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> |
0879fa44 | 9 | #include <linux/crc32.h> |
d3236553 | 10 | #include <net/cfg80211.h> |
e31a16d6 | 11 | #include <net/ip.h> |
8318d78a JB |
12 | #include "core.h" |
13 | ||
bd815252 JB |
14 | struct ieee80211_rate * |
15 | ieee80211_get_response_rate(struct ieee80211_supported_band *sband, | |
881d948c | 16 | u32 basic_rates, int bitrate) |
bd815252 JB |
17 | { |
18 | struct ieee80211_rate *result = &sband->bitrates[0]; | |
19 | int i; | |
20 | ||
21 | for (i = 0; i < sband->n_bitrates; i++) { | |
22 | if (!(basic_rates & BIT(i))) | |
23 | continue; | |
24 | if (sband->bitrates[i].bitrate > bitrate) | |
25 | continue; | |
26 | result = &sband->bitrates[i]; | |
27 | } | |
28 | ||
29 | return result; | |
30 | } | |
31 | EXPORT_SYMBOL(ieee80211_get_response_rate); | |
32 | ||
59eb21a6 | 33 | int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band) |
8318d78a | 34 | { |
59eb21a6 BR |
35 | /* see 802.11 17.3.8.3.2 and Annex J |
36 | * there are overlapping channel numbers in 5GHz and 2GHz bands */ | |
37 | if (band == IEEE80211_BAND_5GHZ) { | |
38 | if (chan >= 182 && chan <= 196) | |
39 | return 4000 + chan * 5; | |
40 | else | |
41 | return 5000 + chan * 5; | |
42 | } else { /* IEEE80211_BAND_2GHZ */ | |
43 | if (chan == 14) | |
44 | return 2484; | |
45 | else if (chan < 14) | |
46 | return 2407 + chan * 5; | |
47 | else | |
48 | return 0; /* not supported */ | |
49 | } | |
8318d78a JB |
50 | } |
51 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); | |
52 | ||
53 | int ieee80211_frequency_to_channel(int freq) | |
54 | { | |
59eb21a6 | 55 | /* see 802.11 17.3.8.3.2 and Annex J */ |
8318d78a JB |
56 | if (freq == 2484) |
57 | return 14; | |
59eb21a6 | 58 | else if (freq < 2484) |
8318d78a | 59 | return (freq - 2407) / 5; |
59eb21a6 BR |
60 | else if (freq >= 4910 && freq <= 4980) |
61 | return (freq - 4000) / 5; | |
62 | else | |
63 | return (freq - 5000) / 5; | |
8318d78a JB |
64 | } |
65 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); | |
66 | ||
6c507cd0 JB |
67 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
68 | int freq) | |
906c730a JB |
69 | { |
70 | enum ieee80211_band band; | |
71 | struct ieee80211_supported_band *sband; | |
72 | int i; | |
73 | ||
74 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
75 | sband = wiphy->bands[band]; | |
76 | ||
77 | if (!sband) | |
78 | continue; | |
79 | ||
80 | for (i = 0; i < sband->n_channels; i++) { | |
81 | if (sband->channels[i].center_freq == freq) | |
82 | return &sband->channels[i]; | |
83 | } | |
84 | } | |
85 | ||
86 | return NULL; | |
87 | } | |
6c507cd0 | 88 | EXPORT_SYMBOL(__ieee80211_get_channel); |
906c730a | 89 | |
8318d78a JB |
90 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
91 | enum ieee80211_band band) | |
92 | { | |
93 | int i, want; | |
94 | ||
95 | switch (band) { | |
96 | case IEEE80211_BAND_5GHZ: | |
97 | want = 3; | |
98 | for (i = 0; i < sband->n_bitrates; i++) { | |
99 | if (sband->bitrates[i].bitrate == 60 || | |
100 | sband->bitrates[i].bitrate == 120 || | |
101 | sband->bitrates[i].bitrate == 240) { | |
102 | sband->bitrates[i].flags |= | |
103 | IEEE80211_RATE_MANDATORY_A; | |
104 | want--; | |
105 | } | |
106 | } | |
107 | WARN_ON(want); | |
108 | break; | |
109 | case IEEE80211_BAND_2GHZ: | |
110 | want = 7; | |
111 | for (i = 0; i < sband->n_bitrates; i++) { | |
112 | if (sband->bitrates[i].bitrate == 10) { | |
113 | sband->bitrates[i].flags |= | |
114 | IEEE80211_RATE_MANDATORY_B | | |
115 | IEEE80211_RATE_MANDATORY_G; | |
116 | want--; | |
117 | } | |
118 | ||
119 | if (sband->bitrates[i].bitrate == 20 || | |
120 | sband->bitrates[i].bitrate == 55 || | |
121 | sband->bitrates[i].bitrate == 110 || | |
122 | sband->bitrates[i].bitrate == 60 || | |
123 | sband->bitrates[i].bitrate == 120 || | |
124 | sband->bitrates[i].bitrate == 240) { | |
125 | sband->bitrates[i].flags |= | |
126 | IEEE80211_RATE_MANDATORY_G; | |
127 | want--; | |
128 | } | |
129 | ||
aac09fbf JB |
130 | if (sband->bitrates[i].bitrate != 10 && |
131 | sband->bitrates[i].bitrate != 20 && | |
132 | sband->bitrates[i].bitrate != 55 && | |
133 | sband->bitrates[i].bitrate != 110) | |
8318d78a JB |
134 | sband->bitrates[i].flags |= |
135 | IEEE80211_RATE_ERP_G; | |
136 | } | |
406f2388 | 137 | WARN_ON(want != 0 && want != 3 && want != 6); |
8318d78a JB |
138 | break; |
139 | case IEEE80211_NUM_BANDS: | |
140 | WARN_ON(1); | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) | |
146 | { | |
147 | enum ieee80211_band band; | |
148 | ||
149 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
150 | if (wiphy->bands[band]) | |
151 | set_mandatory_flags_band(wiphy->bands[band], band); | |
152 | } | |
08645126 | 153 | |
38ba3c57 JM |
154 | bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher) |
155 | { | |
156 | int i; | |
157 | for (i = 0; i < wiphy->n_cipher_suites; i++) | |
158 | if (cipher == wiphy->cipher_suites[i]) | |
159 | return true; | |
160 | return false; | |
161 | } | |
162 | ||
fffd0934 JB |
163 | int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, |
164 | struct key_params *params, int key_idx, | |
