ipv4: flush route cache after change accept_local
[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, enum ieee80211_band band)
33 {
34         /* see 802.11 17.3.8.3.2 and Annex J
35          * there are overlapping channel numbers in 5GHz and 2GHz bands */
36         if (band == IEEE80211_BAND_5GHZ) {
37                 if (chan >= 182 && chan <= 196)
38                         return 4000 + chan * 5;
39                 else
40                         return 5000 + chan * 5;
41         } else { /* IEEE80211_BAND_2GHZ */
42                 if (chan == 14)
43                         return 2484;
44                 else if (chan < 14)
45                         return 2407 + chan * 5;
46                 else
47                         return 0; /* not supported */
48         }
49 }
50 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
51
52 int ieee80211_frequency_to_channel(int freq)
53 {
54         /* see 802.11 17.3.8.3.2 and Annex J */
55         if (freq == 2484)
56                 return 14;
57         else if (freq < 2484)
58                 return (freq - 2407) / 5;
59         else if (freq >= 4910 && freq <= 4980)
60                 return (freq - 4000) / 5;
61         else
62                 return (freq - 5000) / 5;
63 }
64 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
65
66 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
67                                                   int freq)
68 {
69         enum ieee80211_band band;
70         struct ieee80211_supported_band *sband;
71         int i;
72
73         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
74                 sband = wiphy->bands[band];
75
76                 if (!sband)
77                         continue;
78
79                 for (i = 0; i < sband->n_channels; i++) {
80                         if (sband->channels[i].center_freq == freq)
81                                 return &sband->channels[i];
82                 }
83         }
84
85         return NULL;
86 }
87 EXPORT_SYMBOL(__ieee80211_get_channel);
88
89 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
90                                      enum ieee80211_band band)
91 {
92         int i, want;
93
94         switch (band) {
95         case IEEE80211_BAND_5GHZ:
96                 want = 3;
97                 for (i = 0; i < sband->n_bitrates; i++) {
98                         if (sband->bitrates[i].bitrate == 60 ||
99                             sband->bitrates[i].bitrate == 120 ||
100                             sband->bitrates[i].bitrate == 240) {
101                                 sband->bitrates[i].flags |=
102                                         IEEE80211_RATE_MANDATORY_A;
103                                 want--;
104                         }
105                 }
106                 WARN_ON(want);
107                 break;
108         case IEEE80211_BAND_2GHZ:
109                 want = 7;
110                 for (i = 0; i < sband->n_bitrates; i++) {
111                         if (sband->bitrates[i].bitrate == 10) {
112                                 sband->bitrates[i].flags |=
113                                         IEEE80211_RATE_MANDATORY_B |
114                                         IEEE80211_RATE_MANDATORY_G;
115                                 want--;
116                         }
117
118                         if (sband->bitrates[i].bitrate == 20 ||
119                             sband->bitrates[i].bitrate == 55 ||
120                             sband->bitrates[i].bitrate == 110 ||
121                             sband->bitrates[i].bitrate == 60 ||
122                             sband->bitrates[i].bitrate == 120 ||
123                             sband->bitrates[i].bitrate == 240) {
124                                 sband->bitrates[i].flags |=
125                                         IEEE80211_RATE_MANDATORY_G;
126                                 want--;
127                         }
128
129                         if (sband->bitrates[i].bitrate != 10 &&
130                             sband->bitrates[i].bitrate != 20 &&
131                             sband->bitrates[i].bitrate != 55 &&
132                             sband->bitrates[i].bitrate != 110)
133                                 sband->bitrates[i].flags |=
134                                         IEEE80211_RATE_ERP_G;
135                 }
136                 WARN_ON(want != 0 && want != 3 && want != 6);
137                 break;
138         case IEEE80211_NUM_BANDS:
139                 WARN_ON(1);
140                 break;
141         }
142 }
143
144 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
145 {
146         enum ieee80211_band band;
147
148         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
149                 if (wiphy->bands[band])
150                         set_mandatory_flags_band(wiphy->bands[band], band);
151 }
152
153 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
154                                    struct key_params *params, int key_idx,
155                                    bool pairwise, const u8 *mac_addr)
156 {
157         int i;
158
159         if (key_idx > 5)
160                 return -EINVAL;
