Commit | Line | Data |
---|---|---|
8318d78a JB |
1 | /* |
2 | * Wireless utility functions | |
3 | * | |
d3236553 | 4 | * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> |
8318d78a | 5 | */ |
bc3b2d7f | 6 | #include <linux/export.h> |
d3236553 | 7 | #include <linux/bitops.h> |
e31a16d6 | 8 | #include <linux/etherdevice.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
d3236553 | 10 | #include <net/cfg80211.h> |
e31a16d6 | 11 | #include <net/ip.h> |
b156579b | 12 | #include <net/dsfield.h> |
8318d78a JB |
13 | #include "core.h" |
14 | ||
bd815252 JB |
15 | struct ieee80211_rate * |
16 | ieee80211_get_response_rate(struct ieee80211_supported_band *sband, | |
881d948c | 17 | u32 basic_rates, int bitrate) |
bd815252 JB |
18 | { |
19 | struct ieee80211_rate *result = &sband->bitrates[0]; | |
20 | int i; | |
21 | ||
22 | for (i = 0; i < sband->n_bitrates; i++) { | |
23 | if (!(basic_rates & BIT(i))) | |
24 | continue; | |
25 | if (sband->bitrates[i].bitrate > bitrate) | |
26 | continue; | |
27 | result = &sband->bitrates[i]; | |
28 | } | |
29 | ||
30 | return result; | |
31 | } | |
32 | EXPORT_SYMBOL(ieee80211_get_response_rate); | |
33 | ||
59eb21a6 | 34 | int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band) |
8318d78a | 35 | { |
59eb21a6 BR |
36 | /* see 802.11 17.3.8.3.2 and Annex J |
37 | * there are overlapping channel numbers in 5GHz and 2GHz bands */ | |
38 | if (band == IEEE80211_BAND_5GHZ) { | |
39 | if (chan >= 182 && chan <= 196) | |
40 | return 4000 + chan * 5; | |
41 | else | |
42 | return 5000 + chan * 5; | |
43 | } else { /* IEEE80211_BAND_2GHZ */ | |
44 | if (chan == 14) | |
45 | return 2484; | |
46 | else if (chan < 14) | |
47 | return 2407 + chan * 5; | |
48 | else | |
49 | return 0; /* not supported */ | |
50 | } | |
8318d78a JB |
51 | } |
52 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); | |
53 | ||
54 | int ieee80211_frequency_to_channel(int freq) | |
55 | { | |
59eb21a6 | 56 | /* see 802.11 17.3.8.3.2 and Annex J */ |
8318d78a JB |
57 | if (freq == 2484) |
58 | return 14; | |
59eb21a6 | 59 | else if (freq < 2484) |
8318d78a | 60 | return (freq - 2407) / 5; |
59eb21a6 BR |
61 | else if (freq >= 4910 && freq <= 4980) |
62 | return (freq - 4000) / 5; | |
63 | else | |
64 | return (freq - 5000) / 5; | |
8318d78a JB |
65 | } |
66 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); | |
67 | ||
6c507cd0 JB |
68 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
69 | int freq) | |
906c730a JB |
70 | { |
71 | enum ieee80211_band band; | |
72 | struct ieee80211_supported_band *sband; | |
73 | int i; | |
74 | ||
75 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
76 | sband = wiphy->bands[band]; | |
77 | ||
78 | if (!sband) | |
79 | continue; | |
80 | ||
81 | for (i = 0; i < sband->n_channels; i++) { | |
82 | if (sband->channels[i].center_freq == freq) | |
83 | return &sband->channels[i]; | |
84 | } | |
85 | } | |
86 | ||
87 | return NULL; | |
88 | } | |
6c507cd0 | 89 | EXPORT_SYMBOL(__ieee80211_get_channel); |
906c730a | 90 | |
8318d78a JB |
91 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
92 | enum ieee80211_band band) | |
93 | { | |
94 | int i, want; | |
95 | ||
96 | switch (band) { | |
97 | case IEEE80211_BAND_5GHZ: | |
98 | want = 3; | |
99 | for (i = 0; i < sband->n_bitrates; i++) { | |
100 | if (sband->bitrates[i].bitrate == 60 || | |
101 | sband->bitrates[i].bitrate == 120 || | |
102 | sband->bitrates[i].bitrate == 240) { | |
103 | sband->bitrates[i].flags |= | |
104 | IEEE80211_RATE_MANDATORY_A; | |
105 | want--; | |
106 | } | |
107 | } | |
108 | WARN_ON(want); | |
109 | break; | |
110 | case IEEE80211_BAND_2GHZ: | |
111 | want = 7; | |
112 | for (i = 0; i < sband->n_bitrates; i++) { | |
113 | if (sband->bitrates[i].bitrate == 10) { | |
114 | sband->bitrates[i].flags |= | |
115 | IEEE80211_RATE_MANDATORY_B | | |
116 | IEEE80211_RATE_MANDATORY_G; | |
117 | want--; | |
118 | } | |
119 | ||
120 | if (sband->bitrates[i].bitrate == 20 || | |
121 | sband->bitrates[i].bitrate == 55 || | |
122 | sband->bitrates[i].bitrate == 110 || | |
123 | sband->bitrates[i].bitrate == 60 || | |
124 | sband->bitrates[i].bitrate == 120 || | |
125 | sband->bitrates[i].bitrate == 240) { | |
