1 files changed, 43 insertions, 9 deletions

diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
index 96ba616f59bf..6c2639bb9c19 100644
--- a/net/mptcp/ctrl.c
+++ b/net/mptcp/ctrl.c
@@ -4,7 +4,9 @@
  * Copyright (c) 2019, Tessares SA.
  */
 
+#ifdef CONFIG_SYSCTL
 #include <linux/sysctl.h>
+#endif
 
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
@@ -15,10 +17,13 @@
 
 static int mptcp_pernet_id;
 struct mptcp_pernet {
+#ifdef CONFIG_SYSCTL
 	struct ctl_table_header *ctl_table_hdr;
+#endif
 
-	int mptcp_enabled;
+	u8 mptcp_enabled;
 	unsigned int add_addr_timeout;
+	u8 checksum_enabled;
 };
 
 static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
@@ -36,15 +41,30 @@ unsigned int mptcp_get_add_addr_timeout(struct net *net)
 	return mptcp_get_pernet(net)->add_addr_timeout;
 }
 
+int mptcp_is_checksum_enabled(struct net *net)
+{
+	return mptcp_get_pernet(net)->checksum_enabled;
+}
+
+static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
+{
+	pernet->mptcp_enabled = 1;
+	pernet->add_addr_timeout = TCP_RTO_MAX;
+	pernet->checksum_enabled = 0;
+}
+
+#ifdef CONFIG_SYSCTL
 static struct ctl_table mptcp_sysctl_table[] = {
 	{
 		.procname = "enabled",
-		.maxlen = sizeof(int),
+		.maxlen = sizeof(u8),
 		.mode = 0644,
 		/* users with CAP_NET_ADMIN or root (not and) can change this
 		 * value, same as other sysctl or the 'net' tree.
 		 */
-		.proc_handler = proc_dointvec,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1       = SYSCTL_ZERO,
+		.extra2       = SYSCTL_ONE
 	},
 	{
 		.procname = "add_addr_timeout",
@@ -52,15 +72,17 @@ static struct ctl_table mptcp_sysctl_table[] = {
 		.mode = 0644,
 		.proc_handler = proc_dointvec_jiffies,
 	},
+	{
+		.procname = "checksum_enabled",
+		.maxlen = sizeof(u8),
+		.mode = 0644,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1       = SYSCTL_ZERO,
+		.extra2       = SYSCTL_ONE
+	},
 	{}
 };
 
-static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
-{
-	pernet->mptcp_enabled = 1;
-	pernet->add_addr_timeout = TCP_RTO_MAX;
-}
-
 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
 {
 	struct ctl_table_header *hdr;
@@ -75,6 +97,7 @@ static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
 
 	table[0].data = &pernet->mptcp_enabled;
 	table[1].data = &pernet->add_addr_timeout;
+	table[2].data = &pernet->checksum_enabled;
 
 	hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
 	if (!hdr)
@@ -100,6 +123,17 @@ static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
 	kfree(table);
 }
 
+#else
+
+static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
+{
+	return 0;
+}
+
+static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {}
+
+#endif /* CONFIG_SYSCTL */
+
 static int __net_init mptcp_net_init(struct net *net)
 {
 	struct mptcp_pernet *pernet = mptcp_get_pernet(net);