1 files changed, 57 insertions, 0 deletions
diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
new file mode 100644
index 000000000..c09bea891
--- /dev/null
+++ b/net/unix/sysctl_net_unix.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NET4:	Sysctl interface to net af_unix subsystem.
+ *
+ * Authors:	Mike Shaver.
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+
+#include <net/af_unix.h>
+
+static struct ctl_table unix_table[] = {
+	{
+		.procname	= "max_dgram_qlen",
+		.data		= &init_net.unx.sysctl_max_dgram_qlen,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec
+	},
+	{ }
+};
+
+int __net_init unix_sysctl_register(struct net *net)
+{
+	struct ctl_table *table;
+
+	table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
+	if (table == NULL)
+		goto err_alloc;
+
+	/* Don't export sysctls to unprivileged users */
+	if (net->user_ns != &init_user_ns)
+		table[0].procname = NULL;
+
+	table[0].data = &net->unx.sysctl_max_dgram_qlen;
+	net->unx.ctl = register_net_sysctl(net, "net/unix", table);
+	if (net->unx.ctl == NULL)
+		goto err_reg;
+
+	return 0;
+
+err_reg:
+	kfree(table);
+err_alloc:
+	return -ENOMEM;
+}
+
+void unix_sysctl_unregister(struct net *net)
+{
+	struct ctl_table *table;
+
+	table = net->unx.ctl->ctl_table_arg;
+	unregister_net_sysctl_table(net->unx.ctl);
+	kfree(table);
+}