ICMP6_STAT_OUTERRHIST
icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0);
icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code);
#define p_oerr(f, m) if (icmp6stat[ICMP6_STAT_OUTERRHIST + f] || sflag <= 1) \
(unsigned long long)icmp6stat[ICMP6_STAT_OUTERRHIST + f])