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ec8f24b7 1# SPDX-License-Identifier: GPL-2.0-only
1da177e4
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2#
3# Network configuration
4#
5
031cf19e 6menuconfig NET
1da177e4 7 bool "Networking support"
e9cc8bdd 8 select NLATTR
4cd5773a 9 select GENERIC_NET_UTILS
f89b7755 10 select BPF
1da177e4
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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
d5950b43 15 other computer.
e446a276 16
d5950b43 17 If you are upgrading from an older kernel, you
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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
6a2e9b73 27if NET
1da177e4 28
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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
40b53d8a 38 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
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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
1cf51900
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49config NET_INGRESS
50 bool
51
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52config NET_EGRESS
53 bool
54
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55config SKB_EXTENSIONS
56 bool
57
6a2e9b73 58menu "Networking options"
1da177e4 59
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60source "net/packet/Kconfig"
61source "net/unix/Kconfig"
3c4d7559 62source "net/tls/Kconfig"
6a2e9b73 63source "net/xfrm/Kconfig"
2356f4cb 64source "net/iucv/Kconfig"
ac713874 65source "net/smc/Kconfig"
68e8b849 66source "net/xdp/Kconfig"
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67
68config INET
69 bool "TCP/IP networking"
70 ---help---
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
cf80efc2 73 your kernel by about 400 KB), since some programs (e.g. the X window
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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!).
77
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>.
81
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>.
87
88 Short answer: say Y.
89
6a2e9b73 90if INET
1da177e4 91source "net/ipv4/Kconfig"
1da177e4 92source "net/ipv6/Kconfig"
38c94377 93source "net/netlabel/Kconfig"
f870fa0b 94source "net/mptcp/Kconfig"
1da177e4 95
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96endif # if INET
97
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98config NETWORK_SECMARK
99 bool "Security Marking"
100 help
101 This enables security marking of network packets, similar
102 to nfmark, but designated for security purposes.
103 If you are unsure how to answer this question, answer N.
104
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105config NET_PTP_CLASSIFY
106 def_bool n
107
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108config NETWORK_PHY_TIMESTAMPING
109 bool "Timestamping in PHY devices"
408eccce 110 select NET_PTP_CLASSIFY
c1f19b51 111 help
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112 This allows timestamping of network packets by PHYs (or
113 other MII bus snooping devices) with hardware timestamping
114 capabilities. This option adds some overhead in the transmit
115 and receive paths.
c1f19b51
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116
117 If you are unsure how to answer this question, answer N.
118
1da177e4 119menuconfig NETFILTER
ef91fd52 120 bool "Network packet filtering framework (Netfilter)"
1da177e4
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121 ---help---
122 Netfilter is a framework for filtering and mangling network packets
123 that pass through your Linux box.
124
125 The most common use of packet filtering is to run your Linux box as
126 a firewall protecting a local network from the Internet. The type of
127 firewall provided by this kernel support is called a "packet
128 filter", which means that it can reject individual network packets
129 based on type, source, destination etc. The other kind of firewall,
130 a "proxy-based" one, is more secure but more intrusive and more
131 bothersome to set up; it inspects the network traffic much more
132 closely, modifies it and has knowledge about the higher level
133 protocols, which a packet filter lacks. Moreover, proxy-based
134 firewalls often require changes to the programs running on the local
135 clients. Proxy-based firewalls don't need support by the kernel, but
136 they are often combined with a packet filter, which only works if
137 you say Y here.
138
139 You should also say Y here if you intend to use your Linux box as
140 the gateway to the Internet for a local network of machines without
141 globally valid IP addresses. This is called "masquerading": if one
142 of the computers on your local network wants to send something to
143 the outside, your box can "masquerade" as that computer, i.e. it
144 forwards the traffic to the intended outside destination, but
145 modifies the packets to make it look like they came from the
146 firewall box itself. It works both ways: if the outside host
147 replies, the Linux box will silently forward the traffic to the
148 correct local computer. This way, the computers on your local net
149 are completely invisible to the outside world, even though they can
150 reach the outside and can receive replies. It is even possible to
151 run globally visible servers from within a masqueraded local network
152 using a mechanism called portforwarding. Masquerading is also often
153 called NAT (Network Address Translation).