161
162         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
163                 return -EINVAL;
164
165         if (pairwise && !mac_addr)
166                 return -EINVAL;
167
168         /*
169          * Disallow pairwise keys with non-zero index unless it's WEP
170          * or a vendor specific cipher (because current deployments use
171          * pairwise WEP keys with non-zero indices and for vendor specific
172          * ciphers this should be validated in the driver or hardware level
173          * - but 802.11i clearly specifies to use zero)
174          */
175         if (pairwise && key_idx &&
176             ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
177              (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
178              (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
179                 return -EINVAL;
180
181         switch (params->cipher) {
182         case WLAN_CIPHER_SUITE_WEP40:
183                 if (params->key_len != WLAN_KEY_LEN_WEP40)
184                         return -EINVAL;
185                 break;
186         case WLAN_CIPHER_SUITE_TKIP:
187                 if (params->key_len != WLAN_KEY_LEN_TKIP)
188                         return -EINVAL;
189                 break;
190         case WLAN_CIPHER_SUITE_CCMP:
191                 if (params->key_len != WLAN_KEY_LEN_CCMP)
192                         return -EINVAL;
193                 break;
194         case WLAN_CIPHER_SUITE_WEP104:
195                 if (params->key_len != WLAN_KEY_LEN_WEP104)
196                         return -EINVAL;
197                 break;
198         case WLAN_CIPHER_SUITE_AES_CMAC:
199                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
200                         return -EINVAL;
201                 break;
202         default:
203                 /*
204                  * We don't know anything about this algorithm,
205                  * allow using it -- but the driver must check
206                  * all parameters! We still check below whether
207                  * or not the driver supports this algorithm,
208                  * of course.
209                  */
210                 break;
211         }
212
213         if (params->seq) {
214                 switch (params->cipher) {
215                 case WLAN_CIPHER_SUITE_WEP40:
216                 case WLAN_CIPHER_SUITE_WEP104:
217                         /* These ciphers do not use key sequence */
218                         return -EINVAL;
219                 case WLAN_CIPHER_SUITE_TKIP:
220                 case WLAN_CIPHER_SUITE_CCMP:
221                 case WLAN_CIPHER_SUITE_AES_CMAC:
222                         if (params->seq_len != 6)
223                                 return -EINVAL;
224                         break;
225                 }
226         }
227
228         for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
229                 if (params->cipher == rdev->wiphy.cipher_suites[i])
230                         break;
231         if (i == rdev->wiphy.n_cipher_suites)
232                 return -EINVAL;
233
234         return 0;
235 }
236
237 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
238 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
239 const unsigned char rfc1042_header[] __aligned(2) =
240         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
241 EXPORT_SYMBOL(rfc1042_header);
242
243 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
244 const unsigned char bridge_tunnel_header[] __aligned(2) =
245         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
246 EXPORT_SYMBOL(bridge_tunnel_header);
247
248 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
249 {
250         unsigned int hdrlen = 24;
251
252         if (ieee80211_is_data(fc)) {
253                 if (ieee80211_has_a4(fc))
254                         hdrlen = 30;
255                 if (ieee80211_is_data_qos(fc)) {
256                         hdrlen += IEEE80211_QOS_CTL_LEN;
257                         if (ieee80211_has_order(fc))
258                                 hdrlen += IEEE80211_HT_CTL_LEN;
259                 }
260                 goto out;
261         }
262
263         if (ieee80211_is_ctl(fc)) {
264                 /*
265                  * ACK and CTS are 10 bytes, all others 16. To see how
266                  * to get this condition consider
267                  *   subtype mask:   0b0000000011110000 (0x00F0)
268                  *   ACK subtype:    0b0000000011010000 (0x00D0)
269                  *   CTS subtype:    0b0000000011000000 (0x00C0)
270                  *   bits that matter:         ^^^      (0x00E0)
271                  *   value of those: 0b0000000011000000 (0x00C0)
272                  */
273                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
274                         hdrlen = 10;
275                 else
276                         hdrlen = 16;
277         }
278 out:
279         return hdrlen;
280 }
281 EXPORT_SYMBOL(ieee80211_hdrlen);
282
283 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
284 {
285         const struct ieee80211_hdr *hdr =
