zephyr/subsys/net/ip/Kconfig

# IP stack config

# Copyright (c) 2016 Intel Corporation.
# Copyright (c) 2021 Nordic Semiconductor
# Copyright (c) 2023 Arm Limited (or its affiliates). All rights reserved.
# SPDX-License-Identifier: Apache-2.0

menu "IP stack"

# Hidden option enabled whenever an IP stack is available.
config NET_IP
	bool
	default y if NET_IPV6 || NET_IPV4

# Hidden option selected by net connection based socket implementations
# to draw in all code required for connection infrastructure.
config NET_CONNECTION_SOCKETS
	bool

config NET_NATIVE
	bool "Native network stack support"
	default y
	help
	  Enables Zephyr native IP stack. If you disable this, then
	  you need to enable the offloading support if you want to
	  have IP connectivity.

# Hidden options for enabling native IPv6/IPv4. Using these options
# avoids having "defined(CONFIG_NET_IPV6) && defined(CONFIG_NET_NATIVE)"
# in the code as we can have "defined(CONFIG_NET_NATIVE_IPV6)" instead.
config NET_NATIVE_IPV6
	bool
	depends on NET_NATIVE
	default y if NET_IPV6

config NET_NATIVE_IPV4
	bool
	depends on NET_NATIVE
	default y if NET_IPV4

config NET_NATIVE_TCP
	bool
	depends on NET_NATIVE
	default y if NET_TCP

config NET_NATIVE_UDP
	bool
	depends on NET_NATIVE
	default y if NET_UDP

config NET_OFFLOAD
	bool "Offload IP stack"
	help
	  Enables TCP/IP stack to be offload to a co-processor.

if NET_OFFLOAD
module = NET_OFFLOAD
module-dep = NET_LOG
module-str = Log level for offload layer
module-help = Enables offload layer to output debug messages.
source "subsys/net/Kconfig.template.log_config.net"
endif # NET_OFFLOAD

config NET_RAW_MODE
	bool
	help
	  This is a very specific option used to built only the very minimal
	  part of the net stack in order to get network drivers working without
	  any net stack above: core, L2 etc... Basically this will build only
	  net_pkt part. It is currently used only by IEEE 802.15.4 drivers,
	  though any type of net drivers could use it.

if !NET_RAW_MODE

choice
	prompt "Qemu networking"
	default NET_QEMU_PPP if NET_PPP
	default NET_QEMU_SLIP
	depends on QEMU_TARGET
	help
	  Can be used to select how the network connectivity is established
	  from inside qemu to host system. This can be done either via
	  serial connection (SLIP) or via Qemu ethernet driver.

config NET_QEMU_SLIP
	bool "SLIP"
	help
	  Connect to host or to another Qemu via SLIP.

config NET_QEMU_PPP
	bool "PPP"
	help
	  Connect to host via PPP.

config NET_QEMU_ETHERNET
	bool "Ethernet"
	help
	  Connect to host system via Qemu ethernet driver support. One such
	  driver that Zephyr supports is Intel e1000 ethernet driver.

config NET_QEMU_USER
	bool "SLIRP"
	help
	  Connect to host system via Qemu's built-in User Networking support. This
	  is implemented using "slirp", which provides a full TCP/IP stack within
	  QEMU and uses that stack to implement a virtual NAT'd network.

endchoice

config NET_QEMU_USER_EXTRA_ARGS
	string "Qemu User Networking Args"
	depends on NET_QEMU_USER
	default ""
	help
	  Extra arguments passed to QEMU when User Networking is enabled. This may
	  include host / guest port forwarding, device id, Network address
	  information etc. This string is appended to the QEMU "-net user" option.

config NET_INIT_PRIO
	int
	default 90
	help
	  Network initialization priority level. This number tells how
	  early in the boot the network stack is initialized.

config NET_IP_DSCP_ECN
	bool "DSCP/ECN processing at IP layer"
	depends on NET_IP
	default y
	help
	  Specify whether DSCP/ECN values are processed at IP layer. The values
	  are encoded within ToS field in IPv4 and TC field in IPv6.

source "subsys/net/ip/Kconfig.ipv6"

source "subsys/net/ip/Kconfig.ipv4"

config NET_SHELL
	bool "Network shell utilities"
	select SHELL
	help
	  Activate shell module that provides network commands like
	  ping to the console.

