1 # SPDX-License-Identifier: GPL-2.0-only
3 # Network configuration
7 bool "Networking support"
9 select GENERIC_NET_UTILS
12 Unless you really know what you are doing, you should say Y here.
13 The reason is that some programs need kernel networking support even
14 when running on a stand-alone machine that isn't connected to any
17 If you are upgrading from an older kernel, you
18 should consider updating your networking tools too because changes
19 in the kernel and the tools often go hand in hand. The tools are
20 contained in the package net-tools, the location and version number
21 of which are given in <file:Documentation/Changes>.
23 For a general introduction to Linux networking, it is highly
24 recommended to read the NET-HOWTO, available from
25 <http://www.tldp.org/docs.html#howto>.
29 config WANT_COMPAT_NETLINK_MESSAGES
32 This option can be selected by other options that need compat
35 config COMPAT_NETLINK_MESSAGES
38 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
40 This option makes it possible to send different netlink messages
41 to tasks depending on whether the task is a compat task or not. To
42 achieve this, you need to set skb_shinfo(skb)->frag_list to the
43 compat skb before sending the skb, the netlink code will sort out
44 which message to actually pass to the task.
46 Newly written code should NEVER need this option but do
47 compat-independent messages instead!
58 menu "Networking options"
60 source "net/packet/Kconfig"
61 source "net/unix/Kconfig"
62 source "net/tls/Kconfig"
63 source "net/xfrm/Kconfig"
64 source "net/iucv/Kconfig"
65 source "net/smc/Kconfig"
66 source "net/xdp/Kconfig"
69 bool "TCP/IP networking"
71 These are the protocols used on the Internet and on most local
72 Ethernets. It is highly recommended to say Y here (this will enlarge
73 your kernel by about 400 KB), since some programs (e.g. the X window
74 system) use TCP/IP even if your machine is not connected to any
75 other computer. You will get the so-called loopback device which
76 allows you to ping yourself (great fun, that!).
78 For an excellent introduction to Linux networking, please read the
79 Linux Networking HOWTO, available from
80 <http://www.tldp.org/docs.html#howto>.
82 If you say Y here and also to "/proc file system support" and
83 "Sysctl support" below, you can change various aspects of the
84 behavior of the TCP/IP code by writing to the (virtual) files in
85 /proc/sys/net/ipv4/*; the options are explained in the file
86 <file:Documentation/networking/ip-sysctl.txt>.
91 source "net/ipv4/Kconfig"
92 source "net/ipv6/Kconfig"
93 source "net/netlabel/Kconfig"
97 config NETWORK_SECMARK
98 bool "Security Marking"
100 This enables security marking of network packets, similar
101 to nfmark, but designated for security purposes.
102 If you are unsure how to answer this question, answer N.
104 config NET_PTP_CLASSIFY
107 config NETWORK_PHY_TIMESTAMPING
108 bool "Timestamping in PHY devices"
109 select NET_PTP_CLASSIFY
111 This allows timestamping of network packets by PHYs with
112 hardware timestamping capabilities. This option adds some
113 overhead in the transmit and receive paths.
115 If you are unsure how to answer this question, answer N.
118 bool "Network packet filtering framework (Netfilter)"
120 Netfilter is a framework for filtering and mangling network packets
121 that pass through your Linux box.
123 The most common use of packet filtering is to run your Linux box as
124 a firewall protecting a local network from the Internet. The type of
125 firewall provided by this kernel support is called a "packet
126 filter", which means that it can reject individual network packets
127 based on type, source, destination etc. The other kind of firewall,
128 a "proxy-based" one, is more secure but more intrusive and more
129 bothersome to set up; it inspects the network traffic much more
130 closely, modifies it and has knowledge about the higher level
131 protocols, which a packet filter lacks. Moreover, proxy-based
132 firewalls often require changes to the programs running on the local
133 clients. Proxy-based firewalls don't need support by the kernel, but
134 they are often combined with a packet filter, which only works if
137 You should also say Y here if you intend to use your Linux box as
138 the gateway to the Internet for a local network of machines without
139 globally valid IP addresses. This is called "masquerading": if one
140 of the computers on your local network wants to send something to
141 the outside, your box can "masquerade" as that computer, i.e. it
142 forwards the traffic to the intended outside destination, but
143 modifies the packets to make it look like they came from the
144 firewall box itself. It works both ways: if the outside host
145 replies, the Linux box will silently forward the traffic to the
146 correct local computer. This way, the computers on your local net
147 are completely invisible to the outside world, even though they can
148 reach the outside and can receive replies. It is even possible to
149 run globally visible servers from within a masqueraded local network
150 using a mechanism called portforwarding. Masquerading is also often
151 called NAT (Network Address Translation).
