[MPTCP] [MPTCP][PATCH v2 mptcp-next 1/2] mptcp: add a new sysctl add_addr_timeout

[MPTCP] [MPTCP][PATCH v2 mptcp-next 1/2] mptcp: add a new sysctl add_addr_timeout

[Geliang Tang]

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This patch added a new sysctl, named add_addr_timeout, to control the
timeout value (in seconds) of the ADD_ADDR retransmission.

Signed-off-by: Geliang Tang <geliangtang(a)gmail.com>
---
 net/mptcp/ctrl.c       | 14 ++++++++++++++
 net/mptcp/pm_netlink.c |  8 ++++++--
 net/mptcp/protocol.h   |  1 +
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
index 54b888f94009..db185b198b53 100644
--- a/net/mptcp/ctrl.c
+++ b/net/mptcp/ctrl.c
@@ -18,6 +18,7 @@ struct mptcp_pernet {
 	struct ctl_table_header *ctl_table_hdr;
 
 	int mptcp_enabled;
+	u32 add_addr_timeout;
 };
 
 static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
@@ -30,6 +31,11 @@ int mptcp_is_enabled(struct net *net)
 	return mptcp_get_pernet(net)->mptcp_enabled;
 }
 
+unsigned long mptcp_get_add_addr_timeout(struct net *net)
+{
+	return jiffies + mptcp_get_pernet(net)->add_addr_timeout * HZ;
+}
+
 static struct ctl_table mptcp_sysctl_table[] = {
 	{
 		.procname = "enabled",
@@ -40,12 +46,19 @@ static struct ctl_table mptcp_sysctl_table[] = {
 		 */
 		.proc_handler = proc_dointvec,
 	},
+	{
+		.procname = "add_addr_timeout",
+		.maxlen = sizeof(u32),
+		.mode = 0644,
+		.proc_handler = proc_douintvec,
+	},
 	{}
 };
 
 static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
 {
 	pernet->mptcp_enabled = 1;
+	pernet->add_addr_timeout = TCP_RTO_MAX / HZ;
 }
 
 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
@@ -61,6 +74,7 @@ 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;
 
 	hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
 	if (!hdr)
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 5a0e4d11bcc3..d5fef101b67f 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -206,6 +206,8 @@ static void mptcp_pm_add_timer(struct timer_list *timer)
 	struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer);
 	struct mptcp_sock *msk = entry->sock;
 	struct sock *sk = (struct sock *)msk;
+	struct net *net = sock_net(sk);
+	unsigned long timeout = mptcp_get_add_addr_timeout(net);
 
 	pr_debug("msk=%p", msk);
 
@@ -232,7 +234,7 @@ static void mptcp_pm_add_timer(struct timer_list *timer)
 	}
 
 	if (entry->retrans_times < ADD_ADDR_RETRANS_MAX)
-		sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX);
+		sk_reset_timer(sk, timer, timeout);
 
 	spin_unlock_bh(&msk->pm.lock);
 
@@ -264,6 +266,8 @@ static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
 {
 	struct mptcp_pm_add_entry *add_entry = NULL;
 	struct sock *sk = (struct sock *)msk;
+	struct net *net = sock_net(sk);
+	unsigned long timeout = mptcp_get_add_addr_timeout(net);
 
 	if (lookup_anno_list_by_saddr(msk, &entry->addr))
 		return false;
@@ -279,7 +283,7 @@ static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
 	add_entry->retrans_times = 0;
 
 	timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0);
-	sk_reset_timer(sk, &add_entry->add_timer, jiffies + TCP_RTO_MAX);
+	sk_reset_timer(sk, &add_entry->add_timer, timeout);
 
 	return true;
 }
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 7cfe52aeb2b8..b1ea78474b84 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -361,6 +361,7 @@ mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
 }
 
 int mptcp_is_enabled(struct net *net);
+unsigned long mptcp_get_add_addr_timeout(struct net *net);
 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
 				     struct mptcp_options_received *mp_opt);
 bool mptcp_subflow_data_available(struct sock *sk);
-- 
2.17.1