net: Allow fib_rule_unregister to batch
Refactor the code so fib_rules_register always takes a template instead
of the actual fib_rules_ops structure that will be used. This is
required for network namespace support so 2 out of the 3 callers already
do this, it allows the error handling to be made common, and it allows
fib_rules_unregister to free the template for hte caller.
Modify fib_rules_unregister to use call_rcu instead of syncrhonize_rcu
to allw multiple namespaces to be cleaned up in the same rcu grace
period.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 3b38f49..b7aa7c6 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -264,16 +264,14 @@
static int fib6_rules_net_init(struct net *net)
{
+ struct fib_rules_ops *ops;
int err = -ENOMEM;
- net->ipv6.fib6_rules_ops = kmemdup(&fib6_rules_ops_template,
- sizeof(*net->ipv6.fib6_rules_ops),
- GFP_KERNEL);
- if (!net->ipv6.fib6_rules_ops)
- goto out;
+ ops = fib_rules_register(&fib6_rules_ops_template, net);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+ net->ipv6.fib6_rules_ops = ops;
- net->ipv6.fib6_rules_ops->fro_net = net;
- INIT_LIST_HEAD(&net->ipv6.fib6_rules_ops->rules_list);
err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
RT6_TABLE_LOCAL, 0);
@@ -283,25 +281,19 @@
err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
0x7FFE, RT6_TABLE_MAIN, 0);
if (err)
- goto out_fib6_default_rule_add;
+ goto out_fib6_rules_ops;
- err = fib_rules_register(net->ipv6.fib6_rules_ops);
- if (err)
- goto out_fib6_default_rule_add;
out:
return err;
-out_fib6_default_rule_add:
- fib_rules_cleanup_ops(net->ipv6.fib6_rules_ops);
out_fib6_rules_ops:
- kfree(net->ipv6.fib6_rules_ops);
+ fib_rules_unregister(ops);
goto out;
}
static void fib6_rules_net_exit(struct net *net)
{
fib_rules_unregister(net->ipv6.fib6_rules_ops);
- kfree(net->ipv6.fib6_rules_ops);
}
static struct pernet_operations fib6_rules_net_ops = {