1eb24162be61dbd5f762941d45543d73181261ac
[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                                    const u8 *mac_addr)
148 {
149         int i;
150
151         if (key_idx > 5)
152                 return -EINVAL;
153
154         /*
155          * Disallow pairwise keys with non-zero index unless it's WEP
156          * (because current deployments use pairwise WEP keys with
157          * non-zero indizes but 802.11i clearly specifies to use zero)
158          */
159         if (mac_addr && key_idx &&
160             params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
161             params->cipher != WLAN_CIPHER_SUITE_WEP104)
162                 return -EINVAL;
163
164         switch (params->cipher) {
165         case WLAN_CIPHER_SUITE_WEP40:
166                 if (params->key_len != WLAN_KEY_LEN_WEP40)
167                         return -EINVAL;
168                 break;
169         case WLAN_CIPHER_SUITE_TKIP:
170                 if (params->key_len != WLAN_KEY_LEN_TKIP)
171                         return -EINVAL;
172                 break;
173         case WLAN_CIPHER_SUITE_CCMP:
174                 if (params->key_len != WLAN_KEY_LEN_CCMP)
175                         return -EINVAL;
176                 break;
177         case WLAN_CIPHER_SUITE_WEP104:
178                 if (params->key_len != WLAN_KEY_LEN_WEP104)
179                         return -EINVAL;
180                 break;
181         case WLAN_CIPHER_SUITE_AES_CMAC:
182                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
183                         return -EINVAL;
184                 break;
185         default:
186                 return -EINVAL;
187         }
188
189         if (params->seq) {
190                 switch (params->cipher) {
191                 case WLAN_CIPHER_SUITE_WEP40:
192                 case WLAN_CIPHER_SUITE_WEP104:
193                         /* These ciphers do not use key sequence */
194                         return -EINVAL;
195                 case WLAN_CIPHER_SUITE_TKIP:
196                 case WLAN_CIPHER_SUITE_CCMP:
197                 case WLAN_CIPHER_SUITE_AES_CMAC:
198                         if (params->seq_len != 6)
199                                 return -EINVAL;
200                         break;
201                 }
202         }
203
204         for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
205                 if (params->cipher == rdev->wiphy.cipher_suites[i])
206                         break;
207         if (i == rdev->wiphy.n_cipher_suites)
208                 return -EINVAL;
209
210         return 0;
211 }
212
213 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
214 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
215 const unsigned char rfc1042_header[] __aligned(2) =
216         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
217 EXPORT_SYMBOL(rfc1042_header);
218
219 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
220 const unsigned char bridge_tunnel_header[] __aligned(2) =
221         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
222 EXPORT_SYMBOL(bridge_tunnel_header);
223
224 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
225 {
226         unsigned int hdrlen = 24;
227
228         if (ieee80211_is_data(fc)) {
229                 if (ieee80211_has_a4(fc))
230                         hdrlen = 30;
231                 if (ieee80211_is_data_qos(fc)) {
232                         hdrlen += IEEE80211_QOS_CTL_LEN;
233                         if (ieee80211_has_order(fc))
234                                 hdrlen += IEEE80211_HT_CTL_LEN;
235                 }
236                 goto out;
237         }
238
239         if (ieee80211_is_ctl(fc)) {
240                 /*
241                  * ACK and CTS are 10 bytes, all others 16. To see how
242                  * to get this condition consider
243                  *   subtype mask:   0b0000000011110000 (0x00F0)
244                  *   ACK subtype:    0b0000000011010000 (0x00D0)
245                  *   CTS subtype:    0b0000000011000000 (0x00C0)
246                  *   bits that matter:         ^^^      (0x00E0)
247                  *   value of those: 0b0000000011000000 (0x00C0)
248                  */
249                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
250                         hdrlen = 10;
251                 else
252                         hdrlen = 16;
253         }
254 out:
255         return hdrlen;
256 }
257 EXPORT_SYMBOL(ieee80211_hdrlen);
258
259 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
260 {
261         const struct ieee80211_hdr *hdr =
262                         (const struct ieee80211_hdr *)skb->data;
263         unsigned int hdrlen;
264
265         if (unlikely(skb->len < 10))
266                 return 0;
267         hdrlen = ieee80211_hdrlen(hdr->frame_control);
268         if (unlikely(hdrlen > skb->len))
269                 return 0;
270         return hdrlen;
271 }
272 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
273
274 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
275 {
276         int ae = meshhdr->flags & MESH_FLAGS_AE;
277         /* 7.1.3.5a.2 */
278         switch (ae) {
279         case 0:
280                 return 6;
281         case MESH_FLAGS_AE_A4:
282                 return 12;
283         case MESH_FLAGS_AE_A5_A6:
284                 return 18;
285         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
286                 return 24;
287         default:
288                 return 6;
289         }
290 }
291
292 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
293                            enum nl80211_iftype iftype)
294 {
