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-rw-r--r--net/mac80211/status.c978
1 files changed, 978 insertions, 0 deletions
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
new file mode 100644
index 0000000..83b8b11
--- /dev/null
+++ b/net/mac80211/status.c
@@ -0,0 +1,978 @@
+/*
+ * 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>
+ * Copyright 2013-2014 Intel Mobile Communications GmbH
+ *
+ * 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 <linux/export.h>
+#include <linux/etherdevice.h>
+#include <net/mac80211.h>
+#include <asm/unaligned.h>
+#include "ieee80211_i.h"
+#include "rate.h"
+#include "mesh.h"
+#include "led.h"
+#include "wme.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))) {
+ ieee80211_free_txskb(hw, 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);
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ int ac;
+
+ if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
+ IEEE80211_TX_CTL_AMPDU)) {
+ ieee80211_free_txskb(&local->hw, skb);
+ return;
+ }
+
+ /*
+ * 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;
+ info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
+
+ sta->status_stats.filtered++;
+
+ /*
+ * Clear more-data bit on filtered frames, it might be set
+ * but later frames might time out so it might have to be
+ * clear again ... It's all rather unlikely (this frame
+ * should time out first, right?) but let's not confuse
+ * peers unnecessarily.
+ */
+ if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
+ hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+
+ if (ieee80211_is_data_qos(hdr->frame_control)) {
+ u8 *p = ieee80211_get_qos_ctl(hdr);
+ int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
+
+ /*
+ * Clear EOSP if set, this could happen e.g.
+ * if an absence period (us being a P2P GO)
+ * shortens the SP.
+ */
+ if (*p & IEEE80211_QOS_CTL_EOSP)
+ *p &= ~IEEE80211_QOS_CTL_EOSP;
+ ac = ieee80211_ac_from_tid(tid);
+ } else {
+ ac = IEEE80211_AC_BE;
+ }
+
+ /*
+ * 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_flag(sta, WLAN_STA_CLEAR_PS_FILT);
+ ieee80211_clear_fast_xmit(sta);
+
+ /*
+ * 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.
+ * (c) if PS mode transitions are manual (i.e. the flag
+ * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
+ * changes before calling TX status events if ordering can be
+ * unknown.
+ */
+ if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
+ skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
+ skb_queue_tail(&sta->tx_filtered[ac], skb);
+ sta_info_recalc_tim(sta);
+
+ if (!timer_pending(&local->sta_cleanup))
+ mod_timer(&local->sta_cleanup,
+ round_jiffies(jiffies +
+ STA_INFO_CLEANUP_INTERVAL));
+ return;
+ }
+
+ if (!test_sta_flag(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;
+ }
+
+ ps_dbg_ratelimited(sta->sdata,
+ "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
+ skb_queue_len(&sta->tx_filtered[ac]),
+ !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
+ ieee80211_free_txskb(&local->hw, skb);
+}
+
+static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
+{
+ struct tid_ampdu_tx *tid_tx;
+
+ tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
+ if (!tid_tx || !tid_tx->bar_pending)
+ return;
+
+ tid_tx->bar_pending = false;
+ ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
+}
+
+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_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
+ sta->status_stats.last_ack = jiffies;
+
+ if (ieee80211_is_data_qos(mgmt->frame_control)) {
+ struct ieee80211_hdr *hdr = (void *) skb->data;
+ u8 *qc = ieee80211_get_qos_ctl(hdr);
+ u16 tid = qc[0] & 0xf;
+
+ ieee80211_check_pending_bar(sta, hdr->addr1, tid);
+ }
+
+ if (ieee80211_is_action(mgmt->frame_control) &&
+ mgmt->u.action.category == WLAN_CATEGORY_HT &&
+ mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
+ ieee80211_sdata_running(sdata)) {
+ enum ieee80211_smps_mode smps_mode;
+
+ switch (mgmt->u.action.u.ht_smps.smps_control) {
+ case WLAN_HT_SMPS_CONTROL_DYNAMIC:
+ smps_mode = IEEE80211_SMPS_DYNAMIC;
+ break;
+ case WLAN_HT_SMPS_CONTROL_STATIC:
+ smps_mode = IEEE80211_SMPS_STATIC;
+ break;
+ case WLAN_HT_SMPS_CONTROL_DISABLED:
+ default: /* shouldn't happen since we don't send that */
+ smps_mode = IEEE80211_SMPS_OFF;
+ break;
+ }
+
+ if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ /*
+ * 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 in managed mode is before association.
+ */
+ sdata->smps_mode = smps_mode;
+ ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
+ } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
+ sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
+ sta->known_smps_mode = smps_mode;
+ }
+ }
+}
+
+static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
+{
+ struct tid_ampdu_tx *tid_tx;
+
+ tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
+ if (!tid_tx)
+ return;
+
+ tid_tx->failed_bar_ssn = ssn;
+ tid_tx->bar_pending = true;
+}
+
+static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
+{
+ int len = sizeof(struct ieee80211_radiotap_header);
+
+ /* IEEE80211_RADIOTAP_RATE rate */
+ if (info->status.rates[0].idx >= 0 &&
+ !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
+ IEEE80211_TX_RC_VHT_MCS)))
+ len += 2;
+
+ /* IEEE80211_RADIOTAP_TX_FLAGS */
+ len += 2;
+
+ /* IEEE80211_RADIOTAP_DATA_RETRIES */
+ len += 1;
+
+ /* IEEE80211_RADIOTAP_MCS
+ * IEEE80211_RADIOTAP_VHT */
+ if (info->status.rates[0].idx >= 0) {
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
+ len += 3;
+ else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
+ len = ALIGN(len, 2) + 12;
+ }
+
+ return len;
+}
+
+static void
+ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
+ struct ieee80211_supported_band *sband,
+ struct sk_buff *skb, int retry_count,
+ int rtap_len, int shift)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_radiotap_header *rthdr;
+ unsigned char *pos;
+ u16 txflags;
+
+ rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
+
+ memset(rthdr, 0, rtap_len);
+ rthdr->it_len = cpu_to_le16(rtap_len);
+ rthdr->it_present =
+ cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
+ (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
+ pos = (unsigned char *)(rthdr + 1);
+
+ /*
+ * XXX: Once radiotap gets the bitmap reset thing the vendor
+ * extensions proposal contains, we can actually report
+ * the whole set of tries we did.
+ */
+
+ /* IEEE80211_RADIOTAP_RATE */
+ if (info->status.rates[0].idx >= 0 &&
+ !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
+ IEEE80211_TX_RC_VHT_MCS))) {
+ u16 rate;
+
+ rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
+ rate = sband->bitrates[info->status.rates[0].idx].bitrate;
+ *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
+ /* padding for tx flags */
+ pos += 2;
+ }
+
+ /* IEEE80211_RADIOTAP_TX_FLAGS */
+ txflags = 0;
+ if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
+ !is_multicast_ether_addr(hdr->addr1))
+ txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
+
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
+ txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
+ txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
+
+ put_unaligned_le16(txflags, pos);
+ pos += 2;
+
+ /* IEEE80211_RADIOTAP_DATA_RETRIES */
+ /* for now report the total retry_count */
+ *pos = retry_count;
+ pos++;
+
+ if (info->status.rates[0].idx < 0)
+ return;
+
+ /* IEEE80211_RADIOTAP_MCS
+ * IEEE80211_RADIOTAP_VHT */
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
+ rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
+ pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
+ IEEE80211_RADIOTAP_MCS_HAVE_GI |
+ IEEE80211_RADIOTAP_MCS_HAVE_BW;
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
+ pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
+ pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
+ pos[2] = info->status.rates[0].idx;
+ pos += 3;
+ } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
+ u16 known = local->hw.radiotap_vht_details &
+ (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
+ IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
+
+ rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
+
+ /* required alignment from rthdr */
+ pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
+
+ /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
+ put_unaligned_le16(known, pos);
+ pos += 2;
+
+ /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
+ *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
+ pos++;
+
+ /* u8 bandwidth */
+ if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ *pos = 1;
+ else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
+ *pos = 4;
+ else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
+ *pos = 11;
+ else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
+ *pos = 0;
+ pos++;
+
+ /* u8 mcs_nss[4] */
+ *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
+ ieee80211_rate_get_vht_nss(&info->status.rates[0]);
+ pos += 4;
+
+ /* u8 coding */
+ pos++;
+ /* u8 group_id */
+ pos++;
+ /* u16 partial_aid */
+ pos += 2;
+ }
+}
+
+/*
+ * Handles the tx for TDLS teardown frames.
+ * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
+ */
+static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
+ struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb, u32 flags)
+{
+ struct sk_buff *teardown_skb;
+ struct sk_buff *orig_teardown_skb;
+ bool is_teardown = false;
+
+ /* Get the teardown data we need and free the lock */
+ spin_lock(&sdata->u.mgd.teardown_lock);
+ teardown_skb = sdata->u.mgd.teardown_skb;
+ orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
+ if ((skb == orig_teardown_skb) && teardown_skb) {
+ sdata->u.mgd.teardown_skb = NULL;
+ sdata->u.mgd.orig_teardown_skb = NULL;
+ is_teardown = true;
+ }
+ spin_unlock(&sdata->u.mgd.teardown_lock);
+
+ if (is_teardown) {
+ /* This mechanism relies on being able to get ACKs */
+ WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
+
+ /* Check if peer has ACKed */
+ if (flags & IEEE80211_TX_STAT_ACK) {
+ dev_kfree_skb_any(teardown_skb);
+ } else {
+ tdls_dbg(sdata,
+ "TDLS Resending teardown through AP\n");
+
+ ieee80211_subif_start_xmit(teardown_skb, skb->dev);
+ }
+ }
+}
+
+static struct ieee80211_sub_if_data *
+ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ if (skb->dev) {
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ if (!sdata->dev)
+ continue;
+
+ if (skb->dev == sdata->dev)
+ return sdata;
+ }
+
+ return NULL;
+ }
+
+ return rcu_dereference(local->p2p_sdata);
+}
+
+static void ieee80211_report_ack_skb(struct ieee80211_local *local,
+ struct ieee80211_tx_info *info,
+ bool acked, bool dropped)
+{
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ spin_lock_irqsave(&local->ack_status_lock, flags);
+ skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
+ spin_unlock_irqrestore(&local->ack_status_lock, flags);
+
+ if (!skb)
+ return;
+
+ if (dropped) {
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
+ if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
+ u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
+ struct ieee80211_sub_if_data *sdata;
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+
+ rcu_read_lock();
+ sdata = ieee80211_sdata_from_skb(local, skb);
+ if (sdata) {
+ if (ieee80211_is_nullfunc(hdr->frame_control) ||
+ ieee80211_is_qos_nullfunc(hdr->frame_control))
+ cfg80211_probe_status(sdata->dev, hdr->addr1,
+ cookie, acked,
+ GFP_ATOMIC);
+ else
+ cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
+ skb->data, skb->len,
+ acked, GFP_ATOMIC);
+ }
+ rcu_read_unlock();
+
+ dev_kfree_skb_any(skb);
+ } else {
+ /* consumes skb */
+ skb_complete_wifi_ack(skb, acked);
+ }
+}
+
+static void ieee80211_report_used_skb(struct ieee80211_local *local,
+ struct sk_buff *skb, bool dropped)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_hdr *hdr = (void *)skb->data;
+ bool acked = info->flags & IEEE80211_TX_STAT_ACK;
+
+ if (dropped)
+ acked = false;
+
+ if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
+ struct ieee80211_sub_if_data *sdata;
+
+ rcu_read_lock();
+
+ sdata = ieee80211_sdata_from_skb(local, skb);
+
+ if (!sdata) {
+ skb->dev = NULL;
+ } else {
+ unsigned int hdr_size =
+ ieee80211_hdrlen(hdr->frame_control);
+
+ /* Check to see if packet is a TDLS teardown packet */
+ if (ieee80211_is_data(hdr->frame_control) &&
+ (ieee80211_get_tdls_action(skb, hdr_size) ==
+ WLAN_TDLS_TEARDOWN))
+ ieee80211_tdls_td_tx_handle(local, sdata, skb,
+ info->flags);
+ else
+ ieee80211_mgd_conn_tx_status(sdata,
+ hdr->frame_control,
+ acked);
+ }
+
+ rcu_read_unlock();
+ } else if (info->ack_frame_id) {
+ ieee80211_report_ack_skb(local, info, acked, dropped);
+ }
+
+ if (!dropped && skb->destructor) {
+ skb->wifi_acked_valid = 1;
+ skb->wifi_acked = acked;
+ }
+}
+
+/*
+ * Use a static threshold for now, best value to be determined
+ * by testing ...
+ * Should it depend on:
+ * - on # of retransmissions
+ * - current throughput (higher value for higher tpt)?
+ */
+#define STA_LOST_PKT_THRESHOLD 50
+#define STA_LOST_TDLS_PKT_THRESHOLD 10
+#define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
+
+static void ieee80211_lost_packet(struct sta_info *sta,
+ struct ieee80211_tx_info *info)
+{
+ /* If driver relies on its own algorithm for station kickout, skip
+ * mac80211 packet loss mechanism.