126 | sband->bitrates[i].flags |= | |
127 | IEEE80211_RATE_MANDATORY_G; | |
128 | want--; | |
129 | } | |
130 | ||
aac09fbf JB |
131 | if (sband->bitrates[i].bitrate != 10 && |
132 | sband->bitrates[i].bitrate != 20 && | |
133 | sband->bitrates[i].bitrate != 55 && | |
134 | sband->bitrates[i].bitrate != 110) | |
8318d78a JB |
135 | sband->bitrates[i].flags |= |
136 | IEEE80211_RATE_ERP_G; | |
137 | } | |
406f2388 | 138 | WARN_ON(want != 0 && want != 3 && want != 6); |
8318d78a JB |
139 | break; |
140 | case IEEE80211_NUM_BANDS: | |
141 | WARN_ON(1); | |
142 | break; | |
143 | } | |
144 | } | |
145 | ||
146 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) | |
147 | { | |
148 | enum ieee80211_band band; | |
149 | ||
150 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
151 | if (wiphy->bands[band]) | |
152 | set_mandatory_flags_band(wiphy->bands[band], band); | |
153 | } | |
08645126 | 154 | |
38ba3c57 JM |
155 | bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher) |
156 | { | |
157 | int i; | |
158 | for (i = 0; i < wiphy->n_cipher_suites; i++) | |
159 | if (cipher == wiphy->cipher_suites[i]) | |
160 | return true; | |
161 | return false; | |
162 | } | |
163 | ||
fffd0934 JB |
164 | int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, |
165 | struct key_params *params, int key_idx, | |
e31b8213 | 166 | bool pairwise, const u8 *mac_addr) |
08645126 JB |
167 | { |
168 | if (key_idx > 5) | |
169 | return -EINVAL; | |
170 | ||
e31b8213 JB |
171 | if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)) |
172 | return -EINVAL; | |
173 | ||
174 | if (pairwise && !mac_addr) | |
175 | return -EINVAL; | |
176 | ||
08645126 JB |
177 | /* |
178 | * Disallow pairwise keys with non-zero index unless it's WEP | |
45cbad6a JO |
179 | * or a vendor specific cipher (because current deployments use |
180 | * pairwise WEP keys with non-zero indices and for vendor specific | |
181 | * ciphers this should be validated in the driver or hardware level | |
182 | * - but 802.11i clearly specifies to use zero) | |
08645126 | 183 | */ |
e31b8213 | 184 | if (pairwise && key_idx && |
45cbad6a JO |
185 | ((params->cipher == WLAN_CIPHER_SUITE_TKIP) || |
186 | (params->cipher == WLAN_CIPHER_SUITE_CCMP) || | |
187 | (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC))) | |
08645126 JB |
188 | return -EINVAL; |
189 | ||
08645126 JB |
190 | switch (params->cipher) { |
191 | case WLAN_CIPHER_SUITE_WEP40: | |
8fc0fee0 | 192 | if (params->key_len != WLAN_KEY_LEN_WEP40) |
08645126 JB |
193 | return -EINVAL; |
194 | break; | |
195 | case WLAN_CIPHER_SUITE_TKIP: | |
8fc0fee0 | 196 | if (params->key_len != WLAN_KEY_LEN_TKIP) |
08645126 JB |
197 | return -EINVAL; |
198 | break; | |
199 | case WLAN_CIPHER_SUITE_CCMP: | |
8fc0fee0 | 200 | if (params->key_len != WLAN_KEY_LEN_CCMP) |
08645126 JB |
201 | return -EINVAL; |
202 | break; | |
203 | case WLAN_CIPHER_SUITE_WEP104: | |
8fc0fee0 | 204 | if (params->key_len != WLAN_KEY_LEN_WEP104) |
08645126 JB |
205 | return -EINVAL; |
206 | break; | |
207 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
8fc0fee0 | 208 | if (params->key_len != WLAN_KEY_LEN_AES_CMAC) |
08645126 JB |
209 | return -EINVAL; |
210 | break; | |
211 | default: | |
7d64b7cc JB |
212 | /* |
213 | * We don't know anything about this algorithm, | |
214 | * allow using it -- but the driver must check | |
215 | * all parameters! We still check below whether | |
216 | * or not the driver supports this algorithm, | |
217 | * of course. | |
218 | */ | |
219 | break; | |
08645126 JB |
220 | } |
221 | ||
9f26a952 JM |
222 | if (params->seq) { |
223 | switch (params->cipher) { | |
224 | case WLAN_CIPHER_SUITE_WEP40: | |
225 | case WLAN_CIPHER_SUITE_WEP104: | |
226 | /* These ciphers do not use key sequence */ | |
227 | return -EINVAL; | |
228 | case WLAN_CIPHER_SUITE_TKIP: | |
229 | case WLAN_CIPHER_SUITE_CCMP: | |
230 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
231 | if (params->seq_len != 6) | |
232 | return -EINVAL; | |
233 | break; | |
234 | } | |
235 | } | |
236 | ||
38ba3c57 | 237 | if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher)) |
fffd0934 JB |
238 | return -EINVAL; |
239 | ||
08645126 JB |