154
155 Another use of Netfilter is in transparent proxying: if a machine on
156 the local network tries to connect to an outside host, your Linux
157 box can transparently forward the traffic to a local server,
158 typically a caching proxy server.
159
160 Yet another use of Netfilter is building a bridging firewall. Using
161 a bridge with Network packet filtering enabled makes iptables "see"
162 the bridged traffic. For filtering on the lower network and Ethernet
163 protocols over the bridge, use ebtables (under bridge netfilter
164 configuration).
165
166 Various modules exist for netfilter which replace the previous
167 masquerading (ipmasqadm), packet filtering (ipchains), transparent
168 proxying, and portforwarding mechanisms. Please see
169 <file:Documentation/Changes> under "iptables" for the location of
170 these packages.
171
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172if NETFILTER
173
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174config NETFILTER_ADVANCED
175 bool "Advanced netfilter configuration"
176 depends on NETFILTER
177 default y
178 help
179 If you say Y here you can select between all the netfilter modules.
692105b8 180 If you say N the more unusual ones will not be shown and the
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181 basic ones needed by most people will default to 'M'.
182
183 If unsure, say Y.
184
1da177e4 185config BRIDGE_NETFILTER
34666d46 186 tristate "Bridged IP/ARP packets filtering"
57f5877c 187 depends on BRIDGE
34666d46 188 depends on NETFILTER && INET
33b8e776 189 depends on NETFILTER_ADVANCED
2a95183a 190 select NETFILTER_FAMILY_BRIDGE
de8bda1d 191 select SKB_EXTENSIONS
34666d46 192 default m
1da177e4
LT
193 ---help---
194 Enabling this option will let arptables resp. iptables see bridged
195 ARP resp. IP traffic. If you want a bridging firewall, you probably
196 want this option enabled.
197 Enabling or disabling this option doesn't enable or disable
198 ebtables.
199
200 If unsure, say N.
201
9eb0eec7 202source "net/netfilter/Kconfig"
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203source "net/ipv4/netfilter/Kconfig"
204source "net/ipv6/netfilter/Kconfig"
205source "net/decnet/netfilter/Kconfig"
206source "net/bridge/netfilter/Kconfig"
207
208endif
209
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AS
210source "net/bpfilter/Kconfig"
211
7c657876 212source "net/dccp/Kconfig"
1da177e4 213source "net/sctp/Kconfig"
fe17f84f 214source "net/rds/Kconfig"
1e63e681 215source "net/tipc/Kconfig"
6a2e9b73 216source "net/atm/Kconfig"
fd558d18 217source "net/l2tp/Kconfig"
a19800d7 218source "net/802/Kconfig"
6a2e9b73 219source "net/bridge/Kconfig"
91da11f8 220source "net/dsa/Kconfig"
6a2e9b73 221source "net/8021q/Kconfig"
1da177e4 222source "net/decnet/Kconfig"
1da177e4 223source "net/llc/Kconfig"
1da177e4 224source "drivers/net/appletalk/Kconfig"
6a2e9b73
SR
225source "net/x25/Kconfig"
226source "net/lapb/Kconfig"
5075138d 227source "net/phonet/Kconfig"
2c6bed7c 228source "net/6lowpan/Kconfig"
9ec76716 229source "net/ieee802154/Kconfig"
1010f540 230source "net/mac802154/Kconfig"
1da177e4 231source "net/sched/Kconfig"
2f90b865 232source "net/dcb/Kconfig"
1a4240f4 233source "net/dns_resolver/Kconfig"
c6c8fea2 234source "net/batman-adv/Kconfig"
ccb1352e 235source "net/openvswitch/Kconfig"
d021c344 236source "net/vmw_vsock/Kconfig"
eaaa3139 237source "net/netlink/Kconfig"
0d89d203 238source "net/mpls/Kconfig"
c411ed85 239source "net/nsh/Kconfig"
f421436a 240source "net/hsr/Kconfig"
007f790c 241source "net/switchdev/Kconfig"
1b69c6d0 242source "net/l3mdev/Kconfig"
bdabad3e 243source "net/qrtr/Kconfig"
2d283bdd 244source "net/ncsi/Kconfig"
1da177e4 245
df334545 246config RPS
6341e62b 247 bool
044c8d4b 248 depends on SMP && SYSFS
df334545
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249 default y
250
c445477d 251config RFS_ACCEL
6341e62b 252 bool
0244ad00 253 depends on RPS
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254 select CPU_RMAP
255 default y
256
bf264145 257config XPS
6341e62b 258 bool
044c8d4b 259 depends on SMP
bf264145
TH
260 default y
261
8cb2d8bf 262config HWBM
43da1411 263 bool
8cb2d8bf 264
86f8515f 265config CGROUP_NET_PRIO
af636337 266 bool "Network priority cgroup"
5bc1421e 267 depends on CGROUPS
2a56a1fe 268 select SOCK_CGROUP_DATA
5bc1421e
NH
269 ---help---
270 Cgroup subsystem for use in assigning processes to network priorities on
86f8515f 271 a per-interface basis.