286                         (const struct ieee80211_hdr *)skb->data;
287         unsigned int hdrlen;
288
289         if (unlikely(skb->len < 10))
290                 return 0;
291         hdrlen = ieee80211_hdrlen(hdr->frame_control);
292         if (unlikely(hdrlen > skb->len))
293                 return 0;
294         return hdrlen;
295 }
296 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
297
298 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
299 {
300         int ae = meshhdr->flags & MESH_FLAGS_AE;
301         /* 7.1.3.5a.2 */
302         switch (ae) {
303         case 0:
304                 return 6;
305         case MESH_FLAGS_AE_A4:
306                 return 12;
307         case MESH_FLAGS_AE_A5_A6:
308                 return 18;
309         case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
310                 return 24;
311         default:
312                 return 6;
313         }
314 }
315
316 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
317                            enum nl80211_iftype iftype)
318 {
319         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
320         u16 hdrlen, ethertype;
321         u8 *payload;
322         u8 dst[ETH_ALEN];
323         u8 src[ETH_ALEN] __aligned(2);
324
325         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
326                 return -1;
327
328         hdrlen = ieee80211_hdrlen(hdr->frame_control);
329
330         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
331          * header
332          * IEEE 802.11 address fields:
333          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
334          *   0     0   DA    SA    BSSID n/a
335          *   0     1   DA    BSSID SA    n/a
336          *   1     0   BSSID SA    DA    n/a
337          *   1     1   RA    TA    DA    SA
338          */
339         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
340         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
341
342         switch (hdr->frame_control &
343                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
344         case cpu_to_le16(IEEE80211_FCTL_TODS):
345                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
346                              iftype != NL80211_IFTYPE_AP_VLAN &&
347                              iftype != NL80211_IFTYPE_P2P_GO))
348                         return -1;
349                 break;
350         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
351                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
352                              iftype != NL80211_IFTYPE_MESH_POINT &&
353                              iftype != NL80211_IFTYPE_AP_VLAN &&
354                              iftype != NL80211_IFTYPE_STATION))
355                         return -1;
356                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
357                         struct ieee80211s_hdr *meshdr =
358                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
359                         /* make sure meshdr->flags is on the linear part */
360                         if (!pskb_may_pull(skb, hdrlen + 1))
361                                 return -1;
362                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
363                                 skb_copy_bits(skb, hdrlen +
364                                         offsetof(struct ieee80211s_hdr, eaddr1),
365                                         dst, ETH_ALEN);
366                                 skb_copy_bits(skb, hdrlen +
367                                         offsetof(struct ieee80211s_hdr, eaddr2),
368                                         src, ETH_ALEN);
369                         }
370                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
371                 }
372                 break;
373         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
374                 if ((iftype != NL80211_IFTYPE_STATION &&
375                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
376                      iftype != NL80211_IFTYPE_MESH_POINT) ||
377                     (is_multicast_ether_addr(dst) &&
378                      !compare_ether_addr(src, addr)))
379                         return -1;
380                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
381                         struct ieee80211s_hdr *meshdr =
382                                 (struct ieee80211s_hdr *) (skb->data + hdrlen);
383                         /* make sure meshdr->flags is on the linear part */
384                         if (!pskb_may_pull(skb, hdrlen + 1))
385                                 return -1;
386                         if (meshdr->flags & MESH_FLAGS_AE_A4)
387                                 skb_copy_bits(skb, hdrlen +
388                                         offsetof(struct ieee80211s_hdr, eaddr1),
389                                         src, ETH_ALEN);
390                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
391                 }
392                 break;
393         case cpu_to_le16(0):
394                 if (iftype != NL80211_IFTYPE_ADHOC)
395                         return -1;
396                 break;