e31b8213 | 165 | bool pairwise, const u8 *mac_addr) |
08645126 JB |
166 | { |
167 | if (key_idx > 5) | |
168 | return -EINVAL; | |
169 | ||
e31b8213 JB |
170 | if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)) |
171 | return -EINVAL; | |
172 | ||
173 | if (pairwise && !mac_addr) | |
174 | return -EINVAL; | |
175 | ||
08645126 JB |
176 | /* |
177 | * Disallow pairwise keys with non-zero index unless it's WEP | |
45cbad6a JO |
178 | * or a vendor specific cipher (because current deployments use |
179 | * pairwise WEP keys with non-zero indices and for vendor specific | |
180 | * ciphers this should be validated in the driver or hardware level | |
181 | * - but 802.11i clearly specifies to use zero) | |
08645126 | 182 | */ |
e31b8213 | 183 | if (pairwise && key_idx && |
45cbad6a JO |
184 | ((params->cipher == WLAN_CIPHER_SUITE_TKIP) || |
185 | (params->cipher == WLAN_CIPHER_SUITE_CCMP) || | |
186 | (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC))) | |
08645126 JB |
187 | return -EINVAL; |
188 | ||
08645126 JB |
189 | switch (params->cipher) { |
190 | case WLAN_CIPHER_SUITE_WEP40: | |
8fc0fee0 | 191 | if (params->key_len != WLAN_KEY_LEN_WEP40) |
08645126 JB |
192 | return -EINVAL; |
193 | break; | |
194 | case WLAN_CIPHER_SUITE_TKIP: | |
8fc0fee0 | 195 | if (params->key_len != WLAN_KEY_LEN_TKIP) |
08645126 JB |
196 | return -EINVAL; |
197 | break; | |
198 | case WLAN_CIPHER_SUITE_CCMP: | |
8fc0fee0 | 199 | if (params->key_len != WLAN_KEY_LEN_CCMP) |
08645126 JB |
200 | return -EINVAL; |
201 | break; | |
202 | case WLAN_CIPHER_SUITE_WEP104: | |
8fc0fee0 | 203 | if (params->key_len != WLAN_KEY_LEN_WEP104) |
08645126 JB |
204 | return -EINVAL; |
205 | break; | |
206 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
8fc0fee0 | 207 | if (params->key_len != WLAN_KEY_LEN_AES_CMAC) |
08645126 JB |
208 | return -EINVAL; |
209 | break; | |
210 | default: | |
7d64b7cc JB |
211 | /* |
212 | * We don't know anything about this algorithm, | |
213 | * allow using it -- but the driver must check | |
214 | * all parameters! We still check below whether | |
215 | * or not the driver supports this algorithm, | |
216 | * of course. | |
217 | */ | |
218 | break; | |
08645126 JB |
219 | } |
220 | ||
9f26a952 JM |
221 | if (params->seq) { |
222 | switch (params->cipher) { | |
223 | case WLAN_CIPHER_SUITE_WEP40: | |
224 | case WLAN_CIPHER_SUITE_WEP104: | |
225 | /* These ciphers do not use key sequence */ | |
226 | return -EINVAL; | |
227 | case WLAN_CIPHER_SUITE_TKIP: | |
228 | case WLAN_CIPHER_SUITE_CCMP: | |
229 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
230 | if (params->seq_len != 6) | |
231 | return -EINVAL; | |
232 | break; | |
233 | } | |
234 | } | |
235 | ||
38ba3c57 | 236 | if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher)) |
fffd0934 JB |
237 | return -EINVAL; |
238 | ||
08645126 JB |
239 | return 0; |
240 | } | |
e31a16d6 ZY |
241 | |
242 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
243 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
244 | const unsigned char rfc1042_header[] __aligned(2) = | |
245 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
246 | EXPORT_SYMBOL(rfc1042_header); | |
247 | ||
248 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
249 | const unsigned char bridge_tunnel_header[] __aligned(2) = | |
250 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
251 | EXPORT_SYMBOL(bridge_tunnel_header); | |
252 | ||
633adf1a | 253 | unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc) |
e31a16d6 ZY |
254 | { |
255 | unsigned int hdrlen = 24; | |
256 | ||
257 | if (ieee80211_is_data(fc)) { | |
258 | if (ieee80211_has_a4(fc)) | |
259 | hdrlen = 30; | |
d0dd2de0 | 260 | if (ieee80211_is_data_qos(fc)) { |
e31a16d6 | 261 | hdrlen += IEEE80211_QOS_CTL_LEN; |
d0dd2de0 AT |
262 | if (ieee80211_has_order(fc)) |
263 | hdrlen += IEEE80211_HT_CTL_LEN; | |
264 | } | |
e31a16d6 ZY |
265 | goto out; |
266 | } | |
267 | ||
268 | if (ieee80211_is_ctl(fc)) { | |
269 | /* | |
270 | * ACK and CTS are 10 bytes, all others 16. To see how | |
271 | * to get this condition consider | |
272 | * subtype mask: 0b0000000011110000 (0x00F0) | |
273 | * ACK subtype: 0b0000000011010000 (0x00D0) | |
274 | * CTS subtype: 0b0000000011000000 (0x00C0) | |
275 | * bits that matter: ^^^ (0x00E0) | |
276 | * value of those: 0b0000000011000000 (0x00C0) | |
277 | */ | |
278 | if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) | |
279 | hdrlen = 10; | |
280 | else | |
281 | hdrlen = 16; | |
282 | } | |
283 | out: | |
284 | return hdrlen; | |
285 | } | |
286 | EXPORT_SYMBOL(ieee80211_hdrlen); | |
287 | ||
288 | unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) | |
289 | { | |
290 | const struct ieee80211_hdr *hdr = | |
291 | (const struct ieee80211_hdr *)skb->data; | |
292 | unsigned int hdrlen; | |
293 | ||
294 | if (unlikely(skb->len < 10)) | |
295 | return 0; | |
296 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
297 | if (unlikely(hdrlen > skb->len)) | |
298 | return 0; | |
299 | return hdrlen; | |
300 | } | |
301 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); | |
