ipt_oflw          146 netinet/ip.h   		 ipt_oflw:4;		/* overflow counter */
ipt_oflw          149 netinet/ip.h   	u_int    ipt_oflw:4,		/* overflow counter */
ipt_oflw         1159 netinet/ip_input.c 				if (++ipt.ipt_oflw == 0)