generic: Remove IPv6 depependency of bridge in 2.6.38+ Since 2.6.38 the bridge module...

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.

Signed-off-by: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
SVN-Revision: 27237

diff --git a/target/linux/generic/patches-2.6.38/643-bridge_remove_ipv6_dependency.patch b/target/linux/generic/patches-2.6.38/643-bridge_remove_ipv6_dependency.patch
new file mode 100644 (file)
index 0000000..7f4f754
--- /dev/null
+++ b/target/linux/generic/patches-2.6.38/643-bridge_remove_ipv6_dependency.patch
@@ -0,0 +1,101 @@
+--- a/include/net/addrconf.h
++++ b/include/net/addrconf.h
+@@ -93,6 +93,12 @@ extern void                 addrconf_join_solict(struc
+ extern void                   addrconf_leave_solict(struct inet6_dev *idev,
+                                       struct in6_addr *addr);
+ 
++extern int                    (*ipv6_dev_get_saddr_hook)(struct net *net,
++                                              struct net_device *dev,
++                                              const struct in6_addr *daddr,
++                                              unsigned int srcprefs,
++                                              struct in6_addr *saddr);
++
+ static inline unsigned long addrconf_timeout_fixup(u32 timeout,
+                                                   unsigned 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
+@@ -40,3 +40,4 @@ obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.
+ obj-y += addrconf_core.o exthdrs_core.o
+ 
+ obj-$(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
+@@ -1119,7 +1119,7 @@ out:
+       return ret;
+ }
+ 
+-int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
++static int __ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
+                      const struct in6_addr *daddr, unsigned int prefs,
+                      struct in6_addr *saddr)
+ {
+@@ -1244,7 +1244,6 @@ try_nextdev:
+       in6_ifa_put(hiscore->ifa);
+       return 0;
+ }
+-EXPORT_SYMBOL(ipv6_dev_get_saddr);
+ 
+ int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
+                   unsigned char banned_flags)
+@@ -4718,6 +4717,9 @@ 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);
+@@ -4736,6 +4738,9 @@ 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 +1,27 @@
++/*
++ *      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 <net/ipv6.h>
++
++int (*ipv6_dev_get_saddr_hook)(struct net *net, struct net_device *dev,
++                      const struct in6_addr *daddr, unsigned int srcprefs,
++                      struct in6_addr *saddr);
++
++EXPORT_SYMBOL(ipv6_dev_get_saddr_hook);
++
++int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
++                      const struct in6_addr *daddr, unsigned int prefs,
++                      struct in6_addr *saddr)
++{
++      typeof(ipv6_dev_get_saddr_hook) dev_get_saddr = rcu_dereference(ipv6_dev_get_saddr_hook);
++
++      if (dev_get_saddr)
++              return dev_get_saddr(net, dst_dev, daddr, prefs, saddr);
++
++      return -EADDRNOTAVAIL;
++}
++EXPORT_SYMBOL(ipv6_dev_get_saddr);
++

