mptcp: send ack for every add_addr

This patch changes the sending ACK conditions for the ADD_ADDR, send an
ACK packet for any ADD_ADDR, not just when ipv6 addresses or port
numbers are included.

Closes: #139
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>

net/mptcp/pm.c

@@ -191,8 +191,7 @@ void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
 
 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk)
 {
- if (!mptcp_pm_should_add_signal_ipv6(msk) &&
- !mptcp_pm_should_add_signal_port(msk))
+ if (!mptcp_pm_should_add_signal(msk))
  return;
 
  mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_SEND_ACK);

net/mptcp/pm_netlink.c

@@ -474,8 +474,7 @@ void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk)
 {
  struct mptcp_subflow_context *subflow;
 
- if (!mptcp_pm_should_add_signal_ipv6(msk) &&
- !mptcp_pm_should_add_signal_port(msk))
+ if (!mptcp_pm_should_add_signal(msk))
  return;
 
  __mptcp_flush_join_list(msk);
@@ -485,10 +484,9 @@ void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk)
  u8 add_addr;
 
  spin_unlock_bh(&msk->pm.lock);
- if (mptcp_pm_should_add_signal_ipv6(msk))
- pr_debug("send ack for add_addr6");
- if (mptcp_pm_should_add_signal_port(msk))
- pr_debug("send ack for add_addr_port");
+ pr_debug("send ack for add_addr%s%s",
+ mptcp_pm_should_add_signal_ipv6(msk) ? " [ipv6]" : "",
+ mptcp_pm_should_add_signal_port(msk) ? " [port]" : "");
 
  lock_sock(ssk);
  tcp_send_ack(ssk);