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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, | |
e31b8213 | 147 | bool pairwise, const u8 *mac_addr) |
08645126 | 148 | { |
fffd0934 JB |
149 | int i; |
150 | ||
08645126 JB |
151 | if (key_idx > 5) |
152 | return -EINVAL; | |
153 | ||
e31b8213 JB |
154 | if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)) |
155 | return -EINVAL; | |
156 | ||
157 | if (pairwise && !mac_addr) | |
158 | return -EINVAL; | |
159 | ||
08645126 JB |
160 | /* |
161 | * Disallow pairwise keys with non-zero index unless it's WEP | |
162 | * (because current deployments use pairwise WEP keys with | |
163 | * non-zero indizes but 802.11i clearly specifies to use zero) | |
164 | */ | |
e31b8213 | 165 | if (pairwise && key_idx && |
08645126 JB |
166 | params->cipher != WLAN_CIPHER_SUITE_WEP40 && |
167 | params->cipher != WLAN_CIPHER_SUITE_WEP104) | |
168 | return -EINVAL; | |
169 | ||
08645126 JB |
170 | switch (params->cipher) { |
171 | case WLAN_CIPHER_SUITE_WEP40: | |
8fc0fee0 | 172 | if (params->key_len != WLAN_KEY_LEN_WEP40) |
08645126 JB |
173 | return -EINVAL; |
174 | break; | |
175 | case WLAN_CIPHER_SUITE_TKIP: | |
8fc0fee0 | 176 | if (params->key_len != WLAN_KEY_LEN_TKIP) |
08645126 JB |
177 | return -EINVAL; |
178 | break; | |
179 | case WLAN_CIPHER_SUITE_CCMP: | |
8fc0fee0 | 180 | if (params->key_len != WLAN_KEY_LEN_CCMP) |
08645126 JB |
181 | return -EINVAL; |
182 | break; | |
183 | case WLAN_CIPHER_SUITE_WEP104: | |
8fc0fee0 | 184 | if (params->key_len != WLAN_KEY_LEN_WEP104) |
08645126 JB |
185 | return -EINVAL; |
186 | break; | |
187 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
8fc0fee0 | 188 | if (params->key_len != WLAN_KEY_LEN_AES_CMAC) |
08645126 JB |
189 | return -EINVAL; |
190 | break; | |
191 | default: | |
7d64b7cc JB |
192 | /* |
193 | * We don't know anything about this algorithm, | |
194 | * allow using it -- but the driver must check | |
195 | * all parameters! We still check below whether | |
196 | * or not the driver supports this algorithm, | |
197 | * of course. | |
198 | */ | |
199 | break; | |
08645126 JB |
200 | } |
201 | ||
9f26a952 JM |
202 | if (params->seq) { |
203 | switch (params->cipher) { | |
204 | case WLAN_CIPHER_SUITE_WEP40: | |
205 | case WLAN_CIPHER_SUITE_WEP104: | |
206 | /* These ciphers do not use key sequence */ | |
207 | return -EINVAL; | |
208 | case WLAN_CIPHER_SUITE_TKIP: | |
209 | case WLAN_CIPHER_SUITE_CCMP: | |
210 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
211 | if (params->seq_len != 6) | |
212 | return -EINVAL; | |
213 | break; | |
214 | } | |
215 | } | |
216 | ||
fffd0934 JB |
217 | for (i = 0; i < rdev->wiphy.n_cipher_suites; i++) |
218 | if (params->cipher == rdev->wiphy.cipher_suites[i]) | |
219 | break; | |
220 | if (i == rdev->wiphy.n_cipher_suites) | |
221 | return -EINVAL; | |
222 | ||
08645126 JB |
223 | return 0; |
224 | } | |
e31a16d6 ZY |
225 | |
226 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
227 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
228 | const unsigned char rfc1042_header[] __aligned(2) = | |
229 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
230 | EXPORT_SYMBOL(rfc1042_header); | |
231 | ||
232 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
233 | const unsigned char bridge_tunnel_header[] __aligned(2) = | |
234 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
235 | EXPORT_SYMBOL(bridge_tunnel_header); | |
236 | ||
633adf1a | 237 | unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc) |
e31a16d6 ZY |
238 | { |
239 | unsigned int hdrlen = 24; | |
240 | ||
241 | if (ieee80211_is_data(fc)) { | |
242 | if (ieee80211_has_a4(fc)) | |
243 | hdrlen = 30; | |
d0dd2de0 | 244 | if (ieee80211_is_data_qos(fc)) { |
