147 		next_off = sizeof(struct iphdr) + offsetof(struct iphdr, protocol);  in setup_sock_filter()
149 		next_off = offsetof(struct iphdr, protocol);  in setup_sock_filter()
281 	struct iphdr *iph = buf;  in fill_networklayer()
302 				payload_len + sizeof(struct iphdr));  in fill_networklayer()
308 		iph->check = checksum_fold(buf, sizeof(struct iphdr), 0);  in fill_networklayer()
352 		fill_networklayer(buf + ETH_HLEN, payload_len + sizeof(struct iphdr),  in create_packet()
354 		fill_networklayer(buf + ETH_HLEN + sizeof(struct iphdr),  in create_packet()
473 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in recompute_packet()
485 		iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in recompute_packet()
491 			iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in recompute_packet()
658 	struct iphdr *iph;  in add_ipv4_ts_option()
672 	iph = (struct iphdr *)(optpkt + ETH_HLEN);  in add_ipv4_ts_option()
676 	iph->check = checksum_fold(iph, sizeof(struct iphdr) + optlen, 0);  in add_ipv4_ts_option()
698 static void fix_ip4_checksum(struct iphdr *iph)  in fix_ip4_checksum()
701 	iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in fix_ip4_checksum()
711 	struct iphdr *iph1;  in send_flush_id_case()
712 	struct iphdr *iph2;  in send_flush_id_case()
713 	struct iphdr *iph3;  in send_flush_id_case()
715 	iph1 = (struct iphdr *)(buf1 + ETH_HLEN);  in send_flush_id_case()
716 	iph2 = (struct iphdr *)(buf2 + ETH_HLEN);  in send_flush_id_case()
717 	iph3 = (struct iphdr *)(buf3 + ETH_HLEN);  in send_flush_id_case()
835 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_fragment4()
852 	iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_fragment4()
861 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_changed_ttl()
869 	iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_changed_ttl()
878 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_changed_tos()
888 		iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_changed_tos()
900 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_changed_ECN()
909 		iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_changed_ECN()
1001 	struct iphdr *iph = (struct iphdr *)(buffer + ETH_HLEN);  in check_recv_pkts()
1041 				- sizeof(struct tcphdr) - sizeof(struct iphdr);  in check_recv_pkts()
1474 		tcp_offset = ETH_HLEN + sizeof(struct iphdr) * 2;  in main()
1477 		tcp_offset = ETH_HLEN + sizeof(struct iphdr);  in main()