302 | ||
60fd2b67 | 303 | static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) |
e31a16d6 ZY |
304 | { |
305 | int ae = meshhdr->flags & MESH_FLAGS_AE; | |
306 | /* 7.1.3.5a.2 */ | |
307 | switch (ae) { | |
308 | case 0: | |
309 | return 6; | |
3c5772a5 | 310 | case MESH_FLAGS_AE_A4: |
e31a16d6 | 311 | return 12; |
3c5772a5 | 312 | case MESH_FLAGS_AE_A5_A6: |
e31a16d6 | 313 | return 18; |
3c5772a5 | 314 | case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): |
e31a16d6 ZY |
315 | return 24; |
316 | default: | |
317 | return 6; | |
318 | } | |
319 | } | |
320 | ||
eaf85ca7 | 321 | int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
322 | enum nl80211_iftype iftype) |
323 | { | |
324 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
325 | u16 hdrlen, ethertype; | |
326 | u8 *payload; | |
327 | u8 dst[ETH_ALEN]; | |
328 | u8 src[ETH_ALEN] __aligned(2); | |
329 | ||
330 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) | |
331 | return -1; | |
332 | ||
333 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
334 | ||
335 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
336 | * header | |
337 | * IEEE 802.11 address fields: | |
338 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
339 | * 0 0 DA SA BSSID n/a | |
340 | * 0 1 DA BSSID SA n/a | |
341 | * 1 0 BSSID SA DA n/a | |
342 | * 1 1 RA TA DA SA | |
343 | */ | |
344 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); | |
345 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
346 | ||
347 | switch (hdr->frame_control & | |
348 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
349 | case cpu_to_le16(IEEE80211_FCTL_TODS): | |
350 | if (unlikely(iftype != NL80211_IFTYPE_AP && | |
074ac8df JB |
351 | iftype != NL80211_IFTYPE_AP_VLAN && |
352 | iftype != NL80211_IFTYPE_P2P_GO)) | |
e31a16d6 ZY |
353 | return -1; |
354 | break; | |
355 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
356 | if (unlikely(iftype != NL80211_IFTYPE_WDS && | |
f14543ee FF |
357 | iftype != NL80211_IFTYPE_MESH_POINT && |
358 | iftype != NL80211_IFTYPE_AP_VLAN && | |
359 | iftype != NL80211_IFTYPE_STATION)) | |
e31a16d6 ZY |
360 | return -1; |
361 | if (iftype == NL80211_IFTYPE_MESH_POINT) { | |
362 | struct ieee80211s_hdr *meshdr = | |
363 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
364 | /* make sure meshdr->flags is on the linear part */ |
365 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
366 | return -1; | |
e31a16d6 | 367 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { |
e3cf8b3f ZY |
368 | skb_copy_bits(skb, hdrlen + |
369 | offsetof(struct ieee80211s_hdr, eaddr1), | |
370 | dst, ETH_ALEN); | |
371 | skb_copy_bits(skb, hdrlen + | |
372 | offsetof(struct ieee80211s_hdr, eaddr2), | |
373 | src, ETH_ALEN); | |
e31a16d6 | 374 | } |
e3cf8b3f | 375 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); |
e31a16d6 ZY |
376 | } |
377 | break; | |
378 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): | |
3c5772a5 | 379 | if ((iftype != NL80211_IFTYPE_STATION && |
074ac8df JB |
380 | iftype != NL80211_IFTYPE_P2P_CLIENT && |
381 | iftype != NL80211_IFTYPE_MESH_POINT) || | |
e31a16d6 ZY |
382 | (is_multicast_ether_addr(dst) && |
383 | !compare_ether_addr(src, addr))) | |
384 | return -1; | |
3c5772a5 JC |
385 | if (iftype == NL80211_IFTYPE_MESH_POINT) { |
386 | struct ieee80211s_hdr *meshdr = | |
387 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
388 | /* make sure meshdr->flags is on the linear part */ |
389 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
390 | return -1; | |
3c5772a5 | 391 | if (meshdr->flags & MESH_FLAGS_AE_A4) |
e3cf8b3f ZY |
392 | skb_copy_bits(skb, hdrlen + |
393 | offsetof(struct ieee80211s_hdr, eaddr1), | |
394 | src, ETH_ALEN); | |
395 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
3c5772a5 | 396 | } |
e31a16d6 ZY |
397 | break; |
398 | case cpu_to_le16(0): | |
941c93cd AN |
399 | if (iftype != NL80211_IFTYPE_ADHOC && |
400 | iftype != NL80211_IFTYPE_STATION) | |
401 | return -1; | |
e31a16d6 ZY |
402 | break; |
403 | } | |
404 | ||
e3cf8b3f | 405 | if (!pskb_may_pull(skb, hdrlen + 8)) |
e31a16d6 ZY |
406 | return -1; |
407 | ||
408 | payload = skb->data + hdrlen; | |
409 | ethertype = (payload[6] << 8) | payload[7]; | |
410 | ||
411 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
412 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
413 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
414 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
415 | * replace EtherType */ | |
416 | skb_pull(skb, hdrlen + 6); | |
417 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
418 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
419 | } else { | |
420 | struct ethhdr *ehdr; | |
421 | __be16 len; | |
422 | ||
423 | skb_pull(skb, hdrlen); | |
424 | len = htons(skb->len); | |
425 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
426 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
427 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
428 | ehdr->h_proto = len; | |
429 | } | |
430 | return 0; | |
431 | } | |
432 | EXPORT_SYMBOL(ieee80211_data_to_8023); | |
