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Johannes Bergfe7a5d52009-11-18 18:42:47 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Jouni Malinen026331c2010-02-15 12:53:10 +02005 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Bergfe7a5d52009-11-18 18:42:47 +01006 *
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#include <net/mac80211.h>
13#include "ieee80211_i.h"
14#include "rate.h"
15#include "mesh.h"
16#include "led.h"
17
18
19void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
20 struct sk_buff *skb)
21{
22 struct ieee80211_local *local = hw_to_local(hw);
23 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
24 int tmp;
25
26 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
27 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
28 &local->skb_queue : &local->skb_queue_unreliable, skb);
29 tmp = skb_queue_len(&local->skb_queue) +
30 skb_queue_len(&local->skb_queue_unreliable);
31 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
32 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
33 dev_kfree_skb_irq(skb);
34 tmp--;
35 I802_DEBUG_INC(local->tx_status_drop);
36 }
37 tasklet_schedule(&local->tasklet);
38}
39EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
40
41static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
42 struct sta_info *sta,
43 struct sk_buff *skb)
44{
45 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
46
47 /*
Johannes Berg697e6a02010-01-17 01:47:56 +010048 * This skb 'survived' a round-trip through the driver, and
49 * hopefully the driver didn't mangle it too badly. However,
Walter Goldens77c20612010-05-18 04:44:54 -070050 * we can definitely not rely on the control information
Johannes Bergc6fcf6b2010-01-17 01:47:59 +010051 * being correct. Clear it so we don't get junk there, and
52 * indicate that it needs new processing, but must not be
53 * modified/encrypted again.
Johannes Berg697e6a02010-01-17 01:47:56 +010054 */
55 memset(&info->control, 0, sizeof(info->control));
Johannes Berg18c94902010-01-25 19:07:39 +010056
57 info->control.jiffies = jiffies;
58 info->control.vif = &sta->sdata->vif;
Johannes Bergc6fcf6b2010-01-17 01:47:59 +010059 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
60 IEEE80211_TX_INTFL_RETRANSMISSION;
Johannes Berg697e6a02010-01-17 01:47:56 +010061
Johannes Bergfe7a5d52009-11-18 18:42:47 +010062 sta->tx_filtered_count++;
63
64 /*
65 * Clear the TX filter mask for this STA when sending the next
66 * packet. If the STA went to power save mode, this will happen
67 * when it wakes up for the next time.
68 */
69 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
70
71 /*
72 * This code races in the following way:
73 *
74 * (1) STA sends frame indicating it will go to sleep and does so
75 * (2) hardware/firmware adds STA to filter list, passes frame up
76 * (3) hardware/firmware processes TX fifo and suppresses a frame
77 * (4) we get TX status before having processed the frame and
78 * knowing that the STA has gone to sleep.
79 *
80 * This is actually quite unlikely even when both those events are
81 * processed from interrupts coming in quickly after one another or
82 * even at the same time because we queue both TX status events and
83 * RX frames to be processed by a tasklet and process them in the
84 * same order that they were received or TX status last. Hence, there
85 * is no race as long as the frame RX is processed before the next TX
86 * status, which drivers can ensure, see below.
87 *
88 * Note that this can only happen if the hardware or firmware can
89 * actually add STAs to the filter list, if this is done by the
90 * driver in response to set_tim() (which will only reduce the race
91 * this whole filtering tries to solve, not completely solve it)
92 * this situation cannot happen.
93 *
94 * To completely solve this race drivers need to make sure that they
95 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
96 * functions and
97 * (b) always process RX events before TX status events if ordering
98 * can be unknown, for example with different interrupt status
99 * bits.
100 */
101 if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
102 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
103 skb_queue_tail(&sta->tx_filtered, skb);
104 return;
105 }
106
107 if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
108 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
109 /* Software retry the packet once */
110 info->flags |= IEEE80211_TX_INTFL_RETRIED;
111 ieee80211_add_pending_skb(local, skb);
112 return;
113 }
114
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100115#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
116 if (net_ratelimit())
117 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
118 "queue_len=%d PS=%d @%lu\n",
119 wiphy_name(local->hw.wiphy),
120 skb_queue_len(&sta->tx_filtered),
121 !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
122#endif
123 dev_kfree_skb(skb);
124}
125
Johannes Berg0f782312009-12-01 13:37:02 +0100126static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
127{
128 struct ieee80211_mgmt *mgmt = (void *) skb->data;
129 struct ieee80211_local *local = sta->local;
130 struct ieee80211_sub_if_data *sdata = sta->sdata;
131
132 if (ieee80211_is_action(mgmt->frame_control) &&
133 sdata->vif.type == NL80211_IFTYPE_STATION &&
134 mgmt->u.action.category == WLAN_CATEGORY_HT &&
135 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
136 /*
137 * This update looks racy, but isn't -- if we come
138 * here we've definitely got a station that we're
139 * talking to, and on a managed interface that can
140 * only be the AP. And the only other place updating
141 * this variable is before we're associated.
