sctp: release cached route when the transport goes down.

When the sctp transport is marked down, we can release the
cached route and force a new lookup when attempting to use
this transport for anything.  This way, if a better route
or source address is available, we'll try to use it.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 525864bf4f07..215b56951d76 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -810,11 +810,16 @@ void sctp_assoc_control_transport(struct sctp_association *asoc,
                 break;
 
         case SCTP_TRANSPORT_DOWN:
-                /* if the transort was never confirmed, do not transition it
-                 * to inactive state.
+                /* If the transport was never confirmed, do not transition it
+                 * to inactive state.  Also, release the cached route since
+                 * there may be a better route next time.
                  */
                 if (transport->state != SCTP_UNCONFIRMED)
                         transport->state = SCTP_INACTIVE;
+                else {
+                        dst_release(transport->dst);
+                        transport->dst = NULL;
+                }
 
                 spc_state = SCTP_ADDR_UNREACHABLE;
                 break;