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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 <net/net_namespace.h> |
23 | #include <net/ieee80211_radiotap.h> |
24 | #include <net/cfg80211.h> |
25 | #include <net/mac80211.h> |
26 | #include <asm/unaligned.h> |
27 | |
28 | #include "ieee80211_i.h" |
29 | #include "driver-ops.h" |
30 | #include "led.h" |
31 | #include "mesh.h" |
32 | #include "wep.h" |
33 | #include "wpa.h" |
34 | #include "wme.h" |
35 | #include "rate.h" |
36 | |
37 | /* misc utils */ |
38 | |
39 | static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, |
40 | struct sk_buff *skb, int group_addr, |
41 | int next_frag_len) |
42 | { |
43 | int rate, mrate, erp, dur, i; |
44 | struct ieee80211_rate *txrate; |
45 | struct ieee80211_local *local = tx->local; |
46 | struct ieee80211_supported_band *sband; |
47 | struct ieee80211_hdr *hdr; |
48 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
49 | |
50 | /* assume HW handles this */ |
51 | if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) |
52 | return 0; |
53 | |
54 | /* uh huh? */ |
55 | if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) |
56 | return 0; |
57 | |
58 | sband = local->hw.wiphy->bands[info->band]; |
59 | txrate = &sband->bitrates[info->control.rates[0].idx]; |
60 | |
61 | erp = txrate->flags & IEEE80211_RATE_ERP_G; |
62 | |
63 | /* |
64 | * data and mgmt (except PS Poll): |
65 | * - during CFP: 32768 |
66 | * - during contention period: |
67 | * if addr1 is group address: 0 |
68 | * if more fragments = 0 and addr1 is individual address: time to |
69 | * transmit one ACK plus SIFS |
70 | * if more fragments = 1 and addr1 is individual address: time to |
71 | * transmit next fragment plus 2 x ACK plus 3 x SIFS |
72 | * |
73 | * IEEE 802.11, 9.6: |
74 | * - control response frame (CTS or ACK) shall be transmitted using the |
75 | * same rate as the immediately previous frame in the frame exchange |
76 | * sequence, if this rate belongs to the PHY mandatory rates, or else |
77 | * at the highest possible rate belonging to the PHY rates in the |
78 | * BSSBasicRateSet |
79 | */ |
80 | hdr = (struct ieee80211_hdr *)skb->data; |
81 | if (ieee80211_is_ctl(hdr->frame_control)) { |
82 | /* TODO: These control frames are not currently sent by |
83 | * mac80211, but should they be implemented, this function |
84 | * needs to be updated to support duration field calculation. |
85 | * |
86 | * RTS: time needed to transmit pending data/mgmt frame plus |
87 | * one CTS frame plus one ACK frame plus 3 x SIFS |
88 | * CTS: duration of immediately previous RTS minus time |
89 | * required to transmit CTS and its SIFS |
90 | * ACK: 0 if immediately previous directed data/mgmt had |
91 | * more=0, with more=1 duration in ACK frame is duration |
92 | * from previous frame minus time needed to transmit ACK |
93 | * and its SIFS |
94 | * PS Poll: BIT(15) | BIT(14) | aid |
95 | */ |
96 | return 0; |
97 | } |
98 | |
99 | /* data/mgmt */ |
100 | if (0 /* FIX: data/mgmt during CFP */) |
101 | return cpu_to_le16(32768); |
102 | |
103 | if (group_addr) /* Group address as the destination - no ACK */ |
104 | return 0; |
105 | |
106 | /* Individual destination address: |
107 | * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) |
108 | * CTS and ACK frames shall be transmitted using the highest rate in |
109 | * basic rate set that is less than or equal to the rate of the |
110 | * immediately previous frame and that is using the same modulation |
111 | * (CCK or OFDM). If no basic rate set matches with these requirements, |
112 | * the highest mandatory rate of the PHY that is less than or equal to |
113 | * the rate of the previous frame is used. |
114 | * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps |
115 | */ |
116 | rate = -1; |
117 | /* use lowest available if everything fails */ |
118 | mrate = sband->bitrates[0].bitrate; |
119 | for (i = 0; i < sband->n_bitrates; i++) { |
120 | struct ieee80211_rate *r = &sband->bitrates[i]; |
121 | |
122 | if (r->bitrate > txrate->bitrate) |
123 | break; |
124 | |
125 | if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) |
126 | rate = r->bitrate; |
127 | |
128 | switch (sband->band) { |
129 | case IEEE80211_BAND_2GHZ: { |
130 | u32 flag; |
131 | if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) |
132 | flag = IEEE80211_RATE_MANDATORY_G; |
133 | else |
134 | flag = IEEE80211_RATE_MANDATORY_B; |
135 | if (r->flags & flag) |
136 | mrate = r->bitrate; |
137 | break; |
138 | } |
139 | case IEEE80211_BAND_5GHZ: |
140 | if (r->flags & IEEE80211_RATE_MANDATORY_A) |
141 | mrate = r->bitrate; |
142 | break; |
143 | case IEEE80211_BAND_60GHZ: |
144 | /* TODO, for now fall through */ |
145 | case IEEE80211_NUM_BANDS: |
146 | WARN_ON(1); |
147 | break; |
148 | } |
149 | } |
150 | if (rate == -1) { |
151 | /* No matching basic rate found; use highest suitable mandatory |
152 | * PHY rate */ |
153 | rate = mrate; |
154 | } |
155 | |
156 | /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ |
157 | if (ieee80211_is_data_qos(hdr->frame_control) && |
158 | *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) |
159 | dur = 0; |
160 | else |
161 | /* Time needed to transmit ACK |
162 | * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up |
163 | * to closest integer */ |
164 | dur = ieee80211_frame_duration(sband->band, 10, rate, erp, |
165 | tx->sdata->vif.bss_conf.use_short_preamble); |
166 | |
167 | if (next_frag_len) { |
168 | /* Frame is fragmented: duration increases with time needed to |
169 | * transmit next fragment plus ACK and 2 x SIFS. */ |
170 | dur *= 2; /* ACK + SIFS */ |
171 | /* next fragment */ |
172 | dur += ieee80211_frame_duration(sband->band, next_frag_len, |
173 | txrate->bitrate, erp, |
174 | tx->sdata->vif.bss_conf.use_short_preamble); |
175 | } |
176 | |
177 | return cpu_to_le16(dur); |
178 | } |
179 | |
180 | /* tx handlers */ |
181 | static ieee80211_tx_result debug_noinline |
182 | ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) |
183 | { |
184 | struct ieee80211_local *local = tx->local; |
185 | struct ieee80211_if_managed *ifmgd; |
186 | |
187 | /* driver doesn't support power save */ |
188 | if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) |
189 | return TX_CONTINUE; |
190 | |
191 | /* hardware does dynamic power save */ |
192 | if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) |
193 | return TX_CONTINUE; |
194 | |
195 | /* dynamic power save disabled */ |
196 | if (local->hw.conf.dynamic_ps_timeout <= 0) |
197 | return TX_CONTINUE; |
198 | |
199 | /* we are scanning, don't enable power save */ |
200 | if (local->scanning) |
201 | return TX_CONTINUE; |
202 | |
203 | if (!local->ps_sdata) |
204 | return TX_CONTINUE; |
205 | |
206 | /* No point if we're going to suspend */ |
207 | if (local->quiescing) |
208 | return TX_CONTINUE; |
209 | |
210 | /* dynamic ps is supported only in managed mode */ |
211 | if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) |
212 | return TX_CONTINUE; |
213 | |
214 | ifmgd = &tx->sdata->u.mgd; |
215 | |
216 | /* |
217 | * Don't wakeup from power save if u-apsd is enabled, voip ac has |
218 | * u-apsd enabled and the frame is in voip class. This effectively |
219 | * means that even if all access categories have u-apsd enabled, in |
220 | * practise u-apsd is only used with the voip ac. This is a |
221 | * workaround for the case when received voip class packets do not |
222 | * have correct qos tag for some reason, due the network or the |
223 | * peer application. |
224 | * |
225 | * Note: ifmgd->uapsd_queues access is racy here. If the value is |
226 | * changed via debugfs, user needs to reassociate manually to have |
227 | * everything in sync. |
228 | */ |
229 | if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && |
230 | (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && |
231 | skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) |
232 | return TX_CONTINUE; |
233 | |
234 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { |
235 | ieee80211_stop_queues_by_reason(&local->hw, |
236 | IEEE80211_QUEUE_STOP_REASON_PS); |
237 | ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; |
238 | ieee80211_queue_work(&local->hw, |
239 | &local->dynamic_ps_disable_work); |
240 | } |
241 | |
242 | /* Don't restart the timer if we're not disassociated */ |
243 | if (!ifmgd->associated) |
244 | return TX_CONTINUE; |
245 | |
246 | mod_timer(&local->dynamic_ps_timer, jiffies + |
247 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
248 | |
249 | return TX_CONTINUE; |
250 | } |
251 | |
252 | static ieee80211_tx_result debug_noinline |
253 | ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) |
254 | { |
255 | |
256 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
257 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
258 | bool assoc = false; |
259 | |
260 | if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) |
261 | return TX_CONTINUE; |
262 | |
263 | if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && |
264 | test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && |
265 | !ieee80211_is_probe_req(hdr->frame_control) && |
266 | !ieee80211_is_nullfunc(hdr->frame_control)) |
267 | /* |
268 | * When software scanning only nullfunc frames (to notify |
269 | * the sleep state to the AP) and probe requests (for the |
270 | * active scan) are allowed, all other frames should not be |
271 | * sent and we should not get here, but if we do |
272 | * nonetheless, drop them to avoid sending them |
273 | * off-channel. See the link below and |
274 | * ieee80211_start_scan() for more. |
275 | * |
276 | * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 |
277 | */ |
278 | return TX_DROP; |
279 | |
280 | if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) |
281 | return TX_CONTINUE; |
282 | |
283 | if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
284 | return TX_CONTINUE; |
285 | |
286 | if (tx->flags & IEEE80211_TX_PS_BUFFERED) |
287 | return TX_CONTINUE; |
288 | |
289 | if (tx->sta) |
290 | assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); |
291 | |
292 | if (likely(tx->flags & IEEE80211_TX_UNICAST)) { |
293 | if (unlikely(!assoc && |
294 | ieee80211_is_data(hdr->frame_control))) { |
295 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
296 | sdata_info(tx->sdata, |
297 | "dropped data frame to not associated station %pM\n", |
298 | hdr->addr1); |
299 | #endif |
300 | I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); |
301 | return TX_DROP; |
302 | } |
303 | } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && |
304 | ieee80211_is_data(hdr->frame_control) && |
305 | !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { |
306 | /* |
307 | * No associated STAs - no need to send multicast |
308 | * frames. |
309 | */ |
310 | return TX_DROP; |
311 | } |
312 | |
313 | return TX_CONTINUE; |
314 | } |
315 | |
316 | /* This function is called whenever the AP is about to exceed the maximum limit |
317 | * of buffered frames for power saving STAs. This situation should not really |
318 | * happen often during normal operation, so dropping the oldest buffered packet |
319 | * from each queue should be OK to make some room for new frames. */ |
320 | static void purge_old_ps_buffers(struct ieee80211_local *local) |
321 | { |
322 | int total = 0, purged = 0; |
323 | struct sk_buff *skb; |
324 | struct ieee80211_sub_if_data *sdata; |
325 | struct sta_info *sta; |
326 | |
327 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
328 | struct ps_data *ps; |
329 | |
330 | if (sdata->vif.type == NL80211_IFTYPE_AP) |
331 | ps = &sdata->u.ap.ps; |
332 | else if (ieee80211_vif_is_mesh(&sdata->vif)) |
333 | ps = &sdata->u.mesh.ps; |
334 | else |
335 | continue; |
336 | |
337 | skb = skb_dequeue(&ps->bc_buf); |
338 | if (skb) { |
339 | purged++; |
340 | dev_kfree_skb(skb); |
341 | } |
342 | total += skb_queue_len(&ps->bc_buf); |
343 | } |
344 | |
345 | /* |
346 | * Drop one frame from each station from the lowest-priority |
347 | * AC that has frames at all. |
348 | */ |
