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