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Commit | Line | Data |
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8318d78a JB |
1 | /* |
2 | * Wireless utility functions | |
3 | * | |
d3236553 | 4 | * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> |
8318d78a | 5 | */ |
d3236553 | 6 | #include <linux/bitops.h> |
e31a16d6 | 7 | #include <linux/etherdevice.h> |
d3236553 | 8 | #include <net/cfg80211.h> |
e31a16d6 | 9 | #include <net/ip.h> |
8318d78a JB |
10 | #include "core.h" |
11 | ||
bd815252 JB |
12 | struct ieee80211_rate * |
13 | ieee80211_get_response_rate(struct ieee80211_supported_band *sband, | |
881d948c | 14 | u32 basic_rates, int bitrate) |
bd815252 JB |
15 | { |
16 | struct ieee80211_rate *result = &sband->bitrates[0]; | |
17 | int i; | |
18 | ||
19 | for (i = 0; i < sband->n_bitrates; i++) { | |
20 | if (!(basic_rates & BIT(i))) | |
21 | continue; | |
22 | if (sband->bitrates[i].bitrate > bitrate) | |
23 | continue; | |
24 | result = &sband->bitrates[i]; | |
25 | } | |
26 | ||
27 | return result; | |
28 | } | |
29 | EXPORT_SYMBOL(ieee80211_get_response_rate); | |
30 | ||
8318d78a JB |
31 | int ieee80211_channel_to_frequency(int chan) |
32 | { | |
33 | if (chan < 14) | |
34 | return 2407 + chan * 5; | |
35 | ||
36 | if (chan == 14) | |
37 | return 2484; | |
38 | ||
39 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
40 | return (chan + 1000) * 5; | |
41 | } | |
42 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); | |
43 | ||
44 | int ieee80211_frequency_to_channel(int freq) | |
45 | { | |
46 | if (freq == 2484) | |
47 | return 14; | |
48 | ||
49 | if (freq < 2484) | |
50 | return (freq - 2407) / 5; | |
51 | ||
52 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
53 | return freq/5 - 1000; | |
54 | } | |
55 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); | |
56 | ||
6c507cd0 JB |
57 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
58 | int freq) | |
906c730a JB |
59 | { |
60 | enum ieee80211_band band; | |
61 | struct ieee80211_supported_band *sband; | |
62 | int i; | |
63 | ||
64 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
65 | sband = wiphy->bands[band]; | |
66 | ||
67 | if (!sband) | |
68 | continue; | |
69 | ||
70 | for (i = 0; i < sband->n_channels; i++) { | |
71 | if (sband->channels[i].center_freq == freq) | |
72 | return &sband->channels[i]; | |
73 | } | |
74 | } | |
75 | ||
76 | return NULL; | |
77 | } | |
6c507cd0 | 78 | EXPORT_SYMBOL(__ieee80211_get_channel); |
906c730a | 79 | |
8318d78a JB |
80 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
81 | enum ieee80211_band band) | |
82 | { | |
83 | int i, want; | |
84 | ||
85 | switch (band) { | |
86 | case IEEE80211_BAND_5GHZ: | |
87 | want = 3; | |
88 | for (i = 0; i < sband->n_bitrates; i++) { | |
89 | if (sband->bitrates[i].bitrate == 60 || | |
90 | sband->bitrates[i].bitrate == 120 || | |
91 | sband->bitrates[i].bitrate == 240) { | |
92 | sband->bitrates[i].flags |= | |
93 | IEEE80211_RATE_MANDATORY_A; | |
94 | want--; | |
95 | } | |
96 | } | |
97 | WARN_ON(want); | |
98 | break; | |
99 | case IEEE80211_BAND_2GHZ: | |
100 | want = 7; | |
101 | for (i = 0; i < sband->n_bitrates; i++) { | |
102 | if (sband->bitrates[i].bitrate == 10) { | |
103 | sband->bitrates[i].flags |= | |
104 | IEEE80211_RATE_MANDATORY_B | | |
105 | IEEE80211_RATE_MANDATORY_G; | |
106 | want--; | |
107 | } | |
108 | ||
109 | if (sband->bitrates[i].bitrate == 20 || | |
110 | sband->bitrates[i].bitrate == 55 || | |
111 | sband->bitrates[i].bitrate == 110 || | |
112 | sband->bitrates[i].bitrate == 60 || | |
113 | sband->bitrates[i].bitrate == 120 || | |
