#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#

menu "ARP Configuration"

config NET_ARP
	bool "Address Resolution Protocol"
	default y
	select MM_IOB
	depends on NET_ETHERNET && NET_IPv4
	---help---
		This setting is currently overridden by logic in include/nuttx/net

if NET_ARP

config NET_ARPTAB_SIZE
	int "ARP table size"
	default 16
	---help---
		The size of the ARP table (in entries).

config NET_ARP_MAXAGE
	int "Max ARP entry age"
	default 120
	---help---
		The maximum age of ARP table entries measured in deciseconds.  The
		default value of 120 corresponds to 20 minutes (BSD default).

config NET_ARP_MAXAGE_UNREACHABLE
	int "Max unreachable ARP entry age"
	default 1
	---help---
		The maximum age of unreachable ARP table entries measured in
		deciseconds. During unreachable period not send a retry ARP
		request for the same destination.

config NET_ARP_IPIN
	bool "ARP address harvesting"
	default n
	---help---
		Harvest IP/MAC address mappings from the ARP table from incoming
		IP packets.  If this option is selected, CONFIG_NET_ARTAB_SIZE
		should be large enough to hold the hosts on the network.

		This option is NOT recommended on busy networks with many remote
		hosts.  On such networks the ARP table will be full most of the
		time and the MAC addresses that you want will get flushed from
		the table often.

config NET_ARP_GRATUITOUS
	bool "Gratuitous ARP address accept"
	default n
	---help---
		Accept IP/MAC address mappings from the ARP table from incoming
		Gratuitous ARP packets.  If this option is selected,
		CONFIG_NET_ARTAB_SIZE should be large enough to hold the hosts
		on the network.

config NET_ARP_SEND
	bool "ARP send"
	default !NET_ARP_SEND_QUEUE
	---help---
		Enable logic to send ARP requests if the target IP address mapping
		does not appear in the ARP table.

config NET_ARP_SEND_QUEUE
	bool "Iob queue in arp entry support"
	default n
	depends on IOB_NCHAINS > 0
	---help---
		Enable queue iob to arp entry when arp_out failed to wait for arp
		finished, then resend queue iobs.

if NET_ARP_SEND || NET_ARP_SEND_QUEUE

config ARP_SEND_MAXTRIES
	int "ARP send retries"
	default 5
	---help---
		Send the ARP request this number of times before giving up and
		deciding that the target IP address is non reachable.

config ARP_SEND_DELAYMSEC
	int "ARP re-send delay"
	default 20
	---help---
		Wait this number of milliseconds after sending the ARP request
		before checking if the IP address mapping is present in the ARP
		table.  This time should be related to the maximum round trip time
		on the network since it is basically the time from when an ARP
		request is sent until the response is received.

config NET_ARP_PREALLOC_STATES
	int "Preallocated ARP send states"
	default 2
	---help---
		Number of ARP send states (all tasks).

		This number of connections will be pre-allocated during system boot.
		If dynamic connections allocation is enabled, more connections may
		be allocated at a later time, as the system needs them. Else this
		will be the maximum number of connections available to the system
		at all times.

		Set to 0 to disable (and rely only on dynamic allocations).

config NET_ARP_ALLOC_STATES
	int "Dynamic ARP send states allocation"
	default 1
	---help---
		Dynamic memory allocations for ARP send states.

		When set to 0 all dynamic allocations are disabled.

		When set to 1 a new connection will be allocated every time,
		and it will be free'd when no longer needed.

		Setting this to 2 or more will allocate the connections in
		batches (with batch size equal to this config). When a
		connection is no longer needed, it will be returned to the
		free connections pool, and it will never be deallocated!

config NET_ARP_MAX_STATES
	int "Maximum number of ARP/IP connections"
	default 0
	depends on NET_ARP_ALLOC_STATES > 0
	---help---
		If dynamic connections allocation is selected (NET_ARP_ALLOC_STATES > 0)
		this will limit the number of connections that can be allocated.

		This is useful in case the system is under very heavy load (or
		under attack), ensuring that the heap will not be exhausted.

endif # NET_ARP_SEND

config NET_ARP_DUMP
	bool "Dump ARP packet header"
	default n
	depends on DEBUG_NET_INFO
	---help---
		Dump ARP packets to the SYSLOG device.

config NET_ARP_ACD
	bool "Support of ARP address Address Conflict Detection"
	default n
	depends on NET_ARP_SEND
	---help---
		Enable Support of ARP address Address Conflict Detection

endif # NET_ARP
endmenu # ARP Configuration