47 	partial = csum_sub(csum_unfold(uh->check), partial);  in __skb_udp_tunnel_segment()
134 		uh->check = ~csum_fold(csum_add(partial,  in __skb_udp_tunnel_segment()
138 			uh->check = gso_make_checksum(skb, ~uh->check);  in __skb_udp_tunnel_segment()
139 			if (uh->check == 0)  in __skb_udp_tunnel_segment()
140 				uh->check = CSUM_MANGLED_0;  in __skb_udp_tunnel_segment()
144 			skb->csum_offset = offsetof(struct udphdr, check);  in __skb_udp_tunnel_segment()
199 	__sum16 check;  in __udp_gso_segment()  local
232 	check = csum16_add(csum16_sub(uh->check, uh->len), newlen);  in __udp_gso_segment()
245 		uh->check = check;  in __udp_gso_segment()
248 			gso_reset_checksum(seg, ~check);  in __udp_gso_segment()
250 			uh->check = gso_make_checksum(seg, ~check) ? :  in __udp_gso_segment()
260 	check = csum16_add(csum16_sub(uh->check, uh->len), newlen);  in __udp_gso_segment()
263 	uh->check = check;  in __udp_gso_segment()
266 		gso_reset_checksum(seg, ~check);  in __udp_gso_segment()
268 		uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0;  in __udp_gso_segment()
323 	uh->check = 0;  in udp4_ufo_fragment()
325 	uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum);  in udp4_ufo_fragment()
326 	if (uh->check == 0)  in udp4_ufo_fragment()
327 		uh->check = CSUM_MANGLED_0;  in udp4_ufo_fragment()
385 		    (!uh->check ^ !uh2->check)) {  in udp_gro_receive()
415 	if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,  in udp4_gro_receive()
418 	else if (uh->check)  in udp4_gro_receive()
419 		skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,  in udp4_gro_receive()
464 	if (uh->check) {  in udp4_gro_complete()
466 		uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,  in udp4_gro_complete()