349 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
350 | int ac; |
351 | |
352 | for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { |
353 | skb = skb_dequeue(&sta->ps_tx_buf[ac]); |
354 | total += skb_queue_len(&sta->ps_tx_buf[ac]); |
355 | if (skb) { |
356 | purged++; |
357 | ieee80211_free_txskb(&local->hw, skb); |
358 | break; |
359 | } |
360 | } |
361 | } |
362 | |
363 | local->total_ps_buffered = total; |
364 | ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); |
365 | } |
366 | |
367 | static ieee80211_tx_result |
368 | ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) |
369 | { |
370 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
371 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
372 | struct ps_data *ps; |
373 | |
374 | /* |
375 | * broadcast/multicast frame |
376 | * |
377 | * If any of the associated/peer stations is in power save mode, |
378 | * the frame is buffered to be sent after DTIM beacon frame. |
379 | * This is done either by the hardware or us. |
380 | */ |
381 | |
382 | /* powersaving STAs currently only in AP/VLAN/mesh mode */ |
383 | if (tx->sdata->vif.type == NL80211_IFTYPE_AP || |
384 | tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
385 | if (!tx->sdata->bss) |
386 | return TX_CONTINUE; |
387 | |
388 | ps = &tx->sdata->bss->ps; |
389 | } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { |
390 | ps = &tx->sdata->u.mesh.ps; |
391 | } else { |
392 | return TX_CONTINUE; |
393 | } |
394 | |
395 | |
396 | /* no buffering for ordered frames */ |
397 | if (ieee80211_has_order(hdr->frame_control)) |
398 | return TX_CONTINUE; |
399 | |
400 | /* no stations in PS mode */ |
401 | if (!atomic_read(&ps->num_sta_ps)) |
402 | return TX_CONTINUE; |
403 | |
404 | info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; |
405 | if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) |
406 | info->hw_queue = tx->sdata->vif.cab_queue; |
407 | |
408 | /* device releases frame after DTIM beacon */ |
409 | if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) |
410 | return TX_CONTINUE; |
411 | |
412 | /* buffered in mac80211 */ |
413 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
414 | purge_old_ps_buffers(tx->local); |
415 | |
416 | if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { |
417 | ps_dbg(tx->sdata, |
418 | "BC TX buffer full - dropping the oldest frame\n"); |
419 | dev_kfree_skb(skb_dequeue(&ps->bc_buf)); |
420 | } else |
421 | tx->local->total_ps_buffered++; |
422 | |
423 | skb_queue_tail(&ps->bc_buf, tx->skb); |
424 | |
425 | return TX_QUEUED; |
426 | } |
427 | |
428 | static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, |
429 | struct sk_buff *skb) |
430 | { |
431 | if (!ieee80211_is_mgmt(fc)) |
432 | return 0; |
433 | |
434 | if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) |
435 | return 0; |
436 | |
437 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) |
438 | skb->data)) |
439 | return 0; |
440 | |
441 | return 1; |
442 | } |
443 | |
444 | static ieee80211_tx_result |
445 | ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) |
446 | { |
447 | struct sta_info *sta = tx->sta; |
448 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
449 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
450 | struct ieee80211_local *local = tx->local; |
451 | |
452 | if (unlikely(!sta)) |
453 | return TX_CONTINUE; |
454 | |
455 | if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || |
456 | test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && |
457 | !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { |
458 | int ac = skb_get_queue_mapping(tx->skb); |
459 | |
460 | /* only deauth, disassoc and action are bufferable MMPDUs */ |
461 | if (ieee80211_is_mgmt(hdr->frame_control) && |
462 | !ieee80211_is_deauth(hdr->frame_control) && |
463 | !ieee80211_is_disassoc(hdr->frame_control) && |
464 | !ieee80211_is_action(hdr->frame_control)) { |
465 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; |
466 | return TX_CONTINUE; |
467 | } |
468 | |
469 | ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", |
470 | sta->sta.addr, sta->sta.aid, ac); |
471 | if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) |
472 | purge_old_ps_buffers(tx->local); |
473 | if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { |
474 | struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); |
475 | ps_dbg(tx->sdata, |
476 | "STA %pM TX buffer for AC %d full - dropping oldest frame\n", |
477 | sta->sta.addr, ac); |
478 | ieee80211_free_txskb(&local->hw, old); |
479 | } else |
480 | tx->local->total_ps_buffered++; |
481 | |
482 | info->control.jiffies = jiffies; |
483 | info->control.vif = &tx->sdata->vif; |
484 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
485 | skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); |
486 | |
487 | if (!timer_pending(&local->sta_cleanup)) |
488 | mod_timer(&local->sta_cleanup, |
489 | round_jiffies(jiffies + |
490 | STA_INFO_CLEANUP_INTERVAL)); |
491 | |
492 | /* |
493 | * We queued up some frames, so the TIM bit might |
494 | * need to be set, recalculate it. |
495 | */ |
496 | sta_info_recalc_tim(sta); |
497 | |
498 | return TX_QUEUED; |
499 | } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { |
500 | ps_dbg(tx->sdata, |
501 | "STA %pM in PS mode, but polling/in SP -> send frame\n", |
502 | sta->sta.addr); |
503 | } |
504 | |
505 | return TX_CONTINUE; |
506 | } |
507 | |
508 | static ieee80211_tx_result debug_noinline |
509 | ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) |
510 | { |
511 | if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) |
512 | return TX_CONTINUE; |
513 | |
514 | if (tx->flags & IEEE80211_TX_UNICAST) |
515 | return ieee80211_tx_h_unicast_ps_buf(tx); |
516 | else |
517 | return ieee80211_tx_h_multicast_ps_buf(tx); |
518 | } |
519 | |
520 | static ieee80211_tx_result debug_noinline |
521 | ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) |
522 | { |
523 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
524 | |
525 | if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && |
526 | tx->sdata->control_port_no_encrypt)) |
527 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
528 | |
529 | return TX_CONTINUE; |
530 | } |
531 | |
532 | static ieee80211_tx_result debug_noinline |
533 | ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) |
534 | { |
535 | struct ieee80211_key *key; |
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(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) |
540 | tx->key = NULL; |
541 | else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) |
542 | tx->key = key; |
543 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
544 | is_multicast_ether_addr(hdr->addr1) && |
545 | ieee80211_is_robust_mgmt_frame(hdr) && |
546 | (key = rcu_dereference(tx->sdata->default_mgmt_key))) |
547 | tx->key = key; |
548 | else if (is_multicast_ether_addr(hdr->addr1) && |
549 | (key = rcu_dereference(tx->sdata->default_multicast_key))) |
550 | tx->key = key; |
551 | else if (!is_multicast_ether_addr(hdr->addr1) && |
552 | (key = rcu_dereference(tx->sdata->default_unicast_key))) |
553 | tx->key = key; |
554 | else if (info->flags & IEEE80211_TX_CTL_INJECTED) |
555 | tx->key = NULL; |
556 | else if (!tx->sdata->drop_unencrypted) |
557 | tx->key = NULL; |
558 | else if (tx->skb->protocol == tx->sdata->control_port_protocol) |
559 | tx->key = NULL; |
560 | else if (ieee80211_is_robust_mgmt_frame(hdr) && |
561 | !(ieee80211_is_action(hdr->frame_control) && |
562 | tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) |
563 | tx->key = NULL; |
564 | else if (ieee80211_is_mgmt(hdr->frame_control) && |
565 | !ieee80211_is_robust_mgmt_frame(hdr)) |
566 | tx->key = NULL; |
567 | else { |
568 | I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); |
569 | return TX_DROP; |
570 | } |
571 | |
572 | if (tx->key) { |
573 | bool skip_hw = false; |
574 | |
575 | tx->key->tx_rx_count++; |
576 | /* TODO: add threshold stuff again */ |
577 | |
578 | switch (tx->key->conf.cipher) { |
579 | case WLAN_CIPHER_SUITE_WEP40: |
580 | case WLAN_CIPHER_SUITE_WEP104: |
581 | case WLAN_CIPHER_SUITE_TKIP: |
582 | if (!ieee80211_is_data_present(hdr->frame_control)) |
583 | tx->key = NULL; |
584 | break; |
585 | case WLAN_CIPHER_SUITE_CCMP: |
586 | if (!ieee80211_is_data_present(hdr->frame_control) && |
587 | !ieee80211_use_mfp(hdr->frame_control, tx->sta, |
588 | tx->skb)) |
589 | tx->key = NULL; |
590 | else |
591 | skip_hw = (tx->key->conf.flags & |
592 | IEEE80211_KEY_FLAG_SW_MGMT_TX) && |
593 | ieee80211_is_mgmt(hdr->frame_control); |
594 | break; |
595 | case WLAN_CIPHER_SUITE_AES_CMAC: |
596 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
597 | tx->key = NULL; |
598 | break; |
599 | } |
600 | |
601 | if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && |
602 | !ieee80211_is_deauth(hdr->frame_control))) |
603 | return TX_DROP; |
604 | |
605 | if (!skip_hw && tx->key && |
606 | tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
607 | info->control.hw_key = &tx->key->conf; |
608 | } |
609 | |
610 | return TX_CONTINUE; |
611 | } |
612 | |
613 | static ieee80211_tx_result debug_noinline |
614 | ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) |
615 | { |
616 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
617 | struct ieee80211_hdr *hdr = (void *)tx->skb->data; |
618 | struct ieee80211_supported_band *sband; |
619 | struct ieee80211_rate *rate; |
620 | int i; |
621 | u32 len; |
622 | bool inval = false, rts = false, short_preamble = false; |
623 | struct ieee80211_tx_rate_control txrc; |
624 | bool assoc = false; |
625 | |
626 | memset(&txrc, 0, sizeof(txrc)); |
627 | |
628 | sband = tx->local->hw.wiphy->bands[info->band]; |
629 | |
630 | len = min_t(u32, tx->skb->len + FCS_LEN, |
631 | tx->local->hw.wiphy->frag_threshold); |
632 | |
633 | /* set up the tx rate control struct we give the RC algo */ |
634 | txrc.hw = &tx->local->hw; |
635 | txrc.sband = sband; |
636 | txrc.bss_conf = &tx->sdata->vif.bss_conf; |
637 | txrc.skb = tx->skb; |
638 | txrc.reported_rate.idx = -1; |
639 | txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; |
640 | if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) |
641 | txrc.max_rate_idx = -1; |
642 | else |
643 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; |
644 | memcpy(txrc.rate_idx_mcs_mask, |
645 | tx->sdata->rc_rateidx_mcs_mask[info->band], |
646 | sizeof(txrc.rate_idx_mcs_mask)); |
647 | txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || |
648 | tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || |
649 | tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); |
650 | |
651 | /* set up RTS protection if desired */ |
652 | if (len > tx->local->hw.wiphy->rts_threshold) { |
653 | txrc.rts = rts = true; |
654 | } |
655 | |
656 | /* |
657 | * Use short preamble if the BSS can handle it, but not for |
658 | * management frames unless we know the receiver can handle |
659 | * that -- the management frame might be to a station that |
660 | * just wants a probe response. |
661 | */ |
662 | if (tx->sdata->vif.bss_conf.use_short_preamble && |
663 | (ieee80211_is_data(hdr->frame_control) || |
664 | (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) |
665 | txrc.short_preamble = short_preamble = true; |
666 | |
667 | if (tx->sta) |
668 | assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); |
669 | |
670 | /* |
671 | * Lets not bother rate control if we're associated and cannot |
672 | * talk to the sta. This should not happen. |
673 | */ |
674 | if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && |
675 | !rate_usable_index_exists(sband, &tx->sta->sta), |
676 | "%s: Dropped data frame as no usable bitrate found while " |
677 | "scanning and associated. Target station: " |
678 | "%pM on %d GHz band\n", |
679 | tx->sdata->name, hdr->addr1, |
680 | info->band ? 5 : 2)) |
681 | return TX_DROP; |
682 | |
683 | /* |
684 | * If we're associated with the sta at this point we know we can at |
685 | * least send the frame at the lowest bit rate. |
686 | */ |
687 | rate_control_get_rate(tx->sdata, tx->sta, &txrc); |
688 | |
