Linux kernel mirror (for testing)
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kernel
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linux
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Network configuration
4#
5
6menuconfig NET
7 bool "Networking support"
8 select NLATTR
9 select GENERIC_NET_UTILS
10 select BPF
11 help
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
15 other computer.
16
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>.
22
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>.
26
27if NET
28
29config WANT_COMPAT_NETLINK_MESSAGES
30 bool
31 help
32 This option can be selected by other options that need compat
33 netlink messages.
34
35config COMPAT_NETLINK_MESSAGES
36 def_bool y
37 depends on COMPAT
38 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
39 help
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.
45
46 Newly written code should NEVER need this option but do
47 compat-independent messages instead!
48
49config NET_INGRESS
50 bool
51
52config NET_EGRESS
53 bool
54
55config NET_REDIRECT
56 bool
57
58config SKB_EXTENSIONS
59 bool
60
61menu "Networking options"
62
63source "net/packet/Kconfig"
64source "net/unix/Kconfig"
65source "net/tls/Kconfig"
66source "net/xfrm/Kconfig"
67source "net/iucv/Kconfig"
68source "net/smc/Kconfig"
69source "net/xdp/Kconfig"
70
71config INET
72 bool "TCP/IP networking"
73 help
74 These are the protocols used on the Internet and on most local
75 Ethernets. It is highly recommended to say Y here (this will enlarge
76 your kernel by about 400 KB), since some programs (e.g. the X window
77 system) use TCP/IP even if your machine is not connected to any
78 other computer. You will get the so-called loopback device which
79 allows you to ping yourself (great fun, that!).
80
81 For an excellent introduction to Linux networking, please read the
82 Linux Networking HOWTO, available from
83 <http://www.tldp.org/docs.html#howto>.
84
85 If you say Y here and also to "/proc file system support" and
86 "Sysctl support" below, you can change various aspects of the
87 behavior of the TCP/IP code by writing to the (virtual) files in
88 /proc/sys/net/ipv4/*; the options are explained in the file
89 <file:Documentation/networking/ip-sysctl.rst>.
90
91 Short answer: say Y.
92
93if INET
94source "net/ipv4/Kconfig"
95source "net/ipv6/Kconfig"
96source "net/netlabel/Kconfig"
97source "net/mptcp/Kconfig"
98
99endif # if INET
100
101config NETWORK_SECMARK
102 bool "Security Marking"
103 help
104 This enables security marking of network packets, similar
105 to nfmark, but designated for security purposes.
106 If you are unsure how to answer this question, answer N.
107
108config NET_PTP_CLASSIFY
109 def_bool n
110
111config NETWORK_PHY_TIMESTAMPING
112 bool "Timestamping in PHY devices"
113 select NET_PTP_CLASSIFY
114 help
115 This allows timestamping of network packets by PHYs (or
116 other MII bus snooping devices) with hardware timestamping
117 capabilities. This option adds some overhead in the transmit
118 and receive paths.
119
120 If you are unsure how to answer this question, answer N.
121
122menuconfig NETFILTER
123 bool "Network packet filtering framework (Netfilter)"
124 help
125 Netfilter is a framework for filtering and mangling network packets
126 that pass through your Linux box.
127
128 The most common use of packet filtering is to run your Linux box as
129 a firewall protecting a local network from the Internet. The type of
130 firewall provided by this kernel support is called a "packet
131 filter", which means that it can reject individual network packets
132 based on type, source, destination etc. The other kind of firewall,
133 a "proxy-based" one, is more secure but more intrusive and more
134 bothersome to set up; it inspects the network traffic much more
135 closely, modifies it and has knowledge about the higher level
136 protocols, which a packet filter lacks. Moreover, proxy-based
137 firewalls often require changes to the programs running on the local
138 clients. Proxy-based firewalls don't need support by the kernel, but
139 they are often combined with a packet filter, which only works if
140 you say Y here.
141
142 You should also say Y here if you intend to use your Linux box as
143 the gateway to the Internet for a local network of machines without
144 globally valid IP addresses. This is called "masquerading": if one
145 of the computers on your local network wants to send something to
146 the outside, your box can "masquerade" as that computer, i.e. it
147 forwards the traffic to the intended outside destination, but
148 modifies the packets to make it look like they came from the
149 firewall box itself. It works both ways: if the outside host
150 replies, the Linux box will silently forward the traffic to the
151 correct local computer. This way, the computers on your local net
152 are completely invisible to the outside world, even though they can
153 reach the outside and can receive replies. It is even possible to
154 run globally visible servers from within a masqueraded local network
155 using a mechanism called portforwarding. Masquerading is also often
156 called NAT (Network Address Translation).
157
158 Another use of Netfilter is in transparent proxying: if a machine on
159 the local network tries to connect to an outside host, your Linux
160 box can transparently forward the traffic to a local server,
161 typically a caching proxy server.
