69 	const struct gre_base_hdr *greh;  in gre_parse_header()  local
76 	greh = (struct gre_base_hdr *)(skb->data + nhs);  in gre_parse_header()
77 	if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))  in gre_parse_header()
80 	tpi->flags = gre_flags_to_tnl_flags(greh->flags);  in gre_parse_header()
86 	greh = (struct gre_base_hdr *)(skb->data + nhs);  in gre_parse_header()
87 	tpi->proto = greh->protocol;  in gre_parse_header()
89 	options = (__be32 *)(greh + 1);  in gre_parse_header()
90 	if (greh->flags & GRE_CSUM) {  in gre_parse_header()
102 	if (greh->flags & GRE_KEY) {  in gre_parse_header()
108 	if (unlikely(greh->flags & GRE_SEQ)) {  in gre_parse_header()
118 	if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {  in gre_parse_header()