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c2d1560a JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * utilities for mac80211 | |
12 | */ | |
13 | ||
14 | #include <net/mac80211.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/if_arp.h> | |
21 | #include <linux/wireless.h> | |
22 | #include <linux/bitmap.h> | |
881d966b | 23 | #include <net/net_namespace.h> |
c2d1560a | 24 | #include <net/cfg80211.h> |
dabeb344 | 25 | #include <net/rtnetlink.h> |
c2d1560a JB |
26 | |
27 | #include "ieee80211_i.h" | |
28 | #include "ieee80211_rate.h" | |
29 | #include "wme.h" | |
30 | ||
31 | /* privid for wiphys to determine whether they belong to us or not */ | |
32 | void *mac80211_wiphy_privid = &mac80211_wiphy_privid; | |
33 | ||
34 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
35 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
36 | const unsigned char rfc1042_header[] = | |
37 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
38 | ||
39 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
40 | const unsigned char bridge_tunnel_header[] = | |
41 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
42 | ||
c2d1560a | 43 | |
71364716 RR |
44 | u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len, |
45 | enum ieee80211_if_types type) | |
c2d1560a JB |
46 | { |
47 | u16 fc; | |
48 | ||
98f0b0a3 RR |
49 | /* drop ACK/CTS frames and incorrect hdr len (ctrl) */ |
50 | if (len < 16) | |
c2d1560a JB |
51 | return NULL; |
52 | ||
53 | fc = le16_to_cpu(hdr->frame_control); | |
54 | ||
55 | switch (fc & IEEE80211_FCTL_FTYPE) { | |
56 | case IEEE80211_FTYPE_DATA: | |
98f0b0a3 RR |
57 | if (len < 24) /* drop incorrect hdr len (data) */ |
58 | return NULL; | |
c2d1560a JB |
59 | switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { |
60 | case IEEE80211_FCTL_TODS: | |
61 | return hdr->addr1; | |
62 | case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): | |
63 | return NULL; | |
64 | case IEEE80211_FCTL_FROMDS: | |
65 | return hdr->addr2; | |
66 | case 0: | |
67 | return hdr->addr3; | |
68 | } | |
69 | break; | |
70 | case IEEE80211_FTYPE_MGMT: | |
98f0b0a3 RR |
71 | if (len < 24) /* drop incorrect hdr len (mgmt) */ |
72 | return NULL; | |
c2d1560a JB |
73 | return hdr->addr3; |
74 | case IEEE80211_FTYPE_CTL: | |
75 | if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL) | |
76 | return hdr->addr1; | |
71364716 RR |
77 | else if ((fc & IEEE80211_FCTL_STYPE) == |
78 | IEEE80211_STYPE_BACK_REQ) { | |
79 | switch (type) { | |
80 | case IEEE80211_IF_TYPE_STA: | |
81 | return hdr->addr2; | |
82 | case IEEE80211_IF_TYPE_AP: | |
83 | case IEEE80211_IF_TYPE_VLAN: | |
84 | return hdr->addr1; | |
85 | default: | |
86 | return NULL; | |
87 | } | |
88 | } | |
c2d1560a JB |
89 | else |
90 | return NULL; | |
91 | } | |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
96 | int ieee80211_get_hdrlen(u16 fc) | |
97 | { | |
98 | int hdrlen = 24; | |
99 | ||
100 | switch (fc & IEEE80211_FCTL_FTYPE) { | |
101 | case IEEE80211_FTYPE_DATA: | |
102 | if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS)) | |
103 | hdrlen = 30; /* Addr4 */ | |
104 | /* | |
105 | * The QoS Control field is two bytes and its presence is | |
106 | * indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to | |
107 | * hdrlen if that bit is set. | |
108 | * This works by masking out the bit and shifting it to | |
109 | * bit position 1 so the result has the value 0 or 2. | |
110 | */ | |
111 | hdrlen += (fc & IEEE80211_STYPE_QOS_DATA) | |
112 | >> (ilog2(IEEE80211_STYPE_QOS_DATA)-1); | |
