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xfrm: make gc_thresh configurable in all namespaces

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The xfrm gc threshold can be configured via xfrm{4,6}_gc_thresh
sysctl but currently only in init_net, other namespaces always
use the default value. This can substantially limit the number
of IPsec tunnels that can be effectively used.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Michal Kubecek
2013-02-06 10:46:33 +01:00
committed by Steffen Klassert
parent 1f53c80850
commit 8d068875ca
4 changed files with 95 additions and 8 deletions
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49
net/ipv4/xfrm4_policy.c
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@@ -262,7 +262,51 @@ static struct ctl_table xfrm4_policy_table[] = {
{ }
};
static struct ctl_table_header *sysctl_hdr;
static int __net_init xfrm4_net_init(struct net *net)
{
struct ctl_table *table;
struct ctl_table_header *hdr;
table = xfrm4_policy_table;
if (!net_eq(net, &init_net)) {
table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
if (!table)
goto err_alloc;
table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
}
hdr = register_net_sysctl(net, "net/ipv4", table);
if (!hdr)
goto err_reg;
net->ipv4.xfrm4_hdr = hdr;
return 0;
err_reg:
if (!net_eq(net, &init_net))
kfree(table);
err_alloc:
return -ENOMEM;
}
static void __net_exit xfrm4_net_exit(struct net *net)
{
struct ctl_table *table;
if (net->ipv4.xfrm4_hdr == NULL)
return;
table = net->ipv4.xfrm4_hdr->ctl_table_arg;
unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
if (!net_eq(net, &init_net))
kfree(table);
}
static struct pernet_operations __net_initdata xfrm4_net_ops = {
.init = xfrm4_net_init,
.exit = xfrm4_net_exit,
};
#endif
static void __init xfrm4_policy_init(void)
@@ -277,8 +321,7 @@ void __init xfrm4_init(void)
xfrm4_state_init();
xfrm4_policy_init();
#ifdef CONFIG_SYSCTL
sysctl_hdr = register_net_sysctl(&init_net, "net/ipv4",
xfrm4_policy_table);
register_pernet_subsys(&xfrm4_net_ops);
#endif
}