227 	struct udphdr *uh = _uh;  in build_packet_udp()  local
229 	uh->source = htons(cfg_port_src);  in build_packet_udp()
230 	uh->dest = htons(cfg_port_dst);  in build_packet_udp()
231 	uh->len = htons(sizeof(*uh) + cfg_payload_len);  in build_packet_udp()
232 	uh->check = 0;  in build_packet_udp()
236 		uh->source = 0;  in build_packet_udp()
237 		uh->source = checksum(uh, IPPROTO_UDP, sizeof(*uh) + cfg_payload_len);  in build_packet_udp()
240 			cfg_port_src, ntohs(uh->source));  in build_packet_udp()
241 		cfg_port_src = ntohs(uh->source);  in build_packet_udp()
245 		uh->check = 0;  in build_packet_udp()
247 		uh->check = checksum(uh, IPPROTO_UDP, sizeof(*uh) + cfg_payload_len);  in build_packet_udp()
250 		uh->check = ~uh->check;  in build_packet_udp()
252 	fprintf(stderr, "tx: sending checksum: 0x%x\n", uh->check);  in build_packet_udp()
253 	return uh + 1;  in build_packet_udp()
276 	struct udphdr *uh = _uh;  in build_packet_udp_encap()  local
277 	struct udp_encap_hdr *eh = _uh + sizeof(*uh);  in build_packet_udp_encap()
282 	uh->dest = htons(cfg_port_dst);  in build_packet_udp_encap()
283 	uh->source = htons(cfg_port_src_encap);  in build_packet_udp_encap()
284 	uh->check = 0;  in build_packet_udp_encap()
285 	uh->len = htons(sizeof(*uh) +  in build_packet_udp_encap()