113 | break; | |
114 | case IEEE80211_FTYPE_CTL: | |
115 | /* | |
116 | * ACK and CTS are 10 bytes, all others 16. To see how | |
117 | * to get this condition consider | |
118 | * subtype mask: 0b0000000011110000 (0x00F0) | |
119 | * ACK subtype: 0b0000000011010000 (0x00D0) | |
120 | * CTS subtype: 0b0000000011000000 (0x00C0) | |
121 | * bits that matter: ^^^ (0x00E0) | |
122 | * value of those: 0b0000000011000000 (0x00C0) | |
123 | */ | |
124 | if ((fc & 0xE0) == 0xC0) | |
125 | hdrlen = 10; | |
126 | else | |
127 | hdrlen = 16; | |
128 | break; | |
129 | } | |
130 | ||
131 | return hdrlen; | |
132 | } | |
133 | EXPORT_SYMBOL(ieee80211_get_hdrlen); | |
134 | ||
135 | int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) | |
136 | { | |
137 | const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data; | |
138 | int hdrlen; | |
139 | ||
140 | if (unlikely(skb->len < 10)) | |
141 | return 0; | |
142 | hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)); | |
143 | if (unlikely(hdrlen > skb->len)) | |
144 | return 0; | |
145 | return hdrlen; | |
146 | } | |
147 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); | |
148 | ||
c2d1560a JB |
149 | void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx) |
150 | { | |
151 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; | |
152 | ||
153 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
154 | if (tx->u.tx.extra_frag) { | |
155 | struct ieee80211_hdr *fhdr; | |
156 | int i; | |
157 | for (i = 0; i < tx->u.tx.num_extra_frag; i++) { | |
158 | fhdr = (struct ieee80211_hdr *) | |
159 | tx->u.tx.extra_frag[i]->data; | |
160 | fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
161 | } | |
162 | } | |
163 | } | |
164 | ||
165 | int ieee80211_frame_duration(struct ieee80211_local *local, size_t len, | |
166 | int rate, int erp, int short_preamble) | |
167 | { | |
168 | int dur; | |
169 | ||
170 | /* calculate duration (in microseconds, rounded up to next higher | |
171 | * integer if it includes a fractional microsecond) to send frame of | |
172 | * len bytes (does not include FCS) at the given rate. Duration will | |
173 | * also include SIFS. | |
174 | * | |
175 | * rate is in 100 kbps, so divident is multiplied by 10 in the | |
176 | * DIV_ROUND_UP() operations. | |
177 | */ | |
178 | ||
8318d78a | 179 | if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) { |
c2d1560a JB |
180 | /* |
181 | * OFDM: | |
182 | * | |
183 | * N_DBPS = DATARATE x 4 | |
184 | * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS) | |
185 | * (16 = SIGNAL time, 6 = tail bits) | |
186 | * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext | |
187 | * | |
188 | * T_SYM = 4 usec | |
189 | * 802.11a - 17.5.2: aSIFSTime = 16 usec | |
190 | * 802.11g - 19.8.4: aSIFSTime = 10 usec + | |
191 | * signal ext = 6 usec | |
192 | */ | |
c2d1560a JB |
193 | dur = 16; /* SIFS + signal ext */ |
194 | dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */ | |
195 | dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */ | |
196 | dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10, | |
197 | 4 * rate); /* T_SYM x N_SYM */ | |
198 | } else { | |
199 | /* | |
200 | * 802.11b or 802.11g with 802.11b compatibility: | |
201 | * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime + | |
202 | * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0. | |
203 | * | |
204 | * 802.11 (DS): 15.3.3, 802.11b: 18.3.4 | |
205 | * aSIFSTime = 10 usec | |
206 | * aPreambleLength = 144 usec or 72 usec with short preamble | |