162
163 Yet another use of Netfilter is building a bridging firewall. Using
164 a bridge with Network packet filtering enabled makes iptables "see"
165 the bridged traffic. For filtering on the lower network and Ethernet
166 protocols over the bridge, use ebtables (under bridge netfilter
167 configuration).
168
169 Various modules exist for netfilter which replace the previous
170 masquerading (ipmasqadm), packet filtering (ipchains), transparent
171 proxying, and portforwarding mechanisms. Please see
172 <file:Documentation/Changes> under "iptables" for the location of
173 these packages.
174
175if NETFILTER
176
177config NETFILTER_ADVANCED
178 bool "Advanced netfilter configuration"
179 depends on NETFILTER
180 default y
181 help
182 If you say Y here you can select between all the netfilter modules.
183 If you say N the more unusual ones will not be shown and the
184 basic ones needed by most people will default to 'M'.
185
186 If unsure, say Y.
187
188config BRIDGE_NETFILTER
189 tristate "Bridged IP/ARP packets filtering"
190 depends on BRIDGE
191 depends on NETFILTER && INET
192 depends on NETFILTER_ADVANCED
193 select NETFILTER_FAMILY_BRIDGE
194 select SKB_EXTENSIONS
195 help
196 Enabling this option will let arptables resp. iptables see bridged
197 ARP resp. IP traffic. If you want a bridging firewall, you probably
198 want this option enabled.
199 Enabling or disabling this option doesn't enable or disable
200 ebtables.
201
202 If unsure, say N.
203
204source "net/netfilter/Kconfig"
205source "net/ipv4/netfilter/Kconfig"
206source "net/ipv6/netfilter/Kconfig"
207source "net/bridge/netfilter/Kconfig"
208
209endif
210
211source "net/bpfilter/Kconfig"
212
213source "net/dccp/Kconfig"
214source "net/sctp/Kconfig"
215source "net/rds/Kconfig"
216source "net/tipc/Kconfig"
217source "net/atm/Kconfig"
218source "net/l2tp/Kconfig"
219source "net/802/Kconfig"
220source "net/bridge/Kconfig"
221source "net/dsa/Kconfig"
222source "net/8021q/Kconfig"
223source "net/llc/Kconfig"
224source "drivers/net/appletalk/Kconfig"
225source "net/x25/Kconfig"
226source "net/lapb/Kconfig"
227source "net/phonet/Kconfig"
228source "net/6lowpan/Kconfig"
229source "net/ieee802154/Kconfig"
230source "net/mac802154/Kconfig"
231source "net/sched/Kconfig"
232source "net/dcb/Kconfig"
233source "net/dns_resolver/Kconfig"
234source "net/batman-adv/Kconfig"
235source "net/openvswitch/Kconfig"
236source "net/vmw_vsock/Kconfig"
237source "net/netlink/Kconfig"
238source "net/mpls/Kconfig"
239source "net/nsh/Kconfig"
240source "net/hsr/Kconfig"
241source "net/switchdev/Kconfig"
242source "net/l3mdev/Kconfig"
243source "net/qrtr/Kconfig"
244source "net/ncsi/Kconfig"
245
246config PCPU_DEV_REFCNT
247 bool "Use percpu variables to maintain network device refcount"
248 depends on SMP
249 default y
250 help
251 network device refcount are using per cpu variables if this option is set.
252 This can be forced to N to detect underflows (with a performance drop).
253
254config RPS
255 bool
256 depends on SMP && SYSFS
257 default y
258
259config RFS_ACCEL
260 bool
261 depends on RPS
262 select CPU_RMAP
263 default y
264
265config SOCK_RX_QUEUE_MAPPING
266 bool
267
268config XPS
269 bool
270 depends on SMP
271 select SOCK_RX_QUEUE_MAPPING
272 default y
273
274config HWBM
275 bool
276
277config CGROUP_NET_PRIO
278 bool "Network priority cgroup"
279 depends on CGROUPS
280 select SOCK_CGROUP_DATA
281 help
282 Cgroup subsystem for use in assigning processes to network priorities on
283 a per-interface basis.
284
285config CGROUP_NET_CLASSID
286 bool "Network classid cgroup"
287 depends on CGROUPS
288 select SOCK_CGROUP_DATA
289 help
290 Cgroup subsystem for use as general purpose socket classid marker that is
291 being used in cls_cgroup and for netfilter matching.
292
293config NET_RX_BUSY_POLL
294 bool
295 default y if !PREEMPT_RT
296
297config BQL
298 bool
299 depends on SYSFS
300 select DQL
301 default y
302
303config BPF_STREAM_PARSER
304 bool "enable BPF STREAM_PARSER"
305 depends on INET
306 depends on BPF_SYSCALL
307 depends on CGROUP_BPF
308 select STREAM_PARSER
309 select NET_SOCK_MSG
310 help
311 Enabling this allows a TCP stream parser to be used with
312 BPF_MAP_TYPE_SOCKMAP.
313
314config NET_FLOW_LIMIT
315 bool
316 depends on RPS
317 default y
318 help
319 The network stack has to drop packets when a receive processing CPU's
320 backlog reaches netdev_max_backlog. If a few out of many active flows
321 generate the vast majority of load, drop their traffic earlier to
322 maintain capacity for the other flows. This feature provides servers
323 with many clients some protection against DoS by a single (spoofed)
324 flow that greatly exceeds average workload.
