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