689 | if (unlikely(info->control.rates[0].idx < 0)) |
690 | return TX_DROP; |
691 | |
692 | if (txrc.reported_rate.idx < 0) { |
693 | txrc.reported_rate = info->control.rates[0]; |
694 | if (tx->sta && ieee80211_is_data(hdr->frame_control)) |
695 | tx->sta->last_tx_rate = txrc.reported_rate; |
696 | } else if (tx->sta) |
697 | tx->sta->last_tx_rate = txrc.reported_rate; |
698 | |
699 | if (unlikely(!info->control.rates[0].count)) |
700 | info->control.rates[0].count = 1; |
701 | |
702 | if (WARN_ON_ONCE((info->control.rates[0].count > 1) && |
703 | (info->flags & IEEE80211_TX_CTL_NO_ACK))) |
704 | info->control.rates[0].count = 1; |
705 | |
706 | if (is_multicast_ether_addr(hdr->addr1)) { |
707 | /* |
708 | * XXX: verify the rate is in the basic rateset |
709 | */ |
710 | return TX_CONTINUE; |
711 | } |
712 | |
713 | /* |
714 | * set up the RTS/CTS rate as the fastest basic rate |
715 | * that is not faster than the data rate |
716 | * |
717 | * XXX: Should this check all retry rates? |
718 | */ |
719 | if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { |
720 | s8 baserate = 0; |
721 | |
722 | rate = &sband->bitrates[info->control.rates[0].idx]; |
723 | |
724 | for (i = 0; i < sband->n_bitrates; i++) { |
725 | /* must be a basic rate */ |
726 | if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) |
727 | continue; |
728 | /* must not be faster than the data rate */ |
729 | if (sband->bitrates[i].bitrate > rate->bitrate) |
730 | continue; |
731 | /* maximum */ |
732 | if (sband->bitrates[baserate].bitrate < |
733 | sband->bitrates[i].bitrate) |
734 | baserate = i; |
735 | } |
736 | |
737 | info->control.rts_cts_rate_idx = baserate; |
738 | } |
739 | |
740 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
741 | /* |
742 | * make sure there's no valid rate following |
743 | * an invalid one, just in case drivers don't |
744 | * take the API seriously to stop at -1. |
745 | */ |
746 | if (inval) { |
747 | info->control.rates[i].idx = -1; |
748 | continue; |
749 | } |
750 | if (info->control.rates[i].idx < 0) { |
751 | inval = true; |
752 | continue; |
753 | } |
754 | |
755 | /* |
756 | * For now assume MCS is already set up correctly, this |
757 | * needs to be fixed. |
758 | */ |
759 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { |
760 | WARN_ON(info->control.rates[i].idx > 76); |
761 | continue; |
762 | } |
763 | |
764 | /* set up RTS protection if desired */ |
765 | if (rts) |
766 | info->control.rates[i].flags |= |
767 | IEEE80211_TX_RC_USE_RTS_CTS; |
768 | |
769 | /* RC is busted */ |
770 | if (WARN_ON_ONCE(info->control.rates[i].idx >= |
771 | sband->n_bitrates)) { |
772 | info->control.rates[i].idx = -1; |
773 | continue; |
774 | } |
775 | |
776 | rate = &sband->bitrates[info->control.rates[i].idx]; |
777 | |
778 | /* set up short preamble */ |
779 | if (short_preamble && |
780 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) |
781 | info->control.rates[i].flags |= |
782 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE; |
783 | |
784 | /* set up G protection */ |
785 | if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && |
786 | rate->flags & IEEE80211_RATE_ERP_G) |
787 | info->control.rates[i].flags |= |
788 | IEEE80211_TX_RC_USE_CTS_PROTECT; |
789 | } |
790 | |
791 | return TX_CONTINUE; |
792 | } |
793 | |
794 | static ieee80211_tx_result debug_noinline |
795 | ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) |
796 | { |
797 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
798 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; |
799 | u16 *seq; |
800 | u8 *qc; |
801 | int tid; |
802 | |
803 | /* |
804 | * Packet injection may want to control the sequence |
805 | * number, if we have no matching interface then we |
806 | * neither assign one ourselves nor ask the driver to. |
807 | */ |
808 | if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) |
809 | return TX_CONTINUE; |
810 | |
811 | if (unlikely(ieee80211_is_ctl(hdr->frame_control))) |
812 | return TX_CONTINUE; |
813 | |
814 | if (ieee80211_hdrlen(hdr->frame_control) < 24) |
815 | return TX_CONTINUE; |
816 | |
817 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) |
818 | return TX_CONTINUE; |
819 | |
820 | /* |
821 | * Anything but QoS data that has a sequence number field |
822 | * (is long enough) gets a sequence number from the global |
823 | * counter. |
824 | */ |
825 | if (!ieee80211_is_data_qos(hdr->frame_control)) { |
826 | /* driver should assign sequence number */ |
827 | info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; |
828 | /* for pure STA mode without beacons, we can do it */ |
829 | hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); |
830 | tx->sdata->sequence_number += 0x10; |
831 | return TX_CONTINUE; |
832 | } |
833 | |
834 | /* |
835 | * This should be true for injected/management frames only, for |
836 | * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ |
837 | * above since they are not QoS-data frames. |
838 | */ |
839 | if (!tx->sta) |
840 | return TX_CONTINUE; |
841 | |
842 | /* include per-STA, per-TID sequence counter */ |
843 | |
844 | qc = ieee80211_get_qos_ctl(hdr); |
845 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
846 | seq = &tx->sta->tid_seq[tid]; |
847 | |
848 | hdr->seq_ctrl = cpu_to_le16(*seq); |
849 | |
850 | /* Increase the sequence number. */ |
851 | *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; |
852 | |
853 | return TX_CONTINUE; |
854 | } |
855 | |
856 | static int ieee80211_fragment(struct ieee80211_tx_data *tx, |
857 | struct sk_buff *skb, int hdrlen, |
858 | int frag_threshold) |
859 | { |
860 | struct ieee80211_local *local = tx->local; |
861 | struct ieee80211_tx_info *info; |
862 | struct sk_buff *tmp; |
863 | int per_fragm = frag_threshold - hdrlen - FCS_LEN; |
864 | int pos = hdrlen + per_fragm; |
865 | int rem = skb->len - hdrlen - per_fragm; |
866 | |
867 | if (WARN_ON(rem < 0)) |
868 | return -EINVAL; |
869 | |
870 | /* first fragment was already added to queue by caller */ |
871 | |
872 | while (rem) { |
873 | int fraglen = per_fragm; |
874 | |
875 | if (fraglen > rem) |
876 | fraglen = rem; |
877 | rem -= fraglen; |
878 | tmp = dev_alloc_skb(local->tx_headroom + |
879 | frag_threshold + |
880 | IEEE80211_ENCRYPT_HEADROOM + |
881 | IEEE80211_ENCRYPT_TAILROOM); |
882 | if (!tmp) |
883 | return -ENOMEM; |
884 | |
885 | __skb_queue_tail(&tx->skbs, tmp); |
886 | |
887 | skb_reserve(tmp, local->tx_headroom + |
888 | IEEE80211_ENCRYPT_HEADROOM); |
889 | /* copy control information */ |
890 | memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); |
891 | |
892 | info = IEEE80211_SKB_CB(tmp); |
893 | info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | |
894 | IEEE80211_TX_CTL_FIRST_FRAGMENT); |
895 | |
896 | if (rem) |
897 | info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; |
898 | |
899 | skb_copy_queue_mapping(tmp, skb); |
900 | tmp->priority = skb->priority; |
901 | tmp->dev = skb->dev; |
902 | |
903 | /* copy header and data */ |
904 | memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); |
905 | memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); |
906 | |
907 | pos += fraglen; |
908 | } |
909 | |
910 | /* adjust first fragment's length */ |
911 | skb->len = hdrlen + per_fragm; |
912 | return 0; |
913 | } |
914 | |
915 | static ieee80211_tx_result debug_noinline |
916 | ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) |
917 | { |
918 | struct sk_buff *skb = tx->skb; |
919 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
920 | struct ieee80211_hdr *hdr = (void *)skb->data; |
921 | int frag_threshold = tx->local->hw.wiphy->frag_threshold; |
922 | int hdrlen; |
923 | int fragnum; |
924 | |
925 | /* no matter what happens, tx->skb moves to tx->skbs */ |
926 | __skb_queue_tail(&tx->skbs, skb); |
927 | tx->skb = NULL; |
928 | |
929 | if (info->flags & IEEE80211_TX_CTL_DONTFRAG) |
930 | return TX_CONTINUE; |
931 | |
932 | if (tx->local->ops->set_frag_threshold) |
933 | return TX_CONTINUE; |
934 | |
935 | /* |
936 | * Warn when submitting a fragmented A-MPDU frame and drop it. |
937 | * This scenario is handled in ieee80211_tx_prepare but extra |
938 | * caution taken here as fragmented ampdu may cause Tx stop. |
939 | */ |
940 | if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) |
941 | return TX_DROP; |
942 | |
943 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
944 | |
945 | /* internal error, why isn't DONTFRAG set? */ |
946 | if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) |
947 | return TX_DROP; |
948 | |
949 | /* |
950 | * Now fragment the frame. This will allocate all the fragments and |
951 | * chain them (using skb as the first fragment) to skb->next. |
952 | * During transmission, we will remove the successfully transmitted |
953 | * fragments from this list. When the low-level driver rejects one |
954 | * of the fragments then we will simply pretend to accept the skb |
955 | * but store it away as pending. |
956 | */ |
957 | if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) |
958 | return TX_DROP; |
959 | |
960 | /* update duration/seq/flags of fragments */ |
961 | fragnum = 0; |
962 | |
963 | skb_queue_walk(&tx->skbs, skb) { |
964 | const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); |
965 | |
966 | hdr = (void *)skb->data; |
967 | info = IEEE80211_SKB_CB(skb); |
968 | |
969 | if (!skb_queue_is_last(&tx->skbs, skb)) { |
970 | hdr->frame_control |= morefrags; |
971 | /* |
972 | * No multi-rate retries for fragmented frames, that |
973 | * would completely throw off the NAV at other STAs. |
974 | */ |
975 | info->control.rates[1].idx = -1; |
976 | info->control.rates[2].idx = -1; |
977 | info->control.rates[3].idx = -1; |
978 | BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); |
979 | info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
980 | } else { |
981 | hdr->frame_control &= ~morefrags; |
982 | } |
983 | hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); |
984 | fragnum++; |
985 | } |
986 | |
987 | return TX_CONTINUE; |
988 | } |
989 | |
990 | static ieee80211_tx_result debug_noinline |
991 | ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) |
992 | { |
993 | struct sk_buff *skb; |
994 | |
995 | if (!tx->sta) |
996 | return TX_CONTINUE; |
997 | |
998 | tx->sta->tx_packets++; |
999 | skb_queue_walk(&tx->skbs, skb) { |
1000 | tx->sta->tx_fragments++; |
1001 | tx->sta->tx_bytes += skb->len; |
1002 | } |
1003 | |
1004 | return TX_CONTINUE; |
1005 | } |
1006 | |
1007 | static ieee80211_tx_result debug_noinline |
1008 | ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) |
1009 | { |
1010 | if (!tx->key) |
1011 | return TX_CONTINUE; |
1012 | |
1013 | switch (tx->key->conf.cipher) { |
1014 | case WLAN_CIPHER_SUITE_WEP40: |
1015 | case WLAN_CIPHER_SUITE_WEP104: |
1016 | return ieee80211_crypto_wep_encrypt(tx); |
1017 | case WLAN_CIPHER_SUITE_TKIP: |
1018 | return ieee80211_crypto_tkip_encrypt(tx); |
1019 | case WLAN_CIPHER_SUITE_CCMP: |
1020 | return ieee80211_crypto_ccmp_encrypt(tx); |
1021 | case WLAN_CIPHER_SUITE_AES_CMAC: |
1022 | return ieee80211_crypto_aes_cmac_encrypt(tx); |
1023 | default: |
1024 | return ieee80211_crypto_hw_encrypt(tx); |
1025 | } |
1026 | |
1027 | return TX_DROP; |
1028 | } |
1029 | |
1030 | static ieee80211_tx_result debug_noinline |
1031 | ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) |
1032 | { |
1033 | struct sk_buff *skb; |
1034 | struct ieee80211_hdr *hdr; |
1035 | int next_len; |
1036 | bool group_addr; |
1037 | |
1038 | skb_queue_walk(&tx->skbs, skb) { |
1039 | hdr = (void *) skb->data; |
1040 | if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) |
1041 | break; /* must not overwrite AID */ |
1042 | if (!skb_queue_is_last(&tx->skbs, skb)) { |
1043 | struct sk_buff *next = skb_queue_next(&tx->skbs, skb); |
1044 | next_len = next->len; |
1045 | } else |
1046 | next_len = 0; |
1047 | group_addr = is_multicast_ether_addr(hdr->addr1); |
1048 | |
1049 | hdr->duration_id = |
1050 | ieee80211_duration(tx, skb, group_addr, next_len); |
1051 | } |
1052 | |
1053 | return TX_CONTINUE; |
1054 | } |
1055 | |
