lwip: Added KConfig option to control checksum validation on IP/UDP/ICMP

This maintains the current default, but could be swapped if desired

Merges https://github.com/espressif/esp-idf/pull/6187

components/lwip/Kconfig

@@ -559,6 +559,28 @@ menu "LWIP"
 
     endmenu # UDP
 
+    menu "Checksums"
+
+        config LWIP_CHECKSUM_CHECK_IP
+            bool "Enable LWIP IP checksums"
+            default n
+            help
+                Enable checksum checking for received IP messages
+
+        config LWIP_CHECKSUM_CHECK_UDP
+            bool "Enable LWIP UDP checksums"
+            default n
+            help
+                Enable checksum checking for received UDP messages
+
+        config LWIP_CHECKSUM_CHECK_ICMP
+            bool "Enable LWIP ICMP checksums"
+            default y
+            help
+                Enable checksum checking for received ICMP messages
+
+    endmenu # Checksums
+
     config LWIP_TCPIP_TASK_STACK_SIZE
         int "TCP/IP Task Stack Size"
         default 3072

components/lwip/port/esp32/include/lwipopts.h

@@ -968,8 +968,9 @@
 #define LWIP_DEBUG                      LWIP_DBG_OFF
 #define TCP_DEBUG                       LWIP_DBG_OFF
 
-#define CHECKSUM_CHECK_UDP              0
-#define CHECKSUM_CHECK_IP               0
+#define CHECKSUM_CHECK_UDP              CONFIG_LWIP_CHECKSUM_CHECK_UDP
+#define CHECKSUM_CHECK_IP               CONFIG_LWIP_CHECKSUM_CHECK_IP
+#define CHECKSUM_CHECK_ICMP             CONFIG_LWIP_CHECKSUM_CHECK_ICMP
 
 #define LWIP_NETCONN_FULLDUPLEX         1
 #define LWIP_NETCONN_SEM_PER_THREAD     1