Integrate "task #7272 : LWIP_ICMP option". The new option LWIP_ICMP enable/disable ICMP module inside the IP stack (enable per default). Be careful, disabling ICMP make your product non-compliant to RFC1122, but help to reduce footprint, and to reduce "visibility" on the Internet.

src/include/ipv4/lwip/icmp.h

@@ -40,6 +40,8 @@
 #include "lwip/ip_addr.h"
 #include "lwip/netif.h"
 
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -116,5 +118,6 @@ PACK_STRUCT_END
 }
 #endif
 
+#endif /* LWIP_ICMP */
+
 #endif /* __LWIP_ICMP_H__ */
-    

src/include/ipv6/lwip/icmp.h

@@ -39,6 +39,8 @@
 
 #include "lwip/netif.h"
 
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -94,5 +96,7 @@ struct icmp_te_hdr {
 }
 #endif
 
+#endif /* LWIP_ICMP */
+
 #endif /* __LWIP_ICMP_H__ */
-    
+

src/include/lwip/opt.h

@@ -403,6 +403,14 @@
    ---------- ICMP options ----------
    ----------------------------------
 */
+/**
+ * LWIP_ICMP==1: Enable ICMP module inside the IP stack.
+ * Be careful, disable that make your product non-compliant to RFC1122
+ */
+#ifndef LWIP_ICMP
+#define LWIP_ICMP                       1
+#endif
+
 /**
  * ICMP_TTL: Default value for Time-To-Live used by ICMP packets.
  */