1056 | /* actual transmit path */ |
1057 | |
1058 | static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, |
1059 | struct sk_buff *skb, |
1060 | struct ieee80211_tx_info *info, |
1061 | struct tid_ampdu_tx *tid_tx, |
1062 | int tid) |
1063 | { |
1064 | bool queued = false; |
1065 | bool reset_agg_timer = false; |
1066 | struct sk_buff *purge_skb = NULL; |
1067 | |
1068 | if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { |
1069 | info->flags |= IEEE80211_TX_CTL_AMPDU; |
1070 | reset_agg_timer = true; |
1071 | } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
1072 | /* |
1073 | * nothing -- this aggregation session is being started |
1074 | * but that might still fail with the driver |
1075 | */ |
1076 | } else { |
1077 | spin_lock(&tx->sta->lock); |
1078 | /* |
1079 | * Need to re-check now, because we may get here |
1080 | * |
1081 | * 1) in the window during which the setup is actually |
1082 | * already done, but not marked yet because not all |
1083 | * packets are spliced over to the driver pending |
1084 | * queue yet -- if this happened we acquire the lock |
1085 | * either before or after the splice happens, but |
1086 | * need to recheck which of these cases happened. |
1087 | * |
1088 | * 2) during session teardown, if the OPERATIONAL bit |
1089 | * was cleared due to the teardown but the pointer |
1090 | * hasn't been assigned NULL yet (or we loaded it |
1091 | * before it was assigned) -- in this case it may |
1092 | * now be NULL which means we should just let the |
1093 | * packet pass through because splicing the frames |
1094 | * back is already done. |
1095 | */ |
1096 | tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); |
1097 | |
1098 | if (!tid_tx) { |
1099 | /* do nothing, let packet pass through */ |
1100 | } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { |
1101 | info->flags |= IEEE80211_TX_CTL_AMPDU; |
1102 | reset_agg_timer = true; |
1103 | } else { |
1104 | queued = true; |
1105 | info->control.vif = &tx->sdata->vif; |
1106 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
1107 | __skb_queue_tail(&tid_tx->pending, skb); |
1108 | if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) |
1109 | purge_skb = __skb_dequeue(&tid_tx->pending); |
1110 | } |
1111 | spin_unlock(&tx->sta->lock); |
1112 | |
1113 | if (purge_skb) |
1114 | ieee80211_free_txskb(&tx->local->hw, purge_skb); |
1115 | } |
1116 | |
1117 | /* reset session timer */ |
1118 | if (reset_agg_timer && tid_tx->timeout) |
1119 | tid_tx->last_tx = jiffies; |
1120 | |
1121 | return queued; |
1122 | } |
1123 | |
1124 | /* |
1125 | * initialises @tx |
1126 | */ |
1127 | static ieee80211_tx_result |
1128 | ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, |
1129 | struct ieee80211_tx_data *tx, |
1130 | struct sk_buff *skb) |
1131 | { |
1132 | struct ieee80211_local *local = sdata->local; |
1133 | struct ieee80211_hdr *hdr; |
1134 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1135 | int tid; |
1136 | u8 *qc; |
1137 | |
1138 | memset(tx, 0, sizeof(*tx)); |
1139 | tx->skb = skb; |
1140 | tx->local = local; |
1141 | tx->sdata = sdata; |
1142 | __skb_queue_head_init(&tx->skbs); |
1143 | |
1144 | /* |
1145 | * If this flag is set to true anywhere, and we get here, |
1146 | * we are doing the needed processing, so remove the flag |
1147 | * now. |
1148 | */ |
1149 | info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
1150 | |
1151 | hdr = (struct ieee80211_hdr *) skb->data; |
1152 | |
1153 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
1154 | tx->sta = rcu_dereference(sdata->u.vlan.sta); |
1155 | if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) |
1156 | return TX_DROP; |
1157 | } else if (info->flags & IEEE80211_TX_CTL_INJECTED || |
1158 | tx->sdata->control_port_protocol == tx->skb->protocol) { |
1159 | tx->sta = sta_info_get_bss(sdata, hdr->addr1); |
1160 | } |
1161 | if (!tx->sta) |
1162 | tx->sta = sta_info_get(sdata, hdr->addr1); |
1163 | |
1164 | if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && |
1165 | !ieee80211_is_qos_nullfunc(hdr->frame_control) && |
1166 | (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && |
1167 | !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { |
1168 | struct tid_ampdu_tx *tid_tx; |
1169 | |
1170 | qc = ieee80211_get_qos_ctl(hdr); |
1171 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
1172 | |
1173 | tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); |
1174 | if (tid_tx) { |
1175 | bool queued; |
1176 | |
1177 | queued = ieee80211_tx_prep_agg(tx, skb, info, |
1178 | tid_tx, tid); |
1179 | |
1180 | if (unlikely(queued)) |
1181 | return TX_QUEUED; |
1182 | } |
1183 | } |
1184 | |
1185 | if (is_multicast_ether_addr(hdr->addr1)) { |
1186 | tx->flags &= ~IEEE80211_TX_UNICAST; |
1187 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
1188 | } else |
1189 | tx->flags |= IEEE80211_TX_UNICAST; |
1190 | |
1191 | if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { |
1192 | if (!(tx->flags & IEEE80211_TX_UNICAST) || |
1193 | skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || |
1194 | info->flags & IEEE80211_TX_CTL_AMPDU) |
1195 | info->flags |= IEEE80211_TX_CTL_DONTFRAG; |
1196 | } |
1197 | |
1198 | if (!tx->sta) |
1199 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1200 | else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) |
1201 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; |
1202 | |
1203 | info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; |
1204 | |
1205 | return TX_CONTINUE; |
1206 | } |
1207 | |
1208 | static bool ieee80211_tx_frags(struct ieee80211_local *local, |
1209 | struct ieee80211_vif *vif, |
1210 | struct ieee80211_sta *sta, |
1211 | struct sk_buff_head *skbs, |
1212 | bool txpending) |
1213 | { |
1214 | struct ieee80211_tx_control control; |
1215 | struct sk_buff *skb, *tmp; |
1216 | unsigned long flags; |
1217 | |
1218 | skb_queue_walk_safe(skbs, skb, tmp) { |
1219 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1220 | int q = info->hw_queue; |
1221 | |
1222 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1223 | if (WARN_ON_ONCE(q >= local->hw.queues)) { |
1224 | __skb_unlink(skb, skbs); |
1225 | ieee80211_free_txskb(&local->hw, skb); |
1226 | continue; |
1227 | } |
1228 | #endif |
1229 | |
1230 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
1231 | if (local->queue_stop_reasons[q] || |
1232 | (!txpending && !skb_queue_empty(&local->pending[q]))) { |
1233 | if (unlikely(info->flags & |
1234 | IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { |
1235 | if (local->queue_stop_reasons[q] & |
1236 | ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { |
1237 | /* |
1238 | * Drop off-channel frames if queues |
1239 | * are stopped for any reason other |
1240 | * than off-channel operation. Never |
1241 | * queue them. |
1242 | */ |
1243 | spin_unlock_irqrestore( |
1244 | &local->queue_stop_reason_lock, |
1245 | flags); |
1246 | ieee80211_purge_tx_queue(&local->hw, |
1247 | skbs); |
1248 | return true; |
1249 | } |
1250 | } else { |
1251 | |
1252 | /* |
1253 | * Since queue is stopped, queue up frames for |
1254 | * later transmission from the tx-pending |
1255 | * tasklet when the queue is woken again. |
1256 | */ |
1257 | if (txpending) |
1258 | skb_queue_splice_init(skbs, |
1259 | &local->pending[q]); |
1260 | else |
1261 | skb_queue_splice_tail_init(skbs, |
1262 | &local->pending[q]); |
1263 | |
1264 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
1265 | flags); |
1266 | return false; |
1267 | } |
1268 | } |
1269 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
1270 | |
1271 | info->control.vif = vif; |
1272 | control.sta = sta; |
1273 | |
1274 | __skb_unlink(skb, skbs); |
1275 | drv_tx(local, &control, skb); |
1276 | } |
1277 | |
1278 | return true; |
1279 | } |
1280 | |
1281 | /* |
1282 | * Returns false if the frame couldn't be transmitted but was queued instead. |
1283 | */ |
1284 | static bool __ieee80211_tx(struct ieee80211_local *local, |
1285 | struct sk_buff_head *skbs, int led_len, |
1286 | struct sta_info *sta, bool txpending) |
1287 | { |
1288 | struct ieee80211_tx_info *info; |
1289 | struct ieee80211_sub_if_data *sdata; |
1290 | struct ieee80211_vif *vif; |
1291 | struct ieee80211_sta *pubsta; |
1292 | struct sk_buff *skb; |
1293 | bool result = true; |
1294 | __le16 fc; |
1295 | |
1296 | if (WARN_ON(skb_queue_empty(skbs))) |
1297 | return true; |
1298 | |
1299 | skb = skb_peek(skbs); |
1300 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
1301 | info = IEEE80211_SKB_CB(skb); |
1302 | sdata = vif_to_sdata(info->control.vif); |
1303 | if (sta && !sta->uploaded) |
1304 | sta = NULL; |
1305 | |
1306 | if (sta) |
1307 | pubsta = &sta->sta; |
1308 | else |
1309 | pubsta = NULL; |
1310 | |
1311 | switch (sdata->vif.type) { |
1312 | case NL80211_IFTYPE_MONITOR: |
1313 | sdata = rcu_dereference(local->monitor_sdata); |
1314 | if (sdata) { |
1315 | vif = &sdata->vif; |
1316 | info->hw_queue = |
1317 | vif->hw_queue[skb_get_queue_mapping(skb)]; |
1318 | } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { |
1319 | dev_kfree_skb(skb); |
1320 | return true; |
1321 | } else |
1322 | vif = NULL; |
1323 | break; |
1324 | case NL80211_IFTYPE_AP_VLAN: |
1325 | sdata = container_of(sdata->bss, |
1326 | struct ieee80211_sub_if_data, u.ap); |
1327 | /* fall through */ |
1328 | default: |
1329 | vif = &sdata->vif; |
1330 | break; |
1331 | } |
1332 | |
1333 | result = ieee80211_tx_frags(local, vif, pubsta, skbs, |
1334 | txpending); |
1335 | |
1336 | ieee80211_tpt_led_trig_tx(local, fc, led_len); |
1337 | ieee80211_led_tx(local, 1); |
1338 | |
1339 | WARN_ON_ONCE(!skb_queue_empty(skbs)); |
1340 | |
1341 | return result; |
1342 | } |
1343 | |
1344 | /* |
1345 | * Invoke TX handlers, return 0 on success and non-zero if the |
1346 | * frame was dropped or queued. |
1347 | */ |
1348 | static int invoke_tx_handlers(struct ieee80211_tx_data *tx) |
1349 | { |
1350 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); |
1351 | ieee80211_tx_result res = TX_DROP; |
1352 | |
1353 | #define CALL_TXH(txh) \ |
1354 | do { \ |
1355 | res = txh(tx); \ |
1356 | if (res != TX_CONTINUE) \ |
1357 | goto txh_done; \ |
1358 | } while (0) |
1359 | |
1360 | CALL_TXH(ieee80211_tx_h_dynamic_ps); |
1361 | CALL_TXH(ieee80211_tx_h_check_assoc); |
1362 | CALL_TXH(ieee80211_tx_h_ps_buf); |
1363 | CALL_TXH(ieee80211_tx_h_check_control_port_protocol); |
1364 | CALL_TXH(ieee80211_tx_h_select_key); |
1365 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) |
1366 | CALL_TXH(ieee80211_tx_h_rate_ctrl); |
1367 | |
1368 | if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { |
1369 | __skb_queue_tail(&tx->skbs, tx->skb); |
1370 | tx->skb = NULL; |
1371 | goto txh_done; |
1372 | } |
1373 | |
1374 | CALL_TXH(ieee80211_tx_h_michael_mic_add); |
1375 | CALL_TXH(ieee80211_tx_h_sequence); |
1376 | CALL_TXH(ieee80211_tx_h_fragment); |
1377 | /* handlers after fragment must be aware of tx info fragmentation! */ |
1378 | CALL_TXH(ieee80211_tx_h_stats); |
1379 | CALL_TXH(ieee80211_tx_h_encrypt); |
1380 | if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) |
1381 | CALL_TXH(ieee80211_tx_h_calculate_duration); |
1382 | #undef CALL_TXH |
1383 | |
1384 | txh_done: |
1385 | if (unlikely(res == TX_DROP)) { |
1386 | I802_DEBUG_INC(tx->local->tx_handlers_drop); |
1387 | if (tx->skb) |
1388 | ieee80211_free_txskb(&tx->local->hw, tx->skb); |
1389 | else |
1390 | ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); |
1391 | return -1; |
1392 | } else if (unlikely(res == TX_QUEUED)) { |
1393 | I802_DEBUG_INC(tx->local->tx_handlers_queued); |
1394 | return -1; |
1395 | } |
1396 | |
1397 | return 0; |
1398 | } |
1399 | |
1400 | /* |
1401 | * Returns false if the frame couldn't be transmitted but was queued instead. |
1402 | */ |
1403 | static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, |
1404 | struct sk_buff *skb, bool txpending, |
1405 | enum ieee80211_band band) |
1406 | { |
1407 | struct ieee80211_local *local = sdata->local; |
1408 | struct ieee80211_tx_data tx; |
1409 | ieee80211_tx_result res_prepare; |
