nl80211/mac80211: define and allow configuring mesh element TTL
[linux-2.6.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 <net/cfg80211.h>
10 #include <net/ip.h>
11 #include "core.h"
12
13 struct ieee80211_rate *
14 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
15                             u32 basic_rates, int bitrate)
16 {
17         struct ieee80211_rate *result = &sband->bitrates[0];
18         int i;
19
20         for (i = 0; i < sband->n_bitrates; i++) {
21                 if (!(basic_rates & BIT(i)))
22                         continue;
23                 if (sband->bitrates[i].bitrate > bitrate)
24                         continue;
25                 result = &sband->bitrates[i];
26         }
27
28         return result;
29 }
30 EXPORT_SYMBOL(ieee80211_get_response_rate);
31
32 int ieee80211_channel_to_frequency(int chan)
33 {
34         if (chan < 14)
35                 return 2407 + chan * 5;
36
37         if (chan == 14)
38                 return 2484;
39
40         /* FIXME: 802.11j 17.3.8.3.2 */
41         return (chan + 1000) * 5;
42 }
43 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
44
45 int ieee80211_frequency_to_channel(int freq)
46 {
47         if (freq == 2484)
48                 return 14;
49
50         if (freq < 2484)
51                 return (freq - 2407) / 5;
52
53         /* FIXME: 802.11j 17.3.8.3.2 */
54         return freq/5 - 1000;
55 }
56 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
57
58 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
59                                                   int freq)
60 {
61         enum ieee80211_band band;
62         struct ieee80211_supported_band *sband;
63         int i;
64
65         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
66                 sband = wiphy->bands[band];
67
68                 if (!sband)
69                         continue;
70
71                 for (i = 0; i < sband->n_channels; i++) {
72                         if (sband->channels[i].center_freq == freq)
73                                 return &sband->channels[i];
74                 }
75         }
76
77         return NULL;
78 }
79 EXPORT_SYMBOL(__ieee80211_get_channel);
80
81 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
82                                      enum ieee80211_band band)
83 {
84         int i, want;
85
86         switch (band) {
87         case IEEE80211_BAND_5GHZ:
88                 want = 3;
89                 for (i = 0; i < sband->n_bitrates; i++) {
90                         if (sband->bitrates[i].bitrate == 60 ||
91                             sband->bitrates[i].bitrate == 120 ||
92                             sband->bitrates[i].bitrate == 240) {
93                                 sband->bitrates[i].flags |=
94                                         IEEE80211_RATE_MANDATORY_A;
95                                 want--;
96                         }
97                 }
98                 WARN_ON(want);
99                 break;
100         case IEEE80211_BAND_2GHZ:
101                 want = 7;
102                 for (i = 0; i < sband->n_bitrates; i++) {
103                         if (sband->bitrates[i].bitrate == 10) {
104                                 sband->bitrates[i].flags |=
105                                         IEEE80211_RATE_MANDATORY_B |
106                                         IEEE80211_RATE_MANDATORY_G;
107                                 want--;
108                         }
109
110                         if (sband->bitrates[i].bitrate == 20 ||
111                             sband->bitrates[i].bitrate == 55 ||
112                             sband->bitrates[i].bitrate == 110 ||
113                             sband->bitrates[i].bitrate == 60 ||
114                             sband->bitrates[i].bitrate == 120 ||
115                             sband->bitrates[i].bitrate == 240) {
116                                 sband->bitrates[i].flags |=
117                                         IEEE80211_RATE_MANDATORY_G;
118                                 want--;
119                         }
120
121                         if (sband->bitrates[i].bitrate != 10 &&
122                             sband->bitrates[i].bitrate != 20 &&
123                             sband->bitrates[i].bitrate != 55 &&
124                             sband->bitrates[i].bitrate != 110)
125                                 sband->bitrates[i].flags |=
126                                         IEEE80211_RATE_ERP_G;
127                 }
128                 WARN_ON(want != 0 && want != 3 && want != 6);
129                 break;
130         case IEEE80211_NUM_BANDS:
131                 WARN_ON(1);
132                 break;
133         }
134 }
135
136 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
137 {
138         enum ieee80211_band band;
139
140         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
141                 if (wiphy->bands[band])
142                         set_mandatory_flags_band(wiphy->bands[band], band);
143 }
144
145 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
