bpf_filter
extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
matched = bpf_filter(r->bpf_prog.bf_insns, pkt, pktlen, buflen);
if (bpf_filter(d->bd_wfilter, mtod(m, u_char *), len, len) == 0) {
slen = bpf_filter(d->bd_rfilter, pkt, pktlen, pktlen);
slen = bpf_filter(d->bd_rfilter, (u_char *)m, pktlen, 0);
slen = bpf_filter(d->bd_rfilter, (u_char *)&mb, pktlen, 0);
u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
len = bpf_filter(hip->prog->bpf_prog, data, totlen, totlen);
len = bpf_filter(hip->prog->bpf_prog, (u_char *)m, totlen, 0);
if (!bpf_filter(fr->fr_data, mc, wlen, 0))
ret = bpf_filter(nins != 0 ? pc : NULL, pkt, wirelen, buflen);
u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);