mac80211: TDLS: handle chan-switch in RTNL locked work
Move TDLS channel-switch Rx handling into an RTNL locked work. This is required to add proper regulatory checking to incoming channel-switch requests. Queue incoming requests in a dedicated skb queue and handle the request in a device-specific work to avoid deadlocking on interface removal. Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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72bbe3d1c2
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c8ff71e667
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@ -1008,7 +1008,6 @@ enum sdata_queue_type {
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IEEE80211_SDATA_QUEUE_AGG_STOP = 2,
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IEEE80211_SDATA_QUEUE_RX_AGG_START = 3,
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IEEE80211_SDATA_QUEUE_RX_AGG_STOP = 4,
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IEEE80211_SDATA_QUEUE_TDLS_CHSW = 5,
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};
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enum {
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@ -1351,6 +1350,10 @@ struct ieee80211_local {
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/* extended capabilities provided by mac80211 */
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u8 ext_capa[8];
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/* TDLS channel switch */
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struct work_struct tdls_chsw_work;
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struct sk_buff_head skb_queue_tdls_chsw;
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};
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static inline struct ieee80211_sub_if_data *
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@ -2054,9 +2057,8 @@ int ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
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void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
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struct net_device *dev,
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const u8 *addr);
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void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata);
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void ieee80211_tdls_chsw_work(struct work_struct *wk);
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extern const struct ethtool_ops ieee80211_ethtool_ops;
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@ -1242,8 +1242,6 @@ static void ieee80211_iface_work(struct work_struct *work)
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WLAN_BACK_RECIPIENT, 0,
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false);
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mutex_unlock(&local->sta_mtx);
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} else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
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ieee80211_process_tdls_channel_switch(sdata, skb);
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} else if (ieee80211_is_action(mgmt->frame_control) &&
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mgmt->u.action.category == WLAN_CATEGORY_BACK) {
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int len = skb->len;
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@ -629,6 +629,8 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
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INIT_WORK(&local->sched_scan_stopped_work,
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ieee80211_sched_scan_stopped_work);
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INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);
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spin_lock_init(&local->ack_status_lock);
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idr_init(&local->ack_status_frames);
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@ -645,6 +647,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
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skb_queue_head_init(&local->skb_queue);
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skb_queue_head_init(&local->skb_queue_unreliable);
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skb_queue_head_init(&local->skb_queue_tdls_chsw);
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ieee80211_alloc_led_names(local);
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@ -1161,6 +1164,7 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
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cancel_work_sync(&local->restart_work);
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cancel_work_sync(&local->reconfig_filter);
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cancel_work_sync(&local->tdls_chsw_work);
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flush_work(&local->sched_scan_stopped_work);
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ieee80211_clear_tx_pending(local);
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@ -1171,6 +1175,7 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
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wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
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skb_queue_purge(&local->skb_queue);
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skb_queue_purge(&local->skb_queue_unreliable);
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skb_queue_purge(&local->skb_queue_tdls_chsw);
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destroy_workqueue(local->workqueue);
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wiphy_unregister(local->hw.wiphy);
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@ -2410,9 +2410,8 @@ ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
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tf->category == WLAN_CATEGORY_TDLS &&
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(tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
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tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
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rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
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skb_queue_tail(&sdata->skb_queue, rx->skb);
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ieee80211_queue_work(&rx->local->hw, &sdata->work);
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skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
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schedule_work(&local->tdls_chsw_work);
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if (rx->sta)
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rx->sta->rx_packets++;
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@ -12,6 +12,7 @@
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#include <linux/ieee80211.h>
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#include <linux/log2.h>
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#include <net/cfg80211.h>
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#include <linux/rtnetlink.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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@ -1800,12 +1801,15 @@ out:
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return ret;
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}
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void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
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static void
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ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb)
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{
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struct ieee80211_tdls_data *tf = (void *)skb->data;
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struct wiphy *wiphy = sdata->local->hw.wiphy;
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ASSERT_RTNL();
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/* make sure the driver supports it */
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if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
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return;
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@ -1847,3 +1851,29 @@ void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
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}
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rcu_read_unlock();
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}
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void ieee80211_tdls_chsw_work(struct work_struct *wk)
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{
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struct ieee80211_local *local =
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container_of(wk, struct ieee80211_local, tdls_chsw_work);
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struct ieee80211_sub_if_data *sdata;
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struct sk_buff *skb;
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struct ieee80211_tdls_data *tf;
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rtnl_lock();
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while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) {
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tf = (struct ieee80211_tdls_data *)skb->data;
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata) ||
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sdata->vif.type != NL80211_IFTYPE_STATION ||
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!ether_addr_equal(tf->da, sdata->vif.addr))
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continue;
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ieee80211_process_tdls_channel_switch(sdata, skb);
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break;
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}
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kfree_skb(skb);
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}
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rtnl_unlock();
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}
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