struct buffer *make_buffered_packet_out(uint32_t buffer_id,
uint16_t in_port, uint16_t out_port);
struct buffer *make_unbuffered_packet_out(const struct buffer *packet,
uint16_t in_port, uint16_t out_port);
struct buffer *make_buffered_packet_out(uint32_t buffer_id,
uint16_t in_port, uint16_t out_port);
struct buffer *make_unbuffered_packet_out(const struct buffer *packet,
uint16_t in_port, uint16_t out_port);