/* udp.h - Declarations pertaining to User Datagram Protocol (UDP) */

#define UDP_SLOTS       6               /* Number of open UDP endpoints */
#define UDP_QSIZ        8               /* Packets enqueued per endpoint*/

#define UDP_DHCP_CPORT  68              /* Port number for DHCP client  */
#define UDP_DHCP_SPORT  67              /* Port number for DHCP server  */

/* Constants for the state of an entry */

#define UDP_FREE        0               /* Entry is unused              */
#define UDP_USED        1               /* Entry is being used          */
#define UDP_RECV        2               /* Entry has a process waiting  */

#define UDP_ANYIF       -2              /* Register an endpoint for any */
                                        /*   interface on the machine   */

#define UDP_HDR_LEN     8               /* Bytes in a UDP header        */

struct  udpentry {                      /* Entry in the UDP endpoint tbl*/
        int32   udstate;                /* State of entry: free/used    */
        uint32  udremip;                /* Remote IP address (zero      */
                                        /*   means "don't care")        */
        uint16  udremport;              /* Remote protocol port number  */
        uint16  udlocport;              /* Local protocol port number   */
        int32   udhead;                 /* Index of next packet to read */
        int32   udtail;                 /* Index of next slot to insert */
        int32   udcount;                /* Count of packets enqueued    */
        pid32   udpid;                  /* ID of waiting process        */
        struct  netpacket *udqueue[UDP_QSIZ];/* Circular packet queue   */
};

extern  struct  udpentry udptab[];