e31a16d6 | 245 | hdrlen += IEEE80211_QOS_CTL_LEN; |
d0dd2de0 AT |
246 | if (ieee80211_has_order(fc)) |
247 | hdrlen += IEEE80211_HT_CTL_LEN; | |
248 | } | |
e31a16d6 ZY |
249 | goto out; |
250 | } | |
251 | ||
252 | if (ieee80211_is_ctl(fc)) { | |
253 | /* | |
254 | * ACK and CTS are 10 bytes, all others 16. To see how | |
255 | * to get this condition consider | |
256 | * subtype mask: 0b0000000011110000 (0x00F0) | |
257 | * ACK subtype: 0b0000000011010000 (0x00D0) | |
258 | * CTS subtype: 0b0000000011000000 (0x00C0) | |
259 | * bits that matter: ^^^ (0x00E0) | |
260 | * value of those: 0b0000000011000000 (0x00C0) | |
261 | */ | |
262 | if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) | |
263 | hdrlen = 10; | |
264 | else | |
265 | hdrlen = 16; | |
266 | } | |
267 | out: | |
268 | return hdrlen; | |
269 | } | |
270 | EXPORT_SYMBOL(ieee80211_hdrlen); | |
271 | ||
272 | unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) | |
273 | { | |
274 | const struct ieee80211_hdr *hdr = | |
275 | (const struct ieee80211_hdr *)skb->data; | |
276 | unsigned int hdrlen; | |
277 | ||
278 | if (unlikely(skb->len < 10)) | |
279 | return 0; | |
280 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
281 | if (unlikely(hdrlen > skb->len)) | |
282 | return 0; | |
283 | return hdrlen; | |
284 | } | |
285 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); | |
286 | ||
60fd2b67 | 287 | static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) |
e31a16d6 ZY |
288 | { |
289 | int ae = meshhdr->flags & MESH_FLAGS_AE; | |
290 | /* 7.1.3.5a.2 */ | |
291 | switch (ae) { | |
292 | case 0: | |
293 | return 6; | |
3c5772a5 | 294 | case MESH_FLAGS_AE_A4: |
e31a16d6 | 295 | return 12; |
3c5772a5 | 296 | case MESH_FLAGS_AE_A5_A6: |
e31a16d6 | 297 | return 18; |
3c5772a5 | 298 | case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): |
e31a16d6 ZY |
299 | return 24; |
300 | default: | |
301 | return 6; | |
302 | } | |
303 | } | |
304 | ||
eaf85ca7 | 305 | int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
306 | enum nl80211_iftype iftype) |
307 | { | |
308 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
309 | u16 hdrlen, ethertype; | |
310 | u8 *payload; | |
311 | u8 dst[ETH_ALEN]; | |
312 | u8 src[ETH_ALEN] __aligned(2); | |
313 | ||
314 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) | |
315 | return -1; | |
316 | ||
317 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
318 | ||
319 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
320 | * header | |
321 | * IEEE 802.11 address fields: | |
322 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
323 | * 0 0 DA SA BSSID n/a | |
324 | * 0 1 DA BSSID SA n/a | |
325 | * 1 0 BSSID SA DA n/a | |
326 | * 1 1 RA TA DA SA | |
327 | */ | |
328 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); | |
329 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
330 | ||
331 | switch (hdr->frame_control & | |
332 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
333 | case cpu_to_le16(IEEE80211_FCTL_TODS): | |
334 | if (unlikely(iftype != NL80211_IFTYPE_AP && | |
074ac8df JB |
335 | iftype != NL80211_IFTYPE_AP_VLAN && |
336 | iftype != NL80211_IFTYPE_P2P_GO)) | |
e31a16d6 ZY |
337 | return -1; |
338 | break; | |
339 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
340 | if (unlikely(iftype != NL80211_IFTYPE_WDS && | |
f14543ee FF |
341 | iftype != NL80211_IFTYPE_MESH_POINT && |
342 | iftype != NL80211_IFTYPE_AP_VLAN && | |
343 | iftype != NL80211_IFTYPE_STATION)) | |
e31a16d6 ZY |
344 | return -1; |
345 | if (iftype == NL80211_IFTYPE_MESH_POINT) { | |
346 | struct ieee80211s_hdr *meshdr = | |
347 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
348 | /* make sure meshdr->flags is on the linear part */ |
