sctp: Enforce retransmission limit during shutdown

[pandora-kernel.git] / net / sctp / outqueue.c

diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 1c88c89..d036821 100644 (file)
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -1582,6 +1582,8 @@ static void sctp_check_transmitted(struct sctp_outq *q,
 #endif /* SCTP_DEBUG */
        if (transport) {
                if (bytes_acked) {
+                       struct sctp_association *asoc = transport->asoc;
+
                        /* We may have counted DATA that was migrated
                         * to this transport due to DEL-IP operation.
                         * Subtract those bytes, since the were never
@@ -1600,6 +1602,17 @@ static void sctp_check_transmitted(struct sctp_outq *q,
                        transport->error_count = 0;
                        transport->asoc->overall_error_count = 0;
 
+                       /*
+                        * While in SHUTDOWN PENDING, we may have started
+                        * the T5 shutdown guard timer after reaching the
+                        * retransmission limit. Stop that timer as soon
+                        * as the receiver acknowledged any data.
+                        */
+                       if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING &&
+                           del_timer(&asoc->timers
+                               [SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]))
+                                       sctp_association_put(asoc);
+
                        /* Mark the destination transport address as
                         * active if it is not so marked.
                         */
@@ -1629,10 +1642,15 @@ static void sctp_check_transmitted(struct sctp_outq *q,
                         * A sender is doing zero window probing when the
                         * receiver's advertised window is zero, and there is
                         * only one data chunk in flight to the receiver.
+                        *
+                        * Allow the association to timeout while in SHUTDOWN
+                        * PENDING or SHUTDOWN RECEIVED in case the receiver
+                        * stays in zero window mode forever.
                         */
                        if (!q->asoc->peer.rwnd &&
                            !list_empty(&tlist) &&
-                           (sack_ctsn+2 == q->asoc->next_tsn)) {
+                           (sack_ctsn+2 == q->asoc->next_tsn) &&
+                           q->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) {
                                SCTP_DEBUG_PRINTK("%s: SACK received for zero "
                                                  "window probe: %u\n",
                                                  __func__, sack_ctsn);