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123 lines
3.9 KiB
123 lines
3.9 KiB
From: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
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Subject: [PATCH] bridge: remove IPv6 depependency of bridge in 2.6.38+
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Since 2.6.38 the bridge module has a dependency to IPv6 if IPv6 is
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enabled. Since the IPv6 module isn't exactly lightweight and bridge also
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only needs a single function from IPv6, it's rather easy to create a
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common "lib" module with a RCU pointer to the actual implementation, if
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the IPv6 module is loaded (although slightly hackish).
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The codepath seems to be only taken when using IPv6, so there should be
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no negative side effects when IPv6 isn't loaded. I did not measure how
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big the performance impact is.
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---
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--- a/include/net/addrconf.h
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+++ b/include/net/addrconf.h
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@@ -122,6 +122,12 @@ static inline int addrconf_ifid_eui48(u8
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return 0;
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}
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+extern int (*ipv6_dev_get_saddr_hook)(struct net *net,
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+ const struct net_device *dev,
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+ const struct in6_addr *daddr,
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+ unsigned int prefs,
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+ struct in6_addr *saddr);
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+
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static inline unsigned long addrconf_timeout_fixup(u32 timeout,
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unsigned int unit)
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{
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--- a/net/bridge/Kconfig
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+++ b/net/bridge/Kconfig
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@@ -6,7 +6,6 @@ config BRIDGE
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tristate "802.1d Ethernet Bridging"
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select LLC
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select STP
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- depends on IPV6 || IPV6=n
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---help---
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If you say Y here, then your Linux box will be able to act as an
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Ethernet bridge, which means that the different Ethernet segments it
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--- a/net/ipv6/Makefile
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+++ b/net/ipv6/Makefile
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@@ -46,6 +46,7 @@ obj-y += addrconf_core.o exthdrs_core.o
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obj-$(CONFIG_INET) += output_core.o protocol.o $(ipv6-offload)
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obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
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+obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_stubs.o
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ifneq ($(CONFIG_IPV6),)
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obj-$(CONFIG_NET_UDP_TUNNEL) += ip6_udp_tunnel.o
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--- a/net/ipv6/addrconf.c
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+++ b/net/ipv6/addrconf.c
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@@ -1509,7 +1509,7 @@ out:
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return hiscore_idx;
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}
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-int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
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+static int ___ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
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const struct in6_addr *daddr, unsigned int prefs,
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struct in6_addr *saddr)
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{
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@@ -1579,7 +1579,6 @@ int ipv6_dev_get_saddr(struct net *net,
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in6_ifa_put(hiscore->ifa);
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return 0;
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}
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-EXPORT_SYMBOL(ipv6_dev_get_saddr);
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int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
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u32 banned_flags)
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@@ -5941,6 +5940,9 @@ int __init addrconf_init(void)
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ipv6_addr_label_rtnl_register();
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+ BUG_ON(ipv6_dev_get_saddr_hook != NULL);
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+ rcu_assign_pointer(ipv6_dev_get_saddr_hook, ___ipv6_dev_get_saddr);
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+
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return 0;
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errout:
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rtnl_af_unregister(&inet6_ops);
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@@ -5960,6 +5962,9 @@ void addrconf_cleanup(void)
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struct net_device *dev;
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int i;
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+ rcu_assign_pointer(ipv6_dev_get_saddr_hook, NULL);
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+ synchronize_rcu();
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+
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unregister_netdevice_notifier(&ipv6_dev_notf);
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unregister_pernet_subsys(&addrconf_ops);
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ipv6_addr_label_cleanup();
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--- /dev/null
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+++ b/net/ipv6/inet6_stubs.c
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@@ -0,0 +1,33 @@
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+/*
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the License, or (at your option) any later version.
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+ */
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+#include <linux/export.h>
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+#include <net/ipv6.h>
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+
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+int (*ipv6_dev_get_saddr_hook)(struct net *net, const struct net_device *dev,
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+ const struct in6_addr *daddr, unsigned int prefs,
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+ struct in6_addr *saddr);
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+
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+EXPORT_SYMBOL(ipv6_dev_get_saddr_hook);
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+
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+int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
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+ const struct in6_addr *daddr, unsigned int prefs,
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+ struct in6_addr *saddr)
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+{
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+ int ret = -EADDRNOTAVAIL;
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+ typeof(ipv6_dev_get_saddr_hook) dev_get_saddr;
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+
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+ rcu_read_lock();
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+ dev_get_saddr = rcu_dereference(ipv6_dev_get_saddr_hook);
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+
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+ if (dev_get_saddr)
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+ ret = dev_get_saddr(net, dst_dev, daddr, prefs, saddr);
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+
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+ rcu_read_unlock();
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+ return ret;
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+}
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+EXPORT_SYMBOL(ipv6_dev_get_saddr);
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+
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