349 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
350 | return -1; | |
e31a16d6 | 351 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { |
e3cf8b3f ZY |
352 | skb_copy_bits(skb, hdrlen + |
353 | offsetof(struct ieee80211s_hdr, eaddr1), | |
354 | dst, ETH_ALEN); | |
355 | skb_copy_bits(skb, hdrlen + | |
356 | offsetof(struct ieee80211s_hdr, eaddr2), | |
357 | src, ETH_ALEN); | |
e31a16d6 | 358 | } |
e3cf8b3f | 359 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); |
e31a16d6 ZY |
360 | } |
361 | break; | |
362 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): | |
3c5772a5 | 363 | if ((iftype != NL80211_IFTYPE_STATION && |
074ac8df JB |
364 | iftype != NL80211_IFTYPE_P2P_CLIENT && |
365 | iftype != NL80211_IFTYPE_MESH_POINT) || | |
e31a16d6 ZY |
366 | (is_multicast_ether_addr(dst) && |
367 | !compare_ether_addr(src, addr))) | |
368 | return -1; | |
3c5772a5 JC |
369 | if (iftype == NL80211_IFTYPE_MESH_POINT) { |
370 | struct ieee80211s_hdr *meshdr = | |
371 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
372 | /* make sure meshdr->flags is on the linear part */ |
373 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
374 | return -1; | |
3c5772a5 | 375 | if (meshdr->flags & MESH_FLAGS_AE_A4) |
e3cf8b3f ZY |
376 | skb_copy_bits(skb, hdrlen + |
377 | offsetof(struct ieee80211s_hdr, eaddr1), | |
378 | src, ETH_ALEN); | |
379 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
3c5772a5 | 380 | } |
e31a16d6 ZY |
381 | break; |
382 | case cpu_to_le16(0): | |
383 | if (iftype != NL80211_IFTYPE_ADHOC) | |
384 | return -1; | |
385 | break; | |
386 | } | |
387 | ||
e3cf8b3f | 388 | if (!pskb_may_pull(skb, hdrlen + 8)) |
e31a16d6 ZY |
389 | return -1; |
390 | ||
391 | payload = skb->data + hdrlen; | |
392 | ethertype = (payload[6] << 8) | payload[7]; | |
393 | ||
394 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
395 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
396 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
397 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
398 | * replace EtherType */ | |
399 | skb_pull(skb, hdrlen + 6); | |
400 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
401 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
402 | } else { | |
403 | struct ethhdr *ehdr; | |
404 | __be16 len; | |
405 | ||
406 | skb_pull(skb, hdrlen); | |
407 | len = htons(skb->len); | |
408 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
409 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
410 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
411 | ehdr->h_proto = len; | |
412 | } | |
413 | return 0; | |
414 | } | |
415 | EXPORT_SYMBOL(ieee80211_data_to_8023); | |
416 | ||
eaf85ca7 | 417 | int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
418 | enum nl80211_iftype iftype, u8 *bssid, bool qos) |
419 | { | |
420 | struct ieee80211_hdr hdr; | |
421 | u16 hdrlen, ethertype; | |
422 | __le16 fc; | |
423 | const u8 *encaps_data; | |
424 | int encaps_len, skip_header_bytes; | |
425 | int nh_pos, h_pos; | |
426 | int head_need; | |
427 | ||
428 | if (unlikely(skb->len < ETH_HLEN)) | |
429 | return -EINVAL; | |
430 | ||
431 | nh_pos = skb_network_header(skb) - skb->data; | |
432 | h_pos = skb_transport_header(skb) - skb->data; | |
433 | ||
434 | /* convert Ethernet header to proper 802.11 header (based on | |
435 | * operation mode) */ | |
436 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
437 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); | |
438 | ||
439 | switch (iftype) { | |
440 | case NL80211_IFTYPE_AP: | |
441 | case NL80211_IFTYPE_AP_VLAN: | |
074ac8df | 442 | case NL80211_IFTYPE_P2P_GO: |
e31a16d6 ZY |
443 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
