SCTP: Use net_ratelimit to suppress error messages print too fast

When multi bundling SHUTDOWN-ACK message is received in ESTAB state,
this will cause "sctp protocol violation state" message print many times.
If SHUTDOWN-ACK is bundled 300 times in one packet, message will be
print 300 times. The same problem also exists when received unexpected
HEARTBEAT-ACK message which is bundled message times.

This patch used net_ratelimit() to suppress error messages print too fast.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

net/sctp/sm_sideeffect.c

@@ -1013,8 +1013,9 @@ static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
 		break;
 
 	case SCTP_DISPOSITION_VIOLATION:
-		printk(KERN_ERR "sctp protocol violation state %d "
-		       "chunkid %d\n", state, subtype.chunk);
+		if (net_ratelimit())
+			printk(KERN_ERR "sctp protocol violation state %d "
+			       "chunkid %d\n", state, subtype.chunk);
 		break;
 
 	case SCTP_DISPOSITION_NOT_IMPL:

net/sctp/sm_statefuns.c

@@ -1032,19 +1032,21 @@ sctp_disposition_t sctp_sf_backbeat_8_3(const struct sctp_endpoint *ep,
 	/* This should never happen, but lets log it if so.  */
 	if (unlikely(!link)) {
 		if (from_addr.sa.sa_family == AF_INET6) {
-			printk(KERN_WARNING
-			       "%s association %p could not find address "
-			       NIP6_FMT "\n",
-			       __FUNCTION__,
-			       asoc,
-			       NIP6(from_addr.v6.sin6_addr));
+			if (net_ratelimit())
+				printk(KERN_WARNING
+				    "%s association %p could not find address "
+				    NIP6_FMT "\n",
+				    __FUNCTION__,
+				    asoc,
+				    NIP6(from_addr.v6.sin6_addr));
 		} else {
-			printk(KERN_WARNING
-			       "%s association %p could not find address "
-			       NIPQUAD_FMT "\n",
-			       __FUNCTION__,
-			       asoc,
-			       NIPQUAD(from_addr.v4.sin_addr.s_addr));
+			if (net_ratelimit())
+				printk(KERN_WARNING
+				    "%s association %p could not find address "
+				    NIPQUAD_FMT "\n",
+				    __FUNCTION__,
+				    asoc,
+				    NIPQUAD(from_addr.v4.sin_addr.s_addr));
 		}
 		return SCTP_DISPOSITION_DISCARD;
 	}