sadb_x_nat_t_frag
struct sadb_x_nat_t_frag m_natt_frag;
_Static_assert(sizeof(struct sadb_x_nat_t_frag) == 8, "struct size mismatch");
[SADB_X_EXT_NAT_T_FRAG] = sizeof(struct sadb_x_nat_t_frag),
[SADB_X_EXT_NAT_T_FRAG] = sizeof(struct sadb_x_nat_t_frag),