153 Another use of Netfilter is in transparent proxying: if a machine on
154 the local network tries to connect to an outside host, your Linux
155 box can transparently forward the traffic to a local server,
156 typically a caching proxy server.
158 Yet another use of Netfilter is building a bridging firewall. Using
159 a bridge with Network packet filtering enabled makes iptables "see"
160 the bridged traffic. For filtering on the lower network and Ethernet
161 protocols over the bridge, use ebtables (under bridge netfilter
164 Various modules exist for netfilter which replace the previous
165 masquerading (ipmasqadm), packet filtering (ipchains), transparent
166 proxying, and portforwarding mechanisms. Please see
167 <file:Documentation/Changes> under "iptables" for the location of
172 config NETFILTER_ADVANCED
173 bool "Advanced netfilter configuration"
177 If you say Y here you can select between all the netfilter modules.
178 If you say N the more unusual ones will not be shown and the
179 basic ones needed by most people will default to 'M'.
183 config BRIDGE_NETFILTER
184 tristate "Bridged IP/ARP packets filtering"
186 depends on NETFILTER && INET
187 depends on NETFILTER_ADVANCED
188 select NETFILTER_FAMILY_BRIDGE
189 select SKB_EXTENSIONS
192 Enabling this option will let arptables resp. iptables see bridged
193 ARP resp. IP traffic. If you want a bridging firewall, you probably
194 want this option enabled.
195 Enabling or disabling this option doesn't enable or disable
200 source "net/netfilter/Kconfig"
201 source "net/ipv4/netfilter/Kconfig"
202 source "net/ipv6/netfilter/Kconfig"
203 source "net/decnet/netfilter/Kconfig"
204 source "net/bridge/netfilter/Kconfig"
208 source "net/bpfilter/Kconfig"
210 source "net/dccp/Kconfig"
211 source "net/sctp/Kconfig"
212 source "net/rds/Kconfig"
213 source "net/tipc/Kconfig"
214 source "net/atm/Kconfig"
215 source "net/l2tp/Kconfig"
216 source "net/802/Kconfig"
217 source "net/bridge/Kconfig"
218 source "net/dsa/Kconfig"
219 source "net/8021q/Kconfig"
220 source "net/decnet/Kconfig"
221 source "net/llc/Kconfig"
222 source "drivers/net/appletalk/Kconfig"
223 source "net/x25/Kconfig"
224 source "net/lapb/Kconfig"
225 source "net/phonet/Kconfig"
226 source "net/6lowpan/Kconfig"
227 source "net/ieee802154/Kconfig"
228 source "net/mac802154/Kconfig"
229 source "net/sched/Kconfig"
230 source "net/dcb/Kconfig"
231 source "net/dns_resolver/Kconfig"
232 source "net/batman-adv/Kconfig"
233 source "net/openvswitch/Kconfig"
234 source "net/vmw_vsock/Kconfig"
235 source "net/netlink/Kconfig"
236 source "net/mpls/Kconfig"
237 source "net/nsh/Kconfig"
238 source "net/hsr/Kconfig"
239 source "net/switchdev/Kconfig"
240 source "net/l3mdev/Kconfig"
241 source "net/qrtr/Kconfig"
242 source "net/ncsi/Kconfig"
246 depends on SMP && SYSFS
263 config CGROUP_NET_PRIO
264 bool "Network priority cgroup"
266 select SOCK_CGROUP_DATA
268 Cgroup subsystem for use in assigning processes to network priorities on
269 a per-interface basis.
271 config CGROUP_NET_CLASSID
272 bool "Network classid cgroup"
274 select SOCK_CGROUP_DATA
276 Cgroup subsystem for use as general purpose socket classid marker that is
277 being used in cls_cgroup and for netfilter matching.