146                                    struct key_params *params, int key_idx,
147                                    bool pairwise, const u8 *mac_addr)
148 {
149         int i;
150
151         if (key_idx > 5)
152                 return -EINVAL;
153
154         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
155                 return -EINVAL;
156
157         if (pairwise && !mac_addr)
158                 return -EINVAL;
159
160         /*
161          * Disallow pairwise keys with non-zero index unless it's WEP
162          * (because current deployments use pairwise WEP keys with
163          * non-zero indizes but 802.11i clearly specifies to use zero)
164          */
165         if (pairwise && key_idx &&
166             params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
167             params->cipher != WLAN_CIPHER_SUITE_WEP104)
168                 return -EINVAL;
169
170         switch (params->cipher) {
171         case WLAN_CIPHER_SUITE_WEP40:
172                 if (params->key_len != WLAN_KEY_LEN_WEP40)
173                         return -EINVAL;
174                 break;
175         case WLAN_CIPHER_SUITE_TKIP:
176                 if (params->key_len != WLAN_KEY_LEN_TKIP)
177                         return -EINVAL;
178                 break;
179         case WLAN_CIPHER_SUITE_CCMP:
180                 if (params->key_len != WLAN_KEY_LEN_CCMP)
181                         return -EINVAL;
182                 break;
183         case WLAN_CIPHER_SUITE_WEP104:
184                 if (params->key_len != WLAN_KEY_LEN_WEP104)
185                         return -EINVAL;
186                 break;
187         case WLAN_CIPHER_SUITE_AES_CMAC:
188                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
189                         return -EINVAL;
190                 break;
191         default:
192                 /*
193                  * We don't know anything about this algorithm,
194                  * allow using it -- but the driver must check
195                  * all parameters! We still check below whether
196                  * or not the driver supports this algorithm,
197                  * of course.
198                  */
199                 break;
200         }
201
202         if (params->seq) {
203                 switch (params->cipher) {
204                 case WLAN_CIPHER_SUITE_WEP40:
205                 case WLAN_CIPHER_SUITE_WEP104:
206                         /* These ciphers do not use key sequence */
207                         return -EINVAL;
208                 case WLAN_CIPHER_SUITE_TKIP:
209                 case WLAN_CIPHER_SUITE_CCMP:
210                 case WLAN_CIPHER_SUITE_AES_CMAC:
211                         if (params->seq_len != 6)
212                                 return -EINVAL;
213                         break;
214                 }
215         }
216
217         for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
218                 if (params->cipher == rdev->wiphy.cipher_suites[i])
219                         break;
220         if (i == rdev->wiphy.n_cipher_suites)
221                 return -EINVAL;
222
223         return 0;
224 }
225
226 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
227 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
228 const unsigned char rfc1042_header[] __aligned(2) =
229         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
230 EXPORT_SYMBOL(rfc1042_header);
231
232 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
233 const unsigned char bridge_tunnel_header[] __aligned(2) =
234         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
235 EXPORT_SYMBOL(bridge_tunnel_header);
236
237 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
238 {
239         unsigned int hdrlen = 24;
240
241         if (ieee80211_is_data(fc)) {
242                 if (ieee80211_has_a4(fc))
243                         hdrlen = 30;
244                 if (ieee80211_is_data_qos(fc)) {
245                         hdrlen += IEEE80211_QOS_CTL_LEN;
246                         if (ieee80211_has_order(fc))
247                                 hdrlen += IEEE80211_HT_CTL_LEN;
248                 }
249                 goto out;
250         }
251
252         if (ieee80211_is_ctl(fc)) {
253                 /*
254                  * ACK and CTS are 10 bytes, all others 16. To see how
255                  * to get this condition consider
256                  *   subtype mask:   0b0000000011110000 (0x00F0)
257                  *   ACK subtype:    0b0000000011010000 (0x00D0)
258                  *   CTS subtype:    0b0000000011000000 (0x00C0)
259                  *   bits that matter:         ^^^      (0x00E0)
260                  *   value of those: 0b0000000011000000 (0x00C0)
261                  */
262                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
263                         hdrlen = 10;
264                 else
265                         hdrlen = 16;
266         }
267 out:
268         return hdrlen;
269 }
270 EXPORT_SYMBOL(ieee80211_hdrlen);
271
272 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
273 {
