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 | ||
59eb21a6 | 32 | int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band) |
8318d78a | 33 | { |
59eb21a6 BR |
34 | /* see 802.11 17.3.8.3.2 and Annex J |
35 | * there are overlapping channel numbers in 5GHz and 2GHz bands */ | |
36 | if (band == IEEE80211_BAND_5GHZ) { | |
37 | if (chan >= 182 && chan <= 196) | |
38 | return 4000 + chan * 5; | |
39 | else | |
40 | return 5000 + chan * 5; | |
41 | } else { /* IEEE80211_BAND_2GHZ */ | |
42 | if (chan == 14) | |
43 | return 2484; | |
44 | else if (chan < 14) | |
45 | return 2407 + chan * 5; | |
46 | else | |
47 | return 0; /* not supported */ | |
48 | } | |
8318d78a JB |
49 | } |
50 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); | |
51 | ||
52 | int ieee80211_frequency_to_channel(int freq) | |
53 | { | |
59eb21a6 | 54 | /* see 802.11 17.3.8.3.2 and Annex J */ |
8318d78a JB |
55 | if (freq == 2484) |
56 | return 14; | |
59eb21a6 | 57 | else if (freq < 2484) |
8318d78a | 58 | return (freq - 2407) / 5; |
59eb21a6 BR |
59 | else if (freq >= 4910 && freq <= 4980) |
60 | return (freq - 4000) / 5; | |
61 | else | |
62 | return (freq - 5000) / 5; | |
8318d78a JB |
63 | } |
64 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); | |
65 | ||
6c507cd0 JB |
66 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
67 | int freq) | |
906c730a JB |
68 | { |
69 | enum ieee80211_band band; | |
70 | struct ieee80211_supported_band *sband; | |
71 | int i; | |
72 | ||
73 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
74 | sband = wiphy->bands[band]; | |
75 | ||
76 | if (!sband) | |
77 | continue; | |
78 | ||
79 | for (i = 0; i < sband->n_channels; i++) { | |
80 | if (sband->channels[i].center_freq == freq) | |
81 | return &sband->channels[i]; | |
82 | } | |
83 | } | |
84 | ||
85 | return NULL; | |
86 | } | |
6c507cd0 | 87 | EXPORT_SYMBOL(__ieee80211_get_channel); |
906c730a | 88 | |
8318d78a JB |
89 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
90 | enum ieee80211_band band) | |
91 | { | |
92 | int i, want; | |
93 | ||
94 | switch (band) { | |
95 | case IEEE80211_BAND_5GHZ: | |
96 | want = 3; | |
97 | for (i = 0; i < sband->n_bitrates; i++) { | |
98 | if (sband->bitrates[i].bitrate == 60 || | |
99 | sband->bitrates[i].bitrate == 120 || | |
100 | sband->bitrates[i].bitrate == 240) { | |
101 | sband->bitrates[i].flags |= | |
102 | IEEE80211_RATE_MANDATORY_A; | |
103 | want--; | |
104 | } | |
105 | } | |
106 | WARN_ON(want); | |
107 | break; | |
108 | case IEEE80211_BAND_2GHZ: | |
109 | want = 7; | |
110 | for (i = 0; i < sband->n_bitrates; i++) { | |
111 | if (sband->bitrates[i].bitrate == 10) { | |
112 | sband->bitrates[i].flags |= | |
113 | IEEE80211_RATE_MANDATORY_B | | |
114 | IEEE80211_RATE_MANDATORY_G; | |
115 | want--; | |
116 | } | |
117 | ||
118 | if (sband->bitrates[i].bitrate == 20 || | |
119 | sband->bitrates[i].bitrate == 55 || | |
120 | sband->bitrates[i].bitrate == 110 || | |
121 | sband->bitrates[i].bitrate == 60 || | |
122 | sband->bitrates[i].bitrate == 120 || | |
123 | sband->bitrates[i].bitrate == 240) { | |
124 | sband->bitrates[i].flags |= | |
125 | IEEE80211_RATE_MANDATORY_G; | |
126 | want--; | |
127 | } | |
128 | ||
aac09fbf JB |
129 | if (sband->bitrates[i].bitrate != 10 && |
130 | sband->bitrates[i].bitrate != 20 && | |
131 | sband->bitrates[i].bitrate != 55 && | |
132 | sband->bitrates[i].bitrate != 110) | |
8318d78a JB |
133 | sband->bitrates[i].flags |= |
134 | IEEE80211_RATE_ERP_G; | |
135 | } | |
406f2388 | 136 | WARN_ON(want != 0 && want != 3 && want != 6); |
8318d78a JB |
137 | break; |
138 | case IEEE80211_NUM_BANDS: | |
139 | WARN_ON(1); | |
140 | break; | |
141 | } | |
142 | } | |
143 | ||
144 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) | |
145 | { | |
146 | enum ieee80211_band band; | |
147 | ||
