| Message ID | 20200511162442.78382-1-cpaasch@apple.com |
|---|---|
| State | New |
| Headers | show |
| Series | [net] mptcp: Initialize map_seq upon subflow establishment | expand |
On Mon, 2020-05-11 at 09:24 -0700, Christoph Paasch wrote: > When the other MPTCP-peer uses 32-bit data-sequence numbers, we rely on > map_seq to indicate how to expand to a 64-bit data-sequence number in > expand_seq() when receiving data. > > For new subflows, this field is not initialized, thus results in an > "invalid" mapping being discarded. > > Fix this by initializing map_seq upon subflow establishment time. > > Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests") > Signed-off-by: Christoph Paasch <cpaasch@apple.com> > --- > net/mptcp/protocol.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c > index e1f23016ed3f..32ea8d35489a 100644 > --- a/net/mptcp/protocol.c > +++ b/net/mptcp/protocol.c > @@ -1629,6 +1629,8 @@ bool mptcp_finish_join(struct sock *sk) > > ret = mptcp_pm_allow_new_subflow(msk); > if (ret) { > + subflow->map_seq = msk->ack_seq; > + > /* active connections are already on conn_list */ > spin_lock_bh(&msk->join_list_lock); > if (!WARN_ON_ONCE(!list_empty(&subflow->node))) Reviewed-by: Paolo Abeni <pabeni@redhat.com>
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index e1f23016ed3f..32ea8d35489a 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1629,6 +1629,8 @@ bool mptcp_finish_join(struct sock *sk) ret = mptcp_pm_allow_new_subflow(msk); if (ret) { + subflow->map_seq = msk->ack_seq; + /* active connections are already on conn_list */ spin_lock_bh(&msk->join_list_lock); if (!WARN_ON_ONCE(!list_empty(&subflow->node)))
When the other MPTCP-peer uses 32-bit data-sequence numbers, we rely on map_seq to indicate how to expand to a 64-bit data-sequence number in expand_seq() when receiving data. For new subflows, this field is not initialized, thus results in an "invalid" mapping being discarded. Fix this by initializing map_seq upon subflow establishment time. Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests") Signed-off-by: Christoph Paasch <cpaasch@apple.com> --- net/mptcp/protocol.c | 2 ++ 1 file changed, 2 insertions(+)