433 | ||
eaf85ca7 | 434 | int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
435 | enum nl80211_iftype iftype, u8 *bssid, bool qos) |
436 | { | |
437 | struct ieee80211_hdr hdr; | |
438 | u16 hdrlen, ethertype; | |
439 | __le16 fc; | |
440 | const u8 *encaps_data; | |
441 | int encaps_len, skip_header_bytes; | |
442 | int nh_pos, h_pos; | |
443 | int head_need; | |
444 | ||
445 | if (unlikely(skb->len < ETH_HLEN)) | |
446 | return -EINVAL; | |
447 | ||
448 | nh_pos = skb_network_header(skb) - skb->data; | |
449 | h_pos = skb_transport_header(skb) - skb->data; | |
450 | ||
451 | /* convert Ethernet header to proper 802.11 header (based on | |
452 | * operation mode) */ | |
453 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
454 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); | |
455 | ||
456 | switch (iftype) { | |
457 | case NL80211_IFTYPE_AP: | |
458 | case NL80211_IFTYPE_AP_VLAN: | |
074ac8df | 459 | case NL80211_IFTYPE_P2P_GO: |
e31a16d6 ZY |
460 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
461 | /* DA BSSID SA */ | |
462 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
463 | memcpy(hdr.addr2, addr, ETH_ALEN); | |
464 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
465 | hdrlen = 24; | |
466 | break; | |
467 | case NL80211_IFTYPE_STATION: | |
074ac8df | 468 | case NL80211_IFTYPE_P2P_CLIENT: |
e31a16d6 ZY |
469 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
470 | /* BSSID SA DA */ | |
471 | memcpy(hdr.addr1, bssid, ETH_ALEN); | |
472 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
473 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
474 | hdrlen = 24; | |
475 | break; | |
476 | case NL80211_IFTYPE_ADHOC: | |
477 | /* DA SA BSSID */ | |
478 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
479 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
480 | memcpy(hdr.addr3, bssid, ETH_ALEN); | |
481 | hdrlen = 24; | |
482 | break; | |
483 | default: | |
484 | return -EOPNOTSUPP; | |
485 | } | |
486 | ||
487 | if (qos) { | |
488 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
489 | hdrlen += 2; | |
490 | } | |
491 | ||
492 | hdr.frame_control = fc; | |
493 | hdr.duration_id = 0; | |
494 | hdr.seq_ctrl = 0; | |
495 | ||
496 | skip_header_bytes = ETH_HLEN; | |
497 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
498 | encaps_data = bridge_tunnel_header; | |
499 | encaps_len = sizeof(bridge_tunnel_header); | |
500 | skip_header_bytes -= 2; | |
501 | } else if (ethertype > 0x600) { | |
502 | encaps_data = rfc1042_header; | |
503 | encaps_len = sizeof(rfc1042_header); | |
504 | skip_header_bytes -= 2; | |
505 | } else { | |
506 | encaps_data = NULL; | |
507 | encaps_len = 0; | |
508 | } | |
509 | ||
510 | skb_pull(skb, skip_header_bytes); | |
511 | nh_pos -= skip_header_bytes; | |
512 | h_pos -= skip_header_bytes; | |
513 | ||
514 | head_need = hdrlen + encaps_len - skb_headroom(skb); | |
515 | ||
516 | if (head_need > 0 || skb_cloned(skb)) { | |
517 | head_need = max(head_need, 0); | |
518 | if (head_need) | |
519 | skb_orphan(skb); | |
520 | ||
24616152 | 521 | if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) |
e31a16d6 | 522 | return -ENOMEM; |
24616152 | 523 | |
e31a16d6 ZY |
524 | skb->truesize += head_need; |
525 | } | |
526 | ||
527 | if (encaps_data) { | |
528 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
529 | nh_pos += encaps_len; | |
530 | h_pos += encaps_len; | |
531 | } | |
532 | ||
533 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
534 | ||
535 | nh_pos += hdrlen; | |
536 | h_pos += hdrlen; | |
537 | ||
538 | /* Update skb pointers to various headers since this modified frame | |
539 | * is going to go through Linux networking code that may potentially | |
540 | * need things like pointer to IP header. */ | |
541 | skb_set_mac_header(skb, 0); | |
542 | skb_set_network_header(skb, nh_pos); | |
543 | skb_set_transport_header(skb, h_pos); | |
544 | ||
545 | return 0; | |
546 | } | |
547 | EXPORT_SYMBOL(ieee80211_data_from_8023); | |
548 | ||
eaf85ca7 ZY |
549 | |
550 | void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, | |
551 | const u8 *addr, enum nl80211_iftype iftype, | |
8b3becad YAP |
552 | const unsigned int extra_headroom, |
553 | bool has_80211_header) | |
eaf85ca7 ZY |
554 | { |
555 | struct sk_buff *frame = NULL; | |
556 | u16 ethertype; | |
557 | u8 *payload; | |
558 | const struct ethhdr *eth; | |
559 | int remaining, err; | |
560 | u8 dst[ETH_ALEN], src[ETH_ALEN]; | |
561 | ||
8b3becad YAP |
562 | if (has_80211_header) { |
563 | err = ieee80211_data_to_8023(skb, addr, iftype); | |
564 | if (err) | |
565 | goto out; | |
eaf85ca7 | 566 | |
8b3becad YAP |
567 | /* skip the wrapping header */ |
568 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
569 | if (!eth) | |
570 | goto out; | |
571 | } else { | |
572 | eth = (struct ethhdr *) skb->data; | |
573 | } | |
eaf85ca7 ZY |
574 | |
575 | while (skb != frame) { | |
576 | u8 padding; | |
577 | __be16 len = eth->h_proto; | |
578 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
579 | ||
580 | remaining = skb->len; | |
581 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
