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: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -82,20 +82,14 @@ static inline void mesh_plink_fsm_restart(struct sta_info *sta)
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}
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/*
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* NOTE: This is just an alias for sta_info_alloc(), see notes
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* on it in the lifecycle management section!
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* Allocate mesh sta entry and insert into station table
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*/
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static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
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u8 *hw_addr, u32 rates,
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struct ieee802_11_elems *elems)
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u8 *hw_addr)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_supported_band *sband;
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struct sta_info *sta;
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sband = local->hw.wiphy->bands[local->oper_channel->band];
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if (local->num_sta >= MESH_MAX_PLINKS)
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if (sdata->local->num_sta >= MESH_MAX_PLINKS)
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return NULL;
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sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
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@ -108,12 +102,8 @@ static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
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set_sta_flag(sta, WLAN_STA_WME);
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sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
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if (elems->ht_cap_elem)
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ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
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elems->ht_cap_elem,
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&sta->sta.ht_cap);
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rate_control_rate_init(sta);
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if (sta_info_insert(sta))
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return NULL;
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return sta;
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}
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@ -274,43 +264,76 @@ static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
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return 0;
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}
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void mesh_neighbour_update(u8 *hw_addr, u32 rates,
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struct ieee80211_sub_if_data *sdata,
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struct ieee802_11_elems *elems)
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/* mesh_peer_init - initialize new mesh peer and return resulting sta_info
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*
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* @sdata: local meshif
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* @addr: peer's address
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* @rates: station's supported rates
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* @elems: IEs from beacon or mesh peering frame
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*
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* call under RCU
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*/
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static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata,
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u8 *addr, u32 rates,
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struct ieee802_11_elems *elems)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_supported_band *sband;
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struct sta_info *sta;
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rcu_read_lock();
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sband = local->hw.wiphy->bands[local->oper_channel->band];
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sta = sta_info_get(sdata, hw_addr);
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sta = sta_info_get(sdata, addr);
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if (!sta) {
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rcu_read_unlock();
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/* Userspace handles peer allocation when security is enabled
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* */
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if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
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cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr,
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elems->ie_start, elems->total_len,
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GFP_KERNEL);
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else
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sta = mesh_plink_alloc(sdata, hw_addr, rates, elems);
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sta = mesh_plink_alloc(sdata, addr);
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if (!sta)
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return;
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if (sta_info_insert_rcu(sta)) {
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rcu_read_unlock();
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return;
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}
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return NULL;
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}
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spin_lock_bh(&sta->lock);
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sta->last_rx = jiffies;
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sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
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if (elems->ht_cap_elem)
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ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
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elems->ht_cap_elem,
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&sta->sta.ht_cap);
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else
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memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap));
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rate_control_rate_init(sta);
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spin_unlock_bh(&sta->lock);
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return sta;
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}
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void mesh_neighbour_update(u8 *hw_addr, u32 rates,
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struct ieee80211_sub_if_data *sdata,
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struct ieee802_11_elems *elems)
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{
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struct sta_info *sta;
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/* Userspace handles peer allocation when security is enabled */
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if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
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cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr,
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elems->ie_start,
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elems->total_len,
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GFP_KERNEL);
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return;
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}
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rcu_read_lock();
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sta = mesh_peer_init(sdata, hw_addr, rates, elems);
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if (!sta)
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goto out;
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if (mesh_peer_accepts_plinks(elems) &&
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sta->plink_state == NL80211_PLINK_LISTEN &&
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sdata->u.mesh.accepting_plinks &&
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sdata->u.mesh.mshcfg.auto_open_plinks &&
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rssi_threshold_check(sta, sdata))
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sta->plink_state == NL80211_PLINK_LISTEN &&
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sdata->u.mesh.accepting_plinks &&
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sdata->u.mesh.mshcfg.auto_open_plinks &&
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rssi_threshold_check(sta, sdata))
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mesh_plink_open(sta);
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out:
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rcu_read_unlock();
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}
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@ -587,26 +610,13 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m
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return;
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} else if (!sta) {
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/* ftype == WLAN_SP_MESH_PEERING_OPEN */
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rcu_read_unlock();
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if (!mesh_plink_free_count(sdata)) {
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mpl_dbg("Mesh plink error: no more free plinks\n");
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return;
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}
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sta = mesh_plink_alloc(sdata, mgmt->sa, rates, &elems);
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if (!sta) {
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mpl_dbg("Mesh plink error: plink table full\n");
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return;
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}
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if (sta_info_insert_rcu(sta)) {
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rcu_read_unlock();
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return;
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}
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event = OPN_ACPT;
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spin_lock_bh(&sta->lock);
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} else if (matches_local) {
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spin_lock_bh(&sta->lock);
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switch (ftype) {
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case WLAN_SP_MESH_PEERING_OPEN:
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if (!mesh_plink_free_count(sdata) ||
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@ -643,12 +653,19 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m
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break;
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default:
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mpl_dbg("Mesh plink: unknown frame subtype\n");
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spin_unlock_bh(&sta->lock);
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rcu_read_unlock();
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return;
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}
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} else {
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spin_lock_bh(&sta->lock);
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}
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if (event == OPN_ACPT) {
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/* allocate sta entry if necessary and update info */
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sta = mesh_peer_init(sdata, mgmt->sa, rates, &elems);
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if (!sta) {
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mpl_dbg("Mesh plink: failed to init peer!\n");
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rcu_read_unlock();
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return;
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}
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}
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mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
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@ -656,6 +673,7 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m
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le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
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event);
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reason = 0;
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spin_lock_bh(&sta->lock);
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switch (sta->plink_state) {
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/* spin_unlock as soon as state is updated at each case */
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case NL80211_PLINK_LISTEN:
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