status.c 18 KB

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  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 2008-2010 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. #include <net/mac80211.h>
  12. #include "ieee80211_i.h"
  13. #include "rate.h"
  14. #include "mesh.h"
  15. #include "led.h"
  16. #include "wme.h"
  17. void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  18. struct sk_buff *skb)
  19. {
  20. struct ieee80211_local *local = hw_to_local(hw);
  21. struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  22. int tmp;
  23. skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  24. skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  25. &local->skb_queue : &local->skb_queue_unreliable, skb);
  26. tmp = skb_queue_len(&local->skb_queue) +
  27. skb_queue_len(&local->skb_queue_unreliable);
  28. while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  29. (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  30. dev_kfree_skb_irq(skb);
  31. tmp--;
  32. I802_DEBUG_INC(local->tx_status_drop);
  33. }
  34. tasklet_schedule(&local->tasklet);
  35. }
  36. EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  37. static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  38. struct sta_info *sta,
  39. struct sk_buff *skb)
  40. {
  41. struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  42. struct ieee80211_hdr *hdr = (void *)skb->data;
  43. int ac;
  44. /*
  45. * This skb 'survived' a round-trip through the driver, and
  46. * hopefully the driver didn't mangle it too badly. However,
  47. * we can definitely not rely on the control information
  48. * being correct. Clear it so we don't get junk there, and
  49. * indicate that it needs new processing, but must not be
  50. * modified/encrypted again.
  51. */
  52. memset(&info->control, 0, sizeof(info->control));
  53. info->control.jiffies = jiffies;
  54. info->control.vif = &sta->sdata->vif;
  55. info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
  56. IEEE80211_TX_INTFL_RETRANSMISSION;
  57. info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  58. sta->tx_filtered_count++;
  59. /*
  60. * Clear more-data bit on filtered frames, it might be set
  61. * but later frames might time out so it might have to be
  62. * clear again ... It's all rather unlikely (this frame
  63. * should time out first, right?) but let's not confuse
  64. * peers unnecessarily.
  65. */
  66. if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  67. hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  68. if (ieee80211_is_data_qos(hdr->frame_control)) {
  69. u8 *p = ieee80211_get_qos_ctl(hdr);
  70. int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  71. /*
  72. * Clear EOSP if set, this could happen e.g.
  73. * if an absence period (us being a P2P GO)
  74. * shortens the SP.
  75. */
  76. if (*p & IEEE80211_QOS_CTL_EOSP)
  77. *p &= ~IEEE80211_QOS_CTL_EOSP;
  78. ac = ieee802_1d_to_ac[tid & 7];
  79. } else {
  80. ac = IEEE80211_AC_BE;
  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_flag(sta, WLAN_STA_CLEAR_PS_FILT);
  88. /*
  89. * This code races in the following way:
  90. *
  91. * (1) STA sends frame indicating it will go to sleep and does so
  92. * (2) hardware/firmware adds STA to filter list, passes frame up
  93. * (3) hardware/firmware processes TX fifo and suppresses a frame
  94. * (4) we get TX status before having processed the frame and
  95. * knowing that the STA has gone to sleep.
  96. *
  97. * This is actually quite unlikely even when both those events are
  98. * processed from interrupts coming in quickly after one another or
  99. * even at the same time because we queue both TX status events and
  100. * RX frames to be processed by a tasklet and process them in the
  101. * same order that they were received or TX status last. Hence, there
  102. * is no race as long as the frame RX is processed before the next TX
  103. * status, which drivers can ensure, see below.
  104. *
  105. * Note that this can only happen if the hardware or firmware can
  106. * actually add STAs to the filter list, if this is done by the
  107. * driver in response to set_tim() (which will only reduce the race
  108. * this whole filtering tries to solve, not completely solve it)
  109. * this situation cannot happen.
  110. *
  111. * To completely solve this race drivers need to make sure that they
  112. * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
  113. * functions and
  114. * (b) always process RX events before TX status events if ordering
  115. * can be unknown, for example with different interrupt status
  116. * bits.
  117. * (c) if PS mode transitions are manual (i.e. the flag
  118. * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
  119. * changes before calling TX status events if ordering can be
  120. * unknown.