114 | sband->bitrates[i].bitrate == 240) { | |
115 | sband->bitrates[i].flags |= | |
116 | IEEE80211_RATE_MANDATORY_G; | |
117 | want--; | |
118 | } | |
119 | ||
aac09fbf JB |
120 | if (sband->bitrates[i].bitrate != 10 && |
121 | sband->bitrates[i].bitrate != 20 && | |
122 | sband->bitrates[i].bitrate != 55 && | |
123 | sband->bitrates[i].bitrate != 110) | |
8318d78a JB |
124 | sband->bitrates[i].flags |= |
125 | IEEE80211_RATE_ERP_G; | |
126 | } | |
406f2388 | 127 | WARN_ON(want != 0 && want != 3 && want != 6); |
8318d78a JB |
128 | break; |
129 | case IEEE80211_NUM_BANDS: | |
130 | WARN_ON(1); | |
131 | break; | |
132 | } | |
133 | } | |
134 | ||
135 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) | |
136 | { | |
137 | enum ieee80211_band band; | |
138 | ||
139 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
140 | if (wiphy->bands[band]) | |
141 | set_mandatory_flags_band(wiphy->bands[band], band); | |
142 | } | |
08645126 | 143 | |
fffd0934 JB |
144 | int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, |
145 | struct key_params *params, int key_idx, | |
08645126 JB |
146 | const u8 *mac_addr) |
147 | { | |
fffd0934 JB |
148 | int i; |
149 | ||
08645126 JB |
150 | if (key_idx > 5) |
151 | return -EINVAL; | |
152 | ||
153 | /* | |
154 | * Disallow pairwise keys with non-zero index unless it's WEP | |
155 | * (because current deployments use pairwise WEP keys with | |
156 | * non-zero indizes but 802.11i clearly specifies to use zero) | |
157 | */ | |
158 | if (mac_addr && key_idx && | |
159 | params->cipher != WLAN_CIPHER_SUITE_WEP40 && | |
160 | params->cipher != WLAN_CIPHER_SUITE_WEP104) | |
161 | return -EINVAL; | |
162 | ||
08645126 JB |
163 | switch (params->cipher) { |
164 | case WLAN_CIPHER_SUITE_WEP40: | |
8fc0fee0 | 165 | if (params->key_len != WLAN_KEY_LEN_WEP40) |
08645126 JB |
166 | return -EINVAL; |
167 | break; | |
168 | case WLAN_CIPHER_SUITE_TKIP: | |
8fc0fee0 | 169 | if (params->key_len != WLAN_KEY_LEN_TKIP) |
08645126 JB |
170 | return -EINVAL; |
171 | break; | |
172 | case WLAN_CIPHER_SUITE_CCMP: | |
8fc0fee0 | 173 | if (params->key_len != WLAN_KEY_LEN_CCMP) |
08645126 JB |
174 | return -EINVAL; |
175 | break; | |
176 | case WLAN_CIPHER_SUITE_WEP104: | |
8fc0fee0 | 177 | if (params->key_len != WLAN_KEY_LEN_WEP104) |
08645126 JB |
178 | return -EINVAL; |
179 | break; | |
180 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
8fc0fee0 | 181 | if (params->key_len != WLAN_KEY_LEN_AES_CMAC) |
08645126 JB |
182 | return -EINVAL; |
183 | break; | |
184 | default: | |
185 | return -EINVAL; | |
186 | } | |
187 | ||
9f26a952 JM |
188 | if (params->seq) { |
189 | switch (params->cipher) { | |
190 | case WLAN_CIPHER_SUITE_WEP40: | |
191 | case WLAN_CIPHER_SUITE_WEP104: | |
192 | /* These ciphers do not use key sequence */ | |
193 | return -EINVAL; | |
194 | case WLAN_CIPHER_SUITE_TKIP: | |
195 | case WLAN_CIPHER_SUITE_CCMP: | |
196 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
197 | if (params->seq_len != 6) | |
198 | return -EINVAL; | |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
fffd0934 JB |
203 | for (i = 0; i < rdev->wiphy.n_cipher_suites; i++) |
204 | if (params->cipher == rdev->wiphy.cipher_suites[i]) | |
205 | break; | |
206 | if (i == rdev->wiphy.n_cipher_suites) | |
207 | return -EINVAL; | |
208 | ||
08645126 JB |
209 | return 0; |
210 | } | |
e31a16d6 ZY |
211 | |
212 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
213 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
214 | const unsigned char rfc1042_header[] __aligned(2) = | |
215 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
