198                         elems->country_elem_len = elen;
1199                         break;
1200                 case WLAN_EID_PWR_CONSTRAINT:
1201                         elems->pwr_constr_elem = pos;
1202                         elems->pwr_constr_elem_len = elen;
1203                         break;
1204                 case WLAN_EID_TIMEOUT_INTERVAL:
1205                         elems->timeout_int = pos;
1206                         elems->timeout_int_len = elen;
1207                         break;
1208                 default:
1209                         break;
1210                 }
1211
1212                 left -= elen;
1213                 pos += elen;
1214         }
1215
1216         return crc;
1217 }
1218 EXPORT_SYMBOL(ieee802_11_parse_elems_crc);