vxlan_header
m0->m_pkthdr.l5hlen = sizeof(struct vxlan_header);
sizeof(struct udphdr) + sizeof(struct vxlan_header));
struct vxlan_header vxlh_hdr;
struct vxlan_header *vxh;
struct vxlan_header *vxh, vxlanhdr;
if (m->m_pkthdr.len < offset + sizeof(struct vxlan_header))
if (__predict_false(m->m_len < offset + sizeof(struct vxlan_header))) {
m_copydata(m, offset, sizeof(struct vxlan_header),
m_adj_decap(m, offset + sizeof(struct vxlan_header));
sizeof(struct vxlan_header) - \
const struct vxlan_header *vxh;