| /* |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "rate.h" |
| #include "mesh.h" |
| #include "led.h" |
| |
| |
| void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| int tmp; |
| |
| skb->pkt_type = IEEE80211_TX_STATUS_MSG; |
| skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? |
| &local->skb_queue : &local->skb_queue_unreliable, skb); |
| tmp = skb_queue_len(&local->skb_queue) + |
| skb_queue_len(&local->skb_queue_unreliable); |
| while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && |
| (skb = skb_dequeue(&local->skb_queue_unreliable))) { |
| dev_kfree_skb_irq(skb); |
| tmp--; |
| I802_DEBUG_INC(local->tx_status_drop); |
| } |
| tasklet_schedule(&local->tasklet); |
| } |
| EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); |
| |
| static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, |
| struct sta_info *sta, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| |
| /* |
| * This skb 'survived' a round-trip through the driver, and |
| * hopefully the driver didn't mangle it too badly. However, |
| * we can definitely not rely on the control information |
| * being correct. Clear it so we don't get junk there, and |
| * indicate that it needs new processing, but must not be |
| * modified/encrypted again. |
| */ |
| memset(&info->control, 0, sizeof(info->control)); |
| |
| info->control.jiffies = jiffies; |
| info->control.vif = &sta->sdata->vif; |
| info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | |
| IEEE80211_TX_INTFL_RETRANSMISSION; |
| |
| sta->tx_filtered_count++; |
| |
| /* |
| * Clear the TX filter mask for this STA when sending the next |
| * packet. If the STA went to power save mode, this will happen |
| * when it wakes up for the next time. |
| */ |
| set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); |
| |
| /* |
| * This code races in the following way: |
| * |
| * (1) STA sends frame indicating it will go to sleep and does so |
| * (2) hardware/firmware adds STA to filter list, passes frame up |
| * (3) hardware/firmware processes TX fifo and suppresses a frame |
| * (4) we get TX status before having processed the frame and |
| * knowing that the STA has gone to sleep. |
| * |
| * This is actually quite unlikely even when both those events are |
| * processed from interrupts coming in quickly after one another or |
| * even at the same time because we queue both TX status events and |
| * RX frames to be processed by a tasklet and process them in the |
| * same order that they were received or TX status last. Hence, there |
| * is no race as long as the frame RX is processed before the next TX |
| * status, which drivers can ensure, see below. |
| * |
| * Note that this can only happen if the hardware or firmware can |
| * actually add STAs to the filter list, if this is done by the |
| * driver in response to set_tim() (which will only reduce the race |
| * this whole filtering tries to solve, not completely solve it) |
| * this situation cannot happen. |
| * |
| * To completely solve this race drivers need to make sure that they |
| * (a) don't mix the irq-safe/not irq-safe TX status/RX processing |
| * functions and |
| * (b) always process RX events before TX status events if ordering |
| * can be unknown, for example with different interrupt status |
| * bits. |
| */ |
| if (test_sta_flags(sta, WLAN_STA_PS_STA) && |
| skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { |
| skb_queue_tail(&sta->tx_filtered, skb); |
| return; |
| } |
| |
| if (!test_sta_flags(sta, WLAN_STA_PS_STA) && |
| !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { |
| /* Software retry the packet once */ |
| info->flags |= IEEE80211_TX_INTFL_RETRIED; |
| ieee80211_add_pending_skb(local, skb); |
| return; |
| } |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "%s: dropped TX filtered frame, " |
| "queue_len=%d PS=%d @%lu\n", |
| wiphy_name(local->hw.wiphy), |
| skb_queue_len(&sta->tx_filtered), |
| !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies); |
| #endif |
| dev_kfree_skb(skb); |
| } |
| |
| static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) |
| { |
| struct ieee80211_mgmt *mgmt = (void *) skb->data; |