  121. */
  122. if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
  123. skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
  124. skb_queue_tail(&sta->tx_filtered[ac], skb);
  125. sta_info_recalc_tim(sta);
  126. if (!timer_pending(&local->sta_cleanup))
  127. mod_timer(&local->sta_cleanup,
  128. round_jiffies(jiffies +
  129. STA_INFO_CLEANUP_INTERVAL));
  130. return;
  131. }
  132. if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
  133. !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
  134. /* Software retry the packet once */
  135. info->flags |= IEEE80211_TX_INTFL_RETRIED;
  136. ieee80211_add_pending_skb(local, skb);
  137. return;
  138. }
  139. #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  140. if (net_ratelimit())
  141. wiphy_debug(local->hw.wiphy,
  142. "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
  143. skb_queue_len(&sta->tx_filtered[ac]),
  144. !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
  145. #endif
  146. dev_kfree_skb(skb);
  147. }
  148. static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
  149. {
  150. struct tid_ampdu_tx *tid_tx;
  151. tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
  152. if (!tid_tx || !tid_tx->bar_pending)
  153. return;
  154. tid_tx->bar_pending = false;
  155. ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
  156. }
  157. static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
  158. {
  159. struct ieee80211_mgmt *mgmt = (void *) skb->data;
  160. struct ieee80211_local *local = sta->local;
  161. struct ieee80211_sub_if_data *sdata = sta->sdata;
  162. if (ieee80211_is_data_qos(mgmt->frame_control)) {
  163. struct ieee80211_hdr *hdr = (void *) skb->data;
  164. u8 *qc = ieee80211_get_qos_ctl(hdr);
  165. u16 tid = qc[0] & 0xf;
  166. ieee80211_check_pending_bar(sta, hdr->addr1, tid);
  167. }
  168. if (ieee80211_is_action(mgmt->frame_control) &&
  169. sdata->vif.type == NL80211_IFTYPE_STATION &&
  170. mgmt->u.action.category == WLAN_CATEGORY_HT &&
  171. mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
  172. /*
  173. * This update looks racy, but isn't -- if we come
  174. * here we've definitely got a station that we're
  175. * talking to, and on a managed interface that can
  176. * only be the AP. And the only other place updating
  177. * this variable is before we're associated.
  178. */
  179. switch (mgmt->u.action.u.ht_smps.smps_control) {
  180. case WLAN_HT_SMPS_CONTROL_DYNAMIC:
  181. sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
  182. break;
  183. case WLAN_HT_SMPS_CONTROL_STATIC:
  184. sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
  185. break;
  186. case WLAN_HT_SMPS_CONTROL_DISABLED:
  187. default: /* shouldn't happen since we don't send that */
  188. sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
  189. break;
  190. }
  191. ieee80211_queue_work(&local->hw, &local->recalc_smps);
  192. }
  193. }
  194. static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
  195. {
  196. struct tid_ampdu_tx *tid_tx;
  197. tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
  198. if (!tid_tx)
  199. return;
  200. tid_tx->failed_bar_ssn = ssn;
  201. tid_tx->bar_pending = true;
  202. }
  203. static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
  204. {
  205. int len = sizeof(struct ieee80211_radiotap_header);
  206. /* IEEE80211_RADIOTAP_RATE rate */
  207. if (info->status.rates[0].idx >= 0 &&
  208. !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
  209. len += 2;
  210. /* IEEE80211_RADIOTAP_TX_FLAGS */
  211. len += 2;
  212. /* IEEE80211_RADIOTAP_DATA_RETRIES */
  213. len += 1;
  214. /* IEEE80211_TX_RC_MCS */
  215. if (info->status.rates[0].idx >= 0 &&
  216. info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
  217. len += 3;
  218. return len;
  219. }
  220. static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band
  221. *sband, struct sk_buff *skb,
  222. int retry_count, int rtap_len)
  223. {
  224. struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  225. struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
  226. struct ieee80211_radiotap_header *rthdr;
  227. unsigned char *pos;
  228. __le16 txflags;
  229. rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
  230. memset(rthdr, 0, rtap_len);
  231. rthdr->it_len = cpu_to_le16(rtap_len);
  232. rthdr->it_present =
  233. cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
  234. (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
  235. pos = (unsigned char *)(rthdr + 1);
  236. /*
  237. * XXX: Once radiotap gets the bitmap reset thing the vendor
  238. * extensions proposal contains, we can actually report
  239. * the whole set of tries we did.
  240. */
  241. /* IEEE80211_RADIOTAP_RATE */
  242. if (info->status.rates[0].idx >= 0 &&
  243. !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
  244. rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
  245. *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5;
  246. /* padding for tx flags */
  247. pos += 2;
  248. }
  249. /* IEEE80211_RADIOTAP_TX_FLAGS */
  250. txflags = 0;
  251. if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
  252. !is_multicast_ether_addr(hdr->addr1))
  253. txflags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
  254. if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
  255. (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
  256. txflags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
  257. else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
  258. txflags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
  259. put_unaligned_le16(txflags, pos);
  260. pos += 2;
  261. /* IEEE80211_RADIOTAP_DATA_RETRIES */
  262. /* for now report the total retry_count */
  263. *pos = retry_count;
  264. pos++;
  265. /* IEEE80211_TX_RC_MCS */
  266. if (info->status.rates[0].idx >= 0 &&
  267. info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
  268. rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
  269. pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
  270. IEEE80211_RADIOTAP_MCS_HAVE_GI |
  271. IEEE80211_RADIOTAP_MCS_HAVE_BW;
  272. if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
  273. pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
  274. if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  275. pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
  276. if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
  277. pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
  278. pos[2] = info->status.rates[0].idx;
  279. pos += 3;
  280. }
  281. }
  282. /*
  283. * Use a static threshold for now, best value to be determined
  284. * by testing ...