1410 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1411 | bool result = true; |
1412 | int led_len; |
1413 | |
1414 | if (unlikely(skb->len < 10)) { |
1415 | dev_kfree_skb(skb); |
1416 | return true; |
1417 | } |
1418 | |
1419 | /* initialises tx */ |
1420 | led_len = skb->len; |
1421 | res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); |
1422 | |
1423 | if (unlikely(res_prepare == TX_DROP)) { |
1424 | ieee80211_free_txskb(&local->hw, skb); |
1425 | return true; |
1426 | } else if (unlikely(res_prepare == TX_QUEUED)) { |
1427 | return true; |
1428 | } |
1429 | |
1430 | info->band = band; |
1431 | |
1432 | /* set up hw_queue value early */ |
1433 | if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || |
1434 | !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) |
1435 | info->hw_queue = |
1436 | sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; |
1437 | |
1438 | if (!invoke_tx_handlers(&tx)) |
1439 | result = __ieee80211_tx(local, &tx.skbs, led_len, |
1440 | tx.sta, txpending); |
1441 | |
1442 | return result; |
1443 | } |
1444 | |
1445 | /* device xmit handlers */ |
1446 | |
1447 | static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, |
1448 | struct sk_buff *skb, |
1449 | int head_need, bool may_encrypt) |
1450 | { |
1451 | struct ieee80211_local *local = sdata->local; |
1452 | int tail_need = 0; |
1453 | |
1454 | if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { |
1455 | tail_need = IEEE80211_ENCRYPT_TAILROOM; |
1456 | tail_need -= skb_tailroom(skb); |
1457 | tail_need = max_t(int, tail_need, 0); |
1458 | } |
1459 | |
1460 | if (skb_cloned(skb)) |
1461 | I802_DEBUG_INC(local->tx_expand_skb_head_cloned); |
1462 | else if (head_need || tail_need) |
1463 | I802_DEBUG_INC(local->tx_expand_skb_head); |
1464 | else |
1465 | return 0; |
1466 | |
1467 | if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { |
1468 | wiphy_debug(local->hw.wiphy, |
1469 | "failed to reallocate TX buffer\n"); |
1470 | return -ENOMEM; |
1471 | } |
1472 | |
1473 | return 0; |
1474 | } |
1475 | |
1476 | void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, |
1477 | enum ieee80211_band band) |
1478 | { |
1479 | struct ieee80211_local *local = sdata->local; |
1480 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1481 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
1482 | int headroom; |
1483 | bool may_encrypt; |
1484 | |
1485 | may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); |
1486 | |
1487 | headroom = local->tx_headroom; |
1488 | if (may_encrypt) |
1489 | headroom += IEEE80211_ENCRYPT_HEADROOM; |
1490 | headroom -= skb_headroom(skb); |
1491 | headroom = max_t(int, 0, headroom); |
1492 | |
1493 | if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { |
1494 | ieee80211_free_txskb(&local->hw, skb); |
1495 | return; |
1496 | } |
1497 | |
1498 | hdr = (struct ieee80211_hdr *) skb->data; |
1499 | info->control.vif = &sdata->vif; |
1500 | |
1501 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1502 | if (ieee80211_is_data(hdr->frame_control) && |
1503 | is_unicast_ether_addr(hdr->addr1)) { |
1504 | if (mesh_nexthop_resolve(sdata, skb)) |
1505 | return; /* skb queued: don't free */ |
1506 | } else { |
1507 | ieee80211_mps_set_frame_flags(sdata, NULL, hdr); |
1508 | } |
1509 | } |
1510 | |
1511 | ieee80211_set_qos_hdr(sdata, skb); |
1512 | ieee80211_tx(sdata, skb, false, band); |
1513 | } |
1514 | |
1515 | static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) |
1516 | { |
1517 | struct ieee80211_radiotap_iterator iterator; |
1518 | struct ieee80211_radiotap_header *rthdr = |
1519 | (struct ieee80211_radiotap_header *) skb->data; |
1520 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1521 | int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, |
1522 | NULL); |
1523 | u16 txflags; |
1524 | |
1525 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
1526 | IEEE80211_TX_CTL_DONTFRAG; |
1527 | |
1528 | /* |
1529 | * for every radiotap entry that is present |
1530 | * (ieee80211_radiotap_iterator_next returns -ENOENT when no more |
1531 | * entries present, or -EINVAL on error) |
1532 | */ |
1533 | |
1534 | while (!ret) { |
1535 | ret = ieee80211_radiotap_iterator_next(&iterator); |
1536 | |
1537 | if (ret) |
1538 | continue; |
1539 | |
1540 | /* see if this argument is something we can use */ |
1541 | switch (iterator.this_arg_index) { |
1542 | /* |
1543 | * You must take care when dereferencing iterator.this_arg |
1544 | * for multibyte types... the pointer is not aligned. Use |
1545 | * get_unaligned((type *)iterator.this_arg) to dereference |
1546 | * iterator.this_arg for type "type" safely on all arches. |
1547 | */ |
1548 | case IEEE80211_RADIOTAP_FLAGS: |
1549 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { |
1550 | /* |
1551 | * this indicates that the skb we have been |
1552 | * handed has the 32-bit FCS CRC at the end... |
1553 | * we should react to that by snipping it off |
1554 | * because it will be recomputed and added |
1555 | * on transmission |
1556 | */ |
1557 | if (skb->len < (iterator._max_length + FCS_LEN)) |
1558 | return false; |
1559 | |
1560 | skb_trim(skb, skb->len - FCS_LEN); |
1561 | } |
1562 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) |
1563 | info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; |
1564 | if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) |
1565 | info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; |
1566 | break; |
1567 | |
1568 | case IEEE80211_RADIOTAP_TX_FLAGS: |
1569 | txflags = get_unaligned_le16(iterator.this_arg); |
1570 | if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) |
1571 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
1572 | break; |
1573 | |
1574 | /* |
1575 | * Please update the file |
1576 | * Documentation/networking/mac80211-injection.txt |
1577 | * when parsing new fields here. |
1578 | */ |
1579 | |
1580 | default: |
1581 | break; |
1582 | } |
1583 | } |
1584 | |
1585 | if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ |
1586 | return false; |
1587 | |
1588 | /* |
1589 | * remove the radiotap header |
1590 | * iterator->_max_length was sanity-checked against |
1591 | * skb->len by iterator init |
1592 | */ |
1593 | skb_pull(skb, iterator._max_length); |
1594 | |
1595 | return true; |
1596 | } |
1597 | |
1598 | netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, |
1599 | struct net_device *dev) |
1600 | { |
1601 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
1602 | struct ieee80211_chanctx_conf *chanctx_conf; |
1603 | struct ieee80211_channel *chan; |
1604 | struct ieee80211_radiotap_header *prthdr = |
1605 | (struct ieee80211_radiotap_header *)skb->data; |
1606 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1607 | struct ieee80211_hdr *hdr; |
1608 | struct ieee80211_sub_if_data *tmp_sdata, *sdata; |
1609 | u16 len_rthdr; |
1610 | int hdrlen; |
1611 | |
1612 | /* check for not even having the fixed radiotap header part */ |
1613 | if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) |
1614 | goto fail; /* too short to be possibly valid */ |
1615 | |
1616 | /* is it a header version we can trust to find length from? */ |
1617 | if (unlikely(prthdr->it_version)) |
1618 | goto fail; /* only version 0 is supported */ |
1619 | |
1620 | /* then there must be a radiotap header with a length we can use */ |
1621 | len_rthdr = ieee80211_get_radiotap_len(skb->data); |
1622 | |
1623 | /* does the skb contain enough to deliver on the alleged length? */ |
1624 | if (unlikely(skb->len < len_rthdr)) |
1625 | goto fail; /* skb too short for claimed rt header extent */ |
1626 | |
1627 | /* |
1628 | * fix up the pointers accounting for the radiotap |
1629 | * header still being in there. We are being given |
1630 | * a precooked IEEE80211 header so no need for |
1631 | * normal processing |
1632 | */ |
1633 | skb_set_mac_header(skb, len_rthdr); |
1634 | /* |
1635 | * these are just fixed to the end of the rt area since we |
1636 | * don't have any better information and at this point, nobody cares |
1637 | */ |
1638 | skb_set_network_header(skb, len_rthdr); |
1639 | skb_set_transport_header(skb, len_rthdr); |
1640 | |
1641 | if (skb->len < len_rthdr + 2) |
1642 | goto fail; |
1643 | |
1644 | hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); |
1645 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
1646 | |
1647 | if (skb->len < len_rthdr + hdrlen) |
1648 | goto fail; |
1649 | |
1650 | /* |
1651 | * Initialize skb->protocol if the injected frame is a data frame |
1652 | * carrying a rfc1042 header |
1653 | */ |
1654 | if (ieee80211_is_data(hdr->frame_control) && |
1655 | skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { |
1656 | u8 *payload = (u8 *)hdr + hdrlen; |
1657 | |
1658 | if (ether_addr_equal(payload, rfc1042_header)) |
1659 | skb->protocol = cpu_to_be16((payload[6] << 8) | |
1660 | payload[7]); |
1661 | } |
1662 | |
1663 | memset(info, 0, sizeof(*info)); |
1664 | |
1665 | info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | |
1666 | IEEE80211_TX_CTL_INJECTED; |
1667 | |
1668 | /* process and remove the injection radiotap header */ |
1669 | if (!ieee80211_parse_tx_radiotap(skb)) |
1670 | goto fail; |
1671 | |
1672 | rcu_read_lock(); |
1673 | |
1674 | /* |
1675 | * We process outgoing injected frames that have a local address |
1676 | * we handle as though they are non-injected frames. |
1677 | * This code here isn't entirely correct, the local MAC address |
1678 | * isn't always enough to find the interface to use; for proper |
1679 | * VLAN/WDS support we will need a different mechanism (which |
1680 | * likely isn't going to be monitor interfaces). |
1681 | */ |
1682 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1683 | |
1684 | list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { |
1685 | if (!ieee80211_sdata_running(tmp_sdata)) |
1686 | continue; |
1687 | if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || |
1688 | tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || |
1689 | tmp_sdata->vif.type == NL80211_IFTYPE_WDS) |
1690 | continue; |
1691 | if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { |
1692 | sdata = tmp_sdata; |
1693 | break; |
1694 | } |
1695 | } |
1696 | |
1697 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
1698 | if (!chanctx_conf) { |
1699 | tmp_sdata = rcu_dereference(local->monitor_sdata); |
1700 | if (tmp_sdata) |
1701 | chanctx_conf = |
1702 | rcu_dereference(tmp_sdata->vif.chanctx_conf); |
1703 | } |
1704 | |
1705 | if (chanctx_conf) |
1706 | chan = chanctx_conf->def.chan; |
1707 | else if (!local->use_chanctx) |
1708 | chan = local->_oper_channel; |
1709 | else |
1710 | goto fail_rcu; |
1711 | |
1712 | /* |
1713 | * Frame injection is not allowed if beaconing is not allowed |
1714 | * or if we need radar detection. Beaconing is usually not allowed when |
1715 | * the mode or operation (Adhoc, AP, Mesh) does not support DFS. |
1716 | * Passive scan is also used in world regulatory domains where |
1717 | * your country is not known and as such it should be treated as |
1718 | * NO TX unless the channel is explicitly allowed in which case |
1719 | * your current regulatory domain would not have the passive scan |
1720 | * flag. |
1721 | * |
1722 | * Since AP mode uses monitor interfaces to inject/TX management |
1723 | * frames we can make AP mode the exception to this rule once it |
1724 | * supports radar detection as its implementation can deal with |
1725 | * radar detection by itself. We can do that later by adding a |
1726 | * monitor flag interfaces used for AP support. |
1727 | */ |
1728 | if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | |
1729 | IEEE80211_CHAN_PASSIVE_SCAN))) |
1730 | goto fail_rcu; |
1731 | |
1732 | ieee80211_xmit(sdata, skb, chan->band); |
1733 | rcu_read_unlock(); |
1734 | |
1735 | return NETDEV_TX_OK; |
1736 | |
1737 | fail_rcu: |
1738 | rcu_read_unlock(); |
1739 | fail: |
1740 | dev_kfree_skb(skb); |
1741 | return NETDEV_TX_OK; /* meaning, we dealt with the skb */ |
1742 | } |
1743 | |
1744 | /** |
1745 | * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type |
