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Commit | Line | Data |
---|---|---|
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> |
5a0e3ad6 | 8 | #include <linux/slab.h> |
d3236553 | 9 | #include <net/cfg80211.h> |
e31a16d6 | 10 | #include <net/ip.h> |
8318d78a JB |
11 | #include "core.h" |
12 | ||
bd815252 JB |
13 | struct ieee80211_rate * |
14 | ieee80211_get_response_rate(struct ieee80211_supported_band *sband, | |
881d948c | 15 | u32 basic_rates, int bitrate) |
bd815252 JB |
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 | ||
8318d78a JB |
32 | int ieee80211_channel_to_frequency(int chan) |
33 | { | |
34 | if (chan < 14) | |
35 | return 2407 + chan * 5; | |
36 | ||
37 | if (chan == 14) | |
38 | return 2484; | |
39 | ||
40 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
41 | return (chan + 1000) * 5; | |
42 | } | |
43 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); | |
44 | ||
45 | int ieee80211_frequency_to_channel(int freq) | |
46 | { | |
47 | if (freq == 2484) | |
48 | return 14; | |
49 | ||
50 | if (freq < 2484) | |
51 | return (freq - 2407) / 5; | |
52 | ||
53 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
54 | return freq/5 - 1000; | |
55 | } | |
56 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); | |
57 | ||
6c507cd0 JB |
58 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
59 | int freq) | |
906c730a JB |
60 | { |
61 | enum ieee80211_band band; | |
62 | struct ieee80211_supported_band *sband; | |
63 | int i; | |
64 | ||
65 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
66 | sband = wiphy->bands[band]; | |
67 | ||
68 | if (!sband) | |
69 | continue; | |
70 | ||
71 | for (i = 0; i < sband->n_channels; i++) { | |
72 | if (sband->channels[i].center_freq == freq) | |
73 | return &sband->channels[i]; | |
74 | } | |
75 | } | |
76 | ||
77 | return NULL; | |
78 | } | |
6c507cd0 | 79 | EXPORT_SYMBOL(__ieee80211_get_channel); |
906c730a | 80 | |
8318d78a JB |
81 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
82 | enum ieee80211_band band) | |
83 | { | |
84 | int i, want; | |
85 | ||
86 | switch (band) { | |
87 | case IEEE80211_BAND_5GHZ: | |
88 | want = 3; | |
89 | for (i = 0; i < sband->n_bitrates; i++) { | |
90 | if (sband->bitrates[i].bitrate == 60 || | |
91 | sband->bitrates[i].bitrate == 120 || | |
92 | sband->bitrates[i].bitrate == 240) { | |
93 | sband->bitrates[i].flags |= | |
94 | IEEE80211_RATE_MANDATORY_A; | |
95 | want--; | |
96 | } | |
97 | } | |
98 | WARN_ON(want); | |
99 | break; | |
100 | case IEEE80211_BAND_2GHZ: | |
101 | want = 7; | |
102 | for (i = 0; i < sband->n_bitrates; i++) { | |
103 | if (sband->bitrates[i].bitrate == 10) { | |
104 | sband->bitrates[i].flags |= | |
105 | IEEE80211_RATE_MANDATORY_B | | |
106 | IEEE80211_RATE_MANDATORY_G; | |
107 | want--; | |
108 | } | |
109 | ||
110 | if (sband->bitrates[i].bitrate == 20 || | |
111 | sband->bitrates[i].bitrate == 55 || | |
112 | sband->bitrates[i].bitrate == 110 || | |
113 | sband->bitrates[i].bitrate == 60 || | |
114 | sband->bitrates[i].bitrate == 120 || | |
115 | sband->bitrates[i].bitrate == 240) { | |
116 | sband->bitrates[i].flags |= | |
117 | IEEE80211_RATE_MANDATORY_G; | |
118 | want--; | |
119 | } | |
120 | ||
aac09fbf JB |
121 | if (sband->bitrates[i].bitrate != 10 && |
122 | sband->bitrates[i].bitrate != 20 && | |
123 | sband->bitrates[i].bitrate != 55 && | |
124 | sband->bitrates[i].bitrate != 110) | |
8318d78a JB |
125 | sband->bitrates[i].flags |= |
126 | IEEE80211_RATE_ERP_G; | |
127 | } | |
406f2388 | 128 | WARN_ON(want != 0 && want != 3 && want != 6); |
8318d78a JB |
129 | break; |
130 | case IEEE80211_NUM_BANDS: | |
