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unixcpio.gz
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unixnet.cpio
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udp.h
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C/C++ Source or Header
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1994-07-11
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1KB
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41 lines
/* User Datagram Protocol definitions */
#define NUDP 20
/* Structure of a UDP protocol header */
struct udp {
int16 source; /* Source port */
int16 dest; /* Destination port */
int16 length; /* Length of header and data */
int16 checksum; /* Checksum over pseudo-header, header and data */
};
#define UDPHDR 8 /* Length of UDP header */
/* User Datagram Protocol control block
* Each entry on the receive queue consists of the
* remote socket structure, followed by any data
*/
struct udp_cb {
struct udp_cb *prev; /* Linked list pointers */
struct udp_cb *next;
struct socket socket; /* Local port accepting datagrams */
void (*r_upcall)(); /* Function to call when one arrives */
struct mbuf *rcvq; /* Queue of pending datagrams */
int rcvcnt; /* Count of pending datagrams */
};
extern struct udp_cb *udps[]; /* Hash table for UDP structures */
#define NULLUDP (struct udp_cb *)0
/* UDP statistics counters */
struct udp_stat {
int16 rcvd; /* Packets received */
int16 sent; /* Packets sent */
int16 cksum; /* Checksum errors */
int16 unknown; /* Unknown socket */
int16 bdcsts; /* Incoming broadcasts */
};
/* UDP primitives */
int open_udp(),recv_udp(),send_udp(),del_udp();
void udp_dump();