config NET_SHELL_DYN_CMD_COMPLETION
	bool "Network shell dynamic command completion"
	depends on NET_SHELL
	default y
	help
	  Enable various net-shell command to support dynamic command
	  completion. This means that for example the nbr command can
	  automatically complete the neighboring IPv6 address and user
	  does not need to type it manually.
	  Please note that this uses more memory in order to save the
	  dynamic command strings. For example for nbr command the
	  increase is 320 bytes (8 neighbors * 40 bytes for IPv6 address
	  length) by default. Other dynamic completion commands in
	  net-shell require also some smaller amount of memory.

config NET_TC_TX_COUNT
	int "How many Tx traffic classes to have for each network device"
	default 1 if USERSPACE || USB_DEVICE_NETWORK
	default 0
	range 1 NET_TC_NUM_PRIORITIES if NET_TC_NUM_PRIORITIES<=8 && USERSPACE
	range 0 NET_TC_NUM_PRIORITIES if NET_TC_NUM_PRIORITIES<=8
	range 1 8 if USERSPACE
	range 0 8
	help
	  Define how many Tx traffic classes (queues) the system should have
	  when sending a network packet. The network packet priority can then
	  be mapped to this traffic class so that higher prioritized packets
	  can be processed before lower prioritized ones. Each queue is handled
	  by a separate thread which will need RAM for stack space.
	  Only increase the value from 1 if you really need this feature.
	  The default value is 1 which means that all the network traffic is
	  handled equally. In this implementation, the higher traffic class
	  value corresponds to lower thread priority.
	  If you select 0 here, then it means that all the network traffic
	  is pushed to the driver directly without any queues.
	  Note that if USERSPACE support is enabled, then currently we need to
	  enable at least 1 TX thread.

config NET_TC_RX_COUNT
	int "How many Rx traffic classes to have for each network device"
	default 1
	range 1 NET_TC_NUM_PRIORITIES if NET_TC_NUM_PRIORITIES<=8 && USERSPACE
	range 0 NET_TC_NUM_PRIORITIES if NET_TC_NUM_PRIORITIES<=8
	range 1 8 if USERSPACE
	range 0 8
	help
	  Define how many Rx traffic classes (queues) the system should have
	  when receiving a network packet. The network packet priority can then
	  be mapped to this traffic class so that higher prioritized packets
	  can be processed before lower prioritized ones. Each queue is handled
	  by a separate thread which will need RAM for stack space.
	  Only increase the value from 1 if you really need this feature.
	  The default value is 1 which means that all the network traffic is
	  handled equally. In this implementation, the higher traffic class
	  value corresponds to lower thread priority.
	  If you select 0 here, then it means that all the network traffic
	  is pushed from the driver to application thread without any
	  intermediate RX queue. There is always a receive socket queue between
	  device driver and application. Disabling RX thread means that the
	  network device driver, that is typically running in IRQ context, will
	  handle the packet all the way to the application. This might cause
	  other incoming packets to be lost if the RX processing takes long
	  time.
	  Note that if USERSPACE support is enabled, then currently we need to
	  enable at least 1 RX thread.

config NET_TC_SKIP_FOR_HIGH_PRIO
	bool "Push high priority packets directly to network driver"
	help
	  If this is set, then high priority (NET_PRIORITY_CA) net_pkt will be
	  pushed directly to network driver and will skip the traffic class
	  queues. This is currently not enabled by default.

choice NET_TC_THREAD_TYPE
	prompt "How the network RX/TX threads should work"
	help
	  Please select the RX/TX threads to be either pre-emptive or
	  co-operative.

config NET_TC_THREAD_COOPERATIVE
	bool "Use co-operative TX/RX threads"
	depends on COOP_ENABLED
	help
	  With co-operative threads, the thread cannot be pre-empted.

config NET_TC_THREAD_PREEMPTIVE
	bool "Use pre-emptive TX/RX threads [EXPERIMENTAL]"
	depends on PREEMPT_ENABLED
	select EXPERIMENTAL
	help
	  With pre-emptive threads, the thread can be pre-empted.