131 | WARN_ON(1); | |
132 | break; | |
133 | } | |
134 | } | |
135 | ||
136 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) | |
137 | { | |
138 | enum ieee80211_band band; | |
139 | ||
140 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
141 | if (wiphy->bands[band]) | |
142 | set_mandatory_flags_band(wiphy->bands[band], band); | |
143 | } | |
08645126 | 144 | |
fffd0934 JB |
145 | int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, |
146 | struct key_params *params, int key_idx, | |
08645126 JB |
147 | const u8 *mac_addr) |
148 | { | |
fffd0934 JB |
149 | int i; |
150 | ||
08645126 JB |
151 | if (key_idx > 5) |
152 | return -EINVAL; | |
153 | ||
154 | /* | |
155 | * Disallow pairwise keys with non-zero index unless it's WEP | |
156 | * (because current deployments use pairwise WEP keys with | |
157 | * non-zero indizes but 802.11i clearly specifies to use zero) | |
158 | */ | |
159 | if (mac_addr && key_idx && | |
160 | params->cipher != WLAN_CIPHER_SUITE_WEP40 && | |
161 | params->cipher != WLAN_CIPHER_SUITE_WEP104) | |
162 | return -EINVAL; | |
163 | ||
08645126 JB |
164 | switch (params->cipher) { |
165 | case WLAN_CIPHER_SUITE_WEP40: | |
8fc0fee0 | 166 | if (params->key_len != WLAN_KEY_LEN_WEP40) |
08645126 JB |
167 | return -EINVAL; |
168 | break; | |
169 | case WLAN_CIPHER_SUITE_TKIP: | |
8fc0fee0 | 170 | if (params->key_len != WLAN_KEY_LEN_TKIP) |
08645126 JB |
171 | return -EINVAL; |
172 | break; | |
173 | case WLAN_CIPHER_SUITE_CCMP: | |
8fc0fee0 | 174 | if (params->key_len != WLAN_KEY_LEN_CCMP) |
08645126 JB |
175 | return -EINVAL; |
176 | break; | |
177 | case WLAN_CIPHER_SUITE_WEP104: | |
8fc0fee0 | 178 | if (params->key_len != WLAN_KEY_LEN_WEP104) |
08645126 JB |
179 | return -EINVAL; |
180 | break; | |
181 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
8fc0fee0 | 182 | if (params->key_len != WLAN_KEY_LEN_AES_CMAC) |
08645126 JB |
183 | return -EINVAL; |
184 | break; | |
185 | default: | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
9f26a952 JM |
189 | if (params->seq) { |
190 | switch (params->cipher) { | |
191 | case WLAN_CIPHER_SUITE_WEP40: | |
192 | case WLAN_CIPHER_SUITE_WEP104: | |
193 | /* These ciphers do not use key sequence */ | |
194 | return -EINVAL; | |
195 | case WLAN_CIPHER_SUITE_TKIP: | |
196 | case WLAN_CIPHER_SUITE_CCMP: | |
197 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
198 | if (params->seq_len != 6) | |
199 | return -EINVAL; | |
200 | break; | |
201 | } | |
202 | } | |
203 | ||
fffd0934 JB |
204 | for (i = 0; i < rdev->wiphy.n_cipher_suites; i++) |
205 | if (params->cipher == rdev->wiphy.cipher_suites[i]) | |
206 | break; | |
207 | if (i == rdev->wiphy.n_cipher_suites) | |
208 | return -EINVAL; | |
209 | ||
08645126 JB |
210 | return 0; |
211 | } | |
e31a16d6 ZY |
212 | |
213 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
214 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
215 | const unsigned char rfc1042_header[] __aligned(2) = | |
216 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
217 | EXPORT_SYMBOL(rfc1042_header); | |
218 | ||
219 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
220 | const unsigned char bridge_tunnel_header[] __aligned(2) = | |
221 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
222 | EXPORT_SYMBOL(bridge_tunnel_header); | |
223 | ||
224 | unsigned int ieee80211_hdrlen(__le16 fc) | |
225 | { | |
226 | unsigned int hdrlen = 24; | |
227 | ||
228 | if (ieee80211_is_data(fc)) { | |
229 | if (ieee80211_has_a4(fc)) | |
230 | hdrlen = 30; | |
d0dd2de0 | 231 | if (ieee80211_is_data_qos(fc)) { |
e31a16d6 | 232 | hdrlen += IEEE80211_QOS_CTL_LEN; |