582 | memcpy(src, eth->h_source, ETH_ALEN); | |
583 | ||
584 | padding = (4 - subframe_len) & 0x3; | |
585 | /* the last MSDU has no padding */ | |
586 | if (subframe_len > remaining) | |
587 | goto purge; | |
588 | ||
589 | skb_pull(skb, sizeof(struct ethhdr)); | |
590 | /* reuse skb for the last subframe */ | |
591 | if (remaining <= subframe_len + padding) | |
592 | frame = skb; | |
593 | else { | |
594 | unsigned int hlen = ALIGN(extra_headroom, 4); | |
595 | /* | |
596 | * Allocate and reserve two bytes more for payload | |
597 | * alignment since sizeof(struct ethhdr) is 14. | |
598 | */ | |
599 | frame = dev_alloc_skb(hlen + subframe_len + 2); | |
600 | if (!frame) | |
601 | goto purge; | |
602 | ||
603 | skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); | |
604 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
605 | ntohs(len)); | |
606 | ||
607 | eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + | |
608 | padding); | |
609 | if (!eth) { | |
610 | dev_kfree_skb(frame); | |
611 | goto purge; | |
612 | } | |
613 | } | |
614 | ||
615 | skb_reset_network_header(frame); | |
616 | frame->dev = skb->dev; | |
617 | frame->priority = skb->priority; | |
618 | ||
619 | payload = frame->data; | |
620 | ethertype = (payload[6] << 8) | payload[7]; | |
621 | ||
622 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
623 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
624 | compare_ether_addr(payload, | |
625 | bridge_tunnel_header) == 0)) { | |
626 | /* remove RFC1042 or Bridge-Tunnel | |
627 | * encapsulation and replace EtherType */ | |
628 | skb_pull(frame, 6); | |
629 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
630 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
631 | } else { | |
632 | memcpy(skb_push(frame, sizeof(__be16)), &len, | |
633 | sizeof(__be16)); | |
634 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
635 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
636 | } | |
637 | __skb_queue_tail(list, frame); | |
638 | } | |
639 | ||
640 | return; | |
641 | ||
642 | purge: | |
643 | __skb_queue_purge(list); | |
644 | out: | |
645 | dev_kfree_skb(skb); | |
646 | } | |
647 | EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); | |
648 | ||
e31a16d6 ZY |
649 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
650 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) | |
651 | { | |
652 | unsigned int dscp; | |
653 | ||
654 | /* skb->priority values from 256->263 are magic values to | |
655 | * directly indicate a specific 802.1d priority. This is used | |
656 | * to allow 802.1d priority to be passed directly in from VLAN | |
657 | * tags, etc. | |
658 | */ | |
659 | if (skb->priority >= 256 && skb->priority <= 263) | |
660 | return skb->priority - 256; | |
661 | ||
662 | switch (skb->protocol) { | |
663 | case htons(ETH_P_IP): | |
664 | dscp = ip_hdr(skb)->tos & 0xfc; | |
665 | break; | |
666 | default: | |
667 | return 0; | |
668 | } | |
669 | ||
670 | return dscp >> 5; | |
671 | } | |
672 | EXPORT_SYMBOL(cfg80211_classify8021d); | |
517357c6 JB |
673 | |
674 | const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) | |
675 | { | |
676 | u8 *end, *pos; | |
677 | ||
678 | pos = bss->information_elements; | |
679 | if (pos == NULL) | |
680 | return NULL; | |
681 | end = pos + bss->len_information_elements; | |
682 | ||
683 | while (pos + 1 < end) { | |
684 | if (pos + 2 + pos[1] > end) | |
685 | break; | |
686 | if (pos[0] == ie) | |
687 | return pos; | |
688 | pos += 2 + pos[1]; | |
689 | } | |
690 | ||
691 | return NULL; | |
692 | } | |
693 | EXPORT_SYMBOL(ieee80211_bss_get_ie); | |
fffd0934 JB |
694 | |
695 | void cfg80211_upload_connect_keys(struct wireless_dev *wdev) | |
696 | { | |
697 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); | |
698 | struct net_device *dev = wdev->netdev; | |
699 | int i; | |
700 | ||
701 | if (!wdev->connect_keys) | |
702 | return; | |
703 | ||
704 | for (i = 0; i < 6; i++) { | |
705 | if (!wdev->connect_keys->params[i].cipher) | |
706 | continue; | |
e31b8213 | 707 | if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL, |
1e056665 | 708 | &wdev->connect_keys->params[i])) { |
e9c0268f | 709 | netdev_err(dev, "failed to set key %d\n", i); |
1e056665 ZY |
710 | continue; |
711 | } | |
fffd0934 | 712 | if (wdev->connect_keys->def == i) |
dbd2fd65 JB |
713 | if (rdev->ops->set_default_key(wdev->wiphy, dev, |
714 | i, true, true)) { | |
e9c0268f | 715 | netdev_err(dev, "failed to set defkey %d\n", i); |
1e056665 ZY |
716 | continue; |
717 | } | |
fffd0934 JB |
718 | if (wdev->connect_keys->defmgmt == i) |
719 | if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i)) | |
e9c0268f | 720 | netdev_err(dev, "failed to set mgtdef %d\n", i); |
fffd0934 JB |
721 | } |
722 | ||
723 | kfree(wdev->connect_keys); | |
724 | wdev->connect_keys = NULL; | |
725 | } | |
3d54d255 JB |
726 | |
727 | static void cfg80211_process_wdev_events(struct wireless_dev *wdev) | |
728 | { | |
729 | struct cfg80211_event *ev; | |
730 | unsigned long flags; | |
731 | const u8 *bssid = NULL; | |
732 | ||
733 | spin_lock_irqsave(&wdev->event_lock, flags); | |