240 | return 0; |
241 | } | |
e31a16d6 | 242 | |
633adf1a | 243 | unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc) |
e31a16d6 ZY |
244 | { |
245 | unsigned int hdrlen = 24; | |
246 | ||
247 | if (ieee80211_is_data(fc)) { | |
248 | if (ieee80211_has_a4(fc)) | |
249 | hdrlen = 30; | |
d0dd2de0 | 250 | if (ieee80211_is_data_qos(fc)) { |
e31a16d6 | 251 | hdrlen += IEEE80211_QOS_CTL_LEN; |
d0dd2de0 AT |
252 | if (ieee80211_has_order(fc)) |
253 | hdrlen += IEEE80211_HT_CTL_LEN; | |
254 | } | |
e31a16d6 ZY |
255 | goto out; |
256 | } | |
257 | ||
258 | if (ieee80211_is_ctl(fc)) { | |
259 | /* | |
260 | * ACK and CTS are 10 bytes, all others 16. To see how | |
261 | * to get this condition consider | |
262 | * subtype mask: 0b0000000011110000 (0x00F0) | |
263 | * ACK subtype: 0b0000000011010000 (0x00D0) | |
264 | * CTS subtype: 0b0000000011000000 (0x00C0) | |
265 | * bits that matter: ^^^ (0x00E0) | |
266 | * value of those: 0b0000000011000000 (0x00C0) | |
267 | */ | |
268 | if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) | |
269 | hdrlen = 10; | |
270 | else | |
271 | hdrlen = 16; | |
272 | } | |
273 | out: | |
274 | return hdrlen; | |
275 | } | |
276 | EXPORT_SYMBOL(ieee80211_hdrlen); | |
277 | ||
278 | unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) | |
279 | { | |
280 | const struct ieee80211_hdr *hdr = | |
281 | (const struct ieee80211_hdr *)skb->data; | |
282 | unsigned int hdrlen; | |
283 | ||
284 | if (unlikely(skb->len < 10)) | |
285 | return 0; | |
286 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
287 | if (unlikely(hdrlen > skb->len)) | |
288 | return 0; | |
289 | return hdrlen; | |
290 | } | |
291 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); | |
292 | ||
60fd2b67 | 293 | static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) |
e31a16d6 ZY |
294 | { |
295 | int ae = meshhdr->flags & MESH_FLAGS_AE; | |
296 | /* 7.1.3.5a.2 */ | |
297 | switch (ae) { | |
298 | case 0: | |
299 | return 6; | |
3c5772a5 | 300 | case MESH_FLAGS_AE_A4: |
e31a16d6 | 301 | return 12; |
3c5772a5 | 302 | case MESH_FLAGS_AE_A5_A6: |
e31a16d6 | 303 | return 18; |
3c5772a5 | 304 | case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): |
e31a16d6 ZY |
305 | return 24; |
306 | default: | |
307 | return 6; | |
308 | } | |
309 | } | |
310 | ||
eaf85ca7 | 311 | int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
312 | enum nl80211_iftype iftype) |
313 | { | |
314 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
315 | u16 hdrlen, ethertype; | |
316 | u8 *payload; | |
317 | u8 dst[ETH_ALEN]; | |
318 | u8 src[ETH_ALEN] __aligned(2); | |
319 | ||
320 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) | |
321 | return -1; | |
322 | ||
323 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
324 | ||
325 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
326 | * header | |
327 | * IEEE 802.11 address fields: | |
328 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
329 | * 0 0 DA SA BSSID n/a | |
330 | * 0 1 DA BSSID SA n/a | |
331 | * 1 0 BSSID SA DA n/a | |
332 | * 1 1 RA TA DA SA | |
333 | */ | |
334 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); | |
335 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
336 | ||
337 | switch (hdr->frame_control & | |
338 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
339 | case cpu_to_le16(IEEE80211_FCTL_TODS): | |
340 | if (unlikely(iftype != NL80211_IFTYPE_AP && | |
074ac8df JB |
341 | iftype != NL80211_IFTYPE_AP_VLAN && |
342 | iftype != NL80211_IFTYPE_P2P_GO)) | |
e31a16d6 ZY |
343 | return -1; |
344 | break; | |
345 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
346 | if (unlikely(iftype != NL80211_IFTYPE_WDS && | |
f14543ee FF |
347 | iftype != NL80211_IFTYPE_MESH_POINT && |
348 | iftype != NL80211_IFTYPE_AP_VLAN && | |
349 | iftype != NL80211_IFTYPE_STATION)) | |
e31a16d6 ZY |
350 | return -1; |
351 | if (iftype == NL80211_IFTYPE_MESH_POINT) { | |
352 | struct ieee80211s_hdr *meshdr = | |
353 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
354 | /* make sure meshdr->flags is on the linear part */ |
355 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
356 | return -1; | |
e31a16d6 | 357 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { |
e3cf8b3f ZY |
358 | skb_copy_bits(skb, hdrlen + |
359 | offsetof(struct ieee80211s_hdr, eaddr1), | |
360 | dst, ETH_ALEN); | |
361 | skb_copy_bits(skb, hdrlen + | |
362 | offsetof(struct ieee80211s_hdr, eaddr2), | |
363 | src, ETH_ALEN); | |
e31a16d6 | 364 | } |
e3cf8b3f | 365 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); |
e31a16d6 ZY |
366 | } |
367 | break; | |
368 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): | |
3c5772a5 | 369 | if ((iftype != NL80211_IFTYPE_STATION && |
074ac8df JB |
370 | iftype != NL80211_IFTYPE_P2P_CLIENT && |
371 | iftype != NL80211_IFTYPE_MESH_POINT) || | |
e31a16d6 | 372 | (is_multicast_ether_addr(dst) && |
4c764729 | 373 | ether_addr_equal(src, addr))) |
e31a16d6 | 374 | return -1; |
3c5772a5 JC |
375 | if (iftype == NL80211_IFTYPE_MESH_POINT) { |
376 | struct ieee80211s_hdr *meshdr = | |
377 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
378 | /* make sure meshdr->flags is on the linear part */ |
379 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
380 | return -1; | |
3c5772a5 | 381 | if (meshdr->flags & MESH_FLAGS_AE_A4) |
e3cf8b3f ZY |
382 | skb_copy_bits(skb, hdrlen + |
383 | offsetof(struct ieee80211s_hdr, eaddr1), | |
384 | src, ETH_ALEN); | |
385 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
3c5772a5 | 386 | } |
e31a16d6 ZY |
387 | break; |
388 | case cpu_to_le16(0): | |
941c93cd AN |
389 | if (iftype != NL80211_IFTYPE_ADHOC && |
390 | iftype != NL80211_IFTYPE_STATION) | |
391 | return -1; | |
e31a16d6 ZY |
392 | break; |
393 | } | |
394 | ||
e3cf8b3f | 395 | if (!pskb_may_pull(skb, hdrlen + 8)) |
e31a16d6 ZY |
396 | return -1; |
397 | ||
398 | payload = skb->data + hdrlen; | |
399 | ethertype = (payload[6] << 8) | payload[7]; | |
400 | ||
4c764729 | 401 | if (likely((ether_addr_equal(payload, rfc1042_header) && |
e31a16d6 | 402 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
4c764729 | 403 | ether_addr_equal(payload, bridge_tunnel_header))) { |
e31a16d6 ZY |
404 | /* remove RFC1042 or Bridge-Tunnel encapsulation and |
405 | * replace EtherType */ | |
406 | skb_pull(skb, hdrlen + 6); | |
407 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
408 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
409 | } else { | |
410 | struct ethhdr *ehdr; | |
411 | __be16 len; | |
412 | ||
413 | skb_pull(skb, hdrlen); | |
414 | len = htons(skb->len); | |
415 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
416 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
417 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
418 | ehdr->h_proto = len; | |
419 | } | |
420 | return 0; | |
421 | } | |
422 | EXPORT_SYMBOL(ieee80211_data_to_8023); | |
423 | ||
eaf85ca7 | 424 | int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
425 | enum nl80211_iftype iftype, u8 *bssid, bool qos) |
426 | { | |
427 | struct ieee80211_hdr hdr; | |
428 | u16 hdrlen, ethertype; | |
429 | __le16 fc; | |
430 | const u8 *encaps_data; | |
431 | int encaps_len, skip_header_bytes; | |
432 | int nh_pos, h_pos; | |
433 | int head_need; | |
434 | ||
435 | if (unlikely(skb->len < ETH_HLEN)) | |
436 | return -EINVAL; | |
437 | ||
438 | nh_pos = skb_network_header(skb) - skb->data; | |
439 | h_pos = skb_transport_header(skb) - skb->data; | |
440 | ||
441 | /* convert Ethernet header to proper 802.11 header (based on | |
442 | * operation mode) */ | |
443 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
444 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); | |
445 | ||
446 | switch (iftype) { | |
447 | case NL80211_IFTYPE_AP: | |
448 | case NL80211_IFTYPE_AP_VLAN: | |
074ac8df | 449 | case NL80211_IFTYPE_P2P_GO: |
e31a16d6 ZY |
450 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
451 | /* DA BSSID SA */ | |
452 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
453 | memcpy(hdr.addr2, addr, ETH_ALEN); | |
454 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
455 | hdrlen = 24; | |
456 | break; | |
457 | case NL80211_IFTYPE_STATION: | |
074ac8df | 458 | case NL80211_IFTYPE_P2P_CLIENT: |
e31a16d6 ZY |
459 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
460 | /* BSSID SA DA */ | |
461 | memcpy(hdr.addr1, bssid, ETH_ALEN); | |