216 | EXPORT_SYMBOL(rfc1042_header); | |
217 | ||
218 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
219 | const unsigned char bridge_tunnel_header[] __aligned(2) = | |
220 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
221 | EXPORT_SYMBOL(bridge_tunnel_header); | |
222 | ||
223 | unsigned int ieee80211_hdrlen(__le16 fc) | |
224 | { | |
225 | unsigned int hdrlen = 24; | |
226 | ||
227 | if (ieee80211_is_data(fc)) { | |
228 | if (ieee80211_has_a4(fc)) | |
229 | hdrlen = 30; | |
230 | if (ieee80211_is_data_qos(fc)) | |
231 | hdrlen += IEEE80211_QOS_CTL_LEN; | |
232 | goto out; | |
233 | } | |
234 | ||
235 | if (ieee80211_is_ctl(fc)) { | |
236 | /* | |
237 | * ACK and CTS are 10 bytes, all others 16. To see how | |
238 | * to get this condition consider | |
239 | * subtype mask: 0b0000000011110000 (0x00F0) | |
240 | * ACK subtype: 0b0000000011010000 (0x00D0) | |
241 | * CTS subtype: 0b0000000011000000 (0x00C0) | |
242 | * bits that matter: ^^^ (0x00E0) | |
243 | * value of those: 0b0000000011000000 (0x00C0) | |
244 | */ | |
245 | if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) | |
246 | hdrlen = 10; | |
247 | else | |
248 | hdrlen = 16; | |
249 | } | |
250 | out: | |
251 | return hdrlen; | |
252 | } | |
253 | EXPORT_SYMBOL(ieee80211_hdrlen); | |
254 | ||
255 | unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) | |
256 | { | |
257 | const struct ieee80211_hdr *hdr = | |
258 | (const struct ieee80211_hdr *)skb->data; | |
259 | unsigned int hdrlen; | |
260 | ||
261 | if (unlikely(skb->len < 10)) | |
262 | return 0; | |
263 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
264 | if (unlikely(hdrlen > skb->len)) | |
265 | return 0; | |
266 | return hdrlen; | |
267 | } | |
268 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); | |
269 | ||
60fd2b67 | 270 | static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) |
e31a16d6 ZY |
271 | { |
272 | int ae = meshhdr->flags & MESH_FLAGS_AE; | |
273 | /* 7.1.3.5a.2 */ | |
274 | switch (ae) { | |
275 | case 0: | |
276 | return 6; | |
3c5772a5 | 277 | case MESH_FLAGS_AE_A4: |
e31a16d6 | 278 | return 12; |
3c5772a5 | 279 | case MESH_FLAGS_AE_A5_A6: |
e31a16d6 | 280 | return 18; |
3c5772a5 | 281 | case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): |
e31a16d6 ZY |
282 | return 24; |
283 | default: | |
284 | return 6; | |
285 | } | |
286 | } | |
287 | ||
eaf85ca7 | 288 | int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
289 | enum nl80211_iftype iftype) |
290 | { | |
291 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
292 | u16 hdrlen, ethertype; | |
293 | u8 *payload; | |
294 | u8 dst[ETH_ALEN]; | |
295 | u8 src[ETH_ALEN] __aligned(2); | |
296 | ||
297 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) | |
298 | return -1; | |
299 | ||
300 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
301 | ||
302 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
303 | * header | |
304 | * IEEE 802.11 address fields: | |
305 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
306 | * 0 0 DA SA BSSID n/a | |
307 | * 0 1 DA BSSID SA n/a | |
308 | * 1 0 BSSID SA DA n/a | |
309 | * 1 1 RA TA DA SA | |
310 | */ | |
311 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); | |
312 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
313 | ||
314 | switch (hdr->frame_control & | |
315 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
316 | case cpu_to_le16(IEEE80211_FCTL_TODS): | |
317 | if (unlikely(iftype != NL80211_IFTYPE_AP && | |
318 | iftype != NL80211_IFTYPE_AP_VLAN)) | |
319 | return -1; | |
320 | break; | |
