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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 | * | |
12 | * Transmit and frame generation functions. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/etherdevice.h> | |
19 | #include <linux/bitmap.h> | |
20 | #include <linux/rcupdate.h> | |
21 | #include <linux/export.h> | |
22 | #include <linux/time.h> | |
23 | #include <net/net_namespace.h> | |
24 | #include <net/ieee80211_radiotap.h> | |
25 | #include <net/cfg80211.h> | |
26 | #include <net/mac80211.h> | |
27 | #include <asm/unaligned.h> | |
28 | ||
29 | #include "ieee80211_i.h" | |
30 | #include "driver-ops.h" | |
31 | #include "led.h" | |
32 | #include "mesh.h" | |
33 | #include "wep.h" | |
34 | #include "wpa.h" | |
35 | #include "wme.h" | |
36 | #include "rate.h" | |
37 | ||
38 | /* misc utils */ | |
39 | ||
40 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, | |
41 | struct sk_buff *skb, int group_addr, | |
42 | int next_frag_len) | |
43 | { | |
44 | int rate, mrate, erp, dur, i, shift = 0; | |
45 | struct ieee80211_rate *txrate; | |
46 | struct ieee80211_local *local = tx->local; | |
47 | struct ieee80211_supported_band *sband; | |
48 | struct ieee80211_hdr *hdr; | |
49 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
50 | struct ieee80211_chanctx_conf *chanctx_conf; | |
51 | u32 rate_flags = 0; | |
52 | ||
53 | rcu_read_lock(); | |
54 | chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); | |
55 | if (chanctx_conf) { | |
56 | shift = ieee80211_chandef_get_shift(&chanctx_conf->def); | |
57 | rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); | |
58 | } | |
59 | rcu_read_unlock(); | |
60 | ||
61 | /* assume HW handles this */ | |
62 | if (tx->rate.flags & IEEE80211_TX_RC_MCS) | |
63 | return 0; | |
64 | ||
65 | /* uh huh? */ | |
66 | if (WARN_ON_ONCE(tx->rate.idx < 0)) | |
67 | return 0; | |
68 | ||
69 | sband = local->hw.wiphy->bands[info->band]; | |
70 | txrate = &sband->bitrates[tx->rate.idx]; | |
71 | ||
72 | erp = txrate->flags & IEEE80211_RATE_ERP_G; | |
73 | ||
74 | /* | |
75 | * data and mgmt (except PS Poll): | |
76 | * - during CFP: 32768 | |
77 | * - during contention period: | |
78 | * if addr1 is group address: 0 | |
79 | * if more fragments = 0 and addr1 is individual address: time to | |
80 | * transmit one ACK plus SIFS | |
81 | * if more fragments = 1 and addr1 is individual address: time to | |
82 | * transmit next fragment plus 2 x ACK plus 3 x SIFS | |
83 | * | |
84 | * IEEE 802.11, 9.6: | |
85 | * - control response frame (CTS or ACK) shall be transmitted using the | |
86 | * same rate as the immediately previous frame in the frame exchange | |
87 | * sequence, if this rate belongs to the PHY mandatory rates, or else | |
88 | * at the highest possible rate belonging to the PHY rates in the | |
89 | * BSSBasicRateSet | |
90 | */ | |
91 | hdr = (struct ieee80211_hdr *)skb->data; | |
92 | if (ieee80211_is_ctl(hdr->frame_control)) { | |
93 | /* TODO: These control frames are not currently sent by | |
94 | * mac80211, but should they be implemented, this function | |
95 | * needs to be updated to support duration field calculation. | |
96 | * | |
97 | * RTS: time needed to transmit pending data/mgmt frame plus | |
98 | * one CTS frame plus one ACK frame plus 3 x SIFS | |
99 | * CTS: duration of immediately previous RTS minus time | |
100 | * required to transmit CTS and its SIFS | |
101 | * ACK: 0 if immediately previous directed data/mgmt had | |
102 | * more=0, with more=1 duration in ACK frame is duration | |
103 | * from previous frame minus time needed to transmit ACK | |
104 | * and its SIFS | |
105 | * PS Poll: BIT(15) | BIT(14) | aid | |
106 | */ | |
107 | return 0; | |
108 | } | |
109 | ||
110 | /* data/mgmt */ | |
111 | if (0 /* FIX: data/mgmt during CFP */) | |
112 | return cpu_to_le16(32768); | |
113 | ||
114 | if (group_addr) /* Group address as the destination - no ACK */ | |
115 | return 0; | |
116 | ||
117 | /* Individual destination address: | |
118 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) | |
119 | * CTS and ACK frames shall be transmitted using the highest rate in | |
120 | * basic rate set that is less than or equal to the rate of the | |
121 | * immediately previous frame and that is using the same modulation | |
122 | * (CCK or OFDM). If no basic rate set matches with these requirements, | |
123 | * the highest mandatory rate of the PHY that is less than or equal to | |
124 | * the rate of the previous frame is used. | |
125 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps | |
126 | */ | |
127 | rate = -1; | |
128 | /* use lowest available if everything fails */ | |
129 | mrate = sband->bitrates[0].bitrate; | |
130 | for (i = 0; i < sband->n_bitrates; i++) { | |
131 | struct ieee80211_rate *r = &sband->bitrates[i]; | |
132 | ||
133 | if (r->bitrate > txrate->bitrate) | |
134 | break; | |
135 | ||
136 | if ((rate_flags & r->flags) != rate_flags) | |
137 | continue; | |
138 | ||
139 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) | |
140 | rate = DIV_ROUND_UP(r->bitrate, 1 << shift); | |
141 | ||
142 | switch (sband->band) { | |
143 | case IEEE80211_BAND_2GHZ: { | |
144 | u32 flag; | |
145 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) | |
146 | flag = IEEE80211_RATE_MANDATORY_G; | |
147 | else | |
148 | flag = IEEE80211_RATE_MANDATORY_B; | |
149 | if (r->flags & flag) | |
150 | mrate = r->bitrate; | |
151 | break; | |
152 | } | |
153 | case IEEE80211_BAND_5GHZ: | |
154 | if (r->flags & IEEE80211_RATE_MANDATORY_A) | |
155 | mrate = r->bitrate; | |
156 | break; | |
157 | case IEEE80211_BAND_60GHZ: | |
158 | /* TODO, for now fall through */ | |
159 | case IEEE80211_NUM_BANDS: | |
160 | WARN_ON(1); | |
161 | break; | |
162 | } | |
163 | } | |
164 | if (rate == -1) { | |
165 | /* No matching basic rate found; use highest suitable mandatory | |
166 | * PHY rate */ | |
167 | rate = DIV_ROUND_UP(mrate, 1 << shift); | |
168 | } | |
169 | ||
170 | /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ | |
171 | if (ieee80211_is_data_qos(hdr->frame_control) && | |
172 | *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) | |
173 | dur = 0; | |
174 | else | |
175 | /* Time needed to transmit ACK | |
176 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up | |
177 | * to closest integer */ | |
178 | dur = ieee80211_frame_duration(sband->band, 10, rate, erp, | |
179 | tx->sdata->vif.bss_conf.use_short_preamble, | |
180 | shift); | |
181 | ||
182 | if (next_frag_len) { | |
183 | /* Frame is fragmented: duration increases with time needed to | |
184 | * transmit next fragment plus ACK and 2 x SIFS. */ | |
185 | dur *= 2; /* ACK + SIFS */ | |
186 | /* next fragment */ | |
187 | dur += ieee80211_frame_duration(sband->band, next_frag_len, | |
188 | txrate->bitrate, erp, | |
189 | tx->sdata->vif.bss_conf.use_short_preamble, | |
190 | shift); | |
191 | } | |
192 | ||
193 | return cpu_to_le16(dur); | |
194 | } | |
195 | ||
196 | /* tx handlers */ | |
197 | static ieee80211_tx_result debug_noinline | |
198 | ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) | |
199 | { | |
200 | struct ieee80211_local *local = tx->local; | |
201 | struct ieee80211_if_managed *ifmgd; | |
202 | ||
203 | /* driver doesn't support power save */ | |
204 | if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) | |
205 | return TX_CONTINUE; | |
206 | ||
207 | /* hardware does dynamic power save */ | |
208 | if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) | |
209 | return TX_CONTINUE; | |
210 | ||
211 | /* dynamic power save disabled */ | |
212 | if (local->hw.conf.dynamic_ps_timeout <= 0) | |
213 | return TX_CONTINUE; | |
214 | ||
215 | /* we are scanning, don't enable power save */ | |
216 | if (local->scanning) | |
217 | return TX_CONTINUE; | |
218 | ||
219 | if (!local->ps_sdata) | |
220 | return TX_CONTINUE; | |
221 | ||
222 | /* No point if we're going to suspend */ | |
223 | if (local->quiescing) | |
224 | return TX_CONTINUE; | |
225 | ||
226 | /* dynamic ps is supported only in managed mode */ | |
227 | if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) | |
228 | return TX_CONTINUE; | |
229 | ||
230 | ifmgd = &tx->sdata->u.mgd; | |
231 | ||
232 | /* | |
233 | * Don't wakeup from power save if u-apsd is enabled, voip ac has | |
234 | * u-apsd enabled and the frame is in voip class. This effectively | |
235 | * means that even if all access categories have u-apsd enabled, in | |
236 | * practise u-apsd is only used with the voip ac. This is a | |
237 | * workaround for the case when received voip class packets do not | |
238 | * have correct qos tag for some reason, due the network or the | |
239 | * peer application. | |
240 | * | |
241 | * Note: ifmgd->uapsd_queues access is racy here. If the value is | |
242 | * changed via debugfs, user needs to reassociate manually to have | |
243 | * everything in sync. | |
244 | */ | |
245 | if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && | |
246 | (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && | |
247 | skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) | |
248 | return TX_CONTINUE; | |
249 | ||
250 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
251 | ieee80211_stop_queues_by_reason(&local->hw, | |
252 | IEEE80211_MAX_QUEUE_MAP, | |
253 | IEEE80211_QUEUE_STOP_REASON_PS); | |
254 | ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; | |
255 | ieee80211_queue_work(&local->hw, | |
256 | &local->dynamic_ps_disable_work); | |
257 | } | |
258 | ||
259 | /* Don't restart the timer if we're not disassociated */ | |
260 | if (!ifmgd->associated) | |
261 | return TX_CONTINUE; | |
262 | ||
263 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
264 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
265 | ||
266 | return TX_CONTINUE; | |
267 | } | |
268 | ||
269 | static ieee80211_tx_result debug_noinline | |
270 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) | |
271 | { | |
272 | ||
273 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
274 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
275 | bool assoc = false; | |
276 | ||
277 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) | |
278 | return TX_CONTINUE; | |
279 | ||
280 | if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && | |
281 | test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && | |
282 | !ieee80211_is_probe_req(hdr->frame_control) && | |
283 | !ieee80211_is_nullfunc(hdr->frame_control)) | |
284 | /* | |
285 | * When software scanning only nullfunc frames (to notify | |
286 | * the sleep state to the AP) and probe requests (for the | |
287 | * active scan) are allowed, all other frames should not be | |
288 | * sent and we should not get here, but if we do | |
289 | * nonetheless, drop them to avoid sending them | |
290 | * off-channel. See the link below and | |
291 | * ieee80211_start_scan() for more. | |
292 | * | |
293 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 | |
294 | */ | |
295 | return TX_DROP; | |
296 | ||
297 | if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) | |
298 | return TX_CONTINUE; | |
299 | ||
300 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
301 | return TX_CONTINUE; | |
302 | ||
303 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) | |
304 | return TX_CONTINUE; | |
305 | ||
306 | if (tx->sta) | |
307 | assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); | |
308 | ||
309 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { | |
310 | if (unlikely(!assoc && | |
311 | ieee80211_is_data(hdr->frame_control))) { | |
312 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
313 | sdata_info(tx->sdata, | |
314 | "dropped data frame to not associated station %pM\n", | |
315 | hdr->addr1); | |
316 | #endif | |
317 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); | |
318 | return TX_DROP; | |
319 | } | |
320 | } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && | |
321 | ieee80211_is_data(hdr->frame_control) && | |
322 | !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { | |
323 | /* | |
324 | * No associated STAs - no need to send multicast | |
325 | * frames. | |
326 | */ | |
327 | return TX_DROP; | |
328 | } | |
329 | ||
330 | return TX_CONTINUE; | |
331 | } | |
332 | ||
333 | /* This function is called whenever the AP is about to exceed the maximum limit | |
334 | * of buffered frames for power saving STAs. This situation should not really | |
335 | * happen often during normal operation, so dropping the oldest buffered packet | |
336 | * from each queue should be OK to make some room for new frames. */ | |
337 | static void purge_old_ps_buffers(struct ieee80211_local *local) | |
338 | { | |
339 | int total = 0, purged = 0; | |
340 | struct sk_buff *skb; | |
341 | struct ieee80211_sub_if_data *sdata; | |
342 | struct sta_info *sta; | |
343 | ||
344 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
345 | struct ps_data *ps; | |
346 | ||
347 | if (sdata->vif.type == NL80211_IFTYPE_AP) | |
348 | ps = &sdata->u.ap.ps; | |
349 | else if (ieee80211_vif_is_mesh(&sdata->vif)) | |
350 | ps = &sdata->u.mesh.ps; | |
351 | else | |
352 | continue; | |
353 | ||
354 | skb = skb_dequeue(&ps->bc_buf); | |
355 | if (skb) { | |
356 | purged++; | |
357 | dev_kfree_skb(skb); | |
358 | } | |
359 | total += skb_queue_len(&ps->bc_buf); | |
360 | } | |
361 | ||
362 | /* | |
363 | * Drop one frame from each station from the lowest-priority | |
364 | * AC that has frames at all. | |
365 | */ | |
366 | list_for_each_entry_rcu(sta, &local->sta_list, list) { | |
367 | int ac; | |
368 | ||
369 | for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { | |
370 | skb = skb_dequeue(&sta->ps_tx_buf[ac]); | |
371 | total += skb_queue_len(&sta->ps_tx_buf[ac]); | |