d0dd2de0 AT |
233 | if (ieee80211_has_order(fc)) |
234 | hdrlen += IEEE80211_HT_CTL_LEN; | |
235 | } | |
e31a16d6 ZY |
236 | goto out; |
237 | } | |
238 | ||
239 | if (ieee80211_is_ctl(fc)) { | |
240 | /* | |
241 | * ACK and CTS are 10 bytes, all others 16. To see how | |
242 | * to get this condition consider | |
243 | * subtype mask: 0b0000000011110000 (0x00F0) | |
244 | * ACK subtype: 0b0000000011010000 (0x00D0) | |
245 | * CTS subtype: 0b0000000011000000 (0x00C0) | |
246 | * bits that matter: ^^^ (0x00E0) | |
247 | * value of those: 0b0000000011000000 (0x00C0) | |
248 | */ | |
249 | if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) | |
250 | hdrlen = 10; | |
251 | else | |
252 | hdrlen = 16; | |
253 | } | |
254 | out: | |
255 | return hdrlen; | |
256 | } | |
257 | EXPORT_SYMBOL(ieee80211_hdrlen); | |
258 | ||
259 | unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) | |
260 | { | |
261 | const struct ieee80211_hdr *hdr = | |
262 | (const struct ieee80211_hdr *)skb->data; | |
263 | unsigned int hdrlen; | |
264 | ||
265 | if (unlikely(skb->len < 10)) | |
266 | return 0; | |
267 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
268 | if (unlikely(hdrlen > skb->len)) | |
269 | return 0; | |
270 | return hdrlen; | |
271 | } | |
272 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); | |
273 | ||
60fd2b67 | 274 | static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) |
e31a16d6 ZY |
275 | { |
276 | int ae = meshhdr->flags & MESH_FLAGS_AE; | |
277 | /* 7.1.3.5a.2 */ | |
278 | switch (ae) { | |
279 | case 0: | |
280 | return 6; | |
3c5772a5 | 281 | case MESH_FLAGS_AE_A4: |
e31a16d6 | 282 | return 12; |
3c5772a5 | 283 | case MESH_FLAGS_AE_A5_A6: |
e31a16d6 | 284 | return 18; |
3c5772a5 | 285 | case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): |
e31a16d6 ZY |
286 | return 24; |
287 | default: | |
288 | return 6; | |
289 | } | |
290 | } | |
291 | ||
eaf85ca7 | 292 | int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
293 | enum nl80211_iftype iftype) |
294 | { | |
295 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
296 | u16 hdrlen, ethertype; | |
297 | u8 *payload; | |
298 | u8 dst[ETH_ALEN]; | |
299 | u8 src[ETH_ALEN] __aligned(2); | |
300 | ||
301 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) | |
302 | return -1; | |
303 | ||
304 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
305 | ||
306 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
307 | * header | |
308 | * IEEE 802.11 address fields: | |
309 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
310 | * 0 0 DA SA BSSID n/a | |
311 | * 0 1 DA BSSID SA n/a | |
312 | * 1 0 BSSID SA DA n/a | |
313 | * 1 1 RA TA DA SA | |
314 | */ | |
315 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); | |
316 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
317 | ||
318 | switch (hdr->frame_control & | |
319 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
320 | case cpu_to_le16(IEEE80211_FCTL_TODS): | |
321 | if (unlikely(iftype != NL80211_IFTYPE_AP && | |
322 | iftype != NL80211_IFTYPE_AP_VLAN)) | |
323 | return -1; | |
324 | break; | |
325 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
326 | if (unlikely(iftype != NL80211_IFTYPE_WDS && | |
f14543ee FF |
327 | iftype != NL80211_IFTYPE_MESH_POINT && |
328 | iftype != NL80211_IFTYPE_AP_VLAN && | |
329 | iftype != NL80211_IFTYPE_STATION)) | |
e31a16d6 ZY |
330 | return -1; |
331 | if (iftype == NL80211_IFTYPE_MESH_POINT) { | |
332 | struct ieee80211s_hdr *meshdr = | |
333 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
334 | /* make sure meshdr->flags is on the linear part */ |
