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mptcp: skip connecting the connected address

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This patch added a new helper named lookup_subflow_by_daddr to find
whether the destination address is in the msk's conn_list.

In mptcp_pm_nl_add_addr_received, use lookup_subflow_by_daddr to check
whether the announced address is already connected. If it is, skip
connecting this address and send out the echo.

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>
This commit is contained in:
Geliang Tang 2021-03-26 11:26:32 -07:00 committed by David S. Miller
parent f7efc7771e
commit d84ad04941
1 changed files with 23 additions and 0 deletions
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23
net/mptcp/pm_netlink.c
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@ -140,6 +140,24 @@ static bool lookup_subflow_by_saddr(const struct list_head *list,
return false;
}
static bool lookup_subflow_by_daddr(const struct list_head *list,
struct mptcp_addr_info *daddr)
{
struct mptcp_subflow_context *subflow;
struct mptcp_addr_info cur;
struct sock_common *skc;
list_for_each_entry(subflow, list, node) {
skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow);
remote_address(skc, &cur);
if (addresses_equal(&cur, daddr, daddr->port))
return true;
}
return false;
}
static struct mptcp_pm_addr_entry *
select_local_address(const struct pm_nl_pernet *pernet,
struct mptcp_sock *msk)
@ -475,6 +493,10 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
pr_debug("accepted %d:%d remote family %d",
msk->pm.add_addr_accepted, add_addr_accept_max,
msk->pm.remote.family);
if (lookup_subflow_by_daddr(&msk->conn_list, &msk->pm.remote))
goto add_addr_echo;
msk->pm.add_addr_accepted++;
msk->pm.subflows++;
if (msk->pm.add_addr_accepted >= add_addr_accept_max ||
@ -494,6 +516,7 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
__mptcp_subflow_connect(sk, &local, &remote);
spin_lock_bh(&msk->pm.lock);
add_addr_echo:
mptcp_pm_announce_addr(msk, &msk->pm.remote, true);
mptcp_pm_nl_add_addr_send_ack(msk);
}