1 files changed, 39 insertions, 31 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 5bd120e4bc0a..54271ed0ed45 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -136,7 +136,7 @@ struct fib_result {
 	u32		tclassid;
 	struct fib_info *fi;
 	struct fib_table *table;
-	struct list_head *fa_head;
+	struct hlist_head *fa_head;
 };
 
 struct fib_result_nl {
@@ -185,7 +185,9 @@ struct fib_table {
 	u32			tb_id;
 	int			tb_default;
 	int			tb_num_default;
-	unsigned long		tb_data[0];
+	struct rcu_head		rcu;
+	unsigned long 		*tb_data;
+	unsigned long		__data[0];
 };
 
 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
@@ -195,10 +197,10 @@ int fib_table_delete(struct fib_table *, struct fib_config *);
 int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
 		   struct netlink_callback *cb);
 int fib_table_flush(struct fib_table *table);
+struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
+void fib_table_flush_external(struct fib_table *table);
 void fib_free_table(struct fib_table *tb);
 
-
-
 #ifndef CONFIG_IP_MULTIPLE_TABLES
 
 #define TABLE_LOCAL_INDEX	(RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
@@ -206,12 +208,16 @@ void fib_free_table(struct fib_table *tb);
 
 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
 {
+	struct hlist_node *tb_hlist;
 	struct hlist_head *ptr;
 
 	ptr = id == RT_TABLE_LOCAL ?
 		&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
 		&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
-	return hlist_entry(ptr->first, struct fib_table, tb_hlist);
+
+	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
+
+	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
 }
 
 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
@@ -222,14 +228,13 @@ static inline struct fib_table *fib_new_table(struct net *net, u32 id)
 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
 			     struct fib_result *res)
 {
+	struct fib_table *tb;
 	int err = -ENETUNREACH;
 
 	rcu_read_lock();
 
-	if (!fib_table_lookup(fib_get_table(net, RT_TABLE_LOCAL), flp, res,
-			      FIB_LOOKUP_NOREF) ||
-	    !fib_table_lookup(fib_get_table(net, RT_TABLE_MAIN), flp, res,
-			      FIB_LOOKUP_NOREF))
+	tb = fib_get_table(net, RT_TABLE_MAIN);
+	if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
 		err = 0;
 
 	rcu_read_unlock();
@@ -249,28 +254,29 @@ int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res);
 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
 			     struct fib_result *res)
 {
-	if (!net->ipv4.fib_has_custom_rules) {
-		int err = -ENETUNREACH;
-
-		rcu_read_lock();
-
-		res->tclassid = 0;
-		if ((net->ipv4.fib_local &&
-		     !fib_table_lookup(net->ipv4.fib_local, flp, res,
-				       FIB_LOOKUP_NOREF)) ||
-		    (net->ipv4.fib_main &&
-		     !fib_table_lookup(net->ipv4.fib_main, flp, res,
-				       FIB_LOOKUP_NOREF)) ||
-		    (net->ipv4.fib_default &&
-		     !fib_table_lookup(net->ipv4.fib_default, flp, res,
-				       FIB_LOOKUP_NOREF)))
-			err = 0;
-
-		rcu_read_unlock();
-
-		return err;
+	struct fib_table *tb;
+	int err;
+
+	if (net->ipv4.fib_has_custom_rules)
+		return __fib_lookup(net, flp, res);
+
+	rcu_read_lock();
+
+	res->tclassid = 0;
+
+	for (err = 0; !err; err = -ENETUNREACH) {
+		tb = rcu_dereference_rtnl(net->ipv4.fib_main);
+		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
+			break;
+
+		tb = rcu_dereference_rtnl(net->ipv4.fib_default);
+		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
+			break;
 	}
-	return __fib_lookup(net, flp, res);
+
+	rcu_read_unlock();
+
+	return err;
 }
 
 #endif /* CONFIG_IP_MULTIPLE_TABLES */
@@ -294,6 +300,8 @@ static inline int fib_num_tclassid_users(struct net *net)
 	return 0;
 }
 #endif
+int fib_unmerge(struct net *net);
+void fib_flush_external(struct net *net);
 
 /* Exported by fib_semantics.c */
 int ip_fib_check_default(__be32 gw, struct net_device *dev);
@@ -304,7 +312,7 @@ void fib_select_multipath(struct fib_result *res);
 
 /* Exported by fib_trie.c */
 void fib_trie_init(void);
-struct fib_table *fib_trie_table(u32 id);
+struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
 
 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
 {