kernel: drop bridge hack for removing ipv6 dependency

Now that IPV6 isn't build as a module anymore, we don't need to decouple
bridge from ipv6 anymore.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 47751

1 files changed, 0 insertions, 123 deletions

diff --git a/target/linux/generic/patches-4.1/643-bridge_remove_ipv6_dependency.patch b/target/linux/generic/patches-4.1/643-bridge_remove_ipv6_dependency.patch
deleted file mode 100644
index b18f33e962..0000000000
--- a/target/linux/generic/patches-4.1/643-bridge_remove_ipv6_dependency.patch
+++ /dev/null
@@ -1,123 +0,0 @@
-From: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
-Subject: [PATCH] bridge: remove IPv6 depependency of bridge in 2.6.38+
-
-Since 2.6.38 the bridge module has a dependency to IPv6 if IPv6 is
-enabled. Since the IPv6 module isn't exactly lightweight and bridge also
-only needs a single function from IPv6, it's rather easy to create a
-common "lib" module with a RCU pointer to the actual implementation, if
-the IPv6 module is loaded (although slightly hackish).
-
-The codepath seems to be only taken when using IPv6, so there should be
-no negative side effects when IPv6 isn't loaded. I did not measure how
-big the performance impact is.
----
---- a/include/net/addrconf.h
-+++ b/include/net/addrconf.h
-@@ -91,6 +91,12 @@ 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
-@@ -45,6 +45,7 @@ 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,$(CONFIG_IPV6)) += inet6_stubs.o
- 
- ifneq ($(CONFIG_IPV6),)
- obj-$(CONFIG_NET_UDP_TUNNEL) += ip6_udp_tunnel.o
---- a/net/ipv6/addrconf.c
-+++ b/net/ipv6/addrconf.c
-@@ -1358,7 +1358,7 @@ 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)
- {
-@@ -1481,7 +1481,6 @@ 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)
-@@ -5810,6 +5809,9 @@ 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);
-@@ -5829,6 +5831,9 @@ 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);
-+