44 	partial = csum_sub(csum_unfold(uh->check), partial);  in __skb_udp_tunnel_segment()
131 		uh->check = ~csum_fold(csum_add(partial,  in __skb_udp_tunnel_segment()
135 			uh->check = gso_make_checksum(skb, ~uh->check);  in __skb_udp_tunnel_segment()
136 			if (uh->check == 0)  in __skb_udp_tunnel_segment()
137 				uh->check = CSUM_MANGLED_0;  in __skb_udp_tunnel_segment()
141 			skb->csum_offset = offsetof(struct udphdr, check);  in __skb_udp_tunnel_segment()
200 	if (uh->check) {  in __udpv4_gso_segment_csum()
201 		inet_proto_csum_replace4(&uh->check, seg, *oldip, *newip,  in __udpv4_gso_segment_csum()
203 		inet_proto_csum_replace2(&uh->check, seg, *oldport, *newport,  in __udpv4_gso_segment_csum()
205 		if (!uh->check)  in __udpv4_gso_segment_csum()
206 			uh->check = CSUM_MANGLED_0;  in __udpv4_gso_segment_csum()
210 	csum_replace4(&iph->check, *oldip, *newip);  in __udpv4_gso_segment_csum()
269 	__sum16 check;  in __udp_gso_segment()  local
310 	check = csum16_add(csum16_sub(uh->check, uh->len), newlen);  in __udp_gso_segment()
323 		uh->check = check;  in __udp_gso_segment()
326 			gso_reset_checksum(seg, ~check);  in __udp_gso_segment()
328 			uh->check = gso_make_checksum(seg, ~check) ? :  in __udp_gso_segment()
338 	check = csum16_add(csum16_sub(uh->check, uh->len), newlen);  in __udp_gso_segment()
341 	uh->check = check;  in __udp_gso_segment()
344 		gso_reset_checksum(seg, ~check);  in __udp_gso_segment()
346 		uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0;  in __udp_gso_segment()
401 	uh->check = 0;  in udp4_ufo_fragment()
403 	uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum);  in udp4_ufo_fragment()
404 	if (uh->check == 0)  in udp4_ufo_fragment()
405 		uh->check = CSUM_MANGLED_0;  in udp4_ufo_fragment()
436 	if (!uh->check) {  in udp_gro_receive_segment()
525 	    (uh->check && skb->ip_summed != CHECKSUM_PARTIAL &&  in udp_gro_receive()
546 		    (!uh->check ^ !uh2->check)) {  in udp_gro_receive()
586 	if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,  in udp4_gro_receive()
589 	else if (uh->check)  in udp4_gro_receive()
613 	skb->csum_offset = offsetof(struct udphdr, check);  in udp_gro_complete_segment()
639 		skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM  in udp_gro_complete()
682 	if (uh->check)  in udp4_gro_complete()
683 		uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,  in udp4_gro_complete()