274         const struct ieee80211_hdr *hdr =
275                         (const struct ieee80211_hdr *)skb->data;
276         unsigned int hdrlen;
277
278         if (unlikely(skb->len < 10))
279                 return 0;
280         hdrlen = ieee80211_hdrlen(hdr->frame_control);
281         if (unlikely(hdrlen > skb->len))
282                 return 0;
283         return hdrlen;
284 }
285 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
286
287 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
288 {
289         int ae = meshhdr->flags & MESH_FLAGS_AE;
290         /* 7.1.3.5a.2 */
291         switch (ae) {
292         case 0:
293                 return 6;
294         case MESH_FLAGS_AE_A4:
295                 return 12;
296         case MESH_FLAGS_AE_A5_A6:
297                 return 18;
298         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
299                 return 24;
300         default:
301                 return 6;
302         }
303 }
304
305 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
306                            enum nl80211_iftype iftype)
307 {
308         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
309         u16 hdrlen, ethertype;
310         u8 *payload;
311         u8 dst[ETH_ALEN];
312         u8 src[ETH_ALEN] __aligned(2);
313
314         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
315                 return -1;
316
317         hdrlen = ieee80211_hdrlen(hdr->frame_control);
318
319         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
320          * header
321          * IEEE 802.11 address fields:
322          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
323          *   0     0   DA    SA    BSSID n/a
324          *   0     1   DA    BSSID SA    n/a
325          *   1     0   BSSID SA    DA    n/a
326          *   1     1   RA    TA    DA    SA
327          */
328         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
329         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
330
331         switch (hdr->frame_control &
332                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
333         case cpu_to_le16(IEEE80211_FCTL_TODS):
334                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
335                              iftype != NL80211_IFTYPE_AP_VLAN &&
336                              iftype != NL80211_IFTYPE_P2P_GO))
337                         return -1;
338                 break;
339         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
340                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
341                              iftype != NL80211_IFTYPE_MESH_POINT &&
342                              iftype != NL80211_IFTYPE_AP_VLAN &&
343                              iftype != NL80211_IFTYPE_STATION))
344                         return -1;
345                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
346                         struct ieee80211s_hdr *meshdr =
347                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
348                         /* make sure meshdr->flags is on the linear part */
349                         if (!pskb_may_pull(skb, hdrlen + 1))
350                                 return -1;
351                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
352                                 skb_copy_bits(skb, hdrlen +
353                                         offsetof(struct ieee80211s_hdr, eaddr1),
354                                         dst, ETH_ALEN);
355                                 skb_copy_bits(skb, hdrlen +
356                                         offsetof(struct ieee80211s_hdr, eaddr2),
357                                         src, ETH_ALEN);
358                         }
359                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
360                 }
361                 break;
362         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
363                 if ((iftype != NL80211_IFTYPE_STATION &&
364                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
365                      iftype != NL80211_IFTYPE_MESH_POINT) ||
366                     (is_multicast_ether_addr(dst) &&
367                      !compare_ether_addr(src, addr)))
368                         return -1;
369                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
370                         struct ieee80211s_hdr *meshdr =
371                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
372                         /* make sure meshdr->flags is on the linear part */
373                         if (!pskb_may_pull(skb, hdrlen + 1))
374                                 return -1;
375                         if (meshdr->flags & MESH_FLAGS_AE_A4)
376                                 skb_copy_bits(skb, hdrlen +
377                                         offsetof(struct ieee80211s_hdr, eaddr1),
378                                         src, ETH_ALEN);
379                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
380                 }
381                 break;
382         case cpu_to_le16(0):
