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 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 * 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 control information 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. 54 */ 55 memset(&info->control, 0, sizeof(info->control)); 56 57 info->control.jiffies = jiffies; 58 info->control.vif = &sta->sdata->vif; 59 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 60 IEEE80211_TX_INTFL_RETRANSMISSION; 61 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 62 63 sta->tx_filtered_count++; 64 65 /* 66 * Clear the TX filter mask for this STA when sending the next 67 * packet. If the STA went to power save mode, this will happen 68 * when it wakes up for the next time. 69 */ 70 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 71 72 /* 73 * This code races in the following way: 74 * 75 * (1) STA sends frame indicating it will go to sleep and does so 76 * (2) hardware/firmware adds STA to filter list, passes frame up 77 * (3) hardware/firmware processes TX fifo and suppresses a frame 78 * (4) we get TX status before having processed the frame and 79 * knowing that the STA has gone to sleep. 80 * 81 * This is actually quite unlikely even when both those events are 82 * processed from interrupts coming in quickly after one another or 83 * even at the same time because we queue both TX status events and 84 * RX frames to be processed by a tasklet and process them in the 85 * same order that they were received or TX status last. Hence, there 86 * is no race as long as the frame RX is processed before the next TX 87 * status, which drivers can ensure, see below. 88 * 89 * Note that this can only happen if the hardware or firmware can 90 * actually add STAs to the filter list, if this is done by the 91 * driver in response to set_tim() (which will only reduce the race 92 * this whole filtering tries to solve, not completely solve it) 93 * this situation cannot happen. 94 * 95 * To completely solve this race drivers need to make sure that they 96 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 97 * functions and 98 * (b) always process RX events before TX status events if ordering 99 * can be unknown, for example with different interrupt status 100 * bits. 101 */ 102 if (test_sta_flags(sta, WLAN_STA_PS_STA) && 103 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 104 skb_queue_tail(&sta->tx_filtered, skb); 105 return; 106 } 107 108 if (!test_sta_flags(sta, WLAN_STA_PS_STA) && 109 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 110 /* Software retry the packet once */ 111 info->flags |= IEEE80211_TX_INTFL_RETRIED; 112 ieee80211_add_pending_skb(local, skb); 113 return; 114 } 115 116#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 117 if (net_ratelimit()) 118 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 119 "queue_len=%d PS=%d @%lu\n", 120 wiphy_name(local->hw.wiphy), 121 skb_queue_len(&sta->tx_filtered), 122 !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies); 123#endif 124 dev_kfree_skb(skb); 125} 126 127static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 128{ 129 struct ieee80211_mgmt *mgmt = (void *) skb->data; 130 struct ieee80211_local *local = sta->local; 131 struct ieee80211_sub_if_data *sdata = sta->sdata; 132 133 if (ieee80211_is_action(mgmt->frame_control) && 134 sdata->vif.type == NL80211_IFTYPE_STATION && 135 mgmt->u.action.category == WLAN_CATEGORY_HT && 136 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) { 137 /* 138 * This update looks racy, but isn't -- if we come 139 * here we've definitely got a station that we're 140 * talking to, and on a managed interface that can 141 * only be the AP. And the only other place updating 142 * this variable is before we're associated. 143 */ 144 switch (mgmt->u.action.u.ht_smps.smps_control) { 145 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 146 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC; 147 break; 148 case WLAN_HT_SMPS_CONTROL_STATIC: 149 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC; 150 break; 151 case WLAN_HT_SMPS_CONTROL_DISABLED: 152 default: /* shouldn't happen since we don't send that */ 153 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF; 154 break; 155 } 156 157 ieee80211_queue_work(&local->hw, &local->recalc_smps); 158 } 159} 160 161void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 162{ 163 struct sk_buff *skb2; 164 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 165 struct ieee80211_local *local = hw_to_local(hw); 166 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 167 u16 frag, type; 168 __le16 fc; 169 struct ieee80211_supported_band *sband; 170 struct ieee80211_tx_status_rtap_hdr *rthdr; 171 struct ieee80211_sub_if_data *sdata; 172 struct net_device *prev_dev = NULL; 173 struct sta_info *sta, *tmp; 174 int retry_count = -1, i; 175 int rates_idx = -1; 176 bool send_to_cooked; 177 178 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 179 /* the HW cannot have attempted that rate */ 180 if (i >= hw->max_rates) { 181 info->status.rates[i].idx = -1; 182 info->status.rates[i].count = 0; 183 } else if (info->status.rates[i].idx >= 0) { 184 rates_idx = i; 185 } 186 187 retry_count += info->status.rates[i].count; 188 } 189 if (retry_count < 0) 190 retry_count = 0; 191 192 rcu_read_lock(); 193 194 sband = local->hw.wiphy->bands[info->band]; 195 fc = hdr->frame_control; 196 197 for_each_sta_info(local, hdr->addr1, sta, tmp) { 198 /* skip wrong virtual interface */ 199 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN)) 200 continue; 201 202 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 203 test_sta_flags(sta, WLAN_STA_PS_STA)) { 204 /* 205 * The STA is in power save mode, so assume 206 * that this TX packet failed because of that. 207 */ 208 ieee80211_handle_filtered_frame(local, sta, skb); 209 rcu_read_unlock(); 210 return; 211 } 212 213 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 214 (rates_idx != -1)) 215 sta->last_tx_rate = info->status.rates[rates_idx]; 216 217 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 218 (ieee80211_is_data_qos(fc))) { 219 u16 tid, ssn; 220 u8 *qc; 221 222 qc = ieee80211_get_qos_ctl(hdr); 223 tid = qc[0] & 0xf; 224 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 225 & IEEE80211_SCTL_SEQ); 226 ieee80211_send_bar(sta->sdata, hdr->addr1, 227 tid, ssn); 228 } 229 230 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 231 ieee80211_handle_filtered_frame(local, sta, skb); 232 rcu_read_unlock(); 233 return; 234 } else { 235 if (!