89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
#ifndef _IPXE_NEIGHBOUR_H
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#define _IPXE_NEIGHBOUR_H
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/** @file
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*
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* Neighbour discovery
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#include <ipxe/refcnt.h>
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#include <ipxe/list.h>
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#include <ipxe/netdevice.h>
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#include <ipxe/retry.h>
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/** A neighbour discovery protocol */
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struct neighbour_discovery {
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/** Name */
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const char *name;
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/**
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* Transmit neighbour discovery request
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*
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* @v netdev Network device
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* @v net_protocol Network-layer protocol
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* @v net_dest Destination network-layer address
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* @v net_source Source network-layer address
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* @ret rc Return status code
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*/
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int ( * tx_request ) ( struct net_device *netdev,
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struct net_protocol *net_protocol,
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const void *net_dest, const void *net_source );
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};
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/** A neighbour cache entry */
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struct neighbour {
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/** Reference count */
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struct refcnt refcnt;
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/** List of neighbour cache entries */
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struct list_head list;
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/** Network device */
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struct net_device *netdev;
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/** Network-layer protocol */
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struct net_protocol *net_protocol;
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/** Network-layer destination address */
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uint8_t net_dest[MAX_NET_ADDR_LEN];
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/** Link-layer destination address */
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uint8_t ll_dest[MAX_LL_ADDR_LEN];
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/** Neighbour discovery protocol (if any) */
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struct neighbour_discovery *discovery;
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/** Network-layer source address (if any) */
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uint8_t net_source[MAX_NET_ADDR_LEN];
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/** Retransmission timer */
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struct retry_timer timer;
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/** Pending I/O buffers */
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struct list_head tx_queue;
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};
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/**
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* Test if neighbour cache entry has a valid link-layer address
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*
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* @v neighbour Neighbour cache entry
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* @ret has_ll_dest Neighbour cache entry has a valid link-layer address
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*/
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static inline __attribute__ (( always_inline )) int
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neighbour_has_ll_dest ( struct neighbour *neighbour ) {
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return ( ! timer_running ( &neighbour->timer ) );
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}
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extern struct list_head neighbours;
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extern int neighbour_tx ( struct io_buffer *iobuf, struct net_device *netdev,
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struct net_protocol *net_protocol,
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const void *net_dest,
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struct neighbour_discovery *discovery,
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const void *net_source, const void *ll_source );
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extern int neighbour_update ( struct net_device *netdev,
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struct net_protocol *net_protocol,
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const void *net_dest, const void *ll_dest );
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extern int neighbour_define ( struct net_device *netdev,
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struct net_protocol *net_protocol,
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const void *net_dest, const void *ll_dest );
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#endif /* _IPXE_NEIGHBOUR_H */
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