sctp: introduce sctp_dst_mtu

Which makes sure that the MTU respects the minimum value of
SCTP_DEFAULT_MINSEGMENT and that it is correctly aligned.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index c5fc3aed08a1..ed73a9d91b83 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -242,9 +242,9 @@ void sctp_transport_pmtu(struct sctp_transport *transport, struct sock *sk)
                                                 &transport->fl, sk);
         }
 
-        if (transport->dst) {
-                transport->pathmtu = SCTP_TRUNC4(dst_mtu(transport->dst));
-        } else
+        if (transport->dst)
+                transport->pathmtu = sctp_dst_mtu(transport->dst);
+        else
                 transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
 }