5bc1421e 272
fe1217c4 273config CGROUP_NET_CLASSID
6341e62b 274 bool "Network classid cgroup"
fe1217c4 275 depends on CGROUPS
2a56a1fe 276 select SOCK_CGROUP_DATA
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DB
277 ---help---
278 Cgroup subsystem for use as general purpose socket classid marker that is
279 being used in cls_cgroup and for netfilter matching.
280
e0d1095a 281config NET_RX_BUSY_POLL
6341e62b 282 bool
89bf1b5a 283 default y
06021292 284
114cf580 285config BQL
6341e62b 286 bool
114cf580
TH
287 depends on SYSFS
288 select DQL
289 default y
290
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291config BPF_JIT
292 bool "enable BPF Just In Time compiler"
6077776b 293 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
b6202f97 294 depends on MODULES
0a14842f
ED
295 ---help---
296 Berkeley Packet Filter filtering capabilities are normally handled
297 by an interpreter. This option allows kernel to generate a native
298 code when filter is loaded in memory. This should speedup
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DB
299 packet sniffing (libpcap/tcpdump).
300
301 Note, admin should enable this feature changing:
302 /proc/sys/net/core/bpf_jit_enable
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303 /proc/sys/net/core/bpf_jit_harden (optional)
304 /proc/sys/net/core/bpf_jit_kallsyms (optional)
0a14842f 305
08848246
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306config BPF_STREAM_PARSER
307 bool "enable BPF STREAM_PARSER"
604326b4 308 depends on INET
08848246 309 depends on BPF_SYSCALL
604326b4 310 depends on CGROUP_BPF
08848246 311 select STREAM_PARSER
604326b4 312 select NET_SOCK_MSG
08848246 313 ---help---
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314 Enabling this allows a stream parser to be used with
315 BPF_MAP_TYPE_SOCKMAP.
08848246 316
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317 BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
318 It can be used to enforce socket policy, implement socket redirects,
319 etc.
08848246 320
99bbc707 321config NET_FLOW_LIMIT
6341e62b 322 bool
99bbc707
WB
323 depends on RPS
324 default y
325 ---help---
326 The network stack has to drop packets when a receive processing CPU's
327 backlog reaches netdev_max_backlog. If a few out of many active flows
328 generate the vast majority of load, drop their traffic earlier to
329 maintain capacity for the other flows. This feature provides servers
330 with many clients some protection against DoS by a single (spoofed)
331 flow that greatly exceeds average workload.
332
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333menu "Network testing"
334
335config NET_PKTGEN
336 tristate "Packet Generator (USE WITH CAUTION)"
ffd756b3 337 depends on INET && PROC_FS
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338 ---help---
339 This module will inject preconfigured packets, at a configurable
340 rate, out of a given interface. It is used for network interface
341 stress testing and performance analysis. If you don't understand
342 what was just said, you don't need it: say N.
343
344 Documentation on how to use the packet generator can be found
345 at <file:Documentation/networking/pktgen.txt>.
346
347 To compile this code as a module, choose M here: the
348 module will be called pktgen.
349
273ae44b 350config NET_DROP_MONITOR
cad456d5 351 tristate "Network packet drop alerting service"
911f8635 352 depends on INET && TRACEPOINTS
273ae44b 353 ---help---
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354 This feature provides an alerting service to userspace in the
355 event that packets are discarded in the network stack. Alerts
356 are broadcast via netlink socket to any listening user space
357 process. If you don't need network drop alerts, or if you are ok
358 just checking the various proc files and other utilities for
359 drop statistics, say N here.