148 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
149 | if (wiphy->bands[band]) | |
150 | set_mandatory_flags_band(wiphy->bands[band], band); | |
151 | } | |
08645126 | 152 | |
fffd0934 JB |
153 | int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, |
154 | struct key_params *params, int key_idx, | |
e31b8213 | 155 | bool pairwise, const u8 *mac_addr) |
08645126 | 156 | { |
fffd0934 JB |
157 | int i; |
158 | ||
08645126 JB |
159 | if (key_idx > 5) |
160 | return -EINVAL; | |
161 | ||
e31b8213 JB |
162 | if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)) |
163 | return -EINVAL; | |
164 | ||
165 | if (pairwise && !mac_addr) | |
166 | return -EINVAL; | |
167 | ||
08645126 JB |
168 | /* |
169 | * Disallow pairwise keys with non-zero index unless it's WEP | |
45cbad6a JO |
170 | * or a vendor specific cipher (because current deployments use |
171 | * pairwise WEP keys with non-zero indices and for vendor specific | |
172 | * ciphers this should be validated in the driver or hardware level | |
173 | * - but 802.11i clearly specifies to use zero) | |
08645126 | 174 | */ |
e31b8213 | 175 | if (pairwise && key_idx && |
45cbad6a JO |
176 | ((params->cipher == WLAN_CIPHER_SUITE_TKIP) || |
177 | (params->cipher == WLAN_CIPHER_SUITE_CCMP) || | |
178 | (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC))) | |
08645126 JB |
179 | return -EINVAL; |
180 | ||
08645126 JB |
181 | switch (params->cipher) { |
182 | case WLAN_CIPHER_SUITE_WEP40: | |
8fc0fee0 | 183 | if (params->key_len != WLAN_KEY_LEN_WEP40) |
08645126 JB |
184 | return -EINVAL; |
185 | break; | |
186 | case WLAN_CIPHER_SUITE_TKIP: | |
8fc0fee0 | 187 | if (params->key_len != WLAN_KEY_LEN_TKIP) |
08645126 JB |
188 | return -EINVAL; |
189 | break; | |
190 | case WLAN_CIPHER_SUITE_CCMP: | |
8fc0fee0 | 191 | if (params->key_len != WLAN_KEY_LEN_CCMP) |
08645126 JB |
192 | return -EINVAL; |
193 | break; | |
194 | case WLAN_CIPHER_SUITE_WEP104: | |
8fc0fee0 | 195 | if (params->key_len != WLAN_KEY_LEN_WEP104) |
08645126 JB |
196 | return -EINVAL; |
197 | break; | |
198 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
8fc0fee0 | 199 | if (params->key_len != WLAN_KEY_LEN_AES_CMAC) |
08645126 JB |
200 | return -EINVAL; |
201 | break; | |
202 | default: | |
7d64b7cc JB |
203 | /* |
204 | * We don't know anything about this algorithm, | |
205 | * allow using it -- but the driver must check | |
206 | * all parameters! We still check below whether | |
207 | * or not the driver supports this algorithm, | |
208 | * of course. | |
209 | */ | |
210 | break; | |
08645126 JB |
211 | } |
212 | ||
9f26a952 JM |
213 | if (params->seq) { |
214 | switch (params->cipher) { | |
215 | case WLAN_CIPHER_SUITE_WEP40: | |
216 | case WLAN_CIPHER_SUITE_WEP104: | |
217 | /* These ciphers do not use key sequence */ | |
218 | return -EINVAL; | |
219 | case WLAN_CIPHER_SUITE_TKIP: | |
220 | case WLAN_CIPHER_SUITE_CCMP: | |
221 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
222 | if (params->seq_len != 6) | |
223 | return -EINVAL; | |
224 | break; | |
225 | } | |
226 | } | |
227 | ||
fffd0934 JB |
228 | for (i = 0; i < rdev->wiphy.n_cipher_suites; i++) |
229 | if (params->cipher == rdev->wiphy.cipher_suites[i]) | |
230 | break; | |
231 | if (i == rdev->wiphy.n_cipher_suites) | |
232 | return -EINVAL; | |
233 | ||
08645126 JB |
234 | return 0; |
235 | } | |
e31a16d6 ZY |
236 | |
237 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
238 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
239 | const unsigned char rfc1042_header[] __aligned(2) = | |
240 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
241 | EXPORT_SYMBOL(rfc1042_header); | |
242 | ||
243 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
244 | const unsigned char bridge_tunnel_header[] __aligned(2) = | |
245 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
