Checksum computation!

[dccp2tcp] / encap.c

diff --git a/encap.c b/encap.c
index f729878763594e9ceb9d5f6f5809f1670f4793ee..f583f0994303568d4aeb2d62ffc19f99a7e594aa 100644 (file)
--- a/encap.c
+++ b/encap.c
@@ -23,12 +23,12 @@ Date: 11/2012
 Notes:
        1)CCID2 ONLY
        2)DCCP MUST use 48 bit sequence numbers
-       3)Checksums are not computed (they are zeroed)
-       4)DCCP DATA packets are not implemented (Linux doesn't use them)
-       5)DCCP Ack packets show up as TCP packets containing one byte
+       3)DCCP DATA packets are not implemented (Linux doesn't use them)
+       4)DCCP Ack packets show up as TCP packets containing one byte
 ******************************************************************************/
 #include "dccp2tcp.h"
 #include "encap.h"
+#include "checksums.h"
 #include <pcap/sll.h>
 #include <netinet/ip6.h>
 
@@ -279,6 +279,10 @@ int ipv4_encap(struct packet *new, const struct const_packet *old)
                /*Adjust IPv4 header to account for packet's total length*/
                iph->tot_len=htons(new->length);
 
+               /*Compute IPv4 Checksum*/
+               iph->check=0;
+               iph->check=ipv4_chksum(new->data,iph->ihl*4);
+
                /*Cleanup*/
                free(nnew.src_id);
                free(nnew.dest_id);