142 */
143 switch (mgmt->u.action.u.ht_smps.smps_control) {
144 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
145 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
146 break;
147 case WLAN_HT_SMPS_CONTROL_STATIC:
148 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
149 break;
150 case WLAN_HT_SMPS_CONTROL_DISABLED:
151 default: /* shouldn't happen since we don't send that */
152 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
153 break;
154 }
155
156 ieee80211_queue_work(&local->hw, &local->recalc_smps);
157 }
158}
159
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100160void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
161{
162 struct sk_buff *skb2;
163 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
164 struct ieee80211_local *local = hw_to_local(hw);
165 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
166 u16 frag, type;
167 __le16 fc;
168 struct ieee80211_supported_band *sband;
169 struct ieee80211_tx_status_rtap_hdr *rthdr;
170 struct ieee80211_sub_if_data *sdata;
171 struct net_device *prev_dev = NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100172 struct sta_info *sta, *tmp;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100173 int retry_count = -1, i;
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300174 int rates_idx = -1;
Felix Fietkaueaf55532010-03-11 16:28:24 +0100175 bool send_to_cooked;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100176
177 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
178 /* the HW cannot have attempted that rate */
179 if (i >= hw->max_rates) {
180 info->status.rates[i].idx = -1;
181 info->status.rates[i].count = 0;
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300182 } else if (info->status.rates[i].idx >= 0) {
183 rates_idx = i;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100184 }
185
186 retry_count += info->status.rates[i].count;
187 }
188 if (retry_count < 0)
189 retry_count = 0;
190
191 rcu_read_lock();
192
193 sband = local->hw.wiphy->bands[info->band];
Vivek Natarajan375177b2010-02-09 14:50:28 +0530194 fc = hdr->frame_control;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100195
Johannes Bergabe60632009-11-25 17:46:18 +0100196 for_each_sta_info(local, hdr->addr1, sta, tmp) {
197 /* skip wrong virtual interface */
Johannes Berg47846c92009-11-25 17:46:19 +0100198 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
Johannes Bergabe60632009-11-25 17:46:18 +0100199 continue;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100200
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100201 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
202 test_sta_flags(sta, WLAN_STA_PS_STA)) {
203 /*
204 * The STA is in power save mode, so assume
205 * that this TX packet failed because of that.
206 */
207 ieee80211_handle_filtered_frame(local, sta, skb);
208 rcu_read_unlock();
209 return;
210 }
211
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300212 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
213 (rates_idx != -1))
214 sta->last_tx_rate = info->status.rates[rates_idx];
215
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100216 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
217 (ieee80211_is_data_qos(fc))) {
218 u16 tid, ssn;
219 u8 *qc;
220
221 qc = ieee80211_get_qos_ctl(hdr);
222 tid = qc[0] & 0xf;
223 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
224 & IEEE80211_SCTL_SEQ);
225 ieee80211_send_bar(sta->sdata, hdr->addr1,
226 tid, ssn);
227 }
228
229 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
230 ieee80211_handle_filtered_frame(local, sta, skb);
231 rcu_read_unlock();
232 return;
233 } else {
234 if (!(info->flags & IEEE80211_TX_STAT_ACK))
235 sta->tx_retry_failed++;
236 sta->tx_retry_count += retry_count;
237 }
238
239 rate_control_tx_status(local, sband, sta, skb);
240 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
241 ieee80211s_update_metric(local, sta, skb);
Johannes Berg0f782312009-12-01 13:37:02 +0100242
243 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
244 (info->flags & IEEE80211_TX_STAT_ACK))
245 ieee80211_frame_acked(sta, skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100246 }
247
248 rcu_read_unlock();
249
250 ieee80211_led_tx(local, 0);
251
252 /* SNMP counters
253 * Fragments are passed to low-level drivers as separate skbs, so these
254 * are actually fragments, not frames. Update frame counters only for
255 * the first fragment of the frame. */
256
257 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
258 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
259
260 if (info->flags & IEEE80211_TX_STAT_ACK) {
261 if (frag == 0) {
262 local->dot11TransmittedFrameCount++;
263 if (is_multicast_ether_addr(hdr->addr1))
264 local->dot11MulticastTransmittedFrameCount++;
265 if (retry_count > 0)
266 local->dot11RetryCount++;