246 | EXPORT_SYMBOL(bridge_tunnel_header); | |
247 | ||
633adf1a | 248 | unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc) |
e31a16d6 ZY |
249 | { |
250 | unsigned int hdrlen = 24; | |
251 | ||
252 | if (ieee80211_is_data(fc)) { | |
253 | if (ieee80211_has_a4(fc)) | |
254 | hdrlen = 30; | |
d0dd2de0 | 255 | if (ieee80211_is_data_qos(fc)) { |
e31a16d6 | 256 | hdrlen += IEEE80211_QOS_CTL_LEN; |
d0dd2de0 AT |
257 | if (ieee80211_has_order(fc)) |
258 | hdrlen += IEEE80211_HT_CTL_LEN; | |
259 | } | |
e31a16d6 ZY |
260 | goto out; |
261 | } | |
262 | ||
263 | if (ieee80211_is_ctl(fc)) { | |
264 | /* | |
265 | * ACK and CTS are 10 bytes, all others 16. To see how | |
266 | * to get this condition consider | |
267 | * subtype mask: 0b0000000011110000 (0x00F0) | |
268 | * ACK subtype: 0b0000000011010000 (0x00D0) | |
269 | * CTS subtype: 0b0000000011000000 (0x00C0) | |
270 | * bits that matter: ^^^ (0x00E0) | |
271 | * value of those: 0b0000000011000000 (0x00C0) | |
272 | */ | |
273 | if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) | |
274 | hdrlen = 10; | |
275 | else | |
276 | hdrlen = 16; | |
277 | } | |
278 | out: | |
279 | return hdrlen; | |
280 | } | |
281 | EXPORT_SYMBOL(ieee80211_hdrlen); | |
282 | ||
283 | unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) | |
284 | { | |
285 | const struct ieee80211_hdr *hdr = | |
286 | (const struct ieee80211_hdr *)skb->data; | |
287 | unsigned int hdrlen; | |
288 | ||
289 | if (unlikely(skb->len < 10)) | |
290 | return 0; | |
291 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
292 | if (unlikely(hdrlen > skb->len)) | |
293 | return 0; | |
294 | return hdrlen; | |
295 | } | |
296 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); | |
297 | ||
60fd2b67 | 298 | static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) |
e31a16d6 ZY |
299 | { |
300 | int ae = meshhdr->flags & MESH_FLAGS_AE; | |
301 | /* 7.1.3.5a.2 */ | |
302 | switch (ae) { | |
303 | case 0: | |
304 | return 6; | |
3c5772a5 | 305 | case MESH_FLAGS_AE_A4: |
e31a16d6 | 306 | return 12; |
3c5772a5 | 307 | case MESH_FLAGS_AE_A5_A6: |
e31a16d6 | 308 | return 18; |
3c5772a5 | 309 | case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): |
e31a16d6 ZY |
310 | return 24; |
311 | default: | |
312 | return 6; | |
313 | } | |
314 | } | |
315 | ||
eaf85ca7 | 316 | int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
317 | enum nl80211_iftype iftype) |
318 | { | |
319 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
320 | u16 hdrlen, ethertype; | |
321 | u8 *payload; | |
322 | u8 dst[ETH_ALEN]; | |
323 | u8 src[ETH_ALEN] __aligned(2); | |
324 | ||
325 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) | |
326 | return -1; | |
327 | ||
328 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
329 | ||
330 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
331 | * header | |
332 | * IEEE 802.11 address fields: | |
333 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
334 | * 0 0 DA SA BSSID n/a | |
335 | * 0 1 DA BSSID SA n/a | |
336 | * 1 0 BSSID SA DA n/a | |
337 | * 1 1 RA TA DA SA | |
338 | */ | |
339 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); | |
340 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
341 | ||
342 | switch (hdr->frame_control & | |
343 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
344 | case cpu_to_le16(IEEE80211_FCTL_TODS): | |
345 | if (unlikely(iftype != NL80211_IFTYPE_AP && | |
074ac8df JB |
346 | iftype != NL80211_IFTYPE_AP_VLAN && |
347 | iftype != NL80211_IFTYPE_P2P_GO)) | |
e31a16d6 ZY |
348 | return -1; |
349 | break; | |
350 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
351 | if (unlikely(iftype != NL80211_IFTYPE_WDS && | |
f14543ee FF |
352 | iftype != NL80211_IFTYPE_MESH_POINT && |
353 | iftype != NL80211_IFTYPE_AP_VLAN && | |