397         }
398
399         if (!pskb_may_pull(skb, hdrlen + 8))
400                 return -1;
401
402         payload = skb->data + hdrlen;
403         ethertype = (payload[6] << 8) | payload[7];
404
405         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
406                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
407                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
408                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
409                  * replace EtherType */
410                 skb_pull(skb, hdrlen + 6);
411                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
412                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
413         } else {
414                 struct ethhdr *ehdr;
415                 __be16 len;
416
417                 skb_pull(skb, hdrlen);
418                 len = htons(skb->len);
419                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
420                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
421                 memcpy(ehdr->h_source, src, ETH_ALEN);
422                 ehdr->h_proto = len;
423         }
424         return 0;
425 }
426 EXPORT_SYMBOL(ieee80211_data_to_8023);
427
428 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
429                              enum nl80211_iftype iftype, u8 *bssid, bool qos)
430 {
431         struct ieee80211_hdr hdr;
432         u16 hdrlen, ethertype;
433         __le16 fc;
434         const u8 *encaps_data;
435         int encaps_len, skip_header_bytes;
436         int nh_pos, h_pos;
437         int head_need;
438
439         if (unlikely(skb->len < ETH_HLEN))
440                 return -EINVAL;
441
442         nh_pos = skb_network_header(skb) - skb->data;
443         h_pos = skb_transport_header(skb) - skb->data;
444
445         /* convert Ethernet header to proper 802.11 header (based on
446          * operation mode) */
447         ethertype = (skb->data[12] << 8) | skb->data[13];
448         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
449
450         switch (iftype) {
451         case NL80211_IFTYPE_AP:
452         case NL80211_IFTYPE_AP_VLAN:
453         case NL80211_IFTYPE_P2P_GO:
454                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
455                 /* DA BSSID SA */
456                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
457                 memcpy(hdr.addr2, addr, ETH_ALEN);
458                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
459                 hdrlen = 24;
460                 break;
461         case NL80211_IFTYPE_STATION:
462         case NL80211_IFTYPE_P2P_CLIENT:
463                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
464                 /* BSSID SA DA */
465                 memcpy(hdr.addr1, bssid, ETH_ALEN);
466                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
467                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
468                 hdrlen = 24;
469                 break;
470         case NL80211_IFTYPE_ADHOC:
471                 /* DA SA BSSID */
472                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
473                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
474                 memcpy(hdr.addr3, bssid, ETH_ALEN);
475                 hdrlen = 24;
476                 break;
477         default:
478                 return -EOPNOTSUPP;
479         }
480
481         if (qos) {
482                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
483                 hdrlen += 2;
484         }
485
486         hdr.frame_control = fc;
487         hdr.duration_id = 0;
488         hdr.seq_ctrl = 0;
489
490         skip_header_bytes = ETH_HLEN;
491         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
492                 encaps_data = bridge_tunnel_header;
493                 encaps_len = sizeof(bridge_tunnel_header);
494                 skip_header_bytes -= 2;
495         } else if (ethertype > 0x600) {
496                 encaps_data = rfc1042_header;
497                 encaps_len = sizeof(rfc1042_header);
498                 skip_header_bytes -= 2;
499         } else {
500                 encaps_data = NULL;
501                 encaps_len = 0;
502         }
503
504         skb_pull(skb, skip_header_bytes);
505         nh_pos -= skip_header_bytes;
506         h_pos -= skip_header_bytes;
507
508         head_need = hdrlen + encaps_len - skb_headroom(skb);
509
510         if (head_need > 0 || skb_cloned(skb)) {
511                 head_need = max(head_need, 0);
512                 if (head_need)
513                         skb_orphan(skb);
514
515                 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
516                         pr_err("failed to reallocate Tx buffer\n");
517                         return -ENOMEM;
518                 }
519                 skb->truesize += head_need;
520         }
521
522         if (encaps_data) {
523                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
524                 nh_pos += encaps_len;
525                 h_pos += encaps_len;
526         }
527