444 | /* DA BSSID SA */ | |
445 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
446 | memcpy(hdr.addr2, addr, ETH_ALEN); | |
447 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
448 | hdrlen = 24; | |
449 | break; | |
450 | case NL80211_IFTYPE_STATION: | |
074ac8df | 451 | case NL80211_IFTYPE_P2P_CLIENT: |
e31a16d6 ZY |
452 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
453 | /* BSSID SA DA */ | |
454 | memcpy(hdr.addr1, bssid, ETH_ALEN); | |
455 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
456 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
457 | hdrlen = 24; | |
458 | break; | |
459 | case NL80211_IFTYPE_ADHOC: | |
460 | /* DA SA BSSID */ | |
461 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
462 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
463 | memcpy(hdr.addr3, bssid, ETH_ALEN); | |
464 | hdrlen = 24; | |
465 | break; | |
466 | default: | |
467 | return -EOPNOTSUPP; | |
468 | } | |
469 | ||
470 | if (qos) { | |
471 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
472 | hdrlen += 2; | |
473 | } | |
474 | ||
475 | hdr.frame_control = fc; | |
476 | hdr.duration_id = 0; | |
477 | hdr.seq_ctrl = 0; | |
478 | ||
479 | skip_header_bytes = ETH_HLEN; | |
480 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
481 | encaps_data = bridge_tunnel_header; | |
482 | encaps_len = sizeof(bridge_tunnel_header); | |
483 | skip_header_bytes -= 2; | |
484 | } else if (ethertype > 0x600) { | |
485 | encaps_data = rfc1042_header; | |
486 | encaps_len = sizeof(rfc1042_header); | |
487 | skip_header_bytes -= 2; | |
488 | } else { | |
489 | encaps_data = NULL; | |
490 | encaps_len = 0; | |
491 | } | |
492 | ||
493 | skb_pull(skb, skip_header_bytes); | |
494 | nh_pos -= skip_header_bytes; | |
495 | h_pos -= skip_header_bytes; | |
496 | ||
497 | head_need = hdrlen + encaps_len - skb_headroom(skb); | |
498 | ||
499 | if (head_need > 0 || skb_cloned(skb)) { | |
500 | head_need = max(head_need, 0); | |
501 | if (head_need) | |
502 | skb_orphan(skb); | |
503 | ||
504 | if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) { | |
e9c0268f | 505 | pr_err("failed to reallocate Tx buffer\n"); |
e31a16d6 ZY |
506 | return -ENOMEM; |
507 | } | |
508 | skb->truesize += head_need; | |
509 | } | |
510 | ||
511 | if (encaps_data) { | |
512 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
513 | nh_pos += encaps_len; | |
514 | h_pos += encaps_len; | |
515 | } | |
516 | ||
517 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
518 | ||
519 | nh_pos += hdrlen; | |
520 | h_pos += hdrlen; | |
521 | ||
522 | /* Update skb pointers to various headers since this modified frame | |
523 | * is going to go through Linux networking code that may potentially | |
524 | * need things like pointer to IP header. */ | |
525 | skb_set_mac_header(skb, 0); | |
526 | skb_set_network_header(skb, nh_pos); | |
527 | skb_set_transport_header(skb, h_pos); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | EXPORT_SYMBOL(ieee80211_data_from_8023); | |
532 | ||
eaf85ca7 ZY |
533 | |
534 | void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, | |
535 | const u8 *addr, enum nl80211_iftype iftype, | |
536 | const unsigned int extra_headroom) | |
537 | { | |
538 | struct sk_buff *frame = NULL; | |
539 | u16 ethertype; | |
540 | u8 *payload; | |
541 | const struct ethhdr *eth; | |
542 | int remaining, err; | |
543 | u8 dst[ETH_ALEN], src[ETH_ALEN]; | |
544 | ||
545 | err = ieee80211_data_to_8023(skb, addr, iftype); | |
546 | if (err) | |
547 | goto out; | |
548 | ||
549 | /* skip the wrapping header */ | |
550 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
551 | if (!eth) | |
552 | goto out; | |
553 | ||
554 | while (skb != frame) { | |
555 | u8 padding; | |