295         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
296         u16 hdrlen, ethertype;
297         u8 *payload;
298         u8 dst[ETH_ALEN];
299         u8 src[ETH_ALEN] __aligned(2);
300
301         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
302                 return -1;
303
304         hdrlen = ieee80211_hdrlen(hdr->frame_control);
305
306         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
307          * header
308          * IEEE 802.11 address fields:
309          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
310          *   0     0   DA    SA    BSSID n/a
311          *   0     1   DA    BSSID SA    n/a
312          *   1     0   BSSID SA    DA    n/a
313          *   1     1   RA    TA    DA    SA
314          */
315         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
316         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
317
318         switch (hdr->frame_control &
319                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
320         case cpu_to_le16(IEEE80211_FCTL_TODS):
321                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
322                              iftype != NL80211_IFTYPE_AP_VLAN))
323                         return -1;
324                 break;
325         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
326                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
327                              iftype != NL80211_IFTYPE_MESH_POINT &&
328                              iftype != NL80211_IFTYPE_AP_VLAN &&
329                              iftype != NL80211_IFTYPE_STATION))
330                         return -1;
331                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
332                         struct ieee80211s_hdr *meshdr =
333                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
334                         /* make sure meshdr->flags is on the linear part */
335                         if (!pskb_may_pull(skb, hdrlen + 1))
336                                 return -1;
337                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
338                                 skb_copy_bits(skb, hdrlen +
339                                         offsetof(struct ieee80211s_hdr, eaddr1),
340                                         dst, ETH_ALEN);
341                                 skb_copy_bits(skb, hdrlen +
342                                         offsetof(struct ieee80211s_hdr, eaddr2),
343                                         src, ETH_ALEN);
344                         }
345                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
346                 }
347                 break;
348         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
349                 if ((iftype != NL80211_IFTYPE_STATION &&
350                     iftype != NL80211_IFTYPE_MESH_POINT) ||
351                     (is_multicast_ether_addr(dst) &&
352                      !compare_ether_addr(src, addr)))
353                         return -1;
354                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
355                         struct ieee80211s_hdr *meshdr =
356                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
357                         /* make sure meshdr->flags is on the linear part */
358                         if (!pskb_may_pull(skb, hdrlen + 1))
359                                 return -1;
360                         if (meshdr->flags & MESH_FLAGS_AE_A4)
361                                 skb_copy_bits(skb, hdrlen +
362                                         offsetof(struct ieee80211s_hdr, eaddr1),
363                                         src, ETH_ALEN);
364                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
365                 }
366                 break;
367         case cpu_to_le16(0):
368                 if (iftype != NL80211_IFTYPE_ADHOC)
369                         return -1;
370                 break;
371         }
372
373         if (!pskb_may_pull(skb, hdrlen + 8))
374                 return -1;
375
376         payload = skb->data + hdrlen;
377         ethertype = (payload[6] << 8) | payload[7];
378
379         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
380                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
381                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
382                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
383                  * replace EtherType */
384                 skb_pull(skb, hdrlen + 6);
385                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
386                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
387         } else {
388                 struct ethhdr *ehdr;
389                 __be16 len;
390
391                 skb_pull(skb, hdrlen);
392                 len = htons(skb->len);
393                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
394                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
395                 memcpy(ehdr->h_source, src, ETH_ALEN);
396                 ehdr->h_proto = len;
397         }
398         return 0;
399 }
400 EXPORT_SYMBOL(ieee80211_data_to_8023);
401
402 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
403                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
404 {
405         struct ieee80211_hdr hdr;
406         u16 hdrlen, ethertype;
407         __le16 fc;
408         const u8 *encaps_data;
409         int encaps_len, skip_header_bytes;
410         int nh_pos, h_pos;
411         int head_need;
412
413         if (unlikely(skb->len < ETH_HLEN))
414                 return -EINVAL;
415