372 | if (skb) { | |
373 | purged++; | |
374 | ieee80211_free_txskb(&local->hw, skb); | |
375 | break; | |
376 | } | |
377 | } | |
378 | } | |
379 | ||
380 | local->total_ps_buffered = total; | |
381 | ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); | |
382 | } | |
383 | ||
384 | static ieee80211_tx_result | |
385 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) | |
386 | { | |
387 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
388 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
389 | struct ps_data *ps; | |
390 | ||
391 | /* | |
392 | * broadcast/multicast frame | |
393 | * | |
394 | * If any of the associated/peer stations is in power save mode, | |
395 | * the frame is buffered to be sent after DTIM beacon frame. | |
396 | * This is done either by the hardware or us. | |
397 | */ | |
398 | ||
399 | /* powersaving STAs currently only in AP/VLAN/mesh mode */ | |
400 | if (tx->sdata->vif.type == NL80211_IFTYPE_AP || | |
401 | tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { | |
402 | if (!tx->sdata->bss) | |
403 | return TX_CONTINUE; | |
404 | ||
405 | ps = &tx->sdata->bss->ps; | |
406 | } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { | |
407 | ps = &tx->sdata->u.mesh.ps; | |
408 | } else { | |
409 | return TX_CONTINUE; | |
410 | } | |
411 | ||
412 | ||
413 | /* no buffering for ordered frames */ | |
414 | if (ieee80211_has_order(hdr->frame_control)) | |
415 | return TX_CONTINUE; | |
416 | ||
417 | if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) | |
418 | info->hw_queue = tx->sdata->vif.cab_queue; | |
419 | ||
420 | /* no stations in PS mode */ | |
421 | if (!atomic_read(&ps->num_sta_ps)) | |
422 | return TX_CONTINUE; | |
423 | ||
424 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; | |
425 | ||
426 | /* device releases frame after DTIM beacon */ | |
427 | if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) | |
428 | return TX_CONTINUE; | |
429 | ||
430 | /* buffered in mac80211 */ | |
431 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) | |
432 | purge_old_ps_buffers(tx->local); | |
433 | ||
434 | if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { | |
435 | ps_dbg(tx->sdata, | |
436 | "BC TX buffer full - dropping the oldest frame\n"); | |
437 | dev_kfree_skb(skb_dequeue(&ps->bc_buf)); | |
438 | } else | |
439 | tx->local->total_ps_buffered++; | |
440 | ||
441 | skb_queue_tail(&ps->bc_buf, tx->skb); | |
442 | ||
443 | return TX_QUEUED; | |
444 | } | |
445 | ||
446 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, | |
447 | struct sk_buff *skb) | |
448 | { | |
449 | if (!ieee80211_is_mgmt(fc)) | |
450 | return 0; | |
451 | ||
452 | if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) | |
453 | return 0; | |
454 | ||
455 | if (!ieee80211_is_robust_mgmt_frame(skb)) | |
456 | return 0; | |
457 | ||
458 | return 1; | |
459 | } | |
460 | ||
461 | static ieee80211_tx_result | |
462 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) | |
463 | { | |
464 | struct sta_info *sta = tx->sta; | |
465 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
466 | struct ieee80211_local *local = tx->local; | |
467 | ||
468 | if (unlikely(!sta)) | |
469 | return TX_CONTINUE; | |
470 | ||
471 | if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || | |
472 | test_sta_flag(sta, WLAN_STA_PS_DRIVER) || | |
473 | test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && | |
474 | !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { | |
475 | int ac = skb_get_queue_mapping(tx->skb); | |
476 | ||
477 | ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", | |
478 | sta->sta.addr, sta->sta.aid, ac); | |
479 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) | |
480 | purge_old_ps_buffers(tx->local); | |
481 | ||
482 | /* sync with ieee80211_sta_ps_deliver_wakeup */ | |
483 | spin_lock(&sta->ps_lock); | |
484 | /* | |
485 | * STA woke up the meantime and all the frames on ps_tx_buf have | |
486 | * been queued to pending queue. No reordering can happen, go | |
487 | * ahead and Tx the packet. | |
488 | */ | |
489 | if (!test_sta_flag(sta, WLAN_STA_PS_STA) && | |
490 | !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && | |
491 | !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { | |
492 | spin_unlock(&sta->ps_lock); | |
493 | return TX_CONTINUE; | |
494 | } | |
495 | ||
496 | if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { | |
497 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); | |
498 | ps_dbg(tx->sdata, | |
499 | "STA %pM TX buffer for AC %d full - dropping oldest frame\n", | |
500 | sta->sta.addr, ac); | |
501 | ieee80211_free_txskb(&local->hw, old); | |
502 | } else | |
503 | tx->local->total_ps_buffered++; | |
504 | ||
505 | info->control.jiffies = jiffies; | |
506 | info->control.vif = &tx->sdata->vif; | |
507 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
508 | info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; | |
509 | skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); | |
510 | spin_unlock(&sta->ps_lock); | |
511 | ||
512 | if (!timer_pending(&local->sta_cleanup)) | |
513 | mod_timer(&local->sta_cleanup, | |
514 | round_jiffies(jiffies + | |
515 | STA_INFO_CLEANUP_INTERVAL)); | |
516 | ||
517 | /* | |
518 | * We queued up some frames, so the TIM bit might | |
519 | * need to be set, recalculate it. | |
520 | */ | |
521 | sta_info_recalc_tim(sta); | |
522 | ||
523 | return TX_QUEUED; | |
524 | } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { | |
525 | ps_dbg(tx->sdata, | |
526 | "STA %pM in PS mode, but polling/in SP -> send frame\n", | |
527 | sta->sta.addr); | |
528 | } | |
529 | ||
530 | return TX_CONTINUE; | |
531 | } | |
532 | ||
533 | static ieee80211_tx_result debug_noinline | |
534 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) | |
535 | { | |
536 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
537 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
538 | ||
539 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) | |
540 | return TX_CONTINUE; | |
541 | ||
542 | if (ieee80211_is_mgmt(hdr->frame_control) && | |
543 | !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { | |
544 | if (tx->flags & IEEE80211_TX_UNICAST) | |
545 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; | |
546 | return TX_CONTINUE; | |
547 | } | |
548 | ||
549 | if (tx->flags & IEEE80211_TX_UNICAST) | |
550 | return ieee80211_tx_h_unicast_ps_buf(tx); | |
551 | else | |
552 | return ieee80211_tx_h_multicast_ps_buf(tx); | |
553 | } | |
554 | ||
555 | static ieee80211_tx_result debug_noinline | |
556 | ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) | |
557 | { | |
558 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
559 | ||
560 | if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { | |
561 | if (tx->sdata->control_port_no_encrypt) | |
562 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; | |
563 | info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; | |
564 | } | |
565 | ||
566 | return TX_CONTINUE; | |
567 | } | |
568 | ||
569 | static ieee80211_tx_result debug_noinline | |
570 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) | |
571 | { | |
572 | struct ieee80211_key *key; | |
573 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
574 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
575 | ||
576 | if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) | |
577 | tx->key = NULL; | |
578 | else if (tx->sta && | |
579 | (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) | |
580 | tx->key = key; | |
581 | else if (ieee80211_is_mgmt(hdr->frame_control) && | |
582 | is_multicast_ether_addr(hdr->addr1) && | |
583 | ieee80211_is_robust_mgmt_frame(tx->skb) && | |
584 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) | |
585 | tx->key = key; | |
586 | else if (is_multicast_ether_addr(hdr->addr1) && | |
587 | (key = rcu_dereference(tx->sdata->default_multicast_key))) | |
588 | tx->key = key; | |
589 | else if (!is_multicast_ether_addr(hdr->addr1) && | |
590 | (key = rcu_dereference(tx->sdata->default_unicast_key))) | |
591 | tx->key = key; | |
592 | else if (info->flags & IEEE80211_TX_CTL_INJECTED) | |
593 | tx->key = NULL; | |
594 | else if (!tx->sdata->drop_unencrypted) | |
595 | tx->key = NULL; | |
596 | else if (tx->skb->protocol == tx->sdata->control_port_protocol) | |
597 | tx->key = NULL; | |
598 | else if (ieee80211_is_robust_mgmt_frame(tx->skb) && | |
599 | !(ieee80211_is_action(hdr->frame_control) && | |
600 | tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) | |
601 | tx->key = NULL; | |
602 | else if (ieee80211_is_mgmt(hdr->frame_control) && | |
603 | !ieee80211_is_robust_mgmt_frame(tx->skb)) | |
604 | tx->key = NULL; | |
605 | else { | |
606 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); | |
607 | return TX_DROP; | |
608 | } | |
609 | ||
610 | if (tx->key) { | |
611 | bool skip_hw = false; | |
612 | ||
613 | tx->key->tx_rx_count++; | |
614 | /* TODO: add threshold stuff again */ | |
615 | ||
616 | switch (tx->key->conf.cipher) { | |
617 | case WLAN_CIPHER_SUITE_WEP40: | |
618 | case WLAN_CIPHER_SUITE_WEP104: | |
619 | case WLAN_CIPHER_SUITE_TKIP: | |
620 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
621 | tx->key = NULL; | |
622 | break; | |
623 | case WLAN_CIPHER_SUITE_CCMP: | |
624 | if (!ieee80211_is_data_present(hdr->frame_control) && | |
625 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, | |
626 | tx->skb)) | |
627 | tx->key = NULL; | |
628 | else | |
629 | skip_hw = (tx->key->conf.flags & | |
630 | IEEE80211_KEY_FLAG_SW_MGMT_TX) && | |
631 | ieee80211_is_mgmt(hdr->frame_control); | |
632 | break; | |
633 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
634 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
635 | tx->key = NULL; | |
636 | break; | |
637 | } | |
638 | ||
639 | if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && | |
640 | !ieee80211_is_deauth(hdr->frame_control))) | |
641 | return TX_DROP; | |
642 | ||
643 | if (!skip_hw && tx->key && | |
644 | tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) | |
645 | info->control.hw_key = &tx->key->conf; | |
646 | } | |
647 | ||
648 | return TX_CONTINUE; | |
649 | } | |
650 | ||
651 | static ieee80211_tx_result debug_noinline | |
652 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) | |
653 | { | |
654 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
655 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; | |
656 | struct ieee80211_supported_band *sband; | |
657 | u32 len; | |
658 | struct ieee80211_tx_rate_control txrc; | |
659 | struct ieee80211_sta_rates *ratetbl = NULL; | |
660 | bool assoc = false; | |
661 | ||
662 | memset(&txrc, 0, sizeof(txrc)); | |
663 | ||
664 | sband = tx->local->hw.wiphy->bands[info->band]; | |
665 | ||
666 | len = min_t(u32, tx->skb->len + FCS_LEN, | |
667 | tx->local->hw.wiphy->frag_threshold); | |
668 | ||
669 | /* set up the tx rate control struct we give the RC algo */ | |
670 | txrc.hw = &tx->local->hw; | |
671 | txrc.sband = sband; | |
672 | txrc.bss_conf = &tx->sdata->vif.bss_conf; | |
673 | txrc.skb = tx->skb; | |
674 | txrc.reported_rate.idx = -1; | |
675 | txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; | |
676 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) | |
677 | txrc.max_rate_idx = -1; | |
678 | else | |
679 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
680 | ||
681 | if (tx->sdata->rc_has_mcs_mask[info->band]) | |
682 | txrc.rate_idx_mcs_mask = | |
683 | tx->sdata->rc_rateidx_mcs_mask[info->band]; | |
684 | ||
685 | txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || | |
686 | tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || | |
687 | tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); | |
688 | ||
689 | /* set up RTS protection if desired */ | |
690 | if (len > tx->local->hw.wiphy->rts_threshold) { | |
691 | txrc.rts = true; | |
692 | } | |
693 | ||
694 | info->control.use_rts = txrc.rts; | |
695 | info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; | |
696 | ||
697 | /* | |
698 | * Use short preamble if the BSS can handle it, but not for | |
699 | * management frames unless we know the receiver can handle | |
700 | * that -- the management frame might be to a station that | |
701 | * just wants a probe response. | |
702 | */ | |
703 | if (tx->sdata->vif.bss_conf.use_short_preamble && | |
704 | (ieee80211_is_data(hdr->frame_control) || | |
705 | (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) | |
706 | txrc.short_preamble = true; | |
707 | ||
708 | info->control.short_preamble = txrc.short_preamble; | |
709 | ||
710 | if (tx->sta) | |
711 | assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); | |
712 | ||
713 | /* | |
714 | * Lets not bother rate control if we're associated and cannot | |
715 | * talk to the sta. This should not happen. | |
716 | */ | |
717 | if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && | |
718 | !rate_usable_index_exists(sband, &tx->sta->sta), | |
719 | "%s: Dropped data frame as no usable bitrate found while " | |
720 | "scanning and associated. Target station: " | |
721 | "%pM on %d GHz band\n", | |
722 | tx->sdata->name, hdr->addr1, | |
723 | info->band ? 5 : 2)) | |
724 | return TX_DROP; | |
725 | ||
726 | /* | |
727 | * If we're associated with the sta at this point we know we can at | |
728 | * least send the frame at the lowest bit rate. | |
729 | */ | |
730 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); | |
731 | ||
732 | if (tx->sta && !info->control.skip_table) | |
733 | ratetbl = rcu_dereference(tx->sta->sta.rates); | |
734 | ||
735 | if (unlikely(info->control.rates[0].idx < 0)) { | |
736 | if (ratetbl) { | |
737 | struct ieee80211_tx_rate rate = { | |
