gre_calc_hlen
return gre_calc_hlen(e->tun_info->key.tun_flags);
hdr_len = gre_calc_hlen(tpi->flags);
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
tunnel_hlen = gre_calc_hlen(key->tun_flags);
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
tun_hlen = gre_calc_hlen(flags);
return gre_calc_hlen(flags);
hdrlen = gre_calc_hlen(tflags);
gre_hdrlen = gre_calc_hlen(tflags);
gre_hdrlen = gre_calc_hlen(tflags);
mtu -= gre_calc_hlen(tflags);
mtu -= gre_calc_hlen(tflags);