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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 | { |
549 | struct sk_buff *frame = NULL; |
550 | u16 ethertype; |
551 | u8 *payload; |
552 | const struct ethhdr *eth; |
553 | int remaining, err; |
554 | u8 dst[ETH_ALEN], src[ETH_ALEN]; |
555 | |
556 | err = ieee80211_data_to_8023(skb, addr, iftype); |
557 | if (err) |
558 | goto out; |
559 | |
560 | /* skip the wrapping header */ |
561 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); |
562 | if (!eth) |
563 | goto out; |
564 | |
565 | while (skb != frame) { |
566 | u8 padding; |
567 | __be16 len = eth->h_proto; |
568 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); |
569 | |
570 | remaining = skb->len; |
571 | memcpy(dst, eth->h_dest, ETH_ALEN); |
572 | memcpy(src, eth->h_source, ETH_ALEN); |
573 | |
574 | padding = (4 - subframe_len) & 0x3; |
575 | /* the last MSDU has no padding */ |
576 | if (subframe_len > remaining) |
577 | goto purge; |
578 | |
579 | skb_pull(skb, sizeof(struct ethhdr)); |
580 | /* reuse skb for the last subframe */ |
581 | if (remaining <= subframe_len + padding) |
582 | frame = skb; |
583 | else { |
584 | unsigned int hlen = ALIGN(extra_headroom, 4); |
585 | /* |
586 | * Allocate and reserve two bytes more for payload |
587 | * alignment since sizeof(struct ethhdr) is 14. |
588 | */ |
589 | frame = dev_alloc_skb(hlen + subframe_len + 2); |
590 | if (!frame) |
591 | goto purge; |
592 | |
593 | skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); |
594 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
595 | ntohs(len)); |
596 | |
597 | eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + |
598 | padding); |
599 | if (!eth) { |
600 | dev_kfree_skb(frame); |
601 | goto purge; |
602 | } |
603 | } |
604 | |
605 | skb_reset_network_header(frame); |
606 | frame->dev = skb->dev; |
607 | frame->priority = skb->priority; |
608 | |
609 | payload = frame->data; |
610 | ethertype = (payload[6] << 8) | payload[7]; |
611 | |
612 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && |
613 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
614 | compare_ether_addr(payload, |
615 | bridge_tunnel_header) == 0)) { |
616 | /* remove RFC1042 or Bridge-Tunnel |
617 | * encapsulation and replace EtherType */ |
618 | skb_pull(frame, 6); |
619 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
620 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); |
621 | } else { |
622 | memcpy(skb_push(frame, sizeof(__be16)), &len, |
623 | sizeof(__be16)); |
624 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
625 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); |
626 | } |
627 | __skb_queue_tail(list, frame); |
628 | } |
629 | |
630 | return; |
631 | |
632 | purge: |
633 | __skb_queue_purge(list); |
634 | out: |
635 | dev_kfree_skb(skb); |
636 | } |
637 | EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); |
638 | |
639 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
640 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) |
641 | { |
642 | unsigned int dscp; |
643 | |
644 | /* skb->priority values from 256->263 are magic values to |
645 | * directly indicate a specific 802.1d priority. This is used |
646 | * to allow 802.1d priority to be passed directly in from VLAN |
647 | * tags, etc. |
648 | */ |
649 | if (skb->priority >= 256 && skb->priority <= 263) |
650 | return skb->priority - 256; |
651 | |
652 | switch (skb->protocol) { |
653 | case htons(ETH_P_IP): |
654 | dscp = ip_hdr(skb)->tos & 0xfc; |
655 | break; |
656 | default: |
657 | return 0; |
658 | } |
659 | |
660 | return dscp >> 5; |
661 | } |