528         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
529
530         nh_pos += hdrlen;
531         h_pos += hdrlen;
532
533         /* Update skb pointers to various headers since this modified frame
534          * is going to go through Linux networking code that may potentially
535          * need things like pointer to IP header. */
536         skb_set_mac_header(skb, 0);
537         skb_set_network_header(skb, nh_pos);
538         skb_set_transport_header(skb, h_pos);
539
540         return 0;
541 }
542 EXPORT_SYMBOL(ieee80211_data_from_8023);
543
544
545 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
546                               const u8 *addr, enum nl80211_iftype iftype,
547                               const unsigned int extra_headroom,
548                               bool has_80211_header)
549 {
550         struct sk_buff *frame = NULL;
551         u16 ethertype;
552         u8 *payload;
553         const struct ethhdr *eth;
554         int remaining, err;
555         u8 dst[ETH_ALEN], src[ETH_ALEN];
556
557         if (has_80211_header) {
558                 err = ieee80211_data_to_8023(skb, addr, iftype);
559                 if (err)
560                         goto out;
561
562                 /* skip the wrapping header */
563                 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
564                 if (!eth)
565                         goto out;
566         } else {
567                 eth = (struct ethhdr *) skb->data;
568         }
569
570         while (skb != frame) {
571                 u8 padding;
572                 __be16 len = eth->h_proto;
573                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
574
575                 remaining = skb->len;
576                 memcpy(dst, eth->h_dest, ETH_ALEN);
577                 memcpy(src, eth->h_source, ETH_ALEN);
578
579                 padding = (4 - subframe_len) & 0x3;
580                 /* the last MSDU has no padding */
581                 if (subframe_len > remaining)
582                         goto purge;
583
584                 skb_pull(skb, sizeof(struct ethhdr));
585                 /* reuse skb for the last subframe */
586                 if (remaining <= subframe_len + padding)
587                         frame = skb;
588                 else {
589                         unsigned int hlen = ALIGN(extra_headroom, 4);
590                         /*
591                          * Allocate and reserve two bytes more for payload
592                          * alignment since sizeof(struct ethhdr) is 14.
593                          */
594                         frame = dev_alloc_skb(hlen + subframe_len + 2);
595                         if (!frame)
596                                 goto purge;
597
598                         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
599                         memcpy(skb_put(frame, ntohs(len)), skb->data,
600                                 ntohs(len));
601
602                         eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
603                                                         padding);
604                         if (!eth) {
605                                 dev_kfree_skb(frame);
606                                 goto purge;
607                         }
608                 }
609
610                 skb_reset_network_header(frame);
611                 frame->dev = skb->dev;
612                 frame->priority = skb->priority;
613
614                 payload = frame->data;
615                 ethertype = (payload[6] << 8) | payload[7];
616
617                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
618                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
619                            compare_ether_addr(payload,
620                                               bridge_tunnel_header) == 0)) {
621                         /* remove RFC1042 or Bridge-Tunnel
622                          * encapsulation and replace EtherType */
623                         skb_pull(frame, 6);
624                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
625                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
626                 } else {
627                         memcpy(skb_push(frame, sizeof(__be16)), &len,
628                                 sizeof(__be16));
629                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
630                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
631                 }
632                 __skb_queue_tail(list, frame);
633         }
634
635         return;
636
637  purge:
638         __skb_queue_purge(list);
639  out:
640         dev_kfree_skb(skb);
641 }
642 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
643
644 /* Given a data frame determine the 802.1p/1d tag to use. */
645 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
646 {
647         unsigned int dscp;
648
649         /* skb->priority values from 256->263 are magic values to
650          * directly indicate a specific 802.1d priority.  This is used
651          * to allow 802.1d priority to be passed directly in from VLAN
652          * tags, etc.