556 | __be16 len = eth->h_proto; | |
557 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
558 | ||
559 | remaining = skb->len; | |
560 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
561 | memcpy(src, eth->h_source, ETH_ALEN); | |
562 | ||
563 | padding = (4 - subframe_len) & 0x3; | |
564 | /* the last MSDU has no padding */ | |
565 | if (subframe_len > remaining) | |
566 | goto purge; | |
567 | ||
568 | skb_pull(skb, sizeof(struct ethhdr)); | |
569 | /* reuse skb for the last subframe */ | |
570 | if (remaining <= subframe_len + padding) | |
571 | frame = skb; | |
572 | else { | |
573 | unsigned int hlen = ALIGN(extra_headroom, 4); | |
574 | /* | |
575 | * Allocate and reserve two bytes more for payload | |
576 | * alignment since sizeof(struct ethhdr) is 14. | |
577 | */ | |
578 | frame = dev_alloc_skb(hlen + subframe_len + 2); | |
579 | if (!frame) | |
580 | goto purge; | |
581 | ||
582 | skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); | |
583 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
584 | ntohs(len)); | |
585 | ||
586 | eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + | |
587 | padding); | |
588 | if (!eth) { | |
589 | dev_kfree_skb(frame); | |
590 | goto purge; | |
591 | } | |
592 | } | |
593 | ||
594 | skb_reset_network_header(frame); | |
595 | frame->dev = skb->dev; | |
596 | frame->priority = skb->priority; | |
597 | ||
598 | payload = frame->data; | |
599 | ethertype = (payload[6] << 8) | payload[7]; | |
600 | ||
601 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
602 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
603 | compare_ether_addr(payload, | |
604 | bridge_tunnel_header) == 0)) { | |
605 | /* remove RFC1042 or Bridge-Tunnel | |
606 | * encapsulation and replace EtherType */ | |
607 | skb_pull(frame, 6); | |
608 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
609 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
610 | } else { | |
611 | memcpy(skb_push(frame, sizeof(__be16)), &len, | |
612 | sizeof(__be16)); | |
613 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
614 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
615 | } | |
616 | __skb_queue_tail(list, frame); | |
617 | } | |
618 | ||
619 | return; | |
620 | ||
621 | purge: | |
622 | __skb_queue_purge(list); | |
623 | out: | |
624 | dev_kfree_skb(skb); | |
625 | } | |
626 | EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); | |
627 | ||
e31a16d6 ZY |
628 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
629 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) | |
630 | { | |
631 | unsigned int dscp; | |
632 | ||
633 | /* skb->priority values from 256->263 are magic values to | |
634 | * directly indicate a specific 802.1d priority. This is used | |
635 | * to allow 802.1d priority to be passed directly in from VLAN | |
636 | * tags, etc. | |
637 | */ | |
638 | if (skb->priority >= 256 && skb->priority <= 263) | |
639 | return skb->priority - 256; | |
640 | ||
641 | switch (skb->protocol) { | |
642 | case htons(ETH_P_IP): | |
643 | dscp = ip_hdr(skb)->tos & 0xfc; | |
644 | break; | |
645 | default: | |
646 | return 0; | |
647 | } | |
648 | ||
649 | return dscp >> 5; | |
650 | } | |
651 | EXPORT_SYMBOL(cfg80211_classify8021d); | |
517357c6 JB |
652 | |
653 | const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) | |
654 | { | |
655 | u8 *end, *pos; | |
656 | ||
657 | pos = bss->information_elements; | |
658 | if (pos == NULL) | |
659 | return NULL; | |
660 | end = pos + bss->len_information_elements; | |
661 | ||
662 | while (pos + 1 < end) { | |
663 | if (pos + 2 + pos[1] > end) | |
664 | break; | |
665 | if (pos[0] == ie) | |
666 | return pos; | |
667 | pos += 2 + pos[1]; | |
668 | } | |
669 | ||
