Filter: fixed eattr cached pointer
Use ACCESS_RTE to guard **f_rte, use ACCESS_EATTRS to guard **f_eattrs. Use f_rta_cow() before writing to rta or eattrs, use f_rte_cow() before writing preference (stored in rte). Do not access eattrs indirectly through (*f_rte)->attrs->eattrs, it is way too slow. The cached pointer is faster.
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