462 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
463 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
464 | hdrlen = 24; | |
465 | break; | |
466 | case NL80211_IFTYPE_ADHOC: | |
467 | /* DA SA BSSID */ | |
468 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
469 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
470 | memcpy(hdr.addr3, bssid, ETH_ALEN); | |
471 | hdrlen = 24; | |
472 | break; | |
473 | default: | |
474 | return -EOPNOTSUPP; | |
475 | } | |
476 | ||
477 | if (qos) { | |
478 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
479 | hdrlen += 2; | |
480 | } | |
481 | ||
482 | hdr.frame_control = fc; | |
483 | hdr.duration_id = 0; | |
484 | hdr.seq_ctrl = 0; | |
485 | ||
486 | skip_header_bytes = ETH_HLEN; | |
487 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
488 | encaps_data = bridge_tunnel_header; | |
489 | encaps_len = sizeof(bridge_tunnel_header); | |
490 | skip_header_bytes -= 2; | |
491 | } else if (ethertype > 0x600) { | |
492 | encaps_data = rfc1042_header; | |
493 | encaps_len = sizeof(rfc1042_header); | |
494 | skip_header_bytes -= 2; | |
495 | } else { | |
496 | encaps_data = NULL; | |
497 | encaps_len = 0; | |
498 | } | |
499 | ||
500 | skb_pull(skb, skip_header_bytes); | |
501 | nh_pos -= skip_header_bytes; | |
502 | h_pos -= skip_header_bytes; | |
503 | ||
504 | head_need = hdrlen + encaps_len - skb_headroom(skb); | |
505 | ||
506 | if (head_need > 0 || skb_cloned(skb)) { | |
507 | head_need = max(head_need, 0); | |
508 | if (head_need) | |
509 | skb_orphan(skb); | |
510 | ||
24616152 | 511 | if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) |
e31a16d6 | 512 | return -ENOMEM; |
24616152 | 513 | |
e31a16d6 ZY |
514 | skb->truesize += head_need; |
515 | } | |
516 | ||
517 | if (encaps_data) { | |
518 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
519 | nh_pos += encaps_len; | |
520 | h_pos += encaps_len; | |
521 | } | |
522 | ||
523 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
524 | ||
525 | nh_pos += hdrlen; | |
526 | h_pos += hdrlen; | |
527 | ||
528 | /* Update skb pointers to various headers since this modified frame | |
529 | * is going to go through Linux networking code that may potentially | |
530 | * need things like pointer to IP header. */ | |
531 | skb_set_mac_header(skb, 0); | |
532 | skb_set_network_header(skb, nh_pos); | |
533 | skb_set_transport_header(skb, h_pos); | |
534 | ||
535 | return 0; | |
536 | } | |
537 | EXPORT_SYMBOL(ieee80211_data_from_8023); | |
538 | ||
eaf85ca7 ZY |
539 | |
540 | void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, | |
541 | const u8 *addr, enum nl80211_iftype iftype, | |
8b3becad YAP |
542 | const unsigned int extra_headroom, |
543 | bool has_80211_header) | |
eaf85ca7 ZY |
544 | { |
545 | struct sk_buff *frame = NULL; | |
546 | u16 ethertype; | |
547 | u8 *payload; | |
548 | const struct ethhdr *eth; | |
549 | int remaining, err; | |
550 | u8 dst[ETH_ALEN], src[ETH_ALEN]; | |
551 | ||
8b3becad YAP |
552 | if (has_80211_header) { |
553 | err = ieee80211_data_to_8023(skb, addr, iftype); | |
554 | if (err) | |
555 | goto out; | |
eaf85ca7 | 556 | |
8b3becad YAP |
557 | /* skip the wrapping header */ |
558 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
559 | if (!eth) | |
560 | goto out; | |
561 | } else { | |
562 | eth = (struct ethhdr *) skb->data; | |
563 | } | |
eaf85ca7 ZY |
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 | ||
ac422d3c | 612 | if (likely((ether_addr_equal(payload, rfc1042_header) && |
eaf85ca7 | 613 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
ac422d3c | 614 | ether_addr_equal(payload, bridge_tunnel_header))) { |
eaf85ca7 ZY |
615 | /* remove RFC1042 or Bridge-Tunnel |
616 | * encapsulation and replace EtherType */ | |
617 | skb_pull(frame, 6); | |
618 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
619 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
620 | } else { | |
621 | memcpy(skb_push(frame, sizeof(__be16)), &len, | |
622 | sizeof(__be16)); | |
623 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
624 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
625 | } | |
626 | __skb_queue_tail(list, frame); | |
627 | } | |
628 | ||
