mac80211: merge a few mesh fixes

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48647 3c298f89-4303-0410-b956-a3cf2f4a3e73

3 files changed, 301 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/327-mac80211-Remove-MPP-table-entries-with-MPath.patch b/package/kernel/mac80211/patches/327-mac80211-Remove-MPP-table-entries-with-MPath.patch
new file mode 100644
index 0000000000..f7f9df946a
--- /dev/null
+++ b/package/kernel/mac80211/patches/327-mac80211-Remove-MPP-table-entries-with-MPath.patch
@@ -0,0 +1,54 @@
+From: Henning Rogge <hrogge@gmail.com>
+Date: Wed, 3 Feb 2016 13:58:36 +0100
+Subject: [PATCH] mac80211: Remove MPP table entries with MPath
+
+Make the mesh_path_del() function remove all mpp table entries
+that are proxied by the removed mesh path.
+
+Acked-by: Bob Copeland <me@bobcopeland.com>
+Signed-off-by: Henning Rogge <henning.rogge@fkie.fraunhofer.de>
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/mesh_pathtbl.c
++++ b/net/mac80211/mesh_pathtbl.c
+@@ -835,6 +835,29 @@ void mesh_path_flush_by_nexthop(struct s
+ 	rcu_read_unlock();
+ }
+ 
++static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata,
++			       const u8 *proxy)
++{
++	struct mesh_table *tbl;
++	struct mesh_path *mpp;
++	struct mpath_node *node;
++	int i;
++
++	rcu_read_lock();
++	read_lock_bh(&pathtbl_resize_lock);
++	tbl = resize_dereference_mpp_paths();
++	for_each_mesh_entry(tbl, node, i) {
++		mpp = node->mpath;
++		if (ether_addr_equal(mpp->mpp, proxy)) {
++			spin_lock(&tbl->hashwlock[i]);
++			__mesh_path_del(tbl, node);
++			spin_unlock(&tbl->hashwlock[i]);
++		}
++	}
++	read_unlock_bh(&pathtbl_resize_lock);
++	rcu_read_unlock();
++}
++
+ static void table_flush_by_iface(struct mesh_table *tbl,
+ 				 struct ieee80211_sub_if_data *sdata)
+ {
+@@ -892,6 +915,9 @@ int mesh_path_del(struct ieee80211_sub_i
+ 	int hash_idx;
+ 	int err = 0;
+ 
++	/* flush relevant mpp entries first */
++	mpp_flush_by_proxy(sdata, addr);
++
+ 	read_lock_bh(&pathtbl_resize_lock);
+ 	tbl = resize_dereference_mesh_paths();
+ 	hash_idx = mesh_table_hash(addr, sdata, tbl);
diff --git a/package/kernel/mac80211/patches/328-mac80211-let-unused-MPP-table-entries-timeout.patch b/package/kernel/mac80211/patches/328-mac80211-let-unused-MPP-table-entries-timeout.patch
new file mode 100644
index 0000000000..740993c9e0
--- /dev/null
+++ b/package/kernel/mac80211/patches/328-mac80211-let-unused-MPP-table-entries-timeout.patch
@@ -0,0 +1,104 @@
+From: Henning Rogge <hrogge@gmail.com>
+Date: Wed, 3 Feb 2016 13:58:37 +0100
+Subject: [PATCH] mac80211: let unused MPP table entries timeout
+
+Remember the last time when a mpp table entry is used for
+rx or tx and remove them after MESH_PATH_EXPIRE time.
+
+Acked-by: Bob Copeland <me@bobcopeland.com>
+Signed-off-by: Henning Rogge <henning.rogge@fkie.fraunhofer.de>
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/mesh_pathtbl.c
++++ b/net/mac80211/mesh_pathtbl.c
+@@ -942,6 +942,46 @@ enddel:
+ }
+ 
+ /**
++ * mpp_path_del - delete a mesh proxy path from the table
++ *
++ * @addr: addr address (ETH_ALEN length)
++ * @sdata: local subif
++ *
++ * Returns: 0 if successful
++ */
++static int mpp_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
++{
++	struct mesh_table *tbl;
++	struct mesh_path *mpath;
++	struct mpath_node *node;
++	struct hlist_head *bucket;
++	int hash_idx;
++	int err = 0;
++
++	read_lock_bh(&pathtbl_resize_lock);
++	tbl = resize_dereference_mpp_paths();
++	hash_idx = mesh_table_hash(addr, sdata, tbl);
++	bucket = &tbl->hash_buckets[hash_idx];
++
++	spin_lock(&tbl->hashwlock[hash_idx]);
++	hlist_for_each_entry(node, bucket, list) {
++		mpath = node->mpath;
++		if (mpath->sdata == sdata &&
++		    ether_addr_equal(addr, mpath->dst)) {
++			__mesh_path_del(tbl, node);
++			goto enddel;
++		}
++	}
++
++	err = -ENXIO;
++enddel:
++	mesh_paths_generation++;
++	spin_unlock(&tbl->hashwlock[hash_idx]);
++	read_unlock_bh(&pathtbl_resize_lock);
++	return err;
++}
++
++/**
+  * mesh_path_tx_pending - sends pending frames in a mesh path queue
+  *
+  * @mpath: mesh path to activate
+@@ -1157,6 +1197,17 @@ void mesh_path_expire(struct ieee80211_s
+ 		     time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))
+ 			mesh_path_del(mpath->sdata, mpath->dst);
+ 	}
++
++	tbl = rcu_dereference(mpp_paths);
++	for_each_mesh_entry(tbl, node, i) {
++		if (node->mpath->sdata != sdata)
++			continue;
++		mpath = node->mpath;
++		if ((!(mpath->flags & MESH_PATH_FIXED)) &&
++		    time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))
++			mpp_path_del(mpath->sdata, mpath->dst);
++	}
++
+ 	rcu_read_unlock();
+ }
+ 
+--- a/net/mac80211/rx.c
++++ b/net/mac80211/rx.c
+@@ -2291,6 +2291,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
+ 			spin_lock_bh(&mppath->state_lock);
+ 			if (!ether_addr_equal(mppath->mpp, mpp_addr))
+ 				memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
++			mppath->exp_time = jiffies;
+ 			spin_unlock_bh(&mppath->state_lock);
+ 		}
+ 		rcu_read_unlock();
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -2171,8 +2171,11 @@ static struct sk_buff *ieee80211_build_h
+ 					mpp_lookup = true;
+ 			}
+ 
+-			if (mpp_lookup)
++			if (mpp_lookup) {
+ 				mppath = mpp_path_lookup(sdata, skb->data);
++				if (mppath)
++					mppath->exp_time = jiffies;
++			}
+ 
+ 			if (mppath && mpath)
+ 				mesh_path_del(mpath->sdata, mpath->dst);
diff --git a/package/kernel/mac80211/patches/329-mac80211-Unify-mesh-and-mpp-path-removal-function.patch b/package/kernel/mac80211/patches/329-mac80211-Unify-mesh-and-mpp-path-removal-function.patch
new file mode 100644
index 0000000000..0c36b1d568
--- /dev/null
+++ b/package/kernel/mac80211/patches/329-mac80211-Unify-mesh-and-mpp-path-removal-function.patch
@@ -0,0 +1,143 @@
+From: Henning Rogge <hrogge@gmail.com>
+Date: Wed, 3 Feb 2016 13:58:38 +0100
+Subject: [PATCH] mac80211: Unify mesh and mpp path removal function
+
+mpp_path_del() and mesh_path_del() are mostly the same function.
+Move common code into a new static function.
