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Diffstat (limited to 'net/ipv4/xfrm4_policy.c')
-rw-r--r--net/ipv4/xfrm4_policy.c37
1 files changed, 36 insertions, 1 deletions
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 0071ee6f441f..74fb2eb833ec 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -264,6 +264,22 @@ static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
.fill_dst = xfrm4_fill_dst,
};
+#ifdef CONFIG_SYSCTL
+static struct ctl_table xfrm4_policy_table[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "xfrm4_gc_thresh",
+ .data = &xfrm4_dst_ops.gc_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+
+static struct ctl_table_header *sysctl_hdr;
+#endif
+
static void __init xfrm4_policy_init(void)
{
xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
@@ -271,12 +287,31 @@ static void __init xfrm4_policy_init(void)
static void __exit xfrm4_policy_fini(void)
{
+#ifdef CONFIG_SYSCTL
+ if (sysctl_hdr)
+ unregister_net_sysctl_table(sysctl_hdr);
+#endif
xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
}
-void __init xfrm4_init(void)
+void __init xfrm4_init(int rt_max_size)
{
xfrm4_state_init();
xfrm4_policy_init();
+ /*
+ * Select a default value for the gc_thresh based on the main route
+ * table hash size. It seems to me the worst case scenario is when
+ * we have ipsec operating in transport mode, in which we create a
+ * dst_entry per socket. The xfrm gc algorithm starts trying to remove
+ * entries at gc_thresh, and prevents new allocations as 2*gc_thresh
+ * so lets set an initial xfrm gc_thresh value at the rt_max_size/2.
+ * That will let us store an ipsec connection per route table entry,
+ * and start cleaning when were 1/2 full
+ */
+ xfrm4_dst_ops.gc_thresh = rt_max_size/2;
+#ifdef CONFIG_SYSCTL
+ sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv4_ctl_path,
+ xfrm4_policy_table);
+#endif
}