738 | .idx = ratetbl->rate[0].idx, | |
739 | .flags = ratetbl->rate[0].flags, | |
740 | .count = ratetbl->rate[0].count | |
741 | }; | |
742 | ||
743 | if (ratetbl->rate[0].idx < 0) | |
744 | return TX_DROP; | |
745 | ||
746 | tx->rate = rate; | |
747 | } else { | |
748 | return TX_DROP; | |
749 | } | |
750 | } else { | |
751 | tx->rate = info->control.rates[0]; | |
752 | } | |
753 | ||
754 | if (txrc.reported_rate.idx < 0) { | |
755 | txrc.reported_rate = tx->rate; | |
756 | if (tx->sta && ieee80211_is_data(hdr->frame_control)) | |
757 | tx->sta->last_tx_rate = txrc.reported_rate; | |
758 | } else if (tx->sta) | |
759 | tx->sta->last_tx_rate = txrc.reported_rate; | |
760 | ||
761 | if (ratetbl) | |
762 | return TX_CONTINUE; | |
763 | ||
764 | if (unlikely(!info->control.rates[0].count)) | |
765 | info->control.rates[0].count = 1; | |
766 | ||
767 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && | |
768 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) | |
769 | info->control.rates[0].count = 1; | |
770 | ||
771 | return TX_CONTINUE; | |
772 | } | |
773 | ||
774 | static ieee80211_tx_result debug_noinline | |
775 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) | |
776 | { | |
777 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
778 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; | |
779 | u16 *seq; | |
780 | u8 *qc; | |
781 | int tid; | |
782 | ||
783 | /* | |
784 | * Packet injection may want to control the sequence | |
785 | * number, if we have no matching interface then we | |
786 | * neither assign one ourselves nor ask the driver to. | |
787 | */ | |
788 | if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) | |
789 | return TX_CONTINUE; | |
790 | ||
791 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) | |
792 | return TX_CONTINUE; | |
793 | ||
794 | if (ieee80211_hdrlen(hdr->frame_control) < 24) | |
795 | return TX_CONTINUE; | |
796 | ||
797 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
798 | return TX_CONTINUE; | |
799 | ||
800 | /* | |
801 | * Anything but QoS data that has a sequence number field | |
802 | * (is long enough) gets a sequence number from the global | |
803 | * counter. QoS data frames with a multicast destination | |
804 | * also use the global counter (802.11-2012 9.3.2.10). | |
805 | */ | |
806 | if (!ieee80211_is_data_qos(hdr->frame_control) || | |
807 | is_multicast_ether_addr(hdr->addr1)) { | |
808 | /* driver should assign sequence number */ | |
809 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; | |
810 | /* for pure STA mode without beacons, we can do it */ | |
811 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); | |
812 | tx->sdata->sequence_number += 0x10; | |
813 | return TX_CONTINUE; | |
814 | } | |
815 | ||
816 | /* | |
817 | * This should be true for injected/management frames only, for | |
818 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ | |
819 | * above since they are not QoS-data frames. | |
820 | */ | |
821 | if (!tx->sta) | |
822 | return TX_CONTINUE; | |
823 | ||
824 | /* include per-STA, per-TID sequence counter */ | |
825 | ||
826 | qc = ieee80211_get_qos_ctl(hdr); | |
827 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
828 | seq = &tx->sta->tid_seq[tid]; | |
829 | ||
830 | hdr->seq_ctrl = cpu_to_le16(*seq); | |
831 | ||
832 | /* Increase the sequence number. */ | |
833 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; | |
834 | ||
835 | return TX_CONTINUE; | |
836 | } | |
837 | ||
838 | static int ieee80211_fragment(struct ieee80211_tx_data *tx, | |
839 | struct sk_buff *skb, int hdrlen, | |
840 | int frag_threshold) | |
841 | { | |
842 | struct ieee80211_local *local = tx->local; | |
843 | struct ieee80211_tx_info *info; | |
844 | struct sk_buff *tmp; | |
845 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; | |
846 | int pos = hdrlen + per_fragm; | |
847 | int rem = skb->len - hdrlen - per_fragm; | |
848 | ||
849 | if (WARN_ON(rem < 0)) | |
850 | return -EINVAL; | |
851 | ||
852 | /* first fragment was already added to queue by caller */ | |
853 | ||
854 | while (rem) { | |
855 | int fraglen = per_fragm; | |
856 | ||
857 | if (fraglen > rem) | |
858 | fraglen = rem; | |
859 | rem -= fraglen; | |
860 | tmp = dev_alloc_skb(local->tx_headroom + | |
861 | frag_threshold + | |
862 | tx->sdata->encrypt_headroom + | |
863 | IEEE80211_ENCRYPT_TAILROOM); | |
864 | if (!tmp) | |
865 | return -ENOMEM; | |
866 | ||
867 | __skb_queue_tail(&tx->skbs, tmp); | |
868 | ||
869 | skb_reserve(tmp, | |
870 | local->tx_headroom + tx->sdata->encrypt_headroom); | |
871 | ||
872 | /* copy control information */ | |
873 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); | |
874 | ||
875 | info = IEEE80211_SKB_CB(tmp); | |
876 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | | |
877 | IEEE80211_TX_CTL_FIRST_FRAGMENT); | |
878 | ||
879 | if (rem) | |
880 | info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; | |
881 | ||
882 | skb_copy_queue_mapping(tmp, skb); | |
883 | tmp->priority = skb->priority; | |
884 | tmp->dev = skb->dev; | |
885 | ||
886 | /* copy header and data */ | |
887 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); | |
888 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); | |
889 | ||
890 | pos += fraglen; | |
891 | } | |
892 | ||
893 | /* adjust first fragment's length */ | |
894 | skb_trim(skb, hdrlen + per_fragm); | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static ieee80211_tx_result debug_noinline | |
899 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) | |
900 | { | |
901 | struct sk_buff *skb = tx->skb; | |
902 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
903 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
904 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; | |
905 | int hdrlen; | |
906 | int fragnum; | |
907 | ||
908 | /* no matter what happens, tx->skb moves to tx->skbs */ | |
909 | __skb_queue_tail(&tx->skbs, skb); | |
910 | tx->skb = NULL; | |
911 | ||
912 | if (info->flags & IEEE80211_TX_CTL_DONTFRAG) | |
913 | return TX_CONTINUE; | |
914 | ||
915 | if (tx->local->ops->set_frag_threshold) | |
916 | return TX_CONTINUE; | |
917 | ||
918 | /* | |
919 | * Warn when submitting a fragmented A-MPDU frame and drop it. | |
920 | * This scenario is handled in ieee80211_tx_prepare but extra | |
921 | * caution taken here as fragmented ampdu may cause Tx stop. | |
922 | */ | |
923 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) | |
924 | return TX_DROP; | |
925 | ||
926 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
927 | ||
928 | /* internal error, why isn't DONTFRAG set? */ | |
929 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) | |
930 | return TX_DROP; | |
931 | ||
932 | /* | |
933 | * Now fragment the frame. This will allocate all the fragments and | |
934 | * chain them (using skb as the first fragment) to skb->next. | |
935 | * During transmission, we will remove the successfully transmitted | |
936 | * fragments from this list. When the low-level driver rejects one | |
937 | * of the fragments then we will simply pretend to accept the skb | |
938 | * but store it away as pending. | |
939 | */ | |
940 | if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) | |
941 | return TX_DROP; | |
942 | ||
943 | /* update duration/seq/flags of fragments */ | |
944 | fragnum = 0; | |
945 | ||
946 | skb_queue_walk(&tx->skbs, skb) { | |
947 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); | |
948 | ||
949 | hdr = (void *)skb->data; | |
950 | info = IEEE80211_SKB_CB(skb); | |
951 | ||
952 | if (!skb_queue_is_last(&tx->skbs, skb)) { | |
953 | hdr->frame_control |= morefrags; | |
954 | /* | |
955 | * No multi-rate retries for fragmented frames, that | |
956 | * would completely throw off the NAV at other STAs. | |
957 | */ | |
958 | info->control.rates[1].idx = -1; | |
959 | info->control.rates[2].idx = -1; | |
960 | info->control.rates[3].idx = -1; | |
961 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); | |
962 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
963 | } else { | |
964 | hdr->frame_control &= ~morefrags; | |
965 | } | |
966 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); | |
967 | fragnum++; | |
968 | } | |
969 | ||
970 | return TX_CONTINUE; | |
971 | } | |
972 | ||
973 | static ieee80211_tx_result debug_noinline | |
974 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) | |
975 | { | |
976 | struct sk_buff *skb; | |
977 | int ac = -1; | |
978 | ||
979 | if (!tx->sta) | |
980 | return TX_CONTINUE; | |
981 | ||
982 | skb_queue_walk(&tx->skbs, skb) { | |
983 | ac = skb_get_queue_mapping(skb); | |
984 | tx->sta->tx_fragments++; | |
985 | tx->sta->tx_bytes[ac] += skb->len; | |
986 | } | |
987 | if (ac >= 0) | |
988 | tx->sta->tx_packets[ac]++; | |
989 | ||
990 | return TX_CONTINUE; | |
991 | } | |
992 | ||
993 | static ieee80211_tx_result debug_noinline | |
994 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) | |
995 | { | |
996 | if (!tx->key) | |
997 | return TX_CONTINUE; | |
998 | ||
999 | switch (tx->key->conf.cipher) { | |
1000 | case WLAN_CIPHER_SUITE_WEP40: | |
1001 | case WLAN_CIPHER_SUITE_WEP104: | |
1002 | return ieee80211_crypto_wep_encrypt(tx); | |
1003 | case WLAN_CIPHER_SUITE_TKIP: | |
1004 | return ieee80211_crypto_tkip_encrypt(tx); | |
1005 | case WLAN_CIPHER_SUITE_CCMP: | |
1006 | return ieee80211_crypto_ccmp_encrypt(tx); | |
1007 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
1008 | return ieee80211_crypto_aes_cmac_encrypt(tx); | |
1009 | default: | |
1010 | return ieee80211_crypto_hw_encrypt(tx); | |
1011 | } | |
1012 | ||
1013 | return TX_DROP; | |
1014 | } | |
1015 | ||
1016 | static ieee80211_tx_result debug_noinline | |
1017 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) | |
1018 | { | |
1019 | struct sk_buff *skb; | |
1020 | struct ieee80211_hdr *hdr; | |
1021 | int next_len; | |
1022 | bool group_addr; | |
1023 | ||
1024 | skb_queue_walk(&tx->skbs, skb) { | |
1025 | hdr = (void *) skb->data; | |
1026 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) | |
1027 | break; /* must not overwrite AID */ | |
1028 | if (!skb_queue_is_last(&tx->skbs, skb)) { | |
1029 | struct sk_buff *next = skb_queue_next(&tx->skbs, skb); | |
1030 | next_len = next->len; | |
1031 | } else | |
1032 | next_len = 0; | |
1033 | group_addr = is_multicast_ether_addr(hdr->addr1); | |
1034 | ||
1035 | hdr->duration_id = | |
1036 | ieee80211_duration(tx, skb, group_addr, next_len); | |
1037 | } | |
1038 | ||
1039 | return TX_CONTINUE; | |
1040 | } | |
1041 | ||
1042 | /* actual transmit path */ | |
1043 | ||
1044 | static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, | |
1045 | struct sk_buff *skb, | |
1046 | struct ieee80211_tx_info *info, | |
1047 | struct tid_ampdu_tx *tid_tx, | |
1048 | int tid) | |
1049 | { | |
1050 | bool queued = false; | |
1051 | bool reset_agg_timer = false; | |
1052 | struct sk_buff *purge_skb = NULL; | |
1053 | ||
1054 | if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { | |
1055 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
1056 | reset_agg_timer = true; | |
1057 | } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { | |
1058 | /* | |
1059 | * nothing -- this aggregation session is being started | |
1060 | * but that might still fail with the driver | |
1061 | */ | |
1062 | } else { | |
1063 | spin_lock(&tx->sta->lock); | |
1064 | /* | |
1065 | * Need to re-check now, because we may get here | |
1066 | * | |
1067 | * 1) in the window during which the setup is actually | |
1068 | * already done, but not marked yet because not all | |
1069 | * packets are spliced over to the driver pending | |
1070 | * queue yet -- if this happened we acquire the lock | |
1071 | * either before or after the splice happens, but | |
1072 | * need to recheck which of these cases happened. | |
1073 | * | |
1074 | * 2) during session teardown, if the OPERATIONAL bit | |
1075 | * was cleared due to the teardown but the pointer | |
1076 | * hasn't been assigned NULL yet (or we loaded it | |
1077 | * before it was assigned) -- in this case it may | |
1078 | * now be NULL which means we should just let the | |
1079 | * packet pass through because splicing the frames | |
1080 | * back is already done. | |
1081 | */ | |
1082 | tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); | |
1083 | ||
1084 | if (!tid_tx) { | |
1085 | /* do nothing, let packet pass through */ | |
1086 | } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { | |
1087 | info->flags |= IEEE80211_TX_CTL_AMPDU; | |
1088 | reset_agg_timer = true; | |
1089 | } else { | |
1090 | queued = true; | |
1091 | info->control.vif = &tx->sdata->vif; | |
1092 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1093 | info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; | |
1094 | __skb_queue_tail(&tid_tx->pending, skb); | |
1095 | if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) | |
1096 | purge_skb = __skb_dequeue(&tid_tx->pending); | |
1097 | } | |
1098 | spin_unlock(&tx->sta->lock); | |
1099 | ||
1100 | if (purge_skb) | |
1101 | ieee80211_free_txskb(&tx->local->hw, purge_skb); | |
1102 | } | |
1103 | ||
1104 | /* reset session timer */ | |
1105 | if (reset_agg_timer && tid_tx->timeout) | |
1106 | tid_tx->last_tx = jiffies; | |
1107 | ||
1108 | return queued; | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * initialises @tx | |
1113 | */ | |
1114 | static ieee80211_tx_result | |
1115 | ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, | |
1116 | struct ieee80211_tx_data *tx, | |
1117 | struct sk_buff *skb) | |
1118 | { | |
1119 | struct ieee80211_local *local = sdata->local; | |
1120 | struct ieee80211_hdr *hdr; | |
1121 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1122 | int tid; | |