207 | * aPLCPHeaderLength = 48 usec or 24 usec with short preamble | |
208 | */ | |
209 | dur = 10; /* aSIFSTime = 10 usec */ | |
210 | dur += short_preamble ? (72 + 24) : (144 + 48); | |
211 | ||
212 | dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate); | |
213 | } | |
214 | ||
215 | return dur; | |
216 | } | |
217 | ||
218 | /* Exported duration function for driver use */ | |
32bfd35d JB |
219 | __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, |
220 | struct ieee80211_vif *vif, | |
8318d78a JB |
221 | size_t frame_len, |
222 | struct ieee80211_rate *rate) | |
c2d1560a JB |
223 | { |
224 | struct ieee80211_local *local = hw_to_local(hw); | |
32bfd35d | 225 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
c2d1560a JB |
226 | u16 dur; |
227 | int erp; | |
228 | ||
8318d78a JB |
229 | erp = 0; |
230 | if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
231 | erp = rate->flags & IEEE80211_RATE_ERP_G; | |
232 | ||
233 | dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, | |
471b3efd | 234 | sdata->bss_conf.use_short_preamble); |
c2d1560a JB |
235 | |
236 | return cpu_to_le16(dur); | |
237 | } | |
238 | EXPORT_SYMBOL(ieee80211_generic_frame_duration); | |
239 | ||
32bfd35d JB |
240 | __le16 ieee80211_rts_duration(struct ieee80211_hw *hw, |
241 | struct ieee80211_vif *vif, size_t frame_len, | |
c2d1560a JB |
242 | const struct ieee80211_tx_control *frame_txctl) |
243 | { | |
244 | struct ieee80211_local *local = hw_to_local(hw); | |
245 | struct ieee80211_rate *rate; | |
32bfd35d | 246 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
471b3efd | 247 | bool short_preamble; |
c2d1560a JB |
248 | int erp; |
249 | u16 dur; | |
250 | ||
471b3efd | 251 | short_preamble = sdata->bss_conf.use_short_preamble; |
7e9ed188 | 252 | |
8318d78a JB |
253 | rate = frame_txctl->rts_cts_rate; |
254 | ||
255 | erp = 0; | |
256 | if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
257 | erp = rate->flags & IEEE80211_RATE_ERP_G; | |
c2d1560a JB |
258 | |
259 | /* CTS duration */ | |
8318d78a | 260 | dur = ieee80211_frame_duration(local, 10, rate->bitrate, |
c2d1560a JB |
261 | erp, short_preamble); |
262 | /* Data frame duration */ | |
8318d78a | 263 | dur += ieee80211_frame_duration(local, frame_len, rate->bitrate, |
c2d1560a JB |
264 | erp, short_preamble); |
265 | /* ACK duration */ | |
8318d78a | 266 | dur += ieee80211_frame_duration(local, 10, rate->bitrate, |
c2d1560a JB |
267 | erp, short_preamble); |
268 | ||
269 | return cpu_to_le16(dur); | |
270 | } | |
271 | EXPORT_SYMBOL(ieee80211_rts_duration); | |
272 | ||
32bfd35d JB |
273 | __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, |
274 | struct ieee80211_vif *vif, | |
c2d1560a JB |
275 | size_t frame_len, |
276 | const struct ieee80211_tx_control *frame_txctl) | |
277 | { | |
278 | struct ieee80211_local *local = hw_to_local(hw); | |
279 | struct ieee80211_rate *rate; | |
32bfd35d | 280 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
471b3efd | 281 | bool short_preamble; |
c2d1560a JB |
282 | int erp; |
283 | u16 dur; | |
284 | ||
471b3efd | 285 | short_preamble = sdata->bss_conf.use_short_preamble; |
7e9ed188 | 286 | |
8318d78a JB |
287 | rate = frame_txctl->rts_cts_rate; |
288 | erp = 0; | |
289 | if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
290 | erp = rate->flags & IEEE80211_RATE_ERP_G; | |
c2d1560a JB |
291 | |
292 | /* Data frame duration */ | |
8318d78a | 293 | dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, |
c2d1560a JB |
294 | erp, short_preamble); |
295 | if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) { | |
