sys/netinet6/udp6_usrreq.c

205 	uint16_t uh_sum;
244 		if (uh->uh_sum == 0) {
253 		if (uh->uh_sum == 0) {
262 			uh_sum = m->m_pkthdr.csum_data;
264 			uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
266 		uh_sum ^= 0xffff;
268 		uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
270 	if (uh_sum != 0) {
831 	udp6->uh_sum = 0;
846 			if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
848 				udp6->uh_sum = 0xffff;
850 			udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
852 			m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);