[SCTP]: extend exported data in /proc/net/sctp/assoc

RFC 3873 specifies several MIB objects that can't be obtained by the
current data set exported by /proc/sys/net/sctp/assoc.  This patch
adds the missing pieces of data that allow us to compute all the
objects in the sctpAssocTable object.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 1bb3c5c..fd4deef 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -494,6 +494,8 @@
 		 */
 		if (transport == transport->asoc->peer.retran_path)
 			sctp_assoc_update_retran_path(transport->asoc);
+		transport->asoc->rtx_data_chunks +=
+			transport->asoc->unack_data;
 		break;
 	case SCTP_RTXR_FAST_RTX:
 		SCTP_INC_STATS(SCTP_MIB_FAST_RETRANSMITS);
@@ -504,6 +506,7 @@
 		break;
 	case SCTP_RTXR_T1_RTX:
 		SCTP_INC_STATS(SCTP_MIB_T1_RETRANSMITS);
+		transport->asoc->init_retries++;
 		break;
 	default:
 		BUG();