ip6_setpktopt
static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, kauth_cred_t,
return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),