M_PROTO1
#define M_ENCAP M_PROTO1 /* 802.11 encap done */
#define M_AMPDU M_PROTO1 /* A-MPDU subframe */
m->m_flags |= M_PROTO1; /* mark as incoming packet */
dir = (m->m_flags & M_PROTO1)? 1 : 0;
#define M_IGMPV2 M_PROTO1 /* Packet is IGMPv2 */
#define M_NOTIFICATION M_PROTO1 /* SCTP notification */
#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */
#define M_MLDV1 M_PROTO1 /* Packet is MLDv1 */
#define M_PUSH M_PROTO1 /* Do a 'push'. */
(M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8|\
#define M_NOTREADY M_PROTO1 /* m_data not populated yet */