diff options
Diffstat (limited to 'target/linux/generic/patches-4.3/643-bridge_remove_ipv6_dependency.patch')
| -rw-r--r-- | target/linux/generic/patches-4.3/643-bridge_remove_ipv6_dependency.patch | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.3/643-bridge_remove_ipv6_dependency.patch b/target/linux/generic/patches-4.3/643-bridge_remove_ipv6_dependency.patch new file mode 100644 index 0000000..ee5c244 --- /dev/null +++ b/target/linux/generic/patches-4.3/643-bridge_remove_ipv6_dependency.patch @@ -0,0 +1,123 @@ +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 +@@ -122,6 +122,12 @@ static inline int addrconf_ifid_eui48(u8 + return 0; + } + ++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 +@@ -46,6 +46,7 @@ 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 +@@ -1509,7 +1509,7 @@ out: + return hiscore_idx; + } + +-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) + { +@@ -1579,7 +1579,6 @@ int ipv6_dev_get_saddr(struct net *net, + 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) +@@ -5941,6 +5940,9 @@ 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); +@@ -5960,6 +5962,9 @@ 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); ++ |