  285. * Should it depend on:
  286. * - on # of retransmissions
  287. * - current throughput (higher value for higher tpt)?
  288. */
  289. #define STA_LOST_PKT_THRESHOLD 50
  290. void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
  291. {
  292. struct sk_buff *skb2;
  293. struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
  294. struct ieee80211_local *local = hw_to_local(hw);
  295. struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  296. u16 frag, type;
  297. __le16 fc;
  298. struct ieee80211_supported_band *sband;
  299. struct ieee80211_sub_if_data *sdata;
  300. struct net_device *prev_dev = NULL;
  301. struct sta_info *sta, *tmp;
  302. int retry_count = -1, i;
  303. int rates_idx = -1;
  304. bool send_to_cooked;
  305. bool acked;
  306. struct ieee80211_bar *bar;
  307. u16 tid;
  308. int rtap_len;
  309. for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
  310. if (info->status.rates[i].idx < 0) {
  311. break;
  312. } else if (i >= hw->max_report_rates) {
  313. /* the HW cannot have attempted that rate */
  314. info->status.rates[i].idx = -1;
  315. info->status.rates[i].count = 0;
  316. break;
  317. }
  318. retry_count += info->status.rates[i].count;
  319. }
  320. rates_idx = i - 1;
  321. if (retry_count < 0)
  322. retry_count = 0;
  323. rcu_read_lock();
  324. sband = local->hw.wiphy->bands[info->band];
  325. fc = hdr->frame_control;
  326. for_each_sta_info(local, hdr->addr1, sta, tmp) {
  327. /* skip wrong virtual interface */
  328. if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
  329. continue;
  330. if (info->flags & IEEE80211_TX_STATUS_EOSP)
  331. clear_sta_flag(sta, WLAN_STA_SP);
  332. acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
  333. if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
  334. /*
  335. * The STA is in power save mode, so assume
  336. * that this TX packet failed because of that.
  337. */
  338. ieee80211_handle_filtered_frame(local, sta, skb);
  339. rcu_read_unlock();
  340. return;
  341. }
  342. if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
  343. (rates_idx != -1))
  344. sta->last_tx_rate = info->status.rates[rates_idx];
  345. if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
  346. (ieee80211_is_data_qos(fc))) {
  347. u16 tid, ssn;
  348. u8 *qc;
  349. qc = ieee80211_get_qos_ctl(hdr);
  350. tid = qc[0] & 0xf;
  351. ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
  352. & IEEE80211_SCTL_SEQ);
  353. ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
  354. tid, ssn);
  355. }
  356. if (!acked && ieee80211_is_back_req(fc)) {
  357. u16 control;
  358. /*
  359. * BAR failed, store the last SSN and retry sending
  360. * the BAR when the next unicast transmission on the
  361. * same TID succeeds.