1746 | * subinterfaces (wlan#, WDS, and VLAN interfaces) |
1747 | * @skb: packet to be sent |
1748 | * @dev: incoming interface |
1749 | * |
1750 | * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will |
1751 | * not be freed, and caller is responsible for either retrying later or freeing |
1752 | * skb). |
1753 | * |
1754 | * This function takes in an Ethernet header and encapsulates it with suitable |
1755 | * IEEE 802.11 header based on which interface the packet is coming in. The |
1756 | * encapsulated packet will then be passed to master interface, wlan#.11, for |
1757 | * transmission (through low-level driver). |
1758 | */ |
1759 | netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, |
1760 | struct net_device *dev) |
1761 | { |
1762 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1763 | struct ieee80211_local *local = sdata->local; |
1764 | struct ieee80211_tx_info *info; |
1765 | int head_need; |
1766 | u16 ethertype, hdrlen, meshhdrlen = 0; |
1767 | __le16 fc; |
1768 | struct ieee80211_hdr hdr; |
1769 | struct ieee80211s_hdr mesh_hdr __maybe_unused; |
1770 | struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; |
1771 | const u8 *encaps_data; |
1772 | int encaps_len, skip_header_bytes; |
1773 | int nh_pos, h_pos; |
1774 | struct sta_info *sta = NULL; |
1775 | bool wme_sta = false, authorized = false, tdls_auth = false; |
1776 | bool tdls_direct = false; |
1777 | bool multicast; |
1778 | u32 info_flags = 0; |
1779 | u16 info_id = 0; |
1780 | struct ieee80211_chanctx_conf *chanctx_conf; |
1781 | struct ieee80211_sub_if_data *ap_sdata; |
1782 | enum ieee80211_band band; |
1783 | |
1784 | if (unlikely(skb->len < ETH_HLEN)) |
1785 | goto fail; |
1786 | |
1787 | /* convert Ethernet header to proper 802.11 header (based on |
1788 | * operation mode) */ |
1789 | ethertype = (skb->data[12] << 8) | skb->data[13]; |
1790 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
1791 | |
1792 | rcu_read_lock(); |
1793 | |
1794 | switch (sdata->vif.type) { |
1795 | case NL80211_IFTYPE_AP_VLAN: |
1796 | sta = rcu_dereference(sdata->u.vlan.sta); |
1797 | if (sta) { |
1798 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
1799 | /* RA TA DA SA */ |
1800 | memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); |
1801 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
1802 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1803 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); |
1804 | hdrlen = 30; |
1805 | authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); |
1806 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); |
1807 | } |
1808 | ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, |
1809 | u.ap); |
1810 | chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); |
1811 | if (!chanctx_conf) |
1812 | goto fail_rcu; |
1813 | band = chanctx_conf->def.chan->band; |
1814 | if (sta) |
1815 | break; |
1816 | /* fall through */ |
1817 | case NL80211_IFTYPE_AP: |
1818 | if (sdata->vif.type == NL80211_IFTYPE_AP) |
1819 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
1820 | if (!chanctx_conf) |
1821 | goto fail_rcu; |
1822 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
1823 | /* DA BSSID SA */ |
1824 | memcpy(hdr.addr1, skb->data, ETH_ALEN); |
1825 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
1826 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); |
1827 | hdrlen = 24; |
1828 | band = chanctx_conf->def.chan->band; |
1829 | break; |
1830 | case NL80211_IFTYPE_WDS: |
1831 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); |
1832 | /* RA TA DA SA */ |
1833 | memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); |
1834 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
1835 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1836 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); |
1837 | hdrlen = 30; |
1838 | /* |
1839 | * This is the exception! WDS style interfaces are prohibited |
1840 | * when channel contexts are in used so this must be valid |
1841 | */ |
1842 | band = local->hw.conf.channel->band; |
1843 | break; |
1844 | #ifdef CONFIG_MAC80211_MESH |
1845 | case NL80211_IFTYPE_MESH_POINT: |
1846 | if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { |
1847 | /* Do not send frames with mesh_ttl == 0 */ |
1848 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
1849 | goto fail_rcu; |
1850 | } |
1851 | |
1852 | if (!is_multicast_ether_addr(skb->data)) { |
1853 | struct sta_info *next_hop; |
1854 | bool mpp_lookup = true; |
1855 | |
1856 | mpath = mesh_path_lookup(sdata, skb->data); |
1857 | if (mpath) { |
1858 | mpp_lookup = false; |
1859 | next_hop = rcu_dereference(mpath->next_hop); |
1860 | if (!next_hop || |
1861 | !(mpath->flags & (MESH_PATH_ACTIVE | |
1862 | MESH_PATH_RESOLVING))) |
1863 | mpp_lookup = true; |
1864 | } |
1865 | |
1866 | if (mpp_lookup) |
1867 | mppath = mpp_path_lookup(sdata, skb->data); |
1868 | |
1869 | if (mppath && mpath) |
1870 | mesh_path_del(mpath->sdata, mpath->dst); |
1871 | } |
1872 | |
1873 | /* |
1874 | * Use address extension if it is a packet from |
1875 | * another interface or if we know the destination |
1876 | * is being proxied by a portal (i.e. portal address |
1877 | * differs from proxied address) |
1878 | */ |
1879 | if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && |
1880 | !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { |
1881 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1882 | skb->data, skb->data + ETH_ALEN); |
1883 | meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, |
1884 | NULL, NULL); |
1885 | } else { |
1886 | /* DS -> MBSS (802.11-2012 13.11.3.3). |
1887 | * For unicast with unknown forwarding information, |
1888 | * destination might be in the MBSS or if that fails |
1889 | * forwarded to another mesh gate. In either case |
1890 | * resolution will be handled in ieee80211_xmit(), so |
1891 | * leave the original DA. This also works for mcast */ |
1892 | const u8 *mesh_da = skb->data; |
1893 | |
1894 | if (mppath) |
1895 | mesh_da = mppath->mpp; |
1896 | else if (mpath) |
1897 | mesh_da = mpath->dst; |
1898 | |
1899 | hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, |
1900 | mesh_da, sdata->vif.addr); |
1901 | if (is_multicast_ether_addr(mesh_da)) |
1902 | /* DA TA mSA AE:SA */ |
1903 | meshhdrlen = ieee80211_new_mesh_header( |
1904 | sdata, &mesh_hdr, |
1905 | skb->data + ETH_ALEN, NULL); |
1906 | else |
1907 | /* RA TA mDA mSA AE:DA SA */ |
1908 | meshhdrlen = ieee80211_new_mesh_header( |
1909 | sdata, &mesh_hdr, skb->data, |
1910 | skb->data + ETH_ALEN); |
1911 | |
1912 | } |
1913 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
1914 | if (!chanctx_conf) |
1915 | goto fail_rcu; |
1916 | band = chanctx_conf->def.chan->band; |
1917 | break; |
1918 | #endif |
1919 | case NL80211_IFTYPE_STATION: |
1920 | if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { |
1921 | bool tdls_peer = false; |
1922 | |
1923 | sta = sta_info_get(sdata, skb->data); |
1924 | if (sta) { |
1925 | authorized = test_sta_flag(sta, |
1926 | WLAN_STA_AUTHORIZED); |
1927 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); |
1928 | tdls_peer = test_sta_flag(sta, |
1929 | WLAN_STA_TDLS_PEER); |
1930 | tdls_auth = test_sta_flag(sta, |
1931 | WLAN_STA_TDLS_PEER_AUTH); |
1932 | } |
1933 | |
1934 | /* |
1935 | * If the TDLS link is enabled, send everything |
1936 | * directly. Otherwise, allow TDLS setup frames |
1937 | * to be transmitted indirectly. |
1938 | */ |
1939 | tdls_direct = tdls_peer && (tdls_auth || |
1940 | !(ethertype == ETH_P_TDLS && skb->len > 14 && |
1941 | skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); |
1942 | } |
1943 | |
1944 | if (tdls_direct) { |
1945 | /* link during setup - throw out frames to peer */ |
1946 | if (!tdls_auth) |
1947 | goto fail_rcu; |
1948 | |
1949 | /* DA SA BSSID */ |
1950 | memcpy(hdr.addr1, skb->data, ETH_ALEN); |
1951 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1952 | memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); |
1953 | hdrlen = 24; |
1954 | } else if (sdata->u.mgd.use_4addr && |
1955 | cpu_to_be16(ethertype) != sdata->control_port_protocol) { |
1956 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | |
1957 | IEEE80211_FCTL_TODS); |
1958 | /* RA TA DA SA */ |
1959 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
1960 | memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); |
1961 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1962 | memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); |
1963 | hdrlen = 30; |
1964 | } else { |
1965 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
1966 | /* BSSID SA DA */ |
1967 | memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); |
1968 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1969 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
1970 | hdrlen = 24; |
1971 | } |
1972 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
1973 | if (!chanctx_conf) |
1974 | goto fail_rcu; |
1975 | band = chanctx_conf->def.chan->band; |
1976 | break; |
1977 | case NL80211_IFTYPE_ADHOC: |
1978 | /* DA SA BSSID */ |
1979 | memcpy(hdr.addr1, skb->data, ETH_ALEN); |
1980 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
1981 | memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); |
1982 | hdrlen = 24; |
1983 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
1984 | if (!chanctx_conf) |
1985 | goto fail_rcu; |
1986 | band = chanctx_conf->def.chan->band; |
1987 | break; |
1988 | default: |
1989 | goto fail_rcu; |
1990 | } |
1991 | |
1992 | /* |
1993 | * There's no need to try to look up the destination |
1994 | * if it is a multicast address (which can only happen |
1995 | * in AP mode) |
1996 | */ |
1997 | multicast = is_multicast_ether_addr(hdr.addr1); |
1998 | if (!multicast) { |
1999 | sta = sta_info_get(sdata, hdr.addr1); |
2000 | if (sta) { |
2001 | authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); |
2002 | wme_sta = test_sta_flag(sta, WLAN_STA_WME); |
2003 | } |
2004 | } |
2005 | |
2006 | /* For mesh, the use of the QoS header is mandatory */ |
2007 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2008 | wme_sta = true; |
2009 | |
2010 | /* receiver and we are QoS enabled, use a QoS type frame */ |
2011 | if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { |
2012 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
2013 | hdrlen += 2; |
2014 | } |
2015 | |
2016 | /* |
2017 | * Drop unicast frames to unauthorised stations unless they are |
2018 | * EAPOL frames from the local station. |
2019 | */ |
2020 | if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && |
2021 | !is_multicast_ether_addr(hdr.addr1) && !authorized && |
2022 | (cpu_to_be16(ethertype) != sdata->control_port_protocol || |
2023 | !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { |
2024 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
2025 | net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", |
2026 | dev->name, hdr.addr1); |
2027 | #endif |
2028 | |
2029 | I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); |
2030 | |
2031 | goto fail_rcu; |
2032 | } |
2033 | |
2034 | if (unlikely(!multicast && skb->sk && |
2035 | skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { |
2036 | struct sk_buff *orig_skb = skb; |
2037 | |
2038 | skb = skb_clone(skb, GFP_ATOMIC); |
2039 | if (skb) { |
2040 | unsigned long flags; |
2041 | int id; |
2042 | |
2043 | spin_lock_irqsave(&local->ack_status_lock, flags); |
2044 | id = idr_alloc(&local->ack_status_frames, orig_skb, |
2045 | 1, 0x10000, GFP_ATOMIC); |
2046 | spin_unlock_irqrestore(&local->ack_status_lock, flags); |
2047 | |
2048 | if (id >= 0) { |
2049 | info_id = id; |
2050 | info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; |
2051 | } else if (skb_shared(skb)) { |
2052 | kfree_skb(orig_skb); |
2053 | } else { |
2054 | kfree_skb(skb); |
2055 | skb = orig_skb; |
2056 | } |
2057 | } else { |
2058 | /* couldn't clone -- lose tx status ... */ |
2059 | skb = orig_skb; |
2060 | } |
2061 | } |
2062 | |
2063 | /* |
2064 | * If the skb is shared we need to obtain our own copy. |
2065 | */ |