383                 if (iftype != NL80211_IFTYPE_ADHOC)
384                         return -1;
385                 break;
386         }
387
388         if (!pskb_may_pull(skb, hdrlen + 8))
389                 return -1;
390
391         payload = skb->data + hdrlen;
392         ethertype = (payload[6] << 8) | payload[7];
393
394         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
395                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
396                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
397                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
398                  * replace EtherType */
399                 skb_pull(skb, hdrlen + 6);
400                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
401                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
402         } else {
403                 struct ethhdr *ehdr;
404                 __be16 len;
405
406                 skb_pull(skb, hdrlen);
407                 len = htons(skb->len);
408                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
409                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
410                 memcpy(ehdr->h_source, src, ETH_ALEN);
411                 ehdr->h_proto = len;
412         }
413         return 0;
414 }
415 EXPORT_SYMBOL(ieee80211_data_to_8023);
416
417 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
418                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
419 {
420         struct ieee80211_hdr hdr;
421         u16 hdrlen, ethertype;
422         __le16 fc;
423         const u8 *encaps_data;
424         int encaps_len, skip_header_bytes;
425         int nh_pos, h_pos;
426         int head_need;
427
428         if (unlikely(skb->len < ETH_HLEN))
429                 return -EINVAL;
430
431         nh_pos = skb_network_header(skb) - skb->data;
432         h_pos = skb_transport_header(skb) - skb->data;
433
434         /* convert Ethernet header to proper 802.11 header (based on
435          * operation mode) */
436         ethertype = (skb->data[12] << 8) | skb->data[13];
437         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
438
439         switch (iftype) {
440         case NL80211_IFTYPE_AP:
441         case NL80211_IFTYPE_AP_VLAN:
442         case NL80211_IFTYPE_P2P_GO:
443                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
444                 /* DA BSSID SA */
445                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
446                 memcpy(hdr.addr2, addr, ETH_ALEN);
447                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
448                 hdrlen = 24;
449                 break;
450         case NL80211_IFTYPE_STATION:
451         case NL80211_IFTYPE_P2P_CLIENT:
452                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
453                 /* BSSID SA DA */
454                 memcpy(hdr.addr1, bssid, ETH_ALEN);
455                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
456                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
457                 hdrlen = 24;
458                 break;
459         case NL80211_IFTYPE_ADHOC:
460                 /* DA SA BSSID */
461                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
462                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
463                 memcpy(hdr.addr3, bssid, ETH_ALEN);
464                 hdrlen = 24;
465                 break;
466         default:
467                 return -EOPNOTSUPP;
468         }
469
470         if (qos) {
471                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
472                 hdrlen += 2;
473         }
474
475         hdr.frame_control = fc;
476         hdr.duration_id = 0;
477         hdr.seq_ctrl = 0;
478
479         skip_header_bytes = ETH_HLEN;
480         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
481                 encaps_data = bridge_tunnel_header;
482                 encaps_len = sizeof(bridge_tunnel_header);
483                 skip_header_bytes -= 2;
484         } else if (ethertype > 0x600) {
485                 encaps_data = rfc1042_header;
486                 encaps_len = sizeof(rfc1042_header);
487                 skip_header_bytes -= 2;
488         } else {
489                 encaps_data = NULL;
490                 encaps_len = 0;
491         }
492
493         skb_pull(skb, skip_header_bytes);
494         nh_pos -= skip_header_bytes;
495         h_pos -= skip_header_bytes;
496
497         head_need = hdrlen + encaps_len - skb_headroom(skb);
498
499         if (head_need > 0 || skb_cloned(skb)) {
500                 head_need = max(head_need, 0);
501                 if (head_need)
502                         skb_orphan(skb);
503
504                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
505                         pr_err("failed to reallocate Tx buffer\n");
506                         return -ENOMEM;
507                 }
508                 skb->truesize += head_need;
509         }
510
511         if (encaps_data) {