endchoice

config NET_TC_NUM_PRIORITIES
	int
	default NUM_COOP_PRIORITIES if NET_TC_THREAD_COOPERATIVE
	default NUM_PREEMPT_PRIORITIES if NET_TC_THREAD_PREEMPTIVE

choice
	prompt "Priority to traffic class mapping"
	help
	  Select mapping to use to map network packet priorities to traffic
	  classes.

config NET_TC_MAPPING_STRICT
	bool "Strict priority mapping"
	help
	  This is the recommended default priority to traffic class mapping.
	  Use it for implementations that do not support the credit-based
	  shaper transmission selection algorithm.
	  See 802.1Q, chapter 8.6.6 for more information.

config NET_TC_MAPPING_SR_CLASS_A_AND_B
	bool "SR class A and class B mapping"
	depends on NET_TC_TX_COUNT >= 2
	depends on NET_TC_RX_COUNT >= 2
	help
	  This is the recommended priority to traffic class mapping for a
	  system that supports SR (Stream Reservation) class A and SR class B.
	  See 802.1Q, chapter 34.5 for more information.

config NET_TC_MAPPING_SR_CLASS_B_ONLY
	bool "SR class B only mapping"
	depends on NET_TC_TX_COUNT >= 2
	depends on NET_TC_RX_COUNT >= 2
	help
	  This is the recommended priority to traffic class mapping for a
	  system that supports SR (Stream Reservation) class B only.
	  See 802.1Q, chapter 34.5 for more information.
endchoice

config NET_TX_DEFAULT_PRIORITY
	int "Default network TX packet priority if none have been set"
	default 1
	range 0 7
	help
	  What is the default network packet priority if user has not specified
	  one. The value 0 means lowest priority and 7 is the highest.

config NET_RX_DEFAULT_PRIORITY
	int "Default network RX packet priority if none have been set"
	default 0
	range 0 7
	help
	  What is the default network RX packet priority if user has not set
	  one. The value 0 means lowest priority and 7 is the highest.

config NET_IP_ADDR_CHECK
	bool "Check IP address validity before sending IP packet"
	default y
	help
	  Check that either the source or destination address is
	  correct before sending either IPv4 or IPv6 network packet.

config NET_MAX_ROUTERS
	int "How many routers are supported"
	default 2 if NET_IPV4 && NET_IPV6
	default 1 if NET_IPV4 && !NET_IPV6
	default 1 if !NET_IPV4 && NET_IPV6
	range 1 254
	help
	  The value depends on your network needs.

# Normally the route support is enabled by RPL or similar technology
# that needs to use the routing infrastructure.
config NET_ROUTE
	bool
	depends on NET_IPV6_NBR_CACHE
	default y if NET_IPV6_NBR_CACHE

# Temporarily hide the routing option as we do not have RPL in the system
# that used to populate the routing table.
config NET_ROUTING
	bool
	depends on NET_ROUTE
	help
	  Allow IPv6 routing between different network interfaces and
	  technologies. Currently this has limited use as some entity
	  would need to populate the routing table. RPL used to do that
	  earlier but currently there is no RPL support in Zephyr.

config NET_MAX_ROUTES
	int "Max number of routing entries stored."
	default NET_IPV6_MAX_NEIGHBORS
	depends on NET_ROUTE
	help
	  This determines how many entries can be stored in routing table.

config NET_MAX_NEXTHOPS
	int "Max number of next hop entries stored."
	default NET_MAX_ROUTES
	depends on NET_ROUTE
	help
	  This determines how many entries can be stored in nexthop table.

config NET_ROUTE_MCAST
	bool "Multicast Routing / Forwarding"
	depends on NET_ROUTE
	help
	  Activates multicast routing/forwarding

config NET_MAX_MCAST_ROUTES
	int "Max number of multicast routing entries stored."
	default 1
	depends on NET_ROUTE_MCAST
	help
	  This determines how many entries can be stored in multicast
	  routing table.

config NET_TCP
	bool "TCP"
	depends on NET_IP
	help
	  The value depends on your network needs.

config NET_TCP_CHECKSUM
	bool "Check TCP checksum"
	default y
	depends on NET_TCP
	help
	  Enables TCP handler to check TCP checksum. If the checksum is invalid,
	  then the packet is discarded.

