Commit 17e6a59a authored by Arik Nemtsov's avatar Arik Nemtsov Committed by Johannes Berg
Browse files

mac80211: cleanup TDLS state during failed setup 



When setting up a TDLS session, register a delayed work to remove
the peer if setup times out. Prevent concurrent setups to support this
capacity.

Signed-off-by: default avatarArik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 68885a54

net/mac80211/ieee80211_i.h

+4 −0
Original line number Diff line number Diff line
@@ -794,6 +794,9 @@ struct ieee80211_sub_if_data { 
	bool radar_required;

	struct delayed_work dfs_cac_timer_work;



	u8 tdls_peer[ETH_ALEN] __aligned(2);

	struct delayed_work tdls_peer_del_work;



	/*

	 * AP this belongs to: self in AP mode and

	 * corresponding AP in VLAN mode, NULL for
@@ -1878,3 +1881,4 @@ extern const struct ethtool_ops ieee80211_ethtool_ops; 
#endif



#endif /* IEEE80211_I_H */

void ieee80211_tdls_peer_del_work(struct work_struct *wk);

net/mac80211/iface.c

+2 −0
Original line number Diff line number Diff line
@@ -1672,6 +1672,8 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name, 
			  ieee80211_dfs_cac_timer_work);

	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,

			  ieee80211_delayed_tailroom_dec);

	INIT_DELAYED_WORK(&sdata->tdls_peer_del_work,

			  ieee80211_tdls_peer_del_work);



	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {

		struct ieee80211_supported_band *sband;

net/mac80211/tdls.c

+109 −24
Original line number Diff line number Diff line
@@ -10,6 +10,27 @@ 
#include <linux/ieee80211.h>

#include "ieee80211_i.h"



/* give usermode some time for retries in setting up the TDLS session */

#define TDLS_PEER_SETUP_TIMEOUT	(15 * HZ)



void ieee80211_tdls_peer_del_work(struct work_struct *wk)

{

	struct ieee80211_sub_if_data *sdata;

	struct ieee80211_local *local;



	sdata = container_of(wk, struct ieee80211_sub_if_data,

			     tdls_peer_del_work.work);

	local = sdata->local;



	mutex_lock(&local->mtx);

	if (!is_zero_ether_addr(sdata->tdls_peer)) {

		tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->tdls_peer);

		sta_info_destroy_addr(sdata, sdata->tdls_peer);

		eth_zero_addr(sdata->tdls_peer);

	}

	mutex_unlock(&local->mtx);

}



static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)

{

	u8 *pos = (void *)skb_put(skb, 7);
@@ -168,10 +189,12 @@ ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, 
	return 0;

}



int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,

			const u8 *peer, u8 action_code, u8 dialog_token,

			u16 status_code, u32 peer_capability,

			const u8 *extra_ies, size_t extra_ies_len)

static int

ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,

				const u8 *peer, u8 action_code,

				u8 dialog_token, u16 status_code,

				u32 peer_capability, const u8 *extra_ies,

				size_t extra_ies_len)

{

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct ieee80211_local *local = sdata->local;
@@ -179,17 +202,6 @@ int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 
	bool send_direct;

	int ret;



	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))

		return -ENOTSUPP;



	/* make sure we are in managed mode, and associated */

	if (sdata->vif.type != NL80211_IFTYPE_STATION ||

	    !sdata->u.mgd.associated)

		return -EINVAL;



	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM\n",

		 action_code, peer);



	skb = dev_alloc_skb(local->hw.extra_tx_headroom +

			    max(sizeof(struct ieee80211_mgmt),

				sizeof(struct ieee80211_tdls_data)) +
@@ -284,11 +296,64 @@ fail: 
	return ret;

}



int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,

			const u8 *peer, u8 action_code, u8 dialog_token,

			u16 status_code, u32 peer_capability,

			const u8 *extra_ies, size_t extra_ies_len)

{

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct ieee80211_local *local = sdata->local;

	int ret;



	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))

		return -ENOTSUPP;



	/* make sure we are in managed mode, and associated */

	if (sdata->vif.type != NL80211_IFTYPE_STATION ||

	    !sdata->u.mgd.associated)

		return -EINVAL;



	mutex_lock(&local->mtx);



	/* we don't support concurrent TDLS peer setups */

	if (!is_zero_ether_addr(sdata->tdls_peer) &&

	    !ether_addr_equal(sdata->tdls_peer, peer) &&

	    (action_code == WLAN_TDLS_SETUP_REQUEST ||

	     action_code == WLAN_TDLS_SETUP_RESPONSE)) {

		ret = -EBUSY;

		goto exit;

	}



	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,

					      dialog_token, status_code,

					      peer_capability, extra_ies,

					      extra_ies_len);

	if (ret < 0)

		goto exit;



	if (action_code == WLAN_TDLS_SETUP_REQUEST ||

	    action_code == WLAN_TDLS_SETUP_RESPONSE) {

		memcpy(sdata->tdls_peer, peer, ETH_ALEN);

		ieee80211_queue_delayed_work(&sdata->local->hw,

					     &sdata->tdls_peer_del_work,

					     TDLS_PEER_SETUP_TIMEOUT);

	}



exit:

	mutex_unlock(&local->mtx);



	tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n",

		 action_code, peer, ret);

	return ret;

}



int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,

			const u8 *peer, enum nl80211_tdls_operation oper)

{

	struct sta_info *sta;

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct ieee80211_local *local = sdata->local;

	int ret;



	if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))

		return -ENOTSUPP;
@@ -296,6 +361,18 @@ int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 
	if (sdata->vif.type != NL80211_IFTYPE_STATION)

		return -EINVAL;



	switch (oper) {

	case NL80211_TDLS_ENABLE_LINK:

	case NL80211_TDLS_DISABLE_LINK:

		break;

	case NL80211_TDLS_TEARDOWN:

	case NL80211_TDLS_SETUP:

	case NL80211_TDLS_DISCOVERY_REQ:

		/* We don't support in-driver setup/teardown/discovery */

		return -ENOTSUPP;

	}



	mutex_lock(&local->mtx);

	tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);



	switch (oper) {
@@ -304,22 +381,30 @@ int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 
		sta = sta_info_get(sdata, peer);

		if (!sta) {

			rcu_read_unlock();

			return -ENOLINK;

			ret = -ENOLINK;

			break;

		}



		set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);

		rcu_read_unlock();



		WARN_ON_ONCE(is_zero_ether_addr(sdata->tdls_peer) ||

			     !ether_addr_equal(sdata->tdls_peer, peer));

		ret = 0;

		break;

	case NL80211_TDLS_DISABLE_LINK:

		return sta_info_destroy_addr(sdata, peer);

	case NL80211_TDLS_TEARDOWN:

	case NL80211_TDLS_SETUP:

	case NL80211_TDLS_DISCOVERY_REQ:

		/* We don't support in-driver setup/teardown/discovery */

		return -ENOTSUPP;

		ret = sta_info_destroy_addr(sdata, peer);

		break;

	default:

		return -ENOTSUPP;

		ret = -ENOTSUPP;

		break;

	}



	return 0;

	if (ret == 0 && ether_addr_equal(sdata->tdls_peer, peer)) {

		cancel_delayed_work(&sdata->tdls_peer_del_work);

		eth_zero_addr(sdata->tdls_peer);

	}



	mutex_unlock(&local->mtx);

	return ret;

}

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