629 | return; | |
630 | ||
631 | purge: | |
632 | __skb_queue_purge(list); | |
633 | out: | |
634 | dev_kfree_skb(skb); | |
635 | } | |
636 | EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); | |
637 | ||
e31a16d6 ZY |
638 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
639 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) | |
640 | { | |
641 | unsigned int dscp; | |
642 | ||
643 | /* skb->priority values from 256->263 are magic values to | |
644 | * directly indicate a specific 802.1d priority. This is used | |
645 | * to allow 802.1d priority to be passed directly in from VLAN | |
646 | * tags, etc. | |
647 | */ | |
648 | if (skb->priority >= 256 && skb->priority <= 263) | |
649 | return skb->priority - 256; | |
650 | ||
651 | switch (skb->protocol) { | |
652 | case htons(ETH_P_IP): | |
b156579b DT |
653 | dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc; |
654 | break; | |
655 | case htons(ETH_P_IPV6): | |
656 | dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc; | |
e31a16d6 ZY |
657 | break; |
658 | default: | |
659 | return 0; | |
660 | } | |
661 | ||
662 | return dscp >> 5; | |
663 | } | |
664 | EXPORT_SYMBOL(cfg80211_classify8021d); | |
517357c6 JB |
665 | |
666 | const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) | |
667 | { | |
668 | u8 *end, *pos; | |
669 | ||
670 | pos = bss->information_elements; | |
671 | if (pos == NULL) | |
672 | return NULL; | |
673 | end = pos + bss->len_information_elements; | |
674 | ||
675 | while (pos + 1 < end) { | |
676 | if (pos + 2 + pos[1] > end) | |
677 | break; | |
678 | if (pos[0] == ie) | |
679 | return pos; | |
680 | pos += 2 + pos[1]; | |
681 | } | |
682 | ||
683 | return NULL; | |
684 | } | |
685 | EXPORT_SYMBOL(ieee80211_bss_get_ie); | |
fffd0934 JB |
686 | |
687 | void cfg80211_upload_connect_keys(struct wireless_dev *wdev) | |
688 | { | |
689 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); | |
690 | struct net_device *dev = wdev->netdev; | |
691 | int i; | |
692 | ||
693 | if (!wdev->connect_keys) | |
694 | return; | |
695 | ||
696 | for (i = 0; i < 6; i++) { | |
697 | if (!wdev->connect_keys->params[i].cipher) | |
698 | continue; | |
e31b8213 | 699 | if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL, |
1e056665 | 700 | &wdev->connect_keys->params[i])) { |
e9c0268f | 701 | netdev_err(dev, "failed to set key %d\n", i); |
1e056665 ZY |
702 | continue; |
703 | } | |
fffd0934 | 704 | if (wdev->connect_keys->def == i) |
dbd2fd65 JB |
705 | if (rdev->ops->set_default_key(wdev->wiphy, dev, |
706 | i, true, true)) { | |
e9c0268f | 707 | netdev_err(dev, "failed to set defkey %d\n", i); |
1e056665 ZY |
708 | continue; |
709 | } | |
fffd0934 JB |
710 | if (wdev->connect_keys->defmgmt == i) |
711 | if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i)) | |
e9c0268f | 712 | netdev_err(dev, "failed to set mgtdef %d\n", i); |
fffd0934 JB |
713 | } |
714 | ||
715 | kfree(wdev->connect_keys); | |
716 | wdev->connect_keys = NULL; | |
717 | } | |
3d54d255 JB |
718 | |
719 | static void cfg80211_process_wdev_events(struct wireless_dev *wdev) | |
720 | { | |
721 | struct cfg80211_event *ev; | |
722 | unsigned long flags; | |
723 | const u8 *bssid = NULL; | |
724 | ||
725 | spin_lock_irqsave(&wdev->event_lock, flags); | |
726 | while (!list_empty(&wdev->event_list)) { | |
727 | ev = list_first_entry(&wdev->event_list, | |
728 | struct cfg80211_event, list); | |
729 | list_del(&ev->list); | |
730 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
731 | ||
732 | wdev_lock(wdev); | |
733 | switch (ev->type) { | |
734 | case EVENT_CONNECT_RESULT: | |
735 | if (!is_zero_ether_addr(ev->cr.bssid)) | |
736 | bssid = ev->cr.bssid; | |
737 | __cfg80211_connect_result( | |
738 | wdev->netdev, bssid, | |
739 | ev->cr.req_ie, ev->cr.req_ie_len, | |
740 | ev->cr.resp_ie, ev->cr.resp_ie_len, | |
741 | ev->cr.status, | |
742 | ev->cr.status == WLAN_STATUS_SUCCESS, | |
743 | NULL); | |
744 | break; | |
745 | case EVENT_ROAMED: | |
adbde344 VT |
746 | __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie, |
747 | ev->rm.req_ie_len, ev->rm.resp_ie, | |
748 | ev->rm.resp_ie_len); | |
3d54d255 JB |
749 | break; |
750 | case EVENT_DISCONNECTED: | |