335 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
336 | return -1; | |
e31a16d6 | 337 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { |
e3cf8b3f ZY |
338 | skb_copy_bits(skb, hdrlen + |
339 | offsetof(struct ieee80211s_hdr, eaddr1), | |
340 | dst, ETH_ALEN); | |
341 | skb_copy_bits(skb, hdrlen + | |
342 | offsetof(struct ieee80211s_hdr, eaddr2), | |
343 | src, ETH_ALEN); | |
e31a16d6 | 344 | } |
e3cf8b3f | 345 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); |
e31a16d6 ZY |
346 | } |
347 | break; | |
348 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): | |
3c5772a5 JC |
349 | if ((iftype != NL80211_IFTYPE_STATION && |
350 | iftype != NL80211_IFTYPE_MESH_POINT) || | |
e31a16d6 ZY |
351 | (is_multicast_ether_addr(dst) && |
352 | !compare_ether_addr(src, addr))) | |
353 | return -1; | |
3c5772a5 JC |
354 | if (iftype == NL80211_IFTYPE_MESH_POINT) { |
355 | struct ieee80211s_hdr *meshdr = | |
356 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
357 | /* make sure meshdr->flags is on the linear part */ |
358 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
359 | return -1; | |
3c5772a5 | 360 | if (meshdr->flags & MESH_FLAGS_AE_A4) |
e3cf8b3f ZY |
361 | skb_copy_bits(skb, hdrlen + |
362 | offsetof(struct ieee80211s_hdr, eaddr1), | |
363 | src, ETH_ALEN); | |
364 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
3c5772a5 | 365 | } |
e31a16d6 ZY |
366 | break; |
367 | case cpu_to_le16(0): | |
368 | if (iftype != NL80211_IFTYPE_ADHOC) | |
369 | return -1; | |
370 | break; | |
371 | } | |
372 | ||
e3cf8b3f | 373 | if (!pskb_may_pull(skb, hdrlen + 8)) |
e31a16d6 ZY |
374 | return -1; |
375 | ||
376 | payload = skb->data + hdrlen; | |
377 | ethertype = (payload[6] << 8) | payload[7]; | |
378 | ||
379 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
380 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
381 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
382 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
383 | * replace EtherType */ | |
384 | skb_pull(skb, hdrlen + 6); | |
385 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
386 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
387 | } else { | |
388 | struct ethhdr *ehdr; | |
389 | __be16 len; | |
390 | ||
391 | skb_pull(skb, hdrlen); | |
392 | len = htons(skb->len); | |
393 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
394 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
395 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
396 | ehdr->h_proto = len; | |
397 | } | |
398 | return 0; | |
399 | } | |
400 | EXPORT_SYMBOL(ieee80211_data_to_8023); | |
401 | ||
eaf85ca7 | 402 | int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
403 | enum nl80211_iftype iftype, u8 *bssid, bool qos) |
404 | { | |
405 | struct ieee80211_hdr hdr; | |
406 | u16 hdrlen, ethertype; | |
407 | __le16 fc; | |
408 | const u8 *encaps_data; | |
409 | int encaps_len, skip_header_bytes; | |
410 | int nh_pos, h_pos; | |
411 | int head_need; | |
412 | ||
413 | if (unlikely(skb->len < ETH_HLEN)) | |
414 | return -EINVAL; | |
415 | ||
416 | nh_pos = skb_network_header(skb) - skb->data; | |
417 | h_pos = skb_transport_header(skb) - skb->data; | |
418 | ||
419 | /* convert Ethernet header to proper 802.11 header (based on | |
420 | * operation mode) */ | |
421 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
422 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); | |
423 | ||
424 | switch (iftype) { | |
425 | case NL80211_IFTYPE_AP: | |
426 | case NL80211_IFTYPE_AP_VLAN: | |
427 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); | |
428 | /* DA BSSID SA */ | |