662 | EXPORT_SYMBOL(cfg80211_classify8021d); |
663 | |
664 | const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) |
665 | { |
666 | u8 *end, *pos; |
667 | |
668 | pos = bss->information_elements; |
669 | if (pos == NULL) |
670 | return NULL; |
671 | end = pos + bss->len_information_elements; |
672 | |
673 | while (pos + 1 < end) { |
674 | if (pos + 2 + pos[1] > end) |
675 | break; |
676 | if (pos[0] == ie) |
677 | return pos; |
678 | pos += 2 + pos[1]; |
679 | } |
680 | |
681 | return NULL; |
682 | } |
683 | EXPORT_SYMBOL(ieee80211_bss_get_ie); |
684 | |
685 | void cfg80211_upload_connect_keys(struct wireless_dev *wdev) |
686 | { |
687 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); |
688 | struct net_device *dev = wdev->netdev; |
689 | int i; |
690 | |
691 | if (!wdev->connect_keys) |
692 | return; |
693 | |
694 | for (i = 0; i < 6; i++) { |
695 | if (!wdev->connect_keys->params[i].cipher) |
696 | continue; |
697 | if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL, |
698 | &wdev->connect_keys->params[i])) { |
699 | netdev_err(dev, "failed to set key %d\n", i); |
700 | continue; |
701 | } |
702 | if (wdev->connect_keys->def == i) |
703 | if (rdev->ops->set_default_key(wdev->wiphy, dev, |
704 | i, true, true)) { |
705 | netdev_err(dev, "failed to set defkey %d\n", i); |
706 | continue; |
707 | } |
708 | if (wdev->connect_keys->defmgmt == i) |
709 | if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i)) |
710 | netdev_err(dev, "failed to set mgtdef %d\n", i); |
711 | } |
712 | |
713 | kfree(wdev->connect_keys); |
714 | wdev->connect_keys = NULL; |
715 | } |
716 | |
717 | static void cfg80211_process_wdev_events(struct wireless_dev *wdev) |
718 | { |
719 | struct cfg80211_event *ev; |
720 | unsigned long flags; |
721 | const u8 *bssid = NULL; |
722 | |
723 | spin_lock_irqsave(&wdev->event_lock, flags); |
724 | while (!list_empty(&wdev->event_list)) { |
725 | ev = list_first_entry(&wdev->event_list, |
726 | struct cfg80211_event, list); |
727 | list_del(&ev->list); |
728 | spin_unlock_irqrestore(&wdev->event_lock, flags); |
729 | |
730 | wdev_lock(wdev); |
731 | switch (ev->type) { |
732 | case EVENT_CONNECT_RESULT: |
733 | if (!is_zero_ether_addr(ev->cr.bssid)) |
734 | bssid = ev->cr.bssid; |
735 | __cfg80211_connect_result( |
736 | wdev->netdev, bssid, |
737 | ev->cr.req_ie, ev->cr.req_ie_len, |
738 | ev->cr.resp_ie, ev->cr.resp_ie_len, |
739 | ev->cr.status, |
740 | ev->cr.status == WLAN_STATUS_SUCCESS, |
741 | NULL); |
742 | break; |
743 | case EVENT_ROAMED: |
744 | __cfg80211_roamed(wdev, ev->rm.bssid, |
745 | ev->rm.req_ie, ev->rm.req_ie_len, |
746 | ev->rm.resp_ie, ev->rm.resp_ie_len); |
747 | break; |
748 | case EVENT_DISCONNECTED: |
749 | __cfg80211_disconnected(wdev->netdev, |
750 | ev->dc.ie, ev->dc.ie_len, |
751 | ev->dc.reason, true); |
752 | break; |
753 | case EVENT_IBSS_JOINED: |
754 | __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); |
755 | break; |
756 | } |
757 | wdev_unlock(wdev); |
758 | |
759 | kfree(ev); |
760 | |
761 | spin_lock_irqsave(&wdev->event_lock, flags); |
762 | } |
763 | spin_unlock_irqrestore(&wdev->event_lock, flags); |
764 | } |
765 | |
766 | void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) |
767 | { |
768 | struct wireless_dev *wdev; |
769 | |
770 | ASSERT_RTNL(); |
771 | ASSERT_RDEV_LOCK(rdev); |
772 | |
773 | mutex_lock(&rdev->devlist_mtx); |
774 | |
775 | list_for_each_entry(wdev, &rdev->netdev_list, list) |
776 | cfg80211_process_wdev_events(wdev); |
777 | |
778 | mutex_unlock(&rdev->devlist_mtx); |
779 | } |
780 | |
781 | int cfg80211_change_iface(struct cfg80211_registered_device *rdev, |
