Many bug fixes (from the IETF hack-fest):

- PR-SCTP had major issues when skipping through a multi-part message.
  o Did not look at socket buffer.
  o Did not properly handle the reassmebly queue.
  o The MARKED segments could interfere and un-skip a chunk causing
    a problem with the proper FWD-TSN.
  o No FR of FWD-TSN's was being done.
- NR-Sack code was basically disabled. It needed fixes that
  never got into the real code.
- CMT code had issues when the two paths were NOT the same b/w. We
  found a few small bugs, but also the critcal one here was not
  dividing the rwnd amongst the paths.

Obtained from:	Michael Tuexen and myself at the IETF hack-fest ;-)

1 files changed, 7 insertions, 2 deletions

diff --git a/sys/netinet/sctp_input.c b/sys/netinet/sctp_input.c
index 494929b..c962e4d 100644
--- a/sys/netinet/sctp_input.c
+++ b/sys/netinet/sctp_input.c
@@ -3150,8 +3150,10 @@ process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
 					    (uintptr_t) stcb,
 					    tp1->rec.data.TSN_seq);
 				}
-				sctp_flight_size_decrease(tp1);
-				sctp_total_flight_decrease(stcb, tp1);
+				if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+					sctp_flight_size_decrease(tp1);
+					sctp_total_flight_decrease(stcb, tp1);
+				}
 			} {
 				/* audit code */
 				unsigned int audit;
@@ -5606,11 +5608,14 @@ sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
 			/* there was a gap before this data was processed */
 			was_a_gap = 1;
 		}
+		stcb->asoc.send_sack = 1;
 		sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
 		if (abort_flag) {
 			/* Again, we aborted so NO UNLOCK needed */
 			goto out_now;
 		}
+	} else if (fwd_tsn_seen) {
+		stcb->asoc.send_sack = 1;
 	}
 	/* trigger send of any chunks in queue... */
 trigger_send: