187 	const struct gre_base_hdr *greh;  in parse_gre_header()  local
194 	greh = (struct gre_base_hdr *)skb_transport_header(skb);  in parse_gre_header()
195 	if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))  in parse_gre_header()
198 	tpi->flags = gre_flags_to_tnl_flags(greh->flags);  in parse_gre_header()
204 	greh = (struct gre_base_hdr *)skb_transport_header(skb);  in parse_gre_header()
205 	tpi->proto = greh->protocol;  in parse_gre_header()
207 	options = (__be32 *)(greh + 1);  in parse_gre_header()
208 	if (greh->flags & GRE_CSUM) {  in parse_gre_header()
219 	if (greh->flags & GRE_KEY) {  in parse_gre_header()
225 	if (unlikely(greh->flags & GRE_SEQ)) {  in parse_gre_header()
235 	if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {  in parse_gre_header()
452 	struct gre_base_hdr *greh;  in build_header()  local
457 	greh = (struct gre_base_hdr *)skb->data;  in build_header()
458 	greh->flags = tnl_flags_to_gre_flags(flags);  in build_header()
459 	greh->protocol = proto;  in build_header()
462 		__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);  in build_header()
735 	struct gre_base_hdr *greh;  in ipgre_header()  local
738 	greh = (struct gre_base_hdr *)(iph+1);  in ipgre_header()
739 	greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags);  in ipgre_header()
740 	greh->protocol = htons(type);  in ipgre_header()