Commit 54ab1ffb authored by Thomas Pedersen's avatar Thomas Pedersen Committed by John W. Linville
Browse files

mac80211: refactor mesh peer initialization 



This patch unifies the previous two paths toward mesh peer creation a
bit. It also fixes a bug where a peer's changing rates or HT mode
wouldn't register on leaving and then returning to the mesh with a sta
entry still present.

Also clean up locking and clear possibly stale ht cap.

Signed-off-by: default avatarThomas Pedersen <thomas@cozybit.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 75acd5a8

net/mac80211/mesh_plink.c

+72 −54
Original line number Diff line number Diff line
@@ -82,20 +82,14 @@ static inline void mesh_plink_fsm_restart(struct sta_info *sta) 
}



/*

 * NOTE: This is just an alias for sta_info_alloc(), see notes

 *       on it in the lifecycle management section!

 * Allocate mesh sta entry and insert into station table

 */

static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,

					 u8 *hw_addr, u32 rates,

					 struct ieee802_11_elems *elems)

					 u8 *hw_addr)

{

	struct ieee80211_local *local = sdata->local;

	struct ieee80211_supported_band *sband;

	struct sta_info *sta;



	sband = local->hw.wiphy->bands[local->oper_channel->band];



	if (local->num_sta >= MESH_MAX_PLINKS)

	if (sdata->local->num_sta >= MESH_MAX_PLINKS)

		return NULL;



	sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
@@ -108,12 +102,8 @@ static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, 


	set_sta_flag(sta, WLAN_STA_WME);



	sta->sta.supp_rates[local->hw.conf.channel->band] = rates;

	if (elems->ht_cap_elem)

		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,

						  elems->ht_cap_elem,

						  &sta->sta.ht_cap);

	rate_control_rate_init(sta);

	if (sta_info_insert(sta))

		return NULL;



	return sta;

}
@@ -274,36 +264,68 @@ static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, 
	return 0;

}



void mesh_neighbour_update(u8 *hw_addr, u32 rates,

		struct ieee80211_sub_if_data *sdata,

/* mesh_peer_init - initialize new mesh peer and return resulting sta_info

 *

 * @sdata: local meshif

 * @addr: peer's address

 * @rates: station's supported rates

 * @elems: IEs from beacon or mesh peering frame

 *

 * call under RCU

 */

static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata,

				       u8 *addr, u32 rates,

				       struct ieee802_11_elems *elems)

{

	struct ieee80211_local *local = sdata->local;

	struct ieee80211_supported_band *sband;

	struct sta_info *sta;



	rcu_read_lock();

	sband = local->hw.wiphy->bands[local->oper_channel->band];



	sta = sta_info_get(sdata, hw_addr);

	sta = sta_info_get(sdata, addr);

	if (!sta) {

		rcu_read_unlock();

		/* Userspace handles peer allocation when security is enabled

		 * */

		if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)

			cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr,

					elems->ie_start, elems->total_len,

					GFP_KERNEL);

		else

			sta = mesh_plink_alloc(sdata, hw_addr, rates, elems);

		sta = mesh_plink_alloc(sdata, addr);

		if (!sta)

			return;

		if (sta_info_insert_rcu(sta)) {

			rcu_read_unlock();

			return;

		}

			return NULL;

	}



	spin_lock_bh(&sta->lock);

	sta->last_rx = jiffies;

	sta->sta.supp_rates[local->hw.conf.channel->band] = rates;

	if (elems->ht_cap_elem)

		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,

						  elems->ht_cap_elem,

						  &sta->sta.ht_cap);

	else

		memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap));



	rate_control_rate_init(sta);

	spin_unlock_bh(&sta->lock);



	return sta;

}



void mesh_neighbour_update(u8 *hw_addr, u32 rates,

			   struct ieee80211_sub_if_data *sdata,

			   struct ieee802_11_elems *elems)

{

	struct sta_info *sta;



	/* Userspace handles peer allocation when security is enabled */

	if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {

		cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr,

						   elems->ie_start,

						   elems->total_len,

						   GFP_KERNEL);

		return;

	}



	rcu_read_lock();

	sta = mesh_peer_init(sdata, hw_addr, rates, elems);

	if (!sta)

		goto out;



	if (mesh_peer_accepts_plinks(elems) &&

	    sta->plink_state == NL80211_PLINK_LISTEN &&

	    sdata->u.mesh.accepting_plinks &&
@@ -311,6 +333,7 @@ void mesh_neighbour_update(u8 *hw_addr, u32 rates, 
	    rssi_threshold_check(sta, sdata))

		mesh_plink_open(sta);



out:

	rcu_read_unlock();

}
@@ -587,26 +610,13 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m 
		return;

	} else if (!sta) {

		/* ftype == WLAN_SP_MESH_PEERING_OPEN */



		rcu_read_unlock();



		if (!mesh_plink_free_count(sdata)) {

			mpl_dbg("Mesh plink error: no more free plinks\n");

			return;

		}

		sta = mesh_plink_alloc(sdata, mgmt->sa, rates, &elems);

		if (!sta) {

			mpl_dbg("Mesh plink error: plink table full\n");

			return;

		}

		if (sta_info_insert_rcu(sta)) {

			rcu_read_unlock();

			return;

		}

		event = OPN_ACPT;

		spin_lock_bh(&sta->lock);

	} else if (matches_local) {

		spin_lock_bh(&sta->lock);

		switch (ftype) {

		case WLAN_SP_MESH_PEERING_OPEN:

			if (!mesh_plink_free_count(sdata) ||
@@ -643,12 +653,19 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m 
			break;

		default:

			mpl_dbg("Mesh plink: unknown frame subtype\n");

			spin_unlock_bh(&sta->lock);

			rcu_read_unlock();

			return;

		}

	} else {

		spin_lock_bh(&sta->lock);

	}



	if (event == OPN_ACPT) {

		/* allocate sta entry if necessary and update info */

		sta = mesh_peer_init(sdata, mgmt->sa, rates, &elems);

		if (!sta) {

			mpl_dbg("Mesh plink: failed to init peer!\n");

			rcu_read_unlock();

			return;

		}

	}



	mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
@@ -656,6 +673,7 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m 
		le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),

		event);

	reason = 0;

	spin_lock_bh(&sta->lock);

	switch (sta->plink_state) {

		/* spin_unlock as soon as state is updated at each case */

	case NL80211_PLINK_LISTEN:

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