+ */
+ if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
+ return;
+
+ /* This packet was aggregated but doesn't carry status info */
+ if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
+ !(info->flags & IEEE80211_TX_STAT_AMPDU))
+ return;
+
+ sta->status_stats.lost_packets++;
+ if (!sta->sta.tdls &&
+ sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
+ return;
+
+ /*
+ * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
+ * of the last packets were lost, and that no ACK was received in the
+ * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
+ * mechanism.
+ */
+ if (sta->sta.tdls &&
+ (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
+ time_before(jiffies,
+ sta->status_stats.last_tdls_pkt_time +
+ STA_LOST_TDLS_PKT_TIME)))
+ return;
+
+ cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
+ sta->status_stats.lost_packets, GFP_ATOMIC);
+ sta->status_stats.lost_packets = 0;
+}
+
+static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
+ struct ieee80211_tx_info *info,
+ int *retry_count)
+{
+ int rates_idx = -1;
+ int count = -1;
+ int i;
+
+ for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
+ if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
+ !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
+ /* just the first aggr frame carry status info */
+ info->status.rates[i].idx = -1;
+ info->status.rates[i].count = 0;
+ break;
+ } else if (info->status.rates[i].idx < 0) {
+ break;
+ } else if (i >= hw->max_report_rates) {
+ /* the HW cannot have attempted that rate */
+ info->status.rates[i].idx = -1;
+ info->status.rates[i].count = 0;
+ break;
+ }
+
+ count += info->status.rates[i].count;
+ }
+ rates_idx = i - 1;
+
+ if (count < 0)
+ count = 0;
+
+ *retry_count = count;
+ return rates_idx;
+}
+
+void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
+ struct ieee80211_sta *pubsta,
+ struct ieee80211_tx_info *info)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_supported_band *sband;
+ int retry_count;
+ bool acked, noack_success;
+
+ ieee80211_tx_get_rates(hw, info, &retry_count);
+
+ sband = hw->wiphy->bands[info->band];
+
+ acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
+ noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
+
+ if (pubsta) {
+ struct sta_info *sta;
+
+ sta = container_of(pubsta, struct sta_info, sta);
+
+ if (!acked)
+ sta->status_stats.retry_failed++;
+ sta->status_stats.retry_count += retry_count;
+
+ if (acked) {
+ sta->status_stats.last_ack = jiffies;
+
+ if (sta->status_stats.lost_packets)
+ sta->status_stats.lost_packets = 0;
+
+ /* Track when last TDLS packet was ACKed */
+ if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
+ sta->status_stats.last_tdls_pkt_time = jiffies;
+ } else {
+ ieee80211_lost_packet(sta, info);
+ }
+
+ rate_control_tx_status_noskb(local, sband, sta, info);
+ }
+
+ if (acked || noack_success) {
+ I802_DEBUG_INC(local->dot11TransmittedFrameCount);
+ if (!pubsta)
+ I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
+ if (retry_count > 0)
+ I802_DEBUG_INC(local->dot11RetryCount);
+ if (retry_count > 1)
+ I802_DEBUG_INC(local->dot11MultipleRetryCount);
+ } else {
+ I802_DEBUG_INC(local->dot11FailedCount);
+ }
+}
+EXPORT_SYMBOL(ieee80211_tx_status_noskb);
+
+void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
+ struct ieee80211_supported_band *sband,
+ int retry_count, int shift, bool send_to_cooked)
+{
+ struct sk_buff *skb2;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sub_if_data *sdata;
+ struct net_device *prev_dev = NULL;
+ int rtap_len;
+
+ /* send frame to monitor interfaces now */
+ rtap_len = ieee80211_tx_radiotap_len(info);
+ if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
+ pr_err("ieee80211_tx_status: headroom too small\n");
+ dev_kfree_skb(skb);
+ return;
+ }
+ ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
+ rtap_len, shift);
+
+ /* XXX: is this sufficient for BPF? */
+ skb_reset_mac_header(skb);
+ 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_rx(skb2);
+ }
+ }
+
+ prev_dev = sdata->dev;
+ }
+ }
+ if (prev_dev) {
+ skb->dev = prev_dev;
+ netif_rx(skb);
+ skb = NULL;
+ }
+ rcu_read_unlock();
+ dev_kfree_skb(skb);
+}
+
+void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+ 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);
+ __le16 fc;
+ struct ieee80211_supported_band *sband;
+ struct rhlist_head *tmp;
+ struct sta_info *sta;
+ int retry_count;
+ int rates_idx;
+ bool send_to_cooked;
+ bool acked;
+ struct ieee80211_bar *bar;
+ int shift = 0;
+ int tid = IEEE80211_NUM_TIDS;
+
+ rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
+
+ 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 (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
+ continue;
+
+ shift = ieee80211_vif_get_shift(&sta->sdata->vif);
+
+ if (info->flags & IEEE80211_TX_STATUS_EOSP)
+ clear_sta_flag(sta, WLAN_STA_SP);
+
+ acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
+
+ /* mesh Peer Service Period support */
+ if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
+ ieee80211_is_data_qos(fc))
+ ieee80211_mpsp_trigger_process(
+ ieee80211_get_qos_ctl(hdr), sta, true, acked);
+
+ if (!acked && test_sta_flag(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 (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
+ (ieee80211_is_data(hdr->frame_control)) &&
+ (rates_idx != -1))
+ sta->tx_stats.last_rate =
+ info->status.rates[rates_idx];
+
+ if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
+ (ieee80211_is_data_qos(fc))) {
+ u16 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->vif, hdr->addr1,
+ tid, ssn);
+ } else if (ieee80211_is_data_qos(fc)) {
+ u8 *qc = ieee80211_get_qos_ctl(hdr);
+
+ tid = qc[0] & 0xf;
+ }
+
+ if (!acked && ieee80211_is_back_req(fc)) {
+ u16 control;
+
+ /*
+ * BAR failed, store the last SSN and retry sending
+ * the BAR when the next unicast transmission on the
+ * same TID succeeds.