512                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
513                 nh_pos += encaps_len;
514                 h_pos += encaps_len;
515         }
516
517         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
518
519         nh_pos += hdrlen;
520         h_pos += hdrlen;
521
522         /* Update skb pointers to various headers since this modified frame
523          * is going to go through Linux networking code that may potentially
524          * need things like pointer to IP header. */
525         skb_set_mac_header(skb, 0);
526         skb_set_network_header(skb, nh_pos);
527         skb_set_transport_header(skb, h_pos);
528
529         return 0;
530 }
531 EXPORT_SYMBOL(ieee80211_data_from_8023);
532
533
534 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
535                               const u8 *addr, enum nl80211_iftype iftype,
536                               const unsigned int extra_headroom)
537 {
538         struct sk_buff *frame = NULL;
539         u16 ethertype;
540         u8 *payload;
541         const struct ethhdr *eth;
542         int remaining, err;
543         u8 dst[ETH_ALEN], src[ETH_ALEN];
544
545         err = ieee80211_data_to_8023(skb, addr, iftype);
546         if (err)
547                 goto out;
548
549         /* skip the wrapping header */
550         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
551         if (!eth)
552                 goto out;
553
554         while (skb != frame) {
555                 u8 padding;
556                 __be16 len = eth->h_proto;
557                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
558
559                 remaining = skb->len;
560                 memcpy(dst, eth->h_dest, ETH_ALEN);
561                 memcpy(src, eth->h_source, ETH_ALEN);
562
563                 padding = (4 - subframe_len) & 0x3;
564                 /* the last MSDU has no padding */
565                 if (subframe_len > remaining)
566                         goto purge;
567
568                 skb_pull(skb, sizeof(struct ethhdr));
569                 /* reuse skb for the last subframe */
570                 if (remaining <= subframe_len + padding)
571                         frame = skb;
572                 else {
573                         unsigned int hlen = ALIGN(extra_headroom, 4);
574                         /*
575                          * Allocate and reserve two bytes more for payload
576                          * alignment since sizeof(struct ethhdr) is 14.
577                          */
578                         frame = dev_alloc_skb(hlen + subframe_len + 2);
579                         if (!frame)
580                                 goto purge;
581
582                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
583                         memcpy(skb_put(frame, ntohs(len)), skb->data,
584                                 ntohs(len));
585
586                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
587                                                         padding);
588                         if (!eth) {
589                                 dev_kfree_skb(frame);
590                                 goto purge;
591                         }
592                 }
593
594                 skb_reset_network_header(frame);
595                 frame->dev = skb->dev;
596                 frame->priority = skb->priority;
597
598                 payload = frame->data;
599                 ethertype = (payload[6] << 8) | payload[7];
600
601                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
602                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
603                            compare_ether_addr(payload,
604                                               bridge_tunnel_header) == 0)) {
605                         /* remove RFC1042 or Bridge-Tunnel
606                          * encapsulation and replace EtherType */
607                         skb_pull(frame, 6);
608                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
609                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
610                 } else {
611                         memcpy(skb_push(frame, sizeof(__be16)), &len,
612                                 sizeof(__be16));
613                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
614                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
615                 }
616                 __skb_queue_tail(list, frame);
617         }
618
619         return;
620
621  purge:
622         __skb_queue_purge(list);
623  out:
624         dev_kfree_skb(skb);
625 }
626 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
627
628 /* Given a data frame determine the 802.1p/1d tag to use. */
629 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
630 {
631         unsigned int dscp;
632
633         /* skb->priority values from 256->263 are magic values to
634          * directly indicate a specific 802.1d priority.  This is used
635          * to allow 802.1d priority to be passed directly in from VLAN
636          * tags, etc.
