# SPDX-License-Identifier: GPL-2.0-only
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#
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# Network configuration
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#
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menuconfig NET
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bool "Networking support"
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select NLATTR
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select GENERIC_NET_UTILS
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select BPF
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help
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Unless you really know what you are doing, you should say Y here.
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The reason is that some programs need kernel networking support even
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when running on a stand-alone machine that isn't connected to any
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other computer.
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If you are upgrading from an older kernel, you
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should consider updating your networking tools too because changes
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in the kernel and the tools often go hand in hand. The tools are
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contained in the package net-tools, the location and version number
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of which are given in <file:Documentation/Changes>.
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For a general introduction to Linux networking, it is highly
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recommended to read the NET-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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if NET
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config WANT_COMPAT_NETLINK_MESSAGES
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bool
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help
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This option can be selected by other options that need compat
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netlink messages.
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config COMPAT_NETLINK_MESSAGES
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def_bool y
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depends on COMPAT
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depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
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help
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This option makes it possible to send different netlink messages
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to tasks depending on whether the task is a compat task or not. To
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achieve this, you need to set skb_shinfo(skb)->frag_list to the
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compat skb before sending the skb, the netlink code will sort out
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which message to actually pass to the task.
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Newly written code should NEVER need this option but do
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compat-independent messages instead!
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config NET_INGRESS
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bool
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config NET_EGRESS
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bool
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config NET_REDIRECT
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bool
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config SKB_EXTENSIONS
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bool
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menu "Networking options"
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source "net/packet/Kconfig"
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source "net/unix/Kconfig"
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source "net/tls/Kconfig"
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source "net/xfrm/Kconfig"
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source "net/iucv/Kconfig"
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source "net/smc/Kconfig"
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source "net/xdp/Kconfig"
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config INET
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bool "TCP/IP networking"
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help
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These are the protocols used on the Internet and on most local
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Ethernets. It is highly recommended to say Y here (this will enlarge
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your kernel by about 400 KB), since some programs (e.g. the X window
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system) use TCP/IP even if your machine is not connected to any
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other computer. You will get the so-called loopback device which
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allows you to ping yourself (great fun, that!).
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For an excellent introduction to Linux networking, please read the
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Linux Networking HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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If you say Y here and also to "/proc file system support" and
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"Sysctl support" below, you can change various aspects of the
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behavior of the TCP/IP code by writing to the (virtual) files in
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/proc/sys/net/ipv4/*; the options are explained in the file
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<file:Documentation/networking/ip-sysctl.rst>.
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Short answer: say Y.
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if INET
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source "net/ipv4/Kconfig"
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source "net/ipv6/Kconfig"
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source "net/netlabel/Kconfig"
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source "net/mptcp/Kconfig"
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endif # if INET
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config NETWORK_SECMARK
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bool "Security Marking"
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help
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This enables security marking of network packets, similar
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to nfmark, but designated for security purposes.
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If you are unsure how to answer this question, answer N.
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config NET_PTP_CLASSIFY
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def_bool n
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config NETWORK_PHY_TIMESTAMPING
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bool "Timestamping in PHY devices"
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select NET_PTP_CLASSIFY
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help
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This allows timestamping of network packets by PHYs (or
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other MII bus snooping devices) with hardware timestamping
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capabilities. This option adds some overhead in the transmit
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and receive paths.
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If you are unsure how to answer this question, answer N.
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menuconfig NETFILTER
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bool "Network packet filtering framework (Netfilter)"
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help
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Netfilter is a framework for filtering and mangling network packets
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that pass through your Linux box.
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The most common use of packet filtering is to run your Linux box as
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a firewall protecting a local network from the Internet. The type of
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firewall provided by this kernel support is called a "packet
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filter", which means that it can reject individual network packets
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based on type, source, destination etc. The other kind of firewall,
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a "proxy-based" one, is more secure but more intrusive and more
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bothersome to set up; it inspects the network traffic much more
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closely, modifies it and has knowledge about the higher level
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protocols, which a packet filter lacks. Moreover, proxy-based
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firewalls often require changes to the programs running on the local
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clients. Proxy-based firewalls don't need support by the kernel, but
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they are often combined with a packet filter, which only works if
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you say Y here.
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You should also say Y here if you intend to use your Linux box as
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the gateway to the Internet for a local network of machines without
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globally valid IP addresses. This is called "masquerading": if one
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of the computers on your local network wants to send something to
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the outside, your box can "masquerade" as that computer, i.e. it
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forwards the traffic to the intended outside destination, but
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modifies the packets to make it look like they came from the
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firewall box itself. It works both ways: if the outside host
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replies, the Linux box will silently forward the traffic to the
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correct local computer. This way, the computers on your local net
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are completely invisible to the outside world, even though they can
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reach the outside and can receive replies. It is even possible to
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run globally visible servers from within a masqueraded local network
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using a mechanism called portforwarding. Masquerading is also often
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called NAT (Network Address Translation).
