sctp: fasthandoff with ASCONF at server-node

Retransmit chunks to newly confirmed destination when ASCONF and
HEARTBEAT negotiation has success with a single-homed peer.

Signed-off-by: Michio Honda <micchie@sfc.wide.ad.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 76388b083f28..1ff51c9d18d5 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -666,6 +666,7 @@ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
                                   struct sctp_chunk *chunk)
 {
         sctp_sender_hb_info_t *hbinfo;
+        int was_unconfirmed = 0;
 
         /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
          * HEARTBEAT should clear the error counter of the destination
@@ -692,9 +693,11 @@ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
         /* Mark the destination transport address as active if it is not so
          * marked.
          */
-        if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED))
+        if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) {
+                was_unconfirmed = 1;
                 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
                                              SCTP_HEARTBEAT_SUCCESS);
+        }
 
         /* The receiver of the HEARTBEAT ACK should also perform an
          * RTT measurement for that destination transport address
@@ -712,6 +715,9 @@ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
         /* Update the heartbeat timer.  */
         if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
                 sctp_transport_hold(t);
+
+        if (was_unconfirmed && asoc->peer.transport_count == 1)
+                sctp_transport_immediate_rtx(t);
 }