if NET_TCP
module = NET_TCP
module-dep = NET_LOG
module-str = Log level for TCP
module-help = Enables TCP handler output debug messages
source "subsys/net/Kconfig.template.log_config.net"
endif # NET_TCP

config NET_TCP_TIME_WAIT_DELAY
	int "How long to wait in TIME_WAIT state (in milliseconds)"
	depends on NET_TCP
	default 1500
	help
	  To avoid a (low-probability) issue when delayed packets from
	  previous connection get delivered to next connection reusing
	  the same local/remote ports, RFC 793 (TCP) suggests to keep
	  an old, closed connection in a special "TIME_WAIT" state for
	  the duration of 2*MSL (Maximum Segment Lifetime). The RFC
	  suggests to use MSL of 2 minutes, but notes "This is an
	  engineering choice, and may be changed if experience indicates
	  it is desirable to do so." For low-resource systems, having
	  large MSL may lead to quick resource exhaustion (and related
	  DoS attacks). At the same time, the issue of packet misdelivery
	  is largely alleviated in the modern TCP stacks by using random,
	  non-repeating port numbers and initial sequence numbers. Due
	  to this, Zephyr uses much lower value of 1500ms by default.
	  Value of 0 disables TIME_WAIT state completely.

config NET_TCP_ACK_TIMEOUT
	int "How long to wait for ACK (in milliseconds)"
	depends on NET_TCP
	default 1000
	range 1 2147483647
	help
	  This value affects the timeout when waiting ACK to arrive in
	  various TCP states. The value is in milliseconds. Note that
	  having a very low value here could prevent connectivity.

config NET_TCP_INIT_RETRANSMISSION_TIMEOUT
	int "Initial value of Retransmission Timeout (RTO) (in milliseconds)"
	depends on NET_TCP
	default 200
	range 100 60000
	help
	  This value affects the timeout between initial retransmission
	  of TCP data packets. The value is in milliseconds.

config NET_TCP_RETRY_COUNT
	int "Maximum number of TCP segment retransmissions"
	depends on NET_TCP
	default 9
	help
	  The following formula can be used to determine the time (in ms)
	  that a segment will be be buffered awaiting retransmission:
	  n=NET_TCP_RETRY_COUNT
	  Sum((1<<n) * NET_TCP_INIT_RETRANSMISSION_TIMEOUT)
	  n=0
	  With the default value of 9, the IP stack will try to
	  retransmit for up to 1:42 minutes.  This is as close as possible
	  to the minimum value recommended by RFC1122 (1:40 minutes).
	  Only 5 bits are dedicated for the retransmission count, so accepted
	  values are in the 0-31 range.  It's highly recommended to not go
	  below 9, though.
	  Should a retransmission timeout occur, the receive callback is
	  called with -ECONNRESET error code and the context is dereferenced.

config NET_TCP_RANDOMIZED_RTO
	bool "Use a randomized retransmission time"
	default y
	depends on NET_TCP
	help
	  It can happen that two similar stacks enter a retransmission cycle
	  due to a packet collision. If the transmission timeout is the same
	  both stacks will retry at the same moment resulting in another
	  collision. By introducing a randomized retry timeout, the chance of
	  a second collision is reduced and it reduces furter the more
	  retransmissions occur.

config NET_TCP_FAST_RETRANSMIT
	bool "Fast-retry algorithm based on the number of duplicated ACKs"
	depends on NET_TCP
	default y
	help
	  When a packet is lost, the receiver will keep acknowledging the
	  sequence number of the last correctly received byte. Upon reception
	  of a sequence of acknowledgements for the same sequence number,
	  this can be deduced as that the packet afterwards must have been lost.
	  In that case a retransmission is triggerd to avoid having to wait for
	  the retransmit timer to elapse.

config NET_TCP_MAX_SEND_WINDOW_SIZE
	int "Maximum sending window size to use"
	depends on NET_TCP
	default 0
	range 0 65535
	help
	  This value affects how the TCP selects the maximum sending window
	  size. The default value 0 lets the TCP stack select the value
	  according to amount of network buffers configured in the system.

