NFNLGRP_NONE 572 net/netfilter/nfnetlink.c if (group <= NFNLGRP_NONE || group > NFNLGRP_MAX) NFNLGRP_NONE 625 net/netfilter/nfnetlink.c for (i = NFNLGRP_NONE + 1; i <= NFNLGRP_MAX; i++)