429 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
430 | memcpy(hdr.addr2, addr, ETH_ALEN); | |
431 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
432 | hdrlen = 24; | |
433 | break; | |
434 | case NL80211_IFTYPE_STATION: | |
435 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); | |
436 | /* BSSID SA DA */ | |
437 | memcpy(hdr.addr1, bssid, ETH_ALEN); | |
438 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
439 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
440 | hdrlen = 24; | |
441 | break; | |
442 | case NL80211_IFTYPE_ADHOC: | |
443 | /* DA SA BSSID */ | |
444 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
445 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
446 | memcpy(hdr.addr3, bssid, ETH_ALEN); | |
447 | hdrlen = 24; | |
448 | break; | |
449 | default: | |
450 | return -EOPNOTSUPP; | |
451 | } | |
452 | ||
453 | if (qos) { | |
454 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
455 | hdrlen += 2; | |
456 | } | |
457 | ||
458 | hdr.frame_control = fc; | |
459 | hdr.duration_id = 0; | |
460 | hdr.seq_ctrl = 0; | |
461 | ||
462 | skip_header_bytes = ETH_HLEN; | |
463 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
464 | encaps_data = bridge_tunnel_header; | |
465 | encaps_len = sizeof(bridge_tunnel_header); | |
466 | skip_header_bytes -= 2; | |
467 | } else if (ethertype > 0x600) { | |
468 | encaps_data = rfc1042_header; | |
469 | encaps_len = sizeof(rfc1042_header); | |
470 | skip_header_bytes -= 2; | |
471 | } else { | |
472 | encaps_data = NULL; | |
473 | encaps_len = 0; | |
474 | } | |
475 | ||
476 | skb_pull(skb, skip_header_bytes); | |
477 | nh_pos -= skip_header_bytes; | |
478 | h_pos -= skip_header_bytes; | |
479 | ||
480 | head_need = hdrlen + encaps_len - skb_headroom(skb); | |
481 | ||
482 | if (head_need > 0 || skb_cloned(skb)) { | |
483 | head_need = max(head_need, 0); | |
484 | if (head_need) | |
485 | skb_orphan(skb); | |
486 | ||
487 | if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) { | |
488 | printk(KERN_ERR "failed to reallocate Tx buffer\n"); | |
489 | return -ENOMEM; | |
490 | } | |
491 | skb->truesize += head_need; | |
492 | } | |
493 | ||
494 | if (encaps_data) { | |
495 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
496 | nh_pos += encaps_len; | |
497 | h_pos += encaps_len; | |
498 | } | |
499 | ||
500 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
501 | ||
502 | nh_pos += hdrlen; | |
503 | h_pos += hdrlen; | |
504 | ||
505 | /* Update skb pointers to various headers since this modified frame | |
506 | * is going to go through Linux networking code that may potentially | |
507 | * need things like pointer to IP header. */ | |
508 | skb_set_mac_header(skb, 0); | |
509 | skb_set_network_header(skb, nh_pos); | |
510 | skb_set_transport_header(skb, h_pos); | |
511 | ||
512 | return 0; | |
513 | } | |
514 | EXPORT_SYMBOL(ieee80211_data_from_8023); | |
515 | ||
eaf85ca7 ZY |
516 | |
517 | void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, | |
518 | const u8 *addr, enum nl80211_iftype iftype, | |
519 | const unsigned int extra_headroom) | |
520 | { | |
521 | struct sk_buff *frame = NULL; | |
522 | u16 ethertype; | |
523 | u8 *payload; | |
524 | const struct ethhdr *eth; | |
525 | int remaining, err; | |
526 | u8 dst[ETH_ALEN], src[ETH_ALEN]; | |
527 | ||
528 | err = ieee80211_data_to_8023(skb, addr, iftype); | |
529 | if (err) | |
530 | goto out; | |
531 | ||
532 | /* skip the wrapping header */ | |
533 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
534 | if (!eth) | |
535 | goto out; | |
536 | ||
537 | while (skb != frame) { | |
538 | u8 padding; | |