321 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
322 | if (unlikely(iftype != NL80211_IFTYPE_WDS && | |
f14543ee FF |
323 | iftype != NL80211_IFTYPE_MESH_POINT && |
324 | iftype != NL80211_IFTYPE_AP_VLAN && | |
325 | iftype != NL80211_IFTYPE_STATION)) | |
e31a16d6 ZY |
326 | return -1; |
327 | if (iftype == NL80211_IFTYPE_MESH_POINT) { | |
328 | struct ieee80211s_hdr *meshdr = | |
329 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
330 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
331 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
332 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
333 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
334 | } | |
335 | } | |
336 | break; | |
337 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): | |
3c5772a5 JC |
338 | if ((iftype != NL80211_IFTYPE_STATION && |
339 | iftype != NL80211_IFTYPE_MESH_POINT) || | |
e31a16d6 ZY |
340 | (is_multicast_ether_addr(dst) && |
341 | !compare_ether_addr(src, addr))) | |
342 | return -1; | |
3c5772a5 JC |
343 | if (iftype == NL80211_IFTYPE_MESH_POINT) { |
344 | struct ieee80211s_hdr *meshdr = | |
345 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
346 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
347 | if (meshdr->flags & MESH_FLAGS_AE_A4) | |
348 | memcpy(src, meshdr->eaddr1, ETH_ALEN); | |
349 | } | |
e31a16d6 ZY |
350 | break; |
351 | case cpu_to_le16(0): | |
352 | if (iftype != NL80211_IFTYPE_ADHOC) | |
353 | return -1; | |
354 | break; | |
355 | } | |
356 | ||
357 | if (unlikely(skb->len - hdrlen < 8)) | |
358 | return -1; | |
359 | ||
360 | payload = skb->data + hdrlen; | |
361 | ethertype = (payload[6] << 8) | payload[7]; | |
362 | ||
363 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
364 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
365 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
366 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
367 | * replace EtherType */ | |
368 | skb_pull(skb, hdrlen + 6); | |
369 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
370 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
371 | } else { | |
372 | struct ethhdr *ehdr; | |
373 | __be16 len; | |
374 | ||
375 | skb_pull(skb, hdrlen); | |
376 | len = htons(skb->len); | |
377 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
378 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
379 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
380 | ehdr->h_proto = len; | |
381 | } | |
382 | return 0; | |
383 | } | |
384 | EXPORT_SYMBOL(ieee80211_data_to_8023); | |
385 | ||
eaf85ca7 | 386 | int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
387 | enum nl80211_iftype iftype, u8 *bssid, bool qos) |
388 | { | |
389 | struct ieee80211_hdr hdr; | |
390 | u16 hdrlen, ethertype; | |
391 | __le16 fc; | |
392 | const u8 *encaps_data; | |
393 | int encaps_len, skip_header_bytes; | |
394 | int nh_pos, h_pos; | |
395 | int head_need; | |
396 | ||
397 | if (unlikely(skb->len < ETH_HLEN)) | |
398 | return -EINVAL; | |
399 | ||
400 | nh_pos = skb_network_header(skb) - skb->data; | |
401 | h_pos = skb_transport_header(skb) - skb->data; | |
402 | ||
403 | /* convert Ethernet header to proper 802.11 header (based on | |
404 | * operation mode) */ | |
405 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
406 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); | |
407 | ||
408 | switch (iftype) { | |
409 | case NL80211_IFTYPE_AP: | |
410 | case NL80211_IFTYPE_AP_VLAN: | |
411 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); | |
412 | /* DA BSSID SA */ | |
413 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