1123 | u8 *qc; | |
1124 | ||
1125 | memset(tx, 0, sizeof(*tx)); | |
1126 | tx->skb = skb; | |
1127 | tx->local = local; | |
1128 | tx->sdata = sdata; | |
1129 | __skb_queue_head_init(&tx->skbs); | |
1130 | ||
1131 | /* | |
1132 | * If this flag is set to true anywhere, and we get here, | |
1133 | * we are doing the needed processing, so remove the flag | |
1134 | * now. | |
1135 | */ | |
1136 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1137 | ||
1138 | hdr = (struct ieee80211_hdr *) skb->data; | |
1139 | ||
1140 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { | |
1141 | tx->sta = rcu_dereference(sdata->u.vlan.sta); | |
1142 | if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) | |
1143 | return TX_DROP; | |
1144 | } else if (info->flags & (IEEE80211_TX_CTL_INJECTED | | |
1145 | IEEE80211_TX_INTFL_NL80211_FRAME_TX) || | |
1146 | tx->sdata->control_port_protocol == tx->skb->protocol) { | |
1147 | tx->sta = sta_info_get_bss(sdata, hdr->addr1); | |
1148 | } | |
1149 | if (!tx->sta) | |
1150 | tx->sta = sta_info_get(sdata, hdr->addr1); | |
1151 | ||
1152 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && | |
1153 | !ieee80211_is_qos_nullfunc(hdr->frame_control) && | |
1154 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && | |
1155 | !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { | |
1156 | struct tid_ampdu_tx *tid_tx; | |
1157 | ||
1158 | qc = ieee80211_get_qos_ctl(hdr); | |
1159 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; | |
1160 | ||
1161 | tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); | |
1162 | if (tid_tx) { | |
1163 | bool queued; | |
1164 | ||
1165 | queued = ieee80211_tx_prep_agg(tx, skb, info, | |
1166 | tid_tx, tid); | |
1167 | ||
1168 | if (unlikely(queued)) | |
1169 | return TX_QUEUED; | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | if (is_multicast_ether_addr(hdr->addr1)) { | |
1174 | tx->flags &= ~IEEE80211_TX_UNICAST; | |
1175 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1176 | } else | |
1177 | tx->flags |= IEEE80211_TX_UNICAST; | |
1178 | ||
1179 | if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { | |
1180 | if (!(tx->flags & IEEE80211_TX_UNICAST) || | |
1181 | skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || | |
1182 | info->flags & IEEE80211_TX_CTL_AMPDU) | |
1183 | info->flags |= IEEE80211_TX_CTL_DONTFRAG; | |
1184 | } | |
1185 | ||
1186 | if (!tx->sta) | |
1187 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; | |
1188 | else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) | |
1189 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; | |
1190 | ||
1191 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; | |
1192 | ||
1193 | return TX_CONTINUE; | |
1194 | } | |
1195 | ||
1196 | static bool ieee80211_tx_frags(struct ieee80211_local *local, | |
1197 | struct ieee80211_vif *vif, | |
1198 | struct ieee80211_sta *sta, | |
1199 | struct sk_buff_head *skbs, | |
1200 | bool txpending) | |
1201 | { | |
1202 | struct ieee80211_tx_control control; | |
1203 | struct sk_buff *skb, *tmp; | |
1204 | unsigned long flags; | |
1205 | ||
1206 | skb_queue_walk_safe(skbs, skb, tmp) { | |
1207 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1208 | int q = info->hw_queue; | |
1209 | ||
1210 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
1211 | if (WARN_ON_ONCE(q >= local->hw.queues)) { | |
1212 | __skb_unlink(skb, skbs); | |
1213 | ieee80211_free_txskb(&local->hw, skb); | |
1214 | continue; | |
1215 | } | |
1216 | #endif | |
1217 | ||
1218 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
1219 | if (local->queue_stop_reasons[q] || | |
1220 | (!txpending && !skb_queue_empty(&local->pending[q]))) { | |
1221 | if (unlikely(info->flags & | |
1222 | IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { | |
1223 | if (local->queue_stop_reasons[q] & | |
1224 | ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { | |
1225 | /* | |
1226 | * Drop off-channel frames if queues | |
1227 | * are stopped for any reason other | |
1228 | * than off-channel operation. Never | |
1229 | * queue them. | |
1230 | */ | |
1231 | spin_unlock_irqrestore( | |
1232 | &local->queue_stop_reason_lock, | |
1233 | flags); | |
1234 | ieee80211_purge_tx_queue(&local->hw, | |
1235 | skbs); | |
1236 | return true; | |
1237 | } | |
1238 | } else { | |
1239 | ||
1240 | /* | |
1241 | * Since queue is stopped, queue up frames for | |
1242 | * later transmission from the tx-pending | |
1243 | * tasklet when the queue is woken again. | |
1244 | */ | |
1245 | if (txpending) | |
1246 | skb_queue_splice_init(skbs, | |
1247 | &local->pending[q]); | |
1248 | else | |
1249 | skb_queue_splice_tail_init(skbs, | |
1250 | &local->pending[q]); | |
1251 | ||
1252 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, | |
1253 | flags); | |
1254 | return false; | |
1255 | } | |
1256 | } | |
1257 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
1258 | ||
1259 | info->control.vif = vif; | |
1260 | control.sta = sta; | |
1261 | ||
1262 | __skb_unlink(skb, skbs); | |
1263 | drv_tx(local, &control, skb); | |
1264 | } | |
1265 | ||
1266 | return true; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Returns false if the frame couldn't be transmitted but was queued instead. | |
1271 | */ | |
1272 | static bool __ieee80211_tx(struct ieee80211_local *local, | |
1273 | struct sk_buff_head *skbs, int led_len, | |
1274 | struct sta_info *sta, bool txpending) | |
1275 | { | |
1276 | struct ieee80211_tx_info *info; | |
1277 | struct ieee80211_sub_if_data *sdata; | |
1278 | struct ieee80211_vif *vif; | |
1279 | struct ieee80211_sta *pubsta; | |
1280 | struct sk_buff *skb; | |
1281 | bool result = true; | |
1282 | __le16 fc; | |
1283 | ||
1284 | if (WARN_ON(skb_queue_empty(skbs))) | |
1285 | return true; | |
1286 | ||
1287 | skb = skb_peek(skbs); | |
1288 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; | |
1289 | info = IEEE80211_SKB_CB(skb); | |
1290 | sdata = vif_to_sdata(info->control.vif); | |
1291 | if (sta && !sta->uploaded) | |
1292 | sta = NULL; | |
1293 | ||
1294 | if (sta) | |
1295 | pubsta = &sta->sta; | |
1296 | else | |
1297 | pubsta = NULL; | |
1298 | ||
1299 | switch (sdata->vif.type) { | |
1300 | case NL80211_IFTYPE_MONITOR: | |
1301 | if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { | |
1302 | vif = &sdata->vif; | |
1303 | break; | |
1304 | } | |
1305 | sdata = rcu_dereference(local->monitor_sdata); | |
1306 | if (sdata) { | |
1307 | vif = &sdata->vif; | |
1308 | info->hw_queue = | |
1309 | vif->hw_queue[skb_get_queue_mapping(skb)]; | |
1310 | } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { | |
1311 | dev_kfree_skb(skb); | |
1312 | return true; | |
1313 | } else | |
1314 | vif = NULL; | |
1315 | break; | |
1316 | case NL80211_IFTYPE_AP_VLAN: | |
1317 | sdata = container_of(sdata->bss, | |
1318 | struct ieee80211_sub_if_data, u.ap); | |
1319 | /* fall through */ | |
1320 | default: | |
1321 | vif = &sdata->vif; | |
1322 | break; | |
1323 | } | |
1324 | ||
1325 | result = ieee80211_tx_frags(local, vif, pubsta, skbs, | |
1326 | txpending); | |
1327 | ||
1328 | ieee80211_tpt_led_trig_tx(local, fc, led_len); | |
1329 | ||
1330 | WARN_ON_ONCE(!skb_queue_empty(skbs)); | |
1331 | ||
1332 | return result; | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Invoke TX handlers, return 0 on success and non-zero if the | |
1337 | * frame was dropped or queued. | |
1338 | */ | |
1339 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) | |
1340 | { | |
1341 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); | |
1342 | ieee80211_tx_result res = TX_DROP; | |
1343 | ||
1344 | #define CALL_TXH(txh) \ | |
1345 | do { \ | |
1346 | res = txh(tx); \ | |
1347 | if (res != TX_CONTINUE) \ | |
1348 | goto txh_done; \ | |
1349 | } while (0) | |
1350 | ||
1351 | CALL_TXH(ieee80211_tx_h_dynamic_ps); | |
1352 | CALL_TXH(ieee80211_tx_h_check_assoc); | |
1353 | CALL_TXH(ieee80211_tx_h_ps_buf); | |
1354 | CALL_TXH(ieee80211_tx_h_check_control_port_protocol); | |
1355 | CALL_TXH(ieee80211_tx_h_select_key); | |
1356 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) | |
1357 | CALL_TXH(ieee80211_tx_h_rate_ctrl); | |
1358 | ||
1359 | if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { | |
1360 | __skb_queue_tail(&tx->skbs, tx->skb); | |
1361 | tx->skb = NULL; | |
1362 | goto txh_done; | |
1363 | } | |
1364 | ||
1365 | CALL_TXH(ieee80211_tx_h_michael_mic_add); | |
1366 | CALL_TXH(ieee80211_tx_h_sequence); | |
1367 | CALL_TXH(ieee80211_tx_h_fragment); | |
1368 | /* handlers after fragment must be aware of tx info fragmentation! */ | |
1369 | CALL_TXH(ieee80211_tx_h_stats); | |
1370 | CALL_TXH(ieee80211_tx_h_encrypt); | |
1371 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) | |
1372 | CALL_TXH(ieee80211_tx_h_calculate_duration); | |
1373 | #undef CALL_TXH | |
1374 | ||
1375 | txh_done: | |
1376 | if (unlikely(res == TX_DROP)) { | |
1377 | I802_DEBUG_INC(tx->local->tx_handlers_drop); | |
1378 | if (tx->skb) | |
1379 | ieee80211_free_txskb(&tx->local->hw, tx->skb); | |
1380 | else | |
1381 | ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); | |
1382 | return -1; | |
1383 | } else if (unlikely(res == TX_QUEUED)) { | |
1384 | I802_DEBUG_INC(tx->local->tx_handlers_queued); | |
1385 | return -1; | |
1386 | } | |
1387 | ||
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, | |
1392 | struct ieee80211_vif *vif, struct sk_buff *skb, | |
1393 | int band, struct ieee80211_sta **sta) | |
1394 | { | |
1395 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1396 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1397 | struct ieee80211_tx_data tx; | |
1398 | ||
1399 | if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP) | |
1400 | return false; | |
1401 | ||
1402 | info->band = band; | |
1403 | info->control.vif = vif; | |
1404 | info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; | |
1405 | ||
1406 | if (invoke_tx_handlers(&tx)) | |
1407 | return false; | |
1408 | ||
1409 | if (sta) { | |
1410 | if (tx.sta) | |
1411 | *sta = &tx.sta->sta; | |
1412 | else | |
1413 | *sta = NULL; | |
1414 | } | |
1415 | ||
1416 | return true; | |
1417 | } | |
1418 | EXPORT_SYMBOL(ieee80211_tx_prepare_skb); | |
1419 | ||
1420 | /* | |
1421 | * Returns false if the frame couldn't be transmitted but was queued instead. | |
1422 | */ | |
1423 | static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, | |
1424 | struct sk_buff *skb, bool txpending, | |
1425 | enum ieee80211_band band) | |
1426 | { | |
1427 | struct ieee80211_local *local = sdata->local; | |
1428 | struct ieee80211_tx_data tx; | |
1429 | ieee80211_tx_result res_prepare; | |
1430 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1431 | bool result = true; | |
1432 | int led_len; | |
1433 | ||
1434 | if (unlikely(skb->len < 10)) { | |
1435 | dev_kfree_skb(skb); | |
1436 | return true; | |
1437 | } | |
1438 | ||
1439 | /* initialises tx */ | |
1440 | led_len = skb->len; | |
1441 | res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); | |
1442 | ||
1443 | if (unlikely(res_prepare == TX_DROP)) { | |
1444 | ieee80211_free_txskb(&local->hw, skb); | |
1445 | return true; | |
1446 | } else if (unlikely(res_prepare == TX_QUEUED)) { | |
1447 | return true; | |
1448 | } | |
1449 | ||
1450 | info->band = band; | |
1451 | ||
1452 | /* set up hw_queue value early */ | |
1453 | if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || | |
1454 | !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) | |
1455 | info->hw_queue = | |
1456 | sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; | |
1457 | ||
1458 | if (!invoke_tx_handlers(&tx)) | |
1459 | result = __ieee80211_tx(local, &tx.skbs, led_len, | |
1460 | tx.sta, txpending); | |
1461 | ||
1462 | return result; | |
1463 | } | |
1464 | ||
1465 | /* device xmit handlers */ | |
1466 | ||
1467 | static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, | |
1468 | struct sk_buff *skb, | |
1469 | int head_need, bool may_encrypt) | |
1470 | { | |
1471 | struct ieee80211_local *local = sdata->local; | |
1472 | int tail_need = 0; | |
1473 | ||
1474 | if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { | |
1475 | tail_need = IEEE80211_ENCRYPT_TAILROOM; | |
1476 | tail_need -= skb_tailroom(skb); | |
1477 | tail_need = max_t(int, tail_need, 0); | |
1478 | } | |
1479 | ||
1480 | if (skb_cloned(skb)) | |
1481 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); | |
1482 | else if (head_need || tail_need) | |
1483 | I802_DEBUG_INC(local->tx_expand_skb_head); | |
1484 | else | |
1485 | return 0; | |
1486 | ||
1487 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { | |
1488 | wiphy_debug(local->hw.wiphy, | |
1489 | "failed to reallocate TX buffer\n"); | |
1490 | return -ENOMEM; | |
1491 | } | |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, | |
1497 | enum ieee80211_band band) | |
1498 | { | |
1499 | struct ieee80211_local *local = sdata->local; | |
1500 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1501 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1502 | int headroom; | |
1503 | bool may_encrypt; | |
1504 | ||
1505 | may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); | |
1506 | ||
1507 | headroom = local->tx_headroom; | |
1508 | if (may_encrypt) | |
1509 | headroom += sdata->encrypt_headroom; | |
1510 | headroom -= skb_headroom(skb); | |
1511 | headroom = max_t(int, 0, headroom); | |
1512 | ||
1513 | if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { | |
1514 | ieee80211_free_txskb(&local->hw, skb); | |
1515 | return; | |
1516 | } | |
1517 | ||
1518 | hdr = (struct ieee80211_hdr *) skb->data; | |
1519 | info->control.vif = &sdata->vif; | |
1520 | ||
1521 | if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