539 | __be16 len = eth->h_proto; | |
540 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
541 | ||
542 | remaining = skb->len; | |
543 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
544 | memcpy(src, eth->h_source, ETH_ALEN); | |
545 | ||
546 | padding = (4 - subframe_len) & 0x3; | |
547 | /* the last MSDU has no padding */ | |
548 | if (subframe_len > remaining) | |
549 | goto purge; | |
550 | ||
551 | skb_pull(skb, sizeof(struct ethhdr)); | |
552 | /* reuse skb for the last subframe */ | |
553 | if (remaining <= subframe_len + padding) | |
554 | frame = skb; | |
555 | else { | |
556 | unsigned int hlen = ALIGN(extra_headroom, 4); | |
557 | /* | |
558 | * Allocate and reserve two bytes more for payload | |
559 | * alignment since sizeof(struct ethhdr) is 14. | |
560 | */ | |
561 | frame = dev_alloc_skb(hlen + subframe_len + 2); | |
562 | if (!frame) | |
563 | goto purge; | |
564 | ||
565 | skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); | |
566 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
567 | ntohs(len)); | |
568 | ||
569 | eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + | |
570 | padding); | |
571 | if (!eth) { | |
572 | dev_kfree_skb(frame); | |
573 | goto purge; | |
574 | } | |
575 | } | |
576 | ||
577 | skb_reset_network_header(frame); | |
578 | frame->dev = skb->dev; | |
579 | frame->priority = skb->priority; | |
580 | ||
581 | payload = frame->data; | |
582 | ethertype = (payload[6] << 8) | payload[7]; | |
583 | ||
584 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
585 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
586 | compare_ether_addr(payload, | |
587 | bridge_tunnel_header) == 0)) { | |
588 | /* remove RFC1042 or Bridge-Tunnel | |
589 | * encapsulation and replace EtherType */ | |
590 | skb_pull(frame, 6); | |
591 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
592 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
593 | } else { | |
594 | memcpy(skb_push(frame, sizeof(__be16)), &len, | |
595 | sizeof(__be16)); | |
596 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
597 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
598 | } | |
599 | __skb_queue_tail(list, frame); | |
600 | } | |
601 | ||
602 | return; | |
603 | ||
604 | purge: | |
605 | __skb_queue_purge(list); | |
606 | out: | |
607 | dev_kfree_skb(skb); | |
608 | } | |
609 | EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); | |
610 | ||
e31a16d6 ZY |
611 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
612 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) | |
613 | { | |
614 | unsigned int dscp; | |
615 | ||
616 | /* skb->priority values from 256->263 are magic values to | |
617 | * directly indicate a specific 802.1d priority. This is used | |
618 | * to allow 802.1d priority to be passed directly in from VLAN | |
619 | * tags, etc. | |
620 | */ | |
621 | if (skb->priority >= 256 && skb->priority <= 263) | |
622 | return skb->priority - 256; | |
623 | ||
624 | switch (skb->protocol) { | |
625 | case htons(ETH_P_IP): | |
626 | dscp = ip_hdr(skb)->tos & 0xfc; | |
627 | break; | |
628 | default: | |
629 | return 0; | |
630 | } | |
631 | ||
632 | return dscp >> 5; | |
633 | } | |
634 | EXPORT_SYMBOL(cfg80211_classify8021d); | |
517357c6 JB |
635 | |
636 | const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) | |
637 | { | |
638 | u8 *end, *pos; | |
639 | ||
640 | pos = bss->information_elements; | |
641 | if (pos == NULL) | |
642 | return NULL; | |
643 | end = pos + bss->len_information_elements; | |
644 | ||
645 | while (pos + 1 < end) { | |
646 | if (pos + 2 + pos[1] > end) | |
647 | break; | |
