IN6P_HOPLIMIT
IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
OPTSET2292(IN6P_HOPLIMIT);
optval = OPTBIT(IN6P_HOPLIMIT);
optval = OPTBIT(IN6P_HOPLIMIT);