dccp: reset packet

*** 1646,1655 ****
--- 1646,1658 ----
  #ifdef  DEBUG
                  if (!skip_sctp_cksum)
  #endif
                          sctph->sh_chksum = sctp_cksum(mp, ip_hdr_length);
                  goto ip_hdr_cksum;
+         } else if (protocol == IPPROTO_DCCP) {
+                 cksump = IPH_DCCPH_CHECKSUMP(ipha, ip_hdr_length);
+                 cksum = IP_DCCP_CSUM_COMP;
          } else {
                  goto ip_hdr_cksum;
          }
  
          /* ULP puts the checksum field is in the first mblk */
*** 1735,1744 ****
--- 1738,1750 ----
  #ifdef  DEBUG
                  if (!skip_sctp_cksum)
  #endif
                          sctph->sh_chksum = sctp_cksum(mp, ip_hdr_length);
                  goto ip_hdr_cksum;
+         } else if (protocol == IPPROTO_DCCP) {
+                 cksump = IPH_DCCPH_CHECKSUMP(ipha, ip_hdr_length);
+                 cksum = IP_DCCP_CSUM_COMP;
          } else {
          ip_hdr_cksum:
                  /* Calculate IPv4 header checksum */
                  ipha->ipha_hdr_checksum = 0;
                  ipha->ipha_hdr_checksum = ip_csum_hdr(ipha);