267 if (retry_count > 1)
268 local->dot11MultipleRetryCount++;
269 }
270
271 /* This counter shall be incremented for an acknowledged MPDU
272 * with an individual address in the address 1 field or an MPDU
273 * with a multicast address in the address 1 field of type Data
274 * or Management. */
275 if (!is_multicast_ether_addr(hdr->addr1) ||
276 type == IEEE80211_FTYPE_DATA ||
277 type == IEEE80211_FTYPE_MGMT)
278 local->dot11TransmittedFragmentCount++;
279 } else {
280 if (frag == 0)
281 local->dot11FailedCount++;
282 }
283
Vivek Natarajan375177b2010-02-09 14:50:28 +0530284 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
285 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
286 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
287 local->ps_sdata && !(local->scanning)) {
288 if (info->flags & IEEE80211_TX_STAT_ACK) {
289 local->ps_sdata->u.mgd.flags |=
290 IEEE80211_STA_NULLFUNC_ACKED;
291 ieee80211_queue_work(&local->hw,
292 &local->dynamic_ps_enable_work);
293 } else
294 mod_timer(&local->dynamic_ps_timer, jiffies +
295 msecs_to_jiffies(10));
296 }
297
Jouni Malinen026331c2010-02-15 12:53:10 +0200298 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX)
Johannes Berg2e161f72010-08-12 15:38:38 +0200299 cfg80211_mgmt_tx_status(
Jouni Malinen026331c2010-02-15 12:53:10 +0200300 skb->dev, (unsigned long) skb, skb->data, skb->len,
301 !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
302
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100303 /* this was a transmitted frame, but now we want to reuse it */
304 skb_orphan(skb);
305
Felix Fietkaueaf55532010-03-11 16:28:24 +0100306 /* Need to make a copy before skb->cb gets cleared */
307 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
308 (type != IEEE80211_FTYPE_DATA);
309
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100310 /*
311 * This is a bit racy but we can avoid a lot of work
312 * with this test...
313 */
Felix Fietkaueaf55532010-03-11 16:28:24 +0100314 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100315 dev_kfree_skb(skb);
316 return;
317 }
318
319 /* send frame to monitor interfaces now */
320
321 if (skb_headroom(skb) < sizeof(*rthdr)) {
322 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
323 dev_kfree_skb(skb);
324 return;
325 }
326
327 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
328 skb_push(skb, sizeof(*rthdr));
329
330 memset(rthdr, 0, sizeof(*rthdr));
331 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
332 rthdr->hdr.it_present =
333 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
334 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
335 (1 << IEEE80211_RADIOTAP_RATE));
336
337 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
338 !is_multicast_ether_addr(hdr->addr1))
339 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
340
341 /*
342 * XXX: Once radiotap gets the bitmap reset thing the vendor
343 * extensions proposal contains, we can actually report
344 * the whole set of tries we did.
345 */
346 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
347 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
348 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
349 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
350 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
351 if (info->status.rates[0].idx >= 0 &&
352 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
353 rthdr->rate = sband->bitrates[
354 info->status.rates[0].idx].bitrate / 5;
355
356 /* for now report the total retry_count */
357 rthdr->data_retries = retry_count;
358
359 /* XXX: is this sufficient for BPF? */
360 skb_set_mac_header(skb, 0);
361 skb->ip_summed = CHECKSUM_UNNECESSARY;
362 skb->pkt_type = PACKET_OTHERHOST;
363 skb->protocol = htons(ETH_P_802_2);
364 memset(skb->cb, 0, sizeof(skb->cb));
365
366 rcu_read_lock();
367 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
368 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100369 if (!ieee80211_sdata_running(sdata))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100370 continue;
371
372 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
Felix Fietkaueaf55532010-03-11 16:28:24 +0100373 !send_to_cooked)
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100374 continue;
375
376 if (prev_dev) {
377 skb2 = skb_clone(skb, GFP_ATOMIC);
378 if (skb2) {
379 skb2->dev = prev_dev;
John W. Linville5ed3bc72010-06-24 14:38:30 -0400380 netif_receive_skb(skb2);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100381 }
382 }
383
384 prev_dev = sdata->dev;
385 }
386 }
387 if (prev_dev) {
388 skb->dev = prev_dev;
John W. Linville5ed3bc72010-06-24 14:38:30 -0400389 netif_receive_skb(skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100390 skb = NULL;
391 }
392 rcu_read_unlock();
393 dev_kfree_skb(skb);
394}
395EXPORT_SYMBOL(ieee80211_tx_status);