637          */
638         if (skb->priority >= 256 && skb->priority <= 263)
639                 return skb->priority - 256;
640
641         switch (skb->protocol) {
642         case htons(ETH_P_IP):
643                 dscp = ip_hdr(skb)->tos & 0xfc;
644                 break;
645         default:
646                 return 0;
647         }
648
649         return dscp >> 5;
650 }
651 EXPORT_SYMBOL(cfg80211_classify8021d);
652
653 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
654 {
655         u8 *end, *pos;
656
657         pos = bss->information_elements;
658         if (pos == NULL)
659                 return NULL;
660         end = pos + bss->len_information_elements;
661
662         while (pos + 1 < end) {
663                 if (pos + 2 + pos[1] > end)
664                         break;
665                 if (pos[0] == ie)
666                         return pos;
667                 pos += 2 + pos[1];
668         }
669
670         return NULL;
671 }
672 EXPORT_SYMBOL(ieee80211_bss_get_ie);
673
674 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
675 {
676         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
677         struct net_device *dev = wdev->netdev;
678         int i;
679
680         if (!wdev->connect_keys)
681                 return;
682
683         for (i = 0; i < 6; i++) {
684                 if (!wdev->connect_keys->params[i].cipher)
685                         continue;
686                 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
687                                         &wdev->connect_keys->params[i])) {
688                         netdev_err(dev, "failed to set key %d\n", i);
689                         continue;
690                 }
691                 if (wdev->connect_keys->def == i)
692                         if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
693                                 netdev_err(dev, "failed to set defkey %d\n", i);
694                                 continue;
695                         }
696                 if (wdev->connect_keys->defmgmt == i)
697                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
698                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
699         }
700
701         kfree(wdev->connect_keys);
702         wdev->connect_keys = NULL;
703 }
704
705 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
706 {
707         struct cfg80211_event *ev;
708         unsigned long flags;
709         const u8 *bssid = NULL;
710
711         spin_lock_irqsave(&wdev->event_lock, flags);
712         while (!list_empty(&wdev->event_list)) {
713                 ev = list_first_entry(&wdev->event_list,
714                                       struct cfg80211_event, list);
715                 list_del(&ev->list);
716                 spin_unlock_irqrestore(&wdev->event_lock, flags);
717
718                 wdev_lock(wdev);
719                 switch (ev->type) {
720                 case EVENT_CONNECT_RESULT:
721                         if (!is_zero_ether_addr(ev->cr.bssid))
722                                 bssid = ev->cr.bssid;
723                         __cfg80211_connect_result(
724                                 wdev->netdev, bssid,
725                                 ev->cr.req_ie, ev->cr.req_ie_len,
726                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
727                                 ev->cr.status,
728                                 ev->cr.status == WLAN_STATUS_SUCCESS,
729                                 NULL);
730                         break;
731                 case EVENT_ROAMED:
732                         __cfg80211_roamed(wdev, ev->rm.bssid,
733                                           ev->rm.req_ie, ev->rm.req_ie_len,
734                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
735                         break;
736                 case EVENT_DISCONNECTED:
737                         __cfg80211_disconnected(wdev->netdev,
738                                                 ev->dc.ie, ev->dc.ie_len,
739                                                 ev->dc.reason, true);
740                         break;
741                 case EVENT_IBSS_JOINED:
742                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
743                         break;
744                 }
745                 wdev_unlock(wdev);
746
747                 kfree(ev);
748
749                 spin_lock_irqsave(&wdev->event_lock, flags);
750         }
751         spin_unlock_irqrestore(&wdev->event_lock, flags);
752 }
753
754 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
755 {
756         struct wireless_dev *wdev;
757
758         ASSERT_RTNL();
759         ASSERT_RDEV_LOCK(rdev);
760
761         mutex_lock(&rdev->devlist_mtx);
762
763         list_for_each_entry(wdev, &rdev->netdev_list, list)
764                 cfg80211_process_wdev_events(wdev);
765
766         mutex_unlock(&rdev->devlist_mtx);
767 }
768
769 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
770                           struct net_device *dev, enum nl80211_iftype ntype,
771                           u32 *flags, struct vif_params *params)
772 {
773         int err;
774         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
775
776         ASSERT_RDEV_LOCK(rdev);
777
778         /* don't support changing VLANs, you just re-create them */
779         if (otype == NL80211_IFTYPE_AP_VLAN)
780                 return -EOPNOTSUPP;
781
782         if (!rdev->ops->change_virtual_intf ||
783             !(rdev->wiphy.interface_modes & (1 << ntype)))
784                 return -EOPNOTSUPP;
785
786         /* if it's part of a bridge, reject changing type to station/ibss */
787         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
788             (ntype == NL80211_IFTYPE_ADHOC ||
789              ntype == NL80211_IFTYPE_STATION ||
790              ntype == NL80211_IFTYPE_P2P_CLIENT))
791                 return -EBUSY;
792
793         if (ntype != otype) {
794                 dev->ieee80211_ptr->use_4addr = false;
795
796                 switch (otype) {
797                 case NL80211_IFTYPE_ADHOC:
798                         cfg80211_leave_ibss(rdev, dev, false);
799                         break;
800                 case NL80211_IFTYPE_STATION:
801                 case NL80211_IFTYPE_P2P_CLIENT:
802                         cfg80211_disconnect(rdev, dev,
803                                             WLAN_REASON_DEAUTH_LEAVING, true);
804                         break;
805                 case NL80211_IFTYPE_MESH_POINT:
806                         /* mesh should be handled? */
807                         break;
808                 default:
809                         break;
810                 }
811
812                 cfg80211_process_rdev_events(rdev);
813         }
814
815         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
816                                              ntype, flags, params);
817
818         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
819
820         if (!err && params && params->use_4addr != -1)
821                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
822
823         if (!err) {
824                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
825                 switch (ntype) {
826                 case NL80211_IFTYPE_STATION:
827                         if (dev->ieee80211_ptr->use_4addr)
828                                 break;
829                         /* fall through */
830                 case NL80211_IFTYPE_P2P_CLIENT:
831                 case NL80211_IFTYPE_ADHOC:
832                         dev->priv_flags |= IFF_DONT_BRIDGE;
833                         break;
834                 case NL80211_IFTYPE_P2P_GO:
835                 case NL80211_IFTYPE_AP:
836                 case NL80211_IFTYPE_AP_VLAN:
837                 case NL80211_IFTYPE_WDS:
838                 case NL80211_IFTYPE_MESH_POINT:
839                         /* bridging OK */
840                         break;
841                 case NL80211_IFTYPE_MONITOR:
842                         /* monitor can't bridge anyway */
843                         break;
844                 case NL80211_IFTYPE_UNSPECIFIED:
845                 case NUM_NL80211_IFTYPES:
846                         /* not happening */
847                         break;
848                 }
849         }
850
851         return err;
852 }
853
854 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
855 {
856         int modulation, streams, bitrate;
857
858         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
859                 return rate->legacy;
860
861         /* the formula below does only work for MCS values smaller than 32 */
862         if (rate->mcs >= 32)
863                 return 0;
864
865         modulation = rate->mcs & 7;
866         streams = (rate->mcs >> 3) + 1;
867
868         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
869                         13500000 : 6500000;
870
871         if (modulation < 4)
872                 bitrate *= (modulation + 1);
873         else if (modulation == 4)
874                 bitrate *= (modulation + 2);
875         else
876                 bitrate *= (modulation + 3);
877
878         bitrate *= streams;
879
880         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
881                 bitrate = (bitrate / 9) * 10;
882
883         /* do NOT round down here */
884         return (bitrate + 50000) / 100000;
885 }