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