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100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
#ifndef _GPXE_UDP_H
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#define _GPXE_UDP_H
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/** @file
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*
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* UDP protocol
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*
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* This file defines the gPXE UDP API.
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*
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*/
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#include <stddef.h>
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#include <gpxe/in.h>
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#include <gpxe/pkbuff.h>
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#include <gpxe/if_ether.h>
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/**
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* UDP constants
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*/
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#define UDP_HLEN 8
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#define UDP_MAX_HLEN 72
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#define UDP_MAX_TXPKB ETH_MAX_MTU
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#define UDP_MIN_TXPKB ETH_ZLEN
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typedef uint16_t port_t;
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/**
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* A UDP header
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*/
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struct udp_header {
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port_t source_port;
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port_t dest_port;
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uint16_t len;
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uint16_t chksum;
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};
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struct udp_connection;
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/**
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* UDP operations
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*
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*/
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struct udp_operations {
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/**
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* New data received
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*
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* @v conn UDP connection
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* @v data Data
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* @v len Length of data
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*/
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void ( * newdata ) ( struct udp_connection *conn,
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void *data, size_t len );
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};
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/**
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* A UDP connection
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*
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*/
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struct udp_connection {
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/** Address of the remote end of the connection */
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struct sockaddr sin;
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/** Local port on which the connection receives packets */
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port_t local_port;
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/** Transmit buffer */
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struct pk_buff *tx_pkb;
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/** List of registered connections */
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struct list_head list;
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/** Operations table for this connection */
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struct udp_operations *udp_op;
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};
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/**
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* List of registered UDP connections
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*/
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static LIST_HEAD ( udp_conns );
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/**
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* Functions provided to the application layer
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*/
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extern void udp_init ( struct udp_connection *conn, struct udp_operations *udp_op );
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extern int udp_open ( struct udp_connection *conn, uint16_t local_port );
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extern void udp_connect ( struct udp_connection *conn, struct sockaddr *peer );
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extern void udp_close ( struct udp_connection *conn );
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extern int udp_send ( struct udp_connection *conn, const void *data, size_t len );
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extern int udp_sendto ( struct udp_connection *conn, struct sockaddr *peer, const void *data, size_t len );
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static inline void * udp_buffer ( struct udp_connection *conn ) {
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return conn->tx_pkb->data;
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}
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static inline int udp_buflen ( struct udp_connection *conn ) {
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return pkb_len ( conn->tx_pkb );
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}
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#endif /* _GPXE_UDP_H */
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