354 | iftype != NL80211_IFTYPE_STATION)) | |
e31a16d6 ZY |
355 | return -1; |
356 | if (iftype == NL80211_IFTYPE_MESH_POINT) { | |
357 | struct ieee80211s_hdr *meshdr = | |
358 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
359 | /* make sure meshdr->flags is on the linear part */ |
360 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
361 | return -1; | |
e31a16d6 | 362 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { |
e3cf8b3f ZY |
363 | skb_copy_bits(skb, hdrlen + |
364 | offsetof(struct ieee80211s_hdr, eaddr1), | |
365 | dst, ETH_ALEN); | |
366 | skb_copy_bits(skb, hdrlen + | |
367 | offsetof(struct ieee80211s_hdr, eaddr2), | |
368 | src, ETH_ALEN); | |
e31a16d6 | 369 | } |
e3cf8b3f | 370 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); |
e31a16d6 ZY |
371 | } |
372 | break; | |
373 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): | |
3c5772a5 | 374 | if ((iftype != NL80211_IFTYPE_STATION && |
074ac8df JB |
375 | iftype != NL80211_IFTYPE_P2P_CLIENT && |
376 | iftype != NL80211_IFTYPE_MESH_POINT) || | |
e31a16d6 ZY |
377 | (is_multicast_ether_addr(dst) && |
378 | !compare_ether_addr(src, addr))) | |
379 | return -1; | |
3c5772a5 JC |
380 | if (iftype == NL80211_IFTYPE_MESH_POINT) { |
381 | struct ieee80211s_hdr *meshdr = | |
382 | (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
e3cf8b3f ZY |
383 | /* make sure meshdr->flags is on the linear part */ |
384 | if (!pskb_may_pull(skb, hdrlen + 1)) | |
385 | return -1; | |
3c5772a5 | 386 | if (meshdr->flags & MESH_FLAGS_AE_A4) |
e3cf8b3f ZY |
387 | skb_copy_bits(skb, hdrlen + |
388 | offsetof(struct ieee80211s_hdr, eaddr1), | |
389 | src, ETH_ALEN); | |
390 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
3c5772a5 | 391 | } |
e31a16d6 ZY |
392 | break; |
393 | case cpu_to_le16(0): | |
394 | if (iftype != NL80211_IFTYPE_ADHOC) | |
395 | return -1; | |
396 | break; | |
397 | } | |
398 | ||
e3cf8b3f | 399 | if (!pskb_may_pull(skb, hdrlen + 8)) |
e31a16d6 ZY |
400 | return -1; |
401 | ||
402 | payload = skb->data + hdrlen; | |
403 | ethertype = (payload[6] << 8) | payload[7]; | |
404 | ||
405 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
406 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
407 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
408 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
409 | * replace EtherType */ | |
410 | skb_pull(skb, hdrlen + 6); | |
411 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
412 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
413 | } else { | |
414 | struct ethhdr *ehdr; | |
415 | __be16 len; | |
416 | ||
417 | skb_pull(skb, hdrlen); | |
418 | len = htons(skb->len); | |
419 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
420 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
421 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
422 | ehdr->h_proto = len; | |
423 | } | |
424 | return 0; | |
425 | } | |
426 | EXPORT_SYMBOL(ieee80211_data_to_8023); | |
427 | ||
eaf85ca7 | 428 | int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, |
e31a16d6 ZY |
429 | enum nl80211_iftype iftype, u8 *bssid, bool qos) |
430 | { | |
431 | struct ieee80211_hdr hdr; | |
432 | u16 hdrlen, ethertype; | |
433 | __le16 fc; | |
434 | const u8 *encaps_data; | |
435 | int encaps_len, skip_header_bytes; | |
436 | int nh_pos, h_pos; | |
437 | int head_need; | |
438 | ||
439 | if (unlikely(skb->len < ETH_HLEN)) | |
440 | return -EINVAL; | |
441 | ||
442 | nh_pos = skb_network_header(skb) - skb->data; | |
443 | h_pos = skb_transport_header(skb) - skb->data; | |
444 | ||
445 | /* convert Ethernet header to proper 802.11 header (based on | |
446 | * operation mode) */ | |
447 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
448 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); | |
449 | ||
450 | switch (iftype) { | |
