netns xfrm: per-netns sysctls

Make
	net.core.xfrm_aevent_etime
	net.core.xfrm_acq_expires
	net.core.xfrm_aevent_rseqth
	net.core.xfrm_larval_drop

sysctls per-netns.

For that make net_core_path[] global, register it to prevent two
/proc/net/core antries and change initcall position -- xfrm_init() is called
from fs_initcall, so this one should be fs_initcall at least.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 85 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_sysctl.c b/net/xfrm/xfrm_sysctl.c
new file mode 100644
index 000000000000..2e6ffb66f06f
--- /dev/null
+++ b/net/xfrm/xfrm_sysctl.c
@@ -0,0 +1,85 @@
+#include <linux/sysctl.h>
+#include <net/net_namespace.h>
+#include <net/xfrm.h>
+
+static void __xfrm_sysctl_init(struct net *net)
+{
+        net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME;
+        net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE;
+        net->xfrm.sysctl_larval_drop = 1;
+        net->xfrm.sysctl_acq_expires = 30;
+}
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table xfrm_table[] = {
+        {
+                .ctl_name       = NET_CORE_AEVENT_ETIME,
+                .procname       = "xfrm_aevent_etime",
+                .maxlen         = sizeof(u32),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec
+        },
+        {
+                .ctl_name       = NET_CORE_AEVENT_RSEQTH,
+                .procname       = "xfrm_aevent_rseqth",
+                .maxlen         = sizeof(u32),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "xfrm_larval_drop",
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "xfrm_acq_expires",
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec
+        },
+        {}
+};
+
+int __net_init xfrm_sysctl_init(struct net *net)
+{
+        struct ctl_table *table;
+
+        __xfrm_sysctl_init(net);
+
+        table = kmemdup(xfrm_table, sizeof(xfrm_table), GFP_KERNEL);
+        if (!table)
+                goto out_kmemdup;
+        table[0].data = &net->xfrm.sysctl_aevent_etime;
+        table[1].data = &net->xfrm.sysctl_aevent_rseqth;
+        table[2].data = &net->xfrm.sysctl_larval_drop;
+        table[3].data = &net->xfrm.sysctl_acq_expires;
+
+        net->xfrm.sysctl_hdr = register_net_sysctl_table(net, net_core_path, table);
+        if (!net->xfrm.sysctl_hdr)
+                goto out_register;
+        return 0;
+
+out_register:
+        kfree(table);
+out_kmemdup:
+        return -ENOMEM;
+}
+
+void xfrm_sysctl_fini(struct net *net)
+{
+        struct ctl_table *table;
+
+        table = net->xfrm.sysctl_hdr->ctl_table_arg;
+        unregister_net_sysctl_table(net->xfrm.sysctl_hdr);
+        kfree(table);
+}
+#else
+int __net_init xfrm_sysctl_init(struct net *net)
+{
+        __xfrm_sysctl_init(net);
+        return 0;
+}
+#endif