1 files changed, 20 insertions, 6 deletions

diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
index 7d738bd06f2c..8b235468c88f 100644
--- a/net/mptcp/ctrl.c
+++ b/net/mptcp/ctrl.c
@@ -21,43 +21,50 @@ struct mptcp_pernet {
 	struct ctl_table_header *ctl_table_hdr;
 #endif
 
-	u8 mptcp_enabled;
 	unsigned int add_addr_timeout;
+	unsigned int stale_loss_cnt;
+	u8 mptcp_enabled;
 	u8 checksum_enabled;
 	u8 allow_join_initial_addr_port;
 };
 
-static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
+static struct mptcp_pernet *mptcp_get_pernet(const struct net *net)
 {
 	return net_generic(net, mptcp_pernet_id);
 }
 
-int mptcp_is_enabled(struct net *net)
+int mptcp_is_enabled(const struct net *net)
 {
 	return mptcp_get_pernet(net)->mptcp_enabled;
 }
 
-unsigned int mptcp_get_add_addr_timeout(struct net *net)
+unsigned int mptcp_get_add_addr_timeout(const struct net *net)
 {
 	return mptcp_get_pernet(net)->add_addr_timeout;
 }
 
-int mptcp_is_checksum_enabled(struct net *net)
+int mptcp_is_checksum_enabled(const struct net *net)
 {
 	return mptcp_get_pernet(net)->checksum_enabled;
 }
 
-int mptcp_allow_join_id0(struct net *net)
+int mptcp_allow_join_id0(const struct net *net)
 {
 	return mptcp_get_pernet(net)->allow_join_initial_addr_port;
 }
 
+unsigned int mptcp_stale_loss_cnt(const struct net *net)
+{
+	return mptcp_get_pernet(net)->stale_loss_cnt;
+}
+
 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;
 	pernet->allow_join_initial_addr_port = 1;
+	pernet->stale_loss_cnt = 4;
 }
 
 #ifdef CONFIG_SYSCTL
@@ -95,6 +102,12 @@ static struct ctl_table mptcp_sysctl_table[] = {
 		.extra1       = SYSCTL_ZERO,
 		.extra2       = SYSCTL_ONE
 	},
+	{
+		.procname = "stale_loss_cnt",
+		.maxlen = sizeof(unsigned int),
+		.mode = 0644,
+		.proc_handler = proc_douintvec_minmax,
+	},
 	{}
 };
 
@@ -114,6 +127,7 @@ static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
 	table[1].data = &pernet->add_addr_timeout;
 	table[2].data = &pernet->checksum_enabled;
 	table[3].data = &pernet->allow_join_initial_addr_port;
+	table[4].data = &pernet->stale_loss_cnt;
 
 	hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
 	if (!hdr)