734 | while (!list_empty(&wdev->event_list)) { | |
735 | ev = list_first_entry(&wdev->event_list, | |
736 | struct cfg80211_event, list); | |
737 | list_del(&ev->list); | |
738 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
739 | ||
740 | wdev_lock(wdev); | |
741 | switch (ev->type) { | |
742 | case EVENT_CONNECT_RESULT: | |
743 | if (!is_zero_ether_addr(ev->cr.bssid)) | |
744 | bssid = ev->cr.bssid; | |
745 | __cfg80211_connect_result( | |
746 | wdev->netdev, bssid, | |
747 | ev->cr.req_ie, ev->cr.req_ie_len, | |
748 | ev->cr.resp_ie, ev->cr.resp_ie_len, | |
749 | ev->cr.status, | |
750 | ev->cr.status == WLAN_STATUS_SUCCESS, | |
751 | NULL); | |
752 | break; | |
753 | case EVENT_ROAMED: | |
ed9d0102 | 754 | __cfg80211_roamed(wdev, ev->rm.channel, ev->rm.bssid, |
3d54d255 JB |
755 | ev->rm.req_ie, ev->rm.req_ie_len, |
756 | ev->rm.resp_ie, ev->rm.resp_ie_len); | |
757 | break; | |
758 | case EVENT_DISCONNECTED: | |
759 | __cfg80211_disconnected(wdev->netdev, | |
760 | ev->dc.ie, ev->dc.ie_len, | |
761 | ev->dc.reason, true); | |
762 | break; | |
763 | case EVENT_IBSS_JOINED: | |
764 | __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); | |
765 | break; | |
766 | } | |
767 | wdev_unlock(wdev); | |
768 | ||
769 | kfree(ev); | |
770 | ||
771 | spin_lock_irqsave(&wdev->event_lock, flags); | |
772 | } | |
773 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
774 | } | |
775 | ||
776 | void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) | |
777 | { | |
778 | struct wireless_dev *wdev; | |
779 | ||
780 | ASSERT_RTNL(); | |
781 | ASSERT_RDEV_LOCK(rdev); | |
782 | ||
783 | mutex_lock(&rdev->devlist_mtx); | |
784 | ||
785 | list_for_each_entry(wdev, &rdev->netdev_list, list) | |
786 | cfg80211_process_wdev_events(wdev); | |
787 | ||
788 | mutex_unlock(&rdev->devlist_mtx); | |
789 | } | |
790 | ||
791 | int cfg80211_change_iface(struct cfg80211_registered_device *rdev, | |
792 | struct net_device *dev, enum nl80211_iftype ntype, | |
793 | u32 *flags, struct vif_params *params) | |
794 | { | |
795 | int err; | |
796 | enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; | |
797 | ||
798 | ASSERT_RDEV_LOCK(rdev); | |
799 | ||
800 | /* don't support changing VLANs, you just re-create them */ | |
801 | if (otype == NL80211_IFTYPE_AP_VLAN) | |
802 | return -EOPNOTSUPP; | |
803 | ||
804 | if (!rdev->ops->change_virtual_intf || | |
805 | !(rdev->wiphy.interface_modes & (1 << ntype))) | |
806 | return -EOPNOTSUPP; | |
807 | ||
ad4bb6f8 | 808 | /* if it's part of a bridge, reject changing type to station/ibss */ |
f350a0a8 | 809 | if ((dev->priv_flags & IFF_BRIDGE_PORT) && |
074ac8df JB |
810 | (ntype == NL80211_IFTYPE_ADHOC || |
811 | ntype == NL80211_IFTYPE_STATION || | |
812 | ntype == NL80211_IFTYPE_P2P_CLIENT)) | |
ad4bb6f8 JB |
813 | return -EBUSY; |
814 | ||
3d54d255 | 815 | if (ntype != otype) { |
7527a782 JB |
816 | err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr, |
817 | ntype); | |
818 | if (err) | |
819 | return err; | |
820 | ||
9bc383de | 821 | dev->ieee80211_ptr->use_4addr = false; |
29cbe68c | 822 | dev->ieee80211_ptr->mesh_id_up_len = 0; |
9bc383de | 823 | |
3d54d255 JB |
824 | switch (otype) { |
825 | case NL80211_IFTYPE_ADHOC: | |
826 | cfg80211_leave_ibss(rdev, dev, false); | |
827 | break; | |
828 | case NL80211_IFTYPE_STATION: | |
074ac8df | 829 | case NL80211_IFTYPE_P2P_CLIENT: |
3d54d255 JB |
830 | cfg80211_disconnect(rdev, dev, |
831 | WLAN_REASON_DEAUTH_LEAVING, true); | |
832 | break; | |
833 | case NL80211_IFTYPE_MESH_POINT: | |
834 | /* mesh should be handled? */ | |
835 | break; | |
836 | default: | |
837 | break; | |
838 | } | |
839 | ||
840 | cfg80211_process_rdev_events(rdev); | |
841 | } | |
842 | ||
843 | err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev, | |
844 | ntype, flags, params); | |
845 | ||
846 | WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); | |
847 | ||
9bc383de JB |
848 | if (!err && params && params->use_4addr != -1) |
849 | dev->ieee80211_ptr->use_4addr = params->use_4addr; | |
850 | ||
ad4bb6f8 JB |
851 | if (!err) { |
852 | dev->priv_flags &= ~IFF_DONT_BRIDGE; | |
853 | switch (ntype) { | |
854 | case NL80211_IFTYPE_STATION: | |
855 | if (dev->ieee80211_ptr->use_4addr) | |
856 | break; | |
857 | /* fall through */ | |
074ac8df | 858 | case NL80211_IFTYPE_P2P_CLIENT: |
ad4bb6f8 JB |
859 | case NL80211_IFTYPE_ADHOC: |
860 | dev->priv_flags |= IFF_DONT_BRIDGE; | |
861 | break; | |
074ac8df | 862 | case NL80211_IFTYPE_P2P_GO: |
ad4bb6f8 JB |
863 | case NL80211_IFTYPE_AP: |
864 | case NL80211_IFTYPE_AP_VLAN: | |
865 | case NL80211_IFTYPE_WDS: | |
866 | case NL80211_IFTYPE_MESH_POINT: | |
867 | /* bridging OK */ | |
868 | break; | |
869 | case NL80211_IFTYPE_MONITOR: | |
870 | /* monitor can't bridge anyway */ | |
871 | break; | |
872 | case NL80211_IFTYPE_UNSPECIFIED: | |
2e161f78 | 873 | case NUM_NL80211_IFTYPES: |
ad4bb6f8 JB |
874 | /* not happening */ |
875 | break; | |
876 | } | |
877 | } | |
878 | ||
3d54d255 JB |
879 | return err; |
880 | } | |
254416aa JL |
881 | |
882 | u16 cfg80211_calculate_bitrate(struct rate_info *rate) | |