414 | memcpy(hdr.addr2, addr, ETH_ALEN); | |
415 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
416 | hdrlen = 24; | |
417 | break; | |
418 | case NL80211_IFTYPE_STATION: | |
419 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); | |
420 | /* BSSID SA DA */ | |
421 | memcpy(hdr.addr1, bssid, ETH_ALEN); | |
422 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
423 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
424 | hdrlen = 24; | |
425 | break; | |
426 | case NL80211_IFTYPE_ADHOC: | |
427 | /* DA SA BSSID */ | |
428 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
429 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
430 | memcpy(hdr.addr3, bssid, ETH_ALEN); | |
431 | hdrlen = 24; | |
432 | break; | |
433 | default: | |
434 | return -EOPNOTSUPP; | |
435 | } | |
436 | ||
437 | if (qos) { | |
438 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
439 | hdrlen += 2; | |
440 | } | |
441 | ||
442 | hdr.frame_control = fc; | |
443 | hdr.duration_id = 0; | |
444 | hdr.seq_ctrl = 0; | |
445 | ||
446 | skip_header_bytes = ETH_HLEN; | |
447 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
448 | encaps_data = bridge_tunnel_header; | |
449 | encaps_len = sizeof(bridge_tunnel_header); | |
450 | skip_header_bytes -= 2; | |
451 | } else if (ethertype > 0x600) { | |
452 | encaps_data = rfc1042_header; | |
453 | encaps_len = sizeof(rfc1042_header); | |
454 | skip_header_bytes -= 2; | |
455 | } else { | |
456 | encaps_data = NULL; | |
457 | encaps_len = 0; | |
458 | } | |
459 | ||
460 | skb_pull(skb, skip_header_bytes); | |
461 | nh_pos -= skip_header_bytes; | |
462 | h_pos -= skip_header_bytes; | |
463 | ||
464 | head_need = hdrlen + encaps_len - skb_headroom(skb); | |
465 | ||
466 | if (head_need > 0 || skb_cloned(skb)) { | |
467 | head_need = max(head_need, 0); | |
468 | if (head_need) | |
469 | skb_orphan(skb); | |
470 | ||
471 | if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) { | |
472 | printk(KERN_ERR "failed to reallocate Tx buffer\n"); | |
473 | return -ENOMEM; | |
474 | } | |
475 | skb->truesize += head_need; | |
476 | } | |
477 | ||
478 | if (encaps_data) { | |
479 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
480 | nh_pos += encaps_len; | |
481 | h_pos += encaps_len; | |
482 | } | |
483 | ||
484 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
485 | ||
486 | nh_pos += hdrlen; | |
487 | h_pos += hdrlen; | |
488 | ||
489 | /* Update skb pointers to various headers since this modified frame | |
490 | * is going to go through Linux networking code that may potentially | |
491 | * need things like pointer to IP header. */ | |
492 | skb_set_mac_header(skb, 0); | |
493 | skb_set_network_header(skb, nh_pos); | |
494 | skb_set_transport_header(skb, h_pos); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | EXPORT_SYMBOL(ieee80211_data_from_8023); | |
499 | ||
eaf85ca7 ZY |
500 | |
501 | void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, | |
502 | const u8 *addr, enum nl80211_iftype iftype, | |
503 | const unsigned int extra_headroom) | |
504 | { | |
505 | struct sk_buff *frame = NULL; | |
506 | u16 ethertype; | |
507 | u8 *payload; | |
508 | const struct ethhdr *eth; | |
509 | int remaining, err; | |
510 | u8 dst[ETH_ALEN], src[ETH_ALEN]; | |
511 | ||
512 | err = ieee80211_data_to_8023(skb, addr, iftype); | |
513 | if (err) | |
514 | goto out; | |
515 | ||
516 | /* skip the wrapping header */ | |
517 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
518 | if (!eth) | |
519 | goto out; | |
520 | ||
521 | while (skb != frame) { | |
522 | u8 padding; | |
523 | __be16 len = eth->h_proto; | |
