sctp: handle ootb packet in chunk order as defined

Changed the order of processing SHUTDOWN ACK and COOKIE ACK
refer to section 8.4:Handle "Out of the Blue" Packets.

SHUTDOWN ACK chunk should be processed before processing
"Stale Cookie" ERROR or a COOKIE ACK.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 194d5ec..ad3b43b 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -3332,8 +3332,10 @@
 	struct sctp_chunk *chunk = arg;
 	struct sk_buff *skb = chunk->skb;
 	sctp_chunkhdr_t *ch;
+	sctp_errhdr_t *err;
 	__u8 *ch_end;
 	int ootb_shut_ack = 0;
+	int ootb_cookie_ack = 0;
 
 	SCTP_INC_STATS(SCTP_MIB_OUTOFBLUES);
 
@@ -3358,6 +3360,23 @@
 		if (SCTP_CID_ABORT == ch->type)
 			return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 
+		/* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR
+		 * or a COOKIE ACK the SCTP Packet should be silently
+		 * discarded.
+		 */
+
+		if (SCTP_CID_COOKIE_ACK == ch->type)
+			ootb_cookie_ack = 1;
+
+		if (SCTP_CID_ERROR == ch->type) {
+			sctp_walk_errors(err, ch) {
+				if (SCTP_ERROR_STALE_COOKIE == err->cause) {
+					ootb_cookie_ack = 1;
+					break;
+				}
+			}
+		}
+
 		/* Report violation if chunk len overflows */
 		ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
 		if (ch_end > skb_tail_pointer(skb))
@@ -3369,6 +3388,8 @@
 
 	if (ootb_shut_ack)
 		return sctp_sf_shut_8_4_5(ep, asoc, type, arg, commands);
+	else if (ootb_cookie_ack)
+		return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 	else
 		return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
 }