-extern u_int bt_if_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int usb_linux_48_byte_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int usb_linux_64_byte_print(const struct pcap_pkthdr *, const u_char *);
-extern void vxlan_print(const u_char *, u_int);
-extern void otv_print(const u_char *, u_int);
-extern void ahcp_print(const u_char *, const u_int);