120 		next_off = sizeof(struct iphdr) + offsetof(struct iphdr, protocol);  in setup_sock_filter()
122 		next_off = offsetof(struct iphdr, protocol);  in setup_sock_filter()
254 	struct iphdr *iph = buf;  in fill_networklayer()
275 				payload_len + sizeof(struct iphdr));  in fill_networklayer()
281 		iph->check = checksum_fold(buf, sizeof(struct iphdr), 0);  in fill_networklayer()
325 		fill_networklayer(buf + ETH_HLEN, payload_len + sizeof(struct iphdr),  in create_packet()
327 		fill_networklayer(buf + ETH_HLEN + sizeof(struct iphdr),  in create_packet()
420 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in recompute_packet()
432 		iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in recompute_packet()
438 			iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in recompute_packet()
605 	struct iphdr *iph;  in add_ipv4_ts_option()
619 	iph = (struct iphdr *)(optpkt + ETH_HLEN);  in add_ipv4_ts_option()
623 	iph->check = checksum_fold(iph, sizeof(struct iphdr) + optlen, 0);  in add_ipv4_ts_option()
645 static void fix_ip4_checksum(struct iphdr *iph)  in fix_ip4_checksum()
648 	iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in fix_ip4_checksum()
657 	struct iphdr *iph1;  in send_flush_id_case()
658 	struct iphdr *iph2;  in send_flush_id_case()
659 	struct iphdr *iph3;  in send_flush_id_case()
661 	iph1 = (struct iphdr *)(buf1 + ETH_HLEN);  in send_flush_id_case()
662 	iph2 = (struct iphdr *)(buf2 + ETH_HLEN);  in send_flush_id_case()
663 	iph3 = (struct iphdr *)(buf3 + ETH_HLEN);  in send_flush_id_case()
789 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_fragment4()
806 	iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_fragment4()
815 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_changed_ttl()
823 	iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_changed_ttl()
832 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_changed_tos()
842 		iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_changed_tos()
854 	struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);  in send_changed_ECN()
863 		iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);  in send_changed_ECN()
933 	struct iphdr *iph = (struct iphdr *)(buffer + ETH_HLEN);  in check_recv_pkts()
973 				- sizeof(struct tcphdr) - sizeof(struct iphdr);  in check_recv_pkts()
1345 		tcp_offset = ETH_HLEN + sizeof(struct iphdr) * 2;  in main()
1348 		tcp_offset = ETH_HLEN + sizeof(struct iphdr);  in main()