- //create pseudo header
- memset(&hdr, 0, sizeof(struct ip4_pseudo_hdr));
- memcpy(hdr.src, src, IP4_ADDR_LEN);
- memcpy(hdr.dest, dest, IP4_ADDR_LEN);
- hdr.nxt=type;
- hdr.len=htonl(len);
+ /*IP header*/
+ ip4hdr=NULL;
+ if(ip_type==AF_INET){
+ ip_hdr_len=sizeof(struct iphdr);
+ ip4hdr=(struct iphdr*)buffer;
+ ip4hdr->check=htons(0);
+ memcpy(&ip4hdr->daddr, &dest_addr.ipv4->sin_addr, sizeof(dest_addr.ipv4->sin_addr));
+ ip4hdr->frag_off=htons(0);
+ ip4hdr->id=htons(1);//first
+ ip4hdr->ihl=5;
+ ip4hdr->protocol=IPPROTO_DCCP;
+ memcpy(&ip4hdr->saddr, &src_addr.ipv4->sin_addr, sizeof(src_addr.ipv4->sin_addr));
+ ip4hdr->tos=0;
+ ip4hdr->tot_len=htons(ip_hdr_len+dccp_hdr_len);
+ ip4hdr->ttl=ttl;
+ ip4hdr->version=4;
+ }else{
+ ip_hdr_len=sizeof(struct ip6_hdr);
+ ip6hdr=(struct ip6_hdr*)buffer;
+ memcpy(&ip6hdr->ip6_dst, &dest_addr.ipv6->sin6_addr, sizeof(dest_addr.ipv6->sin6_addr));
+ memcpy(&ip6hdr->ip6_src, &src_addr.ipv6->sin6_addr, sizeof(src_addr.ipv6->sin6_addr));
+ ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_flow=htonl(6<<28); //version, traffic class, flow label
+ ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_hlim=ttl;
+ ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_nxt=IPPROTO_DCCP;
+ ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_plen=htons(dccp_hdr_len);
+ }