653          */
654         if (skb->priority >= 256 && skb->priority <= 263)
655                 return skb->priority - 256;
656
657         switch (skb->protocol) {
658         case htons(ETH_P_IP):
659                 dscp = ip_hdr(skb)->tos & 0xfc;
660                 break;
661         default:
662                 return 0;
663         }
664
665         return dscp >> 5;
666 }
667 EXPORT_SYMBOL(cfg80211_classify8021d);
668
669 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
670 {
671         u8 *end, *pos;
672
673         pos = bss->information_elements;
674         if (pos == NULL)
675                 return NULL;
676         end = pos + bss->len_information_elements;
677
678         while (pos + 1 < end) {
679                 if (pos + 2 + pos[1] > end)
680                         break;
681                 if (pos[0] == ie)
682                         return pos;
683                 pos += 2 + pos[1];
684         }
685
686         return NULL;
687 }
688 EXPORT_SYMBOL(ieee80211_bss_get_ie);
689
690 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
691 {
692         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
693         struct net_device *dev = wdev->netdev;
694         int i;
695
696         if (!wdev->connect_keys)
697                 return;
698
699         for (i = 0; i < 6; i++) {
700                 if (!wdev->connect_keys->params[i].cipher)
701                         continue;
702                 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
703                                         &wdev->connect_keys->params[i])) {
704                         netdev_err(dev, "failed to set key %d\n", i);
705                         continue;
706                 }
707                 if (wdev->connect_keys->def == i)
708                         if (rdev->ops->set_default_key(wdev->wiphy, dev,
709                                                        i, true, true)) {
710                                 netdev_err(dev, "failed to set defkey %d\n", i);
711                                 continue;
712                         }
713                 if (wdev->connect_keys->defmgmt == i)
714                         if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
715                                 netdev_err(dev, "failed to set mgtdef %d\n", i);
716         }
717
718         kfree(wdev->connect_keys);
719         wdev->connect_keys = NULL;
720 }
721
722 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
723 {
724         struct cfg80211_event *ev;
725         unsigned long flags;
726         const u8 *bssid = NULL;
727
728         spin_lock_irqsave(&wdev->event_lock, flags);
729         while (!list_empty(&wdev->event_list)) {
730                 ev = list_first_entry(&wdev->event_list,
731                                       struct cfg80211_event, list);
732                 list_del(&ev->list);
733                 spin_unlock_irqrestore(&wdev->event_lock, flags);
734
735                 wdev_lock(wdev);
736                 switch (ev->type) {
737                 case EVENT_CONNECT_RESULT:
738                         if (!is_zero_ether_addr(ev->cr.bssid))
739                                 bssid = ev->cr.bssid;
740                         __cfg80211_connect_result(
741                                 wdev->netdev, bssid,
742                                 ev->cr.req_ie, ev->cr.req_ie_len,
743                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
744                                 ev->cr.status,
745                                 ev->cr.status == WLAN_STATUS_SUCCESS,
746                                 NULL);
747                         break;
748                 case EVENT_ROAMED:
749                         __cfg80211_roamed(wdev, ev->rm.channel, ev->rm.bssid,
750                                           ev->rm.req_ie, ev->rm.req_ie_len,
751                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
752                         break;
753                 case EVENT_DISCONNECTED:
754                         __cfg80211_disconnected(wdev->netdev,
755                                                 ev->dc.ie, ev->dc.ie_len,
756                                                 ev->dc.reason, true);
757                         break;
758                 case EVENT_IBSS_JOINED:
759                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
760                         break;
761                 }
762                 wdev_unlock(wdev);
763
764                 kfree(ev);
765
766                 spin_lock_irqsave(&wdev->event_lock, flags);
767         }
768         spin_unlock_irqrestore(&wdev->event_lock, flags);
769 }
770
771 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
772 {
773         struct wireless_dev *wdev;
774
775         ASSERT_RTNL();
776         ASSERT_RDEV_LOCK(rdev);
777
778         mutex_lock(&rdev->devlist_mtx);
