commit bc19ff57637ff563d2bdf2b385b48c41e6509e0d upstream.
The lookup_subflow_by_daddr() helper checks if there is already a subflow connected to this address. But there could be a subflow that is closing, but taking time due to some reasons: latency, losses, data to process, etc.
If an ADD_ADDR is received while the endpoint is being closed, it is better to try connecting to it, instead of rejecting it: the peer which has sent the ADD_ADDR will not be notified that the ADD_ADDR has been rejected for this reason, and the expected subflow will not be created at the end.
This helper should then only look for subflows that are established, or going to be, but not the ones being closed.
Fixes: d84ad04941c3 ("mptcp: skip connecting the connected address") Cc: stable@vger.kernel.org Reviewed-by: Mat Martineau martineau@kernel.org Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org Signed-off-by: Paolo Abeni pabeni@redhat.com [ Conflicts in pm_netlink.c, due to commit 4638de5aefe5 ("mptcp: handle local addrs announced by userspace PMs"), not in this version, and changing the context. The same fix can still be applied. ] Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org --- net/mptcp/pm_netlink.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 6434569e1c7f..5622dd05087c 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -145,12 +145,15 @@ static bool lookup_subflow_by_daddr(const struct list_head *list, { 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); + struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
- remote_address(skc, &cur); + if (!((1 << inet_sk_state_load(ssk)) & + (TCPF_ESTABLISHED | TCPF_SYN_SENT | TCPF_SYN_RECV))) + continue; + + remote_address((struct sock_common *)ssk, &cur); if (addresses_equal(&cur, daddr, daddr->port)) return true; }