296 | /* ACK duration */ | |
8318d78a | 297 | dur += ieee80211_frame_duration(local, 10, rate->bitrate, |
c2d1560a JB |
298 | erp, short_preamble); |
299 | } | |
300 | ||
301 | return cpu_to_le16(dur); | |
302 | } | |
303 | EXPORT_SYMBOL(ieee80211_ctstoself_duration); | |
304 | ||
c2d1560a JB |
305 | void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue) |
306 | { | |
307 | struct ieee80211_local *local = hw_to_local(hw); | |
308 | ||
309 | if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF, | |
310 | &local->state[queue])) { | |
311 | if (test_bit(IEEE80211_LINK_STATE_PENDING, | |
312 | &local->state[queue])) | |
313 | tasklet_schedule(&local->tx_pending_tasklet); | |
314 | else | |
315 | if (!ieee80211_qdisc_installed(local->mdev)) { | |
316 | if (queue == 0) | |
317 | netif_wake_queue(local->mdev); | |
318 | } else | |
319 | __netif_schedule(local->mdev); | |
320 | } | |
321 | } | |
322 | EXPORT_SYMBOL(ieee80211_wake_queue); | |
323 | ||
324 | void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue) | |
325 | { | |
326 | struct ieee80211_local *local = hw_to_local(hw); | |
327 | ||
328 | if (!ieee80211_qdisc_installed(local->mdev) && queue == 0) | |
329 | netif_stop_queue(local->mdev); | |
330 | set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]); | |
331 | } | |
332 | EXPORT_SYMBOL(ieee80211_stop_queue); | |
333 | ||
334 | void ieee80211_start_queues(struct ieee80211_hw *hw) | |
335 | { | |
336 | struct ieee80211_local *local = hw_to_local(hw); | |
337 | int i; | |
338 | ||
339 | for (i = 0; i < local->hw.queues; i++) | |
340 | clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]); | |
341 | if (!ieee80211_qdisc_installed(local->mdev)) | |
342 | netif_start_queue(local->mdev); | |
343 | } | |
344 | EXPORT_SYMBOL(ieee80211_start_queues); | |
345 | ||
346 | void ieee80211_stop_queues(struct ieee80211_hw *hw) | |
347 | { | |
348 | int i; | |
349 | ||
350 | for (i = 0; i < hw->queues; i++) | |
351 | ieee80211_stop_queue(hw, i); | |
352 | } | |
353 | EXPORT_SYMBOL(ieee80211_stop_queues); | |
354 | ||
355 | void ieee80211_wake_queues(struct ieee80211_hw *hw) | |
356 | { | |
357 | int i; | |
358 | ||
359 | for (i = 0; i < hw->queues; i++) | |
360 | ieee80211_wake_queue(hw, i); | |
361 | } | |
362 | EXPORT_SYMBOL(ieee80211_wake_queues); | |
dabeb344 | 363 | |
32bfd35d JB |
364 | void ieee80211_iterate_active_interfaces( |
365 | struct ieee80211_hw *hw, | |
366 | void (*iterator)(void *data, u8 *mac, | |
367 | struct ieee80211_vif *vif), | |
368 | void *data) | |
dabeb344 JB |
369 | { |
370 | struct ieee80211_local *local = hw_to_local(hw); | |
371 | struct ieee80211_sub_if_data *sdata; | |
372 | ||
e38bad47 | 373 | rcu_read_lock(); |
dabeb344 | 374 | |
e38bad47 | 375 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
51fb61e7 | 376 | switch (sdata->vif.type) { |
dabeb344 JB |
377 | case IEEE80211_IF_TYPE_INVALID: |
378 | case IEEE80211_IF_TYPE_MNTR: | |
379 | case IEEE80211_IF_TYPE_VLAN: | |
380 | continue; | |
381 | case IEEE80211_IF_TYPE_AP: | |
382 | case IEEE80211_IF_TYPE_STA: | |
383 | case IEEE80211_IF_TYPE_IBSS: | |
384 | case IEEE80211_IF_TYPE_WDS: | |
385 | break; | |
386 | } | |
387 | if (sdata->dev == local->mdev) | |
388 | continue; | |
389 | if (netif_running(sdata->dev)) | |
390 | iterator(data, sdata->dev->dev_addr, | |
32bfd35d | 391 | &sdata->vif); |
dabeb344 | 392 | } |
e38bad47 JB |
393 | |
394 | rcu_read_unlock(); | |
dabeb344 JB |
395 | } |
396 | EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces); |