(info->flags & IEEE80211_TX_STAT_ACK)) 236 sta->tx_retry_failed++; 237 sta->tx_retry_count += retry_count; 238 } 239 240 rate_control_tx_status(local, sband, sta, skb); 241 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 242 ieee80211s_update_metric(local, sta, skb); 243 244 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && 245 (info->flags & IEEE80211_TX_STAT_ACK)) 246 ieee80211_frame_acked(sta, skb); 247 } 248 249 rcu_read_unlock(); 250 251 ieee80211_led_tx(local, 0); 252 253 /* SNMP counters 254 * Fragments are passed to low-level drivers as separate skbs, so these 255 * are actually fragments, not frames. Update frame counters only for 256 * the first fragment of the frame. */ 257 258 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 259 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 260 261 if (info->flags & IEEE80211_TX_STAT_ACK) { 262 if (frag == 0) { 263 local->dot11TransmittedFrameCount++; 264 if (is_multicast_ether_addr(hdr->addr1)) 265 local->dot11MulticastTransmittedFrameCount++; 266 if (retry_count > 0) 267 local->dot11RetryCount++; 268 if (retry_count > 1) 269 local->dot11MultipleRetryCount++; 270 } 271 272 /* This counter shall be incremented for an acknowledged MPDU 273 * with an individual address in the address 1 field or an MPDU 274 * with a multicast address in the address 1 field of type Data 275 * or Management. */ 276 if (!is_multicast_ether_addr(hdr->addr1) || 277 type == IEEE80211_FTYPE_DATA || 278 type == IEEE80211_FTYPE_MGMT) 279 local->dot11TransmittedFragmentCount++; 280 } else { 281 if (frag == 0) 282 local->dot11FailedCount++; 283 } 284 285 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 286 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 287 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 288 local->ps_sdata && !(local->scanning)) { 289 if (info->flags & IEEE80211_TX_STAT_ACK) { 290 local->ps_sdata->u.mgd.flags |= 291 IEEE80211_STA_NULLFUNC_ACKED; 292 ieee80211_queue_work(&local->hw, 293 &local->dynamic_ps_enable_work); 294 } else 295 mod_timer(&local->dynamic_ps_timer, jiffies + 296 msecs_to_jiffies(10)); 297 } 298 299 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) 300 cfg80211_action_tx_status( 301 skb->dev, (unsigned long) skb, skb->data, skb->len, 302 !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC); 303 304 /* this was a transmitted frame, but now we want to reuse it */ 305 skb_orphan(skb); 306 307 /* Need to make a copy before skb->cb gets cleared */ 308 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 309 (type != IEEE80211_FTYPE_DATA); 310 311 /* 312 * This is a bit racy but we can avoid a lot of work 313 * with this test... 314 */ 315 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 316 dev_kfree_skb(skb); 317 return; 318 } 319 320 /* send frame to monitor interfaces now */ 321 322 if (skb_headroom(skb) < sizeof(*rthdr)) { 323 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 324 dev_kfree_skb(skb); 325 return; 326 } 327 328 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 329 skb_push(skb, sizeof(*rthdr)); 330 331 memset(rthdr, 0, sizeof(*rthdr)); 332 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 333 rthdr->hdr.it_present = 334 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 335 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | 336 (1 << IEEE80211_RADIOTAP_RATE)); 337 338 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 339 !is_multicast_ether_addr(hdr->addr1)) 340 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 341 342 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 343 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 344 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 345 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 346 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 347 if (info->status.rates[0].idx >= 0 && 348 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 349 rthdr->rate = sband->bitrates[ 350 info->status.rates[0].idx].bitrate / 5; 351 352 /* for now report the total retry_count */ 353 rthdr->data_retries = retry_count; 354 355 skb_set_mac_header(skb, 0); 356 skb->ip_summed = CHECKSUM_UNNECESSARY; 357 skb->pkt_type = PACKET_OTHERHOST; 358 skb->protocol = htons(ETH_P_802_2); 359 memset(skb->cb, 0, sizeof(skb->cb)); 360 361 rcu_read_lock(); 362 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 363 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 364 if (!ieee80211_sdata_running(sdata)) 365 continue; 366 367 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 368 !send_to_cooked) 369 continue; 370 371 if (prev_dev) { 372 skb2 = skb_clone(skb, GFP_ATOMIC); 373 if (skb2) { 374 skb2->dev = prev_dev; 375 netif_rx(skb2); 376 } 377 } 378 379 prev_dev = sdata->dev; 380 } 381 } 382 if (prev_dev) { 383 skb->dev = prev_dev; 384 netif_rx(skb); 385 skb = NULL; 386 } 387 rcu_read_unlock(); 388 dev_kfree_skb(skb); 389} 390EXPORT_SYMBOL(ieee80211_tx_status); 391