648 | if (pos[0] == ie) | |
649 | return pos; | |
650 | pos += 2 + pos[1]; | |
651 | } | |
652 | ||
653 | return NULL; | |
654 | } | |
655 | EXPORT_SYMBOL(ieee80211_bss_get_ie); | |
fffd0934 JB |
656 | |
657 | void cfg80211_upload_connect_keys(struct wireless_dev *wdev) | |
658 | { | |
659 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); | |
660 | struct net_device *dev = wdev->netdev; | |
661 | int i; | |
662 | ||
663 | if (!wdev->connect_keys) | |
664 | return; | |
665 | ||
666 | for (i = 0; i < 6; i++) { | |
667 | if (!wdev->connect_keys->params[i].cipher) | |
668 | continue; | |
669 | if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL, | |
1e056665 | 670 | &wdev->connect_keys->params[i])) { |
fffd0934 JB |
671 | printk(KERN_ERR "%s: failed to set key %d\n", |
672 | dev->name, i); | |
1e056665 ZY |
673 | continue; |
674 | } | |
fffd0934 | 675 | if (wdev->connect_keys->def == i) |
1e056665 | 676 | if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) { |
fffd0934 JB |
677 | printk(KERN_ERR "%s: failed to set defkey %d\n", |
678 | dev->name, i); | |
1e056665 ZY |
679 | continue; |
680 | } | |
fffd0934 JB |
681 | if (wdev->connect_keys->defmgmt == i) |
682 | if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i)) | |
683 | printk(KERN_ERR "%s: failed to set mgtdef %d\n", | |
684 | dev->name, i); | |
685 | } | |
686 | ||
687 | kfree(wdev->connect_keys); | |
688 | wdev->connect_keys = NULL; | |
689 | } | |
3d54d255 JB |
690 | |
691 | static void cfg80211_process_wdev_events(struct wireless_dev *wdev) | |
692 | { | |
693 | struct cfg80211_event *ev; | |
694 | unsigned long flags; | |
695 | const u8 *bssid = NULL; | |
696 | ||
697 | spin_lock_irqsave(&wdev->event_lock, flags); | |
698 | while (!list_empty(&wdev->event_list)) { | |
699 | ev = list_first_entry(&wdev->event_list, | |
700 | struct cfg80211_event, list); | |
701 | list_del(&ev->list); | |
702 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
703 | ||
704 | wdev_lock(wdev); | |
705 | switch (ev->type) { | |
706 | case EVENT_CONNECT_RESULT: | |
707 | if (!is_zero_ether_addr(ev->cr.bssid)) | |
708 | bssid = ev->cr.bssid; | |
709 | __cfg80211_connect_result( | |
710 | wdev->netdev, bssid, | |
711 | ev->cr.req_ie, ev->cr.req_ie_len, | |
712 | ev->cr.resp_ie, ev->cr.resp_ie_len, | |
713 | ev->cr.status, | |
714 | ev->cr.status == WLAN_STATUS_SUCCESS, | |
715 | NULL); | |
716 | break; | |
717 | case EVENT_ROAMED: | |
718 | __cfg80211_roamed(wdev, ev->rm.bssid, | |
719 | ev->rm.req_ie, ev->rm.req_ie_len, | |
720 | ev->rm.resp_ie, ev->rm.resp_ie_len); | |
721 | break; | |
722 | case EVENT_DISCONNECTED: | |
723 | __cfg80211_disconnected(wdev->netdev, | |
724 | ev->dc.ie, ev->dc.ie_len, | |
725 | ev->dc.reason, true); | |
726 | break; | |
727 | case EVENT_IBSS_JOINED: | |
728 | __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); | |
729 | break; | |
730 | } | |
731 | wdev_unlock(wdev); | |
732 | ||
733 | kfree(ev); | |
734 | ||
735 | spin_lock_irqsave(&wdev->event_lock, flags); | |
736 | } | |
737 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
738 | } | |
739 | ||
740 | void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) | |
741 | { | |
742 | struct wireless_dev *wdev; | |
743 | ||
744 | ASSERT_RTNL(); | |
745 | ASSERT_RDEV_LOCK(rdev); | |
746 | ||
747 | mutex_lock(&rdev->devlist_mtx); | |
748 | ||
749 | list_for_each_entry(wdev, &rdev->netdev_list, list) | |
750 | cfg80211_process_wdev_events(wdev); | |
751 | ||
752 | mutex_unlock(&rdev->devlist_mtx); | |
753 | } | |
754 | ||
755 | int cfg80211_change_iface(struct cfg80211_registered_device *rdev, | |
