sctp: Bundle HEAERTBEAT into ASCONF_ACK

With this patch a HEARTBEAT chunk is bundled into the ASCONF-ACK
for ADD IP ADDRESS, confirming the new destination as quickly as
possible.

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

3 files changed, 7 insertions, 0 deletions

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index dc16b90ddb6f..152b5b3c3fff 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -282,6 +282,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
                 asoc->peer.asconf_capable = 1;
         asoc->asconf_addr_del_pending = NULL;
         asoc->src_out_of_asoc_ok = 0;
+        asoc->new_transport = NULL;
 
         /* Create an input queue.  */
         sctp_inq_init(&asoc->base.inqueue);
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 81db4e385352..0121e0ab0351 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3015,6 +3015,7 @@ static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
                 /* Start the heartbeat timer. */
                 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
                         sctp_transport_hold(peer);
+                asoc->new_transport = peer;
                 break;
         case SCTP_PARAM_DEL_IP:
                 /* ADDIP 4.3 D7) If a request is received to delete the
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 49b847b00f99..73d14fc02606 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -3612,6 +3612,11 @@ sctp_disposition_t sctp_sf_do_asconf(const struct sctp_endpoint *ep,
          */
         asconf_ack->dest = chunk->source;
         sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack));
+        if (asoc->new_transport) {
+                sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport,
+                    commands);
+                ((struct sctp_association *)asoc)->new_transport = NULL;
+        }
 
         return SCTP_DISPOSITION_CONSUME;
 }