openwrt/target/linux/generic/patches-3.14/643-bridge_remove_ipv6_dependency.patch

--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -88,6 +88,12 @@ int ipv6_rcv_saddr_equal(const struct so
 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 
+extern int			(*ipv6_dev_get_saddr_hook)(struct net *net,
+						const struct net_device *dev,
+						const struct in6_addr *daddr,
+						unsigned int prefs,
+						struct in6_addr *saddr);
+
 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 						   unsigned int unit)
 {
--- a/net/bridge/Kconfig
+++ b/net/bridge/Kconfig
@@ -6,7 +6,6 @@ config BRIDGE
 	tristate "802.1d Ethernet Bridging"
 	select LLC
 	select STP
-	depends on IPV6 || IPV6=n
 	---help---
 	  If you say Y here, then your Linux box will be able to act as an
 	  Ethernet bridge, which means that the different Ethernet segments it
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -45,3 +45,4 @@ obj-y += addrconf_core.o exthdrs_core.o
 obj-$(CONFIG_INET) += output_core.o protocol.o $(ipv6-offload)
 
 obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
+obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_stubs.o
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1311,7 +1311,7 @@ out:
 	return ret;
 }
 
-int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
+static int __ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
 		       const struct in6_addr *daddr, unsigned int prefs,
 		       struct in6_addr *saddr)
 {
@@ -1436,7 +1436,6 @@ try_nextdev:
 	in6_ifa_put(hiscore->ifa);
 	return 0;
 }
-EXPORT_SYMBOL(ipv6_dev_get_saddr);
 
 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 		      u32 banned_flags)
@@ -5380,6 +5379,9 @@ int __init addrconf_init(void)
 
 	ipv6_addr_label_rtnl_register();
 
+	BUG_ON(ipv6_dev_get_saddr_hook != NULL);
+	rcu_assign_pointer(ipv6_dev_get_saddr_hook, __ipv6_dev_get_saddr);
+
 	return 0;
 errout:
 	rtnl_af_unregister(&inet6_ops);
@@ -5399,6 +5401,9 @@ void addrconf_cleanup(void)
 	struct net_device *dev;
 	int i;
 
+	rcu_assign_pointer(ipv6_dev_get_saddr_hook, NULL);
+	synchronize_rcu();
+
 	unregister_netdevice_notifier(&ipv6_dev_notf);
 	unregister_pernet_subsys(&addrconf_ops);
 	ipv6_addr_label_cleanup();
--- /dev/null
+++ b/net/ipv6/inet6_stubs.c
@@ -0,0 +1,33 @@
+/*
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+#include <linux/export.h>
+#include <net/ipv6.h>
+
+int (*ipv6_dev_get_saddr_hook)(struct net *net, const struct net_device *dev,
+			const struct in6_addr *daddr, unsigned int prefs,
+			struct in6_addr *saddr);
+
+EXPORT_SYMBOL(ipv6_dev_get_saddr_hook);
+
+int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
+			const struct in6_addr *daddr, unsigned int prefs,
+			struct in6_addr *saddr)
+{
+	int ret = -EADDRNOTAVAIL;
+	typeof(ipv6_dev_get_saddr_hook) dev_get_saddr;
+
+	rcu_read_lock();
+	dev_get_saddr = rcu_dereference(ipv6_dev_get_saddr_hook);
+
+	if (dev_get_saddr)
+		ret = dev_get_saddr(net, dst_dev, daddr, prefs, saddr);
+
+	rcu_read_unlock();
+	return ret;
+}
+EXPORT_SYMBOL(ipv6_dev_get_saddr);
+