in4_cksum        5303 net/pf.c       			sum = in4_cksum(m, p, off, len);
in4_cksum         620 netinet/in.h   int	   in4_cksum(struct mbuf *, u_int8_t, int, int);
in4_cksum        2030 netinet/ip_output.c 	csum = in4_cksum(m, 0, offset, m->m_pkthdr.len - offset);
in4_cksum         493 netinet/tcp_input.c 			if (in4_cksum(m, IPPROTO_TCP, iphlen, tlen) != 0) {
in4_cksum         299 netinet/udp_usrreq.c 			if ((uh->uh_sum = in4_cksum(m, IPPROTO_UDP,