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path: root/net/ipv6/xfrm6_policy.c
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Diffstat (limited to 'net/ipv6/xfrm6_policy.c')
-rw-r--r--net/ipv6/xfrm6_policy.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 3a3c677bc0f2..8ec3d45cd1d9 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -306,9 +306,26 @@ static void xfrm6_policy_fini(void)
xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
}
+#ifdef CONFIG_SYSCTL
+static struct ctl_table xfrm6_policy_table[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "xfrm6_gc_thresh",
+ .data = &xfrm6_dst_ops.gc_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+
+static struct ctl_table_header *sysctl_hdr;
+#endif
+
int __init xfrm6_init(void)
{
int ret;
+ unsigned int gc_thresh;
ret = xfrm6_policy_init();
if (ret)
@@ -317,6 +334,23 @@ int __init xfrm6_init(void)
ret = xfrm6_state_init();
if (ret)
goto out_policy;
+ /*
+ * We need a good default value for the xfrm6 gc threshold.
+ * In ipv4 we set it to the route hash table size * 8, which
+ * is half the size of the maximaum route cache for ipv4. It
+ * would be good to do the same thing for v6, except the table is
+ * constructed differently here. Here each table for a net namespace
+ * can have FIB_TABLE_HASHSZ entries, so lets go with the same
+ * computation that we used for ipv4 here. Also, lets keep the initial
+ * gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
+ * to that as a minimum as well
+ */
+ gc_thresh = FIB6_TABLE_HASHSZ * 8;
+ xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
+#ifdef CONFIG_SYSCTL
+ sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
+ xfrm6_policy_table);
+#endif
out:
return ret;
out_policy:
@@ -326,6 +360,10 @@ out_policy:
void xfrm6_fini(void)
{
+#ifdef CONFIG_SYSCTL
+ if (sysctl_hdr)
+ unregister_net_sysctl_table(sysctl_hdr);
+#endif
//xfrm6_input_fini();
xfrm6_policy_fini();
xfrm6_state_fini();