Symbol: BPF_D_INOUT
sys/net/bpf.c
1311
case BPF_D_INOUT:
sys/net/bpf.c
597
d->bd_direction = BPF_D_INOUT;
usr.bin/fstat/misc.c
154
else if (bpf.bd_direction == BPF_D_INOUT)