524 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
525 | ||
526 | remaining = skb->len; | |
527 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
528 | memcpy(src, eth->h_source, ETH_ALEN); | |
529 | ||
530 | padding = (4 - subframe_len) & 0x3; | |
531 | /* the last MSDU has no padding */ | |
532 | if (subframe_len > remaining) | |
533 | goto purge; | |
534 | ||
535 | skb_pull(skb, sizeof(struct ethhdr)); | |
536 | /* reuse skb for the last subframe */ | |
537 | if (remaining <= subframe_len + padding) | |
538 | frame = skb; | |
539 | else { | |
540 | unsigned int hlen = ALIGN(extra_headroom, 4); | |
541 | /* | |
542 | * Allocate and reserve two bytes more for payload | |
543 | * alignment since sizeof(struct ethhdr) is 14. | |
544 | */ | |
545 | frame = dev_alloc_skb(hlen + subframe_len + 2); | |
546 | if (!frame) | |
547 | goto purge; | |
548 | ||
549 | skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); | |
550 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
551 | ntohs(len)); | |
552 | ||
553 | eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + | |
554 | padding); | |
555 | if (!eth) { | |
556 | dev_kfree_skb(frame); | |
557 | goto purge; | |
558 | } | |
559 | } | |
560 | ||
561 | skb_reset_network_header(frame); | |
562 | frame->dev = skb->dev; | |
563 | frame->priority = skb->priority; | |
564 | ||
565 | payload = frame->data; | |
566 | ethertype = (payload[6] << 8) | payload[7]; | |
567 | ||
568 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
569 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
570 | compare_ether_addr(payload, | |
571 | bridge_tunnel_header) == 0)) { | |
572 | /* remove RFC1042 or Bridge-Tunnel | |
573 | * encapsulation and replace EtherType */ | |
574 | skb_pull(frame, 6); | |
575 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
576 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
577 | } else { | |
578 | memcpy(skb_push(frame, sizeof(__be16)), &len, | |
579 | sizeof(__be16)); | |
580 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
581 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
582 | } | |
583 | __skb_queue_tail(list, frame); | |
584 | } | |
585 | ||
586 | return; | |
587 | ||
588 | purge: | |
589 | __skb_queue_purge(list); | |
590 | out: | |
591 | dev_kfree_skb(skb); | |
592 | } | |
593 | EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); | |
594 | ||
e31a16d6 ZY |
595 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
596 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) | |
597 | { | |
598 | unsigned int dscp; | |
599 | ||
600 | /* skb->priority values from 256->263 are magic values to | |
601 | * directly indicate a specific 802.1d priority. This is used | |
602 | * to allow 802.1d priority to be passed directly in from VLAN | |
603 | * tags, etc. | |
604 | */ | |
605 | if (skb->priority >= 256 && skb->priority <= 263) | |
606 | return skb->priority - 256; | |
607 | ||
608 | switch (skb->protocol) { | |
609 | case htons(ETH_P_IP): | |
610 | dscp = ip_hdr(skb)->tos & 0xfc; | |
611 | break; | |
612 | default: | |
613 | return 0; | |
614 | } | |
615 | ||
616 | return dscp >> 5; | |
617 | } | |
618 | EXPORT_SYMBOL(cfg80211_classify8021d); | |
517357c6 JB |
619 | |
620 | const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) | |
621 | { | |
622 | u8 *end, *pos; | |
623 | ||
624 | pos = bss->information_elements; | |
625 | if (pos == NULL) | |
626 | return NULL; | |
627 | end = pos + bss->len_information_elements; | |
628 | ||
629 | while (pos + 1 < end) { | |
630 | if (pos + 2 + pos[1] > end) | |
631 | break; | |