config NET_TCP_MAX_RECV_WINDOW_SIZE
	int "Maximum receive window size to use"
	depends on NET_TCP
	default 0
	range 0 65535
	help
	  This value defines the maximum TCP receive window size. Increasing
	  this value can improve connection throughput, but requires more
	  receive buffers available in the system for efficient operation.
	  The default value 0 lets the TCP stack select the value
	  according to amount of network buffers configured in the system.

config NET_TCP_RECV_QUEUE_TIMEOUT
	int "How long to queue received data (in ms)"
	depends on NET_TCP
	default 2000
	range 0 10000
	help
	  If we receive out-of-order TCP data, we queue it. This value tells
	  how long the data is kept before it is discarded if we have not been
	  able to pass the data to the application. If set to 0, then receive
	  queueing is not enabled. The value is in milliseconds.
	  Note that we only queue data sequentially in current version i.e.,
	  there should be no holes in the queue. For example, if we receive
	  SEQs 5,4,3,6 and are waiting SEQ 2, the data in segments 3,4,5,6 is
	  queued (in this order), and then given to application when we receive
	  SEQ 2. But if we receive SEQs 5,4,3,7 then the SEQ 7 is discarded
	  because the list would not be sequential as number 6 is be missing.

config NET_TCP_PKT_ALLOC_TIMEOUT
	int "How long to wait for a TCP packet allocation (in ms)"
	depends on NET_TCP
	default 100
	range 10 1000
	help
	  The TCP network stack allocates packets from the buffers and the
	  allocation can take some time depending on the situation.
	  This value indicates how long the stack should wait for the packet to
	  be allocated, before returning an internal error and trying again.

config NET_TCP_WORKQ_STACK_SIZE
	int "TCP work queue thread stack size"
	default 1024
	depends on NET_TCP
	help
	  Set the TCP work queue thread stack size in bytes.

config NET_TCP_ISN_RFC6528
	bool "Use ISN algorithm from RFC 6528"
	default y
	depends on NET_TCP
	select MBEDTLS
	select MBEDTLS_MD
	select MBEDTLS_MAC_MD5_ENABLED
	help
	  Implement Initial Sequence Number calculation as described in
	  RFC 6528 chapter 3. https://tools.ietf.org/html/rfc6528
	  If this is not set, then sys_rand32_get() is used for ISN value.

config NET_TEST_PROTOCOL
	bool "JSON based test protocol (UDP)"
	help
	  Enable JSON based test protocol (UDP).

config NET_UDP
	bool "UDP"
	default y
	depends on NET_IP
	help
	  The value depends on your network needs.

config NET_UDP_CHECKSUM
	bool "Check UDP checksum"
	default y
	depends on NET_UDP
	help
	  Enables UDP handler to check UDP checksum. If the checksum is invalid,
	  then the packet is discarded.

config NET_UDP_MISSING_CHECKSUM
	bool "Accept missing checksum (IPv4 only)"
	depends on NET_UDP && NET_IPV4
	help
	  RFC 768 states the possibility to have a missing checksum, for
	  debugging purposes for instance. That feature is however valid only
	  for IPv4 and on reception only, since Zephyr will always compute the
	  UDP checksum in transmission path.

if NET_UDP
module = NET_UDP
module-dep = NET_LOG
module-str = Log level for UDP
module-help = Enables UDP handler output debug messages
source "subsys/net/Kconfig.template.log_config.net"
endif # NET_UDP

config NET_MAX_CONN
	int "How many network connections are supported"
	depends on NET_UDP || NET_TCP || NET_SOCKETS_PACKET || NET_SOCKETS_CAN
	default 8 if NET_IPV6 && NET_IPV4
	default 4
	help
	  The value depends on your network needs. The value
	  should include both UDP and TCP connections.

config NET_MAX_CONTEXTS
	int "Number of network contexts to allocate"
	default 6
	help
	  Each network context is used to describe a network 5-tuple that
	  is used when listening or sending network traffic. This is very
	  similar as one could call a network socket in some other systems.

config NET_CONTEXT_NET_PKT_POOL
	bool "Net_buf TX pool / context"
	default y if NET_TCP && NET_6LO
	help
	  If enabled, then it is possible to fine-tune network packet pool
	  for each context when sending network data. If this setting is
	  enabled, then you should define the context pools in your application
	  using NET_PKT_TX_POOL_DEFINE() and NET_PKT_DATA_POOL_DEFINE()
	  macros and tie these pools to desired context using the
	  net_context_setup_pools() function.

config NET_CONTEXT_SYNC_RECV
	bool "Support synchronous functionality in net_context_recv() API"
	default y
	help
	  You can disable sync support to save some memory if you are calling
	  net_context_recv() in async way only when timeout is set to 0.

config NET_CONTEXT_CHECK
	bool "Check options when calling various net_context functions"
	default y
	help
	  If you know that the options passed to net_context...() functions
	  are ok, then you can disable the checks to save some memory.

config NET_CONTEXT_PRIORITY
	bool "Add priority support to net_context"
	help
	  It is possible to prioritize network traffic. This requires
	  also traffic class support to work as expected.

config NET_CONTEXT_TXTIME
	bool "Add TXTIME support to net_context"
	select NET_PKT_TXTIME
	help
	  It is possible to add information when the outgoing network packet
	  should be sent. The TX time information should be placed into
	  ancillary data field in sendmsg call.

config NET_CONTEXT_RCVTIMEO
	bool "Add RCVTIMEO support to net_context"
	help
	  It is possible to time out receiving a network packet. The timeout
	  time is configurable run-time in the application code. For network
	  sockets timeout is configured per socket with
	  setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, ...) function.

config NET_CONTEXT_SNDTIMEO
	bool "Add SNDTIMEO support to net_context"
	help
	  It is possible to time out sending a network packet. The timeout
	  time is configurable run-time in the application code. For network
	  sockets timeout is configured per socket with
	  setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, ...) function.

config NET_CONTEXT_RCVBUF
	bool "Add RCVBUF support to net_context"
	help
	  If is possible to define the maximum socket receive buffer per socket.
	  The default value is set by CONFIG_NET_TCP_MAX_RECV_WINDOW_SIZE. For
	  TCP sockets, the rcvbuf will determine the receive window size.

config NET_CONTEXT_SNDBUF
	bool "Add SNDBUF support to net_context"
	help
	  It is possible to define the maximum socket send buffer per socket.
	  For TCP sockets, the sndbuf will determine the total size of queued
	  data in the TCP layer.

config NET_CONTEXT_DSCP_ECN
	bool "Add support for setting DSCP/ECN IP properties on net_context"
	depends on NET_IP_DSCP_ECN
	default y
	help
	  Allow to set Differentiated Services and Explicit Congestion
	  Notification values on net_context. Those values are then used in
	  IPv4/IPv6 header when sending packets over net_context.

config NET_TEST
	bool "Network Testing"
	help
	  Used for self-contained networking tests that do not require a
	  network device.

config NET_SLIP_TAP
	bool "TAP SLIP driver"
	depends on NET_QEMU_SLIP
	depends on NET_NATIVE
	select SLIP
	select UART_PIPE
	select UART_INTERRUPT_DRIVEN
	select SLIP_TAP
	default y if (QEMU_TARGET && !NET_TEST && !NET_L2_BT)
	help
	  SLIP TAP support is necessary when testing with QEMU. The host
	  needs to have tunslip6 with TAP support running in order to
	  communicate via the SLIP driver. See net-tools project at
	  https://github.com/zephyrproject-rtos/net-tools for more details.

config NET_TRICKLE
	bool "Trickle library"
	help
	  Normally this is enabled automatically if needed,
	  so say 'n' if unsure.

if NET_TRICKLE
module = NET_TRICKLE
module-dep = NET_LOG
module-str = Log level for Trickle algorithm
module-help = Enables Trickle library output debug messages
source "subsys/net/Kconfig.template.log_config.net"
endif # NET_TRICKLE

endif # NET_RAW_MODE

config NET_PKT_RX_COUNT
	int "How many packet receives can be pending at the same time"
	default 14 if NET_L2_ETHERNET
	default 4
	help
	  Each RX buffer will occupy smallish amount of memory.
	  See include/net/net_pkt.h and the sizeof(struct net_pkt)

config NET_PKT_TX_COUNT
	int "How many packet sends can be pending at the same time"
	default 14 if NET_L2_ETHERNET
	default 4
	help
	  Each TX buffer will occupy smallish amount of memory.
	  See include/net/net_pkt.h and the sizeof(struct net_pkt)

config NET_BUF_RX_COUNT
	int "How many network buffers are allocated for receiving data"
	default 36 if NET_L2_ETHERNET
	default 16
	help
	  Each data buffer will occupy CONFIG_NET_BUF_DATA_SIZE + smallish
	  header (sizeof(struct net_buf)) amount of data.

config NET_BUF_TX_COUNT
	int "How many network buffers are allocated for sending data"
	default 36 if NET_L2_ETHERNET
	default 16
	help
	  Each data buffer will occupy CONFIG_NET_BUF_DATA_SIZE + smallish
	  header (sizeof(struct net_buf)) amount of data.

choice
	prompt "Network packet data allocator type"
	default NET_BUF_FIXED_DATA_SIZE
	help
	  Select the memory allocator for the network buffers that hold the
	  packet data.

config NET_BUF_FIXED_DATA_SIZE
	bool "Fixed data size buffer"
	help
	  Each buffer comes with a built time configured size. If runtime
	  requested is bigger than that, it will allocate as many net_buf
	  as necessary to reach that request.

config NET_BUF_VARIABLE_DATA_SIZE
	bool "Variable data size buffer [EXPERIMENTAL]"
	select EXPERIMENTAL
	help
	  The buffer is dynamically allocated from runtime requested size.

endchoice

config NET_BUF_DATA_SIZE
	int "Size of each network data fragment"
	default 128
	depends on NET_BUF_FIXED_DATA_SIZE
	help
	  This value tells what is the fixed size of each network buffer.

config NET_BUF_DATA_POOL_SIZE
	int "Size of the memory pool where buffers are allocated from"
	default 4096 if NET_L2_ETHERNET
	default 2048
	depends on NET_BUF_VARIABLE_DATA_SIZE
	help
	  This value tell what is the size of the memory pool where each
	  network buffer is allocated from.

config NET_PKT_BUF_USER_DATA_SIZE
	int "Size of user_data available in rx and tx network buffers"
	default BT_CONN_TX_USER_DATA_SIZE if NET_L2_BT
	default 4
	range BT_CONN_TX_USER_DATA_SIZE 16 if NET_L2_BT
	range 4 16
	help
	  User data size used in rx and tx network buffers.

config NET_HEADERS_ALWAYS_CONTIGUOUS
	bool
	help
	  This a hidden option, which one should use with a lot of care.
	  NO bug reports will be accepted if that option is enabled!
	  You are warned.
	  If you are 100% sure the headers memory space is always in a
	  contiguous space, this will save stack usage and ROM in net core.
	  This is a possible case when using IPv4 only, with
	  NET_BUF_FIXED_DATA_SIZE enabled and NET_BUF_DATA_SIZE of 128 for
	  instance.

choice
	prompt "Default Network Interface"
	default NET_DEFAULT_IF_FIRST
	help
	  If system has multiple interfaces enabled, then user shall be able
	  to choose default interface. Otherwise first interface will be the
	  default interface.

config NET_DEFAULT_IF_FIRST
	bool "First available interface"

config NET_DEFAULT_IF_UP
	bool "First interface which is up"

config NET_DEFAULT_IF_ETHERNET
	bool "Ethernet"
	depends on NET_L2_ETHERNET

config NET_DEFAULT_IF_BLUETOOTH
	bool "Bluetooth"
	depends on NET_L2_BT

config NET_DEFAULT_IF_IEEE802154
	bool "IEEE 802.15.4"
	depends on NET_L2_IEEE802154

config NET_DEFAULT_IF_OFFLOAD
	bool "Offloaded interface"
	depends on NET_OFFLOAD

config NET_DEFAULT_IF_DUMMY
	bool "Dummy testing interface"
	depends on NET_L2_DUMMY

config NET_DEFAULT_IF_CANBUS_RAW
	bool "Socket CAN interface"
	depends on NET_L2_CANBUS_RAW

config NET_DEFAULT_IF_PPP
	bool "PPP interface"
	depends on NET_L2_PPP

endchoice

config NET_PKT_TIMESTAMP
	bool "Network packet timestamp support"
	help
	  Enable network packet timestamp support. This is needed for
	  example in gPTP which needs to know how long it takes to send
	  a network packet.

