xref: /openbmc/linux/net/Kconfig (revision e7bae9bb) 
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/decnet/netfilter/Kconfig"
208source "net/bridge/netfilter/Kconfig"
209
210endif
211
212source "net/bpfilter/Kconfig"
213
214source "net/dccp/Kconfig"
215source "net/sctp/Kconfig"
216source "net/rds/Kconfig"
217source "net/tipc/Kconfig"
218source "net/atm/Kconfig"
219source "net/l2tp/Kconfig"
220source "net/802/Kconfig"
221source "net/bridge/Kconfig"
222source "net/dsa/Kconfig"
223source "net/8021q/Kconfig"
224source "net/decnet/Kconfig"
225source "net/llc/Kconfig"
226source "drivers/net/appletalk/Kconfig"
227source "net/x25/Kconfig"
228source "net/lapb/Kconfig"
229source "net/phonet/Kconfig"
230source "net/6lowpan/Kconfig"
231source "net/ieee802154/Kconfig"
232source "net/mac802154/Kconfig"
233source "net/sched/Kconfig"
234source "net/dcb/Kconfig"
235source "net/dns_resolver/Kconfig"
236source "net/batman-adv/Kconfig"
237source "net/openvswitch/Kconfig"
238source "net/vmw_vsock/Kconfig"
239source "net/netlink/Kconfig"
240source "net/mpls/Kconfig"
241source "net/nsh/Kconfig"
242source "net/hsr/Kconfig"
243source "net/switchdev/Kconfig"
244source "net/l3mdev/Kconfig"
245source "net/qrtr/Kconfig"
246source "net/ncsi/Kconfig"
247
248config RPS
249	bool
250	depends on SMP && SYSFS
251	default y
252
253config RFS_ACCEL
254	bool
255	depends on RPS
256	select CPU_RMAP
257	default y
258
259config XPS
260	bool
261	depends on SMP
262	default y
263
264config HWBM
265	bool
266
267config CGROUP_NET_PRIO
268	bool "Network priority cgroup"
269	depends on CGROUPS
270	select SOCK_CGROUP_DATA
271	help
272	  Cgroup subsystem for use in assigning processes to network priorities on
273	  a per-interface basis.
274
275config CGROUP_NET_CLASSID
276	bool "Network classid cgroup"
277	depends on CGROUPS
278	select SOCK_CGROUP_DATA
279	help
280	  Cgroup subsystem for use as general purpose socket classid marker that is
281	  being used in cls_cgroup and for netfilter matching.
282
283config NET_RX_BUSY_POLL
284	bool
285	default y
286
287config BQL
288	bool
289	depends on SYSFS
290	select DQL
291	default y
292
293config BPF_JIT
294	bool "enable BPF Just In Time compiler"
295	depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
296	depends on MODULES
297	help
298	  Berkeley Packet Filter filtering capabilities are normally handled
299	  by an interpreter. This option allows kernel to generate a native
300	  code when filter is loaded in memory. This should speedup
301	  packet sniffing (libpcap/tcpdump).
302
303	  Note, admin should enable this feature changing:
304	  /proc/sys/net/core/bpf_jit_enable
305	  /proc/sys/net/core/bpf_jit_harden   (optional)
306	  /proc/sys/net/core/bpf_jit_kallsyms (optional)
307
308config BPF_STREAM_PARSER
309	bool "enable BPF STREAM_PARSER"
310	depends on INET
311	depends on BPF_SYSCALL
312	depends on CGROUP_BPF
313	select STREAM_PARSER
314	select NET_SOCK_MSG
315	help
316	  Enabling this allows a stream parser to be used with
317	  BPF_MAP_TYPE_SOCKMAP.
318
319	  BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
320	  It can be used to enforce socket policy, implement socket redirects,
321	  etc.
322
323config NET_FLOW_LIMIT
324	bool
325	depends on RPS
326	default y
327	help
328	  The network stack has to drop packets when a receive processing CPU's
329	  backlog reaches netdev_max_backlog. If a few out of many active flows
330	  generate the vast majority of load, drop their traffic earlier to
331	  maintain capacity for the other flows. This feature provides servers
332	  with many clients some protection against DoS by a single (spoofed)
333	  flow that greatly exceeds average workload.
