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33 lines
1.2 KiB
33 lines
1.2 KiB
/* udp.h - Declarations pertaining to User Datagram Protocol (UDP) */ |
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#define UDP_SLOTS 6 /* Number of open UDP endpoints */ |
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#define UDP_QSIZ 8 /* Packets enqueued per endpoint*/ |
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#define UDP_DHCP_CPORT 68 /* Port number for DHCP client */ |
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#define UDP_DHCP_SPORT 67 /* Port number for DHCP server */ |
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/* Constants for the state of an entry */ |
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#define UDP_FREE 0 /* Entry is unused */ |
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#define UDP_USED 1 /* Entry is being used */ |
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#define UDP_RECV 2 /* Entry has a process waiting */ |
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#define UDP_ANYIF -2 /* Register an endpoint for any */ |
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/* interface on the machine */ |
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#define UDP_HDR_LEN 8 /* Bytes in a UDP header */ |
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struct udpentry { /* Entry in the UDP endpoint tbl*/ |
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int32 udstate; /* State of entry: free/used */ |
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uint32 udremip; /* Remote IP address (zero */ |
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/* means "don't care") */ |
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uint16 udremport; /* Remote protocol port number */ |
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uint16 udlocport; /* Local protocol port number */ |
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int32 udhead; /* Index of next packet to read */ |
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int32 udtail; /* Index of next slot to insert */ |
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int32 udcount; /* Count of packets enqueued */ |
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pid32 udpid; /* ID of waiting process */ |
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struct netpacket *udqueue[UDP_QSIZ];/* Circular packet queue */ |
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}; |
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extern struct udpentry udptab[];
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