  362. */
  363. bar = (struct ieee80211_bar *) skb->data;
  364. control = le16_to_cpu(bar->control);
  365. if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
  366. u16 ssn = le16_to_cpu(bar->start_seq_num);
  367. tid = (control &
  368. IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
  369. IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
  370. ieee80211_set_bar_pending(sta, tid, ssn);
  371. }
  372. }
  373. if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
  374. ieee80211_handle_filtered_frame(local, sta, skb);
  375. rcu_read_unlock();
  376. return;
  377. } else {
  378. if (!acked)
  379. sta->tx_retry_failed++;
  380. sta->tx_retry_count += retry_count;
  381. }
  382. rate_control_tx_status(local, sband, sta, skb);
  383. if (ieee80211_vif_is_mesh(&sta->sdata->vif))
  384. ieee80211s_update_metric(local, sta, skb);
  385. if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
  386. ieee80211_frame_acked(sta, skb);
  387. if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
  388. (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
  389. ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
  390. if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
  391. if (info->flags & IEEE80211_TX_STAT_ACK) {
  392. if (sta->lost_packets)
  393. sta->lost_packets = 0;
  394. } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
  395. cfg80211_cqm_pktloss_notify(sta->sdata->dev,
  396. sta->sta.addr,
  397. sta->lost_packets,
  398. GFP_ATOMIC);
  399. sta->lost_packets = 0;
  400. }
  401. }
  402. }
  403. rcu_read_unlock();
  404. ieee80211_led_tx(local, 0);
  405. /* SNMP counters
  406. * Fragments are passed to low-level drivers as separate skbs, so these
  407. * are actually fragments, not frames. Update frame counters only for
  408. * the first fragment of the frame. */
  409. frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
  410. type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
  411. if (info->flags & IEEE80211_TX_STAT_ACK) {
  412. if (frag == 0) {
  413. local->dot11TransmittedFrameCount++;
  414. if (is_multicast_ether_addr(hdr->addr1))
  415. local->dot11MulticastTransmittedFrameCount++;
  416. if (retry_count > 0)
  417. local->dot11RetryCount++;
  418. if (retry_count > 1)
  419. local->dot11MultipleRetryCount++;
  420. }
  421. /* This counter shall be incremented for an acknowledged MPDU
  422. * with an individual address in the address 1 field or an MPDU
  423. * with a multicast address in the address 1 field of type Data
  424. * or Management. */
  425. if (!is_multicast_ether_addr(hdr->addr1) ||
  426. type == IEEE80211_FTYPE_DATA ||
  427. type == IEEE80211_FTYPE_MGMT)
  428. local->dot11TransmittedFragmentCount++;
  429. } else {
  430. if (frag == 0)
  431. local->dot11FailedCount++;
  432. }
  433. if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
  434. (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
  435. !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
  436. local->ps_sdata && !(local->scanning)) {
  437. if (info->flags & IEEE80211_TX_STAT_ACK) {
  438. local->ps_sdata->u.mgd.flags |=
  439. IEEE80211_STA_NULLFUNC_ACKED;
  440. } else
  441. mod_timer(&local->dynamic_ps_timer, jiffies +
  442. msecs_to_jiffies(10));
  443. }
  444. if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
  445. struct ieee80211_work *wk;
  446. u64 cookie = (unsigned long)skb;
  447. rcu_read_lock();
  448. list_for_each_entry_rcu(wk, &local->work_list, list) {
  449. if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
  450. continue;
  451. if (wk->offchan_tx.frame != skb)
  452. continue;
  453. wk->offchan_tx.status = true;
  454. break;
  455. }
  456. rcu_read_unlock();
  457. if (local->hw_roc_skb_for_status == skb) {
  458. cookie = local->hw_roc_cookie ^ 2;
  459. local->hw_roc_skb_for_status = NULL;
  460. }
  461. cfg80211_mgmt_tx_status(
  462. skb->dev, cookie, skb->data, skb->len,
  463. !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
  464. }
  465. /* this was a transmitted frame, but now we want to reuse it */
  466. skb_orphan(skb);
  467. /* Need to make a copy before skb->cb gets cleared */
  468. send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
  469. (type != IEEE80211_FTYPE_DATA);
  470. /*
  471. * This is a bit racy but we can avoid a lot of work
  472. * with this test...
  473. */
  474. if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
  475. dev_kfree_skb(skb);
  476. return;
  477. }
  478. /* send frame to monitor interfaces now */
  479. rtap_len = ieee80211_tx_radiotap_len(info);
  480. if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
  481. printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
  482. dev_kfree_skb(skb);
  483. return;
  484. }
  485. ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);
  486. /* XXX: is this sufficient for BPF? */
  487. skb_set_mac_header(skb, 0);
  488. skb->ip_summed = CHECKSUM_UNNECESSARY;
  489. skb->pkt_type = PACKET_OTHERHOST;
  490. skb->protocol = htons(ETH_P_802_2);
  491. memset(skb->cb, 0, sizeof(skb->cb));
  492. rcu_read_lock();
  493. list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  494. if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
  495. if (!ieee80211_sdata_running(sdata))
  496. continue;
  497. if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
  498. !send_to_cooked)
  499. continue;
  500. if (prev_dev) {
  501. skb2 = skb_clone(skb, GFP_ATOMIC);
  502. if (skb2) {
  503. skb2->dev = prev_dev;
  504. netif_rx(skb2);
  505. }
  506. }
  507. prev_dev = sdata->dev;
  508. }
  509. }
  510. if (prev_dev) {
  511. skb->dev = prev_dev;
  512. netif_rx(skb);
  513. skb = NULL;
  514. }
  515. rcu_read_unlock();
  516. dev_kfree_skb(skb);
  517. }
  518. EXPORT_SYMBOL(ieee80211_tx_status);
  519. void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
  520. {
  521. struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
  522. cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
  523. num_packets, GFP_ATOMIC);
  524. }
  525. EXPORT_SYMBOL(ieee80211_report_low_ack);