451 | case NL80211_IFTYPE_AP: | |
452 | case NL80211_IFTYPE_AP_VLAN: | |
074ac8df | 453 | case NL80211_IFTYPE_P2P_GO: |
e31a16d6 ZY |
454 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
455 | /* DA BSSID SA */ | |
456 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
457 | memcpy(hdr.addr2, addr, ETH_ALEN); | |
458 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
459 | hdrlen = 24; | |
460 | break; | |
461 | case NL80211_IFTYPE_STATION: | |
074ac8df | 462 | case NL80211_IFTYPE_P2P_CLIENT: |
e31a16d6 ZY |
463 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
464 | /* BSSID SA DA */ | |
465 | memcpy(hdr.addr1, bssid, ETH_ALEN); | |
466 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
467 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
468 | hdrlen = 24; | |
469 | break; | |
470 | case NL80211_IFTYPE_ADHOC: | |
471 | /* DA SA BSSID */ | |
472 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
473 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
474 | memcpy(hdr.addr3, bssid, ETH_ALEN); | |
475 | hdrlen = 24; | |
476 | break; | |
477 | default: | |
478 | return -EOPNOTSUPP; | |
479 | } | |
480 | ||
481 | if (qos) { | |
482 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
483 | hdrlen += 2; | |
484 | } | |
485 | ||
486 | hdr.frame_control = fc; | |
487 | hdr.duration_id = 0; | |
488 | hdr.seq_ctrl = 0; | |
489 | ||
490 | skip_header_bytes = ETH_HLEN; | |
491 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
492 | encaps_data = bridge_tunnel_header; | |
493 | encaps_len = sizeof(bridge_tunnel_header); | |
494 | skip_header_bytes -= 2; | |
495 | } else if (ethertype > 0x600) { | |
496 | encaps_data = rfc1042_header; | |
497 | encaps_len = sizeof(rfc1042_header); | |
498 | skip_header_bytes -= 2; | |
499 | } else { | |
500 | encaps_data = NULL; | |
501 | encaps_len = 0; | |
502 | } | |
503 | ||
504 | skb_pull(skb, skip_header_bytes); | |
505 | nh_pos -= skip_header_bytes; | |
506 | h_pos -= skip_header_bytes; | |
507 | ||
508 | head_need = hdrlen + encaps_len - skb_headroom(skb); | |
509 | ||
510 | if (head_need > 0 || skb_cloned(skb)) { | |
511 | head_need = max(head_need, 0); | |
512 | if (head_need) | |
513 | skb_orphan(skb); | |
514 | ||
515 | if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) { | |
e9c0268f | 516 | pr_err("failed to reallocate Tx buffer\n"); |
e31a16d6 ZY |
517 | return -ENOMEM; |
518 | } | |
519 | skb->truesize += head_need; | |
520 | } | |
521 | ||
522 | if (encaps_data) { | |
523 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
524 | nh_pos += encaps_len; | |
525 | h_pos += encaps_len; | |
526 | } | |
527 | ||
528 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
529 | ||
530 | nh_pos += hdrlen; | |
531 | h_pos += hdrlen; | |
532 | ||
533 | /* Update skb pointers to various headers since this modified frame | |
534 | * is going to go through Linux networking code that may potentially | |
535 | * need things like pointer to IP header. */ | |
536 | skb_set_mac_header(skb, 0); | |
537 | skb_set_network_header(skb, nh_pos); | |
538 | skb_set_transport_header(skb, h_pos); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | EXPORT_SYMBOL(ieee80211_data_from_8023); | |
543 | ||
eaf85ca7 ZY |
544 | |
545 | void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, | |
546 | const u8 *addr, enum nl80211_iftype iftype, | |
8b3becad YAP |
547 | const unsigned int extra_headroom, |
548 | bool has_80211_header) | |
eaf85ca7 ZY |
549 | { |
550 | struct sk_buff *frame = NULL; | |
551 | u16 ethertype; | |
552 | u8 *payload; | |
553 | const struct ethhdr *eth; | |
554 | int remaining, err; | |
555 | u8 dst[ETH_ALEN], src[ETH_ALEN]; | |
556 | ||
8b3becad YAP |
557 | if (has_80211_header) { |
558 | err = ieee80211_data_to_8023(skb, addr, iftype); | |
559 | if (err) | |
560 | goto out; | |
