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>

2 files changed, 17 insertions, 14 deletions

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 1907318e70f..8d789008349 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/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:
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 350d4765472..276e26d3d7d 100644
--- a/net/sctp/sm_statefuns.c
+++ b/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;
         }