416         nh_pos = skb_network_header(skb) - skb->data;
417         h_pos = skb_transport_header(skb) - skb->data;
418
419         /* convert Ethernet header to proper 802.11 header (based on
420          * operation mode) */
421         ethertype = (skb->data[12] << 8) | skb->data[13];
422         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
423
424         switch (iftype) {
425         case NL80211_IFTYPE_AP:
426         case NL80211_IFTYPE_AP_VLAN:
427                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
428                 /* DA BSSID SA */
429                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
430                 memcpy(hdr.addr2, addr, ETH_ALEN);
431                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
432                 hdrlen = 24;
433                 break;
434         case NL80211_IFTYPE_STATION:
435                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
436                 /* BSSID SA DA */
437                 memcpy(hdr.addr1, bssid, ETH_ALEN);
438                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
439                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
440                 hdrlen = 24;
441                 break;
442         case NL80211_IFTYPE_ADHOC:
443                 /* DA SA BSSID */
444                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
445                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
446                 memcpy(hdr.addr3, bssid, ETH_ALEN);
447                 hdrlen = 24;
448                 break;
449         default:
450                 return -EOPNOTSUPP;
451         }
452
453         if (qos) {
454                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
455                 hdrlen += 2;
456         }
457
458         hdr.frame_control = fc;
459         hdr.duration_id = 0;
460         hdr.seq_ctrl = 0;
461
462         skip_header_bytes = ETH_HLEN;
463         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
464                 encaps_data = bridge_tunnel_header;
465                 encaps_len = sizeof(bridge_tunnel_header);
466                 skip_header_bytes -= 2;
467         } else if (ethertype > 0x600) {
468                 encaps_data = rfc1042_header;
469                 encaps_len = sizeof(rfc1042_header);
470                 skip_header_bytes -= 2;
471         } else {
472                 encaps_data = NULL;
473                 encaps_len = 0;
474         }
475
476         skb_pull(skb, skip_header_bytes);
477         nh_pos -= skip_header_bytes;
478         h_pos -= skip_header_bytes;
479
480         head_need = hdrlen + encaps_len - skb_headroom(skb);
481
482         if (head_need > 0 || skb_cloned(skb)) {
483                 head_need = max(head_need, 0);
484                 if (head_need)
485                         skb_orphan(skb);
486
487                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
488                         printk(KERN_ERR "failed to reallocate Tx buffer\n");
489                         return -ENOMEM;
490                 }
491                 skb->truesize += head_need;
492         }
493
494         if (encaps_data) {
495                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
496                 nh_pos += encaps_len;
497                 h_pos += encaps_len;
498         }
499
500         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
501
502         nh_pos += hdrlen;
503         h_pos += hdrlen;
504
505         /* Update skb pointers to various headers since this modified frame
506          * is going to go through Linux networking code that may potentially
507          * need things like pointer to IP header. */
508         skb_set_mac_header(skb, 0);
509         skb_set_network_header(skb, nh_pos);
510         skb_set_transport_header(skb, h_pos);
511
512         return 0;
513 }
514 EXPORT_SYMBOL(ieee80211_data_from_8023);
515
516
517 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
518                               const u8 *addr, enum nl80211_iftype iftype,
519                               const unsigned int extra_headroom)
520 {
521         struct sk_buff *frame = NULL;
522         u16 ethertype;
523         u8 *payload;
524         const struct ethhdr *eth;
525         int remaining, err;
526         u8 dst[ETH_ALEN], src[ETH_ALEN];
527
528         err = ieee80211_data_to_8023(skb, addr, iftype);
529         if (err)
530                 goto out;
531
532         /* skip the wrapping header */
533         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
534         if (!eth)
535                 goto out;
536
537         while (skb != frame) {
538                 u8 padding;
539                 __be16 len = eth->h_proto;
540                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
541
542                 remaining = skb->len;
543                 memcpy(dst, eth->h_dest, ETH_ALEN);
544                 memcpy(src, eth->h_source, ETH_ALEN);
545
546                 padding = (4 - subframe_len) & 0x3;
547                 /* the last MSDU has no padding */
548                 if (subframe_len > remaining)
549                         goto purge;
550
551                 skb_pull(skb, sizeof(struct ethhdr));
552                 /* reuse skb for the last subframe */
553                 if (remaining <= subframe_len + padding)
554                         frame = skb;
555                 else {
556                         unsigned int hlen = ALIGN(extra_headroom, 4);
557                         /*
558                          * Allocate and reserve two bytes more for payload
559                          * alignment since sizeof(struct ethhdr) is 14.