279 config NET_RX_BUSY_POLL
290 bool "enable BPF Just In Time compiler"
291 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
294 Berkeley Packet Filter filtering capabilities are normally handled
295 by an interpreter. This option allows kernel to generate a native
296 code when filter is loaded in memory. This should speedup
297 packet sniffing (libpcap/tcpdump).
299 Note, admin should enable this feature changing:
300 /proc/sys/net/core/bpf_jit_enable
301 /proc/sys/net/core/bpf_jit_harden (optional)
302 /proc/sys/net/core/bpf_jit_kallsyms (optional)
304 config BPF_STREAM_PARSER
305 bool "enable BPF STREAM_PARSER"
307 depends on BPF_SYSCALL
308 depends on CGROUP_BPF
312 Enabling this allows a stream parser to be used with
313 BPF_MAP_TYPE_SOCKMAP.
315 BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
316 It can be used to enforce socket policy, implement socket redirects,
319 config NET_FLOW_LIMIT
324 The network stack has to drop packets when a receive processing CPU's
325 backlog reaches netdev_max_backlog. If a few out of many active flows
326 generate the vast majority of load, drop their traffic earlier to
327 maintain capacity for the other flows. This feature provides servers
328 with many clients some protection against DoS by a single (spoofed)
329 flow that greatly exceeds average workload.
331 menu "Network testing"
334 tristate "Packet Generator (USE WITH CAUTION)"
335 depends on INET && PROC_FS
337 This module will inject preconfigured packets, at a configurable
338 rate, out of a given interface. It is used for network interface
339 stress testing and performance analysis. If you don't understand
340 what was just said, you don't need it: say N.
342 Documentation on how to use the packet generator can be found
343 at <file:Documentation/networking/pktgen.txt>.
345 To compile this code as a module, choose M here: the
346 module will be called pktgen.
348 config NET_DROP_MONITOR
349 tristate "Network packet drop alerting service"
350 depends on INET && TRACEPOINTS
352 This feature provides an alerting service to userspace in the
353 event that packets are discarded in the network stack. Alerts
354 are broadcast via netlink socket to any listening user space
355 process. If you don't need network drop alerts, or if you are ok
356 just checking the various proc files and other utilities for
357 drop statistics, say N here.
363 source "net/ax25/Kconfig"
364 source "net/can/Kconfig"
365 source "net/bluetooth/Kconfig"
366 source "net/rxrpc/Kconfig"
367 source "net/kcm/Kconfig"
368 source "net/strparser/Kconfig"
380 source "net/wireless/Kconfig"
381 source "net/mac80211/Kconfig"
385 source "net/wimax/Kconfig"
387 source "net/rfkill/Kconfig"
388 source "net/9p/Kconfig"
389 source "net/caif/Kconfig"
390 source "net/ceph/Kconfig"
391 source "net/nfc/Kconfig"
392 source "net/psample/Kconfig"
393 source "net/ife/Kconfig"
396 bool "Network light weight tunnels"
398 This feature provides an infrastructure to support light weight
399 tunnels like mpls. There is no netdevice associated with a light
400 weight tunnel endpoint. Tunnel encapsulation parameters are stored
401 with light weight tunnel state associated with fib routes.
404 bool "Execute BPF program as route nexthop action"
405 depends on LWTUNNEL && INET
406 default y if LWTUNNEL=y
408 Allows to run BPF programs as a nexthop action following a route
409 lookup for incoming and outgoing packets.
419 config SOCK_VALIDATE_XMIT
426 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
427 ULPs (upper layer modules, e.g. TLS) to process L7 application data
428 with the help of BPF programs.
433 imply NET_DROP_MONITOR
439 tristate "Generic failover module"
441 The failover module provides a generic interface for paravirtual
442 drivers to register a netdev and a set of ops with a failover
443 instance. The ops are used as event handlers that get called to
444 handle netdev register/unregister/link change/name change events
445 on slave pci ethernet devices with the same mac address as the
446 failover netdev. This enables paravirtual drivers to use a
447 VF as an accelerated low latency datapath. It also allows live
448 migration of VMs with direct attached VFs by failing over to the
449 paravirtual datapath when the VF is unplugged.
453 # Used by archs to tell that they support BPF JIT compiler plus which flavour.
454 # Only one of the two can be selected for a specific arch since eBPF JIT supersedes
457 # Classic BPF JIT (cBPF)
461 # Extended BPF JIT (eBPF)