| struct ieee80211_local *local = sta->local; |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| |
| if (ieee80211_is_action(mgmt->frame_control) && |
| sdata->vif.type == NL80211_IFTYPE_STATION && |
| mgmt->u.action.category == WLAN_CATEGORY_HT && |
| mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) { |
| /* |
| * This update looks racy, but isn't -- if we come |
| * here we've definitely got a station that we're |
| * talking to, and on a managed interface that can |
| * only be the AP. And the only other place updating |
| * this variable is before we're associated. |
| */ |
| switch (mgmt->u.action.u.ht_smps.smps_control) { |
| case WLAN_HT_SMPS_CONTROL_DYNAMIC: |
| sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC; |
| break; |
| case WLAN_HT_SMPS_CONTROL_STATIC: |
| sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC; |
| break; |
| case WLAN_HT_SMPS_CONTROL_DISABLED: |
| default: /* shouldn't happen since we don't send that */ |
| sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF; |
| break; |
| } |
| |
| ieee80211_queue_work(&local->hw, &local->recalc_smps); |
| } |
| } |
| |
| void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) |
| { |
| struct sk_buff *skb2; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| u16 frag, type; |
| __le16 fc; |
| struct ieee80211_supported_band *sband; |
| struct ieee80211_tx_status_rtap_hdr *rthdr; |
| struct ieee80211_sub_if_data *sdata; |
| struct net_device *prev_dev = NULL; |
| struct sta_info *sta, *tmp; |
| int retry_count = -1, i; |
| int rates_idx = -1; |
| bool send_to_cooked; |
| |
| for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
| /* the HW cannot have attempted that rate */ |
| if (i >= hw->max_rates) { |
| info->status.rates[i].idx = -1; |
| info->status.rates[i].count = 0; |
| } else if (info->status.rates[i].idx >= 0) { |
| rates_idx = i; |
| } |
| |
| retry_count += info->status.rates[i].count; |
| } |
| if (retry_count < 0) |
| retry_count = 0; |
| |
| rcu_read_lock(); |
| |
| sband = local->hw.wiphy->bands[info->band]; |
| fc = hdr->frame_control; |
| |
| for_each_sta_info(local, hdr->addr1, sta, tmp) { |
| /* skip wrong virtual interface */ |
| if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN)) |
| continue; |
| |
| if (!(info->flags & IEEE80211_TX_STAT_ACK) && |
| test_sta_flags(sta, WLAN_STA_PS_STA)) { |
| /* |
| * The STA is in power save mode, so assume |
| * that this TX packet failed because of that. |
| */ |
| ieee80211_handle_filtered_frame(local, sta, skb); |
| rcu_read_unlock(); |
| return; |
| } |
| |
| if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && |
| (rates_idx != -1)) |
| sta->last_tx_rate = info->status.rates[rates_idx]; |
| |
| if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && |
| (ieee80211_is_data_qos(fc))) { |
| u16 tid, ssn; |
| u8 *qc; |
| |
| qc = ieee80211_get_qos_ctl(hdr); |
| tid = qc[0] & 0xf; |
| ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) |
| & IEEE80211_SCTL_SEQ); |
| ieee80211_send_bar(sta->sdata, hdr->addr1, |
| tid, ssn); |
| } |
| |
| if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { |
| ieee80211_handle_filtered_frame(local, sta, skb); |
| rcu_read_unlock(); |
| return; |
| } else { |
| if (!(info->flags & IEEE80211_TX_STAT_ACK)) |
| sta->tx_retry_failed++; |
| sta->tx_retry_count += retry_count; |
| } |
| |
| rate_control_tx_status(local, sband, sta, skb); |
| if (ieee80211_vif_is_mesh(&sta->sdata->vif)) |
| ieee80211s_update_metric(local, sta, skb); |
| |
| if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && |
| (info->flags & IEEE80211_TX_STAT_ACK)) |
| ieee80211_frame_acked(sta, skb); |
| } |
| |
| rcu_read_unlock(); |
| |
| ieee80211_led_tx(local, 0); |
| |
| /* SNMP counters |
| * Fragments are passed to low-level drivers as separate skbs, so these |
| * are actually fragments, not frames. Update frame counters only for |
| * the first fragment of the frame. */ |
| |
| frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; |
| type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; |
| |
| if (info->flags & IEEE80211_TX_STAT_ACK) { |
| if (frag == 0) { |
| local->dot11TransmittedFrameCount++; |
