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