65 	const struct gre_base_hdr *greh;  in gre_parse_header()  local
72 	greh = (struct gre_base_hdr *)(skb->data + nhs);  in gre_parse_header()
73 	if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))  in gre_parse_header()
76 	tpi->flags = gre_flags_to_tnl_flags(greh->flags);  in gre_parse_header()
82 	greh = (struct gre_base_hdr *)(skb->data + nhs);  in gre_parse_header()
83 	tpi->proto = greh->protocol;  in gre_parse_header()
85 	options = (__be32 *)(greh + 1);  in gre_parse_header()
86 	if (greh->flags & GRE_CSUM) {  in gre_parse_header()
98 	if (greh->flags & GRE_KEY) {  in gre_parse_header()
104 	if (unlikely(greh->flags & GRE_SEQ)) {  in gre_parse_header()
114 	if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {  in gre_parse_header()
131 	if ((greh->protocol == htons(ETH_P_ERSPAN) && hdr_len != 4) ||  in gre_parse_header()
132 	    greh->protocol == htons(ETH_P_ERSPAN2)) {  in gre_parse_header()