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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> | |
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 | ||
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, | |
50 | * we can definitely not rely on the 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)); | |
c6fcf6bc JB |
56 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | |
57 | IEEE80211_TX_INTFL_RETRANSMISSION; | |
697e6a0f | 58 | |
fe7a5d5c JB |
59 | sta->tx_filtered_count++; |
60 | ||
61 | /* | |
62 | * Clear the TX filter mask for this STA when sending the next | |
63 | * packet. If the STA went to power save mode, this will happen | |
64 | * when it wakes up for the next time. | |
65 | */ | |
66 | set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); | |
67 | ||
68 | /* | |
69 | * This code races in the following way: | |
70 | * | |
71 | * (1) STA sends frame indicating it will go to sleep and does so | |
72 | * (2) hardware/firmware adds STA to filter list, passes frame up | |
73 | * (3) hardware/firmware processes TX fifo and suppresses a frame | |
74 | * (4) we get TX status before having processed the frame and | |
75 | * knowing that the STA has gone to sleep. | |
76 | * | |
77 | * This is actually quite unlikely even when both those events are | |
78 | * processed from interrupts coming in quickly after one another or | |
79 | * even at the same time because we queue both TX status events and | |
80 | * RX frames to be processed by a tasklet and process them in the | |
81 | * same order that they were received or TX status last. Hence, there | |
82 | * is no race as long as the frame RX is processed before the next TX | |
83 | * status, which drivers can ensure, see below. | |
84 | * | |
85 | * Note that this can only happen if the hardware or firmware can | |
86 | * actually add STAs to the filter list, if this is done by the | |
87 | * driver in response to set_tim() (which will only reduce the race | |
88 | * this whole filtering tries to solve, not completely solve it) | |
89 | * this situation cannot happen. | |
90 | * | |
91 | * To completely solve this race drivers need to make sure that they | |
92 | * (a) don't mix the irq-safe/not irq-safe TX status/RX processing | |
93 | * functions and | |
94 | * (b) always process RX events before TX status events if ordering | |
95 | * can be unknown, for example with different interrupt status | |
96 | * bits. | |
97 | */ | |
98 | if (test_sta_flags(sta, WLAN_STA_PS_STA) && | |
99 | skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { | |
100 | skb_queue_tail(&sta->tx_filtered, skb); | |
101 | return; | |
102 | } | |
103 | ||
104 | if (!test_sta_flags(sta, WLAN_STA_PS_STA) && | |
105 | !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { | |
106 | /* Software retry the packet once */ | |
107 | info->flags |= IEEE80211_TX_INTFL_RETRIED; | |
108 | ieee80211_add_pending_skb(local, skb); | |
109 | return; | |
110 | } | |
111 | ||
fe7a5d5c JB |
112 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
113 | if (net_ratelimit()) | |
114 | printk(KERN_DEBUG "%s: dropped TX filtered frame, " | |
115 | "queue_len=%d PS=%d @%lu\n", | |
116 | wiphy_name(local->hw.wiphy), | |
117 | skb_queue_len(&sta->tx_filtered), | |
118 | !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies); | |
119 | #endif | |
120 | dev_kfree_skb(skb); | |
121 | } | |
122 | ||
0f78231b JB |
123 | static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) |
124 | { | |
125 | struct ieee80211_mgmt *mgmt = (void *) skb->data; | |
126 | struct ieee80211_local *local = sta->local; | |
127 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
128 | ||
129 | if (ieee80211_is_action(mgmt->frame_control) && | |
130 | sdata->vif.type == NL80211_IFTYPE_STATION && | |
131 | mgmt->u.action.category == WLAN_CATEGORY_HT && | |
132 | mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) { | |
133 | /* | |
134 | * This update looks racy, but isn't -- if we come | |
135 | * here we've definitely got a station that we're | |
136 | * talking to, and on a managed interface that can | |
137 | * only be the AP. And the only other place updating | |
138 | * this variable is before we're associated. | |
139 | */ | |