779
780         list_for_each_entry(wdev, &rdev->netdev_list, list)
781                 cfg80211_process_wdev_events(wdev);
782
783         mutex_unlock(&rdev->devlist_mtx);
784 }
785
786 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
787                           struct net_device *dev, enum nl80211_iftype ntype,
788                           u32 *flags, struct vif_params *params)
789 {
790         int err;
791         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
792
793         ASSERT_RDEV_LOCK(rdev);
794
795         /* don't support changing VLANs, you just re-create them */
796         if (otype == NL80211_IFTYPE_AP_VLAN)
797                 return -EOPNOTSUPP;
798
799         if (!rdev->ops->change_virtual_intf ||
800             !(rdev->wiphy.interface_modes & (1 << ntype)))
801                 return -EOPNOTSUPP;
802
803         /* if it's part of a bridge, reject changing type to station/ibss */
804         if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
805             (ntype == NL80211_IFTYPE_ADHOC ||
806              ntype == NL80211_IFTYPE_STATION ||
807              ntype == NL80211_IFTYPE_P2P_CLIENT))
808                 return -EBUSY;
809
810         if (ntype != otype) {
811                 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
812                                                     ntype);
813                 if (err)
814                         return err;
815
816                 dev->ieee80211_ptr->use_4addr = false;
817                 dev->ieee80211_ptr->mesh_id_up_len = 0;
818
819                 switch (otype) {
820                 case NL80211_IFTYPE_ADHOC:
821                         cfg80211_leave_ibss(rdev, dev, false);
822                         break;
823                 case NL80211_IFTYPE_STATION:
824                 case NL80211_IFTYPE_P2P_CLIENT:
825                         cfg80211_disconnect(rdev, dev,
826                                             WLAN_REASON_DEAUTH_LEAVING, true);
827                         break;
828                 case NL80211_IFTYPE_MESH_POINT:
829                         /* mesh should be handled? */
830                         break;
831                 default:
832                         break;
833                 }
834
835                 cfg80211_process_rdev_events(rdev);
836         }
837
838         err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
839                                              ntype, flags, params);
840
841         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
842
843         if (!err && params && params->use_4addr != -1)
844                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
845
846         if (!err) {
847                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
848                 switch (ntype) {
849                 case NL80211_IFTYPE_STATION:
850                         if (dev->ieee80211_ptr->use_4addr)
851                                 break;
852                         /* fall through */
853                 case NL80211_IFTYPE_P2P_CLIENT:
854                 case NL80211_IFTYPE_ADHOC:
855                         dev->priv_flags |= IFF_DONT_BRIDGE;
856                         break;
857                 case NL80211_IFTYPE_P2P_GO:
858                 case NL80211_IFTYPE_AP:
859                 case NL80211_IFTYPE_AP_VLAN:
860                 case NL80211_IFTYPE_WDS:
861                 case NL80211_IFTYPE_MESH_POINT:
862                         /* bridging OK */
863                         break;
864                 case NL80211_IFTYPE_MONITOR:
865                         /* monitor can't bridge anyway */
866                         break;
867                 case NL80211_IFTYPE_UNSPECIFIED:
868                 case NUM_NL80211_IFTYPES:
869                         /* not happening */
870                         break;
871                 }
872         }
873
874         return err;
875 }
876
877 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
878 {
879         int modulation, streams, bitrate;
880
881         if (!(rate->flags & RATE_INFO_FLAGS_MCS))
882                 return rate->legacy;
883
884         /* the formula below does only work for MCS values smaller than 32 */
885         if (rate->mcs >= 32)
886                 return 0;
887
888         modulation = rate->mcs & 7;
889         streams = (rate->mcs >> 3) + 1;
890
891         bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
892                         13500000 : 6500000;
893
894         if (modulation < 4)
895                 bitrate *= (modulation + 1);
896         else if (modulation == 4)
897                 bitrate *= (modulation + 2);
898         else
899                 bitrate *= (modulation + 3);
900
901         bitrate *= streams;
902
903         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
