net: sctp: sctp_assoc_control_transport: fix MTU size in SCTP_PF state

The SCTP Quick failover draft [1] section 5.1, point 5 says that the cwnd
should be 1 MTU. So, instead of 1, set it to 1 MTU.

  [1] https://tools.ietf.org/html/draft-nishida-tsvwg-sctp-failover-05

Reported-by: Karl Heiss <kheiss@gmail.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index bce5b79662a6..ab67efc64b24 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -846,12 +846,12 @@ void sctp_assoc_control_transport(struct sctp_association *asoc,
                 else
                         spc_state = SCTP_ADDR_AVAILABLE;
                 /* Don't inform ULP about transition from PF to
-                 * active state and set cwnd to 1, see SCTP
+                 * active state and set cwnd to 1 MTU, see SCTP
                  * Quick failover draft section 5.1, point 5
                  */
                 if (transport->state == SCTP_PF) {
                         ulp_notify = false;
-                        transport->cwnd = 1;
+                        transport->cwnd = asoc->pathmtu;
                 }
                 transport->state = SCTP_ACTIVE;
                 break;