140 | switch (mgmt->u.action.u.ht_smps.smps_control) { | |
141 | case WLAN_HT_SMPS_CONTROL_DYNAMIC: | |
142 | sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC; | |
143 | break; | |
144 | case WLAN_HT_SMPS_CONTROL_STATIC: | |
145 | sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC; | |
146 | break; | |
147 | case WLAN_HT_SMPS_CONTROL_DISABLED: | |
148 | default: /* shouldn't happen since we don't send that */ | |
149 | sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF; | |
150 | break; | |
151 | } | |
152 | ||
153 | ieee80211_queue_work(&local->hw, &local->recalc_smps); | |
154 | } | |
155 | } | |
156 | ||
fe7a5d5c JB |
157 | void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) |
158 | { | |
159 | struct sk_buff *skb2; | |
160 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
161 | struct ieee80211_local *local = hw_to_local(hw); | |
162 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
163 | u16 frag, type; | |
164 | __le16 fc; | |
165 | struct ieee80211_supported_band *sband; | |
166 | struct ieee80211_tx_status_rtap_hdr *rthdr; | |
167 | struct ieee80211_sub_if_data *sdata; | |
168 | struct net_device *prev_dev = NULL; | |
abe60632 | 169 | struct sta_info *sta, *tmp; |
fe7a5d5c | 170 | int retry_count = -1, i; |
914828fa | 171 | bool injected; |
fe7a5d5c JB |
172 | |
173 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { | |
174 | /* the HW cannot have attempted that rate */ | |
175 | if (i >= hw->max_rates) { | |
176 | info->status.rates[i].idx = -1; | |
177 | info->status.rates[i].count = 0; | |
178 | } | |
179 | ||
180 | retry_count += info->status.rates[i].count; | |
181 | } | |
182 | if (retry_count < 0) | |
183 | retry_count = 0; | |
184 | ||
185 | rcu_read_lock(); | |
186 | ||
187 | sband = local->hw.wiphy->bands[info->band]; | |
188 | ||
abe60632 JB |
189 | for_each_sta_info(local, hdr->addr1, sta, tmp) { |
190 | /* skip wrong virtual interface */ | |
47846c9b | 191 | if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN)) |
abe60632 | 192 | continue; |
fe7a5d5c | 193 | |
fe7a5d5c JB |
194 | if (!(info->flags & IEEE80211_TX_STAT_ACK) && |
195 | test_sta_flags(sta, WLAN_STA_PS_STA)) { | |
196 | /* | |
197 | * The STA is in power save mode, so assume | |
198 | * that this TX packet failed because of that. | |
199 | */ | |
200 | ieee80211_handle_filtered_frame(local, sta, skb); | |
201 | rcu_read_unlock(); | |
202 | return; | |
203 | } | |
204 | ||
205 | fc = hdr->frame_control; | |
206 | ||
207 | if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && | |
208 | (ieee80211_is_data_qos(fc))) { | |
209 | u16 tid, ssn; | |
210 | u8 *qc; | |
211 | ||
212 | qc = ieee80211_get_qos_ctl(hdr); | |
213 | tid = qc[0] & 0xf; | |
214 | ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) | |
215 | & IEEE80211_SCTL_SEQ); | |
216 | ieee80211_send_bar(sta->sdata, hdr->addr1, | |
217 | tid, ssn); | |
218 | } | |
219 | ||
220 | if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { | |
221 | ieee80211_handle_filtered_frame(local, sta, skb); | |
222 | rcu_read_unlock(); | |
223 | return; | |
224 | } else { | |
225 | if (!(info->flags & IEEE80211_TX_STAT_ACK)) | |
226 | sta->tx_retry_failed++; | |
227 | sta->tx_retry_count += retry_count; | |
228 | } | |
229 | ||
230 | rate_control_tx_status(local, sband, sta, skb); | |
231 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) | |
232 | ieee80211s_update_metric(local, sta, skb); | |
0f78231b JB |
233 | |
234 | if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && | |
235 | (info->flags & IEEE80211_TX_STAT_ACK)) | |
236 | ieee80211_frame_acked(sta, skb); | |
fe7a5d5c JB |
237 | } |
238 | ||
239 | rcu_read_unlock(); | |
240 | ||
241 | ieee80211_led_tx(local, 0); | |
242 | ||
243 | /* SNMP counters | |
244 | * Fragments are passed to low-level drivers as separate skbs, so these | |
245 | * are actually fragments, not frames. Update frame counters only for | |
246 | * the first fragment of the frame. */ | |
247 | ||
248 | frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; | |
249 | type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; | |
250 | ||
251 | if (info->flags & IEEE80211_TX_STAT_ACK) { | |
252 | if (frag == 0) { | |
253 | local->dot11TransmittedFrameCount++; | |