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Another use of Netfilter is in transparent proxying: if a machine on
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the local network tries to connect to an outside host, your Linux
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box can transparently forward the traffic to a local server,
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typically a caching proxy server.
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Yet another use of Netfilter is building a bridging firewall. Using
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a bridge with Network packet filtering enabled makes iptables "see"
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the bridged traffic. For filtering on the lower network and Ethernet
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protocols over the bridge, use ebtables (under bridge netfilter
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configuration).
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Various modules exist for netfilter which replace the previous
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masquerading (ipmasqadm), packet filtering (ipchains), transparent
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proxying, and portforwarding mechanisms. Please see
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<file:Documentation/Changes> under "iptables" for the location of
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these packages.
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if NETFILTER
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config NETFILTER_ADVANCED
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bool "Advanced netfilter configuration"
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depends on NETFILTER
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default y
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help
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If you say Y here you can select between all the netfilter modules.
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If you say N the more unusual ones will not be shown and the
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basic ones needed by most people will default to 'M'.
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If unsure, say Y.
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config BRIDGE_NETFILTER
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tristate "Bridged IP/ARP packets filtering"
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depends on BRIDGE
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depends on NETFILTER && INET
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depends on NETFILTER_ADVANCED
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select NETFILTER_FAMILY_BRIDGE
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select SKB_EXTENSIONS
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help
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Enabling this option will let arptables resp. iptables see bridged
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ARP resp. IP traffic. If you want a bridging firewall, you probably
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want this option enabled.
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Enabling or disabling this option doesn't enable or disable
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ebtables.
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If unsure, say N.
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source "net/netfilter/Kconfig"
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source "net/ipv4/netfilter/Kconfig"
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source "net/ipv6/netfilter/Kconfig"
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source "net/decnet/netfilter/Kconfig"
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source "net/bridge/netfilter/Kconfig"
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endif
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source "net/bpfilter/Kconfig"
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source "net/dccp/Kconfig"
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source "net/sctp/Kconfig"
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source "net/rds/Kconfig"
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source "net/tipc/Kconfig"
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source "net/atm/Kconfig"
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source "net/l2tp/Kconfig"
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source "net/802/Kconfig"
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source "net/bridge/Kconfig"
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source "net/dsa/Kconfig"
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source "net/8021q/Kconfig"
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source "net/decnet/Kconfig"
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source "net/llc/Kconfig"
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source "drivers/net/appletalk/Kconfig"
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source "net/x25/Kconfig"
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source "net/lapb/Kconfig"
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source "net/phonet/Kconfig"
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source "net/6lowpan/Kconfig"
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source "net/ieee802154/Kconfig"
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source "net/mac802154/Kconfig"
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source "net/sched/Kconfig"
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source "net/dcb/Kconfig"
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source "net/dns_resolver/Kconfig"
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source "net/batman-adv/Kconfig"
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source "net/openvswitch/Kconfig"
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source "net/vmw_vsock/Kconfig"
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source "net/netlink/Kconfig"
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source "net/mpls/Kconfig"
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source "net/nsh/Kconfig"
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source "net/hsr/Kconfig"
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source "net/switchdev/Kconfig"
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source "net/l3mdev/Kconfig"
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source "net/qrtr/Kconfig"
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source "net/ncsi/Kconfig"
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config RPS
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bool
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depends on SMP && SYSFS
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default y
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config RFS_ACCEL
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bool
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depends on RPS
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select CPU_RMAP
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default y
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config XPS
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bool
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depends on SMP
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default y
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config HWBM
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bool
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config CGROUP_NET_PRIO
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bool "Network priority cgroup"
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depends on CGROUPS
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select SOCK_CGROUP_DATA
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help
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Cgroup subsystem for use in assigning processes to network priorities on
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a per-interface basis.
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config CGROUP_NET_CLASSID
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bool "Network classid cgroup"
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depends on CGROUPS
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select SOCK_CGROUP_DATA
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help
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Cgroup subsystem for use as general purpose socket classid marker that is
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being used in cls_cgroup and for netfilter matching.
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config NET_RX_BUSY_POLL
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bool
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default y if !PREEMPT_RT
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config BQL
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bool
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depends on SYSFS
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select DQL
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default y
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config BPF_JIT
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bool "enable BPF Just In Time compiler"
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depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
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depends on MODULES
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help
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Berkeley Packet Filter filtering capabilities are normally handled
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by an interpreter. This option allows kernel to generate a native
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code when filter is loaded in memory. This should speedup
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packet sniffing (libpcap/tcpdump).