2066 | if (skb_shared(skb)) { |
2067 | struct sk_buff *tmp_skb = skb; |
2068 | |
2069 | /* can't happen -- skb is a clone if info_id != 0 */ |
2070 | WARN_ON(info_id); |
2071 | |
2072 | skb = skb_clone(skb, GFP_ATOMIC); |
2073 | kfree_skb(tmp_skb); |
2074 | |
2075 | if (!skb) |
2076 | goto fail_rcu; |
2077 | } |
2078 | |
2079 | hdr.frame_control = fc; |
2080 | hdr.duration_id = 0; |
2081 | hdr.seq_ctrl = 0; |
2082 | |
2083 | skip_header_bytes = ETH_HLEN; |
2084 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { |
2085 | encaps_data = bridge_tunnel_header; |
2086 | encaps_len = sizeof(bridge_tunnel_header); |
2087 | skip_header_bytes -= 2; |
2088 | } else if (ethertype >= 0x600) { |
2089 | encaps_data = rfc1042_header; |
2090 | encaps_len = sizeof(rfc1042_header); |
2091 | skip_header_bytes -= 2; |
2092 | } else { |
2093 | encaps_data = NULL; |
2094 | encaps_len = 0; |
2095 | } |
2096 | |
2097 | nh_pos = skb_network_header(skb) - skb->data; |
2098 | h_pos = skb_transport_header(skb) - skb->data; |
2099 | |
2100 | skb_pull(skb, skip_header_bytes); |
2101 | nh_pos -= skip_header_bytes; |
2102 | h_pos -= skip_header_bytes; |
2103 | |
2104 | head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); |
2105 | |
2106 | /* |
2107 | * So we need to modify the skb header and hence need a copy of |
2108 | * that. The head_need variable above doesn't, so far, include |
2109 | * the needed header space that we don't need right away. If we |
2110 | * can, then we don't reallocate right now but only after the |
2111 | * frame arrives at the master device (if it does...) |
2112 | * |
2113 | * If we cannot, however, then we will reallocate to include all |
2114 | * the ever needed space. Also, if we need to reallocate it anyway, |
2115 | * make it big enough for everything we may ever need. |
2116 | */ |
2117 | |
2118 | if (head_need > 0 || skb_cloned(skb)) { |
2119 | head_need += IEEE80211_ENCRYPT_HEADROOM; |
2120 | head_need += local->tx_headroom; |
2121 | head_need = max_t(int, 0, head_need); |
2122 | if (ieee80211_skb_resize(sdata, skb, head_need, true)) { |
2123 | ieee80211_free_txskb(&local->hw, skb); |
2124 | skb = NULL; |
2125 | goto fail_rcu; |
2126 | } |
2127 | } |
2128 | |
2129 | if (encaps_data) { |
2130 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); |
2131 | nh_pos += encaps_len; |
2132 | h_pos += encaps_len; |
2133 | } |
2134 | |
2135 | #ifdef CONFIG_MAC80211_MESH |
2136 | if (meshhdrlen > 0) { |
2137 | memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); |
2138 | nh_pos += meshhdrlen; |
2139 | h_pos += meshhdrlen; |
2140 | } |
2141 | #endif |
2142 | |
2143 | if (ieee80211_is_data_qos(fc)) { |
2144 | __le16 *qos_control; |
2145 | |
2146 | qos_control = (__le16*) skb_push(skb, 2); |
2147 | memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); |
2148 | /* |
2149 | * Maybe we could actually set some fields here, for now just |
2150 | * initialise to zero to indicate no special operation. |
2151 | */ |
2152 | *qos_control = 0; |
2153 | } else |
2154 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); |
2155 | |
2156 | nh_pos += hdrlen; |
2157 | h_pos += hdrlen; |
2158 | |
2159 | dev->stats.tx_packets++; |
2160 | dev->stats.tx_bytes += skb->len; |
2161 | |
2162 | /* Update skb pointers to various headers since this modified frame |
2163 | * is going to go through Linux networking code that may potentially |
2164 | * need things like pointer to IP header. */ |
2165 | skb_set_mac_header(skb, 0); |
2166 | skb_set_network_header(skb, nh_pos); |
2167 | skb_set_transport_header(skb, h_pos); |
2168 | |
2169 | info = IEEE80211_SKB_CB(skb); |
2170 | memset(info, 0, sizeof(*info)); |
2171 | |
2172 | dev->trans_start = jiffies; |
2173 | |
2174 | info->flags = info_flags; |
2175 | info->ack_frame_id = info_id; |
2176 | |
2177 | ieee80211_xmit(sdata, skb, band); |
2178 | rcu_read_unlock(); |
2179 | |
2180 | return NETDEV_TX_OK; |
2181 | |
2182 | fail_rcu: |
2183 | rcu_read_unlock(); |
2184 | fail: |
2185 | dev_kfree_skb(skb); |
2186 | return NETDEV_TX_OK; |
2187 | } |
2188 | |
2189 | |
2190 | /* |
2191 | * ieee80211_clear_tx_pending may not be called in a context where |
2192 | * it is possible that it packets could come in again. |
2193 | */ |
2194 | void ieee80211_clear_tx_pending(struct ieee80211_local *local) |
2195 | { |
2196 | struct sk_buff *skb; |
2197 | int i; |
2198 | |
2199 | for (i = 0; i < local->hw.queues; i++) { |
2200 | while ((skb = skb_dequeue(&local->pending[i])) != NULL) |
2201 | ieee80211_free_txskb(&local->hw, skb); |
2202 | } |
2203 | } |
2204 | |
2205 | /* |
2206 | * Returns false if the frame couldn't be transmitted but was queued instead, |
2207 | * which in this case means re-queued -- take as an indication to stop sending |
2208 | * more pending frames. |
2209 | */ |
2210 | static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, |
2211 | struct sk_buff *skb) |
2212 | { |
2213 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2214 | struct ieee80211_sub_if_data *sdata; |
2215 | struct sta_info *sta; |
2216 | struct ieee80211_hdr *hdr; |
2217 | bool result; |
2218 | struct ieee80211_chanctx_conf *chanctx_conf; |
2219 | |
2220 | sdata = vif_to_sdata(info->control.vif); |
2221 | |
2222 | if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { |
2223 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
2224 | if (unlikely(!chanctx_conf)) { |
2225 | dev_kfree_skb(skb); |
2226 | return true; |
2227 | } |
2228 | result = ieee80211_tx(sdata, skb, true, |
2229 | chanctx_conf->def.chan->band); |
2230 | } else { |
2231 | struct sk_buff_head skbs; |
2232 | |
2233 | __skb_queue_head_init(&skbs); |
2234 | __skb_queue_tail(&skbs, skb); |
2235 | |
2236 | hdr = (struct ieee80211_hdr *)skb->data; |
2237 | sta = sta_info_get(sdata, hdr->addr1); |
2238 | |
2239 | result = __ieee80211_tx(local, &skbs, skb->len, sta, true); |
2240 | } |
2241 | |
2242 | return result; |
2243 | } |
2244 | |
2245 | /* |
2246 | * Transmit all pending packets. Called from tasklet. |
2247 | */ |
2248 | void ieee80211_tx_pending(unsigned long data) |
2249 | { |
2250 | struct ieee80211_local *local = (struct ieee80211_local *)data; |
2251 | unsigned long flags; |
2252 | int i; |
2253 | bool txok; |
2254 | |
2255 | rcu_read_lock(); |
2256 | |
2257 | spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
2258 | for (i = 0; i < local->hw.queues; i++) { |
2259 | /* |
2260 | * If queue is stopped by something other than due to pending |
2261 | * frames, or we have no pending frames, proceed to next queue. |
2262 | */ |
2263 | if (local->queue_stop_reasons[i] || |
2264 | skb_queue_empty(&local->pending[i])) |
2265 | continue; |
2266 | |
2267 | while (!skb_queue_empty(&local->pending[i])) { |
2268 | struct sk_buff *skb = __skb_dequeue(&local->pending[i]); |
2269 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
2270 | |
2271 | if (WARN_ON(!info->control.vif)) { |
2272 | ieee80211_free_txskb(&local->hw, skb); |
2273 | continue; |
2274 | } |
2275 | |
2276 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, |
2277 | flags); |
2278 | |
2279 | txok = ieee80211_tx_pending_skb(local, skb); |
2280 | spin_lock_irqsave(&local->queue_stop_reason_lock, |
2281 | flags); |
2282 | if (!txok) |
2283 | break; |
2284 | } |
2285 | |
2286 | if (skb_queue_empty(&local->pending[i])) |
2287 | ieee80211_propagate_queue_wake(local, i); |
2288 | } |
2289 | spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
2290 | |
2291 | rcu_read_unlock(); |
2292 | } |
2293 | |
2294 | /* functions for drivers to get certain frames */ |
2295 | |
2296 | static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, |
2297 | struct ps_data *ps, struct sk_buff *skb) |
2298 | { |
2299 | u8 *pos, *tim; |
2300 | int aid0 = 0; |
2301 | int i, have_bits = 0, n1, n2; |
2302 | |
2303 | /* Generate bitmap for TIM only if there are any STAs in power save |
2304 | * mode. */ |
2305 | if (atomic_read(&ps->num_sta_ps) > 0) |
2306 | /* in the hope that this is faster than |
2307 | * checking byte-for-byte */ |
2308 | have_bits = !bitmap_empty((unsigned long*)ps->tim, |
2309 | IEEE80211_MAX_AID+1); |
2310 | |
2311 | if (ps->dtim_count == 0) |
2312 | ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; |
2313 | else |
2314 | ps->dtim_count--; |
2315 | |
2316 | tim = pos = (u8 *) skb_put(skb, 6); |
2317 | *pos++ = WLAN_EID_TIM; |
2318 | *pos++ = 4; |
2319 | *pos++ = ps->dtim_count; |
2320 | *pos++ = sdata->vif.bss_conf.dtim_period; |
2321 | |
2322 | if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) |
2323 | aid0 = 1; |
2324 | |
2325 | ps->dtim_bc_mc = aid0 == 1; |
2326 | |
2327 | if (have_bits) { |
2328 | /* Find largest even number N1 so that bits numbered 1 through |
2329 | * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits |
2330 | * (N2 + 1) x 8 through 2007 are 0. */ |
2331 | n1 = 0; |
2332 | for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { |
2333 | if (ps->tim[i]) { |
2334 | n1 = i & 0xfe; |
2335 | break; |
2336 | } |
2337 | } |
2338 | n2 = n1; |
2339 | for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { |
2340 | if (ps->tim[i]) { |
2341 | n2 = i; |
2342 | break; |
2343 | } |
2344 | } |
2345 | |
2346 | /* Bitmap control */ |
2347 | *pos++ = n1 | aid0; |
2348 | /* Part Virt Bitmap */ |
2349 | skb_put(skb, n2 - n1); |
2350 | memcpy(pos, ps->tim + n1, n2 - n1 + 1); |
2351 | |
2352 | tim[1] = n2 - n1 + 4; |
2353 | } else { |
2354 | *pos++ = aid0; /* Bitmap control */ |
2355 | *pos++ = 0; /* Part Virt Bitmap */ |
2356 | } |
2357 | } |
2358 | |
2359 | static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, |
2360 | struct ps_data *ps, struct sk_buff *skb) |
2361 | { |
2362 | struct ieee80211_local *local = sdata->local; |
2363 | |
2364 | /* |
2365 | * Not very nice, but we want to allow the driver to call |
2366 | * ieee80211_beacon_get() as a response to the set_tim() |
2367 | * callback. That, however, is already invoked under the |
2368 | * sta_lock to guarantee consistent and race-free update |
2369 | * of the tim bitmap in mac80211 and the driver. |
2370 | */ |
2371 | if (local->tim_in_locked_section) { |
2372 | __ieee80211_beacon_add_tim(sdata, ps, skb); |
2373 | } else { |
2374 | spin_lock_bh(&local->tim_lock); |
2375 | __ieee80211_beacon_add_tim(sdata, ps, skb); |
2376 | spin_unlock_bh(&local->tim_lock); |
2377 | } |
2378 | |
2379 | return 0; |
2380 | } |
2381 | |
2382 | struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, |
2383 | struct ieee80211_vif *vif, |
2384 | u16 *tim_offset, u16 *tim_length) |
2385 | { |
2386 | struct ieee80211_local *local = hw_to_local(hw); |
2387 | struct sk_buff *skb = NULL; |
2388 | struct ieee80211_tx_info *info; |
2389 | struct ieee80211_sub_if_data *sdata = NULL; |
2390 | enum ieee80211_band band; |
2391 | struct ieee80211_tx_rate_control txrc; |
2392 | struct ieee80211_chanctx_conf *chanctx_conf; |
2393 | |
2394 | rcu_read_lock(); |
2395 | |
2396 | sdata = vif_to_sdata(vif); |
2397 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
2398 | |
2399 | if (!ieee80211_sdata_running(sdata) || !chanctx_conf) |
2400 | goto out; |
2401 | |
2402 | if (tim_offset) |
2403 | *tim_offset = 0; |
2404 | if (tim_length) |
2405 | *tim_length = 0; |
2406 | |
2407 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
2408 | struct ieee80211_if_ap *ap = &sdata->u.ap; |
2409 | struct beacon_data *beacon = rcu_dereference(ap->beacon); |
2410 | |
2411 | if (beacon) { |
2412 | /* |
2413 | * headroom, head length, |
2414 | * tail length and maximum TIM length |
2415 | */ |
2416 | skb = dev_alloc_skb(local->tx_headroom + |
2417 | beacon->head_len + |
2418 | beacon->tail_len + 256); |
2419 | if (!skb) |
2420 | goto out; |
2421 | |
2422 | skb_reserve(skb, local->tx_headroom); |
2423 | memcpy(skb_put(skb, beacon->head_len), beacon->head, |
2424 | beacon->head_len); |
2425 | |
2426 | ieee80211_beacon_add_tim(sdata, &ap->ps, skb); |
2427 | |
2428 | if (tim_offset) |
2429 | *tim_offset = beacon->head_len; |
2430 | if (tim_length) |
2431 | *tim_length = skb->len - beacon->head_len; |
2432 | |
2433 | if (beacon->tail) |
2434 | memcpy(skb_put(skb, beacon->tail_len), |
