Symbol: IPF_IS_LOOPBACK
usr/src/uts/common/inet/ipf/netinet/ip_compat.h
244
# define IPF_IS_LOOPBACK(f) ((f) & FI_NOCKSUM)
usr/src/uts/common/inet/ipf/netinet/ip_compat.h
2498
# define IPF_IS_LOOPBACK(x) 0