904                 bitrate = (bitrate / 9) * 10;
905
906         /* do NOT round down here */
907         return (bitrate + 50000) / 100000;
908 }
909
910 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
911                                  u32 beacon_int)
912 {
913         struct wireless_dev *wdev;
914         int res = 0;
915
916         if (!beacon_int)
917                 return -EINVAL;
918
919         mutex_lock(&rdev->devlist_mtx);
920
921         list_for_each_entry(wdev, &rdev->netdev_list, list) {
922                 if (!wdev->beacon_interval)
923                         continue;
924                 if (wdev->beacon_interval != beacon_int) {
925                         res = -EINVAL;
926                         break;
927                 }
928         }
929
930         mutex_unlock(&rdev->devlist_mtx);
931
932         return res;
933 }
934
935 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
936                                   struct wireless_dev *wdev,
937                                   enum nl80211_iftype iftype)
938 {
939         struct wireless_dev *wdev_iter;
940         int num[NUM_NL80211_IFTYPES];
941         int total = 1;
942         int i, j;
943
944         ASSERT_RTNL();
945
946         /* Always allow software iftypes */
947         if (rdev->wiphy.software_iftypes & BIT(iftype))
948                 return 0;
949
950         /*
951          * Drivers will gradually all set this flag, until all
952          * have it we only enforce for those that set it.
953          */
954         if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS))
955                 return 0;
956
957         memset(num, 0, sizeof(num));
958
959         num[iftype] = 1;
960
961         mutex_lock(&rdev->devlist_mtx);
962         list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
963                 if (wdev_iter == wdev)
964                         continue;
965                 if (!netif_running(wdev_iter->netdev))
966                         continue;
967
968                 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
969                         continue;
970
971                 num[wdev_iter->iftype]++;
972                 total++;
973         }
974         mutex_unlock(&rdev->devlist_mtx);
975
976         for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
977                 const struct ieee80211_iface_combination *c;
978                 struct ieee80211_iface_limit *limits;
979
980                 c = &rdev->wiphy.iface_combinations[i];
981
982                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
983                                  GFP_KERNEL);
984                 if (!limits)
985                         return -ENOMEM;
986                 if (total > c->max_interfaces)
987                         goto cont;
988
989                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
990                         if (rdev->wiphy.software_iftypes & BIT(iftype))
991                                 continue;
992                         for (j = 0; j < c->n_limits; j++) {
993                                 if (!(limits[j].types & iftype))
994                                         continue;
995                                 if (limits[j].max < num[iftype])
996                                         goto cont;
997                                 limits[j].max -= num[iftype];
998                         }
999                 }
1000                 /* yay, it fits */
1001                 kfree(limits);
1002                 return 0;
1003  cont:
1004                 kfree(limits);
1005         }
1006
1007         return -EBUSY;
1008 }
1009
1010 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1011                            const u8 *rates, unsigned int n_rates,
1012                            u32 *mask)
1013 {
1014         int i, j;
1015
1016         if (!sband)
1017                 return -EINVAL;
1018
1019         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1020                 return -EINVAL;
1021
1022         *mask = 0;
1023
1024         for (i = 0; i < n_rates; i++) {
1025                 int rate = (rates[i] & 0x7f) * 5;
1026                 bool found = false;
1027
1028                 for (j = 0; j < sband->n_bitrates; j++) {
1029                         if (sband->bitrates[j].bitrate == rate) {
1030                                 found = true;
1031                                 *mask |= BIT(j);
1032                                 break;
1033                         }
1034                 }
1035                 if (!found)
1036                         return -EINVAL;
1037         }
1038
1039         /*
1040          * mask must have at least one bit set here since we
1041          * didn't accept a 0-length rates array nor allowed
1042          * entries in the array that didn't exist
1043          */
1044
1045         return 0;
1046 }