2435 | beacon->tail, beacon->tail_len); |
2436 | } else |
2437 | goto out; |
2438 | } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
2439 | struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; |
2440 | struct ieee80211_hdr *hdr; |
2441 | struct sk_buff *presp = rcu_dereference(ifibss->presp); |
2442 | |
2443 | if (!presp) |
2444 | goto out; |
2445 | |
2446 | skb = skb_copy(presp, GFP_ATOMIC); |
2447 | if (!skb) |
2448 | goto out; |
2449 | |
2450 | hdr = (struct ieee80211_hdr *) skb->data; |
2451 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2452 | IEEE80211_STYPE_BEACON); |
2453 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
2454 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
2455 | struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); |
2456 | |
2457 | if (!bcn) |
2458 | goto out; |
2459 | |
2460 | if (ifmsh->sync_ops) |
2461 | ifmsh->sync_ops->adjust_tbtt( |
2462 | sdata); |
2463 | |
2464 | skb = dev_alloc_skb(local->tx_headroom + |
2465 | bcn->head_len + |
2466 | 256 + /* TIM IE */ |
2467 | bcn->tail_len); |
2468 | if (!skb) |
2469 | goto out; |
2470 | skb_reserve(skb, local->tx_headroom); |
2471 | memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); |
2472 | ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); |
2473 | memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); |
2474 | } else { |
2475 | WARN_ON(1); |
2476 | goto out; |
2477 | } |
2478 | |
2479 | band = chanctx_conf->def.chan->band; |
2480 | |
2481 | info = IEEE80211_SKB_CB(skb); |
2482 | |
2483 | info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
2484 | info->flags |= IEEE80211_TX_CTL_NO_ACK; |
2485 | info->band = band; |
2486 | |
2487 | memset(&txrc, 0, sizeof(txrc)); |
2488 | txrc.hw = hw; |
2489 | txrc.sband = local->hw.wiphy->bands[band]; |
2490 | txrc.bss_conf = &sdata->vif.bss_conf; |
2491 | txrc.skb = skb; |
2492 | txrc.reported_rate.idx = -1; |
2493 | txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; |
2494 | if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) |
2495 | txrc.max_rate_idx = -1; |
2496 | else |
2497 | txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; |
2498 | memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], |
2499 | sizeof(txrc.rate_idx_mcs_mask)); |
2500 | txrc.bss = true; |
2501 | rate_control_get_rate(sdata, NULL, &txrc); |
2502 | |
2503 | info->control.vif = vif; |
2504 | |
2505 | info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | |
2506 | IEEE80211_TX_CTL_ASSIGN_SEQ | |
2507 | IEEE80211_TX_CTL_FIRST_FRAGMENT; |
2508 | out: |
2509 | rcu_read_unlock(); |
2510 | return skb; |
2511 | } |
2512 | EXPORT_SYMBOL(ieee80211_beacon_get_tim); |
2513 | |
2514 | struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, |
2515 | struct ieee80211_vif *vif) |
2516 | { |
2517 | struct ieee80211_if_ap *ap = NULL; |
2518 | struct sk_buff *skb = NULL; |
2519 | struct probe_resp *presp = NULL; |
2520 | struct ieee80211_hdr *hdr; |
2521 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
2522 | |
2523 | if (sdata->vif.type != NL80211_IFTYPE_AP) |
2524 | return NULL; |
2525 | |
2526 | rcu_read_lock(); |
2527 | |
2528 | ap = &sdata->u.ap; |
2529 | presp = rcu_dereference(ap->probe_resp); |
2530 | if (!presp) |
2531 | goto out; |
2532 | |
2533 | skb = dev_alloc_skb(presp->len); |
2534 | if (!skb) |
2535 | goto out; |
2536 | |
2537 | memcpy(skb_put(skb, presp->len), presp->data, presp->len); |
2538 | |
2539 | hdr = (struct ieee80211_hdr *) skb->data; |
2540 | memset(hdr->addr1, 0, sizeof(hdr->addr1)); |
2541 | |
2542 | out: |
2543 | rcu_read_unlock(); |
2544 | return skb; |
2545 | } |
2546 | EXPORT_SYMBOL(ieee80211_proberesp_get); |
2547 | |
2548 | struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, |
2549 | struct ieee80211_vif *vif) |
2550 | { |
2551 | struct ieee80211_sub_if_data *sdata; |
2552 | struct ieee80211_if_managed *ifmgd; |
2553 | struct ieee80211_pspoll *pspoll; |
2554 | struct ieee80211_local *local; |
2555 | struct sk_buff *skb; |
2556 | |
2557 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) |
2558 | return NULL; |
2559 | |
2560 | sdata = vif_to_sdata(vif); |
2561 | ifmgd = &sdata->u.mgd; |
2562 | local = sdata->local; |
2563 | |
2564 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); |
2565 | if (!skb) |
2566 | return NULL; |
2567 | |
2568 | skb_reserve(skb, local->hw.extra_tx_headroom); |
2569 | |
2570 | pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); |
2571 | memset(pspoll, 0, sizeof(*pspoll)); |
2572 | pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
2573 | IEEE80211_STYPE_PSPOLL); |
2574 | pspoll->aid = cpu_to_le16(ifmgd->aid); |
2575 | |
2576 | /* aid in PS-Poll has its two MSBs each set to 1 */ |
2577 | pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); |
2578 | |
2579 | memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); |
2580 | memcpy(pspoll->ta, vif->addr, ETH_ALEN); |
2581 | |
2582 | return skb; |
2583 | } |
2584 | EXPORT_SYMBOL(ieee80211_pspoll_get); |
2585 | |
2586 | struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, |
2587 | struct ieee80211_vif *vif) |
2588 | { |
2589 | struct ieee80211_hdr_3addr *nullfunc; |
2590 | struct ieee80211_sub_if_data *sdata; |
2591 | struct ieee80211_if_managed *ifmgd; |
2592 | struct ieee80211_local *local; |
2593 | struct sk_buff *skb; |
2594 | |
2595 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) |
2596 | return NULL; |
2597 | |
2598 | sdata = vif_to_sdata(vif); |
2599 | ifmgd = &sdata->u.mgd; |
2600 | local = sdata->local; |
2601 | |
2602 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); |
2603 | if (!skb) |
2604 | return NULL; |
2605 | |
2606 | skb_reserve(skb, local->hw.extra_tx_headroom); |
2607 | |
2608 | nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, |
2609 | sizeof(*nullfunc)); |
2610 | memset(nullfunc, 0, sizeof(*nullfunc)); |
2611 | nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | |
2612 | IEEE80211_STYPE_NULLFUNC | |
2613 | IEEE80211_FCTL_TODS); |
2614 | memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); |
2615 | memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); |
2616 | memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); |
2617 | |
2618 | return skb; |
2619 | } |
2620 | EXPORT_SYMBOL(ieee80211_nullfunc_get); |
2621 | |
2622 | struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, |
2623 | struct ieee80211_vif *vif, |
2624 | const u8 *ssid, size_t ssid_len, |
2625 | size_t tailroom) |
2626 | { |
2627 | struct ieee80211_sub_if_data *sdata; |
2628 | struct ieee80211_local *local; |
2629 | struct ieee80211_hdr_3addr *hdr; |
2630 | struct sk_buff *skb; |
2631 | size_t ie_ssid_len; |
2632 | u8 *pos; |
2633 | |
2634 | sdata = vif_to_sdata(vif); |
2635 | local = sdata->local; |
2636 | ie_ssid_len = 2 + ssid_len; |
2637 | |
2638 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + |
2639 | ie_ssid_len + tailroom); |
2640 | if (!skb) |
2641 | return NULL; |
2642 | |
2643 | skb_reserve(skb, local->hw.extra_tx_headroom); |
2644 | |
2645 | hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); |
2646 | memset(hdr, 0, sizeof(*hdr)); |
2647 | hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
2648 | IEEE80211_STYPE_PROBE_REQ); |
2649 | eth_broadcast_addr(hdr->addr1); |
2650 | memcpy(hdr->addr2, vif->addr, ETH_ALEN); |
2651 | eth_broadcast_addr(hdr->addr3); |
2652 | |
2653 | pos = skb_put(skb, ie_ssid_len); |
2654 | *pos++ = WLAN_EID_SSID; |
2655 | *pos++ = ssid_len; |
2656 | if (ssid_len) |
2657 | memcpy(pos, ssid, ssid_len); |
2658 | pos += ssid_len; |
2659 | |
2660 | return skb; |
2661 | } |
2662 | EXPORT_SYMBOL(ieee80211_probereq_get); |
2663 | |
2664 | void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
2665 | const void *frame, size_t frame_len, |
2666 | const struct ieee80211_tx_info *frame_txctl, |
2667 | struct ieee80211_rts *rts) |
2668 | { |
2669 | const struct ieee80211_hdr *hdr = frame; |
2670 | |
2671 | rts->frame_control = |
2672 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); |
2673 | rts->duration = ieee80211_rts_duration(hw, vif, frame_len, |
2674 | frame_txctl); |
2675 | memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); |
2676 | memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); |
2677 | } |
2678 | EXPORT_SYMBOL(ieee80211_rts_get); |
2679 | |
2680 | void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, |
2681 | const void *frame, size_t frame_len, |
2682 | const struct ieee80211_tx_info *frame_txctl, |
2683 | struct ieee80211_cts *cts) |
2684 | { |
2685 | const struct ieee80211_hdr *hdr = frame; |
2686 | |
2687 | cts->frame_control = |
2688 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); |
2689 | cts->duration = ieee80211_ctstoself_duration(hw, vif, |
2690 | frame_len, frame_txctl); |
2691 | memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); |
2692 | } |
2693 | EXPORT_SYMBOL(ieee80211_ctstoself_get); |
2694 | |
2695 | struct sk_buff * |
2696 | ieee80211_get_buffered_bc(struct ieee80211_hw *hw, |
2697 | struct ieee80211_vif *vif) |
2698 | { |
2699 | struct ieee80211_local *local = hw_to_local(hw); |
2700 | struct sk_buff *skb = NULL; |
2701 | struct ieee80211_tx_data tx; |
2702 | struct ieee80211_sub_if_data *sdata; |
2703 | struct ps_data *ps; |
2704 | struct ieee80211_tx_info *info; |
2705 | struct ieee80211_chanctx_conf *chanctx_conf; |
2706 | |
2707 | sdata = vif_to_sdata(vif); |
2708 | |
2709 | rcu_read_lock(); |
2710 | chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); |
2711 | |
2712 | if (!chanctx_conf) |
2713 | goto out; |
2714 | |
2715 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
2716 | struct beacon_data *beacon = |
2717 | rcu_dereference(sdata->u.ap.beacon); |
2718 | |
2719 | if (!beacon || !beacon->head) |
2720 | goto out; |
2721 | |
2722 | ps = &sdata->u.ap.ps; |
2723 | } else if (ieee80211_vif_is_mesh(&sdata->vif)) { |
2724 | ps = &sdata->u.mesh.ps; |
2725 | } else { |
2726 | goto out; |
2727 | } |
2728 | |
2729 | if (ps->dtim_count != 0 || !ps->dtim_bc_mc) |
2730 | goto out; /* send buffered bc/mc only after DTIM beacon */ |
2731 | |
2732 | while (1) { |
2733 | skb = skb_dequeue(&ps->bc_buf); |
2734 | if (!skb) |
2735 | goto out; |
2736 | local->total_ps_buffered--; |
2737 | |
2738 | if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { |
2739 | struct ieee80211_hdr *hdr = |
2740 | (struct ieee80211_hdr *) skb->data; |
2741 | /* more buffered multicast/broadcast frames ==> set |
2742 | * MoreData flag in IEEE 802.11 header to inform PS |
2743 | * STAs */ |
2744 | hdr->frame_control |= |
2745 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
2746 | } |
2747 | |
2748 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
2749 | sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); |
2750 | if (!ieee80211_tx_prepare(sdata, &tx, skb)) |
2751 | break; |
2752 | dev_kfree_skb_any(skb); |
2753 | } |
2754 | |
2755 | info = IEEE80211_SKB_CB(skb); |
2756 | |
2757 | tx.flags |= IEEE80211_TX_PS_BUFFERED; |
2758 | info->band = chanctx_conf->def.chan->band; |
2759 | |
2760 | if (invoke_tx_handlers(&tx)) |
2761 | skb = NULL; |
2762 | out: |
2763 | rcu_read_unlock(); |
2764 | |
2765 | return skb; |
2766 | } |
2767 | EXPORT_SYMBOL(ieee80211_get_buffered_bc); |
2768 | |
2769 | void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, |
2770 | struct sk_buff *skb, int tid, |
2771 | enum ieee80211_band band) |
2772 | { |
2773 | int ac = ieee802_1d_to_ac[tid & 7]; |
2774 | |
2775 | skb_set_mac_header(skb, 0); |
2776 | skb_set_network_header(skb, 0); |
2777 | skb_set_transport_header(skb, 0); |
2778 | |
2779 | skb_set_queue_mapping(skb, ac); |
2780 | skb->priority = tid; |
2781 | |
2782 | skb->dev = sdata->dev; |
2783 | |
2784 | /* |
2785 | * The other path calling ieee80211_xmit is from the tasklet, |
2786 | * and while we can handle concurrent transmissions locking |
2787 | * requirements are that we do not come into tx with bhs on. |
2788 | */ |
2789 | local_bh_disable(); |
2790 | ieee80211_xmit(sdata, skb, band); |
2791 | local_bh_enable(); |
2792 | } |
2793 |
Branches:
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9