RTAX_GENMASK
if ((hdr->rtm_addrs & (1 << RTAX_GENMASK)) != 0 &&
NEXTADDR(RTA_GENMASK, so[RTAX_GENMASK]);
getaddr(RTAX_GENMASK, *++argv, nrflags);
info.rti_info[RTAX_GENMASK] = 0;
info->rti_info[RTAX_GENMASK] = 0;
info->rti_info[RTAX_GENMASK] = ipfw_rtsocklog_handle_tablearg(