ENC_HDRLEN
bpfattach(&ifp->if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
ifp->if_hdrlen = ENC_HDRLEN;
ENC_HDRLEN, m, BPF_DIRECTION_OUT);
ENC_HDRLEN, m, BPF_DIRECTION_OUT);
ENC_HDRLEN, m, BPF_DIRECTION_OUT);
ENC_HDRLEN, m, BPF_DIRECTION_IN);
if (buflen < offset + ENC_HDRLEN + sizeof(*ip))
offset += ENC_HDRLEN;
default_print(p, caplen - ENC_HDRLEN);
if (caplen < ENC_HDRLEN) {
length -= ENC_HDRLEN;
p += ENC_HDRLEN;
if (buflen < offset + ENC_HDRLEN + sizeof(*ip))
offset += ENC_HDRLEN;