blob: 9e171b17827643c3443ff75c1e7b75765ba23efc [file] [log] [blame]
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>
5 * Copyright 2008-2009 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#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 /*
48 * XXX: This is temporary!
49 *
50 * The problem here is that when we get here, the driver will
51 * quite likely have pretty much overwritten info->control by
52 * using info->driver_data or info->rate_driver_data. Thus,
53 * when passing out the frame to the driver again, we would be
54 * passing completely bogus data since the driver would then
55 * expect a properly filled info->control. In mac80211 itself
56 * the same problem occurs, since we need info->control.vif
57 * internally.
58 *
59 * To fix this, we should send the frame through TX processing
60 * again. However, it's not that simple, since the frame will
61 * have been software-encrypted (if applicable) already, and
62 * encrypting it again doesn't do much good. So to properly do
63 * that, we not only have to skip the actual 'raw' encryption
64 * (key selection etc. still has to be done!) but also the
65 * sequence number assignment since that impacts the crypto
66 * encapsulation, of course.
67 *
68 * Hence, for now, fix the bug by just dropping the frame.
69 */
70 goto drop;
71
Johannes Berg697e6a02010-01-17 01:47:56 +010072 /*
73 * This skb 'survived' a round-trip through the driver, and
74 * hopefully the driver didn't mangle it too badly. However,
75 * we can definitely not rely on the the control information
76 * being correct. Clear it so we don't get junk there.
77 */
78 memset(&info->control, 0, sizeof(info->control));
79
Johannes Bergfe7a5d52009-11-18 18:42:47 +010080 sta->tx_filtered_count++;
81
82 /*
83 * Clear the TX filter mask for this STA when sending the next
84 * packet. If the STA went to power save mode, this will happen
85 * when it wakes up for the next time.
86 */
87 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
88
89 /*
90 * This code races in the following way:
91 *
92 * (1) STA sends frame indicating it will go to sleep and does so
93 * (2) hardware/firmware adds STA to filter list, passes frame up
94 * (3) hardware/firmware processes TX fifo and suppresses a frame
95 * (4) we get TX status before having processed the frame and
96 * knowing that the STA has gone to sleep.
97 *
98 * This is actually quite unlikely even when both those events are
99 * processed from interrupts coming in quickly after one another or
100 * even at the same time because we queue both TX status events and
101 * RX frames to be processed by a tasklet and process them in the
102 * same order that they were received or TX status last. Hence, there
103 * is no race as long as the frame RX is processed before the next TX
104 * status, which drivers can ensure, see below.
105 *
106 * Note that this can only happen if the hardware or firmware can
107 * actually add STAs to the filter list, if this is done by the
108 * driver in response to set_tim() (which will only reduce the race
109 * this whole filtering tries to solve, not completely solve it)
110 * this situation cannot happen.
111 *
112 * To completely solve this race drivers need to make sure that they
113 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
114 * functions and
115 * (b) always process RX events before TX status events if ordering
116 * can be unknown, for example with different interrupt status
117 * bits.
118 */
119 if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
120 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
121 skb_queue_tail(&sta->tx_filtered, skb);
122 return;
123 }
124
125 if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
126 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
127 /* Software retry the packet once */
128 info->flags |= IEEE80211_TX_INTFL_RETRIED;
129 ieee80211_add_pending_skb(local, skb);
130 return;
131 }
132
133 drop:
134#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
135 if (net_ratelimit())
136 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
137 "queue_len=%d PS=%d @%lu\n",
138 wiphy_name(local->hw.wiphy),
139 skb_queue_len(&sta->tx_filtered),
140 !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
141#endif
142 dev_kfree_skb(skb);
143}
144
Johannes Berg0f782312009-12-01 13:37:02 +0100145static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
146{
147 struct ieee80211_mgmt *mgmt = (void *) skb->data;
148 struct ieee80211_local *local = sta->local;
149 struct ieee80211_sub_if_data *sdata = sta->sdata;
150
151 if (ieee80211_is_action(mgmt->frame_control) &&
152 sdata->vif.type == NL80211_IFTYPE_STATION &&
153 mgmt->u.action.category == WLAN_CATEGORY_HT &&
154 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
155 /*
156 * This update looks racy, but isn't -- if we come
157 * here we've definitely got a station that we're
158 * talking to, and on a managed interface that can
159 * only be the AP. And the only other place updating
160 * this variable is before we're associated.
