[master] Changed severity of the log message indicating checksum errors.

Merges in rt41757.

RELNOTES

@@ -1113,6 +1113,11 @@ by Eric Young (eay@cryptsoft.com).
   this the check was performed too far down stream to be detected in test mode.
   [ISC-Bugs #29892]
 
+- Changed severity of the log message indicating UDP checksum errors in
+  the received packets from 'info' to 'debug' to avoid logging excessive
+  number of false positives when UDP checksum offloading is enabled.
+  [ISC-bugs #41757]
+
 			Changes since 4.2.0 (new features)
 
 - If a client renews before 'dhcp-cache-threshold' percent of its lease

common/packet.c

@@ -50,7 +50,7 @@ u_int32_t checksum (buf, nbytes, sum)
 	unsigned i;
 
 #ifdef DEBUG_CHECKSUM
-	log_debug ("checksum (%x %d %x)", buf, nbytes, sum);
+	log_debug ("checksum (%x %d %x)", (unsigned)buf, nbytes, sum);
 #endif
 
 	/* Checksum all the pairs of bytes first... */
@@ -366,8 +366,8 @@ decode_udp_ip_header(struct interface_info *interface,
 		udp_packets_bad_checksum++;
 		if (((udp_packets_seen > 4) && (udp_packets_bad_checksum != 0))
 		    && ((udp_packets_seen / udp_packets_bad_checksum) < 2)) {
-			log_info ("%u bad udp checksums in %u packets",
-			          udp_packets_bad_checksum, udp_packets_seen);
+			log_debug ("%u bad udp checksums in %u packets",
+			           udp_packets_bad_checksum, udp_packets_seen);
 			udp_packets_seen = udp_packets_bad_checksum = 0;
 		}
 

includes/site.h

@@ -114,6 +114,13 @@
 /* Define this if you want to debug the binary leases (lease_chain) code */
 /* #define DEBUG_BINARY_LEASES */
 
+/* Define this if you want to debug checksum calculations */
+/* #define DEBUG_CHECKSUM */
+
+/* Define this if you want to verbosely debug checksum calculations */
+/* #define DEBUG_CHECKSUM_VERBOSE */
+
+
 /* Define this if you want DHCP failover protocol support in the DHCP
    server. */