273ae44b 360
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361endmenu
362
363endmenu
364
1da177e4 365source "net/ax25/Kconfig"
0d66548a 366source "net/can/Kconfig"
1da177e4 367source "net/bluetooth/Kconfig"
17926a79 368source "net/rxrpc/Kconfig"
ab7ac4eb 369source "net/kcm/Kconfig"
43a0c675 370source "net/strparser/Kconfig"
d86b5e0e 371
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372config FIB_RULES
373 bool
374
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375menuconfig WIRELESS
376 bool "Wireless"
f54bfc0e 377 depends on !S390
5442060c
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378 default y
379
380if WIRELESS
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381
382source "net/wireless/Kconfig"
f0706e82 383source "net/mac80211/Kconfig"
2a5e1c0e 384
5442060c 385endif # WIRELESS
2a5e1c0e 386
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IPG
387source "net/wimax/Kconfig"
388
cf4328cd 389source "net/rfkill/Kconfig"
bd238fb4 390source "net/9p/Kconfig"
3908c690 391source "net/caif/Kconfig"
3d14c5d2 392source "net/ceph/Kconfig"
3e256b8f 393source "net/nfc/Kconfig"
6ae0a628 394source "net/psample/Kconfig"
1ce84604 395source "net/ife/Kconfig"
3908c690 396
499a2425
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397config LWTUNNEL
398 bool "Network light weight tunnels"
399 ---help---
400 This feature provides an infrastructure to support light weight
401 tunnels like mpls. There is no netdevice associated with a light
402 weight tunnel endpoint. Tunnel encapsulation parameters are stored
403 with light weight tunnel state associated with fib routes.
cf4328cd 404
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405config LWTUNNEL_BPF
406 bool "Execute BPF program as route nexthop action"
b251f9f6 407 depends on LWTUNNEL && INET
3a0af8fd
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408 default y if LWTUNNEL=y
409 ---help---
410 Allows to run BPF programs as a nexthop action following a route
411 lookup for incoming and outgoing packets.
412
911362c7 413config DST_CACHE
9b246841 414 bool
911362c7
PA
415 default n
416
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417config GRO_CELLS
418 bool
419 default n
420
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421config SOCK_VALIDATE_XMIT
422 bool
423
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424config NET_SOCK_MSG
425 bool
426 default n
427 help
428 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
429 ULPs (upper layer modules, e.g. TLS) to process L7 application data
430 with the help of BPF programs.
431
bfcd3a46 432config NET_DEVLINK
f6b19b35
JP
433 bool
434 default n
0f420b6c 435 imply NET_DROP_MONITOR
bfcd3a46 436
ff7d6b27 437config PAGE_POOL
43da1411 438 bool
ff7d6b27 439
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SS
440config FAILOVER
441 tristate "Generic failover module"
442 help
443 The failover module provides a generic interface for paravirtual
444 drivers to register a netdev and a set of ops with a failover
445 instance. The ops are used as event handlers that get called to
446 handle netdev register/unregister/link change/name change events
447 on slave pci ethernet devices with the same mac address as the
448 failover netdev. This enables paravirtual drivers to use a
449 VF as an accelerated low latency datapath. It also allows live
450 migration of VMs with direct attached VFs by failing over to the
451 paravirtual datapath when the VF is unplugged.
452
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453config ETHTOOL_NETLINK
454 bool "Netlink interface for ethtool"
455 default y
456 help
457 An alternative userspace interface for ethtool based on generic
458 netlink. It provides better extensibility and some new features,
459 e.g. notification messages.
460
6a2e9b73 461endif # if NET
e47b65b0 462
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463# Used by archs to tell that they support BPF JIT compiler plus which flavour.
464# Only one of the two can be selected for a specific arch since eBPF JIT supersedes
465# the cBPF JIT.
466
467# Classic BPF JIT (cBPF)
468config HAVE_CBPF_JIT
469 bool
470
471# Extended BPF JIT (eBPF)
472config HAVE_EBPF_JIT
e47b65b0 473 bool