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mac80211: Remove mesh paths when an interface is removed

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When an interface is removed, the mesh paths associated with it should
also be removed.

This fixes a bug we observed when reloading a device driver module
without reloading mac80211s.

Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Javier Cardona 2011-08-29 13:23:04 -07:00 committed by John W. Linville
parent af089c15cb
commit ece1a2e7e8
4 changed files with 47 additions and 3 deletions
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2
net/mac80211/cfg.c
View file

@ -921,7 +921,7 @@ static int ieee80211_del_mpath(struct wiphy *wiphy, struct net_device *dev,
if (dst)
return mesh_path_del(dst, sdata);
mesh_path_flush(sdata);
mesh_path_flush_by_iface(sdata);
return 0;
}

6
net/mac80211/iface.c
View file

@ -1214,6 +1214,9 @@ void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
list_del_rcu(&sdata->list);
mutex_unlock(&sdata->local->iflist_mtx);
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_path_flush_by_iface(sdata);
synchronize_rcu();
unregister_netdevice(sdata->dev);
}
@ -1233,6 +1236,9 @@ void ieee80211_remove_interfaces(struct ieee80211_local *local)
list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
list_del(&sdata->list);
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_path_flush_by_iface(sdata);
unregister_netdevice_queue(sdata->dev, &unreg_list);
}
mutex_unlock(&local->iflist_mtx);

2
net/mac80211/mesh.h
View file

@ -238,7 +238,6 @@ struct mesh_path *mesh_path_lookup_by_idx(int idx,
struct ieee80211_sub_if_data *sdata);
void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
void mesh_path_flush(struct ieee80211_sub_if_data *sdata);
void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len);
int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata);
@ -275,6 +274,7 @@ void mesh_pathtbl_unregister(void);
int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata);
void mesh_path_timer(unsigned long data);
void mesh_path_flush_by_nexthop(struct sta_info *sta);
void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata);
void mesh_path_discard_frame(struct sk_buff *skb,
struct ieee80211_sub_if_data *sdata);
void mesh_path_quiesce(struct ieee80211_sub_if_data *sdata);

40
net/mac80211/mesh_pathtbl.c
View file

@ -821,7 +821,7 @@ void mesh_path_flush_by_nexthop(struct sta_info *sta)
rcu_read_unlock();
}
void mesh_path_flush(struct ieee80211_sub_if_data *sdata)
static void mesh_path_flush(struct ieee80211_sub_if_data *sdata)
{
struct mesh_table *tbl;
struct mesh_path *mpath;
@ -850,6 +850,44 @@ static void mesh_path_node_reclaim(struct rcu_head *rp)
kfree(node);
}
static void mpp_path_flush(struct ieee80211_sub_if_data *sdata)
{
struct mesh_table *tbl;
struct mesh_path *mpath;
struct mpath_node *node;
struct hlist_node *p;
int i;
read_lock_bh(&pathtbl_resize_lock);
tbl = rcu_dereference_protected(mpp_paths,
lockdep_is_held(pathtbl_resize_lock));
for_each_mesh_entry(tbl, p, node, i) {
mpath = node->mpath;
if (mpath->sdata != sdata)
continue;
spin_lock_bh(&tbl->hashwlock[i]);
spin_lock_bh(&mpath->state_lock);
call_rcu(&node->rcu, mesh_path_node_reclaim);
atomic_dec(&tbl->entries);
spin_unlock_bh(&tbl->hashwlock[i]);
}
read_unlock_bh(&pathtbl_resize_lock);
}
/**
* mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface
*
* This function deletes both mesh paths as well as mesh portal paths.
*
* @sdata - interface data to match
*
*/
void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
{
mesh_path_flush(sdata);
mpp_path_flush(sdata);
}
/**
* mesh_path_del - delete a mesh path from the table
*