254 | if (is_multicast_ether_addr(hdr->addr1)) | |
255 | local->dot11MulticastTransmittedFrameCount++; | |
256 | if (retry_count > 0) | |
257 | local->dot11RetryCount++; | |
258 | if (retry_count > 1) | |
259 | local->dot11MultipleRetryCount++; | |
260 | } | |
261 | ||
262 | /* This counter shall be incremented for an acknowledged MPDU | |
263 | * with an individual address in the address 1 field or an MPDU | |
264 | * with a multicast address in the address 1 field of type Data | |
265 | * or Management. */ | |
266 | if (!is_multicast_ether_addr(hdr->addr1) || | |
267 | type == IEEE80211_FTYPE_DATA || | |
268 | type == IEEE80211_FTYPE_MGMT) | |
269 | local->dot11TransmittedFragmentCount++; | |
270 | } else { | |
271 | if (frag == 0) | |
272 | local->dot11FailedCount++; | |
273 | } | |
274 | ||
275 | /* this was a transmitted frame, but now we want to reuse it */ | |
276 | skb_orphan(skb); | |
277 | ||
278 | /* | |
279 | * This is a bit racy but we can avoid a lot of work | |
280 | * with this test... | |
281 | */ | |
282 | if (!local->monitors && !local->cooked_mntrs) { | |
283 | dev_kfree_skb(skb); | |
284 | return; | |
285 | } | |
286 | ||
287 | /* send frame to monitor interfaces now */ | |
288 | ||
289 | if (skb_headroom(skb) < sizeof(*rthdr)) { | |
290 | printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); | |
291 | dev_kfree_skb(skb); | |
292 | return; | |
293 | } | |
294 | ||
295 | rthdr = (struct ieee80211_tx_status_rtap_hdr *) | |
296 | skb_push(skb, sizeof(*rthdr)); | |
297 | ||
298 | memset(rthdr, 0, sizeof(*rthdr)); | |
299 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
300 | rthdr->hdr.it_present = | |
301 | cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | | |
302 | (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | | |
303 | (1 << IEEE80211_RADIOTAP_RATE)); | |
304 | ||
305 | if (!(info->flags & IEEE80211_TX_STAT_ACK) && | |
306 | !is_multicast_ether_addr(hdr->addr1)) | |
307 | rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); | |
308 | ||
309 | /* | |
310 | * XXX: Once radiotap gets the bitmap reset thing the vendor | |
311 | * extensions proposal contains, we can actually report | |
312 | * the whole set of tries we did. | |
313 | */ | |
314 | if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || | |
315 | (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) | |
316 | rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); | |
317 | else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) | |
318 | rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); | |
319 | if (info->status.rates[0].idx >= 0 && | |
320 | !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) | |
321 | rthdr->rate = sband->bitrates[ | |
322 | info->status.rates[0].idx].bitrate / 5; | |
323 | ||
324 | /* for now report the total retry_count */ | |
325 | rthdr->data_retries = retry_count; | |
326 | ||
914828fa JM |
327 | /* Need to make a copy before skb->cb gets cleared */ |
328 | injected = !!(info->flags & IEEE80211_TX_CTL_INJECTED); | |
329 | ||
fe7a5d5c JB |
330 | /* XXX: is this sufficient for BPF? */ |
331 | skb_set_mac_header(skb, 0); | |
332 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
333 | skb->pkt_type = PACKET_OTHERHOST; | |
334 | skb->protocol = htons(ETH_P_802_2); | |
335 | memset(skb->cb, 0, sizeof(skb->cb)); | |
336 | ||
337 | rcu_read_lock(); | |
338 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
339 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { | |
9607e6b6 | 340 | if (!ieee80211_sdata_running(sdata)) |
fe7a5d5c JB |
341 | continue; |
342 | ||
343 | if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && | |
914828fa | 344 | !injected && |
fe7a5d5c JB |
345 | (type == IEEE80211_FTYPE_DATA)) |
346 | continue; | |
347 | ||
348 | if (prev_dev) { | |
349 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
350 | if (skb2) { | |
351 | skb2->dev = prev_dev; | |
352 | netif_rx(skb2); | |
353 | } | |
354 | } | |
355 | ||
356 | prev_dev = sdata->dev; | |
357 | } | |
358 | } | |
359 | if (prev_dev) { | |
360 | skb->dev = prev_dev; | |
361 | netif_rx(skb); | |
362 | skb = NULL; | |
363 | } | |
364 | rcu_read_unlock(); | |
365 | dev_kfree_skb(skb); | |
366 | } | |
367 | EXPORT_SYMBOL(ieee80211_tx_status); |