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fe7a5d5c JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
026331c4 | 5 | * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net> |
fe7a5d5c JB |
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 | ||
19 | void 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 | } | |
39 | EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); | |
40 | ||
41 | static 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 | ||
697e6a0f JB |
47 | /* |
48 | * This skb 'survived' a round-trip through the driver, and | |
49 | * hopefully the driver didn't mangle it too badly. However, | |
77c2061d | 50 | * we can definitely not rely on the control information |
c6fcf6bc JB |
51 | * 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. | |
697e6a0f JB |
54 | */ |
55 | memset(&info->control, 0, sizeof(info->control)); | |
18c94907 JB |
56 | |
57 | info->control.jiffies = jiffies; | |
58 | info->control.vif = &sta->sdata->vif; | |
c6fcf6bc JB |
59 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | |
60 | IEEE80211_TX_INTFL_RETRANSMISSION; | |
697e6a0f | 61 | |
fe7a5d5c JB |
62 | 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 | ||
fe7a5d5c JB |
115 | #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 | ||
0f78231b JB |
126 | static 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 | ||
fe7a5d5c JB |
160 | void 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; | |
abe60632 | 172 | struct sta_info *sta, *tmp; |
fe7a5d5c | 173 | int retry_count = -1, i; |
0c869808 | 174 | int rates_idx = -1; |
eaf55530 | 175 | bool send_to_cooked; |
fe7a5d5c JB |
176 | |
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; | |
0c869808 JO |
182 | } else if (info->status.rates[i].idx >= 0) { |
183 | rates_idx = i; | |
fe7a5d5c JB |
184 | } |
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]; | |
375177bf | 194 | fc = hdr->frame_control; |
fe7a5d5c | 195 | |
abe60632 JB |
196 | for_each_sta_info(local, hdr->addr1, sta, tmp) { |
197 | /* skip wrong virtual interface */ | |
47846c9b | 198 | if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN)) |
abe60632 | 199 | continue; |
fe7a5d5c | 200 | |
fe7a5d5c JB |
201 | 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 | ||
0c869808 JO |
212 | if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && |
213 | (rates_idx != -1)) | |
214 | sta->last_tx_rate = info->status.rates[rates_idx]; | |
215 | ||
fe7a5d5c JB |
216 | 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); | |
0f78231b JB |
242 | |
243 | if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && | |
244 | (info->flags & IEEE80211_TX_STAT_ACK)) | |
245 | ieee80211_frame_acked(sta, skb); | |
fe7a5d5c JB |
246 | } |
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 | ||
375177bf VN |
284 | 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 | ||
026331c4 JM |
298 | if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) |
299 | cfg80211_action_tx_status( | |
300 | skb->dev, (unsigned long) skb, skb->data, skb->len, | |
301 | !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC); | |
302 | ||
fe7a5d5c JB |
303 | /* this was a transmitted frame, but now we want to reuse it */ |
304 | skb_orphan(skb); | |
305 | ||
eaf55530 FF |
306 | /* 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 | ||
fe7a5d5c JB |
310 | /* |
311 | * This is a bit racy but we can avoid a lot of work | |
312 | * with this test... | |
313 | */ | |
eaf55530 | 314 | if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { |
fe7a5d5c JB |
315 | 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) { | |
9607e6b6 | 369 | if (!ieee80211_sdata_running(sdata)) |
fe7a5d5c JB |
370 | continue; |
371 | ||
372 | if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && | |
eaf55530 | 373 | !send_to_cooked) |
fe7a5d5c JB |
374 | continue; |
375 | ||
376 | if (prev_dev) { | |
377 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
378 | if (skb2) { | |
379 | skb2->dev = prev_dev; | |
5ed3bc72 | 380 | netif_receive_skb(skb2); |
fe7a5d5c JB |
381 | } |
382 | } | |
383 | ||
384 | prev_dev = sdata->dev; | |
385 | } | |
386 | } | |
387 | if (prev_dev) { | |
388 | skb->dev = prev_dev; | |
5ed3bc72 | 389 | netif_receive_skb(skb); |
fe7a5d5c JB |
390 | skb = NULL; |
391 | } | |
392 | rcu_read_unlock(); | |
393 | dev_kfree_skb(skb); | |
394 | } | |
395 | EXPORT_SYMBOL(ieee80211_tx_status); |