igmp_cksum        537 netinet/igmp.c 	igmp->igmp_cksum = 0;
igmp_cksum        538 netinet/igmp.c 	igmp->igmp_cksum = in_cksum(m, IGMP_MINLEN);
igmp_cksum         54 netinet/igmp.h 	u_int16_t	igmp_cksum;	/* IP-style checksum               */