560                          */
561                         frame = dev_alloc_skb(hlen + subframe_len + 2);
562                         if (!frame)
563                                 goto purge;
564
565                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
566                         memcpy(skb_put(frame, ntohs(len)), skb->data,
567                                 ntohs(len));
568
569                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
570                                                         padding);
571                         if (!eth) {
572                                 dev_kfree_skb(frame);
573                                 goto purge;
574                         }
575                 }
576
577                 skb_reset_network_header(frame);
578                 frame->dev = skb->dev;
579                 frame->priority = skb->priority;
580
581                 payload = frame->data;
582                 ethertype = (payload[6] << 8) | payload[7];
583
584                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
585                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
586                            compare_ether_addr(payload,
587                                               bridge_tunnel_header) == 0)) {
588                         /* remove RFC1042 or Bridge-Tunnel
589                          * encapsulation and replace EtherType */
590                         skb_pull(frame, 6);
591                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
592                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
593                 } else {
594                         memcpy(skb_push(frame, sizeof(__be16)), &len,
595                                 sizeof(__be16));
596                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
597                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
598                 }
599                 __skb_queue_tail(list, frame);
600         }
601
602         return;
603
604  purge:
605         __skb_queue_purge(list);
606  out:
607         dev_kfree_skb(skb);
608 }
609 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
610
611 /* Given a data frame determine the 802.1p/1d tag to use. */
612 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
613 {
614         unsigned int dscp;
615
616         /* skb->priority values from 256->263 are magic values to
617          * directly indicate a specific 802.1d priority.  This is used
618          * to allow 802.1d priority to be passed directly in from VLAN
619          * tags, etc.
620          */
621         if (skb->priority >= 256 && skb->priority <= 263)
622                 return skb->priority - 256;
623
624         switch (skb->protocol) {
625         case htons(ETH_P_IP):
626                 dscp = ip_hdr(skb)->tos & 0xfc;
627                 break;
628         default:
629                 return 0;
630         }
631
632         return dscp >> 5;
633 }
634 EXPORT_SYMBOL(cfg80211_classify8021d);
635
636 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
637 {
638         u8 *end, *pos;
639
640         pos = bss->information_elements;
641         if (pos == NULL)
642                 return NULL;
643         end = pos + bss->len_information_elements;
644
645         while (pos + 1 < end) {
646                 if (pos + 2 + pos[1] > end)
647                         break;
648                 if (pos[0] == ie)
649                         return pos;
650                 pos += 2 + pos[1];
651         }
652
653         return NULL;
654 }
655 EXPORT_SYMBOL(ieee80211_bss_get_ie);
656
657 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
658 {
659         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
660         struct net_device *dev = wdev->netdev;
661         int i;
662
663         if (!wdev->connect_keys)
664                 return;
665
666         for (i = 0; i < 6; i++) {
667                 if (!wdev->connect_keys->params[i].cipher)
668                         continue;
669                 if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
670                                         &wdev->connect_keys->params[i])) {
671                         printk(KERN_ERR "%s: failed to set key %d\n",
672                                 dev->name, i);
673                         continue;
674                 }
675                 if (wdev->connect_keys->def == i)
676                         if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
677                                 printk(KERN_ERR "%s: failed to set defkey %d\n",
678                                         dev->name, i);
679                                 continue;
680                         }
681                 if (wdev->connect_keys->defmgmt == i)
682                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
683                                 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
684                                         dev->name, i);
685         }
686
687         kfree(wdev->connect_keys);
688         wdev->connect_keys = NULL;
689 }
690
691 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
692 {
693         struct cfg80211_event *ev;
694         unsigned long flags;
695         const u8 *bssid = NULL;
696
697         spin_lock_irqsave(&wdev->event_lock, flags);
698         while (!list_empty(&wdev->event_list)) {
699                 ev = list_first_entry(&wdev->event_list,
700                                       struct cfg80211_event, list);
701                 list_del(&ev->list);
702                 spin_unlock_irqrestore(&wdev->event_lock, flags);
703
704                 wdev_lock(wdev);
705                 switch (ev->type) {
706                 case EVENT_CONNECT_RESULT:
707                         if (!is_zero_ether_addr(ev->cr.bssid))
708                                 bssid = ev->cr.bssid;
709                         __cfg80211_connect_result(
710                                 wdev->netdev, bssid,
