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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,
50 * we can definitely not rely on the 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;
Jouni Malinen914828f2009-11-29 14:29:42 +0200174 bool injected;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100175
176 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
177 /* the HW cannot have attempted that rate */
178 if (i >= hw->max_rates) {
179 info->status.rates[i].idx = -1;
180 info->status.rates[i].count = 0;
181 }
182
183 retry_count += info->status.rates[i].count;
184 }
185 if (retry_count < 0)
186 retry_count = 0;
187
188 rcu_read_lock();
189
190 sband = local->hw.wiphy->bands[info->band];
Vivek Natarajan375177b2010-02-09 14:50:28 +0530191 fc = hdr->frame_control;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100192
Johannes Bergabe60632009-11-25 17:46:18 +0100193 for_each_sta_info(local, hdr->addr1, sta, tmp) {
194 /* skip wrong virtual interface */
Johannes Berg47846c92009-11-25 17:46:19 +0100195 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
Johannes Bergabe60632009-11-25 17:46:18 +0100196 continue;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100197
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100198 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
199 test_sta_flags(sta, WLAN_STA_PS_STA)) {
200 /*
201 * The STA is in power save mode, so assume
202 * that this TX packet failed because of that.
203 */
204 ieee80211_handle_filtered_frame(local, sta, skb);
205 rcu_read_unlock();
206 return;
207 }
208
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100209 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
210 (ieee80211_is_data_qos(fc))) {
211 u16 tid, ssn;
212 u8 *qc;
213
214 qc = ieee80211_get_qos_ctl(hdr);
215 tid = qc[0] & 0xf;
216 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
217 & IEEE80211_SCTL_SEQ);
218 ieee80211_send_bar(sta->sdata, hdr->addr1,
219 tid, ssn);
220 }
221
222 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
223 ieee80211_handle_filtered_frame(local, sta, skb);
224 rcu_read_unlock();
225 return;
226 } else {
227 if (!(info->flags & IEEE80211_TX_STAT_ACK))
228 sta->tx_retry_failed++;
229 sta->tx_retry_count += retry_count;
230 }
231
232 rate_control_tx_status(local, sband, sta, skb);
233 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
234 ieee80211s_update_metric(local, sta, skb);
Johannes Berg0f782312009-12-01 13:37:02 +0100235
236 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
237 (info->flags & IEEE80211_TX_STAT_ACK))
238 ieee80211_frame_acked(sta, skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100239 }
240
241 rcu_read_unlock();
242
243 ieee80211_led_tx(local, 0);
244
245 /* SNMP counters
246 * Fragments are passed to low-level drivers as separate skbs, so these
247 * are actually fragments, not frames. Update frame counters only for
248 * the first fragment of the frame. */
249
250 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
251 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
252
253 if (info->flags & IEEE80211_TX_STAT_ACK) {
254 if (frag == 0) {
255 local->dot11TransmittedFrameCount++;
256 if (is_multicast_ether_addr(hdr->addr1))
257 local->dot11MulticastTransmittedFrameCount++;
258 if (retry_count > 0)
259 local->dot11RetryCount++;
260 if (retry_count > 1)
261 local->dot11MultipleRetryCount++;
262 }
263
264 /* This counter shall be incremented for an acknowledged MPDU
265 * with an individual address in the address 1 field or an MPDU
266 * with a multicast address in the address 1 field of type Data
267 * or Management. */
268 if (!is_multicast_ether_addr(hdr->addr1) ||
269 type == IEEE80211_FTYPE_DATA ||
270 type == IEEE80211_FTYPE_MGMT)
271 local->dot11TransmittedFragmentCount++;
272 } else {
273 if (frag == 0)
274 local->dot11FailedCount++;
275 }
276
Vivek Natarajan375177b2010-02-09 14:50:28 +0530277 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
278 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
279 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
280 local->ps_sdata && !(local->scanning)) {
281 if (info->flags & IEEE80211_TX_STAT_ACK) {
282 local->ps_sdata->u.mgd.flags |=
283 IEEE80211_STA_NULLFUNC_ACKED;
284 ieee80211_queue_work(&local->hw,
285 &local->dynamic_ps_enable_work);
286 } else
287 mod_timer(&local->dynamic_ps_timer, jiffies +
288 msecs_to_jiffies(10));
289 }
290
Jouni Malinen026331c2010-02-15 12:53:10 +0200291 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX)
292 cfg80211_action_tx_status(
293 skb->dev, (unsigned long) skb, skb->data, skb->len,
294 !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
295
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100296 /* this was a transmitted frame, but now we want to reuse it */
297 skb_orphan(skb);
298
299 /*
300 * This is a bit racy but we can avoid a lot of work
301 * with this test...
302 */
303 if (!local->monitors && !local->cooked_mntrs) {
304 dev_kfree_skb(skb);
305 return;
306 }
307
308 /* send frame to monitor interfaces now */
309
310 if (skb_headroom(skb) < sizeof(*rthdr)) {
311 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
312 dev_kfree_skb(skb);
313 return;
314 }
315
316 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
317 skb_push(skb, sizeof(*rthdr));
318
319 memset(rthdr, 0, sizeof(*rthdr));
320 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
321 rthdr->hdr.it_present =
322 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
323 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
324 (1 << IEEE80211_RADIOTAP_RATE));
325
326 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
327 !is_multicast_ether_addr(hdr->addr1))
328 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
329
330 /*
331 * XXX: Once radiotap gets the bitmap reset thing the vendor
332 * extensions proposal contains, we can actually report
333 * the whole set of tries we did.
334 */
335 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
336 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
337 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
338 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
339 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
340 if (info->status.rates[0].idx >= 0 &&
341 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
342 rthdr->rate = sband->bitrates[
343 info->status.rates[0].idx].bitrate / 5;
344
345 /* for now report the total retry_count */
346 rthdr->data_retries = retry_count;
347
Jouni Malinen914828f2009-11-29 14:29:42 +0200348 /* Need to make a copy before skb->cb gets cleared */
349 injected = !!(info->flags & IEEE80211_TX_CTL_INJECTED);
350
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100351 /* XXX: is this sufficient for BPF? */
352 skb_set_mac_header(skb, 0);
353 skb->ip_summed = CHECKSUM_UNNECESSARY;
354 skb->pkt_type = PACKET_OTHERHOST;
355 skb->protocol = htons(ETH_P_802_2);
356 memset(skb->cb, 0, sizeof(skb->cb));
357
358 rcu_read_lock();
359 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
360 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100361 if (!ieee80211_sdata_running(sdata))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100362 continue;
363
364 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
Jouni Malinen914828f2009-11-29 14:29:42 +0200365 !injected &&
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100366 (type == IEEE80211_FTYPE_DATA))
367 continue;
368
369 if (prev_dev) {
370 skb2 = skb_clone(skb, GFP_ATOMIC);
371 if (skb2) {
372 skb2->dev = prev_dev;
373 netif_rx(skb2);
374 }
375 }
376
377 prev_dev = sdata->dev;
378 }
379 }
380 if (prev_dev) {
381 skb->dev = prev_dev;
382 netif_rx(skb);
383 skb = NULL;
384 }
385 rcu_read_unlock();
386 dev_kfree_skb(skb);
387}
388EXPORT_SYMBOL(ieee80211_tx_status);