mptcp: add rm_list_rx in mptcp_pm_data

This patch added a new member rm_list_rx for struct mptcp_pm_data as an
list of the removing address ids on the incoming direction. Initialized
its nr field to zero in mptcp_pm_data_init.

In mptcp_pm_rm_addr_received, set it as the input rm_list.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mptcp/pm.c

@@ -218,7 +218,7 @@ void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
 
 	spin_lock_bh(&pm->lock);
 	mptcp_pm_schedule_work(msk, MPTCP_PM_RM_ADDR_RECEIVED);
-	pm->rm_id = rm_list->ids[0];
+	pm->rm_list_rx = *rm_list;
 	spin_unlock_bh(&pm->lock);
 }
 
@@ -300,6 +300,7 @@ void mptcp_pm_data_init(struct mptcp_sock *msk)
 	msk->pm.local_addr_used = 0;
 	msk->pm.subflows = 0;
 	msk->pm.rm_list_tx.nr = 0;
+	msk->pm.rm_list_rx.nr = 0;
 	WRITE_ONCE(msk->pm.work_pending, false);
 	WRITE_ONCE(msk->pm.addr_signal, 0);
 	WRITE_ONCE(msk->pm.accept_addr, false);

net/mptcp/protocol.h

@@ -208,6 +208,7 @@ struct mptcp_pm_data {
 	u8		subflows;
 	u8		status;
 	struct mptcp_rm_list rm_list_tx;
+	struct mptcp_rm_list rm_list_rx;
 	u8		rm_id;
 };