static void sliplink_print(const u_char *, const struct ip *, u_int);
static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
static void sliplink_print(const u_char *, const struct ip *, u_int);
static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);