161 */
162 switch (mgmt->u.action.u.ht_smps.smps_control) {
163 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
164 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
165 break;
166 case WLAN_HT_SMPS_CONTROL_STATIC:
167 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
168 break;
169 case WLAN_HT_SMPS_CONTROL_DISABLED:
170 default: /* shouldn't happen since we don't send that */
171 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
172 break;
173 }
174
175 ieee80211_queue_work(&local->hw, &local->recalc_smps);
176 }
177}
178
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100179void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
180{
181 struct sk_buff *skb2;
182 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
183 struct ieee80211_local *local = hw_to_local(hw);
184 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
185 u16 frag, type;
186 __le16 fc;
187 struct ieee80211_supported_band *sband;
188 struct ieee80211_tx_status_rtap_hdr *rthdr;
189 struct ieee80211_sub_if_data *sdata;
190 struct net_device *prev_dev = NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100191 struct sta_info *sta, *tmp;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100192 int retry_count = -1, i;
Jouni Malinen914828f2009-11-29 14:29:42 +0200193 bool injected;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100194
195 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
196 /* the HW cannot have attempted that rate */
197 if (i >= hw->max_rates) {
198 info->status.rates[i].idx = -1;
199 info->status.rates[i].count = 0;
200 }
201
202 retry_count += info->status.rates[i].count;
203 }
204 if (retry_count < 0)
205 retry_count = 0;
206
207 rcu_read_lock();
208
209 sband = local->hw.wiphy->bands[info->band];
210
Johannes Bergabe60632009-11-25 17:46:18 +0100211 for_each_sta_info(local, hdr->addr1, sta, tmp) {
212 /* skip wrong virtual interface */
Johannes Berg47846c92009-11-25 17:46:19 +0100213 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
Johannes Bergabe60632009-11-25 17:46:18 +0100214 continue;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100215
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100216 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
217 test_sta_flags(sta, WLAN_STA_PS_STA)) {
218 /*
219 * The STA is in power save mode, so assume
220 * that this TX packet failed because of that.
221 */
222 ieee80211_handle_filtered_frame(local, sta, skb);
223 rcu_read_unlock();
224 return;
225 }
226
227 fc = hdr->frame_control;
228
229 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
230 (ieee80211_is_data_qos(fc))) {
231 u16 tid, ssn;
232 u8 *qc;
233
234 qc = ieee80211_get_qos_ctl(hdr);
235 tid = qc[0] & 0xf;
236 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
237 & IEEE80211_SCTL_SEQ);
238 ieee80211_send_bar(sta->sdata, hdr->addr1,
239 tid, ssn);
240 }
241
242 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
243 ieee80211_handle_filtered_frame(local, sta, skb);
244 rcu_read_unlock();
245 return;
246 } else {
247 if (!(info->flags & IEEE80211_TX_STAT_ACK))
248 sta->tx_retry_failed++;
249 sta->tx_retry_count += retry_count;
250 }
251
252 rate_control_tx_status(local, sband, sta, skb);
253 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
254 ieee80211s_update_metric(local, sta, skb);
Johannes Berg0f782312009-12-01 13:37:02 +0100255
256 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
257 (info->flags & IEEE80211_TX_STAT_ACK))
258 ieee80211_frame_acked(sta, skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100259 }
260
261 rcu_read_unlock();
262
263 ieee80211_led_tx(local, 0);
264
265 /* SNMP counters
266 * Fragments are passed to low-level drivers as separate skbs, so these
267 * are actually fragments, not frames. Update frame counters only for
268 * the first fragment of the frame. */
269
270 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