632 | if (pos[0] == ie) | |
633 | return pos; | |
634 | pos += 2 + pos[1]; | |
635 | } | |
636 | ||
637 | return NULL; | |
638 | } | |
639 | EXPORT_SYMBOL(ieee80211_bss_get_ie); | |
fffd0934 JB |
640 | |
641 | void cfg80211_upload_connect_keys(struct wireless_dev *wdev) | |
642 | { | |
643 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); | |
644 | struct net_device *dev = wdev->netdev; | |
645 | int i; | |
646 | ||
647 | if (!wdev->connect_keys) | |
648 | return; | |
649 | ||
650 | for (i = 0; i < 6; i++) { | |
651 | if (!wdev->connect_keys->params[i].cipher) | |
652 | continue; | |
653 | if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL, | |
1e056665 | 654 | &wdev->connect_keys->params[i])) { |
fffd0934 JB |
655 | printk(KERN_ERR "%s: failed to set key %d\n", |
656 | dev->name, i); | |
1e056665 ZY |
657 | continue; |
658 | } | |
fffd0934 | 659 | if (wdev->connect_keys->def == i) |
1e056665 | 660 | if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) { |
fffd0934 JB |
661 | printk(KERN_ERR "%s: failed to set defkey %d\n", |
662 | dev->name, i); | |
1e056665 ZY |
663 | continue; |
664 | } | |
fffd0934 JB |
665 | if (wdev->connect_keys->defmgmt == i) |
666 | if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i)) | |
667 | printk(KERN_ERR "%s: failed to set mgtdef %d\n", | |
668 | dev->name, i); | |
669 | } | |
670 | ||
671 | kfree(wdev->connect_keys); | |
672 | wdev->connect_keys = NULL; | |
673 | } | |
3d54d255 JB |
674 | |
675 | static void cfg80211_process_wdev_events(struct wireless_dev *wdev) | |
676 | { | |
677 | struct cfg80211_event *ev; | |
678 | unsigned long flags; | |
679 | const u8 *bssid = NULL; | |
680 | ||
681 | spin_lock_irqsave(&wdev->event_lock, flags); | |
682 | while (!list_empty(&wdev->event_list)) { | |
683 | ev = list_first_entry(&wdev->event_list, | |
684 | struct cfg80211_event, list); | |
685 | list_del(&ev->list); | |
686 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
687 | ||
688 | wdev_lock(wdev); | |
689 | switch (ev->type) { | |
690 | case EVENT_CONNECT_RESULT: | |
691 | if (!is_zero_ether_addr(ev->cr.bssid)) | |
692 | bssid = ev->cr.bssid; | |
693 | __cfg80211_connect_result( | |
694 | wdev->netdev, bssid, | |
695 | ev->cr.req_ie, ev->cr.req_ie_len, | |
696 | ev->cr.resp_ie, ev->cr.resp_ie_len, | |
697 | ev->cr.status, | |
698 | ev->cr.status == WLAN_STATUS_SUCCESS, | |
699 | NULL); | |
700 | break; | |
701 | case EVENT_ROAMED: | |
702 | __cfg80211_roamed(wdev, ev->rm.bssid, | |
703 | ev->rm.req_ie, ev->rm.req_ie_len, | |
704 | ev->rm.resp_ie, ev->rm.resp_ie_len); | |
705 | break; | |
706 | case EVENT_DISCONNECTED: | |
707 | __cfg80211_disconnected(wdev->netdev, | |
708 | ev->dc.ie, ev->dc.ie_len, | |
709 | ev->dc.reason, true); | |
710 | break; | |
711 | case EVENT_IBSS_JOINED: | |
712 | __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); | |
713 | break; | |
714 | } | |
715 | wdev_unlock(wdev); | |
716 | ||
717 | kfree(ev); | |
718 | ||
719 | spin_lock_irqsave(&wdev->event_lock, flags); | |
720 | } | |
721 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
722 | } | |
723 | ||
724 | void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) | |
725 | { | |
726 | struct wireless_dev *wdev; | |
727 | ||
728 | ASSERT_RTNL(); | |
729 | ASSERT_RDEV_LOCK(rdev); | |
730 | ||
731 | mutex_lock(&rdev->devlist_mtx); | |
732 | ||
733 | list_for_each_entry(wdev, &rdev->netdev_list, list) | |
734 | cfg80211_process_wdev_events(wdev); | |
735 | ||
736 | mutex_unlock(&rdev->devlist_mtx); | |
737 | } | |
738 | ||
739 | int cfg80211_change_iface(struct cfg80211_registered_device *rdev, | |
