[neighbour] Generalise concept of neighbour discovery

Split the protocol-independent portions of arp.c into a separate file
neighbour.c, to allow for sharing of functionality between IPv4+ARP
and IPv6+NDP.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/include/ipxe/neighbour.h b/src/include/ipxe/neighbour.h
new file mode 100644
index 000000000..5720e8b0f
--- /dev/null
+++ b/src/include/ipxe/neighbour.h
@@ -0,0 +1,44 @@
+#ifndef _IPXE_NEIGHBOUR_H
+#define _IPXE_NEIGHBOUR_H
+
+/** @file
+ *
+ * Neighbour discovery
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/netdevice.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 );
+};
+
+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 */