325
326menu "Network testing"
327
328config NET_PKTGEN
329 tristate "Packet Generator (USE WITH CAUTION)"
330 depends on INET && PROC_FS
331 help
332 This module will inject preconfigured packets, at a configurable
333 rate, out of a given interface. It is used for network interface
334 stress testing and performance analysis. If you don't understand
335 what was just said, you don't need it: say N.
336
337 Documentation on how to use the packet generator can be found
338 at <file:Documentation/networking/pktgen.rst>.
339
340 To compile this code as a module, choose M here: the
341 module will be called pktgen.
342
343config NET_DROP_MONITOR
344 tristate "Network packet drop alerting service"
345 depends on INET && TRACEPOINTS
346 help
347 This feature provides an alerting service to userspace in the
348 event that packets are discarded in the network stack. Alerts
349 are broadcast via netlink socket to any listening user space
350 process. If you don't need network drop alerts, or if you are ok
351 just checking the various proc files and other utilities for
352 drop statistics, say N here.
353
354endmenu
355
356endmenu
357
358source "net/ax25/Kconfig"
359source "net/can/Kconfig"
360source "net/bluetooth/Kconfig"
361source "net/rxrpc/Kconfig"
362source "net/kcm/Kconfig"
363source "net/strparser/Kconfig"
364source "net/mctp/Kconfig"
365
366config FIB_RULES
367 bool
368
369menuconfig WIRELESS
370 bool "Wireless"
371 depends on !S390
372 default y
373
374if WIRELESS
375
376source "net/wireless/Kconfig"
377source "net/mac80211/Kconfig"
378
379endif # WIRELESS
380
381source "net/rfkill/Kconfig"
382source "net/9p/Kconfig"
383source "net/caif/Kconfig"
384source "net/ceph/Kconfig"
385source "net/nfc/Kconfig"
386source "net/psample/Kconfig"
387source "net/ife/Kconfig"
388
389config LWTUNNEL
390 bool "Network light weight tunnels"
391 help
392 This feature provides an infrastructure to support light weight
393 tunnels like mpls. There is no netdevice associated with a light
394 weight tunnel endpoint. Tunnel encapsulation parameters are stored
395 with light weight tunnel state associated with fib routes.
396
397config LWTUNNEL_BPF
398 bool "Execute BPF program as route nexthop action"
399 depends on LWTUNNEL && INET
400 default y if LWTUNNEL=y
401 help
402 Allows to run BPF programs as a nexthop action following a route
403 lookup for incoming and outgoing packets.
404
405config DST_CACHE
406 bool
407 default n
408
409config GRO_CELLS
410 bool
411 default n
412
413config SOCK_VALIDATE_XMIT
414 bool
415
416config NET_SELFTESTS
417 def_tristate PHYLIB
418 depends on PHYLIB && INET
419
420config NET_SOCK_MSG
421 bool
422 default n
423 help
424 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
425 ULPs (upper layer modules, e.g. TLS) to process L7 application data
426 with the help of BPF programs.
427
428config NET_DEVLINK
429 bool
430 default n
431
432config PAGE_POOL
433 bool
434
435config PAGE_POOL_STATS
436 default n
437 bool "Page pool stats"
438 depends on PAGE_POOL
439 help
440 Enable page pool statistics to track page allocation and recycling
441 in page pools. This option incurs additional CPU cost in allocation
442 and recycle paths and additional memory cost to store the statistics.
443 These statistics are only available if this option is enabled and if
444 the driver using the page pool supports exporting this data.
445
446 If unsure, say N.
447
448config FAILOVER
449 tristate "Generic failover module"
450 help
451 The failover module provides a generic interface for paravirtual
452 drivers to register a netdev and a set of ops with a failover
453 instance. The ops are used as event handlers that get called to
454 handle netdev register/unregister/link change/name change events
455 on slave pci ethernet devices with the same mac address as the
456 failover netdev. This enables paravirtual drivers to use a
457 VF as an accelerated low latency datapath. It also allows live
458 migration of VMs with direct attached VFs by failing over to the
459 paravirtual datapath when the VF is unplugged.
460
461config ETHTOOL_NETLINK
462 bool "Netlink interface for ethtool"
463 default y
464 help
465 An alternative userspace interface for ethtool based on generic
466 netlink. It provides better extensibility and some new features,
467 e.g. notification messages.
468
469config NETDEV_ADDR_LIST_TEST
470 tristate "Unit tests for device address list"
471 default KUNIT_ALL_TESTS
472 depends on KUNIT
473
474endif # if NET