1522 | if (ieee80211_is_data(hdr->frame_control) && | |
1523 | is_unicast_ether_addr(hdr->addr1)) { | |
1524 | if (mesh_nexthop_resolve(sdata, skb)) | |
1525 | return; /* skb queued: don't free */ | |
1526 | } else { | |
1527 | ieee80211_mps_set_frame_flags(sdata, NULL, hdr); | |
1528 | } | |
1529 | } | |
1530 | ||
1531 | ieee80211_set_qos_hdr(sdata, skb); | |
1532 | ieee80211_tx(sdata, skb, false, band); | |
1533 | } | |
1534 | ||
1535 | static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) | |
1536 | { | |
1537 | struct ieee80211_radiotap_iterator iterator; | |
1538 | struct ieee80211_radiotap_header *rthdr = | |
1539 | (struct ieee80211_radiotap_header *) skb->data; | |
1540 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1541 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, | |
1542 | NULL); | |
1543 | u16 txflags; | |
1544 | ||
1545 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | | |
1546 | IEEE80211_TX_CTL_DONTFRAG; | |
1547 | ||
1548 | /* | |
1549 | * for every radiotap entry that is present | |
1550 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more | |
1551 | * entries present, or -EINVAL on error) | |
1552 | */ | |
1553 | ||
1554 | while (!ret) { | |
1555 | ret = ieee80211_radiotap_iterator_next(&iterator); | |
1556 | ||
1557 | if (ret) | |
1558 | continue; | |
1559 | ||
1560 | /* see if this argument is something we can use */ | |
1561 | switch (iterator.this_arg_index) { | |
1562 | /* | |
1563 | * You must take care when dereferencing iterator.this_arg | |
1564 | * for multibyte types... the pointer is not aligned. Use | |
1565 | * get_unaligned((type *)iterator.this_arg) to dereference | |
1566 | * iterator.this_arg for type "type" safely on all arches. | |
1567 | */ | |
1568 | case IEEE80211_RADIOTAP_FLAGS: | |
1569 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { | |
1570 | /* | |
1571 | * this indicates that the skb we have been | |
1572 | * handed has the 32-bit FCS CRC at the end... | |
1573 | * we should react to that by snipping it off | |
1574 | * because it will be recomputed and added | |
1575 | * on transmission | |
1576 | */ | |
1577 | if (skb->len < (iterator._max_length + FCS_LEN)) | |
1578 | return false; | |
1579 | ||
1580 | skb_trim(skb, skb->len - FCS_LEN); | |
1581 | } | |
1582 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) | |
1583 | info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; | |
1584 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) | |
1585 | info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; | |
1586 | break; | |
1587 | ||
1588 | case IEEE80211_RADIOTAP_TX_FLAGS: | |
1589 | txflags = get_unaligned_le16(iterator.this_arg); | |
1590 | if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) | |
1591 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
1592 | break; | |
1593 | ||
1594 | /* | |
1595 | * Please update the file | |
1596 | * Documentation/networking/mac80211-injection.txt | |
1597 | * when parsing new fields here. | |
1598 | */ | |
1599 | ||
1600 | default: | |
1601 | break; | |
1602 | } | |
1603 | } | |
1604 | ||
1605 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ | |
1606 | return false; | |
1607 | ||
1608 | /* | |
1609 | * remove the radiotap header | |
1610 | * iterator->_max_length was sanity-checked against | |
1611 | * skb->len by iterator init | |
1612 | */ | |
1613 | skb_pull(skb, iterator._max_length); | |
1614 | ||
1615 | return true; | |
1616 | } | |
1617 | ||
1618 | netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, | |
1619 | struct net_device *dev) | |
1620 | { | |
1621 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
1622 | struct ieee80211_chanctx_conf *chanctx_conf; | |
1623 | struct ieee80211_channel *chan; | |
1624 | struct ieee80211_radiotap_header *prthdr = | |
1625 | (struct ieee80211_radiotap_header *)skb->data; | |
1626 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1627 | struct ieee80211_hdr *hdr; | |
1628 | struct ieee80211_sub_if_data *tmp_sdata, *sdata; | |
1629 | u16 len_rthdr; | |
1630 | int hdrlen; | |
1631 | ||
1632 | /* check for not even having the fixed radiotap header part */ | |
1633 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) | |
1634 | goto fail; /* too short to be possibly valid */ | |
1635 | ||
1636 | /* is it a header version we can trust to find length from? */ | |
1637 | if (unlikely(prthdr->it_version)) | |
1638 | goto fail; /* only version 0 is supported */ | |
1639 | ||
1640 | /* then there must be a radiotap header with a length we can use */ | |
1641 | len_rthdr = ieee80211_get_radiotap_len(skb->data); | |
1642 | ||
1643 | /* does the skb contain enough to deliver on the alleged length? */ | |
1644 | if (unlikely(skb->len < len_rthdr)) | |
1645 | goto fail; /* skb too short for claimed rt header extent */ | |
1646 | ||
1647 | /* | |
1648 | * fix up the pointers accounting for the radiotap | |
1649 | * header still being in there. We are being given | |
1650 | * a precooked IEEE80211 header so no need for | |
1651 | * normal processing | |
1652 | */ | |
1653 | skb_set_mac_header(skb, len_rthdr); | |
1654 | /* | |
1655 | * these are just fixed to the end of the rt area since we | |
1656 | * don't have any better information and at this point, nobody cares | |
1657 | */ | |
1658 | skb_set_network_header(skb, len_rthdr); | |
1659 | skb_set_transport_header(skb, len_rthdr); | |
1660 | ||
1661 | if (skb->len < len_rthdr + 2) | |
1662 | goto fail; | |
1663 | ||
1664 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); | |
1665 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1666 | ||
1667 | if (skb->len < len_rthdr + hdrlen) | |
1668 | goto fail; | |
1669 | ||
1670 | /* | |
1671 | * Initialize skb->protocol if the injected frame is a data frame | |
1672 | * carrying a rfc1042 header | |
1673 | */ | |
1674 | if (ieee80211_is_data(hdr->frame_control) && | |
1675 | skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { | |
1676 | u8 *payload = (u8 *)hdr + hdrlen; | |
1677 | ||
1678 | if (ether_addr_equal(payload, rfc1042_header)) | |
1679 | skb->protocol = cpu_to_be16((payload[6] << 8) | | |
1680 | payload[7]); | |
1681 | } | |
1682 | ||
1683 | memset(info, 0, sizeof(*info)); | |
1684 | ||
1685 | info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | | |
1686 | IEEE80211_TX_CTL_INJECTED; | |
1687 | ||
1688 | /* process and remove the injection radiotap header */ | |
1689 | if (!ieee80211_parse_tx_radiotap(skb)) | |
1690 | goto fail; | |
1691 | ||
1692 | rcu_read_lock(); | |
1693 | ||
1694 | /* | |
1695 | * We process outgoing injected frames that have a local address | |
1696 | * we handle as though they are non-injected frames. | |
1697 | * This code here isn't entirely correct, the local MAC address | |
1698 | * isn't always enough to find the interface to use; for proper | |
1699 | * VLAN/WDS support we will need a different mechanism (which | |
1700 | * likely isn't going to be monitor interfaces). | |
1701 | */ | |
1702 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1703 | ||
1704 | list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { | |
1705 | if (!ieee80211_sdata_running(tmp_sdata)) | |
1706 | continue; | |
1707 | if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || | |
1708 | tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || | |
1709 | tmp_sdata->vif.type == NL80211_IFTYPE_WDS) | |
1710 | continue; | |
1711 | if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { | |
1712 | sdata = tmp_sdata; | |
1713 | break; | |
1714 | } | |
1715 | } | |
1716 | ||
1717 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1718 | if (!chanctx_conf) { | |
1719 | tmp_sdata = rcu_dereference(local->monitor_sdata); | |
1720 | if (tmp_sdata) | |
1721 | chanctx_conf = | |
1722 | rcu_dereference(tmp_sdata->vif.chanctx_conf); | |
1723 | } | |
1724 | ||
1725 | if (chanctx_conf) | |
1726 | chan = chanctx_conf->def.chan; | |
1727 | else if (!local->use_chanctx) | |
1728 | chan = local->_oper_chandef.chan; | |
1729 | else | |
1730 | goto fail_rcu; | |
1731 | ||
1732 | /* | |
1733 | * Frame injection is not allowed if beaconing is not allowed | |
1734 | * or if we need radar detection. Beaconing is usually not allowed when | |
1735 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. | |
1736 | * Passive scan is also used in world regulatory domains where | |
1737 | * your country is not known and as such it should be treated as | |
1738 | * NO TX unless the channel is explicitly allowed in which case | |
1739 | * your current regulatory domain would not have the passive scan | |
1740 | * flag. | |
1741 | * | |
1742 | * Since AP mode uses monitor interfaces to inject/TX management | |
1743 | * frames we can make AP mode the exception to this rule once it | |
1744 | * supports radar detection as its implementation can deal with | |
1745 | * radar detection by itself. We can do that later by adding a | |
1746 | * monitor flag interfaces used for AP support. | |
1747 | */ | |
1748 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))) | |
1749 | goto fail_rcu; | |
1750 | ||
1751 | ieee80211_xmit(sdata, skb, chan->band); | |
1752 | rcu_read_unlock(); | |
1753 | ||
1754 | return NETDEV_TX_OK; | |
1755 | ||
1756 | fail_rcu: | |
1757 | rcu_read_unlock(); | |
1758 | fail: | |
1759 | dev_kfree_skb(skb); | |
1760 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ | |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * Measure Tx frame arrival time for Tx latency statistics calculation | |
1765 | * A single Tx frame latency should be measured from when it is entering the | |
1766 | * Kernel until we receive Tx complete confirmation indication and the skb is | |
1767 | * freed. | |
1768 | */ | |
1769 | static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local, | |
1770 | struct sk_buff *skb) | |
1771 | { | |
1772 | struct timespec skb_arv; | |
1773 | struct ieee80211_tx_latency_bin_ranges *tx_latency; | |
1774 | ||
1775 | tx_latency = rcu_dereference(local->tx_latency); | |
1776 | if (!tx_latency) | |
1777 | return; | |
1778 | ||
1779 | ktime_get_ts(&skb_arv); | |
1780 | skb->tstamp = ktime_set(skb_arv.tv_sec, skb_arv.tv_nsec); | |
1781 | } | |
1782 | ||
1783 | /** | |
1784 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type | |
1785 | * subinterfaces (wlan#, WDS, and VLAN interfaces) | |
1786 | * @skb: packet to be sent | |
1787 | * @dev: incoming interface | |
1788 | * | |
1789 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will | |
1790 | * not be freed, and caller is responsible for either retrying later or freeing | |
1791 | * skb). | |
1792 | * | |
1793 | * This function takes in an Ethernet header and encapsulates it with suitable | |
1794 | * IEEE 802.11 header based on which interface the packet is coming in. The | |
1795 | * encapsulated packet will then be passed to master interface, wlan#.11, for | |
1796 | * transmission (through low-level driver). | |
1797 | */ | |
1798 | netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, | |
1799 | struct net_device *dev) | |
1800 | { | |
1801 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
1802 | struct ieee80211_local *local = sdata->local; | |
1803 | struct ieee80211_tx_info *info; | |
1804 | int head_need; | |
1805 | u16 ethertype, hdrlen, meshhdrlen = 0; | |
1806 | __le16 fc; | |
1807 | struct ieee80211_hdr hdr; | |
1808 | struct ieee80211s_hdr mesh_hdr __maybe_unused; | |
1809 | struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; | |
1810 | const u8 *encaps_data; | |
1811 | int encaps_len, skip_header_bytes; | |
1812 | int nh_pos, h_pos; | |
1813 | struct sta_info *sta = NULL; | |
1814 | bool wme_sta = false, authorized = false, tdls_auth = false; | |
1815 | bool tdls_direct = false; | |
1816 | bool multicast; | |
1817 | u32 info_flags = 0; | |
1818 | u16 info_id = 0; | |
1819 | struct ieee80211_chanctx_conf *chanctx_conf; | |
1820 | struct ieee80211_sub_if_data *ap_sdata; | |
1821 | enum ieee80211_band band; | |
1822 | ||
1823 | if (unlikely(skb->len < ETH_HLEN)) | |
1824 | goto fail; | |
1825 | ||
1826 | /* convert Ethernet header to proper 802.11 header (based on | |
1827 | * operation mode) */ | |
1828 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
1829 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); | |
1830 | ||
1831 | rcu_read_lock(); | |
1832 | ||
1833 | /* Measure frame arrival for Tx latency statistics calculation */ | |
1834 | ieee80211_tx_latency_start_msrmnt(local, skb); | |
1835 | ||
1836 | switch (sdata->vif.type) { | |
1837 | case NL80211_IFTYPE_AP_VLAN: | |
1838 | sta = rcu_dereference(sdata->u.vlan.sta); | |
1839 | if (sta) { | |
1840 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); | |
1841 | /* RA TA DA SA */ | |
1842 | memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); | |
1843 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); | |
1844 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1845 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1846 | hdrlen = 30; | |
1847 | authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); | |
1848 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); | |
1849 | } | |
1850 | ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, | |
1851 | u.ap); | |
1852 | chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); | |
1853 | if (!chanctx_conf) | |
1854 | goto fail_rcu; | |
1855 | band = chanctx_conf->def.chan->band; | |
1856 | if (sta) | |
1857 | break; | |
1858 | /* fall through */ | |
1859 | case NL80211_IFTYPE_AP: | |
1860 | if (sdata->vif.type == NL80211_IFTYPE_AP) | |
1861 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1862 | if (!chanctx_conf) | |
1863 | goto fail_rcu; | |
1864 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); | |