eaf85ca7 | 561 | |
8b3becad YAP |
562 | /* skip the wrapping header */ |
563 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
564 | if (!eth) | |
565 | goto out; | |
566 | } else { | |
567 | eth = (struct ethhdr *) skb->data; | |
568 | } | |
eaf85ca7 ZY |
569 | |
570 | while (skb != frame) { | |
571 | u8 padding; | |
572 | __be16 len = eth->h_proto; | |
573 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
574 | ||
575 | remaining = skb->len; | |
576 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
577 | memcpy(src, eth->h_source, ETH_ALEN); | |
578 | ||
579 | padding = (4 - subframe_len) & 0x3; | |
580 | /* the last MSDU has no padding */ | |
581 | if (subframe_len > remaining) | |
582 | goto purge; | |
583 | ||
584 | skb_pull(skb, sizeof(struct ethhdr)); | |
585 | /* reuse skb for the last subframe */ | |
586 | if (remaining <= subframe_len + padding) | |
587 | frame = skb; | |
588 | else { | |
589 | unsigned int hlen = ALIGN(extra_headroom, 4); | |
590 | /* | |
591 | * Allocate and reserve two bytes more for payload | |
592 | * alignment since sizeof(struct ethhdr) is 14. | |
593 | */ | |
594 | frame = dev_alloc_skb(hlen + subframe_len + 2); | |
595 | if (!frame) | |
596 | goto purge; | |
597 | ||
598 | skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); | |
599 | memcpy(skb_put(frame, ntohs(len)), skb->data, | |
600 | ntohs(len)); | |
601 | ||
602 | eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + | |
603 | padding); | |
604 | if (!eth) { | |
605 | dev_kfree_skb(frame); | |
606 | goto purge; | |
607 | } | |
608 | } | |
609 | ||
610 | skb_reset_network_header(frame); | |
611 | frame->dev = skb->dev; | |
612 | frame->priority = skb->priority; | |
613 | ||
614 | payload = frame->data; | |
615 | ethertype = (payload[6] << 8) | payload[7]; | |
616 | ||
617 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
618 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
619 | compare_ether_addr(payload, | |
620 | bridge_tunnel_header) == 0)) { | |
621 | /* remove RFC1042 or Bridge-Tunnel | |
622 | * encapsulation and replace EtherType */ | |
623 | skb_pull(frame, 6); | |
624 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
625 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
626 | } else { | |
627 | memcpy(skb_push(frame, sizeof(__be16)), &len, | |
628 | sizeof(__be16)); | |
629 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
630 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
631 | } | |
632 | __skb_queue_tail(list, frame); | |
633 | } | |
634 | ||
635 | return; | |
636 | ||
637 | purge: | |
638 | __skb_queue_purge(list); | |
639 | out: | |
640 | dev_kfree_skb(skb); | |
641 | } | |
642 | EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); | |
643 | ||
e31a16d6 ZY |
644 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
645 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) | |
646 | { | |
647 | unsigned int dscp; | |
648 | ||
649 | /* skb->priority values from 256->263 are magic values to | |
650 | * directly indicate a specific 802.1d priority. This is used | |
651 | * to allow 802.1d priority to be passed directly in from VLAN | |
652 | * tags, etc. | |
653 | */ | |
654 | if (skb->priority >= 256 && skb->priority <= 263) | |
655 | return skb->priority - 256; | |
656 | ||
657 | switch (skb->protocol) { | |
658 | case htons(ETH_P_IP): | |
659 | dscp = ip_hdr(skb)->tos & 0xfc; | |
660 | break; | |
661 | default: | |
662 | return 0; | |
663 | } | |
664 | ||
665 | return dscp >> 5; | |
666 | } | |
667 | EXPORT_SYMBOL(cfg80211_classify8021d); | |
517357c6 JB |
668 | |
669 | const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) | |
670 | { | |
671 | u8 *end, *pos; | |
672 | ||
673 | pos = bss->information_elements; | |
674 | if (pos == NULL) | |
675 | return NULL; | |
676 | end = pos + bss->len_information_elements; | |