711                                 ev->cr.req_ie, ev->cr.req_ie_len,
712                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
713                                 ev->cr.status,
714                                 ev->cr.status == WLAN_STATUS_SUCCESS,
715                                 NULL);
716                         break;
717                 case EVENT_ROAMED:
718                         __cfg80211_roamed(wdev, ev->rm.bssid,
719                                           ev->rm.req_ie, ev->rm.req_ie_len,
720                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
721                         break;
722                 case EVENT_DISCONNECTED:
723                         __cfg80211_disconnected(wdev->netdev,
724                                                 ev->dc.ie, ev->dc.ie_len,
725                                                 ev->dc.reason, true);
726                         break;
727                 case EVENT_IBSS_JOINED:
728                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
729                         break;
730                 }
731                 wdev_unlock(wdev);
732
733                 kfree(ev);
734
735                 spin_lock_irqsave(&wdev->event_lock, flags);
736         }
737         spin_unlock_irqrestore(&wdev->event_lock, flags);
738 }
739
740 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
741 {
742         struct wireless_dev *wdev;
743
744         ASSERT_RTNL();
745         ASSERT_RDEV_LOCK(rdev);
746
747         mutex_lock(&rdev->devlist_mtx);
748
749         list_for_each_entry(wdev, &rdev->netdev_list, list)
750                 cfg80211_process_wdev_events(wdev);
751
752         mutex_unlock(&rdev->devlist_mtx);
753 }
754
755 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
756                           struct net_device *dev, enum nl80211_iftype ntype,
757                           u32 *flags, struct vif_params *params)
758 {
759         int err;
760         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
761
762         ASSERT_RDEV_LOCK(rdev);
763
764         /* don't support changing VLANs, you just re-create them */
765         if (otype == NL80211_IFTYPE_AP_VLAN)
766                 return -EOPNOTSUPP;
767
768         if (!rdev->ops->change_virtual_intf ||
769             !(rdev->wiphy.interface_modes & (1 << ntype)))
770                 return -EOPNOTSUPP;
771
772         /* if it's part of a bridge, reject changing type to station/ibss */
773         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
774             (ntype == NL80211_IFTYPE_ADHOC || ntype == NL80211_IFTYPE_STATION))
775                 return -EBUSY;
776
777         if (ntype != otype) {
778                 dev->ieee80211_ptr->use_4addr = false;
779
780                 switch (otype) {
781                 case NL80211_IFTYPE_ADHOC:
782                         cfg80211_leave_ibss(rdev, dev, false);
783                         break;
784                 case NL80211_IFTYPE_STATION:
785                         cfg80211_disconnect(rdev, dev,
786                                             WLAN_REASON_DEAUTH_LEAVING, true);
787                         break;
788                 case NL80211_IFTYPE_MESH_POINT:
789                         /* mesh should be handled? */
790                         break;
791                 default:
792                         break;
793                 }
794
795                 cfg80211_process_rdev_events(rdev);
796         }
797
798         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
799                                              ntype, flags, params);
800
801         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
802
803         if (!err && params && params->use_4addr != -1)
804                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
805
806         if (!err) {
807                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
808                 switch (ntype) {
809                 case NL80211_IFTYPE_STATION:
810                         if (dev->ieee80211_ptr->use_4addr)
811                                 break;
812                         /* fall through */
813                 case NL80211_IFTYPE_ADHOC:
814                         dev->priv_flags |= IFF_DONT_BRIDGE;
815                         break;
816                 case NL80211_IFTYPE_AP:
817                 case NL80211_IFTYPE_AP_VLAN:
818                 case NL80211_IFTYPE_WDS:
819                 case NL80211_IFTYPE_MESH_POINT:
820                         /* bridging OK */
821                         break;
822                 case NL80211_IFTYPE_MONITOR:
823                         /* monitor can't bridge anyway */
824                         break;
825                 case NL80211_IFTYPE_UNSPECIFIED:
826                 case __NL80211_IFTYPE_AFTER_LAST:
827                         /* not happening */
828                         break;
829                 }
830         }
831
832         return err;
833 }
834
835 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
836 {
837         int modulation, streams, bitrate;
838
839         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
840                 return rate->legacy;
841
842         /* the formula below does only work for MCS values smaller than 32 */
843         if (rate->mcs >= 32)
844                 return 0;
845
846         modulation = rate->mcs & 7;
847         streams = (rate->mcs >> 3) + 1;
848
849         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
850                         13500000 : 6500000;
851
852         if (modulation < 4)
853                 bitrate *= (modulation + 1);
854         else if (modulation == 4)
855                 bitrate *= (modulation + 2);
856         else
857                 bitrate *= (modulation + 3);
858
859         bitrate *= streams;
860
861         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
862                 bitrate = (bitrate / 9) * 10;
863
864         /* do NOT round down here */
865         return (bitrate + 50000) / 100000;
866 }