| if (is_multicast_ether_addr(hdr->addr1)) |
| local->dot11MulticastTransmittedFrameCount++; |
| if (retry_count > 0) |
| local->dot11RetryCount++; |
| if (retry_count > 1) |
| local->dot11MultipleRetryCount++; |
| } |
| |
| /* This counter shall be incremented for an acknowledged MPDU |
| * with an individual address in the address 1 field or an MPDU |
| * with a multicast address in the address 1 field of type Data |
| * or Management. */ |
| if (!is_multicast_ether_addr(hdr->addr1) || |
| type == IEEE80211_FTYPE_DATA || |
| type == IEEE80211_FTYPE_MGMT) |
| local->dot11TransmittedFragmentCount++; |
| } else { |
| if (frag == 0) |
| local->dot11FailedCount++; |
| } |
| |
| if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && |
| (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && |
| !(info->flags & IEEE80211_TX_CTL_INJECTED) && |
| local->ps_sdata && !(local->scanning)) { |
| if (info->flags & IEEE80211_TX_STAT_ACK) { |
| local->ps_sdata->u.mgd.flags |= |
| IEEE80211_STA_NULLFUNC_ACKED; |
| ieee80211_queue_work(&local->hw, |
| &local->dynamic_ps_enable_work); |
| } else |
| mod_timer(&local->dynamic_ps_timer, jiffies + |
| msecs_to_jiffies(10)); |
| } |
| |
| if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) |
| cfg80211_mgmt_tx_status( |
| skb->dev, (unsigned long) skb, skb->data, skb->len, |
| !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC); |
| |
| /* this was a transmitted frame, but now we want to reuse it */ |
| skb_orphan(skb); |
| |
| /* Need to make a copy before skb->cb gets cleared */ |
| send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || |
| (type != IEEE80211_FTYPE_DATA); |
| |
| /* |
| * This is a bit racy but we can avoid a lot of work |
| * with this test... |
| */ |
| if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { |
| dev_kfree_skb(skb); |
| return; |
| } |
| |
| /* send frame to monitor interfaces now */ |
| |
| if (skb_headroom(skb) < sizeof(*rthdr)) { |
| printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); |
| dev_kfree_skb(skb); |
| return; |
| } |
| |
| rthdr = (struct ieee80211_tx_status_rtap_hdr *) |
| skb_push(skb, sizeof(*rthdr)); |
| |
| memset(rthdr, 0, sizeof(*rthdr)); |
| rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); |
| rthdr->hdr.it_present = |
| cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | |
| (1 << IEEE80211_RADIOTAP_DATA_RETRIES) | |
| (1 << IEEE80211_RADIOTAP_RATE)); |
| |
| if (!(info->flags & IEEE80211_TX_STAT_ACK) && |
| !is_multicast_ether_addr(hdr->addr1)) |
| rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); |
| |
| /* |
| * XXX: Once radiotap gets the bitmap reset thing the vendor |
| * extensions proposal contains, we can actually report |
| * the whole set of tries we did. |
| */ |
| if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || |
| (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) |
| rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); |
| else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) |
| rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); |
| if (info->status.rates[0].idx >= 0 && |
| !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) |
| rthdr->rate = sband->bitrates[ |
| info->status.rates[0].idx].bitrate / 5; |
| |
| /* for now report the total retry_count */ |
| rthdr->data_retries = retry_count; |
| |
| /* XXX: is this sufficient for BPF? */ |
| skb_set_mac_header(skb, 0); |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| skb->pkt_type = PACKET_OTHERHOST; |
| skb->protocol = htons(ETH_P_802_2); |
| memset(skb->cb, 0, sizeof(skb->cb)); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { |
| if (!ieee80211_sdata_running(sdata)) |
| continue; |
| |
| if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && |
| !send_to_cooked) |
| continue; |
| |
| if (prev_dev) { |
| skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (skb2) { |
| skb2->dev = prev_dev; |
| netif_receive_skb(skb2); |
| } |
| } |
| |
| prev_dev = sdata->dev; |
| } |
| } |
| if (prev_dev) { |
| skb->dev = prev_dev; |
| netif_receive_skb(skb); |
| skb = NULL; |
| } |
| rcu_read_unlock(); |
| dev_kfree_skb(skb); |
| } |
| EXPORT_SYMBOL(ieee80211_tx_status); |