670 | return NULL; | |
671 | } | |
672 | EXPORT_SYMBOL(ieee80211_bss_get_ie); | |
fffd0934 JB |
673 | |
674 | void cfg80211_upload_connect_keys(struct wireless_dev *wdev) | |
675 | { | |
676 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); | |
677 | struct net_device *dev = wdev->netdev; | |
678 | int i; | |
679 | ||
680 | if (!wdev->connect_keys) | |
681 | return; | |
682 | ||
683 | for (i = 0; i < 6; i++) { | |
684 | if (!wdev->connect_keys->params[i].cipher) | |
685 | continue; | |
e31b8213 | 686 | if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL, |
1e056665 | 687 | &wdev->connect_keys->params[i])) { |
e9c0268f | 688 | netdev_err(dev, "failed to set key %d\n", i); |
1e056665 ZY |
689 | continue; |
690 | } | |
fffd0934 | 691 | if (wdev->connect_keys->def == i) |
dbd2fd65 JB |
692 | if (rdev->ops->set_default_key(wdev->wiphy, dev, |
693 | i, true, true)) { | |
e9c0268f | 694 | netdev_err(dev, "failed to set defkey %d\n", i); |
1e056665 ZY |
695 | continue; |
696 | } | |
fffd0934 JB |
697 | if (wdev->connect_keys->defmgmt == i) |
698 | if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i)) | |
e9c0268f | 699 | netdev_err(dev, "failed to set mgtdef %d\n", i); |
fffd0934 JB |
700 | } |
701 | ||
702 | kfree(wdev->connect_keys); | |
703 | wdev->connect_keys = NULL; | |
704 | } | |
3d54d255 JB |
705 | |
706 | static void cfg80211_process_wdev_events(struct wireless_dev *wdev) | |
707 | { | |
708 | struct cfg80211_event *ev; | |
709 | unsigned long flags; | |
710 | const u8 *bssid = NULL; | |
711 | ||
712 | spin_lock_irqsave(&wdev->event_lock, flags); | |
713 | while (!list_empty(&wdev->event_list)) { | |
714 | ev = list_first_entry(&wdev->event_list, | |
715 | struct cfg80211_event, list); | |
716 | list_del(&ev->list); | |
717 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
718 | ||
719 | wdev_lock(wdev); | |
720 | switch (ev->type) { | |
721 | case EVENT_CONNECT_RESULT: | |
722 | if (!is_zero_ether_addr(ev->cr.bssid)) | |
723 | bssid = ev->cr.bssid; | |
724 | __cfg80211_connect_result( | |
725 | wdev->netdev, bssid, | |
726 | ev->cr.req_ie, ev->cr.req_ie_len, | |
727 | ev->cr.resp_ie, ev->cr.resp_ie_len, | |
728 | ev->cr.status, | |
729 | ev->cr.status == WLAN_STATUS_SUCCESS, | |
730 | NULL); | |
731 | break; | |
732 | case EVENT_ROAMED: | |
733 | __cfg80211_roamed(wdev, ev->rm.bssid, | |
734 | ev->rm.req_ie, ev->rm.req_ie_len, | |
735 | ev->rm.resp_ie, ev->rm.resp_ie_len); | |
736 | break; | |
737 | case EVENT_DISCONNECTED: | |
738 | __cfg80211_disconnected(wdev->netdev, | |
739 | ev->dc.ie, ev->dc.ie_len, | |
740 | ev->dc.reason, true); | |
741 | break; | |
742 | case EVENT_IBSS_JOINED: | |
743 | __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); | |
744 | break; | |
745 | } | |
746 | wdev_unlock(wdev); | |
747 | ||
748 | kfree(ev); | |
749 | ||
750 | spin_lock_irqsave(&wdev->event_lock, flags); | |
751 | } | |
752 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
753 | } | |
754 | ||
755 | void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) | |
756 | { | |
757 | struct wireless_dev *wdev; | |
758 | ||
759 | ASSERT_RTNL(); | |
760 | ASSERT_RDEV_LOCK(rdev); | |
761 | ||
762 | mutex_lock(&rdev->devlist_mtx); | |
763 | ||
764 | list_for_each_entry(wdev, &rdev->netdev_list, list) | |
765 | cfg80211_process_wdev_events(wdev); | |
766 | ||
767 | mutex_unlock(&rdev->devlist_mtx); | |
768 | } | |
769 | ||
770 | int cfg80211_change_iface(struct cfg80211_registered_device *rdev, | |
771 | struct net_device *dev, enum nl80211_iftype ntype, | |
772 | u32 *flags, struct vif_params *params) | |
773 | { | |
774 | int err; | |
775 | enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; | |
776 | ||
777 | ASSERT_RDEV_LOCK(rdev); | |
778 | ||
