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Date: Sun, 21 Sep 2014 00:05:22 +0200
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: netdev@...r.kernel.org
Cc: eric.dumazet@...il.com, vyasevich@...il.com,
nicolas.dichtel@...nd.com, kafai@...com
Subject: [PATCH net-next 5/8] ipv6: new function fib6_flush_trees and use it instead of bumping removed rt6_genid
fib6_flush_trees is still a very costly operation but now is only called
by xfrm code when a policy changes or ipv6 addresses are added/removed.
fib6_flush_tree must walk all ipv6 routing tables and modify fn_sernum,
so all sockets relookup their dst_entries. Use a NULL callback, so we
only walk the nodes without looking at the rt6_infos.
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: Martin Lau <kafai@...com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
include/net/net_namespace.h | 14 +++-----------
include/net/netns/ipv6.h | 1 -
net/ipv6/addrconf_core.c | 6 ++++++
net/ipv6/af_inet6.c | 1 -
net/ipv6/ip6_fib.c | 21 +++++++++++++++++----
net/ipv6/route.c | 4 ----
6 files changed, 26 insertions(+), 21 deletions(-)
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 361d260..61aad36 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -353,21 +353,13 @@ static inline void rt_genid_bump_ipv4(struct net *net)
}
#if IS_ENABLED(CONFIG_IPV6)
-static inline int rt_genid_ipv6(struct net *net)
-{
- return atomic_read(&net->ipv6.rt_genid);
-}
-
+extern void (*__fib6_flush_trees)(struct net *);
static inline void rt_genid_bump_ipv6(struct net *net)
{
- atomic_inc(&net->ipv6.rt_genid);
+ if (__fib6_flush_trees)
+ __fib6_flush_trees(net);
}
#else
-static inline int rt_genid_ipv6(struct net *net)
-{
- return 0;
-}
-
static inline void rt_genid_bump_ipv6(struct net *net)
{
}
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index eade27a..3291ba6 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -76,7 +76,6 @@ struct netns_ipv6 {
#endif
#endif
atomic_t dev_addr_genid;
- atomic_t rt_genid;
};
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index e696045..8b2d99a 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -10,6 +10,12 @@
#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
+/* if ipv6 module registers this function is used by xfrm to force
+ * all sockets to relookup their nodes - this is fairly expensive
+ */
+void (*__fib6_flush_trees)(struct net *);
+EXPORT_SYMBOL(__fib6_flush_trees);
+
static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
{
switch (scope) {
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index e4865a3..2189d2d 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -766,7 +766,6 @@ static int __net_init inet6_net_init(struct net *net)
net->ipv6.sysctl.icmpv6_time = 1*HZ;
net->ipv6.sysctl.flowlabel_consistency = 1;
net->ipv6.sysctl.auto_flowlabels = 0;
- atomic_set(&net->ipv6.rt_genid, 0);
err = ipv6_init_mibs(net);
if (err)
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 8db8b1c..0fe9241 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1574,8 +1574,9 @@ static void fib6_clean_tree(struct net *net, struct fib6_node *root,
fib6_walk(&c.w);
}
-void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
- void *arg)
+void __fib6_clean_all(struct net *net,
+ int (*func)(struct rt6_info *, void *arg),
+ u32 sernum, void *arg)
{
struct fib6_table *table;
struct hlist_head *head;
@@ -1587,14 +1588,24 @@ void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
hlist_for_each_entry_rcu(table, head, tb6_hlist) {
write_lock_bh(&table->tb6_lock);
fib6_clean_tree(net, &table->tb6_root,
- func, false, FIB6_NO_SERNUM_CHANGE,
- arg);
+ func, false, sernum, arg);
write_unlock_bh(&table->tb6_lock);
}
}
rcu_read_unlock();
}
+void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
+ void *arg)
+{
+ __fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg);
+}
+
+static void fib6_flush_trees(struct net *net)
+{
+ __fib6_clean_all(net, NULL, fib6_new_sernum(), NULL);
+}
+
static int fib6_prune_clone(struct rt6_info *rt, void *arg)
{
if (rt->rt6i_flags & RTF_CACHE) {
@@ -1793,6 +1804,8 @@ int __init fib6_init(void)
NULL);
if (ret)
goto out_unregister_subsys;
+
+ __fib6_flush_trees = fib6_flush_trees;
out:
return ret;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f74b041..a318dd89 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -314,7 +314,6 @@ static inline struct rt6_info *ip6_dst_alloc(struct net *net,
memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
- rt->rt6i_genid = rt_genid_ipv6(net);
INIT_LIST_HEAD(&rt->rt6i_siblings);
}
return rt;
@@ -1096,9 +1095,6 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
* DST_OBSOLETE_FORCE_CHK which forces validation calls down
* into this function always.
*/
- if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
- return NULL;
-
if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
return NULL;
--
1.9.3
--
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