diff --git a/target/linux/generic/patches-2.6.39/643-bridge_remove_ipv6_dependency.patch b/target/linux/generic/patches-2.6.39/643-bridge_remove_ipv6_dependency.patch
new file mode 100644 (file)
index 0000000..679561e
--- /dev/null
+++ b/target/linux/generic/patches-2.6.39/643-bridge_remove_ipv6_dependency.patch
@@ -0,0 +1,101 @@
+--- a/include/net/addrconf.h
++++ b/include/net/addrconf.h
+@@ -93,6 +93,12 @@ extern void                 addrconf_join_solict(struc
+ extern void                   addrconf_leave_solict(struct inet6_dev *idev,
+                                       struct in6_addr *addr);
+ 
++extern int                    (*ipv6_dev_get_saddr_hook)(struct net *net,
++                                              struct net_device *dev,
++                                              const struct in6_addr *daddr,
++                                              unsigned int srcprefs,
++                                              struct in6_addr *saddr);
++
+ static inline unsigned long addrconf_timeout_fixup(u32 timeout,
+                                                   unsigned 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
+@@ -40,3 +40,4 @@ obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.
+ obj-y += addrconf_core.o exthdrs_core.o
+ 
+ obj-$(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
+@@ -1116,7 +1116,7 @@ out:
+       return ret;
+ }
+ 
+-int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
++static int __ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
+                      const struct in6_addr *daddr, unsigned int prefs,
+                      struct in6_addr *saddr)
+ {
+@@ -1241,7 +1241,6 @@ try_nextdev:
+       in6_ifa_put(hiscore->ifa);
+       return 0;
+ }
+-EXPORT_SYMBOL(ipv6_dev_get_saddr);
+ 
+ int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
+                   unsigned char banned_flags)
+@@ -4715,6 +4714,9 @@ 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);
+@@ -4733,6 +4735,9 @@ 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 +1,27 @@
++/*
++ *      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 <net/ipv6.h>
++
++int (*ipv6_dev_get_saddr_hook)(struct net *net, struct net_device *dev,
++                      const struct in6_addr *daddr, unsigned int srcprefs,
++                      struct in6_addr *saddr);
++
++EXPORT_SYMBOL(ipv6_dev_get_saddr_hook);
++
++int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
++                      const struct in6_addr *daddr, unsigned int prefs,
++                      struct in6_addr *saddr)
++{
++      typeof(ipv6_dev_get_saddr_hook) dev_get_saddr = rcu_dereference(ipv6_dev_get_saddr_hook);
++
++      if (dev_get_saddr)
++              return dev_get_saddr(net, dst_dev, daddr, prefs, saddr);
++
++      return -EADDRNOTAVAIL;
++}
++EXPORT_SYMBOL(ipv6_dev_get_saddr);
++

diff --git a/target/linux/generic/patches-3.0/643-bridge_remove_ipv6_dependency.patch b/target/linux/generic/patches-3.0/643-bridge_remove_ipv6_dependency.patch
new file mode 100644 (file)
index 0000000..5eac489
--- /dev/null
+++ b/target/linux/generic/patches-3.0/643-bridge_remove_ipv6_dependency.patch
@@ -0,0 +1,101 @@
+--- a/include/net/addrconf.h
++++ b/include/net/addrconf.h
+@@ -91,6 +91,12 @@ extern void                 addrconf_join_solict(struc
+ extern void                   addrconf_leave_solict(struct inet6_dev *idev,
+                                       const struct in6_addr *addr);
+ 
++extern int                    (*ipv6_dev_get_saddr_hook)(struct net *net,
++                                              struct net_device *dev,
++                                              const struct in6_addr *daddr,
++                                              unsigned int srcprefs,
++                                              struct in6_addr *saddr);
++
+ static inline unsigned long addrconf_timeout_fixup(u32 timeout,
+                                                   unsigned 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
+@@ -40,3 +40,4 @@ obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.
+ obj-y += addrconf_core.o exthdrs_core.o
+ 
+ obj-$(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
+@@ -1106,7 +1106,7 @@ out:
+       return ret;
+ }
+ 
+-int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
++static int __ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
+                      const struct in6_addr *daddr, unsigned int prefs,
+                      struct in6_addr *saddr)
+ {
+@@ -1231,7 +1231,6 @@ try_nextdev:
+       in6_ifa_put(hiscore->ifa);
+       return 0;
+ }
+-EXPORT_SYMBOL(ipv6_dev_get_saddr);
+ 
+ int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
+                   unsigned char banned_flags)
+@@ -4705,6 +4704,9 @@ 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);
+@@ -4723,6 +4725,9 @@ 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 +1,27 @@
++/*
++ *      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 <net/ipv6.h>
++
++int (*ipv6_dev_get_saddr_hook)(struct net *net, struct net_device *dev,
++                      const struct in6_addr *daddr, unsigned int srcprefs,
++                      struct in6_addr *saddr);
++
++EXPORT_SYMBOL(ipv6_dev_get_saddr_hook);
++
++int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
++                      const struct in6_addr *daddr, unsigned int prefs,
++                      struct in6_addr *saddr)
++{
++      typeof(ipv6_dev_get_saddr_hook) dev_get_saddr = rcu_dereference(ipv6_dev_get_saddr_hook);
++
++      if (dev_get_saddr)
++              return dev_get_saddr(net, dst_dev, daddr, prefs, saddr);
++
++      return -EADDRNOTAVAIL;
++}
++EXPORT_SYMBOL(ipv6_dev_get_saddr);
++