751 | __cfg80211_disconnected(wdev->netdev, | |
752 | ev->dc.ie, ev->dc.ie_len, | |
753 | ev->dc.reason, true); | |
754 | break; | |
755 | case EVENT_IBSS_JOINED: | |
756 | __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); | |
757 | break; | |
758 | } | |
759 | wdev_unlock(wdev); | |
760 | ||
761 | kfree(ev); | |
762 | ||
763 | spin_lock_irqsave(&wdev->event_lock, flags); | |
764 | } | |
765 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
766 | } | |
767 | ||
768 | void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) | |
769 | { | |
770 | struct wireless_dev *wdev; | |
771 | ||
772 | ASSERT_RTNL(); | |
773 | ASSERT_RDEV_LOCK(rdev); | |
774 | ||
775 | mutex_lock(&rdev->devlist_mtx); | |
776 | ||
777 | list_for_each_entry(wdev, &rdev->netdev_list, list) | |
778 | cfg80211_process_wdev_events(wdev); | |
779 | ||
780 | mutex_unlock(&rdev->devlist_mtx); | |
781 | } | |
782 | ||
783 | int cfg80211_change_iface(struct cfg80211_registered_device *rdev, | |
784 | struct net_device *dev, enum nl80211_iftype ntype, | |
785 | u32 *flags, struct vif_params *params) | |
786 | { | |
787 | int err; | |
788 | enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; | |
789 | ||
790 | ASSERT_RDEV_LOCK(rdev); | |
791 | ||
792 | /* don't support changing VLANs, you just re-create them */ | |
793 | if (otype == NL80211_IFTYPE_AP_VLAN) | |
794 | return -EOPNOTSUPP; | |
795 | ||
796 | if (!rdev->ops->change_virtual_intf || | |
797 | !(rdev->wiphy.interface_modes & (1 << ntype))) | |
798 | return -EOPNOTSUPP; | |
799 | ||
ad4bb6f8 | 800 | /* if it's part of a bridge, reject changing type to station/ibss */ |
f350a0a8 | 801 | if ((dev->priv_flags & IFF_BRIDGE_PORT) && |
074ac8df JB |
802 | (ntype == NL80211_IFTYPE_ADHOC || |
803 | ntype == NL80211_IFTYPE_STATION || | |
804 | ntype == NL80211_IFTYPE_P2P_CLIENT)) | |
ad4bb6f8 JB |
805 | return -EBUSY; |
806 | ||
f8cdddb8 | 807 | if (ntype != otype && netif_running(dev)) { |
7527a782 JB |
808 | err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr, |
809 | ntype); | |
810 | if (err) | |
811 | return err; | |
812 | ||
9bc383de | 813 | dev->ieee80211_ptr->use_4addr = false; |
29cbe68c | 814 | dev->ieee80211_ptr->mesh_id_up_len = 0; |
9bc383de | 815 | |
3d54d255 | 816 | switch (otype) { |
ac800140 MK |
817 | case NL80211_IFTYPE_AP: |
818 | cfg80211_stop_ap(rdev, dev); | |
819 | break; | |
3d54d255 JB |
820 | case NL80211_IFTYPE_ADHOC: |
821 | cfg80211_leave_ibss(rdev, dev, false); | |
822 | break; | |
823 | case NL80211_IFTYPE_STATION: | |
074ac8df | 824 | case NL80211_IFTYPE_P2P_CLIENT: |
3d54d255 JB |
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 | ||
9bc383de JB |
843 | if (!err && params && params->use_4addr != -1) |
844 | dev->ieee80211_ptr->use_4addr = params->use_4addr; | |
845 | ||
ad4bb6f8 JB |
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 */ | |
074ac8df | 853 | case NL80211_IFTYPE_P2P_CLIENT: |
ad4bb6f8 JB |
854 | case NL80211_IFTYPE_ADHOC: |
855 | dev->priv_flags |= IFF_DONT_BRIDGE; | |
856 | break; | |
074ac8df | 857 | case NL80211_IFTYPE_P2P_GO: |
ad4bb6f8 JB |
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: | |
2e161f78 | 868 | case NUM_NL80211_IFTYPES: |
ad4bb6f8 JB |
869 | /* not happening */ |
870 | break; | |
871 | } | |
872 | } | |
873 | ||
3d54d255 JB |
874 | return err; |
875 | } | |
254416aa JL |
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 */ | |
2615f375 | 885 | if (WARN_ON_ONCE(rate->mcs >= 32)) |
254416aa JL |
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 | } | |
8097e149 | 909 | EXPORT_SYMBOL(cfg80211_calculate_bitrate); |
56d1893d JB |
910 | |
911 | int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev, | |
912 | u32 beacon_int) | |
913 | { | |
914 | struct wireless_dev *wdev; | |
915 | int res = 0; | |
916 | ||
917 | if (!beacon_int) | |
918 | return -EINVAL; | |
919 | ||
920 | mutex_lock(&rdev->devlist_mtx); | |
921 | ||
922 | list_for_each_entry(wdev, &rdev->netdev_list, list) { | |
923 | if (!wdev->beacon_interval) | |
924 | continue; | |
925 | if (wdev->beacon_interval != beacon_int) { | |
926 | res = -EINVAL; | |
927 | break; | |
928 | } | |
929 | } | |
930 | ||
931 | mutex_unlock(&rdev->devlist_mtx); | |
