bpf/progs/bpf_flow.c

170 	struct gre_hdr *gre, _gre;
194 		gre = bpf_flow_dissect_get_header(skb, sizeof(*gre), &_gre);
195 		if (!gre)
198 		if (bpf_htons(gre->flags & GRE_VERSION))
202 		keys->thoff += sizeof(*gre); /* Step over GRE Flags and Proto */
203 		if (GRE_IS_CSUM(gre->flags))
205 		if (GRE_IS_KEY(gre->flags))
207 		if (GRE_IS_SEQ(gre->flags))
214 		if (gre->proto == bpf_htons(ETH_P_TEB)) {
224 			return parse_eth_proto(skb, gre->proto);