883 | { | |
884 | int modulation, streams, bitrate; | |
885 | ||
886 | if (!(rate->flags & RATE_INFO_FLAGS_MCS)) | |
887 | return rate->legacy; | |
888 | ||
889 | /* the formula below does only work for MCS values smaller than 32 */ | |
890 | if (rate->mcs >= 32) | |
891 | return 0; | |
892 | ||
893 | modulation = rate->mcs & 7; | |
894 | streams = (rate->mcs >> 3) + 1; | |
895 | ||
896 | bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ? | |
897 | 13500000 : 6500000; | |
898 | ||
899 | if (modulation < 4) | |
900 | bitrate *= (modulation + 1); | |
901 | else if (modulation == 4) | |
902 | bitrate *= (modulation + 2); | |
903 | else | |
904 | bitrate *= (modulation + 3); | |
905 | ||
906 | bitrate *= streams; | |
907 | ||
908 | if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) | |
909 | bitrate = (bitrate / 9) * 10; | |
910 | ||
911 | /* do NOT round down here */ | |
912 | return (bitrate + 50000) / 100000; | |
913 | } | |
56d1893d JB |
914 | |
915 | int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev, | |
916 | u32 beacon_int) | |
917 | { | |
918 | struct wireless_dev *wdev; | |
919 | int res = 0; | |
920 | ||
921 | if (!beacon_int) | |
922 | return -EINVAL; | |
923 | ||
924 | mutex_lock(&rdev->devlist_mtx); | |
925 | ||
926 | list_for_each_entry(wdev, &rdev->netdev_list, list) { | |
927 | if (!wdev->beacon_interval) | |
928 | continue; | |
929 | if (wdev->beacon_interval != beacon_int) { | |
930 | res = -EINVAL; | |
931 | break; | |
932 | } | |
933 | } | |
934 | ||
935 | mutex_unlock(&rdev->devlist_mtx); | |
936 | ||
937 | return res; | |
938 | } | |
7527a782 JB |
939 | |
940 | int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev, | |
941 | struct wireless_dev *wdev, | |
942 | enum nl80211_iftype iftype) | |
943 | { | |
944 | struct wireless_dev *wdev_iter; | |
945 | int num[NUM_NL80211_IFTYPES]; | |
946 | int total = 1; | |
947 | int i, j; | |
948 | ||
949 | ASSERT_RTNL(); | |
950 | ||
951 | /* Always allow software iftypes */ | |
952 | if (rdev->wiphy.software_iftypes & BIT(iftype)) | |
953 | return 0; | |
954 | ||
955 | /* | |
956 | * Drivers will gradually all set this flag, until all | |
957 | * have it we only enforce for those that set it. | |
958 | */ | |
959 | if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS)) | |
960 | return 0; | |
961 | ||
962 | memset(num, 0, sizeof(num)); | |
963 | ||
964 | num[iftype] = 1; | |
965 | ||
966 | mutex_lock(&rdev->devlist_mtx); | |
967 | list_for_each_entry(wdev_iter, &rdev->netdev_list, list) { | |
968 | if (wdev_iter == wdev) | |
969 | continue; | |
970 | if (!netif_running(wdev_iter->netdev)) | |
971 | continue; | |
972 | ||
973 | if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype)) | |
974 | continue; | |
975 | ||
976 | num[wdev_iter->iftype]++; | |
977 | total++; | |
978 | } | |
979 | mutex_unlock(&rdev->devlist_mtx); | |
980 | ||
981 | for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) { | |
982 | const struct ieee80211_iface_combination *c; | |
983 | struct ieee80211_iface_limit *limits; | |
984 | ||
985 | c = &rdev->wiphy.iface_combinations[i]; | |
986 | ||
987 | limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits, | |
988 | GFP_KERNEL); | |
989 | if (!limits) | |
990 | return -ENOMEM; | |
991 | if (total > c->max_interfaces) | |
992 | goto cont; | |
993 | ||
994 | for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) { | |
995 | if (rdev->wiphy.software_iftypes & BIT(iftype)) | |
996 | continue; | |
997 | for (j = 0; j < c->n_limits; j++) { | |
998 | if (!(limits[j].types & iftype)) | |
999 | continue; | |
1000 | if (limits[j].max < num[iftype]) | |
1001 | goto cont; | |
1002 | limits[j].max -= num[iftype]; | |
1003 | } | |
1004 | } | |
1005 | /* yay, it fits */ | |
1006 | kfree(limits); | |
1007 | return 0; | |
1008 | cont: | |
1009 | kfree(limits); | |
1010 | } | |
1011 | ||
1012 | return -EBUSY; | |
1013 | } | |
34850ab2 JB |
1014 | |
1015 | int ieee80211_get_ratemask(struct ieee80211_supported_band *sband, | |
1016 | const u8 *rates, unsigned int n_rates, | |
1017 | u32 *mask) | |
1018 | { | |
1019 | int i, j; | |
1020 | ||
a401d2bb JB |
1021 | if (!sband) |
1022 | return -EINVAL; | |
1023 | ||
34850ab2 JB |
1024 | if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES) |
1025 | return -EINVAL; | |
1026 | ||
1027 | *mask = 0; | |
1028 | ||
1029 | for (i = 0; i < n_rates; i++) { | |
1030 | int rate = (rates[i] & 0x7f) * 5; | |
1031 | bool found = false; | |
1032 | ||
1033 | for (j = 0; j < sband->n_bitrates; j++) { | |
1034 | if (sband->bitrates[j].bitrate == rate) { | |
1035 | found = true; | |
1036 | *mask |= BIT(j); | |
1037 | break; | |
1038 | } | |
1039 | } | |
1040 | if (!found) | |
1041 | return -EINVAL; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * mask must have at least one bit set here since we | |
1046 | * didn't accept a 0-length rates array nor allowed | |
1047 | * entries in the array that didn't exist | |
1048 | */ | |
1049 | ||
1050 | return 0; | |
1051 | } | |
0879fa44 YAP |
1052 | |
1053 | u32 ieee802_11_parse_elems_crc(u8 *start, size_t len, | |
1054 | struct ieee802_11_elems *elems, | |