932 | ||
933 | return res; | |
934 | } | |
7527a782 JB |
935 | |
936 | int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev, | |
937 | struct wireless_dev *wdev, | |
938 | enum nl80211_iftype iftype) | |
939 | { | |
940 | struct wireless_dev *wdev_iter; | |
463454b5 | 941 | u32 used_iftypes = BIT(iftype); |
7527a782 JB |
942 | int num[NUM_NL80211_IFTYPES]; |
943 | int total = 1; | |
944 | int i, j; | |
945 | ||
946 | ASSERT_RTNL(); | |
947 | ||
948 | /* Always allow software iftypes */ | |
949 | if (rdev->wiphy.software_iftypes & BIT(iftype)) | |
950 | return 0; | |
951 | ||
7527a782 JB |
952 | memset(num, 0, sizeof(num)); |
953 | ||
954 | num[iftype] = 1; | |
955 | ||
956 | mutex_lock(&rdev->devlist_mtx); | |
957 | list_for_each_entry(wdev_iter, &rdev->netdev_list, list) { | |
958 | if (wdev_iter == wdev) | |
959 | continue; | |
960 | if (!netif_running(wdev_iter->netdev)) | |
961 | continue; | |
962 | ||
963 | if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype)) | |
964 | continue; | |
965 | ||
966 | num[wdev_iter->iftype]++; | |
967 | total++; | |
463454b5 | 968 | used_iftypes |= BIT(wdev_iter->iftype); |
7527a782 JB |
969 | } |
970 | mutex_unlock(&rdev->devlist_mtx); | |
971 | ||
8e8b41f9 JB |
972 | if (total == 1) |
973 | return 0; | |
974 | ||
7527a782 JB |
975 | for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) { |
976 | const struct ieee80211_iface_combination *c; | |
977 | struct ieee80211_iface_limit *limits; | |
463454b5 | 978 | u32 all_iftypes = 0; |
7527a782 JB |
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++) { | |
463454b5 | 993 | all_iftypes |= limits[j].types; |
e55a4046 | 994 | if (!(limits[j].types & BIT(iftype))) |
7527a782 JB |
995 | continue; |
996 | if (limits[j].max < num[iftype]) | |
997 | goto cont; | |
998 | limits[j].max -= num[iftype]; | |
999 | } | |
1000 | } | |
463454b5 JB |
1001 | |
1002 | /* | |
1003 | * Finally check that all iftypes that we're currently | |
1004 | * using are actually part of this combination. If they | |
1005 | * aren't then we can't use this combination and have | |
1006 | * to continue to the next. | |
1007 | */ | |
1008 | if ((all_iftypes & used_iftypes) != used_iftypes) | |
1009 | goto cont; | |
1010 | ||
1011 | /* | |
1012 | * This combination covered all interface types and | |
1013 | * supported the requested numbers, so we're good. | |
1014 | */ | |
7527a782 JB |
1015 | kfree(limits); |
1016 | return 0; | |
1017 | cont: | |
1018 | kfree(limits); | |
1019 | } | |
1020 | ||
1021 | return -EBUSY; | |
1022 | } | |
34850ab2 JB |
1023 | |
1024 | int ieee80211_get_ratemask(struct ieee80211_supported_band *sband, | |
1025 | const u8 *rates, unsigned int n_rates, | |
1026 | u32 *mask) | |
1027 | { | |
1028 | int i, j; | |
1029 | ||
a401d2bb JB |
1030 | if (!sband) |
1031 | return -EINVAL; | |
1032 | ||
34850ab2 JB |
1033 | if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES) |
1034 | return -EINVAL; | |
1035 | ||
1036 | *mask = 0; | |
1037 | ||
1038 | for (i = 0; i < n_rates; i++) { | |
1039 | int rate = (rates[i] & 0x7f) * 5; | |
1040 | bool found = false; | |
1041 | ||
1042 | for (j = 0; j < sband->n_bitrates; j++) { | |
1043 | if (sband->bitrates[j].bitrate == rate) { | |
1044 | found = true; | |
1045 | *mask |= BIT(j); | |
1046 | break; | |
1047 | } | |
1048 | } | |
1049 | if (!found) | |
1050 | return -EINVAL; | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * mask must have at least one bit set here since we | |
1055 | * didn't accept a 0-length rates array nor allowed | |
1056 | * entries in the array that didn't exist | |
1057 | */ | |
1058 | ||
1059 | return 0; | |
1060 | } | |
11a2a357 JB |
1061 | |
1062 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
1063 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
1064 | const unsigned char rfc1042_header[] __aligned(2) = | |
1065 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
1066 | EXPORT_SYMBOL(rfc1042_header); | |
1067 | ||
1068 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
1069 | const unsigned char bridge_tunnel_header[] __aligned(2) = | |
1070 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
1071 | EXPORT_SYMBOL(bridge_tunnel_header); |