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Note, admin should enable this feature changing:
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/proc/sys/net/core/bpf_jit_enable
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/proc/sys/net/core/bpf_jit_harden (optional)
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/proc/sys/net/core/bpf_jit_kallsyms (optional)
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config BPF_STREAM_PARSER
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bool "enable BPF STREAM_PARSER"
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depends on INET
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depends on BPF_SYSCALL
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depends on CGROUP_BPF
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select STREAM_PARSER
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select NET_SOCK_MSG
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help
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Enabling this allows a stream parser to be used with
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BPF_MAP_TYPE_SOCKMAP.
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BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
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It can be used to enforce socket policy, implement socket redirects,
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etc.
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config NET_FLOW_LIMIT
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bool
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depends on RPS
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default y
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help
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The network stack has to drop packets when a receive processing CPU's
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backlog reaches netdev_max_backlog. If a few out of many active flows
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generate the vast majority of load, drop their traffic earlier to
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maintain capacity for the other flows. This feature provides servers
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with many clients some protection against DoS by a single (spoofed)
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flow that greatly exceeds average workload.
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menu "Network testing"
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config NET_PKTGEN
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tristate "Packet Generator (USE WITH CAUTION)"
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depends on INET && PROC_FS
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help
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This module will inject preconfigured packets, at a configurable
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rate, out of a given interface. It is used for network interface
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stress testing and performance analysis. If you don't understand
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what was just said, you don't need it: say N.
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Documentation on how to use the packet generator can be found
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at <file:Documentation/networking/pktgen.rst>.
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To compile this code as a module, choose M here: the
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module will be called pktgen.
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config NET_DROP_MONITOR
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tristate "Network packet drop alerting service"
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depends on INET && TRACEPOINTS
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help
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This feature provides an alerting service to userspace in the
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event that packets are discarded in the network stack. Alerts
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are broadcast via netlink socket to any listening user space
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process. If you don't need network drop alerts, or if you are ok
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just checking the various proc files and other utilities for
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drop statistics, say N here.
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endmenu
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endmenu
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source "net/ax25/Kconfig"
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source "net/can/Kconfig"
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source "net/bluetooth/Kconfig"
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source "net/rxrpc/Kconfig"
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source "net/kcm/Kconfig"
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source "net/strparser/Kconfig"
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config FIB_RULES
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bool
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menuconfig WIRELESS
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bool "Wireless"
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depends on !S390
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default y
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if WIRELESS
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source "net/wireless/Kconfig"
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source "net/mac80211/Kconfig"
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endif # WIRELESS
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source "net/wimax/Kconfig"
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source "net/rfkill/Kconfig"
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source "net/9p/Kconfig"
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source "net/caif/Kconfig"
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source "net/ceph/Kconfig"
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source "net/nfc/Kconfig"
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source "net/psample/Kconfig"
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source "net/ife/Kconfig"
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config LWTUNNEL
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bool "Network light weight tunnels"
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help
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This feature provides an infrastructure to support light weight
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tunnels like mpls. There is no netdevice associated with a light
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weight tunnel endpoint. Tunnel encapsulation parameters are stored
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with light weight tunnel state associated with fib routes.
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config LWTUNNEL_BPF
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bool "Execute BPF program as route nexthop action"
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depends on LWTUNNEL && INET
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default y if LWTUNNEL=y
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help
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Allows to run BPF programs as a nexthop action following a route
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lookup for incoming and outgoing packets.
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config DST_CACHE
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bool
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default n
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config GRO_CELLS
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bool
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default n
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config SOCK_VALIDATE_XMIT
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bool
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config NET_SOCK_MSG
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bool
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default n
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help
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The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
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ULPs (upper layer modules, e.g. TLS) to process L7 application data
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with the help of BPF programs.
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config NET_DEVLINK
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bool
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default n
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config PAGE_POOL
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bool
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config FAILOVER
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tristate "Generic failover module"
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help
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The failover module provides a generic interface for paravirtual
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drivers to register a netdev and a set of ops with a failover
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instance. The ops are used as event handlers that get called to
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handle netdev register/unregister/link change/name change events
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on slave pci ethernet devices with the same mac address as the
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failover netdev. This enables paravirtual drivers to use a
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VF as an accelerated low latency datapath. It also allows live
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migration of VMs with direct attached VFs by failing over to the
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paravirtual datapath when the VF is unplugged.
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config ETHTOOL_NETLINK
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bool "Netlink interface for ethtool"
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default y
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help
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An alternative userspace interface for ethtool based on generic
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netlink. It provides better extensibility and some new features,
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e.g. notification messages.
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endif # if NET
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# Used by archs to tell that they support BPF JIT compiler plus which flavour.
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# Only one of the two can be selected for a specific arch since eBPF JIT supersedes
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# the cBPF JIT.
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# Classic BPF JIT (cBPF)
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config HAVE_CBPF_JIT
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bool
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# Extended BPF JIT (eBPF)
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config HAVE_EBPF_JIT
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bool
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