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#ifndef BACKGROUND_H
#define BACKGROUND_H
/** @file
*
* Background protocols
*
* Some protocols (e.g. ARP, IGMP) operate in the background; the
* upper layers are not aware of their operation. When an ARP query
* for the local station's IP address arrives, Etherboot must reply to
* it regardless of what other operations are currently in progress.
*
* Background protocols are called in two circumstances: when
* Etherboot is about to poll for a packet, and when Etherboot has
* received a packet that the upper layer (whatever that may currently
* be) isn't interested in.
*
*/
#include <gpxe/tables.h>
#include "ip.h"
/** A background protocol */
struct background {
/** Send method
*
* This method will be called whenever Etherboot is about to
* poll for a packet. The background protocol should use this
* method to send out any periodic transmissions that it may
* require.
*/
void ( *send ) ( unsigned long timestamp );
/** Process method
*
* This method will be called whenever Etherboot has received
* a packet and doesn't know what to do with it.
*/
void ( *process ) ( unsigned long timestamp, unsigned short ptype,
struct iphdr *ip );
};
/** A member of the background protocols table */
#define __background __table ( background, 01 )
/* Functions in background.c */
extern void background_send ( unsigned long timestamp );
extern void background_process ( unsigned long timestamp, unsigned short ptype,
struct iphdr *ip );
#endif /* BACKGROUND_H */
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