+
+Acked-by: Bob Copeland <me@bobcopeland.com>
+Signed-off-by: Henning Rogge <henning.rogge@fkie.fraunhofer.de>
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/mesh_pathtbl.c
++++ b/net/mac80211/mesh_pathtbl.c
+@@ -55,16 +55,21 @@ int mpp_paths_generation;
+ static DEFINE_RWLOCK(pathtbl_resize_lock);
+ 
+ 
++static inline struct mesh_table *resize_dereference_paths(
++	struct mesh_table __rcu *table)
++{
++	return rcu_dereference_protected(table,
++					lockdep_is_held(&pathtbl_resize_lock));
++}
++
+ static inline struct mesh_table *resize_dereference_mesh_paths(void)
+ {
+-	return rcu_dereference_protected(mesh_paths,
+-		lockdep_is_held(&pathtbl_resize_lock));
++	return resize_dereference_paths(mesh_paths);
+ }
+ 
+ static inline struct mesh_table *resize_dereference_mpp_paths(void)
+ {
+-	return rcu_dereference_protected(mpp_paths,
+-		lockdep_is_held(&pathtbl_resize_lock));
++	return resize_dereference_paths(mpp_paths);
+ }
+ 
+ /*
+@@ -899,14 +904,17 @@ void mesh_path_flush_by_iface(struct iee
+ }
+ 
+ /**
+- * mesh_path_del - delete a mesh path from the table
++ * table_path_del - delete a path from the mesh or mpp table
+  *
+- * @addr: dst address (ETH_ALEN length)
++ * @tbl: mesh or mpp path table
+  * @sdata: local subif
++ * @addr: dst address (ETH_ALEN length)
+  *
+  * Returns: 0 if successful
+  */
+-int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
++static int table_path_del(struct mesh_table __rcu *rcu_tbl,
++			  struct ieee80211_sub_if_data *sdata,
++			  const u8 *addr)
+ {
+ 	struct mesh_table *tbl;
+ 	struct mesh_path *mpath;
+@@ -915,11 +923,7 @@ int mesh_path_del(struct ieee80211_sub_i
+ 	int hash_idx;
+ 	int err = 0;
+ 
+-	/* flush relevant mpp entries first */
+-	mpp_flush_by_proxy(sdata, addr);
+-
+-	read_lock_bh(&pathtbl_resize_lock);
+-	tbl = resize_dereference_mesh_paths();
++	tbl = resize_dereference_paths(rcu_tbl);
+ 	hash_idx = mesh_table_hash(addr, sdata, tbl);
+ 	bucket = &tbl->hash_buckets[hash_idx];
+ 
+@@ -935,9 +939,30 @@ int mesh_path_del(struct ieee80211_sub_i
+ 
+ 	err = -ENXIO;
+ enddel:
+-	mesh_paths_generation++;
+ 	spin_unlock(&tbl->hashwlock[hash_idx]);
++	return err;
++}
++
++/**
++ * mesh_path_del - delete a mesh path from the table
++ *
++ * @addr: dst address (ETH_ALEN length)
++ * @sdata: local subif
++ *
++ * Returns: 0 if successful
++ */
++int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
++{
++	int err = 0;
++
++	/* flush relevant mpp entries first */
++	mpp_flush_by_proxy(sdata, addr);
++
++	read_lock_bh(&pathtbl_resize_lock);
++	err = table_path_del(mesh_paths, sdata, addr);
++	mesh_paths_generation++;
+ 	read_unlock_bh(&pathtbl_resize_lock);
++
+ 	return err;
+ }
+ 
+@@ -951,33 +976,13 @@ enddel:
+  */
+ static int mpp_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
+ {
+-	struct mesh_table *tbl;
+-	struct mesh_path *mpath;
+-	struct mpath_node *node;
+-	struct hlist_head *bucket;
+-	int hash_idx;
+ 	int err = 0;
+ 
+ 	read_lock_bh(&pathtbl_resize_lock);
+-	tbl = resize_dereference_mpp_paths();
+-	hash_idx = mesh_table_hash(addr, sdata, tbl);
+-	bucket = &tbl->hash_buckets[hash_idx];
+-
+-	spin_lock(&tbl->hashwlock[hash_idx]);
+-	hlist_for_each_entry(node, bucket, list) {
+-		mpath = node->mpath;
+-		if (mpath->sdata == sdata &&
+-		    ether_addr_equal(addr, mpath->dst)) {
+-			__mesh_path_del(tbl, node);
+-			goto enddel;
+-		}
+-	}
+-
+-	err = -ENXIO;
+-enddel:
+-	mesh_paths_generation++;
+-	spin_unlock(&tbl->hashwlock[hash_idx]);
++	err = table_path_del(mpp_paths, sdata, addr);
++	mpp_paths_generation++;
+ 	read_unlock_bh(&pathtbl_resize_lock);
++
+ 	return err;
+ }
+