Checksums: ipv4 diff not needed; minip4: enable icmp, arp

bin/checksum_delta_diff_test.py

@@ -27,6 +27,9 @@ def checksum_scapy(pkt):
 # Only the diff between v4 and v6 "counts"
 #
 
+# b)
+# Not needed
+
 def sum_for_udp(packet):
     sums = ""
     sums += struct.pack("H", packet[UDP].sport)
@@ -78,6 +81,30 @@ def sum_for_v4(packet):
 
     return sums
 
+def sum_for_v4_from_v6(packet):
+    	#     update_checksum(meta.chk_ipv4 == 1,
+        #     {
+        #         hdr.ipv4.version,
+	#         hdr.ipv4.ihl,
+        #         hdr.ipv4.diff_serv,
+        #         hdr.ipv4.ecn,
+        #         hdr.ipv4.totalLen,
+        #         hdr.ipv4.identification,
+        #         hdr.ipv4.flags,
+        #         hdr.ipv4.fragOffset,
+        #         hdr.ipv4.ttl,
+        #         hdr.ipv4.protocol,
+        #         hdr.ipv4.src_addr,
+        #         hdr.ipv4.dst_addr
+        #     },
+        #     hdr.ipv4.hdrChecksum,
+        #     HashAlgorithm.csum16
+        # );
+
+    pass
+
+
+
 if __name__ == '__main__':
     p = []
 
@@ -174,3 +201,5 @@ if __name__ == '__main__':
 
         print("Translating v4 to v6, expected v6 UDP checksum: {}".format(
             checksums["ipv4"] + header_diff_from_v6))
+
+        # Generate the IPv4 header checksum from IPv6: