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linux/drivers/net/Kconfig
Daniel Borkmann 35dfaad718 netkit, bpf: Add bpf programmable net device 
This work adds a new, minimal BPF-programmable device called "netkit"
(former PoC code-name "meta") we recently presented at LSF/MM/BPF. The
core idea is that BPF programs are executed within the drivers xmit routine
and therefore e.g. in case of containers/Pods moving BPF processing closer
to the source.

One of the goals was that in case of Pod egress traffic, this allows to
move BPF programs from hostns tcx ingress into the device itself, providing
earlier drop or forward mechanisms, for example, if the BPF program
determines that the skb must be sent out of the node, then a redirect to
the physical device can take place directly without going through per-CPU
backlog queue. This helps to shift processing for such traffic from softirq
to process context, leading to better scheduling decisions/performance (see
measurements in the slides).

In this initial version, the netkit device ships as a pair, but we plan to
extend this further so it can also operate in single device mode. The pair
comes with a primary and a peer device. Only the primary device, typically
residing in hostns, can manage BPF programs for itself and its peer. The
peer device is designated for containers/Pods and cannot attach/detach
BPF programs. Upon the device creation, the user can set the default policy
to 'pass' or 'drop' for the case when no BPF program is attached.

Additionally, the device can be operated in L3 (default) or L2 mode. The
management of BPF programs is done via bpf_mprog, so that multi-attach is
supported right from the beginning with similar API and dependency controls
as tcx. For details on the latter see commit 053c8e1f23 ("bpf: Add generic
attach/detach/query API for multi-progs"). tc BPF compatibility is provided,
so that existing programs can be easily migrated.

Going forward, we plan to use netkit devices in Cilium as the main device
type for connecting Pods. They will be operated in L3 mode in order to
simplify a Pod's neighbor management and the peer will operate in default
drop mode, so that no traffic is leaving between the time when a Pod is
brought up by the CNI plugin and programs attached by the agent.
Additionally, the programs we attach via tcx on the physical devices are
using bpf_redirect_peer() for inbound traffic into netkit device, hence the
latter is also supporting the ndo_get_peer_dev callback. Similarly, we use
bpf_redirect_neigh() for the way out, pushing from netkit peer to phys device
directly. Also, BIG TCP is supported on netkit device. For the follow-up
work in single device mode, we plan to convert Cilium's cilium_host/_net
devices into a single one.

An extensive test suite for checking device operations and the BPF program
and link management API comes as BPF selftests in this series.

Co-developed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://github.com/borkmann/iproute2/tree/pr/netkit
Link: http://vger.kernel.org/bpfconf2023_material/tcx_meta_netdev_borkmann.pdf (24ff.)
Link: https://lore.kernel.org/r/20231024214904.29825-2-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2023-10-24 16:06:03 -07:00

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# SPDX-License-Identifier: GPL-2.0-only
#
# Network device configuration
#
menuconfig NETDEVICES
default y if UML
depends on NET
bool "Network device support"
help
You can say N here if you don't intend to connect your Linux box to
any other computer at all.
You'll have to say Y if your computer contains a network card that
you want to use under Linux. If you are going to run SLIP or PPP over
telephone line or null modem cable you need say Y here. Connecting
two machines with parallel ports using PLIP needs this, as well as
AX.25/KISS for sending Internet traffic over amateur radio links.
See also "The Linux Network Administrator's Guide" by Olaf Kirch and
Terry Dawson. Available at <http://www.tldp.org/guides.html>.
If unsure, say Y.
# All the following symbols are dependent on NETDEVICES - do not repeat
# that for each of the symbols.
if NETDEVICES
config MII
tristate
config NET_CORE
default y
bool "Network core driver support"
help
You can say N here if you do not intend to use any of the
networking core drivers (i.e. VLAN, bridging, bonding, etc.)
if NET_CORE
config BONDING
tristate "Bonding driver support"
depends on INET
depends on IPV6 || IPV6=n
depends on TLS || TLS_DEVICE=n
help
Say 'Y' or 'M' if you wish to be able to 'bond' multiple Ethernet
Channels together. This is called 'Etherchannel' by Cisco,
'Trunking' by Sun, 802.3ad by the IEEE, and 'Bonding' in Linux.
The driver supports multiple bonding modes to allow for both high
performance and high availability operation.
Refer to <file:Documentation/networking/bonding.rst> for more
information.
To compile this driver as a module, choose M here: the module
will be called bonding.
config DUMMY
tristate "Dummy net driver support"
help
This is essentially a bit-bucket device (i.e. traffic you send to
this device is consigned into oblivion) with a configurable IP
address. It is most commonly used in order to make your currently
inactive SLIP address seem like a real address for local programs.
If you use SLIP or PPP, you might want to say Y here. It won't
enlarge your kernel. What a deal. Read about it in the Network
Administrator's Guide, available from
<http://www.tldp.org/docs.html#guide>.
To compile this driver as a module, choose M here: the module
will be called dummy.
config WIREGUARD
tristate "WireGuard secure network tunnel"
depends on NET && INET
depends on IPV6 || !IPV6
depends on !KMSAN # KMSAN doesn't support the crypto configs below
select NET_UDP_TUNNEL
select DST_CACHE
select CRYPTO
select CRYPTO_LIB_CURVE25519
select CRYPTO_LIB_CHACHA20POLY1305
select CRYPTO_CHACHA20_X86_64 if X86 && 64BIT
select CRYPTO_POLY1305_X86_64 if X86 && 64BIT
select CRYPTO_BLAKE2S_X86 if X86 && 64BIT
select CRYPTO_CURVE25519_X86 if X86 && 64BIT
select CRYPTO_CHACHA20_NEON if ARM || (ARM64 && KERNEL_MODE_NEON)
select CRYPTO_POLY1305_NEON if ARM64 && KERNEL_MODE_NEON
select CRYPTO_POLY1305_ARM if ARM
select CRYPTO_BLAKE2S_ARM if ARM
select CRYPTO_CURVE25519_NEON if ARM && KERNEL_MODE_NEON
select CRYPTO_CHACHA_MIPS if CPU_MIPS32_R2
select CRYPTO_POLY1305_MIPS if MIPS
select CRYPTO_CHACHA_S390 if S390
help
WireGuard is a secure, fast, and easy to use replacement for IPSec
that uses modern cryptography and clever networking tricks. It's
designed to be fairly general purpose and abstract enough to fit most
use cases, while at the same time remaining extremely simple to
configure. See www.wireguard.com for more info.
It's safe to say Y or M here, as the driver is very lightweight and
is only in use when an administrator chooses to add an interface.
config WIREGUARD_DEBUG
bool "Debugging checks and verbose messages"
depends on WIREGUARD
help
This will write log messages for handshake and other events
that occur for a WireGuard interface. It will also perform some
extra validation checks and unit tests at various points. This is
only useful for debugging.
Say N here unless you know what you're doing.
config EQUALIZER
tristate "EQL (serial line load balancing) support"
help
If you have two serial connections to some other computer (this
usually requires two modems and two telephone lines) and you use
SLIP (the protocol for sending Internet traffic over telephone
lines) or PPP (a better SLIP) on them, you can make them behave like
one double speed connection using this driver. Naturally, this has
to be supported at the other end as well, either with a similar EQL
Linux driver or with a Livingston Portmaster 2e.
Say Y if you want this and read
<file:Documentation/networking/eql.rst>. You may also want to read
section 6.2 of the NET-3-HOWTO, available from
<http://www.tldp.org/docs.html#howto>.
To compile this driver as a module, choose M here: the module
will be called eql. If unsure, say N.
config NET_FC
bool "Fibre Channel driver support"
depends on SCSI && PCI
help
Fibre Channel is a high speed serial protocol mainly used to connect
large storage devices to the computer; it is compatible with and
intended to replace SCSI.
If you intend to use Fibre Channel, you need to have a Fibre channel
adaptor card in your computer; say Y here and to the driver for your
adaptor below. You also should have said Y to "SCSI support" and
"SCSI generic support".
config IFB
tristate "Intermediate Functional Block support"
depends on NET_ACT_MIRRED || NFT_FWD_NETDEV
select NET_REDIRECT
help
This is an intermediate driver that allows sharing of
resources.
To compile this driver as a module, choose M here: the module
will be called ifb. If you want to use more than one ifb
device at a time, you need to compile this driver as a module.
Instead of 'ifb', the devices will then be called 'ifb0',
'ifb1' etc.
Look at the iproute2 documentation directory for usage etc
source "drivers/net/team/Kconfig"
config MACVLAN
tristate "MAC-VLAN support"
help
This allows one to create virtual interfaces that map packets to
or from specific MAC addresses to a particular interface.
Macvlan devices can be added using the "ip" command from the
iproute2 package starting with the iproute2-2.6.23 release:
"ip link add link <real dev> [ address MAC ] [ NAME ] type macvlan"
To compile this driver as a module, choose M here: the module
will be called macvlan.
config MACVTAP
tristate "MAC-VLAN based tap driver"
depends on MACVLAN
depends on INET
select TAP
help
This adds a specialized tap character device driver that is based
on the MAC-VLAN network interface, called macvtap. A macvtap device
can be added in the same way as a macvlan device, using 'type
macvtap', and then be accessed through the tap user space interface.
To compile this driver as a module, choose M here: the module
will be called macvtap.
config IPVLAN_L3S
depends on NETFILTER
depends on IPVLAN
def_bool y
select NET_L3_MASTER_DEV
config IPVLAN
tristate "IP-VLAN support"
depends on INET
depends on IPV6 || !IPV6
help
This allows one to create virtual devices off of a main interface
and packets will be delivered based on the dest L3 (IPv6/IPv4 addr)
on packets. All interfaces (including the main interface) share L2
making it transparent to the connected L2 switch.
Ipvlan devices can be added using the "ip" command from the
iproute2 package starting with the iproute2-3.19 release:
"ip link add link <main-dev> [ NAME ] type ipvlan"
To compile this driver as a module, choose M here: the module
will be called ipvlan.
config IPVTAP
tristate "IP-VLAN based tap driver"
depends on IPVLAN
depends on INET
select TAP
help
This adds a specialized tap character device driver that is based
on the IP-VLAN network interface, called ipvtap. An ipvtap device
can be added in the same way as a ipvlan device, using 'type
ipvtap', and then be accessed through the tap user space interface.
To compile this driver as a module, choose M here: the module
will be called ipvtap.
config VXLAN
tristate "Virtual eXtensible Local Area Network (VXLAN)"
depends on INET
select NET_UDP_TUNNEL
select GRO_CELLS
help
This allows one to create vxlan virtual interfaces that provide
Layer 2 Networks over Layer 3 Networks. VXLAN is often used
to tunnel virtual network infrastructure in virtualized environments.
For more information see:
http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-02
To compile this driver as a module, choose M here: the module
will be called vxlan.
config GENEVE
tristate "Generic Network Virtualization Encapsulation"
depends on INET
depends on IPV6 || !IPV6
select NET_UDP_TUNNEL
select GRO_CELLS
help
This allows one to create geneve virtual interfaces that provide
Layer 2 Networks over Layer 3 Networks. GENEVE is often used
to tunnel virtual network infrastructure in virtualized environments.
For more information see:
http://tools.ietf.org/html/draft-gross-geneve-02
To compile this driver as a module, choose M here: the module
will be called geneve.
config BAREUDP
tristate "Bare UDP Encapsulation"
depends on INET
depends on IPV6 || !IPV6
select NET_UDP_TUNNEL
select GRO_CELLS
help
This adds a bare UDP tunnel module for tunnelling different
kinds of traffic like MPLS, IP, etc. inside a UDP tunnel.
To compile this driver as a module, choose M here: the module
will be called bareudp.
config GTP
tristate "GPRS Tunneling Protocol datapath (GTP-U)"
depends on INET
select NET_UDP_TUNNEL
help
This allows one to create gtp virtual interfaces that provide
the GPRS Tunneling Protocol datapath (GTP-U). This tunneling protocol
is used to prevent subscribers from accessing mobile carrier core
network infrastructure. This driver requires a userspace software that
implements the signaling protocol (GTP-C) to update its PDP context
base, such as OpenGGSN <http://git.osmocom.org/openggsn/). This
tunneling protocol is implemented according to the GSM TS 09.60 and
3GPP TS 29.060 standards.
To compile this drivers as a module, choose M here: the module
will be called gtp.
config AMT
tristate "Automatic Multicast Tunneling (AMT)"
depends on INET && IP_MULTICAST
depends on IPV6 || !IPV6
select NET_UDP_TUNNEL
help
This allows one to create AMT(Automatic Multicast Tunneling)
virtual interfaces that provide multicast tunneling.
There are two roles, Gateway, and Relay.
Gateway Encapsulates IGMP/MLD traffic from listeners to the Relay.
Gateway Decapsulates multicast traffic from the Relay to Listeners.
Relay Encapsulates multicast traffic from Sources to Gateway.
Relay Decapsulates IGMP/MLD traffic from Gateway.
To compile this drivers as a module, choose M here: the module
will be called amt.
config MACSEC
tristate "IEEE 802.1AE MAC-level encryption (MACsec)"
select CRYPTO
select CRYPTO_AES
select CRYPTO_GCM
select GRO_CELLS
help
MACsec is an encryption standard for Ethernet.
config NETCONSOLE
tristate "Network console logging support"
help
If you want to log kernel messages over the network, enable this.
See <file:Documentation/networking/netconsole.rst> for details.
config NETCONSOLE_DYNAMIC
bool "Dynamic reconfiguration of logging targets"
depends on NETCONSOLE && SYSFS && CONFIGFS_FS && \
!(NETCONSOLE=y && CONFIGFS_FS=m)
help
This option enables the ability to dynamically reconfigure target
parameters (interface, IP addresses, port numbers, MAC addresses)
at runtime through a userspace interface exported using configfs.
See <file:Documentation/networking/netconsole.rst> for details.
config NETCONSOLE_EXTENDED_LOG
bool "Set kernel extended message by default"
depends on NETCONSOLE
default n
help
Set extended log support for netconsole message. If this option is
set, log messages are transmitted with extended metadata header in a
format similar to /dev/kmsg. See
<file:Documentation/networking/netconsole.rst> for details.
config NETCONSOLE_PREPEND_RELEASE
bool "Prepend kernel release version in the message by default"
depends on NETCONSOLE_EXTENDED_LOG
default n
help
Set kernel release to be prepended to each netconsole message by
default. If this option is set, the kernel release is prepended into
the first field of every netconsole message, so, the netconsole
server/peer can easily identify what kernel release is logging each
message. See <file:Documentation/networking/netconsole.rst> for
details.
config NETPOLL
def_bool NETCONSOLE
config NET_POLL_CONTROLLER
def_bool NETPOLL
config NTB_NETDEV
tristate "Virtual Ethernet over NTB Transport"
depends on NTB_TRANSPORT
config RIONET
tristate "RapidIO Ethernet over messaging driver support"
depends on RAPIDIO
config RIONET_TX_SIZE
int "Number of outbound queue entries"
depends on RIONET
default "128"
config RIONET_RX_SIZE
int "Number of inbound queue entries"
depends on RIONET
default "128"
config TUN
tristate "Universal TUN/TAP device driver support"
depends on INET
select CRC32
help
TUN/TAP provides packet reception and transmission for user space
programs. It can be viewed as a simple Point-to-Point or Ethernet
device, which instead of receiving packets from a physical media,
receives them from user space program and instead of sending packets
via physical media writes them to the user space program.
When a program opens /dev/net/tun, driver creates and registers
corresponding net device tunX or tapX. After a program closed above
devices, driver will automatically delete tunXX or tapXX device and
all routes corresponding to it.
Please read <file:Documentation/networking/tuntap.rst> for more
information.
To compile this driver as a module, choose M here: the module
will be called tun.
If you don't know what to use this for, you don't need it.
config TAP
tristate
help
This option is selected by any driver implementing tap user space
interface for a virtual interface to re-use core tap functionality.
config TUN_VNET_CROSS_LE
bool "Support for cross-endian vnet headers on little-endian kernels"
default n
help
This option allows TUN/TAP and MACVTAP device drivers in a
little-endian kernel to parse vnet headers that come from a
big-endian legacy virtio device.
Userspace programs can control the feature using the TUNSETVNETBE
and TUNGETVNETBE ioctls.
Unless you have a little-endian system hosting a big-endian virtual
machine with a legacy virtio NIC, you should say N.
config VETH
tristate "Virtual ethernet pair device"
select PAGE_POOL
help
This device is a local ethernet tunnel. Devices are created in pairs.
When one end receives the packet it appears on its pair and vice
versa.
config VIRTIO_NET
tristate "Virtio network driver"
depends on VIRTIO
select NET_FAILOVER
help
This is the virtual network driver for virtio. It can be used with
QEMU based VMMs (like KVM or Xen). Say Y or M.
config NLMON
tristate "Virtual netlink monitoring device"
help
This option enables a monitoring net device for netlink skbs. The
purpose of this is to analyze netlink messages with packet sockets.
Thus applications like tcpdump will be able to see local netlink
messages if they tap into the netlink device, record pcaps for further
diagnostics, etc. This is mostly intended for developers or support
to debug netlink issues. If unsure, say N.
config NETKIT
bool "BPF-programmable network device"
depends on BPF_SYSCALL
help
The netkit device is a virtual networking device where BPF programs
can be attached to the device(s) transmission routine in order to
implement the driver's internal logic. The device can be configured
to operate in L3 or L2 mode. If unsure, say N.
config NET_VRF
tristate "Virtual Routing and Forwarding (Lite)"
depends on IP_MULTIPLE_TABLES
depends on NET_L3_MASTER_DEV
depends on IPV6 || IPV6=n
depends on IPV6_MULTIPLE_TABLES || IPV6=n
help
This option enables the support for mapping interfaces into VRF's. The
support enables VRF devices.
config VSOCKMON
tristate "Virtual vsock monitoring device"
depends on VHOST_VSOCK
help
This option enables a monitoring net device for vsock sockets. It is
mostly intended for developers or support to debug vsock issues. If
unsure, say N.
config MHI_NET
tristate "MHI network driver"
depends on MHI_BUS
help
This is the network driver for MHI bus. It can be used with
QCOM based WWAN modems for IP or QMAP/rmnet protocol (like SDX55).
Say Y or M.
endif # NET_CORE
config SUNGEM_PHY
tristate
source "drivers/net/arcnet/Kconfig"
source "drivers/atm/Kconfig"
source "drivers/net/caif/Kconfig"
source "drivers/net/dsa/Kconfig"
source "drivers/net/ethernet/Kconfig"
source "drivers/net/fddi/Kconfig"
source "drivers/net/hippi/Kconfig"
source "drivers/net/ipa/Kconfig"
config NET_SB1000
tristate "General Instruments Surfboard 1000"
depends on PNP
help
This is a driver for the General Instrument (also known as
NextLevel) SURFboard 1000 internal
cable modem. This is an ISA card which is used by a number of cable
TV companies to provide cable modem access. It's a one-way
downstream-only cable modem, meaning that your upstream net link is
provided by your regular phone modem.
At present this driver only compiles as a module, so say M here if
you have this card. The module will be called sb1000. Then read
<file:Documentation/networking/device_drivers/cable/sb1000.rst> for
information on how to use this module, as it needs special ppp
scripts for establishing a connection. Further documentation
and the necessary scripts can be found at:
<http://www.jacksonville.net/~fventuri/>
<http://home.adelphia.net/~siglercm/sb1000.html>
<http://linuxpower.cx/~cable/>
If you don't have this card, of course say N.
source "drivers/net/phy/Kconfig"
source "drivers/net/pse-pd/Kconfig"
source "drivers/net/can/Kconfig"
source "drivers/net/mctp/Kconfig"
source "drivers/net/mdio/Kconfig"
source "drivers/net/pcs/Kconfig"
source "drivers/net/plip/Kconfig"
source "drivers/net/ppp/Kconfig"
source "drivers/net/slip/Kconfig"
source "drivers/s390/net/Kconfig"
source "drivers/net/usb/Kconfig"
source "drivers/net/wireless/Kconfig"
source "drivers/net/wan/Kconfig"
source "drivers/net/ieee802154/Kconfig"
source "drivers/net/wwan/Kconfig"
config XEN_NETDEV_FRONTEND
tristate "Xen network device frontend driver"
depends on XEN
select XEN_XENBUS_FRONTEND
select PAGE_POOL
default y
help
This driver provides support for Xen paravirtual network
devices exported by a Xen network driver domain (often
domain 0).
The corresponding Linux backend driver is enabled by the
CONFIG_XEN_NETDEV_BACKEND option.
If you are compiling a kernel for use as Xen guest, you
should say Y here. To compile this driver as a module, chose
M here: the module will be called xen-netfront.
config XEN_NETDEV_BACKEND
tristate "Xen backend network device"
depends on XEN_BACKEND
help
This driver allows the kernel to act as a Xen network driver
domain which exports paravirtual network devices to other
Xen domains. These devices can be accessed by any operating
system that implements a compatible front end.
The corresponding Linux frontend driver is enabled by the
CONFIG_XEN_NETDEV_FRONTEND configuration option.
The backend driver presents a standard network device
endpoint for each paravirtual network device to the driver
domain network stack. These can then be bridged or routed
etc in order to provide full network connectivity.
If you are compiling a kernel to run in a Xen network driver
domain (often this is domain 0) you should say Y here. To
compile this driver as a module, chose M here: the module
will be called xen-netback.
config VMXNET3
tristate "VMware VMXNET3 ethernet driver"
depends on PCI && INET
depends on PAGE_SIZE_LESS_THAN_64KB
select PAGE_POOL
help
This driver supports VMware's vmxnet3 virtual ethernet NIC.
To compile this driver as a module, choose M here: the
module will be called vmxnet3.
config FUJITSU_ES
tristate "FUJITSU Extended Socket Network Device driver"
depends on ACPI
help
This driver provides support for Extended Socket network device
on Extended Partitioning of FUJITSU PRIMEQUEST 2000 E2 series.
source "drivers/net/thunderbolt/Kconfig"
source "drivers/net/hyperv/Kconfig"
config NETDEVSIM
tristate "Simulated networking device"
depends on DEBUG_FS
depends on INET
depends on IPV6 || IPV6=n
depends on PSAMPLE || PSAMPLE=n
depends on PTP_1588_CLOCK_MOCK || PTP_1588_CLOCK_MOCK=n
select NET_DEVLINK
help
This driver is a developer testing tool and software model that can
be used to test various control path networking APIs, especially
HW-offload related.
To compile this driver as a module, choose M here: the module
will be called netdevsim.
config NET_FAILOVER
tristate "Failover driver"
select FAILOVER
help
This provides an automated failover mechanism via APIs to create
and destroy a failover master netdev and manages a primary and
standby slave netdevs that get registered via the generic failover
infrastructure. This can be used by paravirtual drivers to enable
an alternate low latency datapath. It also enables live migration of
a VM with direct attached VF by failing over to the paravirtual
datapath when the VF is unplugged.
config NETDEV_LEGACY_INIT
bool
depends on ISA
help
Drivers that call netdev_boot_setup_check() should select this
symbol, everything else no longer needs it.
endif # NETDEVICES
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