1055 | u64 filter, u32 crc) | |
1056 | { | |
1057 | size_t left = len; | |
1058 | u8 *pos = start; | |
1059 | bool calc_crc = filter != 0; | |
1060 | ||
1061 | memset(elems, 0, sizeof(*elems)); | |
1062 | elems->ie_start = start; | |
1063 | elems->total_len = len; | |
1064 | ||
1065 | while (left >= 2) { | |
1066 | u8 id, elen; | |
1067 | ||
1068 | id = *pos++; | |
1069 | elen = *pos++; | |
1070 | left -= 2; | |
1071 | ||
1072 | if (elen > left) | |
1073 | break; | |
1074 | ||
1075 | if (calc_crc && id < 64 && (filter & (1ULL << id))) | |
1076 | crc = crc32_be(crc, pos - 2, elen + 2); | |
1077 | ||
1078 | switch (id) { | |
1079 | case WLAN_EID_SSID: | |
1080 | elems->ssid = pos; | |
1081 | elems->ssid_len = elen; | |
1082 | break; | |
1083 | case WLAN_EID_SUPP_RATES: | |
1084 | elems->supp_rates = pos; | |
1085 | elems->supp_rates_len = elen; | |
1086 | break; | |
1087 | case WLAN_EID_FH_PARAMS: | |
1088 | elems->fh_params = pos; | |
1089 | elems->fh_params_len = elen; | |
1090 | break; | |
1091 | case WLAN_EID_DS_PARAMS: | |
1092 | elems->ds_params = pos; | |
1093 | elems->ds_params_len = elen; | |
1094 | break; | |
1095 | case WLAN_EID_CF_PARAMS: | |
1096 | elems->cf_params = pos; | |
1097 | elems->cf_params_len = elen; | |
1098 | break; | |
1099 | case WLAN_EID_TIM: | |
1100 | if (elen >= sizeof(struct ieee80211_tim_ie)) { | |
1101 | elems->tim = (void *)pos; | |
1102 | elems->tim_len = elen; | |
1103 | } | |
1104 | break; | |
1105 | case WLAN_EID_IBSS_PARAMS: | |
1106 | elems->ibss_params = pos; | |
1107 | elems->ibss_params_len = elen; | |
1108 | break; | |
1109 | case WLAN_EID_CHALLENGE: | |
1110 | elems->challenge = pos; | |
1111 | elems->challenge_len = elen; | |
1112 | break; | |
1113 | case WLAN_EID_VENDOR_SPECIFIC: | |
1114 | if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && | |
1115 | pos[2] == 0xf2) { | |
1116 | /* Microsoft OUI (00:50:F2) */ | |
1117 | ||
1118 | if (calc_crc) | |
1119 | crc = crc32_be(crc, pos - 2, elen + 2); | |
1120 | ||
1121 | if (pos[3] == 1) { | |
1122 | /* OUI Type 1 - WPA IE */ | |
1123 | elems->wpa = pos; | |
1124 | elems->wpa_len = elen; | |
1125 | } else if (elen >= 5 && pos[3] == 2) { | |
1126 | /* OUI Type 2 - WMM IE */ | |
1127 | if (pos[4] == 0) { | |
1128 | elems->wmm_info = pos; | |
1129 | elems->wmm_info_len = elen; | |
1130 | } else if (pos[4] == 1) { | |
1131 | elems->wmm_param = pos; | |
1132 | elems->wmm_param_len = elen; | |
1133 | } | |
1134 | } | |
1135 | } | |
1136 | break; | |
1137 | case WLAN_EID_RSN: | |
1138 | elems->rsn = pos; | |
1139 | elems->rsn_len = elen; | |
1140 | break; | |
1141 | case WLAN_EID_ERP_INFO: | |
1142 | elems->erp_info = pos; | |
1143 | elems->erp_info_len = elen; | |
1144 | break; | |
1145 | case WLAN_EID_EXT_SUPP_RATES: | |
1146 | elems->ext_supp_rates = pos; | |
1147 | elems->ext_supp_rates_len = elen; | |
1148 | break; | |
1149 | case WLAN_EID_HT_CAPABILITY: | |
1150 | if (elen >= sizeof(struct ieee80211_ht_cap)) | |
1151 | elems->ht_cap_elem = (void *)pos; | |
1152 | break; | |
1153 | case WLAN_EID_HT_INFORMATION: | |
1154 | if (elen >= sizeof(struct ieee80211_ht_info)) | |
1155 | elems->ht_info_elem = (void *)pos; | |
1156 | break; | |
1157 | case WLAN_EID_MESH_ID: | |
1158 | elems->mesh_id = pos; | |
1159 | elems->mesh_id_len = elen; | |
1160 | break; | |
1161 | case WLAN_EID_MESH_CONFIG: | |
1162 | if (elen >= sizeof(struct ieee80211_meshconf_ie)) | |
1163 | elems->mesh_config = (void *)pos; | |
1164 | break; | |
8db09850 TP |
1165 | case WLAN_EID_PEER_MGMT: |
1166 | elems->peering = pos; | |
1167 | elems->peering_len = elen; | |
0879fa44 YAP |
1168 | break; |
1169 | case WLAN_EID_PREQ: | |
1170 | elems->preq = pos; | |
1171 | elems->preq_len = elen; | |
1172 | break; | |
1173 | case WLAN_EID_PREP: | |
1174 | elems->prep = pos; | |
1175 | elems->prep_len = elen; | |
1176 | break; | |
1177 | case WLAN_EID_PERR: | |
1178 | elems->perr = pos; | |
1179 | elems->perr_len = elen; | |
1180 | break; | |
1181 | case WLAN_EID_RANN: | |
1182 | if (elen >= sizeof(struct ieee80211_rann_ie)) | |
1183 | elems->rann = (void *)pos; | |
1184 | break; | |
1185 | case WLAN_EID_CHANNEL_SWITCH: | |
1186 | elems->ch_switch_elem = pos; | |
1187 | elems->ch_switch_elem_len = elen; | |
1188 | break; | |
1189 | case WLAN_EID_QUIET: | |
1190 | if (!elems->quiet_elem) { | |
1191 | elems->quiet_elem = pos; | |
1192 | elems->quiet_elem_len = elen; | |
1193 | } | |
1194 | elems->num_of_quiet_elem++; | |
1195 | break; | |
1196 | case WLAN_EID_COUNTRY: | |
1197 | elems->country_elem = pos; | |
1198 | elems->country_elem_len = elen; | |
1199 | break; | |
1200 | case WLAN_EID_PWR_CONSTRAINT: | |
1201 | elems->pwr_constr_elem = pos; | |
1202 | elems->pwr_constr_elem_len = elen; | |
1203 | break; | |
1204 | case WLAN_EID_TIMEOUT_INTERVAL: | |
1205 | elems->timeout_int = pos; | |
1206 | elems->timeout_int_len = elen; | |
1207 | break; | |
1208 | default: | |
1209 | break; | |
1210 | } | |
1211 | ||
1212 | left -= elen; | |
1213 | pos += elen; | |
1214 | } | |
1215 | ||
1216 | return crc; | |
1217 | } | |
1218 | EXPORT_SYMBOL(ieee802_11_parse_elems_crc); |