677 | ||
678 | while (pos + 1 < end) { | |
679 | if (pos + 2 + pos[1] > end) | |
680 | break; | |
681 | if (pos[0] == ie) | |
682 | return pos; | |
683 | pos += 2 + pos[1]; | |
684 | } | |
685 | ||
686 | return NULL; | |
687 | } | |
688 | EXPORT_SYMBOL(ieee80211_bss_get_ie); | |
fffd0934 JB |
689 | |
690 | void cfg80211_upload_connect_keys(struct wireless_dev *wdev) | |
691 | { | |
692 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); | |
693 | struct net_device *dev = wdev->netdev; | |
694 | int i; | |
695 | ||
696 | if (!wdev->connect_keys) | |
697 | return; | |
698 | ||
699 | for (i = 0; i < 6; i++) { | |
700 | if (!wdev->connect_keys->params[i].cipher) | |
701 | continue; | |
e31b8213 | 702 | if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL, |
1e056665 | 703 | &wdev->connect_keys->params[i])) { |
e9c0268f | 704 | netdev_err(dev, "failed to set key %d\n", i); |
1e056665 ZY |
705 | continue; |
706 | } | |
fffd0934 | 707 | if (wdev->connect_keys->def == i) |
dbd2fd65 JB |
708 | if (rdev->ops->set_default_key(wdev->wiphy, dev, |
709 | i, true, true)) { | |
e9c0268f | 710 | netdev_err(dev, "failed to set defkey %d\n", i); |
1e056665 ZY |
711 | continue; |
712 | } | |
fffd0934 JB |
713 | if (wdev->connect_keys->defmgmt == i) |
714 | if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i)) | |
e9c0268f | 715 | netdev_err(dev, "failed to set mgtdef %d\n", i); |
fffd0934 JB |
716 | } |
717 | ||
718 | kfree(wdev->connect_keys); | |
719 | wdev->connect_keys = NULL; | |
720 | } | |
3d54d255 JB |
721 | |
722 | static void cfg80211_process_wdev_events(struct wireless_dev *wdev) | |
723 | { | |
724 | struct cfg80211_event *ev; | |
725 | unsigned long flags; | |
726 | const u8 *bssid = NULL; | |
727 | ||
728 | spin_lock_irqsave(&wdev->event_lock, flags); | |
729 | while (!list_empty(&wdev->event_list)) { | |
730 | ev = list_first_entry(&wdev->event_list, | |
731 | struct cfg80211_event, list); | |
732 | list_del(&ev->list); | |
733 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
734 | ||
735 | wdev_lock(wdev); | |
736 | switch (ev->type) { | |
737 | case EVENT_CONNECT_RESULT: | |
738 | if (!is_zero_ether_addr(ev->cr.bssid)) | |
739 | bssid = ev->cr.bssid; | |
740 | __cfg80211_connect_result( | |
741 | wdev->netdev, bssid, | |
742 | ev->cr.req_ie, ev->cr.req_ie_len, | |
743 | ev->cr.resp_ie, ev->cr.resp_ie_len, | |
744 | ev->cr.status, | |
745 | ev->cr.status == WLAN_STATUS_SUCCESS, | |
746 | NULL); | |
747 | break; | |
748 | case EVENT_ROAMED: | |
749 | __cfg80211_roamed(wdev, ev->rm.bssid, | |
750 | ev->rm.req_ie, ev->rm.req_ie_len, | |
751 | ev->rm.resp_ie, ev->rm.resp_ie_len); | |
752 | break; | |
753 | case EVENT_DISCONNECTED: | |
754 | __cfg80211_disconnected(wdev->netdev, | |
755 | ev->dc.ie, ev->dc.ie_len, | |
756 | ev->dc.reason, true); | |
757 | break; | |
758 | case EVENT_IBSS_JOINED: | |
759 | __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid); | |
760 | break; | |
761 | } | |
762 | wdev_unlock(wdev); | |
763 | ||
764 | kfree(ev); | |
765 | ||
766 | spin_lock_irqsave(&wdev->event_lock, flags); | |
767 | } | |
768 | spin_unlock_irqrestore(&wdev->event_lock, flags); | |
769 | } | |
770 | ||
771 | void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) | |
772 | { | |
773 | struct wireless_dev *wdev; | |
774 | ||
775 | ASSERT_RTNL(); | |
776 | ASSERT_RDEV_LOCK(rdev); | |
777 | ||
778 | mutex_lock(&rdev->devlist_mtx); | |
779 | ||
780 | list_for_each_entry(wdev, &rdev->netdev_list, list) | |
781 | cfg80211_process_wdev_events(wdev); | |
782 | ||
783 | mutex_unlock(&rdev->devlist_mtx); | |
784 | } | |
785 | ||
786 | int cfg80211_change_iface(struct cfg80211_registered_device *rdev, | |
787 | struct net_device *dev, enum nl80211_iftype ntype, | |
788 | u32 *flags, struct vif_params *params) | |
789 | { | |