740 | struct net_device *dev, enum nl80211_iftype ntype, | |
741 | u32 *flags, struct vif_params *params) | |
742 | { | |
743 | int err; | |
744 | enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; | |
745 | ||
746 | ASSERT_RDEV_LOCK(rdev); | |
747 | ||
748 | /* don't support changing VLANs, you just re-create them */ | |
749 | if (otype == NL80211_IFTYPE_AP_VLAN) | |
750 | return -EOPNOTSUPP; | |
751 | ||
752 | if (!rdev->ops->change_virtual_intf || | |
753 | !(rdev->wiphy.interface_modes & (1 << ntype))) | |
754 | return -EOPNOTSUPP; | |
755 | ||
ad4bb6f8 JB |
756 | /* if it's part of a bridge, reject changing type to station/ibss */ |
757 | if (dev->br_port && (ntype == NL80211_IFTYPE_ADHOC || | |
758 | ntype == NL80211_IFTYPE_STATION)) | |
759 | return -EBUSY; | |
760 | ||
3d54d255 | 761 | if (ntype != otype) { |
9bc383de JB |
762 | dev->ieee80211_ptr->use_4addr = false; |
763 | ||
3d54d255 JB |
764 | switch (otype) { |
765 | case NL80211_IFTYPE_ADHOC: | |
766 | cfg80211_leave_ibss(rdev, dev, false); | |
767 | break; | |
768 | case NL80211_IFTYPE_STATION: | |
769 | cfg80211_disconnect(rdev, dev, | |
770 | WLAN_REASON_DEAUTH_LEAVING, true); | |
771 | break; | |
772 | case NL80211_IFTYPE_MESH_POINT: | |
773 | /* mesh should be handled? */ | |
774 | break; | |
775 | default: | |
776 | break; | |
777 | } | |
778 | ||
779 | cfg80211_process_rdev_events(rdev); | |
780 | } | |
781 | ||
782 | err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev, | |
783 | ntype, flags, params); | |
784 | ||
785 | WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); | |
786 | ||
9bc383de JB |
787 | if (!err && params && params->use_4addr != -1) |
788 | dev->ieee80211_ptr->use_4addr = params->use_4addr; | |
789 | ||
ad4bb6f8 JB |
790 | if (!err) { |
791 | dev->priv_flags &= ~IFF_DONT_BRIDGE; | |
792 | switch (ntype) { | |
793 | case NL80211_IFTYPE_STATION: | |
794 | if (dev->ieee80211_ptr->use_4addr) | |
795 | break; | |
796 | /* fall through */ | |
797 | case NL80211_IFTYPE_ADHOC: | |
798 | dev->priv_flags |= IFF_DONT_BRIDGE; | |
799 | break; | |
800 | case NL80211_IFTYPE_AP: | |
801 | case NL80211_IFTYPE_AP_VLAN: | |
802 | case NL80211_IFTYPE_WDS: | |
803 | case NL80211_IFTYPE_MESH_POINT: | |
804 | /* bridging OK */ | |
805 | break; | |
806 | case NL80211_IFTYPE_MONITOR: | |
807 | /* monitor can't bridge anyway */ | |
808 | break; | |
809 | case NL80211_IFTYPE_UNSPECIFIED: | |
810 | case __NL80211_IFTYPE_AFTER_LAST: | |
811 | /* not happening */ | |
812 | break; | |
813 | } | |
814 | } | |
815 | ||
3d54d255 JB |
816 | return err; |
817 | } | |
254416aa JL |
818 | |
819 | u16 cfg80211_calculate_bitrate(struct rate_info *rate) | |
820 | { | |
821 | int modulation, streams, bitrate; | |
822 | ||
823 | if (!(rate->flags & RATE_INFO_FLAGS_MCS)) | |
824 | return rate->legacy; | |
825 | ||
826 | /* the formula below does only work for MCS values smaller than 32 */ | |
827 | if (rate->mcs >= 32) | |
828 | return 0; | |
829 | ||
830 | modulation = rate->mcs & 7; | |
831 | streams = (rate->mcs >> 3) + 1; | |
832 | ||
833 | bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ? | |
834 | 13500000 : 6500000; | |
835 | ||
836 | if (modulation < 4) | |
837 | bitrate *= (modulation + 1); | |
838 | else if (modulation == 4) | |
839 | bitrate *= (modulation + 2); | |
840 | else | |
841 | bitrate *= (modulation + 3); | |
842 | ||
843 | bitrate *= streams; | |
844 | ||
845 | if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) | |
846 | bitrate = (bitrate / 9) * 10; | |
847 | ||
848 | /* do NOT round down here */ | |
849 | return (bitrate + 50000) / 100000; | |
850 | } |