756 | struct net_device *dev, enum nl80211_iftype ntype, | |
757 | u32 *flags, struct vif_params *params) | |
758 | { | |
759 | int err; | |
760 | enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; | |
761 | ||
762 | ASSERT_RDEV_LOCK(rdev); | |
763 | ||
764 | /* don't support changing VLANs, you just re-create them */ | |
765 | if (otype == NL80211_IFTYPE_AP_VLAN) | |
766 | return -EOPNOTSUPP; | |
767 | ||
768 | if (!rdev->ops->change_virtual_intf || | |
769 | !(rdev->wiphy.interface_modes & (1 << ntype))) | |
770 | return -EOPNOTSUPP; | |
771 | ||
ad4bb6f8 | 772 | /* if it's part of a bridge, reject changing type to station/ibss */ |
f350a0a8 JP |
773 | if ((dev->priv_flags & IFF_BRIDGE_PORT) && |
774 | (ntype == NL80211_IFTYPE_ADHOC || ntype == NL80211_IFTYPE_STATION)) | |
ad4bb6f8 JB |
775 | return -EBUSY; |
776 | ||
3d54d255 | 777 | if (ntype != otype) { |
9bc383de JB |
778 | dev->ieee80211_ptr->use_4addr = false; |
779 | ||
3d54d255 JB |
780 | switch (otype) { |
781 | case NL80211_IFTYPE_ADHOC: | |
782 | cfg80211_leave_ibss(rdev, dev, false); | |
783 | break; | |
784 | case NL80211_IFTYPE_STATION: | |
785 | cfg80211_disconnect(rdev, dev, | |
786 | WLAN_REASON_DEAUTH_LEAVING, true); | |
787 | break; | |
788 | case NL80211_IFTYPE_MESH_POINT: | |
789 | /* mesh should be handled? */ | |
790 | break; | |
791 | default: | |
792 | break; | |
793 | } | |
794 | ||
795 | cfg80211_process_rdev_events(rdev); | |
796 | } | |
797 | ||
798 | err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev, | |
799 | ntype, flags, params); | |
800 | ||
801 | WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); | |
802 | ||
9bc383de JB |
803 | if (!err && params && params->use_4addr != -1) |
804 | dev->ieee80211_ptr->use_4addr = params->use_4addr; | |
805 | ||
ad4bb6f8 JB |
806 | if (!err) { |
807 | dev->priv_flags &= ~IFF_DONT_BRIDGE; | |
808 | switch (ntype) { | |
809 | case NL80211_IFTYPE_STATION: | |
810 | if (dev->ieee80211_ptr->use_4addr) | |
811 | break; | |
812 | /* fall through */ | |
813 | case NL80211_IFTYPE_ADHOC: | |
814 | dev->priv_flags |= IFF_DONT_BRIDGE; | |
815 | break; | |
816 | case NL80211_IFTYPE_AP: | |
817 | case NL80211_IFTYPE_AP_VLAN: | |
818 | case NL80211_IFTYPE_WDS: | |
819 | case NL80211_IFTYPE_MESH_POINT: | |
820 | /* bridging OK */ | |
821 | break; | |
822 | case NL80211_IFTYPE_MONITOR: | |
823 | /* monitor can't bridge anyway */ | |
824 | break; | |
825 | case NL80211_IFTYPE_UNSPECIFIED: | |
826 | case __NL80211_IFTYPE_AFTER_LAST: | |
827 | /* not happening */ | |
828 | break; | |
829 | } | |
830 | } | |
831 | ||
3d54d255 JB |
832 | return err; |
833 | } | |
254416aa JL |
834 | |
835 | u16 cfg80211_calculate_bitrate(struct rate_info *rate) | |
836 | { | |
837 | int modulation, streams, bitrate; | |
838 | ||
839 | if (!(rate->flags & RATE_INFO_FLAGS_MCS)) | |
840 | return rate->legacy; | |
841 | ||
842 | /* the formula below does only work for MCS values smaller than 32 */ | |
843 | if (rate->mcs >= 32) | |
844 | return 0; | |
845 | ||
846 | modulation = rate->mcs & 7; | |
847 | streams = (rate->mcs >> 3) + 1; | |
848 | ||
849 | bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ? | |
850 | 13500000 : 6500000; | |
851 | ||
852 | if (modulation < 4) | |
853 | bitrate *= (modulation + 1); | |
854 | else if (modulation == 4) | |
855 | bitrate *= (modulation + 2); | |
856 | else | |
857 | bitrate *= (modulation + 3); | |
858 | ||
859 | bitrate *= streams; | |
860 | ||
861 | if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) | |
862 | bitrate = (bitrate / 9) * 10; | |
863 | ||
864 | /* do NOT round down here */ | |
865 | return (bitrate + 50000) / 100000; | |
866 | } |