745 	struct iphdr *ip_hdr = (struct iphdr *)(pkt_data +  in gen_eth_hdr_data()  local
755 	ip_hdr->version = IPVERSION;  in gen_eth_hdr_data()
756 	ip_hdr->ihl = 0x5; /* 20 byte header */  in gen_eth_hdr_data()
757 	ip_hdr->tos = 0x0;  in gen_eth_hdr_data()
758 	ip_hdr->tot_len = htons(IP_PKT_SIZE);  in gen_eth_hdr_data()
759 	ip_hdr->id = 0;  in gen_eth_hdr_data()
760 	ip_hdr->frag_off = 0;  in gen_eth_hdr_data()
761 	ip_hdr->ttl = IPDEFTTL;  in gen_eth_hdr_data()
762 	ip_hdr->protocol = IPPROTO_UDP;  in gen_eth_hdr_data()
763 	ip_hdr->saddr = htonl(0x0a0a0a10);  in gen_eth_hdr_data()
764 	ip_hdr->daddr = htonl(0x0a0a0a20);  in gen_eth_hdr_data()
767 	ip_hdr->check = 0;  in gen_eth_hdr_data()
768 	ip_hdr->check = ip_fast_csum((const void *)ip_hdr, ip_hdr->ihl);  in gen_eth_hdr_data()
781 	udp_hdr->check = udp_csum(ip_hdr->saddr, ip_hdr->daddr, UDP_PKT_SIZE,  in gen_eth_hdr_data()