1865 | /* DA BSSID SA */ | |
1866 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1867 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); | |
1868 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); | |
1869 | hdrlen = 24; | |
1870 | band = chanctx_conf->def.chan->band; | |
1871 | break; | |
1872 | case NL80211_IFTYPE_WDS: | |
1873 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); | |
1874 | /* RA TA DA SA */ | |
1875 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); | |
1876 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); | |
1877 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1878 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1879 | hdrlen = 30; | |
1880 | /* | |
1881 | * This is the exception! WDS style interfaces are prohibited | |
1882 | * when channel contexts are in used so this must be valid | |
1883 | */ | |
1884 | band = local->hw.conf.chandef.chan->band; | |
1885 | break; | |
1886 | #ifdef CONFIG_MAC80211_MESH | |
1887 | case NL80211_IFTYPE_MESH_POINT: | |
1888 | if (!is_multicast_ether_addr(skb->data)) { | |
1889 | struct sta_info *next_hop; | |
1890 | bool mpp_lookup = true; | |
1891 | ||
1892 | mpath = mesh_path_lookup(sdata, skb->data); | |
1893 | if (mpath) { | |
1894 | mpp_lookup = false; | |
1895 | next_hop = rcu_dereference(mpath->next_hop); | |
1896 | if (!next_hop || | |
1897 | !(mpath->flags & (MESH_PATH_ACTIVE | | |
1898 | MESH_PATH_RESOLVING))) | |
1899 | mpp_lookup = true; | |
1900 | } | |
1901 | ||
1902 | if (mpp_lookup) | |
1903 | mppath = mpp_path_lookup(sdata, skb->data); | |
1904 | ||
1905 | if (mppath && mpath) | |
1906 | mesh_path_del(mpath->sdata, mpath->dst); | |
1907 | } | |
1908 | ||
1909 | /* | |
1910 | * Use address extension if it is a packet from | |
1911 | * another interface or if we know the destination | |
1912 | * is being proxied by a portal (i.e. portal address | |
1913 | * differs from proxied address) | |
1914 | */ | |
1915 | if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && | |
1916 | !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { | |
1917 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, | |
1918 | skb->data, skb->data + ETH_ALEN); | |
1919 | meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, | |
1920 | NULL, NULL); | |
1921 | } else { | |
1922 | /* DS -> MBSS (802.11-2012 13.11.3.3). | |
1923 | * For unicast with unknown forwarding information, | |
1924 | * destination might be in the MBSS or if that fails | |
1925 | * forwarded to another mesh gate. In either case | |
1926 | * resolution will be handled in ieee80211_xmit(), so | |
1927 | * leave the original DA. This also works for mcast */ | |
1928 | const u8 *mesh_da = skb->data; | |
1929 | ||
1930 | if (mppath) | |
1931 | mesh_da = mppath->mpp; | |
1932 | else if (mpath) | |
1933 | mesh_da = mpath->dst; | |
1934 | ||
1935 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, | |
1936 | mesh_da, sdata->vif.addr); | |
1937 | if (is_multicast_ether_addr(mesh_da)) | |
1938 | /* DA TA mSA AE:SA */ | |
1939 | meshhdrlen = ieee80211_new_mesh_header( | |
1940 | sdata, &mesh_hdr, | |
1941 | skb->data + ETH_ALEN, NULL); | |
1942 | else | |
1943 | /* RA TA mDA mSA AE:DA SA */ | |
1944 | meshhdrlen = ieee80211_new_mesh_header( | |
1945 | sdata, &mesh_hdr, skb->data, | |
1946 | skb->data + ETH_ALEN); | |
1947 | ||
1948 | } | |
1949 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
1950 | if (!chanctx_conf) | |
1951 | goto fail_rcu; | |
1952 | band = chanctx_conf->def.chan->band; | |
1953 | break; | |
1954 | #endif | |
1955 | case NL80211_IFTYPE_STATION: | |
1956 | if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { | |
1957 | bool tdls_peer = false; | |
1958 | ||
1959 | sta = sta_info_get(sdata, skb->data); | |
1960 | if (sta) { | |
1961 | authorized = test_sta_flag(sta, | |
1962 | WLAN_STA_AUTHORIZED); | |
1963 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); | |
1964 | tdls_peer = test_sta_flag(sta, | |
1965 | WLAN_STA_TDLS_PEER); | |
1966 | tdls_auth = test_sta_flag(sta, | |
1967 | WLAN_STA_TDLS_PEER_AUTH); | |
1968 | } | |
1969 | ||
1970 | /* | |
1971 | * If the TDLS link is enabled, send everything | |
1972 | * directly. Otherwise, allow TDLS setup frames | |
1973 | * to be transmitted indirectly. | |
1974 | */ | |
1975 | tdls_direct = tdls_peer && (tdls_auth || | |
1976 | !(ethertype == ETH_P_TDLS && skb->len > 14 && | |
1977 | skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); | |
1978 | } | |
1979 | ||
1980 | if (tdls_direct) { | |
1981 | /* link during setup - throw out frames to peer */ | |
1982 | if (!tdls_auth) | |
1983 | goto fail_rcu; | |
1984 | ||
1985 | /* DA SA BSSID */ | |
1986 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
1987 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
1988 | memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); | |
1989 | hdrlen = 24; | |
1990 | } else if (sdata->u.mgd.use_4addr && | |
1991 | cpu_to_be16(ethertype) != sdata->control_port_protocol) { | |
1992 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | | |
1993 | IEEE80211_FCTL_TODS); | |
1994 | /* RA TA DA SA */ | |
1995 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); | |
1996 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); | |
1997 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
1998 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); | |
1999 | hdrlen = 30; | |
2000 | } else { | |
2001 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); | |
2002 | /* BSSID SA DA */ | |
2003 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); | |
2004 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
2005 | memcpy(hdr.addr3, skb->data, ETH_ALEN); | |
2006 | hdrlen = 24; | |
2007 | } | |
2008 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
2009 | if (!chanctx_conf) | |
2010 | goto fail_rcu; | |
2011 | band = chanctx_conf->def.chan->band; | |
2012 | break; | |
2013 | case NL80211_IFTYPE_ADHOC: | |
2014 | /* DA SA BSSID */ | |
2015 | memcpy(hdr.addr1, skb->data, ETH_ALEN); | |
2016 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); | |
2017 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); | |
2018 | hdrlen = 24; | |
2019 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
2020 | if (!chanctx_conf) | |
2021 | goto fail_rcu; | |
2022 | band = chanctx_conf->def.chan->band; | |
2023 | break; | |
2024 | default: | |
2025 | goto fail_rcu; | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * There's no need to try to look up the destination | |
2030 | * if it is a multicast address (which can only happen | |
2031 | * in AP mode) | |
2032 | */ | |
2033 | multicast = is_multicast_ether_addr(hdr.addr1); | |
2034 | if (!multicast) { | |
2035 | sta = sta_info_get(sdata, hdr.addr1); | |
2036 | if (sta) { | |
2037 | authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); | |
2038 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); | |
2039 | } | |
2040 | } | |
2041 | ||
2042 | /* For mesh, the use of the QoS header is mandatory */ | |
2043 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
2044 | wme_sta = true; | |
2045 | ||
2046 | /* receiver and we are QoS enabled, use a QoS type frame */ | |
2047 | if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { | |
2048 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); | |
2049 | hdrlen += 2; | |
2050 | } | |
2051 | ||
2052 | /* | |
2053 | * Drop unicast frames to unauthorised stations unless they are | |
2054 | * EAPOL frames from the local station. | |
2055 | */ | |
2056 | if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && | |
2057 | !multicast && !authorized && | |
2058 | (cpu_to_be16(ethertype) != sdata->control_port_protocol || | |
2059 | !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { | |
2060 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
2061 | net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", | |
2062 | dev->name, hdr.addr1); | |
2063 | #endif | |
2064 | ||
2065 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); | |
2066 | ||
2067 | goto fail_rcu; | |
2068 | } | |
2069 | ||
2070 | if (unlikely(!multicast && skb->sk && | |
2071 | skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { | |
2072 | struct sk_buff *orig_skb = skb; | |
2073 | ||
2074 | skb = skb_clone(skb, GFP_ATOMIC); | |
2075 | if (skb) { | |
2076 | unsigned long flags; | |
2077 | int id; | |
2078 | ||
2079 | spin_lock_irqsave(&local->ack_status_lock, flags); | |
2080 | id = idr_alloc(&local->ack_status_frames, orig_skb, | |
2081 | 1, 0x10000, GFP_ATOMIC); | |
2082 | spin_unlock_irqrestore(&local->ack_status_lock, flags); | |
2083 | ||
2084 | if (id >= 0) { | |
2085 | info_id = id; | |
2086 | info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
2087 | } else if (skb_shared(skb)) { | |
2088 | kfree_skb(orig_skb); | |
2089 | } else { | |
2090 | kfree_skb(skb); | |
2091 | skb = orig_skb; | |
2092 | } | |
2093 | } else { | |
2094 | /* couldn't clone -- lose tx status ... */ | |
2095 | skb = orig_skb; | |
2096 | } | |
2097 | } | |
2098 | ||
2099 | /* | |
2100 | * If the skb is shared we need to obtain our own copy. | |
2101 | */ | |
2102 | if (skb_shared(skb)) { | |
2103 | struct sk_buff *tmp_skb = skb; | |
2104 | ||
2105 | /* can't happen -- skb is a clone if info_id != 0 */ | |
2106 | WARN_ON(info_id); | |
2107 | ||
2108 | skb = skb_clone(skb, GFP_ATOMIC); | |
2109 | kfree_skb(tmp_skb); | |
2110 | ||
2111 | if (!skb) | |
2112 | goto fail_rcu; | |
2113 | } | |
2114 | ||
2115 | hdr.frame_control = fc; | |
2116 | hdr.duration_id = 0; | |
2117 | hdr.seq_ctrl = 0; | |
2118 | ||
2119 | skip_header_bytes = ETH_HLEN; | |
2120 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
2121 | encaps_data = bridge_tunnel_header; | |
2122 | encaps_len = sizeof(bridge_tunnel_header); | |
2123 | skip_header_bytes -= 2; | |
2124 | } else if (ethertype >= ETH_P_802_3_MIN) { | |
2125 | encaps_data = rfc1042_header; | |
2126 | encaps_len = sizeof(rfc1042_header); | |
2127 | skip_header_bytes -= 2; | |
2128 | } else { | |
2129 | encaps_data = NULL; | |
2130 | encaps_len = 0; | |
2131 | } | |
2132 | ||
2133 | nh_pos = skb_network_header(skb) - skb->data; | |
2134 | h_pos = skb_transport_header(skb) - skb->data; | |
2135 | ||
2136 | skb_pull(skb, skip_header_bytes); | |
2137 | nh_pos -= skip_header_bytes; | |
2138 | h_pos -= skip_header_bytes; | |
2139 | ||
2140 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); | |
2141 | ||
2142 | /* | |
2143 | * So we need to modify the skb header and hence need a copy of | |
2144 | * that. The head_need variable above doesn't, so far, include | |
2145 | * the needed header space that we don't need right away. If we | |
2146 | * can, then we don't reallocate right now but only after the | |
2147 | * frame arrives at the master device (if it does...) | |
2148 | * | |
2149 | * If we cannot, however, then we will reallocate to include all | |
2150 | * the ever needed space. Also, if we need to reallocate it anyway, | |
2151 | * make it big enough for everything we may ever need. | |
2152 | */ | |
2153 | ||
2154 | if (head_need > 0 || skb_cloned(skb)) { | |
2155 | head_need += sdata->encrypt_headroom; | |
2156 | head_need += local->tx_headroom; | |
2157 | head_need = max_t(int, 0, head_need); | |
2158 | if (ieee80211_skb_resize(sdata, skb, head_need, true)) { | |
2159 | ieee80211_free_txskb(&local->hw, skb); | |
2160 | skb = NULL; | |
2161 | goto fail_rcu; | |
2162 | } | |
2163 | } | |
2164 | ||
2165 | if (encaps_data) { | |
2166 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
2167 | nh_pos += encaps_len; | |
2168 | h_pos += encaps_len; | |
2169 | } | |
2170 | ||
2171 | #ifdef CONFIG_MAC80211_MESH | |
2172 | if (meshhdrlen > 0) { | |
2173 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); | |
2174 | nh_pos += meshhdrlen; | |
2175 | h_pos += meshhdrlen; | |
2176 | } | |
2177 | #endif | |
2178 | ||
2179 | if (ieee80211_is_data_qos(fc)) { | |
2180 | __le16 *qos_control; | |
2181 | ||
2182 | qos_control = (__le16 *) skb_push(skb, 2); | |
2183 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); | |
2184 | /* | |
2185 | * Maybe we could actually set some fields here, for now just | |
2186 | * initialise to zero to indicate no special operation. | |
2187 | */ | |
2188 | *qos_control = 0; | |
2189 | } else | |
2190 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); | |
2191 | ||
2192 | nh_pos += hdrlen; | |
2193 | h_pos += hdrlen; | |
2194 | ||
2195 | dev->stats.tx_packets++; | |
2196 | dev->stats.tx_bytes += skb->len; | |
2197 | ||
2198 | /* Update skb pointers to various headers since this modified frame | |
2199 | * is going to go through Linux networking code that may potentially | |
2200 | * need things like pointer to IP header. */ | |
2201 | skb_set_mac_header(skb, 0); | |
2202 | skb_set_network_header(skb, nh_pos); | |
2203 | skb_set_transport_header(skb, h_pos); | |
2204 | ||
2205 | info = IEEE80211_SKB_CB(skb); | |
2206 | memset(info, 0, sizeof(*info)); | |
2207 | ||
2208 | dev->trans_start = jiffies; | |
2209 | ||
2210 | info->flags = info_flags; | |
2211 | info->ack_frame_id = info_id; | |
2212 | ||
2213 | ieee80211_xmit(sdata, skb, band); | |
2214 | rcu_read_unlock(); | |
2215 | ||
2216 | return NETDEV_TX_OK; | |
2217 | ||
2218 | fail_rcu: | |
2219 | rcu_read_unlock(); | |
2220 | fail: | |
2221 | dev_kfree_skb(skb); | |
2222 | return NETDEV_TX_OK; | |
2223 | } | |
2224 | ||
2225 | ||
2226 | /* | |
2227 | * ieee80211_clear_tx_pending may not be called in a context where | |
2228 | * it is possible that it packets could come in again. | |
2229 | */ | |
2230 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) | |
2231 | { | |
2232 | struct sk_buff *skb; | |
2233 | int i; | |
2234 | ||
2235 | for (i = 0; i < local->hw.queues; i++) { | |
2236 | while ((skb = skb_dequeue(&local->pending[i])) != NULL) | |
2237 | ieee80211_free_txskb(&local->hw, skb); | |
2238 | } | |
2239 | } | |
2240 | ||
2241 | /* | |
2242 | * Returns false if the frame couldn't be transmitted but was queued instead, | |
2243 | * which in this case means re-queued -- take as an indication to stop sending | |
2244 | * more pending frames. | |
2245 | */ | |
2246 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, | |
2247 | struct sk_buff *skb) | |
2248 | { | |
2249 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2250 | struct ieee80211_sub_if_data *sdata; | |
2251 | struct sta_info *sta; | |
2252 | struct ieee80211_hdr *hdr; | |
2253 | bool result; | |
2254 | struct ieee80211_chanctx_conf *chanctx_conf; | |
2255 | ||
2256 | sdata = vif_to_sdata(info->control.vif); | |
2257 | ||
2258 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { | |
2259 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
2260 | if (unlikely(!chanctx_conf)) { | |
2261 | dev_kfree_skb(skb); | |
2262 | return true; | |
2263 | } | |
2264 | result = ieee80211_tx(sdata, skb, true, | |
2265 | chanctx_conf->def.chan->band); | |
2266 | } else { | |
2267 | struct sk_buff_head skbs; | |
2268 | ||
2269 | __skb_queue_head_init(&skbs); | |
2270 | __skb_queue_tail(&skbs, skb); | |
2271 | ||
2272 | hdr = (struct ieee80211_hdr *)skb->data; | |
2273 | sta = sta_info_get(sdata, hdr->addr1); | |
2274 | ||
2275 | result = __ieee80211_tx(local, &skbs, skb->len, sta, true); | |
2276 | } | |
2277 | ||
2278 | return result; | |
2279 | } | |
2280 | ||
2281 | /* | |
2282 | * Transmit all pending packets. Called from tasklet. | |
2283 | */ | |
2284 | void ieee80211_tx_pending(unsigned long data) | |
2285 | { | |
2286 | struct ieee80211_local *local = (struct ieee80211_local *)data; | |
2287 | unsigned long flags; | |
2288 | int i; | |
2289 | bool txok; | |
2290 | ||
2291 | rcu_read_lock(); | |
2292 | ||
2293 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); | |
2294 | for (i = 0; i < local->hw.queues; i++) { | |
2295 | /* | |
2296 | * If queue is stopped by something other than due to pending | |
2297 | * frames, or we have no pending frames, proceed to next queue. | |
2298 | */ | |
2299 | if (local->queue_stop_reasons[i] || | |
2300 | skb_queue_empty(&local->pending[i])) | |
2301 | continue; | |
2302 | ||
2303 | while (!skb_queue_empty(&local->pending[i])) { | |
2304 | struct sk_buff *skb = __skb_dequeue(&local->pending[i]); | |
2305 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2306 | ||
2307 | if (WARN_ON(!info->control.vif)) { | |
2308 | ieee80211_free_txskb(&local->hw, skb); | |
2309 | continue; | |
2310 | } | |
2311 | ||
2312 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, | |
2313 | flags); | |
2314 | ||
2315 | txok = ieee80211_tx_pending_skb(local, skb); | |
2316 | spin_lock_irqsave(&local->queue_stop_reason_lock, | |
2317 | flags); | |
2318 | if (!txok) | |
2319 | break; | |
2320 | } | |
2321 | ||
2322 | if (skb_queue_empty(&local->pending[i])) | |
2323 | ieee80211_propagate_queue_wake(local, i); | |
2324 | } | |
2325 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); | |
2326 | ||
2327 | rcu_read_unlock(); | |
2328 | } | |
2329 | ||
2330 | /* functions for drivers to get certain frames */ | |
2331 | ||
2332 | static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, | |
2333 | struct ps_data *ps, struct sk_buff *skb, | |
2334 | bool is_template) | |
2335 | { | |
2336 | u8 *pos, *tim; | |
2337 | int aid0 = 0; | |
2338 | int i, have_bits = 0, n1, n2; | |
2339 | ||
2340 | /* Generate bitmap for TIM only if there are any STAs in power save | |
2341 | * mode. */ | |
2342 | if (atomic_read(&ps->num_sta_ps) > 0) | |
2343 | /* in the hope that this is faster than | |
2344 | * checking byte-for-byte */ | |
2345 | have_bits = !bitmap_empty((unsigned long *)ps->tim, | |
2346 | IEEE80211_MAX_AID+1); | |
2347 | if (!is_template) { | |
2348 | if (ps->dtim_count == 0) | |
2349 | ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; | |
2350 | else | |
2351 | ps->dtim_count--; | |
2352 | } | |
2353 | ||
2354 | tim = pos = (u8 *) skb_put(skb, 6); | |
2355 | *pos++ = WLAN_EID_TIM; | |
2356 | *pos++ = 4; | |
2357 | *pos++ = ps->dtim_count; | |
2358 | *pos++ = sdata->vif.bss_conf.dtim_period; | |
2359 | ||
2360 | if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) | |
2361 | aid0 = 1; | |
2362 | ||
2363 | ps->dtim_bc_mc = aid0 == 1; | |
2364 | ||
2365 | if (have_bits) { | |
2366 | /* Find largest even number N1 so that bits numbered 1 through | |
2367 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits | |
2368 | * (N2 + 1) x 8 through 2007 are 0. */ | |
2369 | n1 = 0; | |
2370 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { | |
2371 | if (ps->tim[i]) { | |
2372 | n1 = i & 0xfe; | |
2373 | break; | |
2374 | } | |
2375 | } | |
2376 | n2 = n1; | |
2377 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { | |
2378 | if (ps->tim[i]) { | |
2379 | n2 = i; | |
2380 | break; | |
2381 | } | |
2382 | } | |
2383 | ||
2384 | /* Bitmap control */ | |
2385 | *pos++ = n1 | aid0; | |
2386 | /* Part Virt Bitmap */ | |
2387 | skb_put(skb, n2 - n1); | |
2388 | memcpy(pos, ps->tim + n1, n2 - n1 + 1); | |
2389 | ||
2390 | tim[1] = n2 - n1 + 4; | |
2391 | } else { | |
2392 | *pos++ = aid0; /* Bitmap control */ | |
2393 | *pos++ = 0; /* Part Virt Bitmap */ | |
2394 | } | |
2395 | } | |
2396 | ||
2397 | static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, | |
2398 | struct ps_data *ps, struct sk_buff *skb, | |
2399 | bool is_template) | |
2400 | { | |
2401 | struct ieee80211_local *local = sdata->local; | |
2402 | ||
2403 | /* | |
2404 | * Not very nice, but we want to allow the driver to call | |
2405 | * ieee80211_beacon_get() as a response to the set_tim() | |
2406 | * callback. That, however, is already invoked under the | |
2407 | * sta_lock to guarantee consistent and race-free update | |
2408 | * of the tim bitmap in mac80211 and the driver. | |
2409 | */ | |
2410 | if (local->tim_in_locked_section) { | |
2411 | __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); | |
2412 | } else { | |
2413 | spin_lock_bh(&local->tim_lock); | |
2414 | __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); | |
2415 | spin_unlock_bh(&local->tim_lock); | |
2416 | } | |
2417 | ||
2418 | return 0; | |
2419 | } | |
2420 | ||
2421 | static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, | |
2422 | struct beacon_data *beacon) | |
2423 | { | |
2424 | struct probe_resp *resp; | |
2425 | u8 *beacon_data; | |
2426 | size_t beacon_data_len; | |
2427 | int i; | |
2428 | u8 count = sdata->csa_current_counter; | |
2429 | ||
2430 | switch (sdata->vif.type) { | |
2431 | case NL80211_IFTYPE_AP: | |
2432 | beacon_data = beacon->tail; | |
2433 | beacon_data_len = beacon->tail_len; | |
2434 | break; | |
2435 | case NL80211_IFTYPE_ADHOC: | |
2436 | beacon_data = beacon->head; | |
2437 | beacon_data_len = beacon->head_len; | |
2438 | break; | |
2439 | case NL80211_IFTYPE_MESH_POINT: | |
2440 | beacon_data = beacon->head; | |
2441 | beacon_data_len = beacon->head_len; | |
2442 | break; | |
2443 | default: | |
2444 | return; | |
2445 | } | |
2446 | ||
2447 | for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { | |
2448 | u16 counter_offset_beacon = | |
2449 | sdata->csa_counter_offset_beacon[i]; | |
2450 | u16 counter_offset_presp = sdata->csa_counter_offset_presp[i]; | |
2451 | ||
2452 | if (counter_offset_beacon) { | |
2453 | if (WARN_ON(counter_offset_beacon >= beacon_data_len)) | |
2454 | return; | |
2455 | ||
2456 | beacon_data[counter_offset_beacon] = count; | |
2457 | } | |
2458 | ||
2459 | if (sdata->vif.type == NL80211_IFTYPE_AP && | |
2460 | counter_offset_presp) { | |
2461 | rcu_read_lock(); | |
2462 | resp = rcu_dereference(sdata->u.ap.probe_resp); | |
2463 | ||
2464 | /* If nl80211 accepted the offset, this should | |
2465 | * not happen. | |
2466 | */ | |
2467 | if (WARN_ON(!resp)) { | |
2468 | rcu_read_unlock(); | |
2469 | return; | |
2470 | } | |
2471 | resp->data[counter_offset_presp] = count; | |
2472 | rcu_read_unlock(); | |
2473 | } | |
2474 | } | |
2475 | } | |
2476 | ||
2477 | u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) | |
2478 | { | |
2479 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
2480 | ||
2481 | sdata->csa_current_counter--; | |
2482 | ||
2483 | /* the counter should never reach 0 */ | |
2484 | WARN_ON(!sdata->csa_current_counter); | |
2485 | ||
2486 | return sdata->csa_current_counter; | |
2487 | } | |
2488 | EXPORT_SYMBOL(ieee80211_csa_update_counter); | |
2489 | ||
2490 | bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) | |
2491 | { | |
2492 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
2493 | struct beacon_data *beacon = NULL; | |
2494 | u8 *beacon_data; | |
2495 | size_t beacon_data_len; | |
2496 | int counter_beacon = sdata->csa_counter_offset_beacon[0]; | |
2497 | int ret = false; | |
2498 | ||
2499 | if (!ieee80211_sdata_running(sdata)) | |
2500 | return false; | |
2501 | ||
2502 | rcu_read_lock(); | |
2503 | if (vif->type == NL80211_IFTYPE_AP) { | |
2504 | struct ieee80211_if_ap *ap = &sdata->u.ap; | |
2505 | ||
2506 | beacon = rcu_dereference(ap->beacon); | |
2507 | if (WARN_ON(!beacon || !beacon->tail)) | |
2508 | goto out; | |
2509 | beacon_data = beacon->tail; | |
2510 | beacon_data_len = beacon->tail_len; | |
2511 | } else if (vif->type == NL80211_IFTYPE_ADHOC) { | |
2512 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
2513 | ||
2514 | beacon = rcu_dereference(ifibss->presp); | |
2515 | if (!beacon) | |
2516 | goto out; | |
2517 | ||
2518 | beacon_data = beacon->head; | |
2519 | beacon_data_len = beacon->head_len; | |
2520 | } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { | |
2521 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
2522 | ||
2523 | beacon = rcu_dereference(ifmsh->beacon); | |
2524 | if (!beacon) | |
2525 | goto out; | |
2526 | ||
2527 | beacon_data = beacon->head; | |
2528 | beacon_data_len = beacon->head_len; | |
2529 | } else { | |
2530 | WARN_ON(1); | |
2531 | goto out; | |
2532 | } | |
2533 | ||
2534 | if (WARN_ON(counter_beacon > beacon_data_len)) | |
2535 | goto out; | |
2536 | ||
2537 | if (beacon_data[counter_beacon] == 1) | |
2538 | ret = true; | |
2539 | out: | |
2540 | rcu_read_unlock(); | |
2541 | ||
2542 | return ret; | |
2543 | } | |
2544 | EXPORT_SYMBOL(ieee80211_csa_is_complete); | |
2545 | ||
2546 | static struct sk_buff * | |
2547 | __ieee80211_beacon_get(struct ieee80211_hw *hw, | |
2548 | struct ieee80211_vif *vif, | |
2549 | struct ieee80211_mutable_offsets *offs, | |
2550 | bool is_template) | |
2551 | { | |
2552 | struct ieee80211_local *local = hw_to_local(hw); | |
2553 | struct sk_buff *skb = NULL; | |
2554 | struct ieee80211_tx_info *info; | |
2555 | struct ieee80211_sub_if_data *sdata = NULL; | |
2556 | enum ieee80211_band band; | |
2557 | struct ieee80211_tx_rate_control txrc; | |
2558 | struct ieee80211_chanctx_conf *chanctx_conf; | |
2559 | int csa_off_base = 0; | |
2560 | ||
2561 | rcu_read_lock(); | |
2562 | ||
2563 | sdata = vif_to_sdata(vif); | |
2564 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
2565 | ||
2566 | if (!ieee80211_sdata_running(sdata) || !chanctx_conf) | |
2567 | goto out; | |
2568 | ||
2569 | if (offs) | |
2570 | memset(offs, 0, sizeof(*offs)); | |
2571 | ||
2572 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
2573 | struct ieee80211_if_ap *ap = &sdata->u.ap; | |
2574 | struct beacon_data *beacon = rcu_dereference(ap->beacon); | |
2575 | ||
2576 | if (beacon) { | |
2577 | if (sdata->vif.csa_active) { | |
2578 | if (!is_template) | |
2579 | ieee80211_csa_update_counter(vif); | |
2580 | ||
2581 | ieee80211_set_csa(sdata, beacon); | |
2582 | } | |
2583 | ||
2584 | /* | |
2585 | * headroom, head length, | |
2586 | * tail length and maximum TIM length | |
2587 | */ | |
2588 | skb = dev_alloc_skb(local->tx_headroom + | |
2589 | beacon->head_len + | |
2590 | beacon->tail_len + 256 + | |
2591 | local->hw.extra_beacon_tailroom); | |
2592 | if (!skb) | |
2593 | goto out; | |
2594 | ||
2595 | skb_reserve(skb, local->tx_headroom); | |
2596 | memcpy(skb_put(skb, beacon->head_len), beacon->head, | |
2597 | beacon->head_len); | |
2598 | ||
2599 | ieee80211_beacon_add_tim(sdata, &ap->ps, skb, | |
2600 | is_template); | |
2601 | ||
2602 | if (offs) { | |
2603 | offs->tim_offset = beacon->head_len; | |
2604 | offs->tim_length = skb->len - beacon->head_len; | |
2605 | ||
2606 | /* for AP the csa offsets are from tail */ | |
2607 | csa_off_base = skb->len; | |
2608 | } | |
2609 | ||
2610 | if (beacon->tail) | |
2611 | memcpy(skb_put(skb, beacon->tail_len), | |
2612 | beacon->tail, beacon->tail_len); | |
2613 | } else | |
2614 | goto out; | |
2615 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
2616 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; | |
2617 | struct ieee80211_hdr *hdr; | |
2618 | struct beacon_data *presp = rcu_dereference(ifibss->presp); | |
2619 | ||
2620 | if (!presp) | |
2621 | goto out; | |
2622 | ||
2623 | if (sdata->vif.csa_active) { | |
2624 | if (!is_template) | |
2625 | ieee80211_csa_update_counter(vif); | |
2626 | ||
2627 | ieee80211_set_csa(sdata, presp); | |
2628 | } | |
2629 | ||
2630 | skb = dev_alloc_skb(local->tx_headroom + presp->head_len + | |
2631 | local->hw.extra_beacon_tailroom); | |
2632 | if (!skb) | |
2633 | goto out; | |
2634 | skb_reserve(skb, local->tx_headroom); | |
2635 | memcpy(skb_put(skb, presp->head_len), presp->head, | |
2636 | presp->head_len); | |
2637 | ||
2638 | hdr = (struct ieee80211_hdr *) skb->data; | |
2639 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
