[SCTP] Fix data not being delivered to user in SHUTDOWN_SENT state.

   
Also cleaned up sctp_sf_eat_data_6_2() and sctp_sf_eat_data_fast_4_4()
as they have a lot of common code.
Signed-off-by: Jorge Hernandez <jhh@lucent.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>

include/net/sctp/constants.h

@@ -175,6 +175,10 @@ typedef enum {
 	SCTP_IERROR_BAD_TAG,
 	SCTP_IERROR_BIG_GAP,
 	SCTP_IERROR_DUP_TSN,
+	SCTP_IERROR_HIGH_TSN,
+	SCTP_IERROR_IGNORE_TSN,
+	SCTP_IERROR_NO_DATA,
+	SCTP_IERROR_BAD_STREAM,
 
 } sctp_ierror_t;
 

include/net/sctp/sm.h

@@ -322,6 +322,9 @@ void sctp_send_stale_cookie_err(const struct sctp_endpoint *ep,
 				const struct sctp_chunk *chunk,
 				sctp_cmd_seq_t *commands,
 				struct sctp_chunk *err_chunk);
+int sctp_eat_data(const struct sctp_association *asoc,
+		  struct sctp_chunk *chunk,
+		  sctp_cmd_seq_t *commands);
 
 /* 3rd level prototypes */
 __u32 sctp_generate_tag(const struct sctp_endpoint *);

net/sctp/associola.c

@@ -1093,6 +1093,7 @@ static inline int sctp_peer_needs_update(struct sctp_association *asoc)
 	case SCTP_STATE_ESTABLISHED:
 	case SCTP_STATE_SHUTDOWN_PENDING:
 	case SCTP_STATE_SHUTDOWN_RECEIVED:
+	case SCTP_STATE_SHUTDOWN_SENT:
 		if ((asoc->rwnd > asoc->a_rwnd) &&
 		    ((asoc->rwnd - asoc->a_rwnd) >=
 		     min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pmtu)))