334
335menu "Network testing"
336
337config NET_PKTGEN
338	tristate "Packet Generator (USE WITH CAUTION)"
339	depends on INET && PROC_FS
340	help
341	  This module will inject preconfigured packets, at a configurable
342	  rate, out of a given interface.  It is used for network interface
343	  stress testing and performance analysis.  If you don't understand
344	  what was just said, you don't need it: say N.
345
346	  Documentation on how to use the packet generator can be found
347	  at <file:Documentation/networking/pktgen.rst>.
348
349	  To compile this code as a module, choose M here: the
350	  module will be called pktgen.
351
352config NET_DROP_MONITOR
353	tristate "Network packet drop alerting service"
354	depends on INET && TRACEPOINTS
355	help
356	  This feature provides an alerting service to userspace in the
357	  event that packets are discarded in the network stack.  Alerts
358	  are broadcast via netlink socket to any listening user space
359	  process.  If you don't need network drop alerts, or if you are ok
360	  just checking the various proc files and other utilities for
361	  drop statistics, say N here.
362
363endmenu
364
365endmenu
366
367source "net/ax25/Kconfig"
368source "net/can/Kconfig"
369source "net/bluetooth/Kconfig"
370source "net/rxrpc/Kconfig"
371source "net/kcm/Kconfig"
372source "net/strparser/Kconfig"
373
374config FIB_RULES
375	bool
376
377menuconfig WIRELESS
378	bool "Wireless"
379	depends on !S390
380	default y
381
382if WIRELESS
383
384source "net/wireless/Kconfig"
385source "net/mac80211/Kconfig"
386
387endif # WIRELESS
388
389source "net/wimax/Kconfig"
390
391source "net/rfkill/Kconfig"
392source "net/9p/Kconfig"
393source "net/caif/Kconfig"
394source "net/ceph/Kconfig"
395source "net/nfc/Kconfig"
396source "net/psample/Kconfig"
397source "net/ife/Kconfig"
398
399config LWTUNNEL
400	bool "Network light weight tunnels"
401	help
402	  This feature provides an infrastructure to support light weight
403	  tunnels like mpls. There is no netdevice associated with a light
404	  weight tunnel endpoint. Tunnel encapsulation parameters are stored
405	  with light weight tunnel state associated with fib routes.
406
407config LWTUNNEL_BPF
408	bool "Execute BPF program as route nexthop action"
409	depends on LWTUNNEL && INET
410	default y if LWTUNNEL=y
411	help
412	  Allows to run BPF programs as a nexthop action following a route
413	  lookup for incoming and outgoing packets.
414
415config DST_CACHE
416	bool
417	default n
418
419config GRO_CELLS
420	bool
421	default n
422
423config SOCK_VALIDATE_XMIT
424	bool
425
426config NET_SOCK_MSG
427	bool
428	default n
429	help
430	  The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
431	  ULPs (upper layer modules, e.g. TLS) to process L7 application data
432	  with the help of BPF programs.
433
434config NET_DEVLINK
435	bool
436	default n
437	imply NET_DROP_MONITOR
438
439config PAGE_POOL
440	bool
441
442config FAILOVER
443	tristate "Generic failover module"
444	help
445	  The failover module provides a generic interface for paravirtual
446	  drivers to register a netdev and a set of ops with a failover
447	  instance. The ops are used as event handlers that get called to
448	  handle netdev register/unregister/link change/name change events
449	  on slave pci ethernet devices with the same mac address as the
450	  failover netdev. This enables paravirtual drivers to use a
451	  VF as an accelerated low latency datapath. It also allows live
452	  migration of VMs with direct attached VFs by failing over to the
453	  paravirtual datapath when the VF is unplugged.
454
455config ETHTOOL_NETLINK
456	bool "Netlink interface for ethtool"
457	default y
458	help
459	  An alternative userspace interface for ethtool based on generic
460	  netlink. It provides better extensibility and some new features,
461	  e.g. notification messages.
462
463endif   # if NET
464
465# Used by archs to tell that they support BPF JIT compiler plus which flavour.
466# Only one of the two can be selected for a specific arch since eBPF JIT supersedes
467# the cBPF JIT.
468
469# Classic BPF JIT (cBPF)
470config HAVE_CBPF_JIT
471	bool
472
473# Extended BPF JIT (eBPF)
474config HAVE_EBPF_JIT
475	bool
476