779 | /* don't support changing VLANs, you just re-create them */ | |
780 | if (otype == NL80211_IFTYPE_AP_VLAN) | |
781 | return -EOPNOTSUPP; | |
782 | ||
783 | if (!rdev->ops->change_virtual_intf || | |
784 | !(rdev->wiphy.interface_modes & (1 << ntype))) | |
785 | return -EOPNOTSUPP; | |
786 | ||
ad4bb6f8 | 787 | /* if it's part of a bridge, reject changing type to station/ibss */ |
f350a0a8 | 788 | if ((dev->priv_flags & IFF_BRIDGE_PORT) && |
074ac8df JB |
789 | (ntype == NL80211_IFTYPE_ADHOC || |
790 | ntype == NL80211_IFTYPE_STATION || | |
791 | ntype == NL80211_IFTYPE_P2P_CLIENT)) | |
ad4bb6f8 JB |
792 | return -EBUSY; |
793 | ||
3d54d255 | 794 | if (ntype != otype) { |
9bc383de | 795 | dev->ieee80211_ptr->use_4addr = false; |
29cbe68c | 796 | dev->ieee80211_ptr->mesh_id_up_len = 0; |
9bc383de | 797 | |
3d54d255 JB |
798 | switch (otype) { |
799 | case NL80211_IFTYPE_ADHOC: | |
800 | cfg80211_leave_ibss(rdev, dev, false); | |
801 | break; | |
802 | case NL80211_IFTYPE_STATION: | |
074ac8df | 803 | case NL80211_IFTYPE_P2P_CLIENT: |
3d54d255 JB |
804 | cfg80211_disconnect(rdev, dev, |
805 | WLAN_REASON_DEAUTH_LEAVING, true); | |
806 | break; | |
807 | case NL80211_IFTYPE_MESH_POINT: | |
808 | /* mesh should be handled? */ | |
809 | break; | |
810 | default: | |
811 | break; | |
812 | } | |
813 | ||
814 | cfg80211_process_rdev_events(rdev); | |
815 | } | |
816 | ||
817 | err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev, | |
818 | ntype, flags, params); | |
819 | ||
820 | WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); | |
821 | ||
9bc383de JB |
822 | if (!err && params && params->use_4addr != -1) |
823 | dev->ieee80211_ptr->use_4addr = params->use_4addr; | |
824 | ||
ad4bb6f8 JB |
825 | if (!err) { |
826 | dev->priv_flags &= ~IFF_DONT_BRIDGE; | |
827 | switch (ntype) { | |
828 | case NL80211_IFTYPE_STATION: | |
829 | if (dev->ieee80211_ptr->use_4addr) | |
830 | break; | |
831 | /* fall through */ | |
074ac8df | 832 | case NL80211_IFTYPE_P2P_CLIENT: |
ad4bb6f8 JB |
833 | case NL80211_IFTYPE_ADHOC: |
834 | dev->priv_flags |= IFF_DONT_BRIDGE; | |
835 | break; | |
074ac8df | 836 | case NL80211_IFTYPE_P2P_GO: |
ad4bb6f8 JB |
837 | case NL80211_IFTYPE_AP: |
838 | case NL80211_IFTYPE_AP_VLAN: | |
839 | case NL80211_IFTYPE_WDS: | |
840 | case NL80211_IFTYPE_MESH_POINT: | |
841 | /* bridging OK */ | |
842 | break; | |
843 | case NL80211_IFTYPE_MONITOR: | |
844 | /* monitor can't bridge anyway */ | |
845 | break; | |
846 | case NL80211_IFTYPE_UNSPECIFIED: | |
2e161f78 | 847 | case NUM_NL80211_IFTYPES: |
ad4bb6f8 JB |
848 | /* not happening */ |
849 | break; | |
850 | } | |
851 | } | |
852 | ||
3d54d255 JB |
853 | return err; |
854 | } | |
254416aa JL |
855 | |
856 | u16 cfg80211_calculate_bitrate(struct rate_info *rate) | |
857 | { | |
858 | int modulation, streams, bitrate; | |
859 | ||
860 | if (!(rate->flags & RATE_INFO_FLAGS_MCS)) | |
861 | return rate->legacy; | |
862 | ||
863 | /* the formula below does only work for MCS values smaller than 32 */ | |
864 | if (rate->mcs >= 32) | |
865 | return 0; | |
866 | ||
867 | modulation = rate->mcs & 7; | |
868 | streams = (rate->mcs >> 3) + 1; | |
869 | ||
870 | bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ? | |
871 | 13500000 : 6500000; | |
872 | ||
873 | if (modulation < 4) | |
874 | bitrate *= (modulation + 1); | |
875 | else if (modulation == 4) | |
876 | bitrate *= (modulation + 2); | |
877 | else | |
878 | bitrate *= (modulation + 3); | |
879 | ||
880 | bitrate *= streams; | |
881 | ||
882 | if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) | |
883 | bitrate = (bitrate / 9) * 10; | |
884 | ||
885 | /* do NOT round down here */ | |
886 | return (bitrate + 50000) / 100000; | |
887 | } |