config NET_PKT_TIMESTAMP_THREAD
	bool "Create TX timestamp thread"
	default y if NET_L2_PTP
	depends on NET_PKT_TIMESTAMP
	help
	  Create a TX timestamp thread that will pass the timestamped network
	  packets to some other module like gPTP for further processing.
	  If you just want to timestamp network packets and get information
	  how long the network packets flow in the system, you can disable
	  the thread support.

config NET_PKT_TIMESTAMP_STACK_SIZE
	int "Timestamp thread stack size"
	default 1024
	depends on NET_PKT_TIMESTAMP_THREAD
	help
	  Set the timestamp thread stack size in bytes. The timestamp
	  thread waits for timestamped TX frames and calls registered
	  callbacks.

config NET_PKT_TXTIME
	bool "Network packet TX time support"
	help
	  Enable network packet TX time support. This is needed for
	  when the application wants to set the exact time when the network
	  packet should be sent.

config NET_PKT_RXTIME_STATS
	bool "Network packet RX time statistics"
	select NET_PKT_TIMESTAMP
	select NET_STATISTICS
	depends on (NET_UDP || NET_TCP || NET_SOCKETS_PACKET) && NET_NATIVE
	help
	  Enable network packet RX time statistics support. This is used to
	  calculate how long on average it takes for a packet to travel from
	  device driver to just before it is given to application. The RX
	  timing information can then be seen in network interface statistics
	  in net-shell.
	  The RX statistics are only calculated for UDP and TCP packets.

config NET_PKT_RXTIME_STATS_DETAIL
	bool "Get extra receive detail statistics in RX path"
	depends on NET_PKT_RXTIME_STATS
	help
	  Store receive statistics detail information in certain key points
	  in RX path. This is very special configuration and will increase
	  the size of net_pkt so in typical cases you should not enable it.
	  The extra statistics can be seen in net-shell using "net stats"
	  command.

config NET_PKT_TXTIME_STATS
	bool "Network packet TX time statistics"
	select NET_PKT_TIMESTAMP
	select NET_STATISTICS
	depends on (NET_UDP || NET_TCP || NET_SOCKETS_PACKET) && NET_NATIVE
	help
	  Enable network packet TX time statistics support. This is used to
	  calculate how long on average it takes for a packet to travel from
	  application to just before it is sent to network. The TX timing
	  information can then be seen in network interface statistics in
	  net-shell.
	  The RX calculation is done only for UDP, TCP or RAW packets,
	  but for TX we do not know the protocol so the TX packet timing is
	  done for all network protocol packets.

config NET_PKT_TXTIME_STATS_DETAIL
	bool "Get extra transmit detail statistics in TX path"
	depends on NET_PKT_TXTIME_STATS
	help
	  Store receive statistics detail information in certain key points
	  in TX path. This is very special configuration and will increase
	  the size of net_pkt so in typical cases you should not enable it.
	  The extra statistics can be seen in net-shell using "net stats"
	  command.

config NET_PROMISCUOUS_MODE
	bool "Promiscuous mode support"
	select NET_MGMT
	select NET_MGMT_EVENT
	select NET_L2_ETHERNET_MGMT if NET_L2_ETHERNET
	help
	  Enable promiscuous mode support. This only works if the network
	  device driver supports promiscuous mode. The user application
	  also needs to read the promiscuous mode data.

if NET_PROMISCUOUS_MODE
module = NET_PROMISC
module-dep = NET_LOG
module-str = Log level for promiscuous mode
module-help = Enables promiscuous mode to output debug messages.
source "subsys/net/Kconfig.template.log_config.net"
endif # NET_PROMISCUOUS_MODE

config NET_DISABLE_ICMP_DESTINATION_UNREACHABLE
	bool "Disable destination unreachable ICMP errors"
	help
	  Suppress the generation of ICMP destination unreachable errors
	  when ports that are not in a listening state receive packets.

source "subsys/net/ip/Kconfig.stack"

source "subsys/net/ip/Kconfig.mgmt"

source "subsys/net/ip/Kconfig.stats"

source "subsys/net/ip/Kconfig.debug"

endmenu