ifs_bits 90 netinet6/ip6_mroute.h if_mask ifs_bits[howmany(IF_SETSIZE, NIFBITS)]; ifs_bits 93 netinet6/ip6_mroute.h #define IF_SET(n, p) ((p)->ifs_bits[(n)/NIFBITS] |= (1 << ((n) % NIFBITS))) ifs_bits 94 netinet6/ip6_mroute.h #define IF_CLR(n, p) ((p)->ifs_bits[(n)/NIFBITS] &= ~(1 << ((n) % NIFBITS))) ifs_bits 95 netinet6/ip6_mroute.h #define IF_ISSET(n, p) ((p)->ifs_bits[(n)/NIFBITS] & (1 << ((n) % NIFBITS)))