790 | int err; | |
791 | enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; | |
792 | ||
793 | ASSERT_RDEV_LOCK(rdev); | |
794 | ||
795 | /* don't support changing VLANs, you just re-create them */ | |
796 | if (otype == NL80211_IFTYPE_AP_VLAN) | |
797 | return -EOPNOTSUPP; | |
798 | ||
799 | if (!rdev->ops->change_virtual_intf || | |
800 | !(rdev->wiphy.interface_modes & (1 << ntype))) | |
801 | return -EOPNOTSUPP; | |
802 | ||
ad4bb6f8 | 803 | /* if it's part of a bridge, reject changing type to station/ibss */ |
f350a0a8 | 804 | if ((dev->priv_flags & IFF_BRIDGE_PORT) && |
074ac8df JB |
805 | (ntype == NL80211_IFTYPE_ADHOC || |
806 | ntype == NL80211_IFTYPE_STATION || | |
807 | ntype == NL80211_IFTYPE_P2P_CLIENT)) | |
ad4bb6f8 JB |
808 | return -EBUSY; |
809 | ||
3d54d255 | 810 | if (ntype != otype) { |
7527a782 JB |
811 | err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr, |
812 | ntype); | |
813 | if (err) | |
814 | return err; | |
815 | ||
9bc383de | 816 | dev->ieee80211_ptr->use_4addr = false; |
29cbe68c | 817 | dev->ieee80211_ptr->mesh_id_up_len = 0; |
9bc383de | 818 | |
3d54d255 JB |
819 | switch (otype) { |
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 */ | |
885 | if (rate->mcs >= 32) | |
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 | } | |
56d1893d JB |
909 | |
910 | int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev, | |
911 | u32 beacon_int) | |
912 | { | |
913 | struct wireless_dev *wdev; | |
914 | int res = 0; | |
915 | ||
916 | if (!beacon_int) | |
917 | return -EINVAL; | |
918 | ||
919 | mutex_lock(&rdev->devlist_mtx); | |
920 | ||
921 | list_for_each_entry(wdev, &rdev->netdev_list, list) { | |
922 | if (!wdev->beacon_interval) | |
923 | continue; | |
924 | if (wdev->beacon_interval != beacon_int) { | |
925 | res = -EINVAL; | |
926 | break; | |
927 | } | |
928 | } | |
929 | ||
930 | mutex_unlock(&rdev->devlist_mtx); | |
931 | ||
932 | return res; | |
933 | } | |
7527a782 JB |
934 | |
935 | int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev, | |
936 | struct wireless_dev *wdev, | |
937 | enum nl80211_iftype iftype) | |
938 | { | |
939 | struct wireless_dev *wdev_iter; | |
940 | int num[NUM_NL80211_IFTYPES]; | |
941 | int total = 1; | |
942 | int i, j; | |
943 | ||
944 | ASSERT_RTNL(); | |
945 | ||
946 | /* Always allow software iftypes */ | |
947 | if (rdev->wiphy.software_iftypes & BIT(iftype)) | |
948 | return 0; | |
949 | ||
950 | /* | |
951 | * Drivers will gradually all set this flag, until all | |
952 | * have it we only enforce for those that set it. | |
953 | */ | |
954 | if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS)) | |
955 | return 0; | |
956 | ||
957 | memset(num, 0, sizeof(num)); | |
958 | ||
959 | num[iftype] = 1; | |
960 | ||
961 | mutex_lock(&rdev->devlist_mtx); | |
962 | list_for_each_entry(wdev_iter, &rdev->netdev_list, list) { | |
963 | if (wdev_iter == wdev) | |
964 | continue; | |
965 | if (!netif_running(wdev_iter->netdev)) | |
966 | continue; | |
967 | ||
968 | if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype)) | |
969 | continue; | |
970 | ||
971 | num[wdev_iter->iftype]++; | |
972 | total++; | |
973 | } | |
974 | mutex_unlock(&rdev->devlist_mtx); | |
975 | ||
976 | for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) { | |
977 | const struct ieee80211_iface_combination *c; | |
978 | struct ieee80211_iface_limit *limits; | |
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++) { | |
993 | if (!(limits[j].types & iftype)) | |
994 | continue; | |
995 | if (limits[j].max < num[iftype]) | |
996 | goto cont; | |
997 | limits[j].max -= num[iftype]; | |
998 | } | |
999 | } | |
1000 | /* yay, it fits */ | |
1001 | kfree(limits); | |
1002 | return 0; | |
1003 | cont: | |
1004 | kfree(limits); | |
1005 | } | |
1006 | ||
1007 | return -EBUSY; | |
1008 | } |