782 | struct net_device *dev, enum nl80211_iftype ntype, |
783 | u32 *flags, struct vif_params *params) |
784 | { |
785 | int err; |
786 | enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; |
787 | |
788 | ASSERT_RDEV_LOCK(rdev); |
789 | |
790 | /* don't support changing VLANs, you just re-create them */ |
791 | if (otype == NL80211_IFTYPE_AP_VLAN) |
792 | return -EOPNOTSUPP; |
793 | |
794 | if (!rdev->ops->change_virtual_intf || |
795 | !(rdev->wiphy.interface_modes & (1 << ntype))) |
796 | return -EOPNOTSUPP; |
797 | |
798 | /* if it's part of a bridge, reject changing type to station/ibss */ |
799 | if ((dev->priv_flags & IFF_BRIDGE_PORT) && |
800 | (ntype == NL80211_IFTYPE_ADHOC || |
801 | ntype == NL80211_IFTYPE_STATION || |
802 | ntype == NL80211_IFTYPE_P2P_CLIENT)) |
803 | return -EBUSY; |
804 | |
805 | if (ntype != otype) { |
806 | dev->ieee80211_ptr->use_4addr = false; |
807 | dev->ieee80211_ptr->mesh_id_up_len = 0; |
808 | |
809 | switch (otype) { |
810 | case NL80211_IFTYPE_ADHOC: |
811 | cfg80211_leave_ibss(rdev, dev, false); |
812 | break; |
813 | case NL80211_IFTYPE_STATION: |
814 | case NL80211_IFTYPE_P2P_CLIENT: |
815 | cfg80211_disconnect(rdev, dev, |
816 | WLAN_REASON_DEAUTH_LEAVING, true); |
817 | break; |
818 | case NL80211_IFTYPE_MESH_POINT: |
819 | /* mesh should be handled? */ |
820 | break; |
821 | default: |
822 | break; |
823 | } |
824 | |
825 | cfg80211_process_rdev_events(rdev); |
826 | } |
827 | |
828 | err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev, |
829 | ntype, flags, params); |
830 | |
831 | WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); |
832 | |
833 | if (!err && params && params->use_4addr != -1) |
834 | dev->ieee80211_ptr->use_4addr = params->use_4addr; |
835 | |
836 | if (!err) { |
837 | dev->priv_flags &= ~IFF_DONT_BRIDGE; |
838 | switch (ntype) { |
839 | case NL80211_IFTYPE_STATION: |
840 | if (dev->ieee80211_ptr->use_4addr) |
841 | break; |
842 | /* fall through */ |
843 | case NL80211_IFTYPE_P2P_CLIENT: |
844 | case NL80211_IFTYPE_ADHOC: |
845 | dev->priv_flags |= IFF_DONT_BRIDGE; |
846 | break; |
847 | case NL80211_IFTYPE_P2P_GO: |
848 | case NL80211_IFTYPE_AP: |
849 | case NL80211_IFTYPE_AP_VLAN: |
850 | case NL80211_IFTYPE_WDS: |
851 | case NL80211_IFTYPE_MESH_POINT: |
852 | /* bridging OK */ |
853 | break; |
854 | case NL80211_IFTYPE_MONITOR: |
855 | /* monitor can't bridge anyway */ |
856 | break; |
857 | case NL80211_IFTYPE_UNSPECIFIED: |
858 | case NUM_NL80211_IFTYPES: |
859 | /* not happening */ |
860 | break; |
861 | } |
862 | } |
863 | |
864 | return err; |
865 | } |
866 | |
867 | u16 cfg80211_calculate_bitrate(struct rate_info *rate) |
868 | { |
869 | int modulation, streams, bitrate; |
870 | |
871 | if (!(rate->flags & RATE_INFO_FLAGS_MCS)) |
872 | return rate->legacy; |
873 | |
874 | /* the formula below does only work for MCS values smaller than 32 */ |
875 | if (rate->mcs >= 32) |
876 | return 0; |
877 | |
878 | modulation = rate->mcs & 7; |
879 | streams = (rate->mcs >> 3) + 1; |
880 | |
881 | bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ? |
882 | 13500000 : 6500000; |
883 | |
884 | if (modulation < 4) |
885 | bitrate *= (modulation + 1); |
886 | else if (modulation == 4) |
887 | bitrate *= (modulation + 2); |
888 | else |
889 | bitrate *= (modulation + 3); |
890 | |
891 | bitrate *= streams; |
892 | |
893 | if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) |
894 | bitrate = (bitrate / 9) * 10; |
895 | |
896 | /* do NOT round down here */ |
897 | return (bitrate + 50000) / 100000; |
898 | } |
899 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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