2640 | IEEE80211_STYPE_BEACON); | |
2641 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
2642 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
2643 | struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); | |
2644 | ||
2645 | if (!bcn) | |
2646 | goto out; | |
2647 | ||
2648 | if (sdata->vif.csa_active) { | |
2649 | if (!is_template) | |
2650 | /* TODO: For mesh csa_counter is in TU, so | |
2651 | * decrementing it by one isn't correct, but | |
2652 | * for now we leave it consistent with overall | |
2653 | * mac80211's behavior. | |
2654 | */ | |
2655 | ieee80211_csa_update_counter(vif); | |
2656 | ||
2657 | ieee80211_set_csa(sdata, bcn); | |
2658 | } | |
2659 | ||
2660 | if (ifmsh->sync_ops) | |
2661 | ifmsh->sync_ops->adjust_tbtt(sdata, bcn); | |
2662 | ||
2663 | skb = dev_alloc_skb(local->tx_headroom + | |
2664 | bcn->head_len + | |
2665 | 256 + /* TIM IE */ | |
2666 | bcn->tail_len + | |
2667 | local->hw.extra_beacon_tailroom); | |
2668 | if (!skb) | |
2669 | goto out; | |
2670 | skb_reserve(skb, local->tx_headroom); | |
2671 | memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); | |
2672 | ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); | |
2673 | ||
2674 | if (offs) { | |
2675 | offs->tim_offset = bcn->head_len; | |
2676 | offs->tim_length = skb->len - bcn->head_len; | |
2677 | } | |
2678 | ||
2679 | memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); | |
2680 | } else { | |
2681 | WARN_ON(1); | |
2682 | goto out; | |
2683 | } | |
2684 | ||
2685 | /* CSA offsets */ | |
2686 | if (offs) { | |
2687 | int i; | |
2688 | ||
2689 | for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { | |
2690 | u16 csa_off = sdata->csa_counter_offset_beacon[i]; | |
2691 | ||
2692 | if (!csa_off) | |
2693 | continue; | |
2694 | ||
2695 | offs->csa_counter_offs[i] = csa_off_base + csa_off; | |
2696 | } | |
2697 | } | |
2698 | ||
2699 | band = chanctx_conf->def.chan->band; | |
2700 | ||
2701 | info = IEEE80211_SKB_CB(skb); | |
2702 | ||
2703 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; | |
2704 | info->flags |= IEEE80211_TX_CTL_NO_ACK; | |
2705 | info->band = band; | |
2706 | ||
2707 | memset(&txrc, 0, sizeof(txrc)); | |
2708 | txrc.hw = hw; | |
2709 | txrc.sband = local->hw.wiphy->bands[band]; | |
2710 | txrc.bss_conf = &sdata->vif.bss_conf; | |
2711 | txrc.skb = skb; | |
2712 | txrc.reported_rate.idx = -1; | |
2713 | txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; | |
2714 | if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) | |
2715 | txrc.max_rate_idx = -1; | |
2716 | else | |
2717 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; | |
2718 | txrc.bss = true; | |
2719 | rate_control_get_rate(sdata, NULL, &txrc); | |
2720 | ||
2721 | info->control.vif = vif; | |
2722 | ||
2723 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | | |
2724 | IEEE80211_TX_CTL_ASSIGN_SEQ | | |
2725 | IEEE80211_TX_CTL_FIRST_FRAGMENT; | |
2726 | out: | |
2727 | rcu_read_unlock(); | |
2728 | return skb; | |
2729 | ||
2730 | } | |
2731 | ||
2732 | struct sk_buff * | |
2733 | ieee80211_beacon_get_template(struct ieee80211_hw *hw, | |
2734 | struct ieee80211_vif *vif, | |
2735 | struct ieee80211_mutable_offsets *offs) | |
2736 | { | |
2737 | return __ieee80211_beacon_get(hw, vif, offs, true); | |
2738 | } | |
2739 | EXPORT_SYMBOL(ieee80211_beacon_get_template); | |
2740 | ||
2741 | struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, | |
2742 | struct ieee80211_vif *vif, | |
2743 | u16 *tim_offset, u16 *tim_length) | |
2744 | { | |
2745 | struct ieee80211_mutable_offsets offs = {}; | |
2746 | struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); | |
2747 | ||
2748 | if (tim_offset) | |
2749 | *tim_offset = offs.tim_offset; | |
2750 | ||
2751 | if (tim_length) | |
2752 | *tim_length = offs.tim_length; | |
2753 | ||
2754 | return bcn; | |
2755 | } | |
2756 | EXPORT_SYMBOL(ieee80211_beacon_get_tim); | |
2757 | ||
2758 | struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, | |
2759 | struct ieee80211_vif *vif) | |
2760 | { | |
2761 | struct ieee80211_if_ap *ap = NULL; | |
2762 | struct sk_buff *skb = NULL; | |
2763 | struct probe_resp *presp = NULL; | |
2764 | struct ieee80211_hdr *hdr; | |
2765 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
2766 | ||
2767 | if (sdata->vif.type != NL80211_IFTYPE_AP) | |
2768 | return NULL; | |
2769 | ||
2770 | rcu_read_lock(); | |
2771 | ||
2772 | ap = &sdata->u.ap; | |
2773 | presp = rcu_dereference(ap->probe_resp); | |
2774 | if (!presp) | |
2775 | goto out; | |
2776 | ||
2777 | skb = dev_alloc_skb(presp->len); | |
2778 | if (!skb) | |
2779 | goto out; | |
2780 | ||
2781 | memcpy(skb_put(skb, presp->len), presp->data, presp->len); | |
2782 | ||
2783 | hdr = (struct ieee80211_hdr *) skb->data; | |
2784 | memset(hdr->addr1, 0, sizeof(hdr->addr1)); | |
2785 | ||
2786 | out: | |
2787 | rcu_read_unlock(); | |
2788 | return skb; | |
2789 | } | |
2790 | EXPORT_SYMBOL(ieee80211_proberesp_get); | |
2791 | ||
2792 | struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, | |
2793 | struct ieee80211_vif *vif) | |
2794 | { | |
2795 | struct ieee80211_sub_if_data *sdata; | |
2796 | struct ieee80211_if_managed *ifmgd; | |
2797 | struct ieee80211_pspoll *pspoll; | |
2798 | struct ieee80211_local *local; | |
2799 | struct sk_buff *skb; | |
2800 | ||
2801 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2802 | return NULL; | |
2803 | ||
2804 | sdata = vif_to_sdata(vif); | |
2805 | ifmgd = &sdata->u.mgd; | |
2806 | local = sdata->local; | |
2807 | ||
2808 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); | |
2809 | if (!skb) | |
2810 | return NULL; | |
2811 | ||
2812 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2813 | ||
2814 | pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); | |
2815 | memset(pspoll, 0, sizeof(*pspoll)); | |
2816 | pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | | |
2817 | IEEE80211_STYPE_PSPOLL); | |
2818 | pspoll->aid = cpu_to_le16(ifmgd->aid); | |
2819 | ||
2820 | /* aid in PS-Poll has its two MSBs each set to 1 */ | |
2821 | pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); | |
2822 | ||
2823 | memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); | |
2824 | memcpy(pspoll->ta, vif->addr, ETH_ALEN); | |
2825 | ||
2826 | return skb; | |
2827 | } | |
2828 | EXPORT_SYMBOL(ieee80211_pspoll_get); | |
2829 | ||
2830 | struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, | |
2831 | struct ieee80211_vif *vif) | |
2832 | { | |
2833 | struct ieee80211_hdr_3addr *nullfunc; | |
2834 | struct ieee80211_sub_if_data *sdata; | |
2835 | struct ieee80211_if_managed *ifmgd; | |
2836 | struct ieee80211_local *local; | |
2837 | struct sk_buff *skb; | |
2838 | ||
2839 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
2840 | return NULL; | |
2841 | ||
2842 | sdata = vif_to_sdata(vif); | |
2843 | ifmgd = &sdata->u.mgd; | |
2844 | local = sdata->local; | |
2845 | ||
2846 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); | |
2847 | if (!skb) | |
2848 | return NULL; | |
2849 | ||
2850 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2851 | ||
2852 | nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, | |
2853 | sizeof(*nullfunc)); | |
2854 | memset(nullfunc, 0, sizeof(*nullfunc)); | |
2855 | nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
2856 | IEEE80211_STYPE_NULLFUNC | | |
2857 | IEEE80211_FCTL_TODS); | |
2858 | memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); | |
2859 | memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); | |
2860 | memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); | |
2861 | ||
2862 | return skb; | |
2863 | } | |
2864 | EXPORT_SYMBOL(ieee80211_nullfunc_get); | |
2865 | ||
2866 | struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, | |
2867 | struct ieee80211_vif *vif, | |
2868 | const u8 *ssid, size_t ssid_len, | |
2869 | size_t tailroom) | |
2870 | { | |
2871 | struct ieee80211_sub_if_data *sdata; | |
2872 | struct ieee80211_local *local; | |
2873 | struct ieee80211_hdr_3addr *hdr; | |
2874 | struct sk_buff *skb; | |
2875 | size_t ie_ssid_len; | |
2876 | u8 *pos; | |
2877 | ||
2878 | sdata = vif_to_sdata(vif); | |
2879 | local = sdata->local; | |
2880 | ie_ssid_len = 2 + ssid_len; | |
2881 | ||
2882 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + | |
2883 | ie_ssid_len + tailroom); | |
2884 | if (!skb) | |
2885 | return NULL; | |
2886 | ||
2887 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
2888 | ||
2889 | hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); | |
2890 | memset(hdr, 0, sizeof(*hdr)); | |
2891 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
2892 | IEEE80211_STYPE_PROBE_REQ); | |
2893 | eth_broadcast_addr(hdr->addr1); | |
2894 | memcpy(hdr->addr2, vif->addr, ETH_ALEN); | |
2895 | eth_broadcast_addr(hdr->addr3); | |
2896 | ||
2897 | pos = skb_put(skb, ie_ssid_len); | |
2898 | *pos++ = WLAN_EID_SSID; | |
2899 | *pos++ = ssid_len; | |
2900 | if (ssid_len) | |
2901 | memcpy(pos, ssid, ssid_len); | |
2902 | pos += ssid_len; | |
2903 | ||
2904 | return skb; | |
2905 | } | |
2906 | EXPORT_SYMBOL(ieee80211_probereq_get); | |
2907 | ||
2908 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, | |
2909 | const void *frame, size_t frame_len, | |
2910 | const struct ieee80211_tx_info *frame_txctl, | |
2911 | struct ieee80211_rts *rts) | |
2912 | { | |
2913 | const struct ieee80211_hdr *hdr = frame; | |
2914 | ||
2915 | rts->frame_control = | |
2916 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
2917 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, | |
2918 | frame_txctl); | |
2919 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); | |
2920 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); | |
2921 | } | |
2922 | EXPORT_SYMBOL(ieee80211_rts_get); | |
2923 | ||
2924 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, | |
2925 | const void *frame, size_t frame_len, | |
2926 | const struct ieee80211_tx_info *frame_txctl, | |
2927 | struct ieee80211_cts *cts) | |
2928 | { | |
2929 | const struct ieee80211_hdr *hdr = frame; | |
2930 | ||
2931 | cts->frame_control = | |
2932 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); | |
2933 | cts->duration = ieee80211_ctstoself_duration(hw, vif, | |
2934 | frame_len, frame_txctl); | |
2935 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); | |
2936 | } | |
2937 | EXPORT_SYMBOL(ieee80211_ctstoself_get); | |
2938 | ||
2939 | struct sk_buff * | |
2940 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, | |
2941 | struct ieee80211_vif *vif) | |
2942 | { | |
2943 | struct ieee80211_local *local = hw_to_local(hw); | |
2944 | struct sk_buff *skb = NULL; | |
2945 | struct ieee80211_tx_data tx; | |
2946 | struct ieee80211_sub_if_data *sdata; | |
2947 | struct ps_data *ps; | |
2948 | struct ieee80211_tx_info *info; | |
2949 | struct ieee80211_chanctx_conf *chanctx_conf; | |
2950 | ||
2951 | sdata = vif_to_sdata(vif); | |
2952 | ||
2953 | rcu_read_lock(); | |
2954 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); | |
2955 | ||
2956 | if (!chanctx_conf) | |
2957 | goto out; | |
2958 | ||
2959 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
2960 | struct beacon_data *beacon = | |
2961 | rcu_dereference(sdata->u.ap.beacon); | |
2962 | ||
2963 | if (!beacon || !beacon->head) | |
2964 | goto out; | |
2965 | ||
2966 | ps = &sdata->u.ap.ps; | |
2967 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
2968 | ps = &sdata->u.mesh.ps; | |
2969 | } else { | |
2970 | goto out; | |
2971 | } | |
2972 | ||
2973 | if (ps->dtim_count != 0 || !ps->dtim_bc_mc) | |
2974 | goto out; /* send buffered bc/mc only after DTIM beacon */ | |
2975 | ||
2976 | while (1) { | |
2977 | skb = skb_dequeue(&ps->bc_buf); | |
2978 | if (!skb) | |
2979 | goto out; | |
2980 | local->total_ps_buffered--; | |
2981 | ||
2982 | if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { | |
2983 | struct ieee80211_hdr *hdr = | |
2984 | (struct ieee80211_hdr *) skb->data; | |
2985 | /* more buffered multicast/broadcast frames ==> set | |
2986 | * MoreData flag in IEEE 802.11 header to inform PS | |
2987 | * STAs */ | |
2988 | hdr->frame_control |= | |
2989 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
2990 | } | |
2991 | ||
2992 | if (sdata->vif.type == NL80211_IFTYPE_AP) | |
2993 | sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); | |
2994 | if (!ieee80211_tx_prepare(sdata, &tx, skb)) | |
2995 | break; | |
2996 | dev_kfree_skb_any(skb); | |
2997 | } | |
2998 | ||
2999 | info = IEEE80211_SKB_CB(skb); | |
3000 | ||
3001 | tx.flags |= IEEE80211_TX_PS_BUFFERED; | |
3002 | info->band = chanctx_conf->def.chan->band; | |
3003 | ||
3004 | if (invoke_tx_handlers(&tx)) | |
3005 | skb = NULL; | |
3006 | out: | |
3007 | rcu_read_unlock(); | |
3008 | ||
3009 | return skb; | |
3010 | } | |
3011 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); | |
3012 | ||
3013 | void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, | |
3014 | struct sk_buff *skb, int tid, | |
3015 | enum ieee80211_band band) | |
3016 | { | |
3017 | int ac = ieee802_1d_to_ac[tid & 7]; | |
3018 | ||
3019 | skb_set_mac_header(skb, 0); | |
3020 | skb_set_network_header(skb, 0); | |
3021 | skb_set_transport_header(skb, 0); | |
3022 | ||
3023 | skb_set_queue_mapping(skb, ac); | |
3024 | skb->priority = tid; | |
3025 | ||
3026 | skb->dev = sdata->dev; | |
3027 | ||
3028 | /* | |
3029 | * The other path calling ieee80211_xmit is from the tasklet, | |
3030 | * and while we can handle concurrent transmissions locking | |
3031 | * requirements are that we do not come into tx with bhs on. | |
3032 | */ | |
3033 | local_bh_disable(); | |
3034 | ieee80211_xmit(sdata, skb, band); | |
3035 | local_bh_enable(); | |
3036 | } |