271 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
272
273 if (info->flags & IEEE80211_TX_STAT_ACK) {
274 if (frag == 0) {
275 local->dot11TransmittedFrameCount++;
276 if (is_multicast_ether_addr(hdr->addr1))
277 local->dot11MulticastTransmittedFrameCount++;
278 if (retry_count > 0)
279 local->dot11RetryCount++;
280 if (retry_count > 1)
281 local->dot11MultipleRetryCount++;
282 }
283
284 /* This counter shall be incremented for an acknowledged MPDU
285 * with an individual address in the address 1 field or an MPDU
286 * with a multicast address in the address 1 field of type Data
287 * or Management. */
288 if (!is_multicast_ether_addr(hdr->addr1) ||
289 type == IEEE80211_FTYPE_DATA ||
290 type == IEEE80211_FTYPE_MGMT)
291 local->dot11TransmittedFragmentCount++;
292 } else {
293 if (frag == 0)
294 local->dot11FailedCount++;
295 }
296
297 /* this was a transmitted frame, but now we want to reuse it */
298 skb_orphan(skb);
299
300 /*
301 * This is a bit racy but we can avoid a lot of work
302 * with this test...
303 */
304 if (!local->monitors && !local->cooked_mntrs) {
305 dev_kfree_skb(skb);
306 return;
307 }
308
309 /* send frame to monitor interfaces now */
310
311 if (skb_headroom(skb) < sizeof(*rthdr)) {
312 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
313 dev_kfree_skb(skb);
314 return;
315 }
316
317 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
318 skb_push(skb, sizeof(*rthdr));
319
320 memset(rthdr, 0, sizeof(*rthdr));
321 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
322 rthdr->hdr.it_present =
323 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
324 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
325 (1 << IEEE80211_RADIOTAP_RATE));
326
327 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
328 !is_multicast_ether_addr(hdr->addr1))
329 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
330
331 /*
332 * XXX: Once radiotap gets the bitmap reset thing the vendor
333 * extensions proposal contains, we can actually report
334 * the whole set of tries we did.
335 */
336 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
337 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
338 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
339 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
340 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
341 if (info->status.rates[0].idx >= 0 &&
342 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
343 rthdr->rate = sband->bitrates[
344 info->status.rates[0].idx].bitrate / 5;
345
346 /* for now report the total retry_count */
347 rthdr->data_retries = retry_count;
348
Jouni Malinen914828f2009-11-29 14:29:42 +0200349 /* Need to make a copy before skb->cb gets cleared */
350 injected = !!(info->flags & IEEE80211_TX_CTL_INJECTED);
351
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100352 /* XXX: is this sufficient for BPF? */
353 skb_set_mac_header(skb, 0);
354 skb->ip_summed = CHECKSUM_UNNECESSARY;
355 skb->pkt_type = PACKET_OTHERHOST;
356 skb->protocol = htons(ETH_P_802_2);
357 memset(skb->cb, 0, sizeof(skb->cb));
358
359 rcu_read_lock();
360 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
361 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100362 if (!ieee80211_sdata_running(sdata))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100363 continue;
364
365 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
Jouni Malinen914828f2009-11-29 14:29:42 +0200366 !injected &&
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100367 (type == IEEE80211_FTYPE_DATA))
368 continue;
369
370 if (prev_dev) {
371 skb2 = skb_clone(skb, GFP_ATOMIC);
372 if (skb2) {
373 skb2->dev = prev_dev;
374 netif_rx(skb2);
375 }
376 }
377
378 prev_dev = sdata->dev;
379 }
380 }
381 if (prev_dev) {
382 skb->dev = prev_dev;
383 netif_rx(skb);
384 skb = NULL;
385 }
386 rcu_read_unlock();
387 dev_kfree_skb(skb);
388}
389EXPORT_SYMBOL(ieee80211_tx_status);