+ */
+ bar = (struct ieee80211_bar *) skb->data;
+ control = le16_to_cpu(bar->control);
+ if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
+ u16 ssn = le16_to_cpu(bar->start_seq_num);
+
+ tid = (control &
+ IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
+ IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
+
+ ieee80211_set_bar_pending(sta, tid, ssn);
+ }
+ }
+
+ if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
+ ieee80211_handle_filtered_frame(local, sta, skb);
+ rcu_read_unlock();
+ return;
+ } else {
+ if (!acked)
+ sta->status_stats.retry_failed++;
+ sta->status_stats.retry_count += retry_count;
+
+ if (ieee80211_is_data_present(fc)) {
+ if (!acked)
+ sta->status_stats.msdu_failed[tid]++;
+
+ sta->status_stats.msdu_retries[tid] +=
+ 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) && acked)
+ ieee80211_frame_acked(sta, skb);
+
+ if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
+ ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
+ ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
+ acked, info->status.tx_time);
+
+ if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
+ if (info->flags & IEEE80211_TX_STAT_ACK) {
+ if (sta->status_stats.lost_packets)
+ sta->status_stats.lost_packets = 0;
+
+ /* Track when last TDLS packet was ACKed */
+ if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
+ sta->status_stats.last_tdls_pkt_time =
+ jiffies;
+ } else {
+ ieee80211_lost_packet(sta, info);
+ }
+ }
+ }
+
+ rcu_read_unlock();
+
+ ieee80211_led_tx(local);
+
+ /* 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. */
+ if ((info->flags & IEEE80211_TX_STAT_ACK) ||
+ (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
+ if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
+ I802_DEBUG_INC(local->dot11TransmittedFrameCount);
+ if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
+ I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
+ if (retry_count > 0)
+ I802_DEBUG_INC(local->dot11RetryCount);
+ if (retry_count > 1)
+ I802_DEBUG_INC(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) ||
+ ieee80211_is_data(fc) ||
+ ieee80211_is_mgmt(fc))
+ I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
+ } else {
+ if (ieee80211_is_first_frag(hdr->seq_ctrl))
+ I802_DEBUG_INC(local->dot11FailedCount);
+ }
+
+ if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
+ ieee80211_hw_check(&local->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;
+ } else
+ mod_timer(&local->dynamic_ps_timer, jiffies +
+ msecs_to_jiffies(10));
+ }
+
+ ieee80211_report_used_skb(local, skb, false);
+
+ /* 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) ||
+ !(ieee80211_is_data(fc));
+
+ /*
+ * 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 to monitor interfaces */
+ ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
+}
+EXPORT_SYMBOL(ieee80211_tx_status);
+
+void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+ cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
+ num_packets, GFP_ATOMIC);
+}
+EXPORT_SYMBOL(ieee80211_report_low_ack);
+
+void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+
+ ieee80211_report_used_skb(local, skb, true);
+ dev_kfree_skb_any(skb);
+}
+EXPORT_SYMBOL(ieee80211_free_txskb);
+
+void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
+ struct sk_buff_head *skbs)
+{
+ struct sk_buff *skb